Wireless power transmission device with load data feedback and transmission method thereof

Abstract

The invention belongs to the technical field of wireless data and energy simultaneous transmission modulation, and particularly relates to a wireless power transmission device with load data feedback and a transmission method thereof, comprising a control circuit, a driving circuit, a main circuit, a feedback detection circuit and a receiving circuit. The control circuit generates a PWM pulse to modulate the switching device. The driving circuit amplifies the PWM pulse. The main circuit is driven by a half bridge, direct-current voltage is converted into high-frequency alternating-current voltage, electrical isolation and fault protection are achieved, and the transmitting coil is connected with the output end of the inverter. And the feedback detection circuit identifies secondary side information by detecting the current change of the primary side coil. A receiving coil of the receiving circuit is connected with a load after being rectified, a carrier signal is coupled to an electric energy channel through a capacitor, single-coil transmission with load data feedback and electric energy is achieved, and cost is reduced while safety of energy transmission is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless digital energy transmission modulation, and in particular relates to a wireless power transmission device with load data feedback and a transmission method thereof. Background Art

[0002] With the development of science and technology, the popularity of portable electronic devices has put forward new requirements for power supply and promoted the development of wireless power transmission (WPT) technology. WPT technology realizes wireless transmission of power through electromagnetic induction, which improves the usability and safety of equipment. In the WPT system, the energy transmitter converts electrical energy into high-frequency alternating current to generate a magnetic field, while the energy receiver captures the magnetic field energy and converts it into electrical energy. In order to improve the efficiency and stability of the system, researchers are exploring how to achieve wireless communication between the primary and secondary coils without adding additional transmission channels to monitor and adjust system performance while transmitting energy and information.

[0003] At present, the research areas of wireless digital energy transmission technology generally include system topology design, compensation network configuration, coil winding technology, coil spacing and system impedance matching. Although the theoretical basis of this technology is relatively complete and has been verified by corresponding experiments, the demand analysis and discussion on fast and small-size feedback control of data conversion at the receiving end is relatively insufficient. At the same time, there are still challenges in data and energy transmission range and cost control. Most studies focus on the analysis and design of coils and compensation networks, focusing on the data and energy transmission principles and efficiency. Therefore, the present invention has carried out a detailed design of a wireless power transmission system with load data feedback. Summary of the invention

[0004] The present invention aims to solve the limitations of the prior art and provide a wireless power transmission device with load data feedback and a transmission method thereof. The system does not require bulky and expensive hardware, such as FPGA or a separate RF communication module, and can achieve the safety of energy transmission at low cost and perform fast and small-size feedback control on the data conversion at the receiving end. Through innovative technical solutions, the present invention is expected to promote the application of wireless power supply technology in a wider range of fields.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] A wireless power transmission device with load data feedback, comprising a control circuit, a drive circuit, a main circuit, a feedback detection circuit, and a receiving circuit;

[0007] The control circuit generates PWM pulses to modulate the switching device;

[0008] The driving circuit amplifies the PWM pulse;

[0009] The main circuit adopts half-bridge drive to convert DC voltage into high-frequency AC voltage and realize electrical isolation and fault protection. The transmitting coil is connected to the output end of the inverter;

[0010] The feedback detection circuit detects the change of the primary coil current to identify the secondary side information;

[0011] The receiving coil of the receiving circuit is connected to the load after rectification, and the carrier signal is coupled to the power channel through capacitance, thereby realizing single-coil transmission with load data feedback and power.

[0012] The control circuit includes a first isolated power supply, a first fuse, a first crystal oscillator, a second crystal oscillator, a first diode, a second diode, a first voltage stabilizer, a second voltage stabilizer, a first single-chip microcomputer, a first USB to serial port chip, first to fourteenth capacitors, and a first resistor.

[0013] The first crystal oscillator and the second crystal oscillator are passive crystal oscillators, and the first diode is a Schottky diode.

[0014] The positive pole of the 24V power supply is connected to the positive input terminal of the first isolated power supply through the first fuse and the first diode, and the negative pole of the 24V power supply is grounded; the negative input terminal of the first isolated power supply is grounded, and the output terminal of the first isolated power supply is connected to the input terminal of the first voltage regulator on the one hand, and is grounded to the negative pole of the output voltage through the parallel branch formed by the first capacitor and the second capacitor on the other hand. The output terminal of the first voltage regulator is connected to the input terminal of the second voltage regulator on the one hand through the second diode, and is grounded on the other hand through the third capacitor; the input terminal of the second voltage regulator is grounded to the common terminal through the fourth capacitor, and the output terminal of the second voltage regulator is grounded through the fifth capacitor.

[0015] The external crystal oscillator input pin and output pin of the first single-chip microcomputer are respectively connected to the frequency input pin and frequency output pin of the first crystal oscillator, the serial communication sending pin of the first single-chip microcomputer is connected to the serial communication receiving pin of the first USB to serial port chip, the serial communication receiving pin of the first single-chip microcomputer is connected to the serial communication sending pin of the first USB to serial port chip, the analog reference voltage pin of the first single-chip microcomputer is grounded through the eighth capacitor, the reset pin of the first single-chip microcomputer is connected to the 3.3V power supply terminal through the first resistor on the one hand, and is connected to the control signal pin of the first USB to serial port chip U5 through the twelfth capacitor on the other hand; the input end of the first single-chip microcomputer is connected to the 3.3V power supply terminal on the one hand, and is grounded through the seventh capacitor and the tenth capacitor C10 on the other hand, and the 3.3V power supply pin is grounded through the eleventh capacitor C11; the two crystal oscillator pins of the first USB to serial port chip are connected to the two ends of the second crystal oscillator, and are grounded through the thirteenth capacitor and the fourteenth capacitor respectively; the 5V power supply voltage is connected to the input end of the first USB to serial port chip on the one hand, and is grounded through the parallel branch formed by the sixth capacitor and the ninth capacitor on the other hand; the common end of the first USB to serial port chip is grounded.

[0016] The driving circuit includes a first inverter, a first optocoupler, a second optocoupler, a first gate driver, a third diode, a fourth diode, a first triode, fifteenth to eighteenth capacitors, and second to twelfth resistors.

[0017] The first inverter is a Schmitt inverter; the twenty-third capacitor is a bootstrap capacitor.

