Wireless charging circuit and mobile wireless charging device

Abstract

This utility model discloses a wireless charging circuit and a mobile wireless charging device, including a power management circuit for managing the charging and discharging of a secondary battery; a first switching circuit for turning the power management circuit and the wireless charging chip on or off; a standby power supply circuit for outputting a first power supply signal to the wireless charging chip in standby mode; when the wireless charging chip detects a coil induction signal in the coil in standby mode, it transmits a wireless charging signal through the coil; a wake-up circuit for outputting a wake-up signal; a main control chip for controlling the standby power supply circuit to stop working in low-power mode and controlling the first switching circuit to disconnect through the power management circuit; and controlling the standby power supply circuit to work normally according to the wake-up signal and controlling the first switching circuit to turn on through the power management circuit. By reducing the energy loss of the power management circuit and the wireless charging chip in low-power mode, the standby power consumption of the wireless charging circuit is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology, and in particular to a wireless charging circuit and a mobile wireless charging device. Background Technology

[0002] Existing mobile wireless charging devices detect the wireless charging load by sampling the Q value of the coil. When the wireless charging load is placed on the mobile wireless charging device for charging, the coil's Q value changes, and the mobile wireless charging device activates the coil's power transmission to initiate wireless charging. However, when no mobile wireless load is detected, the mobile wireless charging device typically performs Q value detection intermittently. This results in significant energy loss, causing the stored energy in the mobile wireless charging device to be lost during storage or transportation, thus affecting product performance. Utility Model Content

[0003] This utility model provides a wireless charging circuit and a mobile wireless charging device to solve the problem of high standby power consumption in existing mobile wireless charging devices.

[0004] A wireless charging circuit includes a power management circuit, a first switching circuit, a standby power supply circuit, a wireless charging chip, a wake-up circuit, and a main control chip. The power management circuit is used to connect to the secondary battery and manage the charging and discharging of the secondary battery; The first switching circuit is connected to the power management circuit and the wireless charging chip, and is used to turn the power management circuit and the wireless charging chip on or off; The standby power supply circuit is connected to the secondary battery and the wireless charging chip, and is used to output a first power supply signal to the wireless charging chip in standby mode; The wireless charging chip is used to connect to the coil and to transmit a wireless charging signal through the coil when the coil induction signal of the coil is detected in the standby mode. The wake-up circuit is used to output a wake-up signal; The main control chip is connected to the power management circuit, the standby power supply circuit, the wireless charging chip, and the wake-up circuit. In low-power mode, it controls the standby power supply circuit to stop working and controls the first switching circuit to disconnect through the power management circuit; or, according to the wake-up signal, it controls the standby power supply circuit to work normally and controls the first switching circuit to turn on through the power management circuit.

[0005] Furthermore, the first switching circuit includes a first switching transistor and a second switching transistor; The first terminal of the first switching transistor is connected to the voltage output terminal of the power management circuit, the first terminal of the second switching transistor is connected to the wireless charging chip, and the second terminals of the first and second switching transistors are connected together to the voltage detection terminal of the power management circuit. The first control terminal of the power management circuit is connected to the third terminal of the first switching transistor and the third terminal of the second switching transistor, respectively.

[0006] Furthermore, both the first and second switching transistors are MOSFETs; the channel type of the first switching transistor is the same as that of the second switching transistor. The first terminal of the first switch is the drain, the second terminal of the first switch is the source, and the third terminal of the first switch is the gate; the first terminal of the second switch is the drain, the second terminal of the second switch is the source, and the third terminal of the second switch is the gate.

[0007] Furthermore, the standby power supply circuit includes a third switching transistor and a voltage conversion circuit; The first terminal of the third switch is connected to the secondary battery, the second terminal of the third switch is connected to the voltage conversion circuit, and the third terminal of the third switch is connected to the main control chip. The third switch is turned on in the standby mode and turned off in the low power mode. The voltage conversion circuit is connected to the wireless charging chip and is used to convert the output voltage of the secondary battery and output the first power supply signal when the third switch is turned on.

[0008] Furthermore, the voltage conversion circuit includes a low-dropout linear regulator.

[0009] Furthermore, the wireless charging circuit includes a charging interface; the charging interface is connected to the power management circuit and is used to connect a power adapter and output a charging signal to the power management circuit.

[0010] Furthermore, the wake-up circuit includes a push-button switch; the first end of the push-button switch is connected to the main control chip, and the second end of the push-button switch is grounded.

