U.S. patent application number 16/762815 was filed with the patent office on 2021-06-17 for data transmitting circuit, data receiving circuit and data transferring apparatus.
The applicant listed for this patent is TENDYRON CORPORATION. Invention is credited to Dongsheng LI.
Application Number | 20210184717 16/762815 |
Document ID | / |
Family ID | 1000005435982 |
Filed Date | 2021-06-17 |
United States Patent
Application |
20210184717 |
Kind Code |
A1 |
LI; Dongsheng |
June 17, 2021 |
DATA TRANSMITTING CIRCUIT, DATA RECEIVING CIRCUIT AND DATA
TRANSFERRING APPARATUS
Abstract
The present invention provides a data transmitting circuit, a
data receiving circuit and a data transferring apparatus. In one of
the implementations of the data transmitting circuit, the first end
of the primary coil of a transformer is connected to a first power
supply interface, and the second end of the primary coil of the
transformer is connected to the first end of a current limiting
module and the first end of a first capacitor respectively; the
first end of the secondary coil of the transformer is connected to
a second power supply interface, and the second end of the
secondary coil of the transformer is connected to a transmitting
interface; the second end of the current limiting module and the
second end of the first capacitor are both connected to the input
end of a switch module.
Inventors: |
LI; Dongsheng; (Beijing,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TENDYRON CORPORATION |
Beijing |
|
CN |
|
|
Family ID: |
1000005435982 |
Appl. No.: |
16/762815 |
Filed: |
November 27, 2018 |
PCT Filed: |
November 27, 2018 |
PCT NO: |
PCT/CN2018/117673 |
371 Date: |
May 8, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04B 1/40 20130101; H04B
1/04 20130101; H04W 76/27 20180201 |
International
Class: |
H04B 1/40 20060101
H04B001/40; H04B 1/04 20060101 H04B001/04 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 1, 2017 |
CN |
201711249309.4 |
Dec 1, 2017 |
CN |
201711251098.8 |
Claims
1. A data transmitting circuit, comprising: a first power supply
interface configured to provide a first direct voltage, a second
power supply interface configured to provide a second direct
voltage, a transmitting interface, a master control chip, a
transformer, a current limiting module, a first capacitor and a
switch module; wherein, a first end of a primary coil of the
transformer is connected to the first power supply interface, a
second end of the primary coil of the transformer is connected to a
first end of the current limiting module and a first end of the
first capacitor respectively, a first end of a secondary coil of
the transformer is connected to the second power supply interface,
and a second end of the secondary coil of the transformer is
connected to the transmitting interface; and a second end of the
current limiting module and a second end of the first capacitor are
connected to an input end of the switch module; or, the first end
of the primary coil of the transformer is connected to the first
end of the current limiting module and the first end of the first
capacitor respectively, the second end of the current limiting
module and the second end of the first capacitor are connected to
the first power supply interface, the second end of the primary
coil of the transformer is connected to the input end of the switch
module, the first end of the secondary coil of the transformer is
connected to the second power supply interface, and the second end
of the secondary coil of the transformer is connected to the
transmitting interface; an output end of the switch module is
grounded, and a control end of the switch module is connected to
the master control chip; the master control chip is configured to
transmit a control signal to the control end of the switch module
when the data transmitting circuit transmits a data signal to the
transmitting interface; and the switch module is configured to
switch on or off a circuit path between the input end and the
output end of the switch module when receiving the control signal
transmitted by the master control chip.
2. The data transmitting circuit of claim 1, wherein the current
limiting module comprises a first resistor, and the switch module
comprises a MOS transistor or a triode.