[0018] The PB0 interface of the first single-chip computer is connected to the input end of the first inverter, the input end of the first inverter is connected to the anode of the input end of the first optocoupler through the second resistor, the output end of the first inverter is connected to the anode of the input end of the second optocoupler through the third resistor, the power supply end of the first inverter is connected to the 3.3V power supply end, and the common end is grounded; the cathode of the input end of the light-emitting diode of the first optocoupler is grounded, the power supply end of the first optocoupler is connected to the 12V power supply end, the output terminal of the first optocoupler is internally connected to another output terminal, on the one hand, it is connected to the logic low-end input pin of the first gate driver through the eighth resistor to provide a driving signal, on the other hand, it is grounded through the ninth resistor, and the common end of the first optocoupler is grounded; the cathode of the input end of the light-emitting diode of the second optocoupler is grounded, the power supply end of the second optocoupler is connected to the 12V power supply end, the output terminal of the second optocoupler is internally connected to another output terminal, on the one hand, it is connected to the logic high-end input pin of the first gate driver through the fifth resistor to provide a driving signal, on the other hand, it is grounded through the seventh resistor, and the common end of the second optocoupler is grounded;

[0019] The power supply end of the first gate driver is connected to the power supply end on the one hand, and is grounded through a parallel branch formed by the fifteenth capacitor and the sixteenth capacitor connected in parallel on the other hand; the logic high-end input of the first gate driver receives the high-end side drive signal of the second optocoupler, the logic low-end input of the first gate driver receives the low-end side drive signal of the first optocoupler, the shutdown pin of the first gate driver is connected to the collector of the first transistor, the high-side output pin of the first gate driver is connected to one side of the fourth resistor, the low-side output pin of the first gate driver is connected to one side of the tenth resistor, the low-side fixed power supply voltage of the first gate driver is connected to the 12V power supply end on the one hand, and is grounded through the ninth capacitor on the other hand, the floating power supply offset voltage of the high-end drive of the first gate driver is provided by the 12V power supply voltage through the first diode, the high-end floating power supply voltage of the first gate driver is connected to the high-end floating power supply offset voltage through the eighth capacitor C8, and the common end of the first gate driver is grounded.

[0020] The collector of the first transistor is connected to the shutdown pin of the first gate driver on the one hand, and is connected to the 12V power supply voltage through the sixth resistor on the other hand, and is grounded through a branch formed by the fifteenth capacitor and the sixteenth capacitor connected in parallel. The IO port is connected to the base of the first transistor through the fourth diode and the eleventh resistor on the one hand, and is connected to the power ground through the twelfth resistor and the emitter of the first transistor on the other hand.

[0021] The main circuit includes a transmitting coil, a first field effect transistor, a second field effect transistor, a first inductor, a first DCDC converter, a first transistor, nineteenth to twenty-fifth capacitors, and thirteenth to fifteenth resistors;

[0022] The 24V power supply voltage is connected to the input end of the first DCDC converter through the first inductor on the one hand, and is grounded through the capacitor and the common end of the first DCDC converter on the other hand; the output anode of the first DCDC converter is grounded through the thirteenth resistor on the one hand, and through the branch formed by the twentieth capacitor and the twenty-first capacitor in parallel on the other hand. The other end of the thirteenth resistor is grounded through the branch formed by the twenty-second capacitor and the twenty-third capacitor in parallel on the one hand, and is connected to the drain of the first field effect tube on the other hand.

[0023] The 80V power supply voltage is connected to the ground through the thirteenth resistor and the parallel branch formed by the twenty-second and twenty-third capacitors, and is connected to the drain of the first field effect tube on the other hand, and is connected to one end of the transmitting coil through the twenty-fourth capacitor. The source of the first field effect tube is connected to the other end of the transmitting coil on the one hand, and is connected to the drain of the second field effect tube on the other hand; the drain of the second field effect tube is connected to one end of the transmitting coil, and the source is connected to the power ground on the one hand, and is connected to the other end of the transmitting coil through the twenty-fifth capacitor on the other hand.

[0024] The feedback detection circuit includes a first operational amplifier, a first voltage comparator, a fifth diode, twenty-sixth to thirtieth capacitors, and sixteenth to twenty-fifth resistors.

[0025] The sixteenth resistor, the nineteenth resistor, the twentieth resistor and the twenty-second resistor are adjustable resistors.

[0026] One end of the transmitting coil connected to the twenty-fourth capacitor and the twenty-fifth capacitor is grounded through the twenty-third resistor on the one hand, and is connected to one end of the twenty-second resistor through a parallel branch formed by the fifth diode, the twenty-fourth resistor, the twenty-fifth resistor, the twenty-ninth capacitor, and the thirtieth capacitor on the other hand; the middle tap end of the twenty-second resistor is connected to the non-inverting input end of the first voltage comparator, and the other end of the twenty-second resistor is grounded; the inverting input end of the first operational amplifier is connected to the middle tap of the sixteenth resistor; one end of the fixed end of the sixteenth resistor is connected to the power supply, and the other end is connected to the output end of the first operational amplifier through the eighteenth resistor; the positive power supply end of the first voltage comparator is connected to the power supply; the common end of the first operational amplifier is grounded, and the output end of the first operational amplifier is grounded through the seventeenth resistor and the twenty-sixth capacitor.

[0027] The PD5 pin of the first single-chip computer is connected to the middle tap of the 19th resistor. One end of the fixed end of the 19th resistor is connected to the 12V power supply through the 21st resistor, and the other end is connected to the output pin of the first voltage comparator. The inverting input end of the first voltage comparator is connected to the middle tap of the 24th resistor, and the two ends of the 24th resistor are respectively connected to the 12V power supply and the ground. The positive power supply end of the first voltage comparator is connected to the 12V power supply. The common end of the first voltage comparator is grounded. The 12V power supply is grounded through the branch formed by the parallel connection of the 23rd capacitor and the 24th capacitor.

[0028] The receiving circuit includes a secondary coil, a third field effect transistor, a first thyristor, a third crystal oscillator, a second single chip computer, a second inverter, sixth to fourteenth diodes, thirty-first to forty-second capacitors, and twenty-sixth to thirty-second resistors.

[0029] The twelfth diode is an electrostatic protection diode.

[0030] The front end of the secondary coil passes through the 31st capacitor, and the rear end passes through the 38th capacitor. The rectifier bridge formed by four diodes converts the AC into DC, and then passes through the 32nd capacitor, the 33rd capacitor, and the 27th resistor to connect to the load. On the other hand, the rear end of the secondary coil is connected to the source of the third field effect tube through the 39th capacitor; the gate of the third field effect tube is connected to the PD5 interface of the second single chip computer through the 28th resistor; on the other hand, it is connected to the drain of the third field effect tube through the 29th resistor.

