A dual current source parallel output system based on a contactless power supply system

Abstract

The present invention discloses a dual current source parallel output system based on a contactless power supply system, belonging to the field of power supply technology. The system includes a rectifier and filter unit, a high-frequency transformer, a filter unit, a PWM control unit, a PI adjustment unit, a signal amplification unit, a sampling unit, a touch screen and a reference voltage generation unit. The system solves the technical problems of improving the power supply efficiency, stability and current sharing output performance of the WPS contactless power supply system, can improve transmission efficiency, support higher power transmission, improve the stability of power transmission, achieve precise control of the target current value, effectively improve the system response speed and adjustment accuracy, improve the output stability and power utilization efficiency of the system, and avoid the current imbalance problem caused by load fluctuations.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supplies, and in particular relates to a dual current source parallel output system based on a contactless power supply system. Background Art

[0002] A WPS (Wireless Power Supply) contactless power supply system is a power supply technology that uses electromagnetic coupling to transmit electrical energy. Such systems typically consist of two components: a power supply (supplier) and a power receiver (receiver). The power supply generates a high-frequency electromagnetic field, transferring energy to the receiver through electromagnetic coupling, thereby charging or directly powering batteries or devices. Advantages of WPS contactless power supply systems include eliminating the wear and tear associated with contact connections and providing excellent electrical isolation. They are widely used in consumer electronics, medical devices, industrial equipment, and other fields.

[0003] Existing disadvantages of WPS contactless power supply system:

[0004] Although WPS technology offers high security and convenience, it still faces many challenges in terms of power transmission stability, energy loss control, and current balancing for multiple loads:

[0005] 1. Power supply output stability: In existing WPS systems, power supplies often use a single current source design, making them susceptible to load variations during contactless transmission. This is especially true when power supply fluctuates or the load is heavy. Output current stability cannot be guaranteed, leading to uneven power supply or voltage output deviations.

[0006] 2. Lack of precise current control and regulation: Traditional power supplies typically use simple control circuits that are unable to accurately regulate output current or provide stable output current. Existing systems rarely integrate precise regulation modules such as PI controllers, making dynamic output regulation difficult, especially when power demand fluctuates, resulting in a lack of stable control.

[0007] 3. Lack of current sharing control and protection: Existing power supply designs generally lack parallel current sharing control, making it impossible to achieve effective coordinated output from multiple current sources. Even if some systems use dual current source output solutions, the lack of effective current sharing control strategies can easily lead to output current imbalance due to load fluctuations, thereby reducing overall system efficiency and stability. Summary of the Invention

[0008] The purpose of the present invention is to provide a dual current source parallel output system based on a contactless power supply system, which solves the technical problems of improving the power supply efficiency, stability and current sharing output performance of the WPS contactless power supply system.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A dual current source parallel output system based on a contactless power supply system includes a rectifier filter unit, a high-frequency transformer, a filter unit, a PWM control unit, a PI adjustment unit, a signal amplification unit, a sampling unit, a touch screen, and a reference voltage generation unit. The input end of the rectifier unit is connected to an external AC power supply, and the output end is connected to the primary side of the high-frequency transformer. The secondary side of the high-frequency transformer is connected to the input end of the filter unit. The output end of the filter unit outputs a constant current source I out ;

[0011] The input end of the sampling unit is connected to the output end of the filtering unit, the output end is connected to the input end of the signal amplifying unit, and the output end of the signal amplifying unit is connected to an AD input end of the PI regulating unit;

[0012] The touch screen is connected to the reference voltage generating unit, the reference voltage generating unit is connected to the PI regulating unit, the control signal output end of the PI regulating unit is connected to the control input end of the PWM control unit, and the PWM output end of the PWM control unit is connected to the control end of the rectifier unit;

[0013] The rectifier unit specifically adopts a dual-tube forward converter circuit, and output control is performed by controlling the alternating operation of the two IGBT tubes in the dual-tube forward converter circuit;

[0014] The PI adjustment unit calculates the duty cycle u(t) of the PWM signal through the PI control algorithm, and simultaneously calculates the current sharing error. Based on the duty cycle u(t), the adjustment factors D21 and D22 are added to realize the inter-phase current sharing control calculation and generate the current sharing control signal.