3. A data receiving circuit, comprising: a receiving interface, a
first voltage dividing module, a voltage reduction module, a second
voltage dividing module, a second capacitor, a filtering module, a
comparator, and a master control chip; wherein a first end of the
first voltage dividing module and a first end of the second
capacitor are connected to the receiving interface; a second end of
the first voltage dividing module and a second end of the second
capacitor are connected to a first common connection end, the first
common connection end is connected to an input end of the filtering
module, an output end of the filtering module is connected to a
negative input end of the comparator, and a ground end of the
filtering module is grounded; the first common connection end is
further connected to an input end of the voltage reduction module;
an output end of the voltage reduction module is connected to a
second common connection end, and the second common connection end
is connected to a positive input end of the comparator; the second
common connection end is further connected to a first end of the
second voltage dividing module; a second end of the second voltage
dividing module is grounded; the comparator is configured to
compare a voltage of the positive input end with a voltage of the
negative input end when the data receiving circuit receives a data
signal through the receiving interface, and to output a comparison
result signal to the master control chip through an output end of
the comparator; the master control chip is connected to the output
end of the comparator, and configured to receive the comparison
result signal output from the output end of the comparator.
4. The data receiving circuit of claim 3, wherein the first voltage
dividing module comprises a second resistor, the voltage reduction
module comprises a diode, and the second voltage dividing module
comprises a third resistor.
5. The data receiving circuit of claim 3, wherein the filtering
module comprises: a fourth resistor and a third capacitor; a first
end of the fourth resistor is connected to the input end of the
filtering module, and a second end of the fourth resistor is
connected to the output end of the filtering module; and a first
end of the third capacitor is connected to the output end of the
filtering module, and a second end of the third capacitor is
connected to the ground end of the filtering module.
6-7. (canceled)
8. A data transferring apparatus, comprising a data transmitting
circuit and a data receiving circuit, wherein, the data
transmitting circuit comprises: a first Power supply interface
configured to provide a first direct voltage, a second power supply
interface configured to provide a second direct voltage, a
transmitting interface, a master control chip, a transformer, a
current limiting module, a first capacitor and a switch module; in
which, a first end of a primary coil of the transformer is
connected to the first Power supply interface, a second end of the
primary coil of the transformer is connected to a first end of the
current limiting module and a first end of the first capacitor
respectively, a first end of a secondary coil of the transformer is
connected to the second Power supply interface, and a second end of
the secondary coil of the transformer is connected to the
transmitting interface and a second end of the current limiting
module and a second end of the first capacitor are connected to an
input end of the switch module: or, the first end of the primary
coil of the transformer is connected to the first end of the
current limiting module and the first end of the first capacitor
respectively, the second end of the current limiting module and the
second end of the first capacitor are connected to the first Power
supply interface, the second end of the primary coil of the
transformer is connected to the input end of the switch module, the
first end of the secondary coil of the transformer is connected to
the second Power supply interface, and the second end of the
secondary coil of the transformer is connected to the transmitting
interface an output end of the switch module is grounded, and a
control end of the switch module is connected to the master control
chip; the master control chip is configured to transmit a control
signal to the control end of the switch module when the data
transmitting circuit transmits a data signal to the transmitting
interface; and the switch module is configured to switch on or off
a circuit path between the input end and the output end of the
switch module when receiving the control signal transmitted by the
master control chip; and the data receiving circuit comprises: a
receiving interface, a first voltage dividing module, a voltage
reduction module, a second voltage dividing module, a second
capacitor, a filtering module, a comparator, and a master control
chip; in which, a first end of the first voltage dividing module
and a first end of the second capacitor are connected to the
receiving interface; a second end of the first voltage dividing
module and a second end of the second capacitor are connected to a
first common connection end, the first common connection end is
connected to an input end of the filtering module, an output end of
the filtering module is connected to a negative input end of the
comparator, and a ground end of the filtering module is grounded;
the first common connection end is further connected to an input
end of the voltage reduction module; an output end of the voltage
reduction module is connected to a second common connection end,
and the second common connection end is connected to a positive
input end of the comparator; the second common connection end is
further connected to a first end of the second voltage dividing
module; a second end of the second voltage dividing module is
grounded: the comparator is configured to compare a voltage of the
positive input end with a voltage of the negative input end when
the data receiving circuit receives a data signal through the
receiving interface, and to output a comparison result signal to
the master control chip through an output end of the comparator;
the master control chip is connected to the output end of the
comparator, and configured to receive the comparison result signal
output from the output end of the comparator.
