U.S. patent number RE46,392 [Application Number 14/457,095] was granted by the patent office on 2017-05-02 for wireless multi-charger system and controlling method thereof.
This patent grant is currently assigned to Intel Corporation. The grantee listed for this patent is Intel Corporation. Invention is credited to Chun-Kil Jung.
United States Patent |
RE46,392 |
Jung |
May 2, 2017 |
Wireless multi-charger system and controlling method thereof
Abstract
Disclosed are a wireless multi-charger system capable of saving
the total charging time of a large number of wireless power
transmission devices since one wireless multi-power transmission
device includes a plurality of the wireless power transmission
devices so that a large number of the wireless power transmission
devices can be charged with electricity, and preventing the damage
of the wireless power transmission devices and the wireless
multi-power transmission device although foreign substances are put
on charger blocks that are not charged. The wireless multi-charger
system (A) according to the present invention includes an external
body formed as a wireless charger case 11, wherein the wireless
charger case 11 has a wireless charger table 12 formed in an upper
surface thereof, wherein the wireless charger table 12 has a
plurality of charger blocks 14, each of which includes a primary
charging core 13, wherein the full-bridge resonant converter 22 is
present in a plural form and coupled respectively to a plurality of
the charger blocks 14, wherein a multi-gate driver module 23 is
provided to transmit a converted power signal to each of a
plurality of the full-bridge resonant converters 22 under the
control of the central controller 21, and wherein a reception
signal processor module 24 coupled to a plurality of the charger
blocks 14 to process a signal transmitted from the wireless power
transmission device 30 and supply the processed signal to the
central controller 21 is provided.
Inventors: |
Jung; Chun-Kil (Seoul,
KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
Intel Corporation |
Santa Clara |
CA |
US |
|
|
Assignee: |
Intel Corporation (Santa Clara,
CA)
|
Family
ID: |
40349936 |
Appl.
No.: |
14/457,095 |
Filed: |
August 11, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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13755931 |
Jan 31, 2013 |
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Reissue of: |
12166483 |
Jul 2, 2008 |
8102147 |
Jan 24, 2012 |
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Reissue of: |
12166483 |
Jul 2, 2008 |
8102147 |
Jan 24, 2012 |
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Foreign Application Priority Data
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Nov 30, 2007 [KR] |
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10-2007-0123749 |
Nov 30, 2007 [KR] |
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10-2007-0123751 |
Nov 30, 2007 [KR] |
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10-2007-0123752 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H02J
50/12 (20160201); H04B 5/0037 (20130101); H02J
7/025 (20130101); H02J 7/027 (20130101); H02J
50/40 (20160201); H02J 50/90 (20160201); H02J
7/0027 (20130101); H02J 50/80 (20160201); H02J
50/60 (20160201) |
Current International
Class: |
H02J
7/00 (20060101); H02J 7/02 (20160101); H01F
17/00 (20060101); H02M 3/335 (20060101) |
Field of
Search: |
;320/106,108,132,111,114,115 ;323/363 ;363/17 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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64-570006 |
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JP |
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09-019078 |
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JP |
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2003-224937 |
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Aug 2003 |
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JP |
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2004-222457 |
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Aug 2004 |
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JP |
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2005-006440 |
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Jan 2005 |
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JP |
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2006-314181 |
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Nov 2006 |
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JP |
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2007-295677 |
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Nov 2007 |
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JP |
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100554889 |
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Mar 2005 |
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KR |
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100554889 |
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Mar 2005 |
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KR |
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10200554816 |
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Jun 2005 |
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KR |
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10200554816 |
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Jun 2005 |
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KR |
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1020070014804 |
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Feb 2007 |
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KR |
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1020070014804 |
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Feb 2007 |
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KR |
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WO 2006/001557 |
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Jan 2006 |
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WO |
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WO 2006/101285 |
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Sep 2006 |
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WO |
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WO 2007/089086 |
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Sep 2007 |
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WO |
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Other References
Office Action dated Sep. 25, 2014, issued to the corresponding U.S.
Appl. No. 13/755,931. cited by applicant .
U.S. Appl. No. 12/166,483, filed Jul. 2, 2008, Chun-Kil Jung,
Spacon Co., Ltd. cited by applicant .
U.S. Appl. No. 13/755,931, filed Jan. 31, 2013, Chun-Kil Jung,
Spacon Co., Ltd. cited by applicant .
U.S. Appl. No. 13/875,748, filed May 2, 2013, Chun-Kil Jung, Spacon
Co., Ltd. cited by applicant .
Office Action issued by the USPTO on Sep. 12, 2013, for the
corresponding U.S. Appl. No. 13/755,931. cited by applicant .
Office Action issued by the USPTO on Sep. 12, 2013, for the
corresponding U.S. Appl. No. 13/875,748. cited by applicant .
European Search Report issued by the EPO on Aug. 27, 2014, for the
corresponding EP Patent Application No. 13186429.0. cited by
applicant .
European Search Report, EP No. 08159822, mailed on Jan. 28, 2013, 2
pages. cited by applicant.
|
Primary Examiner: Nguyen; Linh M
Attorney, Agent or Firm: International IP Law Group,
P.L.L.C.
Parent Case Text
.Iadd.CROSS REFERENCE TO RELATED APPLICATIONS .Iaddend.
.Iadd.Notice: More than one reissue application has been filed for
the reissue of U.S. Pat. No. 8,102,147; the reissue applications
are application Ser. No. 14/457,095 (the present application), Ser.
Nos. 13/755,931, and 15/197,171, the present application being a
continuation reissue application of U.S. patent application Ser.
No. 13/755,931, filed Jan. 31, 2013, which is a reissue application
of U.S. patent application Ser. No. 12/166,483, filed Jul. 2, 2008,
now patented as U.S. Pat. No. 8,102,147, issued on Jan. 24, 2012,
which claims foreign priority of Korean Application Nos.
10-2007-01237 49 filed Nov. 30, 2007, 10-2007-0123751, filed Nov.
30, 2007 and 10-2007-0123752 filed Nov. 30, 2007, all in the Korean
Intellectual Property Office. .Iaddend.
Claims
The invention claimed is:
.[.1. A wireless multi-charger system comprising a wireless
multi-power transmission device for transmitting a power signal to
a wireless power transmission device in a wireless manner, wherein
the wireless multi-power transmission device include a wireless
charger case formed as an external body, the wireless charger case
having a full-bridge resonant converter and a central controller
mounted thereinside to transmit a power signal to the wireless
power transmission device in a wireless manner, wherein the
wireless charger case has a wireless charger table formed in an
upper surface thereof, wherein the wireless charger table has a
plurality of charger blocks, each of which includes a primary
charging core, wherein the full-bridge resonant converter is
present in a plural form and coupled respectively to a plurality of
the charger blocks, wherein a multi-gate driver module is provided
to transmit a converted power signal to each of a plurality of the
full-bridge resonant converters under the control of the central
controller, wherein a reception signal processor module coupled to
a plurality of the charger blocks to process a signal transmitted
from the wireless power transmission device and supply the
processed signal to the central controller is provided, and wherein
the central controller comprises: a power supply block coupled to
the power supply unit to supply a power source of the wireless
multi-power transmission device; a signal output block for
outputting a display signal into an LCD panel and a charging LED; a
gate output signal processor block coupled to the multi-gate driver
module to transmit a power signal transmitted from the primary
charging core; a received signal processor block coupled to one
side of the primary charging core for processing a signal
transmitted from the reception signal processor module for
processing a signal transmitted from the wireless power
transmission device; and a main controller for controlling the
power supply block, the signal output block, the gate output signal
processor block and the received signal processor block..].
.[.2. The wireless multi-charger system according to claim 1,
wherein the central controller controls the request for data
information on charging capacity to the wireless power transmission
device, receives data of the information on charging capacity and
data of the power signal voltage transmitted from the wireless
power transmission device to determine voltage data of the
transmitted power signal, performs an arithmetic operation on the
frequency of the power signal to compensate for a transmitted power
relative to the voltage data of the power signal of the determined
wireless power transmission device, and controls the transmission
of the power signal as the compensated frequency to transmit a
compensated power signal to the wireless power transmission
device..].
.[.3. A method for controlling a wireless multi-charger system as
defined in claim 1, comprising: transmitting a power signal via the
primary charging core from wireless multi-power transmission device
of the wireless multi-charger system in every cycle, the power
signal including a call signal for calling a native ID value of the
wireless power transmission device, and waiting for the receipt of
a response signal for the power signal; determining the presence of
an object by checking a detected detection signal according to load
modulation in the primary charging core of one of the charger
blocks and determining whether the detected detection signal is a
normal signal; determining whether a native ID signal of the
wireless power transmission device is received by analyzing the
detected reception signal; transmitting a fully charged
transmission power from the primary charging core of the
corresponding charger block via the multi-gate driver module when
the received native ID signal is determined to be a native ID
transmitted from the wireless power transmission device; requesting
information on the charging state to the wireless power
transmission device and adjusting a charging level according to the
charging information of the wireless power transmission device;
displaying a fully charged state in the LCD panel or the charging
LED corresponding to the corresponding charger block and stopping a
charging operation when the information on the fully charged state
is received from the wireless power transmission device..].
.[.4. The method for controlling the wireless multi-charger system
according to claim 3, wherein the object detection step comprises:
converting a plurality of the charger blocks into a foreign
substance detection mode when a detection signal detected through
the corresponding primary charging core and the reception signal
processor module according to the load modulation generated by
objects is not a normal signal, displays a foreign substance error
in the LCD panel or the charging LED when the detected foreign
substance is a metal or electronic equipment, and stops a charging
operation on the corresponding charger block..].