[0015] The PWM control unit receives the current sharing control signal from the PI regulation unit, generates a PWM control signal according to the current sharing control signal, and controls the two IGBT tubes in the rectifier unit;

[0016] The reference voltage generating unit is used to generate reference current data according to the parameters input by the touch screen, and transmit the reference current data to the PI regulating unit through the UART interface.

[0017] Preferably, the filtering unit includes an IGBT tube Q1, an IGBT tube Q2, a diode D1 and a diode D3, the G pole of the IGBT tube Q1 and the G pole of the IGBT tube Q2 constitute the control end of the rectifier unit, the C pole of the IGBT tube Q1 and the cathode of the diode D1 are connected to the external AC power supply, the E pole of the IGBT tube Q1 is connected to the cathode of the diode D1, the cathode of the diode D3 and the E pole of the IGBT tube Q2 are connected to the external AC power supply, and the anode of the diode D3 is connected to the C pole of the IGBT tube Q2;

[0018] The high-frequency transformer is transformer T1. One end of the primary side of transformer T1 is connected to the E pole of IGBT tube Q1, and the other end is connected to the C pole of IGBT tube Q2.

[0019] The filter unit includes a diode D5, a diode D6, an inductor L1 and a capacitor C1. The anode of the diode D5 is the input terminal of the filter unit. One end of the secondary side of the transformer T1 outputs the ground wire and the other end is connected to the anode of the diode D5. The cathode of the diode D5 is connected to the 1st pin of the inductor L1. The 2nd pin of the inductor L1 outputs the constant current source I out , the positive electrode of diode D6 is connected to the ground wire, and the negative electrode is connected to the negative electrode of diode D5. Pin 2 of inductor L1 is the output end of the filter unit. One end of capacitor C1 is connected to pin 2 of inductor L1, and the other end is connected to the ground wire;

[0020] The sampling unit includes a sampling resistor R4, which is connected in series to a constant current source I out On, used for constant current source I out The current is sampled.

[0021] Preferably, the signal amplifying unit is composed of an amplifier A1 and its peripheral circuits, the model of the amplifier A1 is AD623, and the differential input terminals of the amplifier are respectively connected to the two ends of the sampling resistor R4;

[0022] The PI adjustment unit includes a single-chip microcomputer MCU1 and its peripheral circuits. The model of the single-chip microcomputer MCU1 is STM32F030C8T6. The output end of the amplifier A1 is connected to an AD interface AD1 of the single-chip microcomputer MCU1.

[0023] Preferably, the PWM control unit includes a PWM controller IC1, the model of the PWM controller IC1 is NIS6602, the INA terminal, the INB terminal and the DIS terminal of the PWM controller IC1 constitute the control input terminal of the PWM control unit, and a group of IO ports of the single-chip microcomputer MCU1 are respectively connected to the INA terminal, the INB terminal and the DIS terminal, and the group of IO ports constitute the control signal output terminal of the PI regulation unit;

[0024] The OUTA and OUTB terminals of the PWM controller IC1 constitute the PWM output terminals of the PWM control unit. The OUTA and OUTB terminals are connected to the G pole of the IGBT tube Q1 and the G pole of the IGBT tube Q2 respectively.

[0025] Preferably, the reference voltage generating unit includes a single-chip microcomputer MCU2, the model of the single-chip microcomputer MCU2 is STM32F103C8T6, the single-chip microcomputer MCU2 is connected to the touch screen through a serial port, and a UART interface port of the single-chip microcomputer MCU2 is connected to a UART interface of the single-chip microcomputer MCU1.