[0031] The external crystal oscillator input pin and output pin of the second single-chip microcomputer are connected to the frequency input pin and frequency output pin of the third crystal oscillator respectively, the analog reference voltage pin of the second single-chip microcomputer is grounded through the thirty-fourth capacitor, the reset pin of the first single-chip microcomputer is connected to the 3.3V power supply terminal through the twenty-sixth resistor on the one hand, and is connected to the RTS pin of the burning port through the thirty-seventh capacitor on the other hand; the input terminal of the second single-chip microcomputer is connected to the 3.3V power supply terminal on the one hand, and is grounded to the common terminal of the second single-chip microcomputer through the parallel branch composed of the thirty-fifth capacitor and the thirty-sixth capacitor on the other hand;

[0032] After the AC voltage of the secondary coil is converted into DC, the positive voltage passes through the 30th resistor and the 10th diode, and then passes through the 12th diode and the 40th capacitor to form a parallel branch to output a 3.3V voltage at the positive end to power the microcontroller, and the negative end is grounded.

[0033] The PD4 end of the second inverter is connected to the gate of the first thyristor through the eleventh diode on one hand, and is grounded through the forty-first capacitor on the other hand; the positive pole of the secondary coil after converting DC is connected to the source of the first thyristor; the drain of the first thyristor is grounded through the thirty-first resistor.

[0034] The wireless power transmission method with load data feedback is implemented by the following steps:

[0035] The energy transfer process of electromagnetic induction is as follows:

[0036] The front-stage circuit of the system divides the 24V power input into two paths, one path increases the voltage through the boost circuit, and quickly charges the 20th capacitor and the 21st capacitor through the 13th resistor; the other path generates a pair of complementary PWM waves through the first single-chip microcomputer output PWM wave and the first inverter, respectively connected to the input ends of the first optocoupler and the second optocoupler to achieve electrical isolation between the control circuit and the drive circuit, and the output end is respectively connected to the LIN end and the HIN end of the first gate driver through the fifth resistor and the eighth resistor; the switch of the first field effect tube and the first field effect tube is controlled by a complementary pulse width modulation signal; the first single-chip microcomputer IO port triggers the first transistor to turn on through the fourth diode and the eleventh resistor to send a high-level signal to the SD end of the first gate driver, triggering the first gate driver to turn on, so that the charged electrolytic capacitor is quickly discharged, driving the half-bridge inverter to generate high-frequency alternating current, and then exciting the transmitting coil. The transmitting coil and the receiving coil are coaxially opposed and completely symmetrically arranged. The transmitting coil transmits high-frequency alternating current power to the receiving coil through magnetic coupling resonance to power the load, realizing wireless transmission of power.

[0037] The load data feedback process of electromagnetic induction is as follows:

[0038] The PD5 port of the second single-chip microcomputer of the receiving circuit is connected to the gate of the third field effect tube through the twenty-eighth resistor, and the current between the source and the drain is controlled by controlling the gate voltage of the third field effect tube, so as to achieve the function of controlling the on-off, and the carrier signal with data information is coupled with the electric energy channel through the thirty-ninth capacitor. The capacitor has a low impedance to the high-frequency carrier signal and a high impedance to the low-frequency electric energy signal.

[0039] The coupling circuit filters out the high-frequency data signal through the ninth diode of the primary coil, the external resistor and capacitor, and the active filter constructed by the first voltage comparator. The first voltage comparator will judge the input signal according to its threshold voltage, and output a corresponding high or low level signal, and transmit the signal to the first single-chip microcomputer to realize the load data feedback process.

[0040] Based on the above process, compared with the traditional magnetic coupling resonant wireless power transmission device, the wireless power transmission device with load data feedback of the present invention first uses an optical coupler to control the driving signal to discharge the high-voltage capacitor to the primary coil, and at the same time adds a real-time transmission feedback data signal function, thereby having the following advantages:

[0041] First, compared with the traditional magnetic coupling resonant wireless power transmission device, the present invention achieves electrical isolation through the optical coupling control driving circuit, significantly enhancing the anti-interference ability of the system and ensuring the stability and reliability of signal transmission. It not only improves the safety of the system, but also improves the durability and maintenance convenience of the equipment through high-speed response and long life characteristics. In addition, the high isolation voltage and low noise performance of the optical coupler further ensure the accurate transmission of the signal, making it an ideal choice for maintaining efficient operation in complex electromagnetic environments.

[0042] Secondly, compared with the traditional magnetic coupling resonant wireless power transmission device, the present invention can achieve higher energy transmission efficiency by using a small planar coil transmission system, and has the characteristics of fast response and high reliability, so that it can be used in compact space conditions. On the other hand, it realizes the feedback of receiving end load data through simple design, which has obvious advantages in applications under dynamic load conditions.

[0043] The present invention has a reasonable structure and ingenious design, and effectively solves the problems of traditional magnetic coupling resonant wireless power transmission devices that cannot be miniaturized, have poor economic efficiency, and cannot perform load data feedback. It can achieve the safety of energy transmission at low cost and perform fast, small-size feedback control on data conversion at the receiving end. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the control circuit in the present invention.

[0045] Figure 2It is a schematic diagram of the driving circuit in the present invention.

[0046] Figure 3 It is a schematic diagram of the main circuit in the present invention.

[0047] Figure 4 It is a schematic diagram of the feedback detection circuit in the present invention.

[0048] Figure 5 It is a schematic diagram of the receiving circuit in the present invention. DETAILED DESCRIPTION

[0049] A wireless power transmission device with load data feedback includes a control circuit, a drive circuit, a main circuit, a feedback detection circuit, and a receiving circuit; the control circuit generates a PWM pulse modulation switch device; the drive circuit amplifies the PWM pulse; the main circuit adopts a half-bridge drive to convert a DC voltage into a high-frequency AC voltage and realize electrical isolation and fault protection, and the transmitting coil is connected to the output end of the inverter; the feedback detection circuit detects the change of the primary coil current to identify the secondary side information; the receiving coil of the receiving circuit is connected to the load after rectification, and the carrier signal is coupled to the electric energy channel through capacitance, so as to realize single-coil transmission with load data feedback and electric energy.

[0050] like Figure 1 As shown, the control circuit includes a first isolated power supply U1, a first fuse F1, a first crystal oscillator Y1, a second crystal oscillator Y2, a first diode D1, a second diode D2, a first voltage stabilizer U2, a second voltage stabilizer U3, a first single-chip microcomputer U4, a first USB to serial port chip U5, first to fourteenth capacitors C1~C14, and a first resistor R1.