.[.5. The method for controlling the wireless multi-charger system
according to claim 3, wherein the charging control step comprises:
requesting data information on the charging capacity to the
wireless power transmission device; receiving data information on
the charging capacity and the voltage data of the power signal
transmitted from the wireless power transmission device;
determining the voltage data of the power signal transmitted from
the wireless power transmission device; performing an arithmetic
operation on a frequency of the power signal to compensate for the
transmitted power for the voltage data of the power signal
transmitted from the wireless power transmission device;
transmitting a power signal as a compensated frequency to transmit
a compensated power signal to the wireless power transmission
device..].
.[.6. A method for controlling the wireless multi-charger system as
defined in claim 2, comprising: transmitting a power signal via the
primary charging core from the wireless multi-power transmission
device of the wireless multi-charger system in every cycle, the
power signal including a call signal for calling a native ID value
of the wireless power transmission device, and waiting for the
receipt of a response signal for the power signal; determining the
presence of an object by checking a detected detection signal
according to load modulation in the primary charging core of one of
the charger blocks and determining whether the detected detection
signal is a normal signal; determining whether a native ID signal
of the wireless power transmission device is received by analyzing
the detected reception signal; transmitting a fully charged
transmission power from the primary charging core of the
corresponding charger block via the multi-gate driver module when
the received native ID signal is determined to be a native ID
transmitted from the wireless power transmission device; requesting
information on the charging state to the wireless power
transmission device and adjusting a charging level according to the
charging information of the wireless power transmission device;
displaying a fully charged state in an LCD panel or a charging LED
corresponding to the corresponding charger block and stopping a
charging operation when the information on the fully charged state
is received from the wireless power transmission device..].
.[.7. The wireless multi-charger system according to claim 1,
wherein the LCD panel is configured to display a total charging
state of the plurality of the charger blocks, and the charging LED
is configured to display a charging state of each of the plurality
of the charger blocks..].
.[.8. A wireless multi-charger system comprising a wireless
multi-power transmission device for transmitting a power signal to
a wireless power transmission device in a wireless manner, wherein
the wireless multi-power transmission device include a wireless
charger case formed as an external body, the wireless charger case
having a full-bridge resonant converter and a central controller
mounted thereinside to transmit a power signal to the wireless
power transmission device in a wireless manner, wherein the
wireless charger case has a wireless charger table formed in an
upper surface thereof, wherein the wireless charger table has a
plurality of charger blocks, each of which includes a primary
charging core, wherein the full-bridge resonant converter is
present in a plural form and coupled respectively to a plurality of
the charger blocks, wherein a multi-gate driver module is provided
to transmit a converted power signal to each of a plurality of the
full-bridge resonant converters under the control of the central
controller, wherein a reception signal processor module coupled to
a plurality of the charger blocks to process a signal transmitted
from the wireless power transmission device and supply the
processed signal to the central controller is provided, and wherein
the wireless power transmission device comprises: a secondary
charging core for transmitting an induced electric current from the
magnetic field to correspond to the primary charging core of the
wireless multi-power transmission device; a rectifier block coupled
to the secondary charging core to rectify the induced electric
current; a smoothing filter block coupled to the rectifier block to
filter an electric current; a charger IC block coupled to the
smoothing filter block to charge a power source in the battery
cell; a protection circuit module block provided between the
charger IC block and the battery cell to detect an electric current
charged in the battery cell and transmit information on a charging
state of the battery cell to the power receiver controller; a
positive-voltage regulator block provided to supply a power source
to the power receiver controller; and a power receiver controller
for controlling the rectifier block, the smoothing filter block,
the charger IC block, the protection circuit module block and the
positive-voltage regulator block..].
.[.9. The wireless multi-charger system according to claim 8,
wherein the power receiver controller comprises: a power signal
processor block coupled to the smoothing filter block to process a
transmission signal for the data information on the power signal
received from the wireless power transmission device; a charge
signal processor block coupled to the charger IC block and the
protection circuit module block to process a transmission signal
for the data information on the charging capacity and charging
state of the battery cell; a signal processor block for processing
information on the charging capacity and data information on the
native ID that are transmitted to the wireless multi-power
transmission device under the control of the device controller; a
device memory unit for storing data information on the native ID,
temporally storing the data information of the charging capacity
and the charging state transmitted from the protection circuit
module block and the charger IC block and storing the data
transmitted from the wireless multi-power transmission device; and
a device controller..].
.[.10. The wireless multi-charger system according to claim 9,
wherein the main controller of the wireless multi-power
transmission device controls the transmission of a native code
signal for the respective charger blocks in addition to the charge
power signal to the charger blocks that are on charge, wherein the
device controller analyzes the native code signal for the
corresponding charger block transmitted from the wireless
multi-power transmission device, and wherein the device memory unit
stores a data value of the native code signal for the corresponding
charger block transmitted from the device controller..].
.[.11. The wireless multi-charger system according to claim 9,
wherein the device controller controls transmission of a data value
to the wireless multi-power transmission device, the data value
including a voltage value of the power signal received for the
received request signal from the wireless multi-power transmission
device..].
.Iadd.12. A wireless multi-power transmission device for detecting
a foreign substance, the wireless multi-power transmission device
comprising: a plurality of charger blocks each of which includes a
primary charging core for generating a magnetic field to perform a
wireless charging operation; and a main controller to: initiate a
standby mode at the plurality of charger blocks, wherein during the
standby mode a power signal is to be transmitted via the primary
charging core of each charger block of the plurality of charger
blocks; and convert a first charger block on which a secondary
charging core of a wireless device is detected into a charge mode
and convert a second charger block on which no secondary charging
core of the wireless device is detected into a foreign substance
detection mode in response to detecting a presence of the wireless
device at both the first charger block and the second charger
block..Iaddend.
.Iadd.13. The wireless multi-power transmission device in
accordance with claim 12, wherein the main controller is to stop an
operation of the second charger block during the foreign substance
detection mode..Iaddend.
.Iadd.14. The wireless multi-power transmission device in
accordance with claim 13, further comprising: a reception signal
processor module coupled to the plurality of charger blocks to
detect a detection signal received through the primary charging
core, wherein the main controller is to detect a foreign substance
if the detection signal is not a normal signal..Iaddend.
.Iadd.15. The wireless multi-power transmission device in
accordance with claim 14, wherein the reception signal processor
module is to detect the detection signal according to a load
modulation..Iaddend.
.Iadd.16. The wireless multi-power transmission device in
accordance with claim 12, wherein other charger blocks on which a
secondary charging core of other wireless device is positioned
perform the wireless charging operation..Iaddend.
.Iadd.17. The wireless multi-power transmission device in
accordance with claim 12, further comprising: an LCD panel to
display a foreign substance error in the second charger
block..Iaddend.
.Iadd.18. The wireless multi-power transmission device in
accordance with claim 13, wherein the second charger block is to be
converted into a standby mode in response to detecting a removal of
the device from the second charger block and an input of a re-start
signal into the second charger block..Iaddend.
.Iadd.19. A method for detecting a foreign substance by a wireless
multi-power transmission device, the method comprising: generating
a magnetic field to perform a wireless charging operation at a
plurality of charger blocks, each of which includes a primary
charging core; initiating a standby mode at the plurality of
charger blocks, wherein during the standby mode a power signal is
to be transmitted via the primary charging core of each charger
block of the plurality of charger blocks; and converting a first
charger block on which a secondary charging core of a wireless
device is detected into a charge mode and converting a second
charger block on which no secondary charging core of the wireless
device is detected into a foreign substance detection mode in
response to detecting a presence of the wireless device at both the
first charger block and the second charger block..Iaddend.
.Iadd.20. The method in accordance with claim 19, further
comprising: stopping an operation of the second charger block
during the foreign substance detection mode..Iaddend.
.Iadd.21. The method in accordance with claim 20, further
comprising: detecting a detection signal received through the
primary charging core, wherein a foreign substance is detected if
the detection signal is not a normal signal..Iaddend.
.Iadd.22. The method in accordance with claim 21, wherein the
detection signal is detected according to a load
modulation..Iaddend.
.Iadd.23. The method in accordance with claim 19, wherein the
wireless charging operation is performed at other charger blocks on
which a secondary charging core of other wireless device is
positioned..Iaddend.
.Iadd.24. The method in accordance with claim 19, further
comprising: displaying a foreign substance error in the second
charger block..Iaddend.
.Iadd.25. The method in accordance with claim 20, wherein when the
operation of the second charger block is stopped, the second
charger block is in a standby mode until a restart signal is input
into the second charger block..Iaddend.
Description
TECHNICAL FIELD
The present invention relates to a, and more particularly to a
wireless charger system, and more particularly to a wireless
multi-charger system capable of saving the total charging time of a
large number of wireless power transmission devices since one
wireless multi-power transmission device includes a plurality of
the wireless power transmission devices so that a large number of
the wireless power transmission devices can be charged with
electricity, and preventing the damage of the wireless power
transmission devices and the wireless multi-power transmission
device although foreign substances are put on charger blocks that
are not charged.
BACKGROUND ART
Generally, since portable wireless power transmission devices such
as mobile phones, PDA, PMP, DMB terminals, MP3 or notebook
computers are not supplied with a conventional household power
source since users use the portable wireless power transmission
devices while moving around. Therefore, it is necessary to install
disposable batteries or rechargeable batteries in the portable
wireless power transmission devices.