9. The apparatus of claim 8, wherein the transmitting interface and
the receiving interface are located in one interface.
10. The apparatus of claim 8, wherein the transmitting interface is
separated from the receiving interface.
11. The data transmitting circuit of claim 1, wherein the data
transmitting circuit is included in a data transmitting
apparatus.
12. The data receiving circuit of claim 3, wherein the data
receiving circuit is included in a data receiving apparatus.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present application is a US national phase application
of International Application No. PCT/CN2018/117673, filed on Nov.
27, 2018, which claims priorities to Chinese Patent Application No.
201711249309.4, entitled "Data Transmitting Circuit and Apparatus,
and Data Receiving Circuit and Apparatus", filed with China
National Intellectual Property Administration on Dec. 1, 2017 by
TENDYRON CORPORATION and Chinese Patent Application No.
201711251098.8, entitled "Data Transmitting Circuit and Apparatus"
filed with China National Intellectual Property Administration on
Dec. 1, 2017 by TENDYRON CORPORATION.
FIELD
[0002] The present disclosure relates to the field of electronic
technologies, and more particularly, to a data transmitting
circuit, a data receiving circuit and a data transferring
apparatus.
BACKGROUND
[0003] At present, when implementing medium-distance signal
transmission, there is usually a certain distance between the
location of a data transmitting apparatus and the location of a
data receiving apparatus. Consequently, whether a data transmitting
circuit and a data receiving circuit are properly designed will
affect stability and quality of signal transmission.
SUMMARY
[0004] The present disclosure aims at providing a new type of data
transmitting circuit and data receiving circuit.
[0005] Embodiments of the present disclosure provide a data
transmitting circuit, including: a first power supply interface
configured to provide a first direct voltage, a second power supply
interface configured to provide a second direct voltage, a
transmitting interface, a master control chip, a transformer, a
current limiting module, a first capacitor and a switch module; in
which, a first end of a primary coil of the transformer is
connected to the first power supply interface, a second end of the
primary coil of the transformer is connected to a first end of the
current limiting module and a first end of the first capacitor
respectively, a first end of a secondary coil of the transformer is
connected to the second power supply interface, and a second end of
the secondary coil of the transformer is connected to the
transmitting interface; and a second end of the current limiting
module and a second end of the first capacitor are connected to an
input end of the switch module; or, the first end of the primary
coil of the transformer is connected to the first end of the
current limiting module and the first end of the first capacitor
respectively, the second end of the current limiting module and the
second end of the first capacitor are connected to the first power
supply interface, the second end of the primary coil of the
transformer is connected to the input end of the switch module, the
first end of the secondary coil of the transformer is connected to
the second power supply interface, and the second end of the
secondary coil of the transformer is connected to the transmitting
interface; an output end of the switch module is grounded, and a
control end of the switch module is connected to the master control
chip; the master control chip is configured to transmit a control
signal to the control end of the switch module when the data
transmitting circuit transmits a data signal to the transmitting
interface; and the switch module is configured to switch on or off
a circuit path between the input end and the output end of the
switch module when receiving the control signal transmitted by the
master control chip.
[0006] Embodiments of the present disclosure provide a data
receiving circuit, including: a receiving interface, a first
voltage dividing module, a voltage reduction module, a second
voltage dividing module, a second capacitor, a filtering module, a
comparator, and a master control chip; in which a first end of the
first voltage dividing module and a first end of the second
capacitor are connected to the receiving interface; a second end of
the first voltage dividing module and a second end of the second
capacitor are connected to a first common connection end, the first
common connection end is connected to an input end of the filtering
module, an output end of the filtering module is connected to a
negative input end of the comparator, and a ground end of the
filtering module is grounded; the first common connection end is
connected to an input end of the voltage reduction module; an
output end of the voltage reduction module is connected to a second
common connection end, and the second common connection end is
connected to a positive input end of the comparator; the second
common connection end is connected to a first end of the second
voltage dividing module; a second end of the second voltage
dividing module is grounded; the comparator is configured to
compare a voltage of the positive input end with a voltage of the
negative input end when the data receiving circuit receives a data
signal through the receiving interface, and to output a comparison
result signal to the master control chip through an output end of
the comparator; the master control chip is connected to the output
end of the comparator, and configured to receive the comparison
result signal output from the output end of the comparator.