[0011] Furthermore, the wireless charging circuit also includes a charging control circuit; the charging control circuit is connected to the charging interface, the main control chip and the wireless charging chip, and is used to turn on the charging interface and the wireless charging chip in charging mode.

[0012] Furthermore, the charging control circuit includes a fourth switch, a fifth switch, a sixth switch, a first resistor, and a second resistor; The first end of the fourth switch is connected to the charging interface, the second end of the fourth switch is connected to the first end of the fifth switch, and the second end of the fifth switch is connected to the wireless charging chip. The first end of the first resistor is connected to the second end of the fourth switch and the first end of the fifth switch, and the second end of the first resistor is connected to the third end of the fourth switch, the third end of the fifth switch, and the first end of the second resistor. The first terminal of the sixth switch is connected to the second terminal of the second resistor, the second terminal of the sixth switch is grounded, and the third terminal of the sixth switch is connected to the main control chip.

[0013] A mobile wireless charging device includes a secondary battery, a coil, and the aforementioned wireless charging circuit; the secondary battery is connected to the power management circuit and the standby power supply circuit; the coil is connected to the wireless charging chip.

[0014] This utility model provides a wireless charging circuit and a mobile wireless charging device. The wireless charging circuit includes a power management circuit, a first switching circuit, a standby power supply circuit, a wireless charging chip, a wake-up circuit, and a main control chip. The power management circuit is used to connect to a secondary battery and manage its charging and discharging. The first switching circuit is connected to the power management circuit and the wireless charging chip, and is used to turn the power management circuit and the wireless charging chip on or off. The standby power supply circuit is connected to the secondary battery and the wireless charging chip, and is used to output a first power supply signal to the wireless charging chip in standby mode. The wireless charging chip is used to connect to a coil, and is used to transmit a wireless charging signal through the coil when the coil induction signal is detected in standby mode. The wake-up circuit is used to output a wake-up signal. The main control chip is connected to the power management circuit, the standby power supply circuit, and the wake-up circuit, and is used to control the standby power supply circuit to stop working in low-power mode, and control the first switching circuit to turn off through the power management circuit; or, according to the wake-up signal, control the standby power supply circuit to work normally, and control the first switching circuit to turn on through the power management circuit. By reducing the energy loss of the power management circuit and the wireless charging chip in low-power mode, the standby power consumption of the wireless charging circuit is reduced. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of a wireless charging circuit in one embodiment of the present invention; Figure 2 This is a schematic diagram of the first switching circuit in one embodiment of the present invention; Figure 3 This is a schematic diagram of a standby power supply circuit in one embodiment of the present invention; Figure 4 This is a schematic diagram of a charging control circuit in one embodiment of the present invention.

[0017] In the diagram: 1. Secondary battery; 2. Wireless charging circuit; 21. Power management circuit; 22. First switch circuit; 23. Standby power supply circuit; 231. Voltage conversion circuit; 24. Wireless charging chip; 25. Wake-up circuit; 26. Main control chip; 27. Charging control circuit; 3. Coil; 4. Charging interface. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0019] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art.

[0020] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0021] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0022] This embodiment provides a wireless charging circuit 2, such as Figure 1 As shown, the system includes a power management circuit 21, a first switching circuit 22, a standby power supply circuit 23, a wireless charging chip 24, a wake-up circuit 25, and a main control chip 26. The power management circuit 21 is connected to the secondary battery 1 and manages its charging and discharging. The first switching circuit 22 is connected to the power management circuit 21 and the wireless charging chip 24, and is used to turn the power management circuit 21 and the wireless charging chip 24 on or off. The standby power supply circuit 23 is connected to the secondary battery 1 and the wireless charging chip 24, and is used to output a first power supply signal to the wireless charging chip 24 in standby mode. The wireless charging... Chip 24 is used to connect to coil 3 and to transmit a wireless charging signal through coil 3 when the coil 3 sensing signal is detected in standby mode; wake-up circuit 25 is used to output a wake-up signal; main control chip 26 is connected to power management circuit 21, standby power supply circuit 23 and wake-up circuit 25, and is used to control standby power supply circuit 23 to stop working in low power mode and control the first switch circuit 22 to turn off through power management circuit 21; or, according to the wake-up signal, control standby power supply circuit 23 to work normally and control the first switch circuit 22 to turn on through power management circuit 21.

[0023] The secondary battery 1 can be a lithium-ion battery or a sodium-ion battery. A wireless charging load refers to an electrical load with wireless charging functionality.