However, as a charger for charging electricity in a battery pack
for these wireless power transmission devices, there is a terminal
supply system in which electricity is received from a conventional
power source and a power source is supplied to a battery pack via
power supply lines and a power supply terminal. However, where the
battery pack is attached/detached to/from the charger when a power
source is supplied to this terminal supply system, an instant
discharge phenomenon occurs due to the different potential
difference of terminals disposed in both sides of the battery pack.
Therefore, the battery pack has an increasing possibility to start
fires as foreign substances are accumulated in the terminals. Also,
since the terminals are directly exposed to the air, the life span
and performances of the charger and the battery pack may be
deteriorated, for example, due to the spontaneous discharge in the
presence of moisture or dusts.
In order to solve these problems regarding the terminal supply
system, there has been developed a wireless charger. That is to
say, this conventional wireless charger is charged by a secondary
coil of the battery when a portable terminal block having a battery
pack mounted inside is disposed upwardly in a primary coil of
wireless charger. That is to say, an induced electromotive force is
generated in the secondary coil by the magnetic field formed in the
primary coil, and electricity induced from the induced
electromotive force is charged in the secondary coil.
However, these conventional wireless chargers have no practical use
since it is possible only to supply a power to a portable terminal
block, but they have difficulty in use for other applications.
Furthermore, the wireless charger may be damaged due to the
increased loss of power in the primary coil with the changes in the
magnetic field when metals are disposed adjacent to the magnetic
field generated in the primary coil.
DISCLOSURE
Technical Problem
Accordingly, the present invention is designed to solve the above
problems, and therefore it is an object of the present invention to
provide a wireless multi-charger system capable of saving the total
charging time of a large number of wireless power transmission
devices since one wireless multi-power transmission device includes
a plurality of the wireless power transmission devices so that a
large number of the wireless power transmission devices can be
charged with electricity.
Also, it is another object of the present invention to provide a
wireless multi-charger system capable of preventing the damage of
the wireless power transmission devices and the wireless
multi-power transmission device by stopping the power transmission
when foreign substances such as metals are put on charger blocks
that are not charged.
Furthermore, it is still another object of the present invention to
provide a wireless multi-charger system capable of improving the
charging efficiency by stably performing a continuous charging
operation although the current wireless power transmission device
that is on charge is touched to charge a new wireless power
transmission device.
Technical Solution
In order to accomplish the above object, one embodiment of the
present invention provides a wireless multi-charger system (A)
including a wireless multi-power transmission device 10 for
transmitting a power signal to a wireless power transmission device
30 in a wireless manner, wherein the wireless multi-power
transmission device 10 include a wireless charger case 11 formed as
an external body, the wireless charger case 11 having a full-bridge
resonant converter 22 and a central controller 21 mounted
thereinside to transmit a power signal to the wireless power
transmission device 30 in a wireless manner, wherein the wireless
charger case 11 has a wireless charger table 12 formed in an upper
surface thereof, wherein the wireless charger table 12 has a
plurality of charger blocks 14, each of which includes a primary
charging core 13, wherein the full-bridge resonant converter 22 is
present in a plural form and coupled respectively to a plurality of
the charger blocks 14, wherein a multi-gate driver module 23 is
provided to transmit a converted power signal to each of a
plurality of the full-bridge resonant converters 22 under the
control of the central controller 21, and wherein a reception
signal processor module 24 coupled to a plurality of the charger
blocks 14 to process a signal transmitted from the wireless power
transmission device 30 and supply the processed signal to the
central controller 21 is provided.
In this case, the wireless charger case 11 may have a power-on/off
switch 151; an input panel 152 for inputting a signal; and a LCD
panel 153 and a charging LED 154 for displaying a charging state of
the wireless charger table 12 and a plurality of the charger blocks
14 and the wireless power transmission device 30, all of which are
formed in the front thereof, and may include a power supply unit 25
formed thereinside.
Also, the central controller 21 may includes a power supply block
211 coupled to the power supply unit 25 to supply a power source of
the wireless multi-power transmission device 10; a signal output
block 212 for outputting a display signal into the LCD panel 153
and the charging LED 154; a gate output signal processor block 213
coupled to the multi-gate driver module 23 to transmit a power
signal transmitted from the primary charging core 13; a received
signal processor block 214 coupled to one side of the primary
charging core 13 for processing a signal transmitted from the
reception signal processor module 24 for processing a signal
transmitted from the wireless power transmission device 30; and a
main controller 210 for controlling the power supply block 211, the
signal output block 212, the gate output signal processor block 213
and the received signal processor block 214.
In addition, the central controller 21 may control the request for
data information on charging capacity to the wireless device 30,
receive data of the information on charging capacity and data of
the power signal voltage transmitted from the wireless device 30 to
determine voltage data of the transmitted power signal, perform an
arithmetic operation on the frequency of the power signal to
compensate for a transmitted power relative to the voltage data of
the power signal of the determined wireless device 30, and control
the transmission of the power signal as the compensated frequency
to transmit a compensated power signal to the wireless device
30.
Also, the wireless power transmission device 30 may include a
secondary charging core 32 for transmitting an induced electric
current from the magnetic field to correspond to the primary
charging core 13 of the wireless multi-power transmission device
10; a rectifier block 33 coupled to the secondary charging core 32
to rectify the induced electric current; a smoothing filter block
34 coupled to the rectifier block 33 to filter an electric current;
a charger IC block 36 coupled to the smoothing filter block 34 to
charge a power source in the battery cell 35; a protection circuit
module block 37 provided between the charger IC block 36 and the
battery cell 35 to detect an electric current charged in the
battery cell 35 and transmit information on a charging state of the
battery cell 35 to the power receiver controller 39; a
positive-voltage regulator block 38 provided to supply a power
source to the power receiver controller 39; and a power receiver
controller 39 for controlling the rectifier block 33, the smoothing
filter block 34, the charger IC block 36, the protection circuit
module block 37 and the positive-voltage regulator block 38.
In addition, the power receiver controller 39 may include a power
signal processor block 393 coupled to the smoothing Filter block 34
to process a transmission signal for the data information on the
power signal received from the wireless power transmission device
10; a charge signal processor block 394 coupled to the charger IC
block 36 and the protection circuit module block 37 to process a
transmission signal for the data information on the charging
capacity and charging state of the battery cell 35; a signal
processor block 392 for processing information on the charging
capacity and data information on the native ID that are transmitted
to the wireless multi-power transmission device 10 under the
control of the device controller 390; a device memory unit 391 for
storing data information on the native ID, temporally storing the
data information of the charging capacity and the charging state
transmitted from the protection circuit module block 37 and the
charger IC block 36 and storing the data transmitted from the
wireless multi-power transmission device 10; and a device
controller 390.
Additionally, the main controller 210 of the wireless multi-power
transmission device 10 may control the transmission of a native
code signal for respective charger blocks 14 in addition to the
charge power signal to the charger blocks that are on charge, the
device controller 390 may analyze the native code signal for the
corresponding charger block 14 transmitted from the wireless
multi-power transmission device 10, and the device memory unit 391
stores a data value of the native code signal for the corresponding
charger block 14 transmitted from the device controller 390.
Furthermore, the device controller 390 may control the transmission
of a data value to the wireless multi-power transmission device 10,
the data value including a voltage value of the power signal
received for the received request signal from the wireless
multi-power transmission device 10.
In order to accomplish the above object, another embodiment of the
present invention provides a method for controlling a wireless
multi-charger system (A) as defined in any one of claims 1 to 4,
including:
1) transmitting a power signal via the primary charging core 13
from wireless multi-power transmission device 10 of the wireless
multi-charger system (A) in every cycle, the power signal including
a call signal for calling a native ID value of the wireless power
transmission device 30, and waiting for the receipt of a response
signal for the power signal (S01);
2) determining the presence of an object by checking a detected
detection signal according to the load modulation in a primary
charging core 13 of one of the charger blocks 14 and determining
whether the detected detection signal is a normal signal (S02);
3) determining whether a native ID signal of the wireless power
transmission device 30 is received by analyzing the detected
reception signal (S03);
4) transmitting a fully charged transmission power from the primary
charging core 13 of the corresponding charger block 14 via the
multi-gate driver module 23 when the received native ID signal is
determined to be a native ID transmitted from the wireless power
transmission device 30 (S04);
5) requesting information on the charging state to the wireless
power transmission device 30 and adjusting a charging level
according to the charging information of the wireless power
transmission device 30 (S05);
6) displaying a fully charged state in an LCD panel 153 or a
charging LED 154 corresponding to the corresponding charger block
14 and stopping a charging operation when the information on the
fully charged state is received from the wireless power
transmission device 30 (S06).
In this case, the object detection step (S02) may include:
converting a plurality of the charger blocks 14 into a foreign
substance detection mode when a detection signal detected through
the corresponding primary charging core 13 and the reception signal
processor module 24 according to the load modulation generated by
objects is not a normal signal, displays a foreign substance error
in the LCD panel 153 or charging LED 154 when the detected foreign
substance is a metal or electronic equipment, and stops a charging
operation on the corresponding charger block 14 (S021).
Also, the charging control step (S05) may include:
requesting data information on the charging capacity to the
wireless power transmission device 30;
receiving data information on the charging capacity and the voltage
data of the power signal transmitted from the wireless power
transmission device 30;
determining the voltage data of the power signal transmitted from
the wireless power transmission device 30;
performing an arithmetic operation on a frequency of the power
signal to compensate for the transmitted power for the voltage data
of the power signal transmitted from the wireless power
transmission device 30;
transmitting a power signal as a compensated frequency to transmit
a compensated power signal to the wireless power transmission
device 30.
