Wireless charging receiving circuit, terminal device and wireless charging system

Abstract

A wireless charging receiving circuit, a terminal device and a wireless charging system are used to prevent the output voltage of the wireless charging receiving circuit from shaking when ASK modulation is performed. The wireless charging receiving circuit comprises a rectifier bridge, a resonance circuit, a first capacitor (C3), a first switch (Q5) and a first synchronous circuit (1221). The resonance circuit is electrically connected between the first AC input end (AC1) and the second AC input end (AC2) of the rectifier bridge. The first switch (Q5) and the first capacitor (C3) are connected in series between the first AC input end (AC1) and the ground (GND). The first synchronous circuit (1221) comprises a first input end (ASK1), a second input end (IN1) and a first output end (OUT1). The first input end (ASK1) is used to input an amplitude shift keying (ASK) modulation signal (ASK_MOD). The second input end (IN1) is electrically connected to the first AC input end (AC1). The first output end (OUT1) is electrically connected to the control end of the first switch (Q5). The first synchronous circuit (1221) is used to output the ASK modulation signal through the first output end (OUT1) when the voltage at the second input end (IN1) changes from a positive voltage to a negative voltage, so that the first switch (Q5) is turned on.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wireless charging, in particular to a wireless charging receiving circuit, a terminal device and a wireless charging system. BACKGROUND

[0002] In the existing wireless charging communication system based on Qi protocol, a wireless charging transmitting circuit and a wireless charging receiving circuit are included. The wireless charging transmitting circuit performs frequency shift keying (FSK) modulation and amplitude shift keying (ASK) demodulation, and the wireless charging receiving circuit performs ASK modulation and FSK demodulation. When the wireless charging receiving circuit performs ASK modulation, a switch is controlled by a modulation signal to short the coupling capacitor to the ground, so as to achieve the modulation purpose.

[0003] With the increasing transmission power of wireless charging, the output voltage of the wireless charging receiving circuit is also increasing. When ASK modulation is performed, if the ASK modulation signal directly connects the coupling capacitor to the ground, since the output voltage is high at this time, it will be a large transient response for the coupling capacitor, which may cause the output voltage to oscillate, thereby causing the ASK demodulation of the wireless charging transmitting circuit to fail. SUMMARY

[0004] Embodiments of the present application provide a wireless charging receiving circuit, a terminal device and a wireless charging system, which are used to prevent the output voltage from oscillating when the wireless charging receiving circuit performs ASK modulation.

[0005] To achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a wireless charging receiving circuit is provided, comprising: a rectifier bridge, a resonance circuit, a first capacitor, a first switch and a first synchronous circuit; the resonance circuit is electrically connected between the first alternating current input end and the second alternating current input end of the rectifier bridge, and the first switch and the first capacitor are connected in series between the first alternating current input end and the ground; the first synchronous circuit comprises a first input end, a second input end and a first output end, the first input end is used to input an amplitude shift keying (ASK) modulation signal, the second input end is electrically connected to the first alternating current input end, and the first output end is electrically connected to the control end of the first switch; the first synchronous circuit is used to output the ASK modulation signal through the first output end when the voltage at the second input end changes from a positive voltage to a negative voltage (i.e. at the zero crossing moment), so that the first switch is turned on, at this time, the voltage drop of the first capacitor is very small near the zero crossing point, and the transient response generated is very small.

[0007] The wireless charging receiving circuit provided by the embodiments of the present application can output an ASK modulated signal through the first output end of the first synchronous circuit when the voltage at the first AC input end changes from a positive voltage to a negative voltage, so as to turn on the first switch. At this time, the voltage at the first AC input end has a very small drop near the zero-crossing point, and the transient response generated on the first capacitor is very small, thereby preventing the output voltage from oscillating when the wireless charging receiving circuit is performing ASK modulation. In essence, the first synchronous circuit is used to synchronize the ASK modulated signal with the zero-crossing time of the first AC input end.

