U.S. patent application number 16/520111 was filed with the patent office on 2019-11-14 for wireless power transmitting apparatus and wireless power receiving apparatus.
This patent application is currently assigned to LG INNOTEK CO., LTD.. The applicant listed for this patent is LG INNOTEK CO., LTD.. Invention is credited to Soon Young HYUN, Yun Bok LEE, Young Kil SONG.
Application Number | 20190348854 16/520111 |
Document ID | / |
Family ID | 55630861 |
Filed Date | 2019-11-14 |
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United States Patent
Application |
20190348854 |
Kind Code |
A1 |
LEE; Yun Bok ; et
al. |
November 14, 2019 |
WIRELESS POWER TRANSMITTING APPARATUS AND WIRELESS POWER RECEIVING
APPARATUS
Abstract
A wireless power transmitting apparatus can include a substrate;
a first transmitting coil and a second transmitting coil disposed
on the substrate; a third transmitting coil disposed on the first
transmitting coil and the second transmitting coil; and an adhesive
disposed between the substrate and the first and the second
transmitting coils, in which the substrate includes a first portion
disposed inside an inner circumference of the first transmitting
coil; a second portion disposed inside an inner circumference of
the second transmitting coil; a third portion disposed between the
first transmitting coil and the second transmitting coil; and a
peripheral portion disposed outside an outer circumference of the
first transmitting coil and an outer circumference of the second
transmitting coil, in which an inner area disposed inside an inner
circumference of the third transmitting coil overlaps the third
portion, a part of the first transmitting coil and a part of the
second transmitting coil in a vertical direction perpendicular to
the substrate.
Inventors: |
LEE; Yun Bok; (Seoul,
KR) ; SONG; Young Kil; (Seoul, KR) ; HYUN;
Soon Young; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LG INNOTEK CO., LTD. |
Seoul |
|
KR |
|
|
Assignee: |
LG INNOTEK CO., LTD.
Seoul
KR
|
Family ID: |
55630861 |
Appl. No.: |
16/520111 |
Filed: |
July 23, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
15515022 |
Mar 28, 2017 |
|
|
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PCT/KR2015/009462 |
Sep 8, 2015 |
|
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16520111 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01F 27/245 20130101;
H02J 50/12 20160201; H01F 27/255 20130101; H02J 50/70 20160201;
H01F 1/14733 20130101; H02J 50/005 20200101; H01F 1/26 20130101;
H01F 27/36 20130101; H01F 27/2871 20130101; H02J 50/50 20160201;
H01F 27/2804 20130101; H01F 38/14 20130101; H01F 1/20 20130101;
H02J 7/025 20130101; H01F 1/14775 20130101; H01F 1/14791
20130101 |
International
Class: |
H02J 7/02 20060101
H02J007/02; H02J 50/50 20060101 H02J050/50; H01F 1/26 20060101
H01F001/26; H01F 38/14 20060101 H01F038/14; H02J 50/12 20060101
H02J050/12; H01F 27/36 20060101 H01F027/36; H01F 27/28 20060101
H01F027/28; H01F 1/147 20060101 H01F001/147; H01F 1/20 20060101
H01F001/20; H01F 27/255 20060101 H01F027/255; H01F 27/245 20060101
H01F027/245 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 29, 2014 |
KR |
10-2014-0130529 |
Claims
1. A wireless power transmitting apparatus, comprising: a
substrate; a first transmitting coil and a second transmitting coil
disposed on the substrate; a third transmitting coil disposed on
the first transmitting coil and the second transmitting coil; and
an adhesive disposed between the substrate and the first and the
second transmitting coils, wherein the substrate comprises: a first
portion disposed inside an inner circumference of the first
transmitting coil; a second portion disposed inside an inner
circumference of the second transmitting coil; a third portion
disposed between the first transmitting coil and the second
transmitting coil; and a peripheral portion disposed outside an
outer circumference of the first transmitting coil and an outer
circumference of the second transmitting coil, wherein an inner
area disposed inside an inner circumference of the third
transmitting coil overlaps the third portion, a part of the first
transmitting coil and a part of the second transmitting coil in a
vertical direction perpendicular to the substrate, wherein the
first portion comprises a first overlapping area overlapping the
third transmitting coil in the vertical direction and a first
non-overlapping area not overlapping the third transmitting coil in
the vertical direction, and wherein the second portion comprises a
second overlapping area overlapping the third transmitting coil in
the vertical direction and a second non-overlapping area not
overlapping the third transmitting coil in the vertical
direction.
