CN211377677U

CN211377677U - Wireless charging circuit

Info

Publication number: CN211377677U
Application number: CN202020032796.XU
Authority: CN
Inventors: 吴小莉
Original assignee: 吴小莉
Current assignee: SHANGHAI QIANGSONG AEROSPACE TECHNOLOGY Co.,Ltd.
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-08-28
Anticipated expiration: 2030-01-08

Abstract

The utility model discloses a wireless charging circuit, including main control unit MCU, coil detection circuit, BUCK step-down power supply circuit, power access circuit, input voltage detection circuit, status indication circuit, drive circuit, main control unit MCU's VDD end is connected the 5V power, main control unit MCU's VSS end ground connection, be connected through electric capacity C45 between main control unit MCU's VDD end and the VSS end; the coil detection circuit is connected with the main controller MCU and is also connected with the transmitting coil; one end of the voltage-reducing power supply circuit is connected with a power supply voltage input end, and the other end of the voltage-reducing power supply circuit is connected with a 5V power supply; the utility model provides a wireless charging circuit can realize higher charging speed, also can reduce the consumption when promoting the charge efficiency of wireless charging transmitting terminal.

Description

Wireless charging circuit

Technical Field

The utility model relates to the wireless technical field that charges especially involves a wireless charging circuit.

Background

Wireless charging technology (Wireless charging technology) is derived from Wireless power transmission technology, and can be classified into an electromagnetic induction type, a magnetic field resonance type and a radio wave type according to a charging principle, electromagnetic induction type is often adopted for low-power Wireless charging, for example, Wireless charging for charging a mobile phone, and the electromagnetic induction type Wireless charging principle is as follows, alternating current with a certain frequency of a primary coil generates a certain current in a secondary coil through electromagnetic induction, so that energy is transferred from a transmission end to a receiving end. At present, the most common charging solution adopts electromagnetic induction, and because the charger and the electric device transmit energy through a magnetic field and are not connected through wires, the charger and the electric device can be exposed without conductive contacts.

At present, wireless charging equipment, wireless charger's the speed of charging is lower, and charge efficiency is low and the consumption is great, and it is one of the problems that the industry needs to solve how to make the user enjoy wireless convenient improvement the speed of charging simultaneously that charges.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a wireless charging circuit through set up BUCK step-down supply circuit in wireless charging circuit, can convert the external power supply who connects through power input circuit to 5V's steady voltage provides each circuit to can realize having higher charge speed, also can reduce the consumption when promoting wireless charging circuit's charge efficiency, realized overcurrent protection, status indication, short-circuit protection, it is more convenient to charge safely, intelligent degree is higher.

The technical scheme of the utility model as follows:

a wireless charging circuit comprises a main controller MCU, a coil detection circuit, a BUCK voltage reduction power supply circuit, a power supply access circuit, an input voltage detection circuit, a state indication circuit and a drive circuit, wherein one end of the power supply access circuit is connected with an external power supply, and the other end of the power supply access circuit is respectively connected with the BUCK voltage reduction power supply circuit and the drive circuit; the coil detection circuit is respectively connected with the main controller MCU and the BUCK voltage reduction power supply circuit, and is also connected with the transmitting coil; the voltage reduction power supply circuit is connected with the input voltage detection circuit, and the input voltage detection circuit is also connected with the main controller MCU; the state indicating circuit is respectively connected with the BUCK voltage reduction power supply circuit and the main controller MCU, and the driving circuit is also connected with the BUCK voltage reduction power supply circuit, the main controller MCU and the transmitting coil.