[0008] In a possible implementation, the wireless charging receiving circuit further comprises a second capacitor, a second switch and a second synchronous circuit; the second switch and the second capacitor are connected in series between the second AC input end and the ground; the second synchronous circuit comprises a third input end, a fourth input end and a second output end, the third input end is configured to input the ASK modulated signal, the fourth input end is electrically connected to the second AC input end, and the second output end is electrically connected to the control end of the second switch; the second synchronous circuit is configured to output the ASK modulated signal through the second output end when the voltage at the fourth input end changes from a positive voltage to a negative voltage (i.e., the zero-crossing time), so as to turn on the second switch, at this time, the voltage at the second capacitor has a very small drop near the zero-crossing point, and the transient response generated is very small. Similarly to the working principle of the first synchronous circuit, the second synchronous circuit outputs the ASK modulated signal through the second output end when the voltage at the second AC input end changes from a positive voltage to a negative voltage, so as to turn on the second switch. At this time, the voltage at the second AC input end has a very small drop near the zero-crossing point, and the transient response generated on the second capacitor is very small, thereby preventing the output voltage from oscillating when the wireless charging receiving circuit is performing ASK modulation. In essence, the second synchronous circuit is used to synchronize the ASK modulated signal with the zero-crossing time of the second AC input end.

[0009] In a possible implementation, the second synchronous circuit further comprises a second comparator and a second flip-flop, the non-inverting input end of the second comparator is electrically connected to the ground, the inverting input end of the second comparator is electrically connected to the second AC input end, the output end of the second comparator is electrically connected to the clock signal end of the second flip-flop, the data input end of the second flip-flop is configured to input the ASK modulated signal, and the data output end of the second flip-flop is electrically connected to the control end of the second switch. This implementation provides a possible structure of the second synchronous circuit.

[0010] The working principle of the second synchronization circuit is as follows: when the voltage of the second AC input end of the rectifier bridge circuit is a positive voltage, which is higher than the (zero) voltage of the ground, the second comparator outputs a low level, and the second flip-flop does not output a signal. When the voltage of the second AC input end of the rectifier bridge circuit changes from a positive voltage to a negative voltage (i.e., zero crossing), the voltage of the second AC input end is lower than the (zero) voltage of the ground, at this time, the output of the second comparator changes from a low level to a high level (i.e., rising edge), in other words, at the moment when the voltage of the second AC input end of the rectifier bridge circuit changes from a positive voltage to a negative voltage (i.e., zero crossing), the second synchronization circuit outputs a rising edge, triggers the second flip-flop to work, and outputs the modulated signal input from the data input end through the data output end to obtain a second signal, which is output to the control end of the second switch to control the second switch to be turned on.

[0011] In a possible implementation, the first synchronization circuit comprises a first comparator and a first flip-flop, the non-inverting input end of the first comparator is electrically connected to the ground, the inverting input end of the first comparator is electrically connected to the first AC input end, the output end of the first comparator is electrically connected to the clock signal end of the first flip-flop, the data input end of the first flip-flop is used to input the ASK modulated signal, and the data output end of the first flip-flop is electrically connected to the control end of the first switch. This implementation provides a possible structure of the first synchronization circuit.

[0012] The working principle of the first synchronization circuit is as follows: when the voltage of the first AC input end of the rectifier bridge circuit is a positive voltage, which is higher than the (zero) voltage of the ground, the first comparator outputs a low level, and the first flip-flop does not output a signal. When the voltage of the first AC input end of the rectifier bridge circuit changes from a positive voltage to a negative voltage (i.e., zero crossing), the voltage of the first AC input end is lower than the (zero) voltage of the ground, at this time, the output of the first comparator changes from a low level to a high level (i.e., rising edge), in other words, at the moment when the voltage of the first AC input end of the rectifier bridge circuit changes from a positive voltage to a negative voltage (i.e., zero crossing), the first synchronization circuit outputs a rising edge, triggers the first flip-flop to work, and outputs the modulated signal input from the data input end through the data output end to obtain a first signal, which is output to the control end of the first switch Q5 to control the first switch to be turned on.

[0013] In a possible implementation, the rectifier bridge is a full-bridge rectifier bridge. This implementation provides a possible structure of the rectifier bridge.

[0014] In a possible implementation, the resonant circuit is an LC resonant circuit. This implementation provides a possible structure of the resonant circuit.

[0015] In a possible implementation, the second switch is a metal oxide semiconductor (MOS) tube, and the control end of the second switch is the gate of the MOS tube. This implementation provides a possible structure of the second switch.

[0016] In a possible implementation, the first switch is a MOS tube, and the control end of the first switch is the gate of the MOS tube. This implementation provides a possible structure of the first switch.

[0017] In a possible implementation, the flip-flop involved in the embodiments of the present application is a flip-flop triggered by a rising edge (i.e., the moment of changing from low level to high level, or the moment of changing from "0" to "1"), such as a D flip-flop.