[0051] The first crystal oscillator and the second crystal oscillator are passive crystal oscillators, and the first diode is a Schottky diode.

[0052] The positive electrode of the 24V power supply terminal is connected to the positive input terminal of the first isolated power supply U1 through the first fuse F1 and the first diode D1, and the negative electrode of the 24V power supply terminal is grounded; the negative input terminal of the first isolated power supply U1 is grounded, and the output terminal of the first isolated power supply U1 is connected to the input terminal of the first voltage regulator U2 on the one hand, and is grounded to the negative electrode of the output voltage through the parallel branch formed by the first capacitor C1 and the second capacitor C2 on the other hand. The output terminal of the first voltage regulator U2 is connected to the input terminal of the second voltage regulator U3 on the one hand through the second diode D2, and is grounded through the third capacitor C3 on the other hand; the input terminal of the second voltage regulator U3 is grounded to the common terminal through the fourth capacitor C4, and the output terminal of the second voltage regulator U3 is grounded through the fifth capacitor C5.

[0053] The external crystal oscillator input pin and output pin of the first single-chip microcomputer U4 are connected to the frequency input pin and frequency output pin of the first crystal oscillator Y1 respectively, the serial communication sending pin of the first single-chip microcomputer U4 is connected to the serial communication receiving pin of the first USB to serial port chip U5, the serial communication receiving pin of the first single-chip microcomputer U4 is connected to the serial communication sending pin of the first USB to serial port chip U5, the analog reference voltage pin of the first single-chip microcomputer U4 is grounded through the eighth capacitor C8, the reset pin of the first single-chip microcomputer U4 is connected to the 3.3V power supply terminal through the first resistor R1 on the one hand, and to the first USB through the twelfth capacitor C12 on the other hand. The control signal pin of the B-to-serial port chip U5 is connected; the input end of the first single-chip computer U4 is connected to the 3.3V power supply end on the one hand, and is grounded through the seventh capacitor C7 and the tenth capacitor C10 on the other hand, and the 3.3V power supply pin is grounded through the eleventh capacitor C11; the two crystal oscillator pins of the first USB-to-serial port chip U5 are connected to the two ends of the second crystal oscillator Y2, and are grounded through the thirteenth capacitor C13 and the fourteenth capacitor C14 respectively; the 5V power supply voltage is connected to the input end of the first USB-to-serial port chip U5 on the one hand, and is grounded through the parallel branch formed by the sixth capacitor C6 and the ninth capacitor C9 on the other hand; the common end of the first USB-to-serial port chip U5 is grounded.

[0054] like Figure 2 As shown, the driving circuit includes a first inverter U6, a first optocoupler U7, a second optocoupler U8, a first gate driver U9, a third diode D3, a fourth diode D4, a first transistor Q1, fifteenth to eighteenth capacitors C15-C18, and second to twelfth resistors R2-R12.

[0055] The first inverter is a Schmitt inverter; the twenty-third capacitor is a bootstrap capacitor.

[0056] The PB0 interface of the first single-chip computer U4 is connected to the input end of the first inverter U6, the input end of the first inverter U6 is connected to the anode of the input end of the first optical coupler U7 through the second resistor R2, the output end of the first inverter U6 is connected to the anode of the input end of the second optical coupler U8 through the third resistor R3, the power supply end of the first inverter U6 is connected to the 3.3V power supply end, and the common end is grounded; the cathode of the input end of the light-emitting diode of the first optical coupler U7 is grounded, the power supply end of the first optical coupler U7 is connected to the 12V power supply end, and the output terminal of the first optical coupler U7 is internally connected to another output terminal. The eighth resistor R8 is connected to the logic low-end input pin of the first gate driver U9 to provide a driving signal, and the ninth resistor R9 is grounded on the other hand, and the common end of the first optocoupler U7 is grounded; the cathode of the input end of the light-emitting diode of the second optocoupler U8 is grounded, the power supply end of the second optocoupler U8 is connected to the 12V power supply end, and the output terminal of the second optocoupler U8 is internally connected to another output terminal, and the fifth resistor R5 is connected to the logic high-end input pin of the first gate driver U9 to provide a driving signal, and the seventh resistor R7 is grounded on the other hand, and the common end of the second optocoupler U8 is grounded;

[0057] The power supply end of the first gate driver U9 is connected to the 12V power supply end on the one hand, and is grounded through a parallel branch formed by the fifteenth capacitor R15 and the sixteenth capacitor R16 connected in parallel on the other hand; the logic high-end input of the first gate driver U9 receives the high-end side drive signal of the second optocoupler U8, and the logic low-end input of the first gate driver U9 receives the low-end side drive signal of the first optocoupler U7. The shutdown pin of the first gate driver U9 is connected to the collector of the first transistor Q1, the high-side output pin of the first gate driver U9 is connected to one side of the fourth resistor R4, and the low-side output pin of the first gate driver U9 is connected to one side of the tenth resistor R10. The low-side fixed power supply voltage of the first gate driver U9 is connected to the 12V power supply end on the one hand, and is grounded through the ninth capacitor on the other hand. The floating power supply offset voltage of the high-end drive of the first gate driver U9 is provided by the 12V power supply voltage through the first diode, the high-end floating power supply voltage of the first gate driver U9 is connected to the high-end floating power supply offset voltage through the eighth capacitor C8, and the common end of the first gate driver U9 is grounded.

[0058] The collector of the first transistor Q1 is connected to the shutdown pin of the first gate driver U9 on the one hand, and is connected to the 12V power supply voltage through the sixth resistor R6 on the other hand, and is grounded through a branch formed by the parallel connection of the fifteenth capacitor C15 and the sixteenth capacitor C16. The IO port is connected to the base of the first transistor Q1 through the fourth diode D4 and the eleventh resistor R11 on the one hand, and is connected to the power ground through the twelfth resistor R12 and the emitter of the first transistor Q1 on the other hand.

[0059] like Figure 3As shown, the main circuit includes a transmitting coil J1, a first field effect transistor Q2, a second field effect transistor Q3, a first inductor L1, a first DCDC converter U10, a first transistor Q1, nineteenth to twenty-fifth capacitors C21-C25, and thirteenth to fifteenth resistors R13-R15;

[0060] The 24V power supply voltage is connected to the input end of the first DCDC converter U10 through the first inductor L1 on the one hand, and is grounded through the capacitor C19 and the common end of the first DCDC converter U10 on the other hand; the output end anode of the first DCDC converter U10 is grounded through the thirteenth resistor R13 on the one hand, and through the branch formed by the twentieth capacitor C20 and the twenty-first capacitor C21 in parallel on the other hand. The other end of the thirteenth resistor R13 is grounded through the branch formed by the twenty-second capacitor C22 and the twenty-third capacitor C23 in parallel on the one hand, and is connected to the drain of the first field effect transistor Q2 on the other hand.