[0007] Embodiments of the present disclosure provide a data
transferring apparatus, including a data transmitting circuit and a
data receiving circuit. The data transmitting circuit may include:
a first power supply interface configured to provide a first direct
voltage, a second power supply interface configured to provide a
second direct voltage, a transmitting interface, a master control
chip, a transformer, a current limiting module, a first capacitor
and a switch module; in which, a first end of a primary coil of the
transformer is connected to the first power supply interface, a
second end of the primary coil of the transformer is connected to a
first end of the current limiting module and a first end of the
first capacitor respectively, a first end of a secondary coil of
the transformer is connected to the second power supply interface,
and a second end of the secondary coil of the transformer is
connected to the transmitting interface; and a second end of the
current limiting module and a second end of the first capacitor are
connected to an input end of the switch module; or, the first end
of the primary coil of the transformer is connected to the first
end of the current limiting module and the first end of the first
capacitor respectively, the second end of the current limiting
module and the second end of the first capacitor are connected to
the first power supply interface, the second end of the primary
coil of the transformer is connected to the input end of the switch
module, the first end of the secondary coil of the transformer is
connected to the second power supply interface, and the second end
of the secondary coil of the transformer is connected to the
transmitting interface; an output end of the switch module is
grounded, and a control end of the switch module is connected to
the master control chip; the master control chip is configured to
transmit a control signal to the control end of the switch module
when the data transmitting circuit transmits a data signal to the
transmitting interface; and the switch module is configured to
switch on or off a circuit path between the input end and the
output end of the switch module when receiving the control signal
transmitted by the master control chip. The data receiving circuit
may include: a receiving interface, a first voltage dividing
module, a voltage reduction module, a second voltage dividing
module, a second capacitor, a filtering module, a comparator, and a
master control chip; in which, a first end of the first voltage
dividing module and a first end of the second capacitor are
connected to the receiving interface; a second end of the first
voltage dividing module and a second end of the second capacitor
are connected to a first common connection end, the first common
connection end is connected to an input end of the filtering
module, an output end of the filtering module is connected to a
negative input end of the comparator, and a ground end of the
filtering module is grounded; the first common connection end is
further connected to an input end of the voltage reduction module;
an output end of the voltage reduction module is connected to a
second common connection end, and the second common connection end
is connected to a positive input end of the comparator; the second
common connection end is further connected to a first end of the
second voltage dividing module; a second end of the second voltage
dividing module is grounded; the comparator is configured to
compare a voltage of the positive input end with a voltage of the
negative input end when the data receiving circuit receives a data
signal through the receiving interface, and to output a comparison
result signal to the master control chip through an output end of
the comparator; the master control chip is connected to the output
end of the comparator, and configured to receive the comparison
result signal output from the output end of the comparator.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to clearly illustrate technical solutions of
embodiments of the present disclosure, a brief description of
drawings used in embodiments is given below. Obviously, the
drawings in the following descriptions are only part embodiments of
the present disclosure, and for those skilled in the art, other
drawings can be obtained according to these drawings without
creative labor.
[0009] FIG. 1 is a schematic diagram of a data transmitting circuit
according to an embodiment of the present disclosure.
[0010] FIG. 2 is a schematic diagram of a data transmitting circuit
according to another embodiment of the present disclosure.
[0011] FIG. 3 is another schematic diagram of the data transmitting
circuit as shown in FIG. 1 according to an embodiment of the
present disclosure.
[0012] FIG. 4 is another schematic diagram of the data transmitting
circuit as shown in FIG. 2 according to an embodiment of the
present disclosure.
[0013] FIG. 5 is a schematic diagram of a data receiving circuit
according to an embodiment of the present disclosure.