Advantageous Effects
As described above, the wireless multi-charger system according to
the present invention may be useful to save the total charging time
of a large number of wireless power transmission devices since one
wireless multi-power transmission device includes a plurality of
the wireless power transmission devices so that a large number of
the wireless power transmission devices can be charged with
electricity.
Also, the wireless multi-charger system according to the present
invention may be useful to prevent the damage of the wireless power
transmission devices and the wireless multi-power transmission
device by stopping the power transmission in the corresponding
charger block when foreign substances are put on charger blocks
that are not charged.
Furthermore, the wireless multi-charger system according to the
present invention may be useful to improve the charging efficiency
by stably performing a continuous charging operation although the
current wireless power transmission device that is on charge is
touched to charge a new wireless power transmission device.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view showing a wireless multi-power
transmission device of a wireless multi-charger system according to
the present invention.
FIG. 2 is a control block view showing the wireless multi-power
transmission device of the wireless multi-charger system according
to the present invention.
FIG. 3 is block view showing the wireless multi-power transmission
device of the wireless multi-charger system according to the
present invention.
FIG. 4 is a control flowchart showing the wireless multi-power
transmission device of the wireless multi-charger system according
to the present invention.
FIG. 5 is a control flowchart showing the wireless multi-power
transmission device of the wireless multi-charger system according
to the present invention.
FIG. 6 is a control block view showing a method for controlling a
wireless multi-charger system according to the present
invention.
FIGS. 7 to 12 are graphic diagrams illustrating the efficiencies to
the power control in the wireless multi-charger system according to
the present invention.
FIG. 13 is configuration view showing a wireless power transmission
device according to one exemplary embodiment of the present
invention.
FIG. 14 is configuration view showing a central controller of the
wireless power transmission device according to one exemplary
embodiment of the present invention.
FIGS. 15 and 16 are an exploded perspective view and a side
cross-sectional view showing the wireless power transmission device
according to the present invention, respectively.
FIG. 17 is a graphic diagram illustrating the efficiencies of the
wireless power transmission device according to the present
invention in the repeated charging/discharging experiments.
FIG. 18 is a circuit view showing a wireless device control module
of the wireless power transmission device according to one
exemplary embodiment of the present invention.
FIG. 19 is a circuit view showing a rectifier member of the
wireless power transmission device according to one exemplary
embodiment of the present invention.
BEST MODE
Hereinafter, preferred embodiment of the present invention will be
described in detail with reference to the accompanying
drawings.
FIG. 1 is a perspective view showing a wireless multi-power
transmission device of a wireless multi-charger system according to
the present invention, FIG. 2 is a control block view showing the
wireless multi-power transmission device of the wireless
multi-charger system according to the present invention, FIG. 3 is
block view showing the wireless multi-power transmission device of
the wireless multi-charger system according to the present
invention, FIG. 4 is a control flowchart showing the wireless
multi-power transmission device of the wireless multi-charger
system according to the present invention, FIG. 5 is a control
flowchart showing the wireless multi-power transmission device of
the wireless multi-charger system according to the present
invention, and FIG. 6 is a control block view showing a method for
controlling a wireless multi-charger system according to the
present invention.
FIGS. 7 to 12 are graphic diagrams illustrating the efficiencies to
the power control in the wireless multi-charger system according to
the present invention. FIGS. 7 to 12 shows the power control when a
wireless power transmission device 30 moves relative to the
wireless multi-power transmission device 10.
FIG. 13 is configuration view showing a wireless power transmission
device according to one exemplary embodiment of the present
invention, and FIG. 14 is configuration view showing a central
controller of the wireless power transmission device according to
one exemplary embodiment of the present invention.
FIGS. 15 and 16 are an exploded perspective view and a side
cross-sectional view showing the wireless power transmission device
according to the present invention, respectively, FIG. 17 is a
graphic diagram illustrating the efficiencies of the wireless power
transmission device according to the present invention in the
repeated charging/discharging experiments, FIG. 18 is a circuit
view showing a wireless device control module of the wireless power
transmission device according to one exemplary embodiment of the
present invention, and FIG. 19 is a circuit view showing a
rectifier member of the wireless power transmission device
according to one exemplary embodiment of the present invention.
That is to say, the wireless multi-charger system (A) according to
the present invention includes a wireless multi-power transmission
device 10 for transmitting a power signal to a wireless power
transmission device 30 in a wireless manner, as shown in FIGS. 1 to
19.
As shown above in FIG. 1, the wireless multi-power transmission
device 10 has a wireless charger case 11 formed as an external
body. In this case, a full-bridge resonant converter 22 and a
central controller 21 for transmitting a power signal to the
wireless power transmission device 30 in a wireless manner are
mounted inside the wireless charger case 11.
Also, a wireless charger table 12 is provided in an upper surface
of the wireless charger case 11. In this case, a plurality of
charger blocks 14 each having a primary charging core 13 are formed
in the wireless charger table 12.
Therefore, the full-bridge resonant converter 22 is provided in a
plural form and coupled respectively to a plurality of the charger
blocks 14. And, a multi-gate driver module 23 is provided to
transmit a converted power signal to each of a plurality of the
full-bridge resonant converters 22 under the control of the central
controller 21. Also, provided is a reception signal processor
module 24 coupled to a plurality of the charger blocks 14 to
process a signal transmitted from the wireless power transmission
device 30 and supply the processed signal to the central controller
21.
Also, the wireless charger case 11 has a power-on/off switch 151;
an input panel 152 for inputting a signal; and a LCD panel 153 and
a charging LED 154 for displaying a charging state of the wireless
charger table 12 and a plurality of the charger blocks 14 and the
wireless power transmission device 30, all of which are formed in
the front thereof, and includes a power supply unit 25 formed
thereinside.
Therefore, the portable wireless power transmission device 30 such
as mobile phones, PDA, PMP, DMB terminals, MP3 or notebook
computers is put on a plurality of charger blocks 14 formed on the
wireless charger case 11, as shown in FIG. 1. Therefore, the power
transmission device 10 detects the wireless power transmission
device 30 and performs a charging operation when the portable
wireless power transmission device 30 is put on a plurality of
charger blocks 14.
Also, referring to the configuration of the central controller 21
for controlling the charging operation in the wireless multi-power
transmission device 10, the central controller 21 includes a power
supply block 211 coupled to the power supply unit 25 to supply a
power source of the wireless multi-power transmission device 10; a
signal output block 212 for outputting a display signal into the
LCD panel 153 and the charging LED 154; a gate output signal
processor block 213 coupled to the multi-gate driver module 23 to
transmit a power signal transmitted from the primary charging core
13; a received signal processor block 214 coupled to one side of
the primary charging core 13 for processing a signal transmitted
from the reception signal processor module 24 for processing a
signal transmitted from the wireless power transmission device 30;
and a main controller 210 for controlling the power supply block
211, the signal output block 212, the gate output signal processor
block 213 and the received signal processor block 214, as shown in
FIG. 2.
In addition, referring to the major configuration of the wireless
power transmission device 30 that is charged while being put on a
plurality of the charger blocks 14 formed in the wireless charger
case 11 of the wireless multi-power transmission device 10, the
wireless power transmission device 30 includes a secondary charging
core 32 for transmitting an induced electric current to correspond
to the primary charging core 13 of the wireless multi-power
transmission device 10; a rectifier block 33 coupled to the
secondary charging core 32 to rectify the induced electric current;
a smoothing filter block 34 coupled to the rectifier block 33 to
filter an electric current; a charger IC block 36 coupled to the
smoothing filter block 34 to charge a power source in the battery
cell 35; a protection circuit module block 37 (PCM) provided
between the charger IC block 36 and the battery cell 35 to detect
an electric current charged in the battery cell 35 and transmit
information on a charging state of the battery cell 35 to the power
receiver controller 39, and detecting overvoltage, under voltage,
electric current and shortcut of a battery; a positive-voltage
regulator block 38 provided to supply a power source to the power
receiver controller 39; and a power receiver controller 39 for
controlling the rectifier block 33, the smoothing filter block 34,
the charger IC block 36, the protection circuit module block 37 and
the positive-voltage regulator block 38 and monitoring the ID
generation and the charging state, as shown in FIG. 3.
Also, the power receiver controller 39 includes a power signal
processor block 393 coupled to the smoothing filter block 34 to
process a transmission signal for the data information on the power
signal received from the wireless power transmission device 10; a
charge signal processor block 394 coupled to the charger IC block
36 and the protection circuit block 37 to process a transmission
signal for the data information on the charging capacity and
charging state of the battery cell 35; a signal processor block 392
for processing information on the charging capacity and data
information on the native ID that are transmitted to the wireless
multi-power transmission device 10 under the control of the device
controller 390; a device memory unit 391 for storing data
information on the native ID, temporally storing the data
information of the charging capacity and the charging state
transmitted from the protection circuit block 37 and the charger IC
block 36 and storing the data transmitted from the wireless
multi-power transmission device 10; and a device controller
390.
The wireless multi-charger system (A) according to the present
invention, as configured thus, has an advantage that several
wireless power transmission devices 30 may be charged only one time
since the wireless charger table 12 formed on the wireless
multi-power transmission device 10 is formed of a plurality of the
charger blocks 14.
The charging operation of the wireless multi-charger system (A)
according to the present invention is described in more detail, as
follows.
