CN109787312A

CN109787312A - A high frequency constant power wireless charging module based on PWM wave

Info

Publication number: CN109787312A
Application number: CN201910086479.8A
Authority: CN
Inventors: 沈世斌; 滕飞; 张亮; 杨继全; 谢非; 夏俊; 徐东亮; 沈舒雨; 程军; 陈敏
Original assignee: Nanjing Intelligent High-End Equipment Industry Research Institute Co Ltd; Nanjing Normal University
Current assignee: Nanjing Intelligent High-End Equipment Industry Research Institute Co Ltd; Nanjing Normal University
Priority date: 2019-01-29
Filing date: 2019-01-29
Publication date: 2019-05-21

Abstract

The invention discloses a kind of high frequency invariable power wireless charging module based on PWM wave is included the following steps: the on and off for being controlled high frequency power mos pipe using PWM wave, obtains transmitting terminal sine voltage signal；Receiving end sine voltage signal is obtained by electromagnetic coupling, high-frequency reception end sine voltage signal is rectified, obtain direct current signal, direct current signal is subjected to decompression processing by LMZ35003 chip, the voltage and current size for measuring direct current signal after decompression is handled, calculates realtime power, adjusts the duty ratio of IR2104 input terminal PWM wave, change realtime power, realizes and charge to the invariable power of nickel-cadmium cell.The present invention is used for high frequency invariable power wireless charging when power limiting, has charging rate fast, from being emitted to the high advantage of received power conversion efficiency.

Description

A kind of high frequency invariable power wireless charging module based on PWM wave

Technical field

The present invention relates to the technical fields of wireless charging, and in particular to a kind of high frequency invariable power wireless charging based on PWM wave Electric module.

Background technique

In the prior art, the wireless charging under high-frequency will receive the influence of high frequency spurs, and electric energy loss is more；It charged It generates heat in journey serious, electric energy is lost with form of heat, causes greatly to waste；The circuit structure of invariable power charging is complicated, at This is higher, easily breaks down；Chargeable range is small, mostly charges in short-range because wireless power transmission away from From remoter, the consume of power also will be bigger, and energy transmission efficiency will be lower.

Summary of the invention

In view of the deficiencies of the prior art, the invention discloses the high frequency invariable power wireless charging modules based on PWM wave, including Wireless charging transmitting module, wireless charging receiving module and invariable power module；

The wireless charging transmitting module includes Chip Microcomputer A, chip A, high frequency power mos pipe, transmitting coil L1, resonance electricity Hold C1, resonant capacitance C2, inductance L0, diode D1 and tantalum capacitor E1；

Chip Microcomputer A provides the PWM wave of 612kHz, 50% duty ratio for chip A, and PWM wave drives the work of high frequency power mos pipe Under conducting, cut-off both of which, so that resonant capacitance C1, resonant capacitance C2 and transmitting coil L1 is formed resonance, obtain transmitting terminal Sine voltage signal generates alternating magnetic field；

The wireless charging receiving module include chip B, receiving coil L2, resistance R4, resistance R5, resistance R6, resistance R7, Resistance R8, capacitor C4, capacitor C5, capacitor C6, diode D3, diode D4 and tantalum capacitor E3；

Receiving coil L2 is put among transmitting coil L1, induced electromotive force is generated by electromagnetic coupling, obtains receiving end Sine voltage signal, acquisition direct current signal (can refer to: Li Na after receiving end sine voltage signal is carried out full-wave rectification Na, Li Yao, Tang Fangfang, Zhang Ting, Xiao Linhui, simulation study [J] the ship electricity of disabled soldier single-phase full-wave rectifier circuit and active-inverter Technology, 2017,37 (8): 73-74), then direct current signal is subjected to decompression processing by chip B；

The invariable power module includes chip C, chip D, single-chip microcontroller B, sampling resistor R1, resistance R2, resistance R3, capacitor C3, tantalum capacitor E2 and diode D2；

The chip C is used to measure the voltage value and current value of chip B decompression treated direct current signal, and by the voltage Value and current value are transmitted to single-chip microcontroller B, and single-chip microcontroller B calculates realtime power P₁, by changing input terminal pulse width modulation (PWM) signal Duty ratio, and be sent to chip D, change realtime power P₁Size, make decompression treated direct current signal reference power P₀ Invariable power charging is carried out to Ni-Cr battery.