[0018] In a second aspect, a terminal device is provided, which includes the wireless charging receiving circuit and the working circuit of the first aspect and any implementation thereof, and the wireless charging receiving circuit is configured to supply power to the working circuit.

[0019] In a third aspect, a wireless charging system is provided, which includes the wireless charger and the terminal device of the second aspect, and the wireless charger includes a wireless charging transmitting circuit configured to transmit power to the wireless charging receiving circuit of the terminal device through an electromagnetic field.

[0020] The technical effects of the second aspect or the third aspect are referred to the first aspect and any implementation thereof, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A schematic diagram of an architecture of a wireless charging system provided by the embodiments of the present application is shown;

[0022] Figure 2 A timing diagram of an ASK modulated signal provided by the embodiments of the present application is shown;

[0023] Figure 3 A schematic diagram of an architecture of another wireless charging system provided by the embodiments of the present application is shown;

[0024] Figure 4 A schematic diagram of a voltage Vrect without obvious oscillation using the scheme of the present application is shown;

[0025] Figure 5 A schematic diagram of a structure of a first synchronization circuit provided by the embodiments of the present application is shown;

[0026] Figure 6 A schematic diagram of a structure of a second synchronization circuit provided by the embodiments of the present application is shown. DETAILED DESCRIPTION

[0027] The embodiments of the present application provide a wireless charging system, which can comply with the Qi wireless charging protocol. As shown in the figure, the wireless charging system includes a wireless charger (i.e., a transmitting end) 11 and a terminal device (i.e., a receiving end) 12. Figure 1 The wireless charging system includes a wireless charger (i.e., a transmitting end) 11 and a terminal device (i.e., a receiving end) 12.

[0028] The terminal device involved in the embodiments of the present application can be a device containing wireless transceiving function. Specifically, the terminal device can refer to a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. For example, the terminal device can be a mobile phone, a smart speaker, a smart watch, a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a robot, a drone, a smart driving vehicle, a smart home, a vehicle-mounted device, a medical device, a smart logistics device, a wearable device, a terminal device in a future 5th generation (5G) mobile communication technology network or a network after 5G, etc., and the embodiments of the present application do not limit this.

[0029] The wireless charger 11 includes a first micro-controller unit (MCU) 111 and a wireless charging transmitting circuit 112. The wireless charging transmitting circuit 112 includes a power circuit and a first resonant circuit, wherein the power circuit includes metal oxide semiconductor (MOS) tubes q1-q4, and the first resonant circuit includes an inductor L1 and a capacitor C1, and the inductor L1 is a transmitting coil.

[0030] The terminal device 12 includes a second MCU 121, a wireless charging receiving circuit 122 and a working circuit, and an output end of the wireless charging receiving circuit 122 is connected to the working circuit to supply power to the working circuit. For example, the working circuit includes a low dropout regulator (LDO) 123, a charging chip 124 and a battery 125, and the wireless charging receiving circuit 122 supplies power to the battery 125 through the LDO 123 and the charging chip 124 in sequence.

[0031] The wireless charging receiving circuit 122 includes a rectifier bridge circuit, a second resonant circuit, and further includes a first switch Q5, a second switch Q6, a first capacitor C3 and a second capacitor C4. For example, the first switch Q5 and the second switch Q6 are MOS tubes.

[0032] In a possible implementation, the rectifier bridge circuit can be a full-bridge rectifier. For example, the rectifier bridge circuit includes MOS tubes Q1-Q4.

[0033] The second resonance circuit includes an inductor L2 and a capacitor C2 in series, and the inductor L2 is a receiving coil. The second resonance circuit is electrically connected between the first AC input end AC1 and the second AC input end AC2 of the rectifier bridge circuit. The first switch Q5 and the first capacitor C3 are connected in series between the first AC input end AC1 and the ground GND. The second switch Q6 and the second capacitor C4 are connected in series between the second AC input end AC2 and the ground GND.

[0034] The working principle of the wireless charging system is as follows:

[0035] The wireless charging transmitting circuit 112 inputs a direct current voltage Vin, and the first MCU 111 generates a pulse width modulation (PWM) control signal to control the MOS tubes q1 / q3 and q2 / q4 to alternately conduct, so that the direct current voltage Vin generates an alternating current voltage (square wave) through the power circuit, and the alternating current voltage is loaded on both ends of the first resonance circuit to generate an alternating current. The alternating current passes through the inductor L1 (i.e., the transmitting coil) to generate an electromagnetic field, and the electromagnetic field transmits power to the wireless charging receiving circuit 122 of the terminal device.