Further, the coil detection circuit comprises a converter U6, a resistor R6, a resistor 41, a resistor 42, a resistor 43, a resistor R6, a capacitor C6 and a capacitor D6, wherein one end of the resistor R6 is connected with a 5V power supply, the other end of the resistor R6 is connected with a 4 th pin of the converter U6, a 11 th pin of the converter U6 is grounded, the other end of the resistor R6 is also connected with one end of the capacitor C6, the other end of the capacitor C6 is grounded, the capacitor C6 is connected with the capacitor C6 in parallel, a 4 th pin and a 3 rd pin of the converter U6 are connected with a negative pole of the converter C6 through the resistor R6, the capacitor D6, the 3 rd pin of the converter is also grounded through the resistor R42, the anode of the D3 is connected with the transmitting coil through a resistor R41, the cathode of the D3 is grounded through a capacitor C44, one end of the resistor R43 is connected with the cathode of the D3, and the other end of the resistor R43 is grounded; the 1 st stitch and the 2 nd stitch of converter all are connected with the one end of resistance R45, the other end of resistance R45 with the 6 th stitch of converter is connected, the 6 th stitch of converter still passes through electric capacity C46 ground connection, the 5 th stitch of converter with the one end of resistance R51 is connected, the other end of resistance R51 passes through electric capacity C49 ground connection, be connected through resistance R50 between the 5 th stitch and the 7 th stitch of converter, the 7 th stitch of converter still is connected with the one end of resistance R47, the other end of resistance R47 is connected with electric capacity C47, resistance R46, the one end of resistance R48 respectively, the other end ground connection of electric capacity C47, the other end of resistance R46 and resistance R48 respectively with the 10 th and the 9 th stitch of converter, the 9 th stitch of converter still passes through electric capacity C48 ground connection, connect through resistance R44 between the 10 th stitch and the 8 th stitch of converter, the 8 th pin of the converter is connected with the 19 th pin of the main controller MCU, and the 8 th pin of the converter is grounded through a resistor R49.

Further, the BUCK voltage supply circuit includes an integrated circuit U1, a resistor R3, a resistor R4, and a resistor R5, a 5 th pin of the integrated circuit U1 is connected to a power supply voltage input terminal, a 5 th pin of the integrated circuit U1 is further grounded through a capacitor C9 and a capacitor C10, a 5 th pin and a 4 th pin of the integrated circuit U1 are connected through the resistor R3, a 2 nd pin of the integrated circuit U1 is grounded, a1 st pin and a 6 th pin of the integrated circuit U1 are connected through a capacitor C1, a 6 th pin of the integrated circuit U1 is further connected to a1 st terminal of L1, a 2 nd terminal of L1 is connected to a 5V power supply, a 2 nd terminal of L1 is further connected to one end of a resistor R4, the other end of the resistor R4 is connected to a 3 rd pin of the integrated circuit U1, the resistor R4 is connected in parallel to the capacitor C11, and the other end of the resistor R4 is further grounded through a resistor R5, the 2 nd terminal of the L1 is also grounded through a capacitor C12 and a capacitor C13, respectively.

Further, the power access circuit comprises sockets J1, L2, L3, a capacitor C17, a capacitor C18 and a capacitor C19, one end of the L2 is connected with the 1 st pin of the socket J1, the 1 st pin of the socket J1 is connected with the 3 rd pin of the socket J1 through the capacitor C17, the other end of the L2 is grounded through the capacitor C19 and the capacitor C18, the 3 rd pin of the socket J1 is grounded through the L3, and the other end of the L2 is further connected with a power voltage input end.

Further, the input voltage detection circuit comprises a resistor R37, a resistor R38 and a capacitor C40, one end of the resistor R37 is connected with a power supply voltage input end, the other end of the resistor R37 is connected with the ground through a resistor R38 and a capacitor C40, and the other end of the resistor R37 is connected with a 2 nd pin of the main controller MCU.

Further, the status indication circuit includes an integrated circuit U5, a 19 th pin of the integrated circuit U5 is connected to a 12 th pin of the main controller MCU, a 19 th pin of the integrated circuit U5 is further connected to an 18 th pin of the integrated circuit U5 through a resistor R32, a 20 th pin of the integrated circuit U5 is connected to an 18 th pin of the integrated circuit U5 through a resistor R31, an 18 th pin of the integrated circuit U5 is connected to a 5V power supply, a1 st pin of the integrated circuit U5 is connected to a 2 nd pin, a 2 nd pin of the integrated circuit U5 is connected to a 3 rd pin, a1 st pin and a 4 th pin of the integrated circuit U5 are connected to a capacitor C36, a 3 rd pin and a 17 th pin of the integrated circuit U5 are connected to a 17 th pin of the integrated circuit U5 are connected to a 21 th pin, a 4 th pin and a 18 th pin of the integrated circuit U5 are connected to a resistor R36, the 21 st pin of the integrated circuit U5 is grounded, the 9 th pin of the integrated circuit U5 is grounded after being connected with the resistor R23 and the LED8 in series, the 10 th pin of the integrated circuit U5 is grounded after being connected with the resistor R24 and the LED7 in series, the 11 th pin of the integrated circuit U5 is grounded after being connected with the resistor R25 and the LED6 in series, the 12 th pin of the integrated circuit U5 is grounded after being connected with the resistor R27 and the LED5 in series, the 13 th pin of the integrated circuit U5 is grounded after being connected with the resistor R29 and the LED4 in series, the 14 th pin of the integrated circuit U5 is grounded after being connected with the resistor R33 and the LED3 in series, the 15 th pin of the integrated circuit U5 is grounded after being connected with the resistor R34 and the LED2 in series, and the 16 th pin of the integrated circuit U5 is grounded after being connected with the resistor R35.