In wireless charging transmitting module, No. 1 pin of the chip A is electric with No. 3 pins of the chip A, 12V respectively The anode connection in source, diode D1；

The cathode of the diode D1 is connect with the anode of No. 8 pins of chip A, tantalum capacitor E1 respectively；

The cathode of the tantalum capacitor E1 is connect with No. 6 pins of chip A, No. 4 pins ground connection of chip A；

No. 2 pins of the chip A are connect with Chip Microcomputer A, and No. 7 pins of chip A and the gate pole of high frequency power mos pipe connect It connects；

The high frequency power mos pipe drain electrode respectively with one end of inductance L0, one end of resonant capacitance C1, resonant capacitance C2 One end connection；

The other end of the inductance L0 inputs 12V power supply, and the other end of the resonant capacitance C1 is connect with transmitting coil L1, The source electrode of high frequency power mos pipe is grounded, the other end ground connection of the resonant capacitance C2, another termination of the transmitting coil L1 Ground；

In wireless charging receiving module, No. 10 pins of the chip B respectively with the anode of tantalum capacitor E3, resistance R7 one End connection；

The cathode of the tantalum capacitor E3 is grounded, and No. 40 pins ground connection of the chip B, No. 1 pin of the chip B connects Ground, No. 37 pins ground connection of the chip B；

The other end of the resistance R7 is connect with No. 36 pins of chip B, one end of No. 31 pins and resistance R5 of chip B Connection, the other end ground connection of resistance R5；

No. 28 pins of the chip B are connect with one end of capacitor C4, the other end ground connection of C4；

No. 27 pins of the chip B are connected with one end of one end of resistance R6, resistance R4 respectively, the other end of resistance R4 Ground connection, the other end of resistance R6 respectively with No. 26 pins of chip, one end of capacitor C5, one end of resistance R8, diode D3 The cathode connection of cathode, diode D4, the other end ground connection of the capacitor C5, the anode of diode D3 is respectively at the one of capacitor C6 One end connection at end, receiving coil L2, the other end of the receiving coil L2 anode with the other end of capacitor C6, diode D4 respectively Connection；

The other end of the resistance R8 is connect with the centre cap of receiving coil L2；

In invariable power module, No. 4 pins of the chip C are grounded, and No. 5 pins of chip C are connect with single-chip microcontroller B, chip C No. 1 pin connect respectively with one end of one end of the resistance R2, sampling resistor R1, the other end and chip of sampling resistor R1 No. 8 pins of C connect, and the other end of resistance R2 is connect with one end of resistance R3, one end of capacitor C3, single-chip microcontroller B respectively；It is described The other end of resistance R3 is grounded, the other end ground connection of capacitor C3；

No. 1 pin of the chip D is connect with the anode of No. 3 pins of chip D, 12V power supply, diode D2 respectively, and two The cathode of pole pipe D2 is connect with the anode of No. 8 pins of chip D, tantalum capacitor E2 respectively；The cathode and chip D of the tantalum capacitor E2 The connection of No. 6 pins, No. 4 pins ground connection of chip D, No. 2 pins of chip D connect with single-chip microcontroller B.

The chip A is IR2104 chip, and chip B is the LMZ35003 chip of Texas Instruments, and chip C is AD8217 chip, chip D are IR2104 chip, the K60 of Chip Microcomputer A model Freescale Semiconductor, single-chip microcontroller Type B number is the K60 of Freescale Semiconductor, and high frequency power mos pipe is IRF610.