[0061] The 80V power supply voltage is connected to the ground through the thirteenth resistor R13 and the parallel branch formed by the twenty-second capacitor C22 and the twenty-third capacitor C23, and is connected to the drain of the first field effect transistor Q2 on the other hand, and is connected to one end of the transmitting coil J1 through the twenty-fourth capacitor C24. The source of the first field effect transistor Q2 is connected to the other end of the transmitting coil J1 on the one hand, and is connected to the drain of the second field effect transistor Q3 on the other hand; the drain of the second field effect transistor Q3 is connected to one end of the transmitting coil J1, and the source is connected to the power ground on the one hand, and is connected to the other end of the transmitting coil J1 through the twenty-fifth capacitor C25 on the other hand.

[0062] like Figure 4 As shown, the feedback detection circuit includes a first operational amplifier U11, a first voltage comparator U12, a fifth diode D5, twenty-sixth to thirtieth capacitors C26-C30, and sixteenth to twenty-fifth resistors R16-R25.

[0063] The sixteenth resistor, the nineteenth resistor, the twentieth resistor and the twenty-second resistor are adjustable resistors.

[0064] The transmitting coil J1 is connected to the 24th capacitor C24 and the 25th capacitor C25, one end of which is grounded through the 23rd resistor R23, and the other end of which is connected to one end of the 22nd resistor R22 through the parallel branch formed by the fifth diode D5, the 24th resistor R24, the 25th resistor R25, the 29th capacitor C29 and the 30th capacitor C30; the middle tap end of the 22nd resistor R22 is connected to the non-inverting input end of the first voltage comparator U12, and the other end of the 22nd resistor R22 is grounded; the inverting input end of the first operational amplifier U11 is connected to the middle tap of the 16th resistor R16; one end of the fixed end of the 16th resistor R16 is connected to the 12V power supply, and the other end is connected to the output end of the first operational amplifier U11 through the 18th resistor R18; the positive power supply end of the first voltage comparator U12 is connected to the 12V power supply; the common end of the first operational amplifier U11 is grounded, and the output end of the first operational amplifier U11 is grounded through the 17th resistor R17 and the 26th capacitor C26.

[0065] The PD5 pin of the first single-chip computer U4 is connected to the middle tap end of the nineteenth resistor R19. One end of the fixed end of the nineteenth resistor is connected to the 12V power supply through the twenty-first resistor R21, and the other end is connected to the output pin of the first voltage comparator U12; the inverting input end of the first voltage comparator U12 is connected to the middle tap of the twenty-fourth resistor R24, and the two ends of the twenty-fourth resistor R24 ​​are respectively connected to the 12V power supply and the ground; the positive power supply end of the first voltage comparator U12 is connected to the 12V power supply; the common end of the first voltage comparator U12 is grounded. The 12V power supply is grounded through the branch formed by the twenty-third capacitor C23 and the twenty-fourth capacitor C24 connected in parallel.

[0066] like Figure 5 As shown, the receiving circuit includes a secondary coil J2, a third field effect transistor Q4, a first thyristor Q5, a third crystal oscillator Y3, a second single-chip computer U13, a second inverter U14, sixth to fourteenth diodes D6~D14, thirty-first to forty-second capacitors C31~C42, and twenty-sixth to thirty-second resistors R26~R32.

[0067] The twelfth diode is an electrostatic protection diode.

[0068] The front end of the secondary coil J2 passes through the 31st capacitor C31, and the rear end passes through the 38th capacitor C38. The rectifier bridge formed by four diodes D6-D9 converts the AC into DC, and then passes through the 32nd capacitor C32, the 33rd capacitor C33, and the 27th resistor R27 to connect to the load. On the other hand, the rear end of the secondary coil J2 is connected to the source of the third field effect transistor Q4 through the 39th capacitor C39; the gate of the third field effect transistor Q4 is connected to the PD5 interface of the second single-chip computer U13 through the 28th resistor R28; on the other hand, it is connected to the drain of the third field effect transistor Q4 through the 29th resistor R29.

[0069] The external crystal oscillator input pin and output pin of the second single-chip microcomputer U13 are connected to the frequency input pin and frequency output pin of the third crystal oscillator Y3 respectively, the analog reference voltage pin of the second single-chip microcomputer U13 is grounded through the thirty-fourth capacitor C34, the reset pin of the first single-chip microcomputer U4 is connected to the 3.3V power supply terminal through the twenty-sixth resistor R26 on the one hand, and is connected to the RTS pin of the burning port through the thirty-seventh capacitor C37 on the other hand; the input terminal of the second single-chip microcomputer U13 is connected to the 3.3V power supply terminal on the one hand, and is grounded to the common terminal of the second single-chip microcomputer U13 through the parallel branch composed of the thirty-fifth capacitor C35 and the thirty-sixth capacitor C36 on the other hand;

[0070] The positive voltage after the AC voltage of the secondary coil J2 is converted into DC passes through the 30th resistor R30 and the 10th diode D10, and then passes through the 12th diode D12 and the 40th capacitor C40 to form a parallel branch to output a 3.3V voltage at the positive end to power the single-chip computer, and the negative end is grounded. The head end of the secondary coil J2 is connected to the input end of the second inverter U14 after being clamped by the 32nd resistor R32, the 13th diode D13 and the 14th diode D14. The 3.3V power supply passes through the positive power supply of the second inverter U14 on the one hand, and passes through the 42nd capacitor C42 on the other hand to ground. The output end of the second inverter U14 is connected to the PD6 end of the second single-chip computer U13, and the common end of the second inverter U14 is grounded.

[0071] The PD4 end of the second inverter U14 is connected to the gate of the first thyristor Q5 through the eleventh diode D11 on one hand, and is grounded through the forty-first capacitor on the other hand; the positive pole of the secondary coil after converting DC is connected to the source of the first thyristor Q5; the drain of the first thyristor Q5 is grounded through the thirty-first resistor R31.