[0014] FIG. 6 is another schematic diagram of a data receiving
circuit according to an embodiment of the present disclosure.
DETAILED DESCRIPTION
[0015] In the following, the technical solutions in the embodiments
of the present disclosure will be clearly and completely described
with reference to the accompanying drawings in the embodiments of
the present disclosure. Obviously, the described embodiments are
only a part of the embodiments of the present disclosure, rather
than all the embodiments. Based on the embodiments of the present
disclosure, all other embodiments obtained by a person skilled in
the art without creative labor shall fall within the protection
scope of the present disclosure.
[0016] The embodiments of the present disclosure will be described
in detail below with reference to the accompanying drawings.
[0017] An embodiment provides a data transmitting circuit. As shown
in FIG. 1, the data transmitting circuit includes: a first power
supply interface configured to provide a first direct voltage, a
second power supply interface configured to provide a second direct
voltage, a transmitting interface, a master control chip, a
transformer T1, a current limiting module, a first capacitor C1 and
a switch module.
[0018] A first end (pin 1 of T1) of a primary coil of the
transformer (T1) is connected to the first power supply interface,
a second end (pin 2 of T1) of the primary coil of the transformer
(T1) is respectively connected to a first end of the current
limiting module and a first end of the first capacitor (C), a first
end (pin 3 of T1) of a secondary coil of the transformer (T1) is
connected to the second power supply interface, and a second end
(pin 4 of T1) of the secondary coil of the transformer (T1) is
connected to the transmitting interface.
[0019] A second end of the current limiting module and a second end
of the first capacitor (C1) are connected to an input end of the
switch module.
[0020] An output end of the switch module is grounded (GND), and a
control end of the switch module is connected to the master control
chip.
[0021] The master control chip is configured to transmit a control
signal to the control end of the switch module when the data
transmitting circuit transmits a data signal to the transmitting
interface.
[0022] The switch module is configured to switch on or off a
circuit path between the input end and the output end of the switch
module when receiving the control signal transmitted by the master
control chip.
[0023] Another embodiment of the present disclosure provides a data
transmitting circuit. As shown in FIG. 2, the data transmitting
circuit includes: the first power supply interface configured to
provide the first direct voltage, the second power supply interface
configured to provide the second direct voltage, the transmitting
interface, the master control chip, the transformer T1, the current
limiting module, the first capacitor C1 and the switch module.
[0024] The first end (pin 1 of T1) of the primary coil of the
transformer (T1) is respectively connected to the first end of the
current limiting module and the first end of the first capacitor
(C1), the second end of the current limiting module and the second
end of the first capacitor (C1) are connected to the first power
supply interface, the second end (pin 2 of T1) of the primary coil
of the transformer (T1) is connected to the input end of the switch
module, the first end (pin 3 of T1) of the secondary coil of the
transformer (T1) is connected to the second power supply interface,
and the second end (pin 4 of T1) of the secondary coil of the
transformer (T1) is connected to the transmitting interface.
[0025] The output end of the switch module is grounded (GND), and
the control end of the switch module is connected to the master
control chip.
[0026] The master control chip is configured to transmit the
control signal to the control end of the switch module when the
data transmitting circuit transmits the data signal to the
transmitting interface.
[0027] The switch module is configured to switch on or off the
circuit path between the input end and the output end of the switch
module when receiving the control signal transmitted by the master
control chip.