The high frequency invariable power wireless charging module based on PWM wave is for realizing with reference power P₀To Ni-Cr battery into The function of row invariable power charging, sets P₀For 20W.

The end VCC of chip A, that is, IR2104 chip provides 12V DC voltage, and the Chip Microcomputer A is the end IN of chip A The PWM wave of 612kHz, 50% duty ratio are provided, make PWM wave driving high frequency power mos pipe IRF610 work in switch state, Transmitting coil L1 and resonant capacitance C1's and resonant capacitance C2 connects in the half period T1 of high frequency power mos pipe IRF610 conducting Series resonance is formed, transmitting coil L1 and resonant capacitance C1 shape in the half period T2 of high frequency power mos pipe IRF610 cut-off At series resonance, the two harmonic waves collectively constitute a sinusoidal signal, and voltage peak-to-peak value is 120V or so；

Filtering and the noise for high-frequency circuit are connected between the drain electrode of high frequency power mos pipe IRF610 and 12V power supply The 320 μ H power ring inductances inhibited；The frequency of signal is higher, more readily receives around signal wire various mixed and disorderly High-frequency noise interferes the transmission of normal signal；When signal frequency is higher, the impedance of power ring inductance can quickly increase Greatly, to inhibit the transmission of high frequency spurs passed through and do not interfere normal signal；[principle and characteristic of power ring inductance can With reference to Gao Fanfu, Tan Xiangyu, Liang Zhirui ferrite bead inhibits the test of the very fast transient overvoltage in 550kV GIS to grind Study carefully [J] High-Voltage Electrical Appliances, 2018,54 (10): 133-134]

Two strands or more cotton-covered wires, the reception of two strands or more cotton-covered wire coilings are wound on receiving coil L2 and transmitting coil L1 The inductance value calculation formula of coil L2 and transmitting coil L1 is as follows:

In formula, L is the inductance value of coil, and D is the average diameter of coil, and W is the width of coil, and N is coil winding the number of turns. Set transmitting coil L1 average diameter D_L1For 20cm, transmitting coil L1 width W₁For 0.1cm, transmitting coil L1 coiling the number of turns N₁For 10 circles set receiving coil L2 average diameter D_L2For 10cm, receiving coil L2 width W₂For 0.1cm, receiving coil L2 coiling circle Number N₂For 8 circles.

When high-frequency signal passes through signal wire, due to " skin effect ", current convergence causes very in the surface portion of signal wire Big current loss, therefore two strands or more cotton-covered wires has been used to come coiling receiving coil L2 and transmitting coil, it is received by increasing The surface area of coil L2 and transmitting coil is lost to reduce.

The invariable power module executes following steps, makes decompression treated direct current signal reference power P₀To nickel chromium triangle electricity Pond carries out invariable power charging:

Step 1, that treated is straight for the end IN+ of chip C, that is, AD8217 chip and chip B, that is, LMZ35003 chip voltage The output end for flowing signal is connected, and will decompression treated after DC signal output end divided by resistance R2, resistance R3 It is transferred to single-chip microcontroller B i.e. single-chip microcontroller K60 and obtains the voltage value U of decompression treated direct current signal₁:

Wherein, R is set₂For 1000 Ω, R₃For 10 Ω, U₂For the voltage after partial pressure on resistance R3, i.e. what single-chip microcontroller B was read Voltage value；

Step 2, the sampling resistor R1 of 20m Ω is connected between the end IN+ and the end IN- of chip C, that is, AD8217 chip, The voltage value U on sampling resistor is obtained from the OUT terminal of chip C, that is, AD8217 chip₃And it is transferred to single-chip microcontroller B i.e. single-chip microcontroller K60, The size of current I of decompression treated direct current signal is obtained by calculation in single-chip microcontroller B, that is, single-chip microcontroller K60₁, size of current I₁It calculates Formula:

Step 3, realtime power P is calculated by single-chip microcontroller B, that is, single-chip microcontroller K60₁, realtime power P₁Calculation formula is as follows:

P₁=U₁·I₁；

Step 4, PWM wave duty cycle alpha is adjusted by single-chip microcontroller B, that is, single-chip microcontroller K60 and is sent to chip D i.e. IR2104 chip The end IN, change the power P of decompression treated direct current signal₁, realize and invariable power charging carried out to Ni-Cr battery.