[0024] As an example, the power management circuit 21 is used to connect to the secondary battery 1 and manage its charging and discharging. Exemplarily, the power management circuit 21 can employ a multi-protocol bidirectional fast-charging power bank chip, such as the SW6201. The power management circuit 21 connects to a power adapter via the charging interface 4 to charge the secondary battery 1, or processes the output voltage of the secondary battery 1 to output an output voltage that meets the requirements of the wireless charging chip 24.

[0025] As an example, the first switching circuit 22 is connected to the power management circuit 21 and the wireless charging chip 24, and is used to turn the power management circuit 21 and the wireless charging chip 24 on or off. Exemplarily, when the wireless charging chip 24 senses a wireless charging load through the coil 3, for example, by detecting the Q value of the coil 3, and when the Q value changes, the first switching circuit 22 turns on the power management circuit 21 and the wireless charging chip 24, so that the wireless charging chip 24 can transmit a wireless charging signal based on the output voltage of the power management circuit 21. In low-power mode, for example, when the wireless charging circuit 2 has been in standby mode for more than 7 days, the first switching circuit 22 turns off the power management circuit 21 and the wireless charging chip 24 to reduce energy loss in the power management circuit 21 and the wireless charging chip 24.

[0026] As an example, the standby power supply circuit 23 is connected to the secondary battery 1 and the wireless charging chip 24, and is used to output a first power supply signal to the wireless charging chip 24 in standby mode. In this example, the first power supply signal is used to maintain the wireless charging chip 24 in performing intermittent Q-value detection, so that the wireless charging chip 24 can normally identify the wireless charging load in standby mode.

[0027] As an example, the wireless charging chip 24 is connected to the coil 3 and, when a coil 3 sensing signal is detected in standby mode, transmits a wireless charging signal through the coil 3. This coil 3 sensing signal is the Q-value transformation value of the coil 3.

[0028] As an example, wake-up circuit 25 is used to output a wake-up signal. Exemplarily, this wake-up signal can be triggered by the connection of a power adapter or by a button.

[0029] As an example, the main control chip 26 is connected to the power management circuit 21, the standby power supply circuit 23, and the wake-up circuit 25. In low-power mode, it controls the standby power supply circuit 23 to stop working and controls the first switch circuit 22 to turn off through the power management circuit 21, so as to reduce the energy loss of the standby power supply circuit 23 and the power management circuit 21 in low-power mode; or, according to the wake-up signal, it controls the standby power supply circuit 23 to work normally and controls the first switch circuit 22 to turn on through the power management circuit 21, so as to ensure that the wireless charging circuit 2 can be woken up and used normally.

[0030] Specifically, when the wireless charging circuit 2 detects neither the power adapter nor the wireless charging load, it enters standby mode. The standby power supply circuit 23 outputs a first power supply signal to the wireless charging chip 24, enabling the wireless charging chip 24 to normally identify the wireless charging load in standby mode. When a wireless charging load is detected in standby mode, the power management circuit 21 processes the output voltage of the secondary battery 1 and outputs an output voltage that meets the requirements of the wireless charging chip 24. The wireless charging chip 24 then charges the wireless charging load by transmitting a wireless charging signal through the coil 3 based on the output voltage of the power management circuit 21. When no wireless charging load is detected in standby mode and the standby time exceeds 7 days, the wireless charging circuit 2 enters low-power mode. The main control chip 26 controls the standby power supply circuit 23 to stop working and controls the first switching circuit 22 to disconnect through the power management circuit 21, thereby greatly reducing the power consumption of the wireless charging circuit 2. When the user triggers a wake-up signal through the wake-up circuit 25, the main control chip 26 controls the standby power supply circuit 23 to work normally and controls the first switching circuit 22 to turn on through the power management circuit 21, thereby switching from low-power mode to standby mode.