2. The wireless power transmitting apparatus of claim 1, wherein
the substrate further comprises: a guide portion disposed between
the first transmitting coil and the second transmitting coil.
3. The wireless power transmitting apparatus of claim 2, further
comprising: lead wires of the third transmitting coil, the lead
wires being disposed in the guide portion.
4. The wireless power transmitting apparatus of claim 1, wherein
the substrate further comprises: a recess on a lateral side of the
substrate.
5. The wireless power transmitting apparatus of claim 4, further
comprising: lead wires of the third transmitting coil; and
terminals of the lead wires, wherein the terminals of the lead
wires of the third transmitting coil are disposed in the
recess.
6. A wireless power transmitting apparatus, comprising: a
substrate; a first transmitting coil and a second transmitting coil
disposed on the substrate, and a third transmitting coil disposed
on the first transmitting coil and the second transmitting coil;
wherein the substrate comprises: a first portion disposed inside an
inner circumference of the first transmitting coil; a second
portion disposed inside an inner circumference of the second
transmitting coil; and a third portion disposed between the first
transmitting coil and the second transmitting coil, and wherein an
inner area disposed inside an inner circumference of the third
transmitting coil overlaps the third portion, a part of the first
transmitting coil and a part of the second transmitting coil in a
vertical direction perpendicular to the substrate.
7. The wireless power transmitting apparatus of claim 6, wherein
the substrate further comprises: a guide portion disposed between
the first transmitting coil and the second transmitting coil.
8. The wireless power transmitting apparatus of claim 7, further
comprising: lead wires of the third transmitting coil, the lead
wires being disposed in the guide portion.
9. The wireless power transmitting apparatus of claim 6, wherein
the first portion and the second portion are located outside an
outer circumference of the third transmitting coil.
10. The wireless power transmitting apparatus of claim 6, wherein
the substrate comprises a recess on a lateral side.
11. The wireless power transmitting apparatus of claim 10, further
comprising: lead wires of the third transmitting coil; and
terminals of the lead wires, wherein the terminals of the lead
wires of the third transmitting coil are disposed in the
recess.
12. The wireless power transmitting apparatus of claim 6, wherein
the substrate further comprises: a peripheral portion disposed
outside both an outer circumference of the first transmitting coil
and an outer circumference of the second transmitting coil.
13. The wireless power transmitting apparatus of claim 6, further
comprising: an adhesive between the substrate and the first and
second transmitting coils.
14. A wireless power transmitting apparatus, comprising: a
substrate; a first transmitting coil and a second transmitting coil
disposed on the substrate, and a third transmitting coil disposed
on the first transmitting coil and the second transmitting coil;
wherein the substrate comprises: a first portion disposed inside an
inner circumference of the first transmitting coil; a second
portion disposed inside an inner circumference of the second
transmitting coil; and a third portion disposed between the first
transmitting coil and the second transmitting coil, wherein the
first portion comprises a first overlapping area overlapping the
third transmitting coil in a vertical direction perpendicular to
the substrate and a first non-overlapping area not overlapping the
third transmitting coil in the vertical direction, and wherein the
second portion comprises a second overlapping area overlapping the
third transmitting coil in the vertical direction and a second
non-overlapping area not overlapping the third transmitting coil in
the vertical direction.
15. The wireless power transmitting apparatus of claim 14, wherein
the substrate further comprises: a guide portion disposed between
the first transmitting coil and the second transmitting coil.
16. The wireless power transmitting apparatus of claim 15, further
comprising: lead wires of the third transmitting coil, the lead
wires being disposed in the guide portion.
17. The wireless power transmitting apparatus of claim 14, wherein
the substrate further comprises: a recess on a lateral side of the
substrate.