[0072] The first transistor Q1 is an S8050 transistor; the first field effect transistor Q2 and the second field effect transistor Q3 are IRF740 field effect transistors; the third field effect transistor Q4 is an AO3400A0 field effect transistor; the first diode to the eleventh diode D1-D11 are all SS14 diodes; the twelfth diode D12 is an ESD electrostatic protection diode; the first crystal oscillator Y1 is a 12Mhz crystal oscillator; the second crystal oscillator Y2 and the third crystal oscillator Y3 are 16Mhz crystal oscillators;

[0073] The capacitance of the capacitors C1, C4, C6, C8, C10, C12, C16, C23, C26, C29, C30, C31, C34, C35, C37, C38, C39, and C42 is 0.1 μF; the capacitance of the capacitors C2, C3, C17C40 is 1 μF; the capacitance of C5, C7, C9, C15, C18, and C36 is 10 μF; The capacitance of C27, C28, and C36 is 10 μF; the capacitance of the capacitors C11 and C41 is 0.01 μF; the capacitance of the capacitors C13 and C14 is 22 pF; the capacitance of the capacitor C19 is 47 μF; the capacitance of the capacitors C20 and C21 is 220 uF; the capacitance of the capacitors C22, C32, and C33 is 22 μF; the capacitance of the capacitors C24 and C25 is 47 nF;

[0074] The resistance values ​​of the resistors R1, R7, R9, R12, R14, R15, R19, R20, R21, R26, R29, and R32 are all 10KΩ; the resistance values ​​of the resistors R2 and R3 are all 1.5KΩ; the resistance values ​​of the resistors R4 and R10 are all 2.7Ω; the resistance values ​​of the resistors R5 and R8 are all 2.7Ω; the resistance values ​​of the resistors R6, R11, R23, R28, and R31 are all 1KΩ; the resistance of the resistor R13 is 150Ω; the resistance of the resistors R16 and R22 are both 100KΩ; the resistance of the resistor R17 is 500Ω; the resistance of the resistor R18 is 250Ω; the resistance of the resistors R24 and R25 are both 800Ω; the resistance of the resistor R27 is 10MΩ; the resistance of the resistor R30 is 82Ω; the inductance of the first inductor L1 is 2.2μH.

[0075] The first isolated power supply U1 is a TDK15-24S12 type DC-DC converter.

[0076] The first voltage stabilizer U2 is a 78M05 type voltage stabilizer.

[0077] The second voltage regulator U3 is a RS3007-3.3ASYF5 linear voltage regulator.

[0078] The linear voltage regulator N is a XC6701B502 linear voltage regulator.

[0079] The first single-chip microcomputer U4 and the second single-chip microcomputer U13 are both LGT8F88A_QFP32 type microcontrollers.

[0080] The first USB-to-serial port chip U5 is a CH340G USB-to-serial port chip.

[0081] The first inverter U6 is a SN74LVC1G14DBVR inverter.

[0082] The first optical coupler U7 and the second optical coupler U8 are TLP250 optical couplers.

[0083] The first gate driver U9 is an IR2110S gate driver.

[0084] The first DCDC converter U10 is a WRB2480MD-4W DCDC converter.

[0085] The first operational amplifier U11 is a LM358ADR_C404320 operational amplifier.

[0086] The first voltage comparator U12 is a LM393 voltage comparator.

[0087] The wireless power transmission method with load data feedback is implemented by the following steps:

[0088] The energy transfer process of electromagnetic induction is as follows:

[0089] The front-stage circuit of the system divides the 24V power input into two paths, one path increases the voltage through the boost circuit, and quickly charges the 20th capacitor and the 21st capacitor through the 13th resistor; the other path generates a pair of complementary PWM waves through the first single-chip microcomputer output PWM wave and the first inverter, respectively connected to the input ends of the first optocoupler and the second optocoupler to achieve electrical isolation between the control circuit and the drive circuit, and the output end is respectively connected to the LIN end and the HIN end of the first gate driver through the fifth resistor and the eighth resistor; the switch of the first field effect tube and the first field effect tube is controlled by a complementary pulse width modulation signal; the first single-chip microcomputer IO port triggers the first transistor to turn on through the fourth diode and the eleventh resistor to send a high-level signal to the SD end of the first gate driver, triggering the first gate driver to turn on, so that the charged electrolytic capacitor is quickly discharged, driving the half-bridge inverter to generate high-frequency alternating current, and then exciting the transmitting coil. The transmitting coil and the receiving coil are coaxially opposed and completely symmetrically arranged. The transmitting coil transmits high-frequency alternating current power to the receiving coil through magnetic coupling resonance to power the load, realizing wireless transmission of power.

[0090] The load data feedback process of electromagnetic induction is as follows:

[0091] The PD5 port of the second single-chip microcomputer of the receiving circuit is connected to the gate of the third field effect tube through the twenty-eighth resistor, and the current between the source and the drain is controlled by controlling the gate voltage of the third field effect tube, so as to achieve the function of controlling the on-off, and the carrier signal with data information is coupled with the electric energy channel through the thirty-ninth capacitor. The capacitor has a low impedance to the high-frequency carrier signal and a high impedance to the low-frequency electric energy signal.

[0092] The coupling circuit filters out the high-frequency data signal through the ninth diode of the primary coil, the external resistor and capacitor, and the active filter constructed by the first voltage comparator. The first voltage comparator will judge the input signal according to its threshold voltage, and output a corresponding high or low level signal, and transmit the signal to the first single-chip microcomputer to realize the load data feedback process.

Claims

1. A wireless power transmission device with load data feedback, characterized in that: It includes control circuit, drive circuit, main circuit, feedback detection circuit and receiving circuit; The control circuit generates PWM pulses to modulate the switching device; The driving circuit amplifies the PWM pulse; The main circuit adopts half-bridge drive to convert DC voltage into high-frequency AC voltage and realize electrical isolation and fault protection. The transmitting coil is connected to the output end of the inverter; The feedback detection circuit detects the change of the primary coil current to identify the secondary side information; The receiving coil of the receiving circuit is connected to the load after rectification, and the carrier signal is coupled to the power channel through capacitance, thereby realizing single-coil transmission with load data feedback and power.