[0026] Preferably, the specific formula for calculating the duty cycle u(t) of the PWM signal using the PI control algorithm is as follows:

[0027] u(t)=K p ·e(t)+K i ∫e(t)dt;

[0028] e(t)=Is-I measured ;

[0029] Where e(t) represents the reference current Is and the measured current I measured The error between measured The value of is I1 or I2, I1 is the sampling current when the IGBT tube Q1 is turned on, I2 is the sampling current when the IGBT tube Q2 is turned on, K p is the proportionality coefficient, K i is the integration coefficient;

[0030] The reference current Is is obtained from the reference current data input by the user through the touch screen;

[0031] When I measured =I1, the duty cycle u(t) controls the on-time and off-time of the IGBT tube Q1, affecting the phase shift angle of the IGBT tube Q1. The duty cycle u(t) at this time is used as an influencing parameter in the current sharing error calculation, recorded as D21;

[0032] When I measured =I2, the duty cycle u(t) controls the on-time and off-time of the IGBT tube Q2, affecting the phase shift angle of the IGBT tube Q2. The duty cycle u(t) at this time is used as an influencing parameter in the current sharing error calculation, recorded as D22;

[0033] The specific formula for calculating the current sharing error is as follows:

[0034] Judgment condition: Current ratio I1÷I2 judgment: If (I1÷I2)>1, then D22=D21+ΔD, otherwise, D22=D21-ΔD;

[0035] I1 is the sampling current when IGBT tube Q1 is turned on, I2 is the sampling current when IGBT tube Q2 is turned on, ΔD is the adjustment value of the phase shift angle influencing parameter; D21 is the basic phase shift angle of IGBT tube Q1, and D22 is the basic phase shift angle of IGBT tube Q2;

[0036]

[0037] Where D1 is the phase shift angle influencing parameter of the reference current and is used as the reference for phase shift angle adjustment during current sharing control. The preset value of D1 is calculated according to the following formula:

[0038] D1=k×Is+b;

[0039] Where k is the scale factor and b is the offset.

[0040] The dual current source parallel output system based on a contactless power supply system described in the present invention solves the technical problems of improving the power supply efficiency, stability, and current-sharing output performance of the WPS contactless power supply system. The present invention adopts a dual-tube forward converter circuit design. The dual-switch tube structure (Q1, Q2) transmits electrical energy through coupling with a high-frequency transformer, which can improve transmission efficiency while supporting higher power transmission. Compared with a single-switch tube structure, the dual-tube forward converter circuit can reduce switch stress, reduce voltage fluctuations, and improve the stability of power transmission. It integrates a PI controller module, which is processed by a single-chip microcomputer. By sampling the feedback current signal and the current reference signal, it dynamically adjusts the output current of the power supply to achieve precise control of the target current value. This closed-loop control method overcomes the slow response of traditional power supplies to load changes, effectively improving system response speed and regulation accuracy. The introduction of a two-phase current-sharing control algorithm achieves load balancing between the dual current sources, improving system output stability and power efficiency. It avoids current imbalance caused by load fluctuations and ensures stable current output under varying loads. The NSI6602 chip generates a PWM signal, and the IGBT duty cycle is flexibly adjusted based on the compensation signal u(t) output by the PI controller, thereby controlling the on-off time of the switch and adjusting the output power. This ensures system flexibility under varying power demands while improving conversion efficiency and response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a block diagram of the principle diagram of the present invention;

[0042] Figure 2 It is a circuit diagram of the rectifier and filter unit, high-frequency transformer, filter unit and sampling unit of the present invention;

[0043] Figure 3 It is a schematic diagram of the principle diagram interface of the PWM control unit, PI adjustment unit, signal amplification unit, touch screen and reference voltage generation unit of the present invention. DETAILED DESCRIPTION

[0044] like Figure 1-Figure 3 The dual current source parallel output system based on the contactless power supply system shown in the figure includes a rectifier filter unit, a high-frequency transformer, a filter unit, a PWM control unit, a PI adjustment unit, a signal amplification unit, a sampling unit, a touch screen and a reference voltage generation unit. The input end of the rectifier unit is connected to an external AC power supply, and the output end is connected to the primary side of the high-frequency transformer. The secondary side of the high-frequency transformer is connected to the input end of the filter unit. The output end of the filter unit outputs a constant current source I out ;

[0045] The rectifier unit specifically adopts a dual-tube forward converter circuit, and output control is performed by controlling the alternating operation of two IGBT tubes in the dual-tube forward converter circuit.