18. The wireless power transmitting apparatus of claim 17, further
comprising: lead wires of the third transmitting coil; and
terminals of the lead wires, wherein the terminals of the lead
wires of the third transmitting coil are disposed in the
recess.
19. The wireless power transmitting apparatus of claim 14, wherein
the substrate further comprises: a peripheral portion disposed
outside both an outer circumference of the first transmitting coil
and an outer circumference of the second transmitting coil.
20. The wireless power transmitting apparatus of claim 14, further
comprising: an adhesive between the substrate and the first and
second transmitting coils.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation of U.S. patent
application Ser. No. 15/515,022 filed on Mar. 28, 2017, which was
filed as the National Phase of PCT International Application No.
PCT/KR2015/009462, filed on Sep. 8, 2015, which claims priority
under 35 U.S.C. 119(a) to Patent Application No. 10-2014-0130529,
filed in the Republic of Korea on Sep. 29, 2014, all of which are
hereby expressly incorporated by reference into the present
application.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present invention relates to wireless charging, and more
specifically, a wireless power transmitting apparatus and a
wireless power receiving apparatus included in a wireless charging
system.
Description of the Related Art
[0003] As wireless communications technology is continuing to
advance, wireless power transmitting/receiving technology which
wirelessly transmits power to electronic devices has started to
receive more attention. This type of wireless power
transmitting/receiving technology may be diversely applied not only
to battery charging of mobile terminals but also to delivery of
power to home appliances, electric cars, or subways.
[0004] The wireless power transmitting/receiving technology uses a
fundamental principle of magnetic induction or magnetic resonance.
In order to increase an efficiency of the power
transmission/reception, it is necessary to maintain a proper level
of inductance by increasing an effective permeability of the
wireless power transmitting/receiving apparatus.
[0005] Meanwhile, the wireless power transmitting/receiving
apparatus may include a substrate, a soft magnetic layer disposed
on the substrate and a coil disposed on the soft magnetic layer. In
this case, the coil is wound in parallel to a plane of the soft
magnetic layer. Due to a limitation related to size of the coil
which is wound, there is a limitation in regards to achieving a
desired level of the effective permeability.
[0006] In particular, there is a problem related to the wireless
power transmitting/receiving apparatus applied to a vehicle in that
it is difficult to apply a high-permeability-pellet to a soft
magnetic layer due to vibration or temperature variation
characteristics.
[0007] Moreover, due to the vibration characteristics, a
double-sided tape which is very thick should be used between the
substrate and the soft magnetic layer and between the soft magnetic
layer and the coil. Thus, there is a limitation in terms of being
able to increase the permeability by increasing the thickness of
the soft magnetic layer.
SUMMARY OF THE INVENTION
[0008] Embodiments of the present invention provide a wireless
power transmitting apparatus and a wireless power receiving
apparatus of a wireless charging system.
[0009] According to an aspect of the present invention, a wireless
power transmitting apparatus of a wireless charging system includes
a substrate, a first bonding layer formed on the substrate, a soft
magnetic layer formed on the first bonding layer, a second bonding
layer formed on the soft magnetic layer and a transmitting coil
formed on the second bonding layer, wherein at least one of the
first bonding layer and the second bonding layer includes a
magnetic substance.
[0010] At least one of the first bonding layer and the second
bonding layer may include a magnetic layer which includes a
magnetic substance, and a bonding agent which is formed on both
sides of the magnetic layer.
[0011] The magnetic layer may include at least one of a sendust, a
permalloy and MPP (Molybdenum Permalloy Powder).
[0012] A metal ribbon may be further formed between the magnetic
layer and the bonding agent.
[0013] The bonding agent may include an insulation material.
[0014] The bonding agent may include at least one of an
acrylate-based organic bonding agent, an epoxy-based organic
bonding agent and a silicon-based organic bonding agent.
[0015] At least one surface of the first bonding layer and the
second layer may be film-forming processed with an insulation
material.
[0016] The insulation material may include SiO.sub.2.
[0017] A support film may be further formed on the transmitting
coil.
[0018] The soft magnetic layer may include a composite comprising
any one of single metal powder/flakes or alloy powder/flakes and a
polymer resin.