[0031] In this embodiment, the wireless charging circuit 2 includes a power management circuit 21, a first switching circuit 22, a standby power supply circuit 23, a wireless charging chip 24, a wake-up circuit 25, and a main control chip 26. The power management circuit 21 is connected to the secondary battery 1 and manages its charging and discharging. The first switching circuit 22 is connected to the power management circuit 21 and the wireless charging chip 24 and is used to turn the power management circuit 21 and the wireless charging chip 24 on or off. The standby power supply circuit 23 is connected to the secondary battery 1 and the wireless charging chip 24 and is used to output a first power supply signal to the wireless charging chip 24 in standby mode. The wireless charging chip 24 is connected to the coil 3 and is used to detect... When the coil 3 sensing signal is detected, a wireless charging signal is emitted through the coil 3; the wake-up circuit 25 is used to output a wake-up signal; the main control chip 26 is connected to the power management circuit 21, the standby power supply circuit 23 and the wake-up circuit 25, and is used to control the standby power supply circuit 23 to stop working in low power mode, and control the first switch circuit 22 to turn off through the power management circuit 21; or, according to the wake-up signal, control the standby power supply circuit 23 to work normally, and control the first switch circuit 22 to turn on through the power management circuit 21, thereby reducing the energy loss of the power management circuit 21 and the wireless charging chip 24 in low power mode, and thus reducing the standby power consumption of the wireless charging circuit 2.

[0032] In one embodiment, the first switching circuit 22 includes a first switching transistor Q1 and a second switching transistor Q2; the first terminal of the first switching transistor Q1 is connected to the voltage output terminal of the power management circuit 21, the first terminal of the second switching transistor Q2 is connected to the wireless charging chip 24, and the second terminals of the first switching transistor Q1 and the second switching transistor Q2 are connected to the voltage detection terminal of the power management circuit 21; the first control terminal of the power management circuit 21 is connected to the third terminal of the first switching transistor Q1 and the third terminal of the second switching transistor Q2, respectively.

[0033] As an example, when in standby mode, the first control terminal of the power management circuit 21 controls both the first switch Q1 and the second switch Q2 to be turned on. The output voltage of the power management circuit 21 is output to the wireless charging chip 24 through the turned-on first switch Q1 and the turned-on second switch Q2. The voltage detection terminal of the power management circuit 21 detects the output voltage for adjusting the output voltage.

[0034] It should be noted that since the power management circuit 21, such as the voltage detection terminal of a multi-protocol bidirectional fast charging power bank chip, typically outputs a voltage of 2.5V, if the first switching circuit 22 uses a single switching transistor, the voltage detection terminal and the power supply terminal of the wireless charging chip 24 need to be connected together. Thus, when the power supply terminal of the wireless charging chip 24 stops working in the standby power supply circuit 23, it will pull down the voltage detection terminal of the standby power supply circuit 23, causing the power management circuit 21 to instruct the main control chip 26 to control the standby power supply circuit 23 to work, preventing the power management circuit 21 and the wireless charging chip 24 from entering low-power mode. Therefore, this application connects the second terminal of the first switching transistor Q1 and the second terminal of the second switching transistor Q2 together to the voltage detection terminal of the power management circuit 21. This isolates the wireless charging chip 24 and the voltage detection terminal of the power management circuit 21 through the second switching transistor Q2, thereby ensuring that the wireless charging circuit 2 can normally enter low-power mode.

[0035] In one embodiment, such as Figure 2 As shown, both the first switch Q1 and the second switch Q2 are MOSFETs; the channel type of the first switch Q1 is the same as that of the second switch Q2; the first terminal of the first switch Q1 is the drain, the second terminal of the first switch Q1 is the source, and the third terminal of the first switch Q1 is the gate; the first terminal of the second switch Q2 is the drain, the second terminal of the second switch Q2 is the source, and the third terminal of the second switch Q2 is the gate.

[0036] In this embodiment, both the first switch Q1 and the second switch Q2 are MOSFETs; the channel type of the first switch Q1 is the same as that of the second switch Q2, thereby reducing the cost by using the same type of switch.

[0037] In one embodiment, such as Figure 3 As shown, the standby power supply circuit 23 includes a third switch Q7 and a voltage conversion circuit 231. The first terminal of the third switch Q7 is connected to the secondary battery 1, the second terminal of the third switch Q7 is connected to the voltage conversion circuit 231, and the third terminal of the third switch Q7 is connected to the main control chip 26. The third switch Q7 is turned on in standby mode and turned off in low power mode. The voltage conversion circuit 231 is connected to the wireless charging chip 24 and is used to convert the output voltage of the secondary battery 1 and output the first power supply signal when the third switch Q7 is turned on.

[0038] As an example, in standby mode, the main control chip 26 controls the third switch Q7 to turn on, thereby enabling the voltage conversion circuit 231 to convert the output voltage of the secondary battery 1 and output the first power supply signal value to the wireless charging chip 24. In low-power mode, the main control chip 26 controls the third switch Q7 to turn off, thereby reducing power consumption.