[0046] The filtering unit includes an IGBT tube Q1, an IGBT tube Q2, a diode D1, and a diode D3. The G pole of the IGBT tube Q1 and the G pole of the IGBT tube Q2 constitute the control end of the rectifier unit. The C pole of the IGBT tube Q1 and the cathode of the diode D1 are connected to the external AC power supply. The E pole of the IGBT tube Q1 is connected to the cathode of the diode D1. The cathode of the diode D3 and the E pole of the IGBT tube Q2 are connected to the external AC power supply. The anode of the diode D3 is connected to the C pole of the IGBT tube Q2.

[0047] The high-frequency transformer is transformer T1. One end of the primary side of transformer T1 is connected to the E pole of IGBT tube Q1, and the other end is connected to the C pole of IGBT tube Q2.

[0048] The filter unit includes a diode D5, a diode D6, an inductor L1 and a capacitor C1. The anode of the diode D5 is the input terminal of the filter unit. One end of the secondary side of the transformer T1 outputs the ground wire and the other end is connected to the anode of the diode D5. The cathode of the diode D5 is connected to the 1st pin of the inductor L1. The 2nd pin of the inductor L1 outputs the constant current source I out , the positive electrode of diode D6 is connected to the ground wire, and the negative electrode is connected to the negative electrode of diode D5. Pin 2 of inductor L1 is the output end of the filter unit. One end of capacitor C1 is connected to pin 2 of inductor L1, and the other end is connected to the ground wire;

[0049] The input end of the sampling unit is connected to the output end of the filtering unit, the output end is connected to the input end of the signal amplifying unit, and the output end of the signal amplifying unit is connected to an AD input end of the PI regulating unit;

[0050] The sampling unit includes a sampling resistor R4, which is connected in series to a constant current source I out On, used for constant current source I out The current is sampled.

[0051] The signal amplification unit is composed of an amplifier A1 and its peripheral circuits. The model of the amplifier A1 is AD623. The differential input terminals of the amplifier are respectively connected to the two ends of the sampling resistor R4.

[0052] The PI adjustment unit includes a single-chip microcomputer MCU1 and its peripheral circuits. The model of the single-chip microcomputer MCU1 is STM32F030C8T6. The output end of the amplifier A1 is connected to an AD interface AD1 of the single-chip microcomputer MCU1.

[0053] The PI regulation unit calculates the duty cycle u(t) of the PWM signal through the PI control algorithm, and performs the current sharing error calculation at the same time. On the basis of the duty cycle u(t), the regulation factors D21 and D22 are added to realize the inter-phase current sharing control calculation and generate the current sharing control signal.

[0054] The specific formula for calculating the duty cycle u(t) of the PWM signal using the PI control algorithm is as follows:

[0055] u(t)=K p ·e(t)+K i ∫e(t)dt;

[0056] e(t)=Is-I measured ;

[0057] Where e(t) represents the reference current Is and the measured current I measured The error between measured The value of is I1 or I2, I1 is the sampling current when the IGBT tube Q1 is turned on, I2 is the sampling current when the IGBT tube Q2 is turned on, K p is the proportionality coefficient, K i is the integration coefficient;

[0058] The reference current Is is obtained from the reference current data input by the user through the touch screen;

[0059] When I measured =I1, the duty cycle u(t) controls the on-time and off-time of the IGBT tube Q1, affecting the phase shift angle of the IGBT tube Q1. The duty cycle u(t) at this time is used as an influencing parameter in the current sharing error calculation, recorded as D21;

[0060] When I measured =I2, the duty cycle u(t) controls the on-time and off-time of the IGBT tube Q2, affecting the phase shift angle of the IGBT tube Q2. The duty cycle u(t) at this time is used as an influencing parameter in the current sharing error calculation, recorded as D22;

[0061] The specific formula for calculating the current sharing error is as follows:

[0062] Judgment condition: Current ratio I1÷I2 judgment: If (I1÷I2)>1, then D22=D21+ΔD, otherwise, D22=D21-ΔD;

[0063] I1 is the sampling current when IGBT tube Q1 is turned on, I2 is the sampling current when IGBT tube Q2 is turned on, ΔD is the adjustment value of the phase shift angle influencing parameter; D21 is the basic phase shift angle of IGBT tube Q1, and D22 is the basic phase shift angle of IGBT tube Q2;

[0064]

[0065] Where D1 is the phase shift angle influencing parameter of the reference current and is used as the reference for phase shift angle adjustment during current sharing control. The preset value of D1 is calculated according to the following formula:

[0066] D1=k×Is+b;

[0067] Where k is the scale factor and b is the offset.