[0036] The inductor L2 (i.e., the receiving coil) of the wireless charging receiving circuit 122 induces the electromagnetic field, thereby generating an alternating current in the second resonance circuit. The second MCU 121 generates a PWM control signal to control the MOS tubes Q1 / Q3 and Q2 / Q4 to alternately conduct, so that the alternating current is converted into a direct current voltage through the rectifier bridge circuit, and the direct current voltage is charged to the battery 125 through the LDO 123 and the charging chip 124.

[0037] In order to ensure the stable operation of the entire wireless charging system, a target voltage is set for the voltage Vrect output by the rectifier bridge circuit, and the feedback loop is fed back to the wireless charging transmitting circuit 112. In order to improve the charging efficiency, the target voltage is usually set to be slightly higher than the input voltage of the LDO 123.

[0038] The second MCU 121 collects the Vrect voltage and subtracts the target voltage to generate an error signal. The error signal is transmitted to the first MCU 11 through the communication mode specified by the Qi protocol, and the first MCU 11 determines whether to increase or decrease the transmission energy according to the error signal. Specifically, the first MCU 11 controls the transmission energy by controlling the input direct current voltage Vin, the switching frequency and the duty cycle of the PWM control signal.

[0039] For example, when the second MCU 121 transmits the error signal to the wireless charging transmitting circuit 112 by ASK modulation, the first switch Q5 (the second switch Q6) is controlled to be turned on and turned off by outputting the ASK modulation signal ASK_MOD (a square wave) to the first switch Q5 (the second switch Q6), so as to control the first capacitor C3 (the second capacitor C4) to be grounded, and further change the equivalent impedance of the second resonant circuit. The change of the equivalent impedance of the second resonant circuit causes the change of the alternating current in the first resonant circuit and the change of the input voltage of the first resonant circuit. The first MCU 111 can obtain the error signal by collecting and ASK demodulating the changes of the current or voltage.

[0040] When the voltage Vrect output by the rectifier bridge circuit is relatively high, if the first capacitor C3 (the second capacitor C4) is directly grounded, a large transient response is generated, so that the equivalent impedance of the second resonant circuit and the voltage Vrect are oscillated, thereby causing the ASK demodulation of the first MCU 111 to fail. For example, as shown in FIG. 6, when the voltage of the first alternating current input end AC1 is about 7V, the ASK modulation signal ASK_MOD controls the first switch Q5 to be turned on, so that the first capacitor C3 is grounded. Figure 2

[0041] The embodiment of the present application provides a wireless charging receiving circuit. When the first alternating current input end AC1 of the rectifier bridge circuit changes from a positive voltage to a negative voltage (i.e., zero crossing), the first switch Q5 is controlled to be turned on, and the first capacitor C3 is grounded. At this time, the voltage drop of the first capacitor C3 near the zero crossing point is small, and the generated transient response is small. Alternatively, when the second alternating current input end AC2 of the rectifier bridge circuit changes from a positive voltage to a negative voltage (i.e., zero crossing), the second switch Q6 is controlled to be turned on, and the second capacitor C4 is grounded. At this time, the voltage drop of the second capacitor C4 near the zero crossing point is small, and the generated transient response is small. Through the above method, the equivalent impedance of the second resonant circuit and the voltage Vrect can be prevented from being affected, and the ASK demodulation of the first MCU 111 can be prevented from failing.

[0042] Specifically, as shown in FIG. 7, the embodiment of the present application provides another wireless charging receiving circuit. Compared with the wireless charging receiving circuit shown in FIG. 5, the wireless charging receiving circuit further includes a first synchronization circuit 1221 and a second synchronization circuit 1222. Figure 3 Figure 1 The first synchronization circuit 1221 is configured to synchronize the ASK modulation signal with the zero crossing moment of the first alternating current input end AC1, and the second synchronization circuit 1222 is configured to synchronize the ASK modulation signal with the zero crossing moment of the second alternating current input end AC2.

[0043] ​​The first synchronization circuit 1221 includes a first input terminal ASK1, a second input terminal IN1, and a first output terminal OUT1. The first input terminal ASK1 is used to input the ASK modulation signal ASK_MOD, the second input terminal IN1 is electrically connected to the first AC input terminal AC1, and the first output terminal OUT1 is electrically connected to the control terminal (e.g., the gate of a MOSFET) of the first switch Q5.

