Wireless charging three-phase rectifier control system and method

Abstract

The invention discloses a wireless charging three-phase rectifier control system and method, and relates to the technical field of power electronics, and the wireless charging system comprises a three-phase power supply module, a three-phase rectifier module, a high-frequency inversion module, a transmitting coil module, a receiving coil module, a rectification filtering module and a system load. The method comprises the steps that a linear active-disturbance-rejection controller of a three-phase rectifier is designed, three-phase alternating current is converted into direct current, then a load is charged through high-frequency inversion, a transmitting coil, a receiving coil and rectification filtering, and voltage and current information needs to be continuously obtained from a receiving end in the charging process and is sent to the three-phase rectifier using linear active-disturbance-rejection. And adjusting the output direct-current voltage, and performing power adjustment. The method provided by the invention is simple in steps and convenient to implement, and can provide a more reliable and high-quality direct-current power supply for a wireless charging system, so that the quality of electric energy finally output by wireless charging is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics, and specifically designs a three-phase rectifier control system and method for wireless charging. Background Art

[0002] Wireless power transmission technology, also known as wireless power transmission or contactless power transmission technology, has revolutionized the traditional way of power transmission. The core of this technology is to convert electrical energy into a form of intermediate energy that can be transmitted through the air through a transmitter, and then convert this intermediate energy back into electrical energy after traveling a certain distance through a receiver. This innovation not only breaks free from the constraints of physical connections, but also opens a new era of power transmission and realizes contactless and convenient power supply. Summary of the invention

[0003] A wireless charging three-phase rectifier control system and method, including a three-phase power supply module, a three-phase rectifier module, a high-frequency inverter module, a transmitting coil module, a receiving coil module and a secondary side compensation topology module, a rectifier filter module and a system load.

[0004] The three-phase power supply is connected to the three-phase rectifier and rectified into a DC voltage. The output of the DC voltage is connected to the DC input end of the high-frequency inverter module. The output end of the high-frequency inverter module is connected to the topology input end of the primary compensation topology and the transmitting coil module. The transmitting coil of the primary compensation topology and the transmitting coil module is arranged opposite to the receiving coil and the receiving coil of the secondary compensation topology module. The output end of the receiving coil and the secondary compensation topology module is connected to the input end of the rectification and filtering module, and the output end of the rectification and filtering module is connected to the system load.

[0005] The three-phase rectifier includes a first bridge arm, a second bridge arm, and a third bridge arm connected in parallel, each bridge arm is composed of two MOSFETs, wherein each MOSFET is an NMOS tube with a body diode, and the body diode is anti-parallel connected between the source and the drain of the NMOS tube. The first bridge arm is connected to the three-phase power supply phase A, the second bridge arm is connected to the three-phase power supply phase B, and the third bridge arm is connected to the three-phase power supply phase C. The drains of the first switch tube, the second switch tube, and the third switch tube are connected to the positive electrode of the DC side of the three-phase rectifier, and the sources of the fourth switch tube, the fourth switch tube, and the fifth switch tube are connected to the negative electrode of the DC side of the three-phase rectifier.

[0006] A three-phase rectifier control for wireless charging includes the following steps:

[0007] Step 1: Establish the mathematical model of the three-phase rectifier. Ignoring