In step 4, it is as follows that the PWM wave duty cycle alpha adjusts formula:

To solve the problems of the prior art, effective coil winding method is taken and using suitable power magnet ring electricity Sense inhibits high-frequency noise, the present invention provides a kind of high frequency invariable power wireless charging module based on PWM wave, to limit in power High frequency invariable power wireless charging when width provides solution, has electric energy transmission speed fast, and loss is small, and power stability is high Advantage.

Through the implementation of the above technical solution, the beneficial effects of the present invention are: (1) inhibits high frequency using power ring inductance Clutter passes through；(2) multiply cotton-covered wire coiling is used, the loss of electric energy is reduced；(3) full-wave rectification is used, electricity is promoted The efficiency that can be transmitted；(4) stability of invariable power can be improved with quickly calibrated realtime power.

Detailed description of the invention

The present invention is done with reference to the accompanying drawings and detailed description and is further illustrated, it is of the invention above-mentioned or Otherwise advantage will become apparent.

Fig. 1 is flow diagram of the present invention.

Fig. 2 is wireless charging transmitting module schematic diagram in the present invention.

Fig. 3 is wireless charging receiving module schematic diagram in the present invention.

Fig. 4 is invariable power module principle figure in the present invention.

Specific embodiment

The present invention will be further described with reference to the accompanying drawings and embodiments.

As shown in Figure 1, the invention discloses the high frequency invariable power wireless charging module based on PWM wave, including wireless charging Transmitting module, wireless charging receiving module and invariable power module；

As shown in Fig. 2, the wireless charging transmitting module includes Chip Microcomputer A, chip A, high frequency power mos pipe, emission lines Enclose L1, resonant capacitance C1, resonant capacitance C2, inductance L0, diode D1, tantalum capacitor E1, the chip A No. 1 pin respectively with The anode connection of No. 3 pins of the chip A, 12V power supply, the diode D1, the cathode of diode D1 respectively with the core The anode connection of No. 8 pins of piece A, the tantalum capacitor E1, the cathode of tantalum capacitor E1 are connect with No. 6 pins of the chip A, institute State No. 4 pins ground connection of chip A, No. 2 pins of the chip A connect with Chip Microcomputer A, No. 7 pins of the chip A with it is described The gate pole of high frequency power mos pipe connects, the drain electrode of high frequency power mos pipe respectively with the inductance L0, the resonant capacitance C1, institute Resonant capacitance C2 connection is stated, the other end of inductance L0 inputs 12V power supply, and the other end and transmitting coil L1 of resonant capacitance C1 connects It connects, the source electrode ground connection of high frequency power mos pipe, the other end ground connection of resonant capacitance C2, the other end ground connection of transmitting coil L1.Monolithic Machine A provides the PWM wave of 612kHz, 50% duty ratio for chip A, and PWM wave drives the work of high frequency power mos pipe in conducting, cut-off Under both of which, resonant capacitance C1, resonant capacitance C2 and transmitting coil L1 is made to form resonance, obtains transmitting terminal sine voltage letter Number, generate alternating magnetic field；