Has the advantages that: compared with the prior art, the utility model provides a pair of wireless charging circuit, through set up BUCK step-down supply circuit in wireless charging circuit, can convert the external power supply who connects through power input circuit into 5V's steady voltage and provide each circuit, and through input voltage detection circuit and coil detection circuit, voltage and electric current in the detection circuitry, MOSFET drive circuit and H bridge resonant circuit control drive transmitting coil in through drive circuit by main control unit MCU, can realize having higher charge speed, also can reduce the consumption when promoting wireless charging circuit's charge efficiency, overcurrent protection has been realized, the state is instructed, short-circuit protection, it is safe convenient to charge, intelligent degree is higher.

Drawings

For a clearer explanation of the embodiments or technical solutions in the prior art, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a schematic diagram of the main controller MCU and part of the peripheral circuits of the present invention;

fig. 3 is a schematic circuit connection diagram of the coil detection circuit of the present invention;

FIG. 4 is a schematic diagram of the circuit connection of the BUCK voltage-reducing power supply circuit of the present invention;

fig. 5 is a schematic circuit connection diagram of the power supply connection circuit of the present invention;

fig. 6 is a schematic circuit connection diagram of the input voltage detection circuit according to the present invention;

fig. 7 is a schematic circuit connection diagram of the status indication circuit of the present invention;

fig. 8 is a schematic circuit diagram of the driving circuit according to the present invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As shown in fig. 1 to 8, a wireless charging circuit includes a main controller MCU1, a coil detection circuit 2, a BUCK voltage-reducing power supply circuit 3, a power supply access circuit 4, an input voltage detection circuit 5, a state indication circuit 6, and a driving circuit 7, wherein a VDD terminal of the main controller MCU is connected to a 5V power supply, a VSS terminal of the main controller MCU is grounded, and the VDD terminal and the VSS terminal of the main controller MCU are connected through a capacitor C45; one end of the power supply access circuit 4 is connected with an external power supply, and the other end of the power supply access circuit 4 is respectively connected with the BUCK voltage reduction power supply circuit 3 and the drive circuit 7; the coil detection circuit 2 is respectively connected with the master controller MCU1 and the BUCK voltage reduction power supply circuit 3, and the coil detection circuit 2 is also connected with a transmitting coil 8; the step-down power supply circuit 3 is connected with the input voltage detection circuit 5, and the input voltage detection circuit 5 is also connected with the main controller MCU 1; the state indicating circuit 6 is respectively connected with the BUCK voltage-reducing power supply circuit 3 and the master controller MCU1, and the driving circuit 7 is also connected with the BUCK voltage-reducing power supply circuit 3, the master controller MCU1 and the transmitting coil 8; in addition, the wireless charging circuit further comprises a temperature detection circuit 9, a 5V filter circuit 10, a reset circuit 11, a first filter circuit 12, a buzzer circuit 13, a first voltage detection circuit 14 and a main controller MCU burning interface 15, the temperature detection circuit 9 is respectively connected with the BUCK voltage reduction power supply circuit 3 and the main controller MCU1, the 5V filter circuit 10 is connected with the BUCK voltage reduction power supply circuit 4, the reset circuit 11 is connected with the main controller MCU1, the first filter circuit 12 is connected with the main controller MCU1, the buzzer circuit 13 is respectively connected with the BUCK voltage reduction power supply circuit 4 and the main controller MCU1, the first voltage detection circuit 14 is connected with the master controller MCU1, the master controller MCU burning interface 15 is also connected with the master controller MCU1, and the transmitting coil is not limited.