1) First, a standby mode step (S01) in which a power signal is
transmitted in every cycle via gate signal paths 234 of the gate
output signal processor block 213--the multi-gate driver module
23--the full-bridge resonant converter 22--the corresponding
primary charging cores 13 of respective charger blocks 14 is
performed under the control of the central controller 21 in the
wireless multi-power transmission device 10 of the wireless
multi-charger system (A). As described above, in the standby mode
step (S01), a power signal is transmitted via the primary charging
core 13 in every cycle, the power signal including a call signal
for calling a native ID value of the wireless power transmission
device 30, and waiting for the receipt of a response signal for the
power signal.
2) Then, while a call signal for a native ID value is transmitted
and the receipt of a response signal for the call signal is waited
for in the standby mode step (S01), an object detection step (S02)
of receiving a detection signal according to the load modulation is
performed in the primary charging core 13 of one of the charger
blocks 14. When any object is detected as described above, the
portable wireless power transmission devices 30, such as mobile
phones, PDA, PMP, DMB terminals, MP3 or notebook computers, that
may be charged in a wireless manner; and conventional electronic
equipments that may not be charged in a wireless manner may be put
on the charger blocks 14. Therefore, the wireless multi-power
transmission device 10 receives a signal according to the load
modulation as a detection signal, the load modulation being
generated by any of the objects as listed above, and simultaneously
determines the presence of the object by determining whether the
objects are put on the top of the charger block 14.
When particular problems do not occur by the use of the non-mental
materials and the load modulation caused by the movement of the
objects, the wireless multi-power transmission device 10 may be
converted into the standby mode step (S01). However, the heat
generation and erroneous operations of equipment may occur due to
the charging operation in the case of the electronic equipment that
may not be charged in a wireless manner, not in the case of the
wireless power transmission device 30 that may be charged in a
wireless manner.
Therefore, the object detection step (S02) includes: detecting
these foreign substances (parasitic metal detection (PMD)) (S021).
That is to say, the foreign substance detection step (S021)
includes: determining whether a detection signal is not a normal
signal, the detection signal being detected through the
corresponding primary charging core 13 and the reception signal
processor module 24 according to the load modulation generated by
objects in a plurality of the charger blocks 14. The signal
transmitted under the control of the central controller 21 is
determined whether it is an abnormal signal whose signal
determination is impossible by comparing the reception signal
according to the load modulation. Therefore, the corresponding
charger block 14 is converted into a foreign substance detection
mode when the corresponding charger block 14 detects a foreign
substance, and displays a foreign substance error in the LCD panel
153 or the charging LED 154 when the detected foreign substances is
a metal or electronic equipment, and operates to stop a charging
operation of the corresponding charger block 14 (parasitic metal
detection (PMD) error).
3) However, a native ID determination step (S03) of analyzing and
determining the detected signal according to the load modulation
when the detected reception signal is determined to be data for
native ID of the wireless power transmission device 30 that may be
charged in a wireless manner. In the standby mode step (S01), a
signal for searching the wireless power transmission device 30 is
transmitted together with a request signal for requesting a data
value of the native ID of the wireless power transmission device
30. Therefore, an induced electric current generated by the
secondary charging core 32 is rectified through the rectifier block
33 in the wireless power transmission device 30, and then filtered
through the smoothing Filter block 34. During this process,
information on the received native ID request is transmitted to the
device controller 390 of the power receiver controller 39, and
therefore a native ID data value of the corresponding wireless
power transmission device 30, which is stored in the device memory
unit 391, is transmitted to the wireless multi-power transmission
device 10 via the signal processor block 392. Therefore, in the
case of the native ID determination step (S03), the receive
reception signal according to the load modulation is processed in
the reception signal processor module 24 coupled to the primary
charging core 13 of the wireless multi-power transmission device
10, and then transmitted to the main controller 210 of the central
controller 21 via the received signal processor block 214. Then,
the main controller 210 determines whether the received data is a
normal native ID data of the wireless power transmission device 30,
and then determines whether the wireless power transmission device
30 is a normal device that can be charged in a wireless manner by
determining whether the received data is a native ID data
transmitted from the normal wireless power transmission device
30.
4) Subsequently, when the received data is proven to be a native ID
transmitted from the wireless power transmission device 30, a fully
charged power transmission step (S04) of transmitting a fully
charged transmission power from the primary charging core 13 of the
corresponding charger block 14 is performed in the multi-gate
driver module 23.
Referring to the fully charged power transmission step (S04) in the
wireless multi-power transmission device 10, when the main
controller 210 of the central controller 21 determines that the
normal wireless power transmission device 30 is put on the charger
block 14 of the main controller 210, the main controller 210
transmits a control signal with the transmission of the power
signal via the gate output signal processor block 213 and the gate
signal path 234.
Since the control signal is transmitted to the multi-gate driver
module 23, and then transmitted with the transmission of the power
signal, a power signal is transmitted to the primary charging core
13 of the corresponding charger block 14 via the corresponding
full-bridge resonant converter 22, and then the power signal is
transmitted to the wireless power transmission device 30 due to the
generation of an induced magnetic field.
During a series of these processes, configurations of the gate
signal path 234 and the multi-gate driver module 23 will be
described in more detail, as follows.
First, the gate signal path 234 may be composed of a plurality of
signal paths corresponding respectively to the respective charger
blocks 14. Therefore, a control signal of the main controller 210
is transmitted to the multi-gate driver module 23 via the
respective corresponding signal paths of the gate signal paths 234.
In this case, the multi-gate driver module 23 may include a gate
signal converter unit 232 for processing a gate signal; an output
driver 233 for transmitting the processed signal to the
corresponding full-bridge resonant converter 22; and a gate
controller 231.
Therefore, the gate signal path 234 is composed of a plurality of
signal paths corresponding to the respective charger blocks 14. In
this case, the main controller 210 is configured to transmit
respective control signals to the charger block 14 respectively via
the gate output signal processor block 213 including a plurality of
output signal processor members, and therefore the gate signal
converter unit 232 of the multi-gate driver module 23 may be
composed of a plurality of converter members corresponding
respectively to the charger blocks 14.
And, the gate controller 231 is configured to control the signal
transmission/reception and signal processing in the multi-gate
driver module 23. According to this exemplary embodiment, the
control signal transmitted from the main controller 210 may be
transmitted to members corresponding respectively to the charger
blocks 14, and therefore a power signal is transmitted to stably
transmit an induced magnetic field. As a result, this configuration
is suitable to a small wireless multi-power transmission device
10.
Also, according to another exemplary embodiment of the multi-gate
driver module 23 and the gate signal paths 234, the gate signal
path 234 may be configured as a single path, and the gate signal
converter unit 232 of the multi-gate driver module 23 may also be
configured as a single converter member (or a plurality of
converter member).
In this regard, the main controller 210 transmits a control signal
to the multi-gate driver module 23. In this case, the control
signal is transmitted together with a code signal for the
corresponding charger block 14 prior to transmission of a
conversion signal, and the gate controller 231 of the multi-gate
driver module 23 receiving the control signal determines a signal
for which charger block 14 the control signal transmitted from the
main controller 210 is, and the converted power signal may be
transmitted to the full-bridge resonant converter 22 as a code
signal for the corresponding charger block 14.
Therefore, it is possible to simplify the configuration of the main
controller 210 and the multi-gate driver module 23, and this
configuration may be suitable to manufacture the wireless
multi-power transmission device 10 and the wireless power
transmission device 30 in a large scale.
5) Then, a charging control step (S05) is performed by requesting
information on a charging state to the wireless power transmission
device 30 and controlling a charging level according to the
received charging information of the wireless power transmission
device 30.
Then, the wireless power transmission device 30 controls the
charger IC block 36 and the protection circuit module block 37 to
charge a power source into the battery cell 35, the power source
being transmitted via the rectifier block 33 and the smoothing
filter block 34 under the control of the device controller 390
after the fully charged power transmission step (S04).
For this charging operation, the device controller 390 receives
information on a charging state of the battery cell 35 through the
charger IC block 36 and the protection circuit module block 37, and
temporally stores the information on a charging state in the device
memory unit 391. Then, when the battery cell 35 is in a fully
charged state, the charging operation is stopped by controlling the
charger IC block 36. Also, information on the fully charged state
is generated in the secondary charging core 32 through the signal
processor block 392. Also, when a voltage of the charged battery
cell 35 is less than a predetermined reference voltage, the battery
cell 35 is converted again into a charging state to perform another
charging operation. However, the battery cell 35 is proven to be in
a fully charged state, the charging of the battery cell 35 is
stopped (No Operation).
Therefore, the main controller 210 of the wireless multi-power
transmission device 10 requests information on the charging levels
in every step of the wireless power transmission device 30 in the
charging control step (S05). In this case, the device controller
390 of the wireless power transmission device 30 transmits data of
the information on the charging state of the battery cell 35 using
a load modulation method.
As described above, the information on the charging state
transmitted from the wireless power transmission device 30 is
transmitted to the main controller 210 coupled to the received
signal processor block 214 through the reception signal processor
module 24. The reception signal processor module 24 includes a
plurality of reception signal input units 243 for receiving signals
detected in the respective charger blocks 14 through the load
modulation; a reception signal processor unit 242 for converting a
detection signal according to the load modulation of each of the
charger blocks 14; and a reception signal controller 241 for
controlling an operation of the reception signal processor module
24.
Therefore, the transmission information of the wireless power
transmission device 30 received through the load modulation is
converted into signals in the reception signal processor module 24,
depending on the respective charger blocks 14, and the converted
signals are transmitted to the main controller 210 through the
received signal processor blocks 214.