The wireless charging receiving module include chip B, receiving coil L2, resistance R4, resistance R5, resistance R6, resistance R7, No. 10 pins point of resistance R8, capacitor C4, capacitor C5, capacitor C6, diode D3, diode D4, tantalum capacitor E3, the chip B It is not connect with positive, the described resistance R7 of the tantalum capacitor E3, the cathode ground connection of tantalum capacitor, No. 40 pins of the chip B connect Ground, No. 1 pin ground connection of the chip B, No. 37 pins ground connection of the chip B, the other end of resistance R7 and the chip B's No. 36 pin connections, No. 31 pins of the chip B are connect with the resistance R5, the other end ground connection of resistance R5, the chip B No. 28 pins connect with the capacitor C4, the other end of C4 ground connection, No. 27 pins of the chip B respectively with the resistance R6, affiliated resistance R4 connection, resistance R4 the other end ground connection, the other end of resistance R6 respectively with No. 26 pins of the chip, The cathode connection of the capacitor C5, the resistance R8, the cathode of the diode D3, the diode D4, capacitor C5's is another End ground connection, the anode of diode D3 is respectively at the capacitor C6, the receiving coil L2 connection, the other end point of receiving coil L2 It is not connect with the anode of the other end of capacitor C6, diode D4, the other end of resistance R8 and the centre cap of receiving coil L2 connect It connects.Receiving coil L2 is put among transmitting coil L1, induced electromotive force is generated by electromagnetic coupling, obtains receiving end sine wave Voltage signal, as shown in figure 3, acquisition direct current signal (can refer to: Lee after receiving end sine voltage signal is carried out full-wave rectification Na Na, Li Yao, Tang Fangfang, Zhang Ting, Xiao Linhui, simulation study [J] ship of disabled soldier single-phase full-wave rectifier circuit and active-inverter Power technology, 2017,37 (8): 73-74), then direct current signal is subjected to decompression processing by chip B；

As shown in figure 4, the invariable power module includes chip C, chip D, single-chip microcontroller B, sampling resistor R1, resistance R2, electricity Hinder R3, capacitor C3, tantalum capacitor E2, No. 4 pins ground connection of diode D2, the chip C, No. 5 pins and the monolithic of chip C Machine B connection, No. 1 pin of chip C are connect with the resistance R2, the sampling resistor R1 respectively, the other end of sampling resistor R1 It is connect with No. 8 pins of chip C, the other end of resistance R2 is connect with the resistance R3, the capacitor C3, single-chip microcontroller B respectively, electricity The other end ground connection of R3, the other end ground connection of capacitor C3 are hindered, No. 1 pin of the chip D draws with No. 3 of the chip D respectively The anode connection of foot, 12V power supply, the diode D2, the cathode of diode D2 respectively with No. 8 pins of the chip D, described The anode connection of tantalum capacitor E2, the cathode of tantalum capacitor E2 are connect with No. 6 pins of the chip D, No. 4 pins of the chip D Ground connection, No. 2 pins of the chip D are connect with single-chip microcontroller B.Chip C is used to measure chip B decompression treated direct current signal Voltage value and current value, and the voltage value and current value are transmitted to single-chip microcontroller B, single-chip microcontroller B calculates realtime power P₁, pass through change The duty ratio of input terminal pulse width modulation (PWM) signal, and it is sent to chip D, change realtime power P₁Size, make at decompression Direct current signal reference power P after reason₀Invariable power charging is carried out to Ni-Cr battery.

The chip A is IR2104 chip, and chip B is the LMZ35003 chip of Texas Instruments, and chip C is AD8217 chip, chip D are IR2104 chip, and Chip Microcomputer A is the K60 of Freescale Semiconductor, and single-chip microcontroller B is The K60 of Freescale Semiconductor, high frequency power mos pipe are IRF610.