[0044] The first synchronization circuit 1221 is used to output an ASK modulation signal ASK_MOD through the first output terminal OUT1 when the voltage at the second input terminal IN1 (i.e., the first AC input terminal AC1) changes from a positive voltage to a negative voltage, so as to turn on the first switch Q5 and electrically connect the first capacitor C3 to ground GND. At this time, the voltage drop of the first capacitor C3 near the zero crossing point is very small, resulting in a small transient response. It should be noted that, in order to distinguish it from the original ASK modulation signal ASK_MOD, the signal output by the first output terminal OUT1 is represented as the first signal ASK_MOD_SYN1.

[0045] The second synchronization circuit 1222 includes a third input terminal ASK2, a fourth input terminal IN2, and a second output terminal OUT2. The third input terminal ASK2 is used to input the ASK modulation signal ASK_MOD, the fourth input terminal IN2 is electrically connected to the second AC input terminal AC2, and the second output terminal OUT2 is electrically connected to the control terminal (e.g., the gate of a MOSFET) of the second switch Q6.

[0046] The second synchronization circuit 1222 is used to output an ASK modulation signal ASK_MOD through the second output terminal OUT2 when the voltage at the fourth input terminal IN2 (i.e., the second AC input terminal AC2) changes from positive to negative, thereby turning on the second switch Q6 and electrically connecting the second capacitor C4 to ground GND. At this time, the voltage drop of the second capacitor C4 near the zero crossing point is very small, resulting in a very small transient response. It should be noted that, in order to distinguish it from the original ASK modulation signal ASK_MOD, the signal output by the second output terminal OUT2 is represented as the second signal ASK_MOD_SYN2.

[0047] For example, such as Figure 2 As shown, the first signal ASK_MOD_SYN1 corresponding to the ASK modulation signal ASK_MOD controls the first switch Q5 to conduct when the voltage at the first AC input terminal AC1 is approximately -300mV, thus grounding the first capacitor C3. Compared to the ASK modulation signal ASK_MOD controlling the first switch Q5 to conduct when the voltage at the first AC input terminal AC1 is approximately 7V, thus grounding the first capacitor C3, the voltage drop across the first capacitor C3 decreases significantly, resulting in a much smaller transient response. Furthermore, as... Figure 4As shown, the rising and falling of the voltage Vrect are relatively stable without oscillation phenomenon due to no large transient response.

[0048] The wireless charging receiving circuit, the terminal device and the wireless charging system provided by the embodiments of the present application, wherein the wireless charging receiving circuit comprises a rectifier bridge, a resonance circuit, a first capacitor, a first switch and a first synchronization circuit; the resonance circuit is electrically connected between the first AC input end and the second AC input end of the rectifier bridge, and the first switch and the first capacitor are connected in series between the first AC input end and the ground; the first synchronization circuit comprises a first input end, a second input end and a first output end, the first input end is used for inputting an ASK modulation signal, the second input end is electrically connected to the first AC input end, and the first output end is electrically connected to the control end of the first switch; the first synchronization circuit is used for outputting the ASK modulation signal through the first output end when the voltage at the second input end changes from a positive voltage to a negative voltage, so as to make the first switch conductive. At this time, the voltage at the first AC input end has a very small drop near the zero-crossing point, and the transient response generated on the first capacitor is very small, thereby preventing the output voltage from oscillating when the wireless charging receiving circuit is performing ASK modulation.

[0049] The present application does not limit the structure of the first synchronization circuit 1221 and the second synchronization circuit 1222, and a possible structure of the first synchronization circuit 1221 and the second synchronization circuit 1222 is described below:

[0050] In a possible implementation manner, as shown in the figure, Figure 5 The first synchronization circuit 1221 comprises a first comparator CMP1 and a first flip-flop TR1. The non-inverting input end + of the first comparator CMP1 is electrically connected to the ground GND; the inverting input end - of the first comparator CMP1 is electrically connected to the first AC input end AC1, which is used for inputting the voltage of the first AC input end AC1 of the rectifier bridge circuit. The output end of the first comparator CMP1 is electrically connected to the clock signal end CLK of the first flip-flop TR1. The data input end D of the first flip-flop TR1 is used for inputting the ASK modulation signal ASK_MOD. The data output end Q of the first flip-flop TR1 is electrically connected to the control end of the first switch Q5, which is used for outputting the first signal ASK_MOD_SYN1 corresponding to the ASK modulation signal ASK_MOD, and controlling the first switch Q5 to conduct and turn off.