2. A wireless power transmission device with load data feedback according to claim 1, characterized in that: The control circuit includes a first isolated power supply, a first fuse, a first crystal oscillator, a second crystal oscillator, a first diode, a second diode, a first voltage stabilizer, a second voltage stabilizer, a first single-chip microcomputer, a first USB to serial port chip, first to fourteenth capacitors, and a first resistor; The first crystal oscillator and the second crystal oscillator are passive crystal oscillators, and the first diode is a Schottky diode; The positive electrode of the 24V power supply terminal is connected to the positive input terminal of the first isolated power supply through the first fuse and the first diode, and the negative electrode of the 24V power supply terminal is grounded; the negative input terminal of the first isolated power supply is grounded, and the output terminal of the first isolated power supply is connected to the input terminal of the first voltage stabilizer on the one hand, and is grounded to the negative electrode of the output voltage through a parallel branch formed by the first capacitor and the second capacitor on the other hand; the output terminal of the first voltage stabilizer is connected to the input terminal of the second voltage stabilizer on the one hand through the second diode, and is grounded through the third capacitor on the other hand; the input terminal of the second voltage stabilizer is grounded to the common terminal through the fourth capacitor, and the output terminal of the second voltage stabilizer is grounded through the fifth capacitor; The external crystal oscillator input pin and output pin of the first single-chip microcomputer are respectively connected to the frequency input pin and frequency output pin of the first crystal oscillator, the serial communication sending pin of the first single-chip microcomputer is connected to the serial communication receiving pin of the first USB to serial port chip, the serial communication receiving pin of the first single-chip microcomputer is connected to the serial communication sending pin of the first USB to serial port chip, the analog reference voltage pin of the first single-chip microcomputer is grounded through the eighth capacitor, the reset pin of the first single-chip microcomputer is connected to the 3.3V power supply terminal through the first resistor on the one hand, and is connected to the control signal pin of the first USB to serial port chip U5 through the twelfth capacitor on the other hand; the input end of the first single-chip microcomputer is connected to the 3.3V power supply terminal on the one hand, and is grounded through the seventh capacitor and the tenth capacitor C10 on the other hand, and the 3.3V power supply pin is grounded through the eleventh capacitor C11; the two crystal oscillator pins of the first USB to serial port chip are connected to the two ends of the second crystal oscillator, and are grounded through the thirteenth capacitor and the fourteenth capacitor respectively; the 5V power supply voltage is connected to the input end of the first USB to serial port chip on the one hand, and is grounded through the parallel branch formed by the sixth capacitor and the ninth capacitor on the other hand; the common end of the first USB to serial port chip is grounded.

3. The wireless power transmission device with load data feedback according to claim 1, characterized in that: The driving circuit includes a first inverter, a first optocoupler, a second optocoupler, a first gate driver, a third diode, a fourth diode, a first triode, fifteenth to eighteenth capacitors, and second to twelfth resistors; The first inverter is a Schmitt inverter; the twenty-third capacitor is a bootstrap capacitor; The PB0 interface of the first single-chip computer is connected to the input end of the first inverter, the input end of the first inverter is connected to the anode of the input end of the first optocoupler through the second resistor, the output end of the first inverter is connected to the anode of the input end of the second optocoupler through the third resistor, the power supply end of the first inverter is connected to the 3.3V power supply end, and the common end is grounded; the cathode of the input end of the light-emitting diode of the first optocoupler is grounded, the power supply end of the first optocoupler is connected to the 12V power supply end, the output terminal of the first optocoupler is internally connected to another output terminal, on the one hand, it is connected to the logic low-end input pin of the first gate driver through the eighth resistor to provide a driving signal, on the other hand, it is grounded through the ninth resistor, and the common end of the first optocoupler is grounded; the cathode of the input end of the light-emitting diode of the second optocoupler is grounded, the power supply end of the second optocoupler is connected to the 12V power supply end, the output terminal of the second optocoupler is internally connected to another output terminal, on the one hand, it is connected to the logic high-end input pin of the first gate driver through the fifth resistor to provide a driving signal, on the other hand, it is grounded through the seventh resistor, and the common end of the second optocoupler is grounded; The power supply end of the first gate driver is connected to the power supply end on the one hand, and is grounded through a parallel branch formed by connecting the fifteenth capacitor and the sixteenth capacitor in parallel on the other hand; the logic high-end input of the first gate driver receives the high-end side drive signal of the second optocoupler, the logic low-end input of the first gate driver receives the low-end side drive signal of the first optocoupler, the shutdown pin of the first gate driver is connected to the collector of the first transistor, the high-side output pin of the first gate driver is connected to one side of the fourth resistor, the low-side output pin of the first gate driver is connected to one side of the tenth resistor, the low-side fixed power supply voltage of the first gate driver is connected to the 12V power supply end on the one hand, and is grounded through the ninth capacitor on the other hand, the floating power supply offset voltage of the high-end drive of the first gate driver is provided by the 12V power supply voltage through the first diode, the high-end floating power supply voltage of the first gate driver is connected to the high-end floating power supply offset voltage through the eighth capacitor C8, and the common end of the first gate driver is grounded; The collector of the first transistor is connected to the shutdown pin of the first gate driver on the one hand, and is connected to the 12V power supply voltage through the sixth resistor on the other hand, and is grounded through a branch formed by the fifteenth capacitor and the sixteenth capacitor connected in parallel. The IO port is connected to the base of the first transistor through the fourth diode and the eleventh resistor on the one hand, and is connected to the power ground through the twelfth resistor and the emitter of the first transistor on the other hand.

4. The wireless power transmission device with load data feedback according to claim 1, characterized in that: The main circuit includes a transmitting coil, a first field effect transistor, a second field effect transistor, a first inductor, a first DCDC converter, a first transistor, nineteenth to twenty-fifth capacitors, and thirteenth to fifteenth resistors; The 24V power supply voltage is connected to the input end of the first DCDC converter through the first inductor on the one hand, and is grounded through the capacitor and the common end of the first DCDC converter on the other hand; the output end anode of the first DCDC converter is connected to the ground through the thirteenth resistor on the one hand, and through the branch formed by the twentieth capacitor and the twenty-first capacitor in parallel on the other hand; the other end of the thirteenth resistor is connected to the ground through the branch formed by the twenty-second capacitor and the twenty-third capacitor in parallel on the one hand, and is connected to the drain of the first field effect tube on the other hand; The 80V power supply voltage is grounded through the thirteenth resistor and the parallel branch formed by the twenty-second and twenty-third capacitors, and is connected to the drain of the first field effect transistor on the other hand, and is connected to one end of the transmitting coil through the twenty-fourth capacitor; the source of the first field effect transistor is connected to the other end of the transmitting coil on the one hand, and is connected to the drain of the second field effect transistor on the other hand; the drain of the second field effect transistor is connected to one end of the transmitting coil, and the source is connected to the power ground on the one hand, and is connected to the other end of the transmitting coil through the twenty-fifth capacitor.