The end VCC of the IR2104 chip provides 12V DC voltage, and the Chip Microcomputer A provides for the end IN of chip A The PWM wave of 612kHz, 50% duty ratio make PWM wave driving high frequency power mos pipe IRF610 work in switch state, in high frequency Transmitting coil L1 to be formed with resonant capacitance C1 and connecting for resonant capacitance C2 in the half period T1 of power mos pipe IRF610 conducting Series resonance, transmitting coil L1 and resonant capacitance C1, which is formed, in the half period T2 of high frequency power mos pipe IRF610 cut-off goes here and there Join resonance, the two harmonic waves collectively constitute a sinusoidal signal, and voltage peak-to-peak value is 120V or so；

Filtering and noise for high-frequency circuit is connected between the drain electrode of high frequency power mos pipe IRF610 and 12V power supply to press down 320 μ H power ring inductances of system；The frequency of signal is higher, and various mixed and disorderly height are more readily received around signal wire Frequency noise interferes the transmission of normal signal；When signal frequency is higher, the impedance of power ring inductance can quickly increase, To inhibit the transmission of high frequency spurs passed through and do not interfere normal signal；[principle and characteristic of power ring inductance can join Kao Gaofanfu, Tan Xiangyu, Liang Zhirui ferrite bead inhibit the experimental study of the very fast transient overvoltage in 550kV GIS [J] High-Voltage Electrical Appliances, 2018,54 (10): 133-134]

Step 1, the output end of the end IN+ of the AD8217 chip and LMZ35003 chip voltage treated direct current signal Be connected, and will decompression treated is transferred to single-chip microcontroller B i.e. after DC signal output end divided by resistance R2, resistance R3 Single-chip microcontroller K60 obtains the voltage value U of decompression treated direct current signal₁:

Wherein, R is set₂For 1000 Ω, R₃For 10 Ω, U₂The voltage read for voltage, that is, single-chip microcontroller B on resistance R3 after partial pressure Value；

Step 2, the sampling resistor R1 that 20m Ω is connected between the end IN+ and the end IN- of the AD8217 chip, from The OUT terminal of AD8217 chip obtains the voltage value U on sampling resistor₃And it is transferred to single-chip microcontroller B i.e. single-chip microcontroller K60, single-chip microcontroller B is The size of current I of decompression treated direct current signal is obtained by calculation in single-chip microcontroller K60₁, size of current I₁Calculation formula:

P₁=U₁·I₁；

Step 4, PWM wave duty cycle alpha is adjusted by single-chip microcontroller B, that is, single-chip microcontroller K60 and is sent to the end IN of IR2104 chip, Change the power P of decompression treated direct current signal₁, realize and invariable power charging carried out to Ni-Cr battery.

In step 4, it is as follows that the PWM wave duty cycle alpha adjusts formula:

The present invention provides a kind of high frequency invariable power wireless charging module based on PWM wave, implements the technical solution Method and approach it is very much, the above is only a preferred embodiment of the present invention, it is noted that for the general of the art For logical technical staff, various improvements and modifications may be made without departing from the principle of the present invention, these improve and Retouching also should be regarded as protection scope of the present invention.The available prior art of each component part being not known in the present embodiment is subject to reality It is existing.

Claims

1. a high frequency constant power wireless charging module based on PWM wave, is characterized in that, comprises wireless charging transmitting module, wireless charging receiving module and constant power module;

The wireless charging transmitter module includes a single-chip microcomputer A, a chip A, a high-frequency power mos tube, a transmitter coil L1, a resonant capacitor C1, a resonant capacitor C2, an inductance L0, a diode D1 and a tantalum capacitor E1;

MCU A provides chip A with a PWM wave of 612kHz and a 50% duty cycle. The PWM wave drives the high-frequency power mos tube to work in two modes: on and off, so that the resonant capacitor C1, the resonant capacitor C2 and the transmitting coil L1 form resonance , obtain the sine wave voltage signal of the transmitting end, and generate an alternating magnetic field;

The wireless charging receiving module includes a chip B, a receiving coil L2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C4, a capacitor C5, a capacitor C6, a diode D3, a diode D4, and a tantalum capacitor E3;

Place the receiving coil L2 in the transmitting coil L1, and generate induced electromotive force through electromagnetic coupling to obtain a sine wave voltage signal at the receiving end. After full-wave rectification of the sine wave voltage signal at the receiving end, a DC signal is obtained, and then the DC signal is passed through the chip B. perform decompression treatment;