The reception signal processor module 24 may generally have a
plurality of amplifiers, LPF, OR logic circuits and the like, all
of which are mounted thereinside. In particular, in the case of the
configuration of the reception signal processor unit 242 and the
reception signal path 244 of the reception signal processor module
24, the reception signal processor unit 242 and the reception
signal path 244 may be configured as a single member or as a
plurality of members so as to generate a native code each of the
corresponding charger blocks 14, as described above in the
exemplary embodiment of the multi-gate driver module 23.
That is to say, when signals according to the load modulation are
transmitted to each of the charger block 14s, a plurality of the
reception signal processor units 242 according to this exemplary
embodiment process their own signals, and transmit the processes
signals to the main controller 210 via the respective reception
signal paths 244. Therefore, signals generated in the corresponding
charger blocks 14 are accurately transmitted to the main controller
210 through the separate signal processing and via the paths, and
processed in the main controller 210, and therefore it is possible
to operate a system stably. Also, this system may suitably apply to
small devices as in the above-mentioned multi-gate driver module
23.
In addition, for the exemplary embodiment in which each of the
reception signal processor unit 242 and the reception signal paths
244 is configured as a single member, the reception signal
processor unit 242 of the multi-gate driver module 23 determines a
reception signal for which charger block 14 the received signal
according to the load modulation is under the control of the
reception signal controller 241, and the processed reception signal
is divided into categories together with the code signal for the
corresponding charger blocks 14 when the processed reception signal
is transmitted via the received signal processor block 214. Then,
the main controller 210 receives the reception signals for the
respective charger blocks 14, divides respective signals into
categories and processes the signals by category. Therefore, the
configuration of single members may be used as the simplified
configuration of the entire members.
Accordingly, the wireless multi-power transmission device 10
requests data information on a charging level to the wireless power
transmission device 30 that is charged in the corresponding charger
block 14 through the multi-gate driver module 23 and the primary
charging core 13, depending on the corresponding charger block 14.
As a result, the corresponding wireless power transmission device
30 transmits the data information on a charging level of the
battery cell 35 that is received via the charger IC block 36 and
the protection circuit module block 37.
Also, the information is transmitted to the main controller 210 via
the primary charging core 13 of the respective charger block 14 and
the reception signal processor module 24.
Then, the main controller 210 of the central controller 21 displays
information on a charging level or state in the form of letters or
figures on the LCD panel 153 through the signal output block 212,
depending on the data of the charging level in the corresponding
wireless power transmission device 30, and controls the charging
LED 154 to display that the corresponding charger block 14 is on
charge. Then, the LCD panel 153 displays a charging state along
with the number of the corresponding charger block 14. Also, the
LCD panel 153 displays that each of the respective charger blocks
14 turns on the charging LED 154. For example, the charging
operation of the battery cell 35 is stopped when a lamp of the
charging LED 154 is turned off, the battery cell 35 is on charge
when the lamp is flickered, a green light is turned on the battery
cell 35 is fully charged, and a red light is turned on when errors
such as a foreign substance error, a native ID error are caused. As
described above, the charging operation of the battery cell 35 may
be performed in various manners.
During a series of these charging processes, when the wireless
power transmission device 30 moves from the corresponding charger
block 14 of the wireless charger table 12, a charging efficiency in
the wireless power transmission device 30 may be maximized by
converting a power signal transmitted from the corresponding
charger block 14 of the wireless multi-power transmission device
10.
6) Finally, when the information on the fully charged state is
received from the wireless power transmission device 30, the fully
charged state is displayed in the LCD panel 153 or the charging LED
154 corresponding to the respective charger block 14, and the fully
charged state step (S06) of stopping the charging operation is
performed to stop the charging operation for the corresponding
charger block 14.
When a user removes the fully charged wireless power transmission
device 30 from the charger block 14 whose charging operation is
stopped, and inputs an operation start signal again, the charger
blocks 14 is preferably in a standby mode.
Also, when a foreign substance error or an ID error is caused in
the foreign substance detection step of detecting foreign
substances, the error is displayed in the corresponding charger
block 14, and the charging operation of the corresponding charger
block 14 is then stopped to ensure the stability of the wireless
multi-power transmission device 10, the wireless power transmission
device 30 or other metal materials, and the electronic equipment.
Therefore, when the charging operation of the corresponding charger
block 14 is stopped due to the generation of the errors, the
charger block 14 is in a standby mode until a re-start signal is
inputted into the charger block 14 by a user.
Of course, a pulse signal is periodically transmitted to the
charger blocks 14 when there is the error or the fully charged
state. In this case, the charger blocks 14 are normally converted
into a standby mode when the charger blocks 14 senses that the
error is solved, for example, by removing the fully charged
wireless power transmission device 30 or foreign substances using
the signal according to the load modulation.
Also, the main controller 210 of the wireless multi-power
transmission device 10 may be configured to control the charger
block that is on charge to transmit a native code signals for the
respective charger blocks 14 together with the charge power signal.
Therefore, the device controller 390 may be configured to analyze
the native code signals for the corresponding charger blocks 14
that are transmitted from the wireless multi-power transmission
device 10, and the device memory unit 391 may be configured to
store a data value of the native code signals for the corresponding
charger blocks 14 that are transmitted from the device controller
390.
In addition, the device controller 390 is configured to control the
data value for the voltage value of the power signal to be
transmitted to the wireless multi-power transmission device 10, the
voltage value of the power signal being received for the request
signal received from the wireless multi-power transmission device
10.
Also, a power source for USB ports of computers, and a power source
inputted from an AC adapter, a cigar Jack and the like may be
supplied to the power supply unit 25.
Also, a temperature detector unit 26 is provided to detect
temperature of the corresponding charger block 14 or the wireless
multi-power transmission device 10 during the charging procedure.
Therefore, an operation of the corresponding charger block 14 may
be stopped when the corresponding charger block 14 is heated to the
hot temperature detected in the temperature detector unit 26, and
an operation of the entire system may be stopped when the entire
wireless multi-power transmission device 10 is heated to the hot
temperature.
In addition, a current detection member may be provided in each of
the power supply unit 25, the multi-gate driver module 23, the
respective full-bridge resonant converters 22 or the reception
signal processor modules 24 to monitor a flow of electric current.
In this case, when the corresponding members becomes an over
current and overvoltage state by means of the current detection
member, operations of the corresponding member and its related
charger block 14 are stopped, or an operation of the system is
stopped, and they transmit a signal for the error.
Then, FIG. 13 is a configuration view showing a wireless
multi-power transmission device according to one exemplary
embodiment of the present invention. Referring to the configuration
of the wireless multi-power transmission device according to one
exemplary embodiment of the present invention, the wireless power
transmitter includes a control logic for IC communication with a
receptor module installed inside the wireless power transmission
device that is a wireless device; and a pre-driver for driving a
full-bridge resonance-type converter to generate an induced
electromotive force using LC resonance. And, an SPI controller for
communication with EEPROM for storing various parameters may be
installed inside the wireless power transmitter. Also, a clock
input port for operation of the system, an LCD backlight for
displaying a charging state of the wireless device, and an
input/output port for controlling ports of the LCD may be installed
inside the wireless power transmitter. Furthermore, the wireless
power transmitter may include an LED input/output port for checking
the operation of the wireless device, VCC and GND input ports for
DC power source, and a shout-down port for detecting temperature of
a transmission coil and stopping the operation of the wireless
device when an inside comparator determines the temperature of the
transmission coil to be more than a predetermined temperature.
Also, FIG. 14 is a configuration view showing a central controller
of the wireless multi-power transmission device according to one
exemplary embodiment of the present invention. Here, it is shown
that the central controller may be configured with a single mold.
This single chip may have a function to enable wireless power
transmission, and the FET Pre-driver has an output function, and
the analog unit has a comparator installed thereinside, the
comparator having an ID detection function, and may include a
power-on reset, 5V, VCC-5V, a 3.3V positive-voltage regulator
(including a shut-down function in shortcut), and an input port for
detecting temperature of the transmission/reception coil
temperature. Also, the digital unit may include an SPI interface
for serial communication, a logic for controlling wireless power
transmission, and an amplifier for an external system clock
oscillator amplifier. Also, a plurality of input/output ports may
be installed inside the central controller to drive LED, backlight,
LCD, etc.
Also, FIG. 18 is a circuit view showing a wireless device control
module of the wireless power transmission device according to one
exemplary embodiment of the present invention. Here, it is shown
that members for controlling the wireless power transmission device
30 may be configured with a single mold. That is to say, the
wireless device control module has a function to communicate with
the wireless multi-power transmission device 10 in a wireless
manner, and may include members such as a pre-driver and FET for ID
generation, a comparator for analog input, a power-on reset as an
analog unit, a clock oscillating circuit, 64-bit interior/exterior
ID and a control logic. When a voltage of a battery is detected by
this mold, the wireless device control module may have a function
to be converted into a recharge mode, a function to feed back a
value of the fully charged state of the charger IC, a function to
detect a phase to recognize an encryption code, etc. In addition to
the functions, the wireless device control module may be designed
to have an output port for controlling an external DC/DC converter
or a charger IC, an analog input and a comparator for controlling
up and down of power, input/output ports for setting various
modes.
Also, FIG. 19 is a circuit view showing a wireless power
transmission device according to one exemplary embodiment of the
present invention. Here, it is shown that a member for processing a
power signal transmitted from the wireless multi-power transmission
device 10 may be formed with a singly mold.