[0028] According to the data transmitting circuit provided in this
embodiment, when the switch module switches off the circuit path
between the input end and the output end of the switch module, no
current flows through the primary coil of the transformer, and a
signal transmitted by the transmitting interface is a signal
corresponding to the first direct voltage. When the switch module
switches on the circuit path between the input end and the output
end of the switch module, a circuit path is formed between the
primary coil of the transformer and the ground end. Consequently, a
current is generated in the primary coil of the transformer, and
further a current is also generated in the secondary coil of the
transformer. At this time, the signal generated by the secondary
coil of the transformer will be coupled with the signal generated
by the second direct voltage to form a signal different from the
first direct voltage (a voltage value of the signal different from
the first direct voltage is non-zero). The master control chip
transmits the control signal according to the data to be
transmitted to control the switch module to switch on or off, and
then alternately transmits the signal corresponding to the first
direct voltage and the signal different from the first direct
voltage at the transmitting interface. In other words, when
transmitting data, the transmitting interface uses an alternating
current signal to send the data. For example, the transmitting
interface transmits data 1 with the signal corresponding to the
first direct voltage, and transmits data 0 with the signal
different from the first direct voltage; or transmits the data 0
with the signal corresponding to the first direct voltage, and
transmits the data 1 with the signal different from the first
direct voltage. The data transmitting circuit according to this
embodiment may ensure stability and quality of signal
transmission.
[0029] In this embodiment, since voltage values of the signal
corresponding to the first direct voltage and the signal different
from the first direct voltage alternately transmitted by the
transmitting interface are non-zero, that is, the voltage values of
the data signals transmitted by the transmitting interface are
non-zero. Compared with pulling a voltage value down to zero during
data signal transmission in the prior art, on the one hand,
continuous power supply to the data receiving apparatus may be
achieved with the data signal transmitted, and on the other hand,
the efficiency of data transmission may be improved, and the time
required for data transmission may be shortened.
[0030] In addition, when transmitting data using the data
transmitting circuit provided in this embodiment, the second power
supply interface, which may be a VCC, is connected to a pin to
realize data transmission, that is, the pin is connected to a power
supply line to realize data transmission, so that both the power
supply to the data transmitting apparatus and the data transmission
are realized on one line.
[0031] As an optional implementation of the embodiment, the signal
generated by the secondary coil of the transformer will be coupled
with the signal generated by the second direct voltage to form a
signal different from the first direct voltage, i.e., to form a
signal higher than the first direct voltage, or to form a signal
lower than the first direct voltage. The signal different from the
first direct voltage may be set according to different needs of an
application, and is not limited here.
[0032] As an optional implementation of the embodiment, the master
control chip transmits the control signal to the control end of the
switch module. For example, in a default state, the control end of
the switch module maintains a signal of either a high level or a
low level to keep the switch module in a switch-on state, and the
circuit path is switched off at this time. When the switch needs to
be switched off to connect the circuit path, the control signal
transmitted is another signal of the high level and low level. In
detail, switching off the switch with the high level or the low
level may be determined according to the type of components used
when the switch module is implemented, and there is no limitation
here.
[0033] As an optional implementation of the embodiment, the
foregoing data transmitting circuit may be applied to
medium-distance transmission. For example, an exemplary application
scenario where: an electronic device provided with a wireless card
reader and the data transmitting circuit reads card information at
a certain distance. Of course, the data transmitting circuit may
also be applied to short-distance transmission. For example, a
scene where the electronic device is provided with the data
transmitting circuit and a two-wire communication interface, and
two such electronic devices transmit data via the two-wire
communication interface. There are no restrictions here.
[0034] As an optional implementation of the embodiment, as shown in
FIG. 2, the first power supply interface configured to provide the
first direct voltage may be the first power supply interface
connected to a DC power supply VCC; and the second power supply
interface configured to provide the second direct voltage may be
the second power supply interface connected to a chip operating
voltage VDD.
[0035] As an optional implementation of the embodiment, the voltage
at the first power supply interface may be greater than the voltage
at the second power supply interface, and the transmitted signal
may be amplified, thereby realizing the transmission of signals at
medium and long distances. For example, the voltage at the first
power supply interface is 12 v, and the voltage at the second power
supply interface is 5 v. Of course, according to the needs of
practical applications, the voltage at the first power supply
interface may also be equal to or less than the voltage at the
second power supply interface.