Further, the coil detection circuit 3 includes a converter U6, a resistor R6, a resistor 41, a resistor 42, a resistor 43, a resistor R6, a capacitor C6, and a capacitor D6, one end of the resistor R6 is connected to a 5V power supply, the other end of the resistor R6 is connected to the 4 th pin of the converter U6, the 11 th pin of the converter U6 is grounded, the other end of the resistor R6 is further connected to one end of the capacitor C6, the other end of the capacitor C6 is grounded, the capacitor C6 is connected to the capacitor C6 in parallel, the 4 th pin of the converter U6 is connected to the 3 rd pin, and the negative electrode of the converter U6 is connected to the pin 6 through the capacitor C6, the 3 rd pin of the converter is also grounded through the resistor R42, the anode of the D3 is connected with the transmitting coil through a resistor R41, the cathode of the D3 is grounded through a capacitor C44, one end of the resistor R43 is connected with the cathode of the D3, and the other end of the resistor R43 is grounded; the 1 st stitch and the 2 nd stitch of converter all are connected with the one end of resistance R45, the other end of resistance R45 with the 6 th stitch of converter is connected, the 6 th stitch of converter still passes through electric capacity C46 ground connection, the 5 th stitch of converter with the one end of resistance R51 is connected, the other end of resistance R51 passes through electric capacity C49 ground connection, be connected through resistance R50 between the 5 th stitch and the 7 th stitch of converter, the 7 th stitch of converter still is connected with the one end of resistance R47, the other end of resistance R47 is connected with electric capacity C47, resistance R46, the one end of resistance R48 respectively, the other end ground connection of electric capacity C47, the other end of resistance R46 and resistance R48 respectively with the 10 th and the 9 th stitch of converter, the 9 th stitch of converter still passes through electric capacity C48 ground connection, connect through resistance R44 between the 10 th stitch and the 8 th stitch of converter, the 8 th pin of the converter is connected with the 19 th pin of the main controller MCU, and the 8 th pin of the converter is grounded through a resistor R49.

Further, the BUCK voltage supply circuit 4 includes an integrated circuit U1, a resistor R3, a resistor R4, and a resistor R5, a 5 th pin of the integrated circuit U1 is connected to the power supply voltage input terminal, a 5 th pin of the integrated circuit U1 is further grounded through a capacitor C9 and a capacitor C10, a 5 th pin and a 4 th pin of the integrated circuit U1 are connected through the resistor R3, a 2 nd pin of the integrated circuit U1 is grounded, a1 st pin and a 6 th pin of the integrated circuit U1 are connected through a capacitor C1, a 6 th pin of the integrated circuit U1 is further connected to a1 st terminal of L1, a 2 nd terminal of L1 is connected to the 5V power supply, a 2 nd terminal of L1 is further connected to one end of a resistor R4, the other end of the resistor R4 is connected to a 3 rd pin of the integrated circuit U1, the resistor R4 is connected to the capacitor C11, and the other end of the resistor R4 is further grounded through a resistor R5, the 2 nd terminal of the L1 is also grounded through a capacitor C12 and a capacitor C13, respectively.

Further, the power access circuit 5 includes a socket J1, an L2, an L3, a capacitor C17, a capacitor C18, and a capacitor C19, one end of the L2 is connected to a1 st pin of the socket J1, the 1 st pin of the socket J1 is connected to a 3 rd pin of the socket J1 through the capacitor C17, the other end of the L2 is grounded through the capacitor C19 and the capacitor C18, the 3 rd pin of the socket J1 is grounded through the L3, and the other end of the L2 is further connected to a power voltage input terminal.

Further, the input voltage detection circuit 6 includes a resistor R37, a resistor R38, and a capacitor C40, one end of the resistor R37 is connected to the power voltage input terminal, the other end of the resistor R37 is connected to the ground via the resistor R38 and the capacitor C40, and the other end of the resistor R37 is connected to the 2 nd pin of the main controller MCU.