[0068] The touch screen is connected to the reference voltage generating unit, the reference voltage generating unit is connected to the PI regulating unit, the control signal output end of the PI regulating unit is connected to the control input end of the PWM control unit, and the PWM output end of the PWM control unit is connected to the control end of the rectifier unit;

[0069] The PWM control unit includes a PWM controller IC1, the model of the PWM controller IC1 is NIS6602, the INA terminal, the INB terminal and the DIS terminal of the PWM controller IC1 constitute the control input terminal of the PWM control unit, and a group of IO ports of the single-chip microcomputer MCU1 are respectively connected to the INA terminal, the INB terminal and the DIS terminal, and the group of IO ports constitute the control signal output terminal of the PI regulation unit;

[0070] The OUTA and OUTB terminals of the PWM controller IC1 constitute the PWM output terminals of the PWM control unit. The OUTA and OUTB terminals are connected to the G pole of the IGBT tube Q1 and the G pole of the IGBT tube Q2 respectively.

[0071] The PWM control unit receives the current sharing control signal from the PI regulation unit, generates a PWM control signal according to the current sharing control signal, and controls the two IGBT tubes in the rectifier unit.

[0072] The reference voltage generating unit includes a single chip microcomputer MCU2, the model of the single chip microcomputer MCU2 is STM32F103C8T6, the single chip microcomputer MCU2 is connected to the touch screen through a serial port, and a UART interface port of the single chip microcomputer MCU2 is connected to a UART interface port of the single chip microcomputer MCU1.

[0073] The reference voltage generating unit is used to generate reference current data according to the parameters input by the touch screen, and transmit the reference current data to the PI regulating unit through the UART interface.

[0074] A specific application step of this embodiment is as follows:

[0075] Step 1: After the system is powered on, the microcontroller MCU1 initializes each unit, including setting the initial parameters of the ADC and PWM control.

[0076] Step 2: The user sets the target current value (reference current Is) through the touch screen. This information is transmitted to MCU2, which then outputs it to MCU1 through the UART interface for subsequent PI control calculations.

[0077] Step 3: Place the sampling resistor R4 at the output end of the filter unit to measure the output current Iout. Amplifier AD623 amplifies the signal at both ends of the sampling resistor R4 and outputs it to MCU1. MCU1 calculates the sampled current value using Ohm's law.

[0078] The system collects current values ​​I1 and I2 during the switching of Q1 and Q2 respectively;

[0079] Step 4: In the PI control unit, the PI control algorithm is used to calculate the duty cycle u(t) of the PWM signal. The influencing parameter D21 and the influencing parameter D22 are calculated based on the u(t) calculation formula and the sampling current I1 when the IGBT tube Q1 is turned on and the sampling current I2 when the IGBT tube Q2 is turned on.

[0080] Step 5: Calculate the current sharing error and the set judgment condition, that is, the current ratio I1÷I2: If (I1÷I2)>1, then D22=D21+ΔD; otherwise, D22=D21-ΔD; finally, update the phase shift angle influencing parameter D21 of IGBT tube Q1 and the phase shift angle influencing parameter D22 of IGBT tube Q2, and generate the corresponding current sharing control signal based on the updated D21 and D22;

[0081] Step 6: MCU2 controls PWM controller IC1 (NIS6602) based on the current sharing control signal. PWM controller IC1 generates a PWM control signal to control the actions of Q1 and Q2, achieving precise control of the target current value.