Referring to the configuration of this mold, a synchronous
rectifier chip aids the adjustment of power in a receptor module of
the power-receiving battery system using an induced electromotive
force. Therefore, the mold may include a synchronous rectifier for
generating a DC voltage from a reception coil to minimize the power
loss and the heat generation, and a buck-converter used to
previously control the output of the rectifier so as to supply a
predetermined voltage to a charging circuit. This buck-converter
may be switched on at a rate of high-speed 2 MHz so as to reduce
output ripples of the rectifier and employ a micro chip inductor.
Also, the output of the buck-converter may be used as an input of a
linear charging circuit, and a built-in linearly charging function
allows a battery to be charged with CC/CV. In this case, the
battery is designed to set a charge electric current to a
predetermined current level. This linearly charging function has a
fully charged state port that may feed back a charging state of the
battery, and the linearly charging function may also have a low
dropout (LDO) regulator installed thereinside, the LDO regulator
having an output voltage of 2.85V to supply a power source to a
power receiver chip (a wireless device control module) that is IC
for controlling external systems.
Also, this synchronous rectifier chip has low heat generation and
drop characteristics (i.e., 0.4V drop in a rectifier), and has a 2
MHz buck-converter installed thereinside for the purpose of the
high efficiency. Also, the synchronous rectifier chip may be
maintained to the maximum input voltage of about 20V, installed
inside the battery pack in the form of a Micor SMD package, and
optimized for the wireless power transmission within several
hundreds of kHz bandwidth. In this case, a P-channel field effect
transistor (PFET) of the buck-converter has a low Rdson value of
240 m.OMEGA. and the maximum load current of 700 mA, and a LDO
regulator with 2.85V@10 mA may be installed inside the PFET.
Next, a power control procedure will be described in more detail in
the charging control step (S05), as follows.
That is to say, a power signal transmitted by the primary charging
core 13 of the wireless multi-power transmission device 10 is
transmitted via the secondary charging core 32 of the wireless
power transmission device 30. In this case, the device controller
390 receives information on the input voltage intensity of the
power signal. Then, the device controller 390 desirably maintains
the voltage of the power signal to a constant voltage level when
the device controller 390 detects that a voltage (for example,
about 5V) of the power signal received in the device controller 390
is transmitted as a stable voltage. When the voltage of the power
signal received in the device controller 390 is too low or too
high, the wireless power transmission device 30 may be configured
to receive a constant voltage by transmitting information on
voltage regulation to the wireless multi-power transmission device
10 in a load modulation manner. When the voltage of the power
signal is regulated to the constant voltage, the device controller
390 controls the battery cell 35 to be charged with power by
converting an operation of the charger IC in the charger IC block
36 of the wireless power transmission device 30 into an active
state.
When the battery cell 35 of the wireless power transmission device
30 is charged with the power transmitted from the wireless
multi-power transmission device 10 as described above, the
protection circuit module block 37 is configured to stably charge
the battery cell 35 with electric power by checking the stability
of the battery cell 35 while the battery cell 35 is on charge.
When the wireless power transmission device 30 put on the
corresponding charger block 14 of the wireless multi-power
transmission device 10 moves around during the charging operation
of the wireless multi-charger system (A) used as the wireless
multi-power transmission device 10 and the wireless power
transmission device 30, positions of the primary charging core 13
and the secondary charging core 32 are changed, which leads to the
decreased receiving rate of the power signal received from the
wireless power transmission device 30. As a result, the primary
charging core 13 and the secondary charging core 32 move to
inappropriate positions as the wireless power transmission device
30 becomes remote from the center toward a horizontal or vertical
direction as shown in FIGS. 7 and 8, and therefore an induced
electromotive force is not desirably generated in the wireless
power transmission device 30.
Therefore, when the voltage of the power signal, which is received
into the wireless power transmission device 30 put on the
corresponding charger block 14, is less than the reference voltage
value, the wireless multi-charger system (A) according to the
present invention transmits a request signal for voltage
compensation to the wireless multi-power transmission device 10 so
as to supplement the shortage in the voltage of the power signal
and transmit the supplemented voltage of the power signal.
For example, assume that a voltage of the received power signal is
set to the reference voltage of 5V, and a reference deviation value
is set to a voltage of 0.5V. In this case, when the wireless power
transmission device 30 receives a voltage of less than 4.5V due to
the movement of the wireless power transmission device 30, the
device controller 390 of the wireless power transmission device
controller module 39 controls the secondary charging core 32 to
boost a voltage by about 0.5V and transmit the boosted voltage.
Then, the secondary charging core 32 transmits a boost request
signal via the signal processor block 392.
As a result, the wireless multi-power transmission device 10
transmits the boosted power signal in response to the 0.5V boost
request signal. That is to say, an oscillation frequency may be
varied, for example, to boost a transmission power outputted from
the wireless multi-power transmission device 10.
As described above, the power signal transmitted from the wireless
multi-power transmission device 10 is regulated according to the
changes in the position of the wireless power transmission device
30. Theses charging efficiencies according to the changes in the
position are shown in FIGS. 7 to 12.
That is to say, FIGS. 7 to 10 are graphic diagrams showing a
primary power (W) in the wireless multi-power transmission device
and a secondary power (W) in the wireless power transmission
device, and their efficiencies (%), all of which are measured by
moving the wireless power transmission device 30 on the
corresponding charger block 14 of the wireless multi-power
transmission device by -7 mm.about.7 mm in a horizontal direction
and a vertical direction, respectively, when it is assumed that a
secondary reference power of the wireless power transmission device
is set to a voltage level of about 2.5 W. Here, the efficiency (%)
is represented by an efficiency of an output power of the wireless
multi-power transmission device to a primary input power of the
wireless multi-power transmission device ((secondary power/primary
power)*100), the output power being applied to a secondary side of
the wireless multi-power transmission device.
Also, it is shown that the compensation of the transmission power
is adjusted to a voltage level 0.5 W according to the present
invention. Therefore, FIGS. 7 and 8 show graphs that is plotted in
a secondary power of 2.about.2.5 W in the case of the wireless
power transmission device, which indicates the charging efficiency
when the wireless power transmission device 30 is charged without
the compensation of the power signal according to the changes in
frequency in the wireless charger apparatus 10 relative to the
changes in horizontal distances and vertical distances of the
wireless multi-power transmission device 10 and the wireless power
transmission device 30. That is to say, when wireless power
transmission device 30 moves in a horizontal distance or a vertical
distance relative to the wireless multi-power transmission device
10, a secondary power of the wireless power transmission device 30
drops as the secondary power goes away from the center of the
wireless power transmission device 30, which leads to the
decreasing efficiency.
However, for the wireless multi-charger system (A) according to the
present invention as shown in FIG. 9 (a graph according to the
movement of the wireless power transmission device 30 in a
horizontal direction) and FIG. 10 (a graph according to the
movement of the wireless power transmission device 30 in a vertical
direction) on the contrary to FIGS. 7 and 8, information on the
changes in the received power voltage is transmitted from the
wireless power transmission device as the wireless power
transmission device 30 moves in a horizontal direction and a
vertical direction on the top of the charger block 14 of the
wireless multi-power transmission device 10. As a result, the
wireless multi-power transmission device 10 shows its efficiency by
controlling a power through the changes in frequency. This
indicates that the power transmission is stably performed in the
wireless power transmission device 30, and therefore it is revealed
that the efficiency in the power transmission is good.
Also, FIG. 11 shows a graph plotting efficiencies according to the
movement of the wireless power transmission device 30 in a
horizontal direction, and FIG. 12 shows a graph plotting
efficiencies according to the movement of the wireless power
transmission device 30 in a vertical direction. Here, it is
revealed that the efficiencies are better when there is the power
compensation according to the change in frequency (an upper
rectangular dot graph, POWER CONTROL) than when there is no power
compensation according to the change in frequency (a lower curve
graph, FIXED POWER).
Therefore, a power source is stably transmitted in a wireless
manner through the wireless power transmission of the wireless
multi-charger system (A) that is carried out in the wireless
multi-power transmission device 10 and the wireless power
transmission device 30. Therefore, the wireless multi-power
transmission device 10 and the wireless power transmission device
30 may be stably used in the wireless multi-charger system (A).
In particular, the charging method for the power compensation in
the charging control step (S05) of performing the above-mentioned
wireless power transmission may be used as a better charging method
in the case of the configuration in which a plurality of the
charger blocks 14 are provided in the wireless multi-power
transmission device 10 according to the present invention.
That is to say, various kinds of the wireless power transmission
devices 30 may be positioned and charged on the wireless charger
table 12 in the case of the configuration in which a plurality of
the charger blocks 14 is configured on the wireless charger table
12 as shown in FIG. 1.
In this case, portable wireless power transmission devices such as
mobile phones, PDA, PMP, DMB terminals, MP3 or notebook computers
may be used as the wireless power transmission device 30. While one
wireless power transmission device is charged on the charger block
14 positioned in one side of the wireless charger table 12, another
wireless power transmission device may be put and charged on the
charger block 14 positioned in another side of the wireless charger
table 12.
Furthermore, when a user touches the wireless power transmission
device that is being already charged, or shakes the wireless
multi-power transmission device 10, a primary charging core of the
corresponding charger block 14 and a secondary charging core of the
wireless power transmission device that is on charge may be
unfortunately changed in position. Since the wireless power
transmission device that is being on charge is charged with a
stable voltage due to the compensation of the charging power as
described above, a corresponding device may continue to be charged
without any big troubles until the device is in a fully charged
state.