The constant power module includes a chip C, a chip D, a single-chip microcomputer B, a sampling resistor R1, a resistor R2, a resistor R3, a capacitor C3, a tantalum capacitor E2 and a diode D2;

The chip C is used to measure the voltage value and current value of the DC signal after the step-down processing of the chip B, and transmit the voltage value and current value to the single-chip microcomputer B, and the single-chip computer B calculates the real-time power P ₁ by changing the input pulse pulse. Width modulates the duty cycle of the PWM signal and sends it to chip D to change the real-time power P ₁ , so that the DC signal after the step-down process uses the reference power P ₀ to charge the nickel-chromium battery with constant power.

2. a kind of high frequency constant power wireless charging module based on PWM wave according to claim 1, is characterized in that, in the wireless charging transmitting module, the No. 1 pin of described chip A and the No. 3 lead of described chip A respectively. pin, 12V power supply, positive connection of diode D1;

The cathode of the diode D1 is respectively connected with the No. 8 pin of the chip A and the anode of the tantalum capacitor E1;

The negative electrode of the tantalum capacitor E1 is connected to the No. 6 pin of the chip A, and the No. 4 pin of the chip A is grounded;

The No. 2 pin of the chip A is connected to the single-chip microcomputer A, and the No. 7 pin of the chip A is connected to the gate of the high-frequency power mos tube;

The drain of the high-frequency power mos tube is respectively connected with one end of the inductor L0, one end of the resonant capacitor C1, and one end of the resonant capacitor C2;

The other end of the inductor L0 is input with a 12V power supply, the other end of the resonant capacitor C1 is connected to the transmitting coil L1, the source of the high-frequency power mos tube is grounded, the other end of the resonant capacitor C2 is grounded, and the transmitting coil L1 the other end is grounded;

In the wireless charging receiving module, the No. 10 pin of the chip B is respectively connected with the positive electrode of the tantalum capacitor E3 and one end of the resistor R7;

The negative electrode of the tantalum capacitor E3 is grounded, the pin No. 40 of the chip B is grounded, the pin No. 1 of the chip B is grounded, and the pin No. 37 of the chip B is grounded;

The other end of the resistor R7 is connected to the 36th pin of the chip B, the 31st pin of the chip B is connected to one end of the resistor R5, and the other end of the resistor R5 is grounded;

The No. 28 pin of the chip B is connected to one end of the capacitor C4, and the other end of the C4 is grounded;

The No. 27 pin of the chip B is respectively connected with one end of the resistor R6 and one end of the resistor R4, the other end of the resistor R4 is grounded, and the other end of the resistor R6 is respectively connected with the No. 26 pin of the chip, one end of the capacitor C5, and one end of the resistor R8. One end of the diode D3 is connected to the cathode of the diode D3 and the cathode of the diode D4 is connected, the other end of the capacitor C5 is grounded, and the anode of the diode D3 is connected to one end of the capacitor C6 and one end of the receiving coil L2 respectively, and the other end of the receiving coil L2 is Connect to the other end of capacitor C6 and the anode of diode D4;

The other end of the resistor R8 is connected to the center tap of the receiving coil L2;

In the constant power module, the No. 4 pin of the chip C is grounded, the No. 5 pin of the chip C is connected to the single-chip microcomputer B, and the No. 1 pin of the chip C is respectively connected with one end of the resistor R2 and one end of the sampling resistor R1. , the other end of the sampling resistor R1 is connected to pin No. 8 of the chip C, the other end of the resistor R2 is connected to one end of the resistor R3, one end of the capacitor C3, and the microcontroller B respectively; the other end of the resistor R3 is grounded, and the other end of the capacitor C3 is connected to the ground. The other end is grounded;

The No. 1 pin of the chip D is respectively connected with the No. 3 pin of the chip D, the 12V power supply, and the positive pole of the diode D2, and the negative pole of the diode D2 is respectively connected with the No. 8 pin of the chip D and the positive pole of the tantalum capacitor E2; The negative pole of the tantalum capacitor E2 is connected to the No. 6 pin of the chip D, the No. 4 pin of the chip D is grounded, and the No. 2 pin of the chip D is connected to the microcontroller B.