Further, the status indication circuit 7 includes an integrated circuit U5, a 19 th pin of the integrated circuit U5 is connected to a 12 th pin of the main controller MCU, a 19 th pin of the integrated circuit U5 is also connected to an 18 th pin of the integrated circuit U5 through a resistor R32, a 20 th pin of the integrated circuit U5 is connected to an 18 th pin of the integrated circuit U5 through a resistor R31, an 18 th pin of the integrated circuit U5 is connected to a 5V power supply, a1 st pin of the integrated circuit U5 is connected to a 2 nd pin, a 2 nd pin of the integrated circuit U5 is connected to a 3 rd pin, a1 st pin and a 4 th pin of the integrated circuit U5 are connected to a capacitor C36, a 3 rd pin and a 17 th pin of the integrated circuit U5 are connected to a 17 th pin of the integrated circuit U5 are connected to a 21 th pin, a 4 th pin and a 18 th pin of the integrated circuit U5 are connected to a resistor R36, the 21 st pin of the integrated circuit U5 is grounded, the 9 th pin of the integrated circuit U5 is grounded after being connected with the resistor R23 and the LED8 in series, the 10 th pin of the integrated circuit U5 is grounded after being connected with the resistor R24 and the LED7 in series, the 11 th pin of the integrated circuit U5 is grounded after being connected with the resistor R25 and the LED6 in series, the 12 th pin of the integrated circuit U5 is grounded after being connected with the resistor R27 and the LED5 in series, the 13 th pin of the integrated circuit U5 is grounded after being connected with the resistor R29 and the LED4 in series, the 14 th pin of the integrated circuit U5 is grounded after being connected with the resistor R33 and the LED3 in series, the 15 th pin of the integrated circuit U5 is grounded after being connected with the resistor R34 and the LED2 in series, and the 16 th pin of the integrated circuit U5 is grounded after being connected with the resistor R35.

As shown in fig. 8, the driving circuit includes a MOSFET driving circuit, an H-bridge resonant circuit and a current detection circuit, the MOSFET driving circuit comprises U3 and U4, the 1 st pins of the U3 and the U4 are respectively connected with the 7 th pins of the U3 and the U4 through a capacitor C16 and a capacitor C25, the 4 th pins of the U3 and the U4 are connected with the power access circuit, the 3 rd pins of the U3 and the U4 are connected with the MCU, the 2 nd pins of the U3 and the U4 are respectively connected with the main controller MCU through a resistor R10 and a resistor R18, the 6 th pins of the U3 and the U4 are grounded, the 8 th pins of the U3 and the U4 are connected with the H-bridge resonant circuit through a resistor R8 and a resistor 17 respectively, the 7 th pins of the U3 and the U4 are connected with the H bridge resonant circuit, and the 5 th pins of the U3 and the U4 are connected with the H bridge resonant circuit through a resistor R11 and a resistor R19 respectively; the H-bridge resonant circuit comprises Q1, Q2, Q4 and Q5, and the specific connection is as shown in FIG. 8; the current detection circuit includes U2, U2 adopts the current sampling amplifier that the model is TP199A1C/2C for the current test, U2's 3 rd stitch with BUCK step-down supply circuit connects, U2's 4 th stitch is connected the power access circuit, connect through resistance R1 between U2's 4 th stitch and the 5 th stitch U2's 6 th stitch pass through resistance R22 with main control unit MCU's 20 th stitch is connected, main control unit MCU's 20 th stitch ground, U2's 1 st stitch and 2 nd stitch ground.

In the wireless charging circuit, the main controller MCU controls the driving circuit to drive the transmitting coil to work, the single chip microcomputer can adopt STM8S003F3 in model, the power access circuit is powered by an external power supply and provides 5V stable voltage for the main controller MCU and the state display circuit through the BUCK voltage reduction power supply circuit, and the state display circuit is used for displaying whether the charging state of a load (the load can be a charging battery, and handheld electronic equipment such as a mobile phone, a video camera, a camera, an MP3 player, an MP4 player and the like) at a wireless charging receiving end is finished or not; as shown in fig. 8, when the driving circuit operates, the PWM port of the main controller MCU outputs a pulse width modulation signal to drive the MOSFET driving circuits of MOS transistors U3 and U4 of NCP3420DR2G, and the pulse width modulation signal is amplified to drive the transmitting coil via the H-bridge resonant circuit formed by the elements Q1 and Q2, Q4, and Q5 of AON3414, so that the charging efficiency of the wireless charging circuit is improved and the power consumption is reduced; when the main controller MCU outputs high-frequency square waves (PWM), the transmission coil generates electromagnetic waves after amplification, the electromagnetic waves radiate outwards through the coil in the transmission coil, the transmission coil also receives feedback information from a wireless charging receiving end, the main controller MCU reads current in a circuit through a current detection circuit consisting of resistors R1 and U2, the current is rectified and filtered through the coil detection circuit according to current change and is output to the main controller for sampling, the working state of the wireless charging receiving end is judged through the main controller MCU, the working state of the circuit is controlled according to the obtained information, if the charging current and the voltage of a load of the wireless charging receiving end are both too low, the duty ratio of the output PWM signals is adjusted, and the charging current of the load is increased; if the load at the wireless charging receiving end is charged or no-load, the power is turned off, the electromagnetic waves are stopped being transmitted, and the wireless charging receiving end enters a standby state, namely a low-power consumption state, so that the problem of large no-load loss is solved.