[0039] For example, the third switch Q7 is a MOSFET, such as a PMOS. The first terminal of the third switch Q7 is the source, the second terminal of the third switch Q7 is the drain, and the third terminal of the third switch Q7 is the gate.

[0040] Optionally, the standby power supply circuit 23 further includes an input filter capacitor C47, a first voltage divider resistor R40, a second voltage divider resistor R53, a resonant capacitor C51, a resonant inductor L2, a reverse diode D5, an output filter capacitor C49, and an output filter capacitor C50. The main control chip 26 is connected to the third terminal of the third switching transistor Q7 through the second voltage divider resistor R53.

[0041] In one embodiment, the voltage conversion circuit 231 includes a low-dropout linear regulator U6 to ensure the stability of the output first power supply signal, thereby ensuring the stability of the wireless charging chip 24.

[0042] In one embodiment, the wireless charging circuit 2 includes a charging interface 4; the charging interface 4 is connected to the power management circuit 21 and is used to connect a power adapter and output a charging signal to the power management circuit 21.

[0043] For example, the charging interface 4 can be a Type-C interface. In this embodiment, when the voltage adapter is connected to the power adapter, a charging signal is generated to the power management circuit 21, which then charges the secondary battery 1. Further, in low-power mode, when the charging interface 4 is connected to the power adapter, the power management circuit 21 communicates with the main control chip 26 via the IIC protocol. The power management circuit 21 outputs a power adapter access signal to the main control chip 26, which uses this signal as a wake-up signal to switch from low-power mode to standby mode.

[0044] In one embodiment, the wake-up circuit 25 includes a push-button switch; the first end of the push-button switch is connected to the main control chip 26, and the second end of the push-button switch is grounded.

[0045] In this embodiment, when the push-button switch is pressed, it connects the main control chip 26 to ground, thereby triggering a wake-up signal, i.e., a low-level signal. The first terminal of the push-button switch is connected to the main control chip 26, and the second terminal is grounded. This wake-up signal triggering structure is simple and low-cost.

[0046] In one embodiment, the wireless charging circuit 2 further includes a charging control circuit 27; the charging control circuit 27 is connected to the charging interface 4, the main control chip 26 and the wireless charging chip 24, and is used to turn on the charging interface 4 and the wireless charging chip 24 in charging mode.

[0047] In this embodiment, when the power adapter is connected to the charging interface 4, the wireless charging chip 24 can be powered directly through the charging control circuit 27, thus eliminating the need to draw power from the secondary battery 1. This ensures that the wireless charging load is charged normally when the secondary battery 1 has a low power level.

[0048] In one embodiment, such as Figure 4 As shown, the charging control circuit 27 includes a fourth switch Q3, a fifth switch Q4, a sixth switch Q5, a first resistor R33, and a second resistor R34. The first end of the fourth switch Q3 is connected to the charging interface 4, the second end of the fourth switch Q3 is connected to the first end of the fifth switch Q4, and the second end of the fifth switch Q4 is connected to the wireless charging chip 24. The first end of the first resistor R33 is connected to the second ends of the fourth switch Q3 and the fifth switch Q4, the second end of the first resistor R33 is connected to the third ends of the fourth switch Q3, the third end of the fifth switch Q4, and the first end of the second resistor R34. The first end of the sixth switch Q5 is connected to the second end of the second resistor R34, the second end of the sixth switch Q5 is grounded, and the third end of the sixth switch Q5 is connected to the main control chip 26.

[0049] In this transistor configuration, the fourth switch Q3, the fifth switch Q4, and the sixth switch Q5 are all MOSFETs. For example, the fourth switch Q3 and the fifth switch Q4 are PMOS transistors, and the sixth switch Q5 is an NMOS transistor. The first terminal of the fourth switch Q3 is the drain, the second terminal is the source, and the third terminal is the gate. The first terminal of the fifth switch Q4 is the source, the second terminal is the drain, and the third terminal is the gate. The first terminal of the sixth switch Q5 is the drain, the second terminal is the source, and the third terminal is the gate.

[0050] In this embodiment, when the power adapter is connected to the charging interface 4, the main control chip 26 controls the sixth switch Q5 to turn on, thereby turning on the fourth switch Q3 and the fifth switch Q4. The charging interface 4 is connected to the wireless charging chip 24, and the wireless charging chip 24 can be powered directly through the charging control circuit 27. Therefore, it is not necessary to draw power from the secondary battery 1, so as to ensure that the wireless charging load is charged normally when the secondary battery 1 has a low power.