[0019] The alloy powder/flakes may be Fe, Co and Ni alloy
powder/flakes or Fe, Si and Cr alloy powder/flakes.
[0020] The polymer resin may include at least one of a PV
(polyvinyl)-based resin, a PE (polyethylene)-based resin and a PP
(polypropylene)-based resin.
[0021] According to an aspect of the present invention, the
wireless power receiving apparatus of the wireless charging system
includes a substrate, a first bonding layer formed on the
substrate, a soft magnetic layer formed on the first bonding layer,
a second bonding layer formed on the soft magnetic layer, and a
receiving coil formed on the second bonding layer, wherein at least
one of the first bonding layer and the second bonding layer
includes a magnetic substance.
[0022] According to an aspect of the present invention, the bonding
layer of the wireless power transmitting apparatus or the wireless
power receiving apparatus of the wireless charging system includes
a magnetic layer including a magnetic substance, and a bonding
agent formed on both sides of the magnetic layer.
[0023] According to an embodiment of the invention, it may be
possible to increase the effective permeability of the wireless
power transmitting apparatus and the wireless power receiving
apparatus, and to increase the inductance of the wireless power
transmitting apparatus and the wireless power receiving apparatus.
Therefore, the efficiency of power transmitting/receiving between
the wireless power transmitting apparatus and the wireless power
receiving apparatus can be increased.
[0024] In particularly, it may be possible to obtain a wireless
power transmitting apparatus that can also be stably applied to a
vehicle in which there are vibration and temperature variation
characteristics.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 is a diagram of a wireless charging system according
to an embodiment of the present invention;
[0026] FIG. 2 is a view illustrating a method of wireless power
transmission and reception for a wireless charging system according
to an embodiment of the present invention;
[0027] FIG. 3 is an equivalent circuit diagram of a transmitting
coil according to an embodiment of the present invention;
[0028] FIG. 4 is an equivalent circuit diagram of a power source
and a wireless power transmitting apparatus according to an
embodiment of the present invention;
[0029] FIG. 5 is an equivalent circuit diagram of a wireless power
receiving apparatus according to an embodiment of the present
invention;
[0030] FIG. 6 is a top view of a soft magnetic layer and a
transmitting coil included in a wireless power transmitting
apparatus according to an embodiment of the present invention;
[0031] FIG. 7 is a top view of a soft magnetic layer and a
transmitting coil included in a wireless power transmitting
apparatus according to another embodiment of the present
invention;
[0032] FIG. 8 is a cross-sectional view of a wireless power
transmitting apparatus according to an embodiment of the present
invention;
[0033] FIG. 9 is a cross-sectional view of a bonding layer included
in a wireless power transmitting apparatus according to an
embodiment of the present invention;
[0034] FIG. 10 is a graph, when a bonding layer does not include a
magnetic substance, explaining an increasing rate of inductance
based on an increase in permeability thereof, and FIG. 11 is a
graph, when a bonding layer does not include a magnetic substance,
explaining an increasing rate of inductance based on an increase in
a thickness thereof;
[0035] FIG. 12 is a graph, when a bonding layer includes a magnetic
substance, explaining an increasing rate of inductance based on an
increase in thickness thereof.
DETAILED DESCRIPTION OF THE INVENTION
[0036] While the invention can allow various modifications and
alternative embodiments, specific embodiments thereof are shown by
way of example in the drawings and will be described. However, it
should be understood that there is no intention to limit the
invention to the particular embodiments disclosed, but on the
contrary, the invention is to cover all modifications, equivalents,
and alternatives falling within the spirit and scope of the
invention.
[0037] It will be understood that although the terms including
ordinal numbers such as "first," "second," etc. may be used herein
to describe various elements, these elements are not limited by
these terms. These terms are only used to distinguish one element
from another. For example, a second element could be termed a first
element without departing from the teachings of the present
inventive concept, and similarly a first element could be also
termed a second element. The term "and/or" includes any and all
combination of one or more of the related listed items.
[0038] When an element is referred to as being "connected to" or
"coupled with" another element, not only it can be directly
connected or coupled to the other element, but also it can be
understood that intervening elements may be present. In contrast,
when an element is referred to as being "directly connected to" or
"directly coupled with" another element, there are no intervening
elements present.