[0082] The dual current source parallel output system based on a contactless power supply system described in the present invention solves the technical problems of improving the power supply efficiency, stability, and current-sharing output performance of the WPS contactless power supply system. The present invention adopts a dual-tube forward converter circuit design. The dual-switch tube structure (Q1, Q2) transmits electrical energy through coupling with a high-frequency transformer, which can improve transmission efficiency while supporting higher power transmission. Compared with a single-switch tube structure, the dual-tube forward converter circuit can reduce switch stress, reduce voltage fluctuations, and improve the stability of power transmission. It integrates a PI controller module, which is processed by a single-chip microcomputer. By sampling the feedback current signal and the current reference signal, it dynamically adjusts the output current of the power supply to achieve precise control of the target current value. This closed-loop control method overcomes the slow response of traditional power supplies to load changes, effectively improving system response speed and regulation accuracy. The introduction of a two-phase current-sharing control algorithm achieves load balancing between the dual current sources, improving system output stability and power efficiency. It avoids current imbalance caused by load fluctuations and ensures stable current output under varying loads. The NSI6602 chip generates a PWM signal, and the IGBT duty cycle is flexibly adjusted based on the compensation signal u(t) output by the PI controller, thereby controlling the on-off time of the switch and adjusting the output power. This ensures system flexibility under varying power demands while improving conversion efficiency and response speed.

Claims

1. A dual current source parallel output system based on a contactless power supply system, characterized by: Including rectifier filter unit, high frequency transformer, filter unit, PWM control unit, PI The input end of the adjustment unit, signal amplification unit, sampling unit, touch screen and reference voltage generation unit is connected to the external AC The power supply and output end are connected to the primary side of the high-frequency transformer, the secondary side of the high-frequency transformer is connected to the input end of the filter unit, and the output end of the filter unit outputs a constant current source. I out ; The input end of the sampling unit is connected to the output end of the filtering unit, the output end is connected to the input end of the signal amplifying unit, and the output end of the signal amplifying unit is connected to the PI One of the regulating units AD Input terminal; The touch screen is connected to the reference voltage generating unit, and the reference voltage generating unit is connected to PI Adjustment unit, PI The control signal output terminal of the regulating unit is connected PWM Control input of the control unit, PWM Control unit PWM The output end is connected to the control end of the rectifier and filter unit; The rectifier and filter unit specifically adopts a dual-tube forward converter circuit, which controls the two IGBT The output is controlled by alternating operation of the tubes; PI The adjustment unit passes PI The control algorithm calculates PWM Duty cycle of the signal u ( t ), and calculate the current sharing error at the same time, and finally get the phase shift angle influencing parameters D 21 and phase shift angle affect parameters D 22. Implement inter-phase current sharing control calculation and generate current sharing control signals; PWM The control unit receives PI The current sharing control signal of the regulating unit is generated according to the current sharing control signal PWM Control signal, and the two rectifier filter units IGBT Controlled by tube; The reference voltage generating unit is used to generate reference current data according to the parameters input by the touch screen, and UART The interface transmits the reference current data to PI Regulation unit; The rectification and filtering unit includes IGBT Tube Q 1. IGBT Tube Q 2. Diode D 1 and diode D 3. IGBT Tube Q 1 of G Jihe IGBT Tube Q 2 of G The pole constitutes the control end of the rectifier and filter unit. IGBT Tube Q 1 of C Pole and diode D 1's negative terminal is connected to the external AC power supply, IGBT Tube Q 1 of E Pole and diode D 1, the negative terminal of the diode is connected D 3 negative electrode and IGBT Tube Q 2 of E External connection AC Power supply, diode D 3's positive electrode and IGBT Tube Q 2 of C Pole connection; High frequency transformer is a transformer T 1. Transformer T 1's primary side is connected to IGBT Tube Q 1 of E The other end is connected IGBT Tube Q 2 of C pole; The filter unit includes a diode D 5. Diode D 6. Inductor L 1 and capacitor C 1. Diode D The positive pole of 5 is the input terminal of the filter unit, and the transformer T One end of the secondary side of 1 outputs the ground wire, and the other end is connected to the diode D 5. The positive connection of the diode D 5. Negative connection inductor L Pin 1 of 1, inductor L Pin 2 of 1 outputs constant current source I out ,diode D The positive pole of 6 is connected to the ground wire and the negative pole is connected to the diode D 5's negative pole, inductor L Pin 2 of 1 is the output terminal of the filter unit, capacitor C One end of 1 is connected to the inductor L Pin 2 of 1 and the other end are connected to the ground wire; The sampling unit includes a sampling resistor R4 , sampling resistor R4 In series with a constant current source I out On, used for constant current source I out The current is sampled; use PI The control algorithm calculates PWM Duty cycle of the signal u ( t ) is as follows: ； ； in, e ( t ) represents the reference current Is The measured current I measured The error between I measured The value of I 1 or I 2, I 1 for IGBT Tube Q 1 sampling current when it is on, I 2 for IGBT Tube Q 2 sampling current when it is turned on, K p is the proportionality coefficient, K i is the integration coefficient; Reference current Is Obtained from the reference current data input by the user through the touch screen; when I measured = I 1, duty cycle u ( t )control IGBT Tube Q 1's on-time and off-time affect IGBT Tube Q 1 phase shift angle, the duty cycle at this time u ( t ) is used as an influencing parameter to participate in the calculation of the current sharing error, which is recorded as D twenty one; when I measured = I 2, duty cycle u ( t )control IGBT Tube Q 2. The on-time and off-time of IGBT Tube Q 2 phase shift angle, the duty cycle at this time u ( t ) is used as an influencing parameter to participate in the calculation of the current sharing error, which is recorded as D twenty two; The specific formula for calculating the current sharing error is as follows: Judgment condition: current ratio I 1÷ I 2. Judgment: If ( I 1÷ I 2) > 1, then D 22 = D 21+ ΔD ,on the contrary, D 22 = D twenty one- ΔD ; I 1 for IGBT Tube Q 1 sampling current when it is on, I 2 for IGBT Tube Q 2 sampling current when it is turned on, ΔD is the adjustment value of the parameters affecting the phase shift angle; D 21 IGBT Tube Q The basic phase shift angle of 1, D 22 IGBT Tube Q The basic phase shift angle of 2; ； in, D 1 is the phase shift angle influencing parameter of the reference current, which is used as the reference for phase shift angle adjustment during the current sharing control process. D The preset value of 1 is calculated according to the following formula; ； in, k is the proportionality coefficient, b is the offset.