Has the advantages that: compared with the prior art, the utility model provides a pair of wireless charging circuit, through set up BUCK step-down supply circuit in wireless charging circuit, can convert the external power supply who connects through power input circuit into 5V's steady voltage and provide each circuit, and through input voltage detection circuit and coil detection circuit, voltage and electric current among the detection circuitry, MOSFET drive circuit and H bridge resonant circuit control drive transmitting coil in through drive circuit by main control unit MCU, can realize having higher charging speed under the condition of ordinary charger power supply, promote wireless charging circuit's charge efficiency and reduce the consumption, overcurrent protection has been realized, the state indication, short-circuit protection, temperature detects, it is safe convenient more to charge, intelligent degree is higher.

It should be noted that the above technical features are continuously combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; moreover, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.

Claims

1. A wireless charging circuit is characterized by comprising a main controller MCU, a coil detection circuit, a BUCK voltage reduction power supply circuit, a power supply access circuit, an input voltage detection circuit, a state indication circuit and a drive circuit, wherein one end of the power supply access circuit is connected with an external power supply, and the other end of the power supply access circuit is respectively connected with the BUCK voltage reduction power supply circuit and the drive circuit; the coil detection circuit is respectively connected with the main controller MCU and the BUCK voltage reduction power supply circuit, and is also connected with the transmitting coil; the voltage reduction power supply circuit is connected with the input voltage detection circuit, and the input voltage detection circuit is also connected with the main controller MCU; the state indicating circuit is respectively connected with the BUCK voltage reduction power supply circuit and the main controller MCU, and the driving circuit is also connected with the BUCK voltage reduction power supply circuit, the main controller MCU and the transmitting coil.

2. The wireless charging circuit according to claim 1, wherein the coil detection circuit comprises a converter U6, a resistor R6, a resistor 41, a resistor 42, a resistor 43, a resistor R6, a resistor C6, a capacitor D6, one end of the resistor R6 is connected to a 5V power supply, the other end of the resistor R6 is connected to a 4 th pin of the converter U6, an 11 th pin of the converter U6 is grounded, the other end of the resistor R6 is further connected to one end of the capacitor C6, the other end of the capacitor C6 is grounded, the capacitor C6 is connected to the capacitor C6 in parallel, a second pin of the converter U6 is connected to a negative pole of the first pin 6, and a negative pole of the converter R6 is connected to a negative pole of the first pin 363 through the resistor C6, the 3 rd pin of the converter is also grounded through the resistor R42, the anode of the D3 is connected with the transmitting coil through a resistor R41, the cathode of the D3 is grounded through a capacitor C44, one end of the resistor R43 is connected with the cathode of the D3, and the other end of the resistor R43 is grounded; the 1 st stitch and the 2 nd stitch of converter all are connected with the one end of resistance R45, the other end of resistance R45 with the 6 th stitch of converter is connected, the 6 th stitch of converter still passes through electric capacity C46 ground connection, the 5 th stitch of converter with the one end of resistance R51 is connected, the other end of resistance R51 passes through electric capacity C49 ground connection, be connected through resistance R50 between the 5 th stitch and the 7 th stitch of converter, the 7 th stitch of converter still is connected with the one end of resistance R47, the other end of resistance R47 is connected with electric capacity C47, resistance R46, the one end of resistance R48 respectively, the other end ground connection of electric capacity C47, the other end of resistance R46 and resistance R48 respectively with the 10 th and the 9 th stitch of converter, the 9 th stitch of converter still passes through electric capacity C48 ground connection, connect through resistance R44 between the 10 th stitch and the 8 th stitch of converter, the 8 th pin of the converter is connected with the 19 th pin of the main controller MCU, and the 8 th pin of the converter is grounded through a resistor R49.