5. The wireless power transmission device with load data feedback according to claim 1, characterized in that: The feedback detection circuit includes a first operational amplifier, a first voltage comparator, a fifth diode, twenty-sixth to thirtieth capacitors, and sixteenth to twenty-fifth resistors; The sixteenth resistor, the nineteenth resistor, the twentieth resistor and the twenty-second resistor are adjustable resistors; One end of the transmitting coil connected to the twenty-fourth capacitor and the twenty-fifth capacitor is grounded through the twenty-third resistor on the one hand, and is connected to one end of the twenty-second resistor through a parallel branch formed by the fifth diode, the twenty-fourth resistor, the twenty-fifth resistor, the twenty-ninth capacitor, and the thirtieth capacitor on the other hand; the middle tap end of the twenty-second resistor is connected to the non-inverting input end of the first voltage comparator, and the other end of the twenty-second resistor is grounded; the inverting input end of the first operational amplifier is connected to the middle tap of the sixteenth resistor; one end of the fixed end of the sixteenth resistor is connected to the power supply, and the other end is connected to the output end of the first operational amplifier through the eighteenth resistor; the positive power supply end of the first voltage comparator is connected to the power supply; the common end of the first operational amplifier is grounded, and the output end of the first operational amplifier is grounded through the seventeenth resistor and the twenty-sixth capacitor; The PD5 pin of the first single-chip computer is connected to the middle tap end of the nineteenth resistor, one end of the fixed end of the nineteenth resistor is connected to the 12V power supply through the twenty-first resistor, and the other end is connected to the output pin of the first voltage comparator; the inverting input end of the first voltage comparator is connected to the middle tap of the twenty-fourth resistor, and the two ends of the twenty-fourth resistor are respectively connected to the 12V power supply and ground; the positive power supply end of the first voltage comparator is connected to the 12V power supply; the common end of the first voltage comparator is grounded; the 12V power supply is grounded through the branch formed by the parallel connection of the twenty-third capacitor and the twenty-fourth capacitor.

6. The wireless power transmission device with load data feedback according to claim 1, characterized in that: The receiving circuit includes a secondary coil, a third field effect transistor, a first thyristor, a third crystal oscillator, a second single chip computer, a second inverter, a sixth diode to a fourteenth diode, a thirty-first to a forty-second capacitor, and a twenty-sixth to a thirty-second resistor; The twelfth diode is an electrostatic protection diode; The front end of the secondary coil passes through the 31st capacitor, and the rear end passes through the 38th capacitor. The AC is rectified into DC through the rectifier bridge formed by four diodes, and then connected to the load after passing through the 32nd capacitor, the 33rd capacitor, and the 27th resistor; the rear end of the secondary coil is connected to the source of the third field effect tube through the 39th capacitor; the gate of the third field effect tube is connected to the PD5 interface of the second single chip computer through the 28th resistor on the one hand; and is grounded through the 29th resistor and the drain of the third field effect tube on the other hand; The external crystal oscillator input pin and output pin of the second single-chip microcomputer are connected to the frequency input pin and frequency output pin of the third crystal oscillator respectively, the analog reference voltage pin of the second single-chip microcomputer is grounded through the thirty-fourth capacitor, the reset pin of the first single-chip microcomputer is connected to the 3.3V power supply terminal through the twenty-sixth resistor on the one hand, and is connected to the RTS pin of the burning port through the thirty-seventh capacitor on the other hand; the input terminal of the second single-chip microcomputer is connected to the 3.3V power supply terminal on the one hand, and is grounded to the common terminal of the second single-chip microcomputer through the parallel branch composed of the thirty-fifth capacitor and the thirty-sixth capacitor on the other hand; After the AC voltage of the secondary coil is converted into DC, the positive voltage passes through the 30th resistor and the 10th diode, and then passes through the 12th diode and the 40th capacitor to form a parallel branch, and the positive end outputs a 3.3V voltage to power the single-chip microcomputer, and the negative end is grounded; The PD4 end of the second inverter is connected to the gate of the first thyristor through the eleventh diode on one hand, and is grounded through the forty-first capacitor on the other hand; the positive pole of the secondary coil after converting DC is connected to the source of the first thyristor; the drain of the first thyristor is grounded through the thirty-first resistor.

7. A wireless power transmission method with load data feedback, characterized in that: A wireless power transmission device with load data feedback as claimed in any one of claims 1 to 6; The method comprises the following steps: The energy transfer process of electromagnetic induction is as follows: The front-stage circuit of the system divides the 24V power input into two paths. One path increases the voltage through the boost circuit, and quickly charges the twentieth capacitor and the twenty-first capacitor through the thirteenth resistor of the main circuit; the other path generates a pair of complementary PWM waves through the first single-chip microcomputer output PWM wave of the control circuit and the first inverter of the drive circuit, and respectively connects the input ends of the first optocoupler and the second optocoupler of the drive circuit to realize the electrical isolation of the control circuit and the drive circuit, and the output end is respectively connected to the LIN end and the HIN end of the first gate driver through the fifth resistor and the eighth resistor of the drive circuit; the main circuit is controlled by complementary pulse width modulation signals. The first field effect tube of the circuit and the switch of the first field effect tube; the first single-chip computer IO port of the control circuit triggers the first triode to turn on through the fourth diode and the eleventh resistor of the driving circuit, so as to send a high-level signal to the SD end of the first gate driver, triggering the first gate driver to turn on, so that the charged electrolytic capacitor is discharged quickly, driving the half-bridge inverter to generate high-frequency alternating current, and then stimulating the transmitting coil of the main circuit; the transmitting coil and the receiving coil of the main circuit are coaxially opposed and completely symmetrically arranged, and the transmitting coil transmits the high-frequency alternating current power to the receiving coil through magnetic coupling resonance to power the load, thereby realizing wireless transmission of power; The load data feedback process of electromagnetic induction is as follows: The PD5 port of the second single-chip microcomputer of the receiving circuit is connected to the gate of the third field effect tube through the twenty-eighth resistor, and the current between the source and the drain is controlled by controlling the gate voltage of the third field effect tube, so as to achieve the function of controlling on and off, and the carrier signal with data information is coupled with the electric energy channel through the thirty-ninth capacitor; the capacitor presents low impedance to the high-frequency carrier signal and high impedance to the low-frequency electric energy signal; The coupling circuit uses the ninth diode of the primary coil, the external resistor and capacitor, and the first voltage comparator of the feedback detection circuit to construct an active filter to filter out the high-frequency data signal. The first voltage comparator will judge the input signal according to its threshold voltage, and output a corresponding high or low level signal, and transmit the signal to the first single-chip microcomputer to realize the load data feedback process.

Images