[0036] As an optional implementation of the embodiment, another
schematic diagram of a data transmitting circuit shown in FIG. 3 or
FIG. 4 is provided. The data transmitting circuit shown in FIG. 3
corresponds to the data transmitting circuit shown in FIG. 1, and
the data transmitting circuit shown in FIG. 4 corresponds to the
data transmitting circuit shown in FIG. 2. The current limiting
module includes a first resistor R1 for current-limiting protection
when the circuit forms a path, thereby avoiding short circuit. When
the first resistor is implemented, the first resistor may include
one resistor or several parallel resistors or several series
resistors, which is not limited herein.
[0037] As an optional implementation of the embodiment, another
schematic diagram of a data transmitting circuit shown in FIG. 3 or
FIG. 4 is provided. The switch module includes a MOS transistor Q1
or a triode. For example, when the switch module uses an NMOS
transistor, a drain D of the NMOS transistor is used as the input
end of the switch module, a source S of the NMOS transistor is used
as the output end of the switch module, and a gate G of the NMOS
transistor is used as the control end of the switch module. For
another example, when the switch module uses a PMOS transistor, a
source S of the PMOS transistor is used as the input end of the
switch module, a drain D of the PMOS transistor is used as the
output end of the switch module, and a gate G of the PMOS
transistor is used as the control end of the switch module. For
another example, the switch module may also use a triode and other
components that may implement the switch-on or -off function, which
is not limited here.
[0038] As an optional implementation of the embodiment, a glitch
filtering module, such as a diode, is provided between the first
end and the second end of the primary coil of the transformer, and
is configured to filter glitch signals generated in the circuit. Of
course, when current signals are stable in the circuit, the glitch
filtering module may not be provided.
[0039] As an optional implementation of the embodiment, a filtering
module is provided between the first end and the second end of the
secondary coil of the transformer, for example, three components
including an inductor, a resistor and a diode are connected, or the
inductor, the resistor and the diode are connected in parallel, to
filter glitch signals generated in the circuit. Of course, when
current signals are stable in the circuit, the glitch filtering
module may not be provided.
[0040] An embodiment further provides a data receiving circuit, as
shown in FIG. 5, including: a receiving interface, a first voltage
dividing module, a voltage reduction module, a second voltage
dividing module, a second capacitor C2, a filtering module, a
comparator A1, and a master control chip.
[0041] A first end of the first voltage dividing module and a first
end of the second capacitor C2 are connected to the receiving
interface.
[0042] A second end of the first voltage dividing module and a
second end of the second capacitor C2 are connected to a first
common connection end, the first common connection end is connected
to an input end of the filtering module, an output end of the
filtering module is connected to a negative input end of the
comparator A1, and a ground end of the filtering module is grounded
(GND).
[0043] The first common connection end is connected to an input end
of the voltage reduction module.
[0044] An output end of the voltage reduction module is connected
to a second common connection end, and the second common connection
end is connected to a positive input end of the comparator A1.
[0045] The second common connection end is connected to a first end
of the second voltage dividing module.
[0046] A second end of the second voltage dividing module is
grounded (GND).
[0047] The comparator A1 is configured to compare a voltage of the
positive input end with a voltage of the negative input end when
the data receiving circuit receives a data signal through the
receiving interface, and to output a comparison result signal to
the master control chip through an output end of the comparator
A1.
[0048] The master control chip is connected to the output end of
the comparator A1, and configured to receive the comparison result
signal output from the output end of the comparator A1.
[0049] According to the data receiving circuit provided in the
embodiment, when the signal received by the receiving interface is
an alternating current signal, the signal received by the positive
input end of the comparator is also an alternating current signal.
As the negative input end of the comparator is provided with the
filtering module, the alternating current signal will be filtered
to obtain a direct current signal, so the negative input end of the
comparator will receive the direct current signal. When the voltage
of the alternating current signal received by the positive input of
the comparator is greater than the voltage of the direct current
signal received by the negative input of the comparator, the
comparison result signal output by the comparator is high level.
When the voltage of the alternating current signal received by the
positive input of the comparator is less than the voltage of the
direct current signal received by the negative input of the
comparator, the comparison result signal output by the comparator
is low level, thereby realizing the reception of the data signal.
The new-type data receiving circuit according to the embodiment may
ensure stability and quality of signal reception.