3. The wireless charging circuit of claim 1, wherein the BUCK voltage-reducing power supply circuit comprises an integrated circuit U1, a resistor R3, a resistor R4 and a resistor R5, a 5 th pin of the integrated circuit U1 is connected with a power supply voltage input terminal, a 5 th pin of the integrated circuit U1 is further grounded through a capacitor C9 and a capacitor C10, a 5 th pin and a 4 th pin of the integrated circuit U1 are connected through the resistor R3, a 2 nd pin of the integrated circuit U1 is grounded, a1 st pin and a 6 th pin of the integrated circuit U1 are connected through a capacitor C1, a 6 th pin of the integrated circuit U1 is further connected with a1 st terminal of L1, a 2 nd terminal of the L1 is connected with a 5V power supply, a 2 nd terminal of the L1 is further connected with one end of a resistor R4, the other end of the resistor R4 is connected with a 3 rd pin of the integrated circuit U5, and the resistor R4 is connected with a capacitor R57324 in parallel, the other end of the resistor R4 is also grounded through a resistor R5, and the 2 nd end of the L1 is also grounded through a capacitor C12 and a capacitor C13, respectively.

4. The wireless charging circuit of claim 1, wherein the power access circuit comprises a socket J1, an L2, an L3, a capacitor C17, a capacitor C18 and a capacitor C19, one end of the L2 is connected to the 1 st pin of the socket J1, the 1 st pin of the socket J1 is connected to the 3 rd pin of the socket J1 through the capacitor C17, the other end of the L2 is grounded through the capacitor C19 and the capacitor C18, the 3 rd pin of the socket J1 is grounded through the L3, and the other end of the L2 is further connected to a power voltage input terminal.

5. The wireless charging circuit of claim 1, wherein the input voltage detection circuit comprises a resistor R37, a resistor R38, and a capacitor C40, one end of the resistor R37 is connected to a power supply voltage input terminal, the other end of the resistor R37 is further connected to ground via the resistor R38 and the resistor C40, respectively, and the other end of the resistor R37 is further connected to the 2 nd pin of the main controller MCU.

6. The wireless charging circuit of claim 1, wherein the status indication circuit comprises an integrated circuit U5, a 19 th pin of the integrated circuit U5 is connected to a 12 th pin of the master controller MCU, a 19 th pin of the integrated circuit U5 is further connected to an 18 th pin of the integrated circuit U5 through a resistor R32, a 20 th pin of the integrated circuit U5 is connected to an 18 th pin of the integrated circuit U5 through a resistor R31, an 18 th pin of the integrated circuit U5 is connected to a 5V power supply, a1 st pin of the integrated circuit U5 is connected to a 2 nd pin, a 2 nd pin of the integrated circuit U5 is connected to a 3 rd pin, a1 st pin and a 4 th pin of the integrated circuit U5 are connected to a pin C36, a 3 rd pin of the integrated circuit U5 is connected to a 17 th pin, a 17 th pin of the integrated circuit U5 is connected to a 21 th pin, the 4 th pin and the 18 th pin of the integrated circuit U5 are connected through a resistor R36, the 21 st pin of the integrated circuit U5 is grounded, the 9 th pin of the integrated circuit U5 is grounded after being connected in series with a resistor R23 and an LED8, the 10 th pin of the integrated circuit U5 is grounded after being connected in series with a resistor R24 and an LED7, the 11 th pin of the integrated circuit U5 is grounded after being connected in series with a resistor R25 and an LED6, the 12 th pin of the integrated circuit U5 is grounded after being connected in series with a resistor R27 and an LED5, the 13 th pin of the integrated circuit U5 is grounded after being connected in series with a resistor R29 and an LED4, the 14 th pin of the integrated circuit U5 is grounded after being connected in series with a resistor R5 and an LED5, the 15 th pin of the integrated circuit U5 is grounded after being connected in series with a resistor R5 and an LED5, and a pin 16 th pin of the integrated circuit U5 is grounded.