[0039] The terminology used herein is for the purpose of describing
particular embodiments only and is not intended to limit the
present inventive concept. As used herein, the singular forms "a,"
"an," and "the" are intended to include the plural forms as well,
unless the context clearly indicates otherwise. It will be further
understood that the terms "comprises" and/or "comprising," when
used in this specification, specify the presence of stated
features, integers, steps, operations, elements, and/or components,
but do not preclude the presence or addition of one or more other
features, integers, steps, operations, elements, components, and/or
groups thereof.
[0040] Unless otherwise defined, all terms including technical and
scientific terms used herein have the same meaning as commonly
understood by one of ordinary skill in the art to which this
inventive concept belongs. It will be further understood that
terms, such as those defined in commonly used dictionaries, should
be interpreted as having a meaning that is consistent with their
meaning in the context of the relevant art and will not be
interpreted in an idealized or overly formal sense unless expressly
so defined herein.
[0041] Hereinafter, embodiments of the present invention will be
described in detail with reference to the accompanying drawings,
and regardless of the numbers in the drawings, the same or
corresponding elements will be assigned with the same numbers and
overlapping descriptions will be omitted.
[0042] FIG. 1 is a diagram of a wireless charging system according
to an embodiment of the present invention.
[0043] Referring to FIG. 1, a wireless charging system 10 includes
a power source 100, a wireless power transmitting apparatus 200, a
wireless power receiving apparatus 300, and a load terminal
400.
[0044] The wireless power transmitting apparatus 200 is connected
to the power source 100 and receives power from the power source
100. Further, the wireless power transmitting apparatus 200
wirelessly transmits power to the wireless power receiving
apparatus 300. In this case, the wireless power transmitting
apparatus 200 may transmit power using an electromagnetic induction
method or a resonance method. Although the power source 100 and the
wireless power transmitting apparatus 200 are illustrated as
separated elements, the structure is not limited thereto. The power
source 100 may be included in the wireless power transmitting
apparatus 200.
[0045] The wireless power receiving apparatus 300 wirelessly
receives power from the wireless power transmitting apparatus 200.
The wireless power receiving apparatus 300 may also receive power
using the electromagnetic induction method or the resonance method.
Further, the wireless power receiving apparatus 300 provides the
received power to the load terminal 400.
[0046] FIG. 2 is a view illustrating a method of wireless power
transmission and reception for a wireless charging system according
to an embodiment of the present invention.
[0047] Referring to FIG. 2, the wireless power transmitting
apparatus 200 may include a transmitting coil 210. The wireless
power receiving apparatus 300 may include a receiving coil 310 and
a rectifying unit 320.
[0048] The power source 100 may generate an alternating current
(AC) power having a predetermined frequency and supply it to the
transmitting coil 210 of the wireless power transmitting apparatus
200.
[0049] Further, the alternating current generated by the
transmitting coil 210 may be delivered to the receiving coil 310,
which is inductively coupled to the transmitting coil 210. On the
other hand, the power delivered to the transmitting coil 201 may be
delivered to the wireless power receiving apparatus 300 having the
same resonance frequency as the wireless power transmitting
apparatus 200 through a frequency resonance method. The power may
be transferred between two impedance matched LC circuits through
resonance.
[0050] The power which is delivered to the receiving coil 310 using
the electromagnetic induction manner or the resonance method may be
rectified through the rectifying unit 320 and delivered to the load
terminal 400.
[0051] FIG. 3 is an equivalent circuit diagram of a transmitting
coil according to an embodiment of the present invention.
[0052] Referring to FIG. 3, the transmitting coil 210 includes an
inductor L1 and a capacitor C1, and either end of the inductor L1
may be connected to either end of the capacitor C1.
[0053] Here, the capacitor C1 may be a variable capacitor, and
impedance matching may be performed as a capacitance of the
capacitor C1 is adjusted. Although an equivalent circuit diagram of
the receiving coil 310 may also be similar to the equivalent
circuit diagram of the transmitting coil 210, the structure is not
limited thereto.