[0051] The flip-flop involved in the embodiments of the present application is a flip-flop triggered by a rising edge (i.e. the moment of changing from low level to high level, or the moment of changing from "0" to "1"), such as a D flip-flop.

[0052] The working principle of the first synchronization circuit 1221 is as follows: When the voltage of the first AC input terminal AC1 of the rectifier bridge circuit is positive, it is higher than the (zero) voltage of ground GND. The first comparator CMP1 outputs a low level, and the first flip-flop TR1 does not output a signal. When the voltage of the first AC input terminal AC1 of the rectifier bridge circuit changes from positive to negative (i.e., zero crossing), the voltage of the first AC input terminal AC1 is lower than the (zero) voltage of ground GND. At this time, the output of the first comparator CMP1 changes from low to high (i.e., rising edge). In other words, at the moment when the voltage of the first AC input terminal AC1 of the rectifier bridge circuit changes from positive to negative (i.e., zero crossing), the first synchronization circuit 1221 outputs a rising edge, triggering the first flip-flop TR1 to work, and outputting the ASK modulation signal ASK_MOD input from the data input terminal D through the data output terminal Q to obtain the first signal ASK_MOD_SYN1, which is output to the control terminal of the first switch Q5 to control the first switch Q5 to turn on.

[0053] In one possible implementation, such as Figure 6 As shown, the second synchronization circuit 1222 includes a second comparator CMP2 and a second flip-flop TR2. The non-inverting input terminal + of the second comparator CMP2 is electrically connected to ground GND, and the inverting input terminal - of the second comparator CMP2 is electrically connected to the second AC input terminal AC2, used to input the voltage of the second AC input terminal AC2 of the rectifier bridge circuit. The output terminal of the second comparator CMP2 is electrically connected to the clock signal terminal CLK of the second flip-flop TR2. The data input terminal D of the second flip-flop TR2 is used to input the ASK modulation signal ASK_MOD. The data output terminal Q of the second flip-flop TR2 is electrically connected to the control terminal of the first switch Q5, used to output the second signal ASK_MOD_SYN2 corresponding to the ASK modulation signal ASK_MOD, controlling the second switch Q6 to turn on and off.

[0054] The working principle of the second synchronization circuit 1222 is as follows: when the voltage of the second AC input end AC2 of the rectifier bridge circuit is a positive voltage higher than the (zero) voltage of the ground GND, the second comparator CMP2 outputs a low level, and the second flip-flop TR2 does not output a signal. When the voltage of the second AC input end AC2 of the rectifier bridge circuit changes from a positive voltage to a negative voltage (i.e., zero crossing), the voltage of the second AC input end AC2 is lower than the (zero) voltage of the ground GND, at this time, the output of the second comparator CMP2 changes from a low level to a high level (i.e., rising edge), in other words, at the moment when the voltage of the second AC input end AC2 of the rectifier bridge circuit changes from a positive voltage to a negative voltage (i.e., zero crossing), the second synchronization circuit 1222 outputs a rising edge, triggers the second flip-flop TR2 to work, and outputs the ASK modulation signal ASK_MOD input from the data input end D through the data output end Q, to obtain the second signal ASK_MOD_SYN2, which is output to the control end of the second switch Q6 to control the second switch Q6 to be turned on.

[0055] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0056] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the present embodiment.

[0057] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A wireless charging receive circuit, comprising: The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit.

2. The wireless charging receive circuit of claim 1, wherein, The application relates to a wireless charging receiving circuit and a working circuit.

3. The wireless charging receive circuit of claim 1, wherein, The application relates to a wireless charging receiving circuit and a working circuit.

4. The wireless charging receive circuit of claim 1, wherein, The application relates to a wireless charging receiving circuit and a working circuit.

5. The wireless charging receive circuit of claim 1, wherein, The application relates to a wireless charging receiving circuit and a working circuit.

6. The wireless charging receive circuit of claim 1, wherein, The application relates to a wireless charging receiving circuit and a working circuit.

7. The wireless charging receive circuit of claim 1, wherein, The application relates to a wireless charging receiving circuit and a working circuit.

8. A terminal device, comprising: The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. 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The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to a wireless charging receiving circuit and a working circuit. The application relates to 9. A wireless charging system, comprising: The terminal device as claimed in claim 8, wherein the wireless charger comprises a wireless charging transmission circuit for transmitting electric power to a wireless charging reception circuit of the terminal device through an electromagnetic field.

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