For the wireless multi-charger system (A) according to the present
invention, a wireless power transmission device is charged on each
of the respective charger blocks 14. In this case, small mobile
phones may not only be charged on the respective charger blocks 14,
but large wireless power transmission devices that may be charged
in a wireless manner may also be charged on the respective charger
blocks 14.
Therefore, a secondary charging core of the corresponding wireless
power transmission device may be charged in a position
corresponding to a primary charging core of one charger block, but
other parts of the wireless power transmission device that are free
from the secondary charging core are put on other charger blocks
due to the big size of the wireless power transmission device. In
this case, the other charger blocks are converted into a foreign
substance error mode to stop the power transmission, which may
prevent the damage of other part of the wireless power transmission
device.
Also, since parts, such as metal lines, of the wireless power
transmission device may be used to perform a wireless charging
operation, the charger blocks on which the parts are positioned are
converted into a foreign substance error to stop the power
transmission. Therefore, the wireless power transmission device and
the wireless multi-power transmission device may stably perform
their charging operation according to the power transmission since
only the charger block on which the secondary charging core of the
large wireless power transmission device is positioned performs its
wireless charging operation.
In addition, the wireless power transmission device 30 according to
the present invention includes a shielding member for protecting
the wireless power transmission device 30 and the battery cell 35
from the magnetic field that is generated by the primary charging
core 13 of the wireless multi-power transmission device 10 and the
secondary charging core 32 of the wireless power transmission
device 30, as shown in FIGS. 15 to 19.
First of all, FIG. 13 is an exploded perspective view showing a
configuration of a wireless power transmission device 30 having a
wireless power receiver module. Here, a battery pack composed of
coil, fine metal, thin aluminum film (foil, etc.), lithium ion or
lithium polymer has no effect on cells since a thin aluminum film
is introduced into the battery pack to completely cut off the
magnetic field, which allow the cells to be charged/discharged at
cell cycles of 500 or more. Here, the shapes of the secondary
charging core include all kinds of cores. That is to say, the
shapes of the core may include a rectangular shape, a round shape
or an oval shape, and various cores such as a winding coil, a
spiral core and the like may be provided herein. In this case, the
wireless power transmission device 30 having a wireless power
receiver module includes a wireless power receiver circuit 40
including members such as a power receiver controller 39 and a
charger IC block 36, both of which are formed in one side of the
charging battery cell 35, and the wireless power receiver circuit
40 may include a shielding member 41 for preventing a surrounding
magnetic field.
Also, the wireless power transmission device 30 is provided with
shielding plates 42, 43, 44, 45 and 46 provided in the bottom, the
front, the rear, the left side and the right side of the charging
battery cell 35 to protect the battery cell 35 from the magnetic
field of the primary core block and the secondary core block 32 by
shielding the magnetic field.
Then, since the five regions, for example, the front, the rear, the
left side, the right side and the bottom of the battery cell 35 are
provided respectively with the shielding plates 42, 43, 44, 45 and
46 to cut off the magnetic field generated by the primary core
block and the secondary core block 32, it is possible to prevent
damage of the battery cell 35 from the magnetic field. Therefore,
an additional shielding plate may be provided in an upper surface
of the battery cell 35, when necessary. In this case, it is
desirable when temperature is not increased due to the completely
closed surroundings of the battery cell 35.
As described above, the shielding plates 42, 43, 44, 45 and 46 and
the shielding member 41 may be formed of thin discs including Al,
Cu, Ni Alloy metals.
Also, a magnetic plate 48 is formed between the shielding plates 46
and the charge receiver module 321 to facilitate the induction of
the magnetic field induced from the secondary charging core 32, the
shielding plates 46 formed in the bottom of the battery cell 35,
and the charge receiver module 321 including the secondary charging
core 32. This magnetic plate 48 includes amorphous ferrites, Mn--Zn
(50 parts by weight:50 parts by weight), Ni--Fe (80 parts by
weight:20 parts by weight), fine metals (Fe--Si--Cu--Nb), etc.
The magnetic plate 48 may be composed of an upper magnetic plate
481 formed between the shielding plates 46 and the charge receiver
module 321; and a lower magnetic plate 252 disposed in a lower
portion of the charge receiver module 321. Therefore, the lower
magnetic plate 482 may have a lower plate thorough hole as a
thorough hole passed through the center thereof. This shape of the
lower plate thorough hole 483 is preferably formed with the same
shape as the core of the secondary core block 32. For example, FIG.
15 shows that the lower plate thorough hole 483 of the lower
magnetic plate 482 is formed with a round shape since the secondary
core block 32 is formed of a round core. However, when the core is
formed with a rectangular shape or a polygonal shape, the lower
plate thorough hole 483 is preferably formed with the same shape.
Therefore, an induced electromotive force is easily generated in
the secondary core block 32 due to the presence of the lower plate
thorough hole 483, the secondary core block 32 being that is
present within the induced magnetic field, and the signal may be
transmitted/received in an easy manner.
Also, the magnetic plate 48 is provided with an insulating plate 47
that is provided between the shielding plates 46 and the battery
cell 35 to insulate the battery cell 35, the shielding plates 46
being formed in the bottom of the battery cell 35. Since this
insulating plate 47 is formed in the form of a mesh or thin film
that is made of Ni--Cu, the heat of the shielding plates 46 is not
delivered to the battery cell 35.
As another example of the magnetic field shielding member, the
magnetic plate 48 is provided with a magnetic plate 48 (a primary
HPES:Hanrim Postech Electro-magnetic shield) formed between an
aluminum-based battery cell case 35' and the secondary core block
32 as shown in FIG. 16, the aluminum-based battery cell case 35'
constituting an outer body of the battery cell 35. In this case, a
shield mesh member 49 is further provided as a secondary HPES
between the magnetic plate 48 (i.e., a primary HPES) and the
battery cell case 35'. The magnetic plate 48 as a primary HPES and
the shield mesh member 49 as a secondary HPES may be composed of
the same components as in the above-mentioned shielding member.
It is known that most of the magnetic field is shielded by the
magnetic plate 48 that is a primary HPES. As shown in FIG. 16, it
is revealed that a line of magnetic force does not affect a battery
cell since the line of magnetic force is bent by the magnetic plate
48 that is a shielding plate. As a result, the heat is generated in
a peak region by the line of magnetic force, and then radiated out
by the metallic magnetic plate 48. In addition, the shield mesh
member 49 as a secondary HPES is formed by coating a metal mesh
with a coating agent selected from the group consisting of
amorphous ferrites, Mn--Zn (50 parts by weight:50 parts by weight),
Ni--Fe (80 parts by weight:20 parts by weight), or fine metals
(Fe--Si--Cu--Nb). Therefore, the secondary HPES functions to shield
the magnetic field that is not shielded by the magnetic plate 48
that is a primary HPES. An eddy current is formed by excessive line
of magnetic force in the metal mesh of the shield mesh member 49
that is a secondary HPES. In this case, the battery pack should be
affected by the magnetic field that is generated by the primary
core block and the secondary core block due to the presence of the
eddy current formed in the metal mesh. In this experiment, it is
revealed that about 90% of the magnetic field is shielded by the
magnetic plate 48 that is a primary HPES, and about 10% of the
magnetic field is shielded by the shield mesh member 49 that is a
secondary HPES.
The wireless power transmission device 30 including the magnetic
plate 48 as a primary HPES and the shield mesh member 49 as a
secondary HPES is used to repeat a charging experiment (500 cycles)
for the charging efficiency. Here, a battery is not coupled to a
charging device in wireless manner, but the battery is coupled to
the charging device through wires to perform a charging/discharging
experiment, as shown in FIG. 17. Accordingly, FIG. 17 shows a graph
that is plotted using an 80% efficiency curve as the reference
curve (hereinafter, referred to as "standard efficiency line
segment" (D)), the 80% efficiency curve being obtained through the
repeated charging/discharging of a battery pack at 500 cycles and
referred to as a stable charging efficiency. First, when the
wireless power transmission device 30 is generally charged through
electrical contacts without the exposure to the magnetic field (a
graph represented by "N" in FIG. 17), the experiment of the
wireless power transmission device 30 is carried out so that the
charging capacities can be plotted over the standard efficiency
line segment, which indicates that the charging/discharging
efficiency is stable in the battery pack.
Accordingly, for the wireless power transmission device 30
according to the present invention, it is shown that the
charging/discharging efficiency by the magnetic plate 48 as a
primary HPES and the shield mesh member 49 as a secondary HPES (a
graph represented by "A" in FIG. 17) is stable with an efficiency
of 83.9% on the basis of 500-cycle charging/discharging
experiment.
However, when the secondary HPES is not used in the wireless power
transmission device 30, it is shown that the charging/discharging
efficiency (a graph represented by "B" in FIG. 17) is rather low
with an efficiency of 75.3% on the basis of 460-cycle
charging/discharging experiment. When the primary HPES and the
secondary HPES are not used in the wireless power transmission
device 30, it is shown that the charging/discharging efficiency (a
graph represented by "C" in FIG. 17) is very low with an efficiency
of 74.5% in the charging/discharging experiment at 340 cycles that
are far away below the 500 cycles. However, it is revealed that the
wireless power transmission device 30 according to the present
invention shows a highly excellent charging/discharging
efficiency.
The description proposed herein is just an exemplary embodiment for
the purpose of illustrations only, not intended to limit the scope
of the invention, so it should be understood that other equivalents
and modifications could be made thereto without departing from the
spirit and scope of the invention as apparent to those skilled in
the art. Therefore, it should be understood that the present
invention might be not defined within the scope of which is
described in detailed description but within the scope of which is
defined in the claims and their equivalents.
* * * * *