[0054] FIG. 4 is an equivalent circuit diagram of a power source
and a wireless power transmitting apparatus according to an
embodiment of the present invention.
[0055] Referring to FIG. 4, the transmitting coil 210 may include
the inductor L1 having an inductance value and the capacitor C1
having a capacitor value.
[0056] FIG. 5 is an equivalent circuit diagram of a wireless power
receiving apparatus according to an embodiment of the present
invention.
[0057] Referring to FIG. 5, the receiving coil 310 may include an
inductor L2 having an inductance value and a capacitor C2 having a
capacitance value.
[0058] The rectifying unit 320 may convert the alternating current
power delivered from the receiving coil 310 into a direct current
(DC) power, and deliver the converted direct current power to the
load terminal 400.
[0059] Specifically, the rectifying unit 320 may include a
rectifier and a smoothing circuit, although they are not shown in
the drawings. Although the rectifier (e.g., it may be a silicon
rectifier) may be equivalently represented as a diode D1, the
rectifier is not limited thereto. The rectifier may convert the
alternating current power delivered from the receiving coil 310
into a direct current power. The smoothing circuit may remove an
alternating element included in the DC power converted in the
rectifier and output smooth DC power. Although, the smoothing
circuit, for example, may be equivalently represented as a
capacitor C3, the smoothing circuit is not limited thereto.
[0060] The load terminal 400 may be a battery or a device with a
built-in battery.
[0061] Meanwhile, the quality factor possesses an important meaning
in terms of wireless power transmission. The quality factor (Q)
indicates an index of energy which may be accumulated around the
wireless power transmitting apparatus 200 or the wireless power
receiving apparatus 300. The quality factor (Q) may vary depending
on an operating frequency (w), a shape, a size, a material, etc. of
a coil, and may be represented by the following Equation 1.
Q=w*Ls/Rs [Equation 1]
[0062] Here, Ls is a coil inductance, and Rs indicates a resistance
corresponding to a power loss occurring in the coil itself.
[0063] The quality factor may have a value from 0 to infinity, and
as the quality factor becomes greater, it may be assumed that
efficiency of power transmission between the wireless power
transmitting apparatus 200 and the wireless power receiving
apparatus 300 increases.
[0064] According to an embodiment of the present invention,
increase of coil inductance is intended by including a magnetic
substance in a bonding layer.
[0065] FIG. 6 is a top view of a soft magnetic layer and a
transmitting coil included in a wireless power transmitting
apparatus according to an embodiment of the present invention.
[0066] Referring to FIG. 6, a transmitting coil 610 is formed on a
soft magnetic layer 600. The transmitting coil 610 may be in a wire
wound shape such as a spiral or a helical shape on a plane.
Although the transmitting coil 610 may have a round shape, a
racetrack shape, a rectangular shape, a triangular shape, or a
polygonal shape which has rounded corners, the transmitting coil
610 is not limited to these shapes thereto.
[0067] FIG. 7 is a top view of a soft magnetic layer and a
transmitting coil included in a wireless power transmitting
apparatus according to another embodiment of the present
invention.
[0068] Referring to FIG. 7, transmitting coils 710, 720 and 730 are
formed on a soft magnetic layer 700. Each transmitting coil 710,
720 and 730 may be in a wire wound shape such as a spiral or a
helical shape on a plane. Although each transmitting coil 710, 720
and 730 may be in a round shape, a racetrack shape, a rectangular
shape, a triangular shape or a polygonal shape which has rounded
corners, the shapes are not limited thereto. The transmitting coil
710 and the transmitting coil 720 are disposed in parallel, and the
transmitting coil 730 may be disposed on the transmitting coil 710
and the transmitting coil 720.
[0069] FIG. 8 is a cross-sectional view of a wireless power
transmitting apparatus according to an embodiment of the present
invention, and FIG. 9 is a cross-sectional view of a bonding layer
included in a wireless power transmitting apparatus according to an
embodiment of the present invention.
[0070] Referring to FIG. 8, a wireless power transmitting apparatus
800 includes a substrate 810, a first bonding layer 820 formed on
the substrate 810, a soft magnetic layer 830 formed on the first
bonding layer 820, a second bonding layer 840 formed on the soft
magnetic layer 830 and a transmitting coil 850 formed on the second
bonding layer 840.