2. The dual current source parallel output system based on the contactless power supply system according to claim 1, characterized in that: The signal amplification unit is composed of an amplifier A 1 and its peripheral circuit composition, amplifier A The model number of 1 is AD 623, the differential input terminals of the amplifier are respectively connected to the sampling resistors R4 Both ends of described PI The regulation unit includes a single chip microcomputer MCU 1 and its peripheral circuits, microcontroller MCU The model number of 1 is STM 32 F 030 C 8 T 6. Amplifier A The output terminal of 1 is connected to the microcontroller MCU 1 of AD interface AD 1.

3. The dual current source parallel output system based on the contactless power supply system according to claim 2, characterized in that: described The control unit includes PWM Controller [[ID= 1, ​ Controller ​ The model number of 1 is ​ 6602, ​ Controller ​ 1 of ​ end, ​ Duanhe ​ The end constitutes ​ The control input terminal of the control unit, the microcontroller ​ A group of 1 ​ Mouth and ​ end, ​ Duanhe ​ end connection, the group ​ The mouth is composed ​ A control signal output terminal of the regulating unit; ​ Controller ​ 1 of ​ Duanhe ​ The end constitutes ​ Control unit ​ Output terminal, ​ Duanhe ​ End respectively with ​ Tube Q 1 of G Jihe ​ Tube Q 2 of G Pole connection.

4. The dual current source parallel output system based on the contactless power supply system according to claim 3, characterized in that: The reference voltage generating unit includes a single chip microcomputer ​ 2. Microcontroller ​ The model number of 2 is ​ 32 F 103 C 8 T 6. Microcontroller ​ 2. Connect to the touch screen through the serial port, microcontroller ​ 2 one ​ Interface connection microcontroller ​ 1 of ​ interface.

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