3. a kind of high-frequency constant-power wireless charging module based on PWM wave according to claim ₂ , is characterized in that, the described high-frequency constant-power wireless charging module based on PWM wave is used for realizing that nickel-chromium battery carries out constant charging with reference power P0. Power charging function.

4. The high-frequency constant power wireless charging module based on PWM wave according to claim 3, wherein the VCC terminal of the chip A provides 12V DC voltage, and the single chip A provides the IN terminal of the chip A with 612kHz, The PWM wave with 50% duty cycle makes the PWM wave drive the high-frequency power mos tube to work in the on-off state. A series resonance is formed. In the half period T2 when the high-frequency power mos tube is turned off, the transmitting coil L1 and the resonant capacitor C1 form a series resonance, and the two resonance waveforms together form a sinusoidal signal.

5. a kind of high frequency constant power wireless charging module based on PWM wave according to claim 4, is characterized in that, between the drain of high frequency power mos tube and 12V power supply is connected with the filter for high frequency circuit and noise suppression. 320μH Power Magnetic Ring Inductor.

6. a kind of high-frequency constant power wireless charging module based on PWM wave according to claim 5, is characterized in that, on receiving coil L2 and transmitting coil L1 are wound with more than two strands of yarn-covered wire, and more than two strands of yarn-covered wire are wound around. The formula for calculating the inductance values of the receiver coil L2 and the transmitter coil L1 is as follows:

In the formula, L is the inductance value of the coil, D is the average diameter of the coil, W is the width of the coil, and N is the number of turns of the coil.

7. a kind of high-frequency constant power wireless charging module based on PWM wave according to claim 6, is characterized in that, described constant power module executes the following steps, makes the direct current signal after the step-down processing with reference power P ₀ to nickel-chromium Battery for constant power charging:

Step 1, the IN+ terminal of the chip C is connected to the output terminal of the DC signal after the step-down processing of the chip B, and the output terminal of the DC signal after the step-down processing is divided by the resistor R2 and the resistor R3 and then transmitted to the single-chip microcomputer B. The voltage value U ₁ of the DC signal after the step-down processing is obtained:

Among them, U ₂ is the voltage on the resistor R3 after the voltage division, that is, the voltage value read by the microcontroller B;

Step 2: Connect a 20mΩ sampling resistor R1 between the IN+ terminal and the IN- terminal of the chip C, obtain the voltage value _U3 on the sampling resistor from the OUT terminal of the chip C and transmit it to the single-chip microcomputer B. The single-chip microcomputer B obtains by calculation The current magnitude I ₁ of the DC signal after the step-down processing, the calculation formula of the current magnitude I ₁ :

In step 3, the real-time power P _{1 is calculated by the single-chip microcomputer B, and the calculation formula of the real-time power P 1} _is as follows:

P ₁ =U ₁ ·I ₁ ;

In step 4, the PWM wave duty ratio α is adjusted by the microcontroller B and sent to the IN terminal of the chip D to change the power P ₁ of the DC signal after the step-down processing, so as to realize the constant power charging of the nickel-chromium battery.

8. a kind of high frequency constant power wireless charging module based on PWM wave according to claim 7, is characterized in that, in step 4, described PWM wave duty ratio α adjustment formula is as follows:

9. The high-frequency constant power wireless charging module based on PWM wave according to claim 8, wherein the chip A is an IR2104 chip, the chip B is an LMZ35003 chip, the chip C is an AD8217 chip, and the chip D is an IR2104 chip , the type of single-chip microcomputer A is K60, the type of single-chip microcomputer B is K60, and the high-frequency power mos tube is IRF610.