[0071] The substrate 810 may be a plastic material substrate or a
metal material substrate. The substrate 810 may also be a PCB
(Printed Circuit Board). The substrate 810 may be a case of the
wireless power transmitting apparatus 800. Thus, the substrate 810
may be used with an instrument.
[0072] The soft magnetic layer 830 may be embodied in various forms
such as a pellet, a plate, a sheet, a ribbon, a foil, a film, a
composite, etc. However, when the wireless power transmitting
apparatus 800 is applied to a vehicle, the pellet is difficult to
use due to vibration or temperature characteristics of vehicles.
Thus, the soft magnetic layer 830 may include a composite
comprising a single metal or an alloy powder/flakes and a polymer
resin. Here, although the alloy powder/flakes may include at least
one of Fe, Co and Ni alloy powder/flakes and Fe, Si and Cr alloy
powder/flakes, they are not limited thereto. Further, although the
polymer resin may include at least one of a PV (polyvinyl)-based
resin, a PE (polyethylene)-based resin and a PP
(polypropylene)-based resin, the polymer resin is not limited
thereto. In this case, the soft magnetic layer 830 may include 90
wt % or more of an alloy powder/flakes, and 10 wt % or less of a
polymer resin.
[0073] The transmitting coil 850 is formed on the soft magnetic
layer 830. The coil 850 may be wound in a direction parallel to a
plane of the soft magnetic layer 830 on the soft magnetic layer
830. Although it is not shown, a support film may further be formed
on the transmitting coil 850. The support film is for supporting
the transmitting coil 850, and it may include a PET (polyethylene
terephthalate) material.
[0074] Meanwhile, the first bonding layer 820 is formed between the
substrate 810 and the soft magnetic layer 830, and bonds the
substrate 810 and the soft magnetic layer 830 together. Further,
the second bonding layer 840 is formed between the soft magnetic
layer 830 and the transmitting coil 850, and bonds the soft
magnetic layer 830 and the transmitting coil 850 together. In this
case, at least one of the first bonding layer 820 and the second
bonding layer 840 includes a magnetic substance. When at least one
of the first bonding layer 820 and the second bonding layer 840
includes a magnetic substance, the effective permeability of the
wireless power transmitting apparatus 800 may increase, and the
inductance may increase.
[0075] Referring to FIG. 9, at least one of the first bonding layer
820 and the second bonding layer 840 includes a magnetic layer 900
and a bonding agent 910 formed on both sides of the magnetic
layer.
[0076] The magnetic layer 900 may be a magnetic sheet, a magnetic
film, a magnetic foil, etc. that includes a magnetic substance with
high permeability. Here, although the magnetic substance with a
high permeability may, for example, be a sendust, a permalloy, a
MPP (Molybdenum Permalloy Powder), etc., the magnetic substance
with high permeability is not limited thereto. The sendust refers
to a Fe--Si--Al ternary alloy. The permalloy refers to a Ni--Fe
binary alloy. Accordingly, an initial permeability of the magnetic
layer 900 may be 500.mu.' or more, and the difference in the
initial permeability between the magnetic layer and the soft
magnetic layer 830 may be 100.mu.' or more at a range of 100 to 300
kHz. Here, the magnetic layer 900 may replace a dielectric
substance film substrate of a general double-sided tape, which
bonds the substrate 810 and the soft magnetic layer 830 or the soft
magnetic layer 830 and the coil 850. Accordingly, without
increasing an overall thickness of the wireless power transmitting
apparatus or the wireless power receiving apparatus, it may be
possible to increase effective permeability, and to increase
inductance.
[0077] In this case, a metal ribbon may further be formed between
the magnetic layer 900 and the bonding agent 910. Here, the metal
ribbon may refer to a thin film which is made by spreading out a
metal very slightly in a single atomic unit. Since the permeability
of the metal ribbon is very high, without increasing an overall
thickness of the wireless power transmitting apparatus, it may be
possible to further increase effective permeability, and to
increase inductance.