[0051] This embodiment provides a mobile wireless charging device, including a secondary battery 1, a coil 3, and the aforementioned wireless charging circuit 2; the secondary battery 1 is connected to a power management circuit 21 and a standby power supply circuit 23; the coil 3 is connected to a wireless charging chip 24.

[0052] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A wireless charging circuit, comprising: It includes a power management circuit, a first switch circuit, a standby power supply circuit, a wireless charging chip, a wake-up circuit, and a main control chip; The power management circuit is used to connect to the secondary battery and manage the charging and discharging of the secondary battery; The first switching circuit is connected to the power management circuit and the wireless charging chip, and is used to turn the power management circuit and the wireless charging chip on or off; The standby power supply circuit is connected to the secondary battery and the wireless charging chip, and is used to output a first power supply signal to the wireless charging chip in standby mode; The wireless charging chip is used to connect to the coil and to transmit a wireless charging signal through the coil when the coil induction signal of the coil is detected in the standby mode. The wake-up circuit is used to output a wake-up signal; The main control chip is connected to the power management circuit, the standby power supply circuit, the wireless charging chip, and the wake-up circuit. In low-power mode, it controls the standby power supply circuit to stop working and controls the first switching circuit to disconnect through the power management circuit; or, according to the wake-up signal, it controls the standby power supply circuit to work normally and controls the first switching circuit to turn on through the power management circuit.

2. The wireless charging circuit of claim 1, wherein, The first switching circuit includes a first switching transistor and a second switching transistor; The first terminal of the first switching transistor is connected to the voltage output terminal of the power management circuit, the first terminal of the second switching transistor is connected to the wireless charging chip, and the second terminals of the first and second switching transistors are connected together to the voltage detection terminal of the power management circuit. The first control terminal of the power management circuit is connected to the third terminal of the first switching transistor and the third terminal of the second switching transistor, respectively.

3. The wireless charging circuit of claim 2, wherein, Both the first and second switching transistors are MOSFETs; the channel type of the first switching transistor is the same as that of the second switching transistor. The first terminal of the first switch is the drain, the second terminal of the first switch is the source, and the third terminal of the first switch is the gate; the first terminal of the second switch is the drain, the second terminal of the second switch is the source, and the third terminal of the second switch is the gate.

4. The wireless charging circuit of claim 1, wherein, The standby power supply circuit includes a third switching transistor and a voltage conversion circuit; The first terminal of the third switch is connected to the secondary battery, the second terminal of the third switch is connected to the voltage conversion circuit, and the third terminal of the third switch is connected to the main control chip. The third switch is turned on in the standby mode and turned off in the low power mode. The voltage conversion circuit is connected to the wireless charging chip and is used to convert the output voltage of the secondary battery and output the first power supply signal when the third switch is turned on.

5. The wireless charging circuit of claim 4, wherein, The voltage conversion circuit includes a low-dropout linear regulator.

6. The wireless charging circuit of claim 1, wherein, The wireless charging circuit includes a charging interface; the charging interface is connected to the power management circuit and is used to connect a power adapter and output a charging signal to the power management circuit.

7. The wireless charging circuit of claim 1, wherein, The wake-up circuit includes a push-button switch; the first end of the push-button switch is connected to the main control chip, and the second end of the push-button switch is grounded.

8. The wireless charging circuit of claim 6, wherein, The wireless charging circuit also includes a charging control circuit; the charging control circuit is connected to the charging interface, the main control chip and the wireless charging chip, and is used to turn on the charging interface and the wireless charging chip in charging mode.

9. The wireless charging circuit of claim 8, wherein, The charging control circuit includes a fourth switch, a fifth switch, a sixth switch, a first resistor, and a second resistor; The first end of the fourth switch is connected to the charging interface, the second end of the fourth switch is connected to the first end of the fifth switch, and the second end of the fifth switch is connected to the wireless charging chip. The first end of the first resistor is connected to the second end of the fourth switch and the first end of the fifth switch, and the second end of the first resistor is connected to the third end of the fourth switch, the third end of the fifth switch, and the first end of the second resistor. The first terminal of the sixth switch is connected to the second terminal of the second resistor, the second terminal of the sixth switch is grounded, and the third terminal of the sixth switch is connected to the main control chip.

10. A mobile wireless charging device, comprising: It includes a secondary battery, a coil, and a wireless charging circuit as described in any one of claims 1 to 9; the secondary battery is connected to the power management circuit and the standby power supply circuit; the coil is connected to the wireless charging chip.

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