[0050] As an optional implementation of the embodiment, as shown in
FIG. 6, the first voltage dividing module includes a second
resistor R2, the voltage reduction module includes a diode Q2, and
the second voltage dividing module includes a third resistor R3.
For the data receiving circuit provided in the embodiment, when a
signal is received by the receiving interface, the voltage of the
received signal may be reduced to a voltage range supported by the
comparator through the first voltage dividing module, the voltage
reduction module, and the second voltage dividing module, thereby
ensuring that the comparator may perform a normal comparison to
output the comparison result signal.
[0051] As an optional implementation of the embodiment, as shown in
FIG. 6, the filtering module includes: a fourth resistor R4 and a
third capacitor C3. A first end of the fourth resistor R4 is
connected to the input end of the filtering module, and a second
end of the fourth resistor R4 is connected to the output end of the
filtering module; and a first end of the third capacitor C3 is
connected to the output end of the filtering module, and a second
end of the third capacitor C3 is connected to the ground end of the
filtering module. In the embodiment, the filtering module may
rectify and filter the alternating current signal to obtain a
relatively smooth direct current signal.
[0052] As an optional implementation of the embodiment, as shown in
FIG. 6, the positive input end and the output end of the comparator
A1 are further connected with an anti-shaking module. The
anti-shaking module includes a resistor R6 configured to prevent a
circuit from shaking. Of course, under the premise of stable
circuit, it is unnecessary to set the anti-shaking module.
[0053] An embodiment further provides a data transmitting
apparatus, including the data transmitting circuit shown in FIG. 1
or FIG. 2. The data sending apparatus may be an information reading
device, such as a card reader, or an electronic device (such as a
personal computer (PC) or a mobile phone) that needs to read
information from an electronic signature tool.
[0054] An embodiment further provides a data receiving apparatus,
including the data receiving circuit shown in FIG. 5 or 6. The data
receiving apparatus may be an electronic device carrying
information, such as a smart card, an electronic signature tool,
and the like.
[0055] An embodiment further provides a data transferring
apparatus, including the data transmitting circuit shown in FIG. 1
or FIG. 2 and the data receiving circuit shown in FIG. 5 or 6. The
data transferring apparatus may be, for example, a card reader and
a smart card that cooperate with each other, a host computer (such
as a PC, a mobile phone, and the like) and an electronic signature
tool.
[0056] As an optional implementation of the embodiment, the
transmitting interface and the receiving interface are located in
one interface. For example, the data transferring apparatus
supports the two-wire communication interface. One pin in the
two-wire communication interface may be used as a transmitting
interface or a receiving interface, and the other pin of the
two-wire communication interface is grounded, so that data may be
transmitted and received on the same communication interface.
[0057] At the same time, in the data transferring apparatus
according to the embodiment, a pin for implementing data
transmission and reception is connected to the second power supply
interface, and the second power supply interface may be the VCC,
that is, the pin for implementing the data transmission and
reception is connected to the power supply line, so that both power
supply and data transmission and reception are realized on one
line.
[0058] Of course, the transmitting interface may be separated from
the receiving interface, and specific arrangements may be made
according to application requirements.
[0059] Reference throughout this specification to "an embodiment",
"some embodiments", "an example", "a specific example" or "some
examples" means that a particular feature, structure, material, or
characteristic described in connection with the embodiment or
example is included in at least one embodiment or example of the
present disclosure. The appearances of the above phrases in various
places throughout this specification are not necessarily referring
to the same embodiment or example of the present disclosure.
Furthermore, the particular features, structures, materials, or
characteristics may be combined in any suitable manner in one or
more embodiments or examples.
[0060] Although embodiments of present disclosure have been shown
and described above, it should be understood that above embodiments
are just explanatory, and cannot be construed to limit the present
disclosure. For those skilled in the art, changes, alternatives,
and modifications can be made to the embodiments without departing
from spirit, principles and scope of the present disclosure. The
scope of the present disclosure is defined by the attached claims
and their equivalents.
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