[0078] Meanwhile, when permeability of the magnetic layer 900 is
higher than that of the soft magnetic layer 830, an electromagnetic
component may be compensated due to a current conducted between the
first bonding layer 820 or the second bonding layer 840 and the
soft magnetic layer 830. Accordingly, the bonding agent 910 may
include an insulation material. For instance, the bonding agent 910
may include an acrylate-based organic bonding agent, an epoxy-based
organic bonding agent, a silicon-based organic bonding agent,
etc.
[0079] In other cases, a surface of the first bonding layer 820 or
the second bonding layer 840 may be film-forming processed with
SiO.sub.2 or the like. Accordingly, the soft magnetic layer 830 may
be insulated from the first bonding layer 820 or the second bonding
layer 840.
[0080] Hereinafter, a test result related to inductance of a
wireless power transmitting apparatus according to an embodiment of
the present invention is explained.
[0081] FIG. 10 is a graph, when a bonding layer does not include a
magnetic substance, explaining an increasing rate of inductance
according to an increase in permeability thereof, and FIG. 11 is a
graph, when a bonding layer does not include a magnetic substance,
explaining an increasing rate of inductance according to an
increase in thickness thereof.
[0082] Referring to FIG. 10 and FIG. 11, the inductance increases
up to a certain level as permeability (.mu.') or thickness
increases; however, when the inductance arrives at the certain
level, it does not increase anymore, but rather is saturated.
[0083] FIG. 12 is a graph, when a bonding layer includes a magnetic
substance, explaining an increasing rate of inductance according to
an increase in thickness thereof.
[0084] Here, a substrate, a soft magnetic layer and a coil are
laminated in a sequence, and a bonding layer is formed between the
substrate and the soft magnetic layer and between the soft magnetic
layer and the coil. A soft magnetic layer which has permeability
(.mu.) of 26 and a thickness of 2.0 mm is used, and a bonding layer
between the soft magnetic layer and a coil is fixed at a thickness
of 0.1 mm.
[0085] After measuring inductance when a bonding layer does not
include a magnetic substance (normal), i.e. when using a general
double-sided tape in which a bonding agent is formed on both sides
of a substrate made by an dielectric film, the inductance was
measured while increasing the thickness of a bonding layer from 0.1
mm to 0.4 mm, wherein the bonding layer included a magnetic
substance of which permeability (.mu.) was 500 and a thickness
ratio of a magnetic layer and a bonding agent was 7:3.
[0086] As shown in FIG. 12, when the bonding layer includes the
magnetic substance (approximately 11.4), it can be found that the
inductance is higher than the case that the bonding layer does not
include a magnetic substance (approximately 11.2). Further, it can
be found that even if a bonding layer including a magnetic
substance becomes thicker, the inductance thereof is not saturated,
but rather it increases continuously.
[0087] Thus, according to an embodiment of the present invention, a
wireless power transmitting apparatus having high inductance may be
achieved. Moreover, a desired level of inductance may be achieved
by adjusting the thickness of a bonding layer.
[0088] Hereinabove, for the sake of providing a convenient
description, although a wireless power transmitting apparatus is
described by way of examples, the invention is not limited thereto.
Embodiments of the present invention may also be equally applied to
a bonding layer which is formed between a substrate, a soft
magnetic layer and a coil of a wireless power receiving apparatus.
Further, when a wireless power receiving apparatus has a WPC
function and NFC function simultaneously, a NFC coil may be further
laminated onto a soft magnetic layer. The NFC coil may be
configured to surround an outer circumference of a receiving
coil.
[0089] Although exemplary embodiments of the present invention have
been referenced and described above, it will be understood that it
is possible for those of ordinary skill in the art to implement
modifications and variations on the present invention without
departing from the concept and scope of the present invention
listed in the following appended claims.
DESCRIPTION OF REFERENCE NUMERALS
[0090] 10: a wireless charging system [0091] 100: a power source
[0092] 200: a wireless power transmitting apparatus [0093] 300: a
wireless power receiving apparatus [0094] 810: a substrate [0095]
820 and 840: a bonding layer [0096] 830: a soft magnetic layer
[0097] 850: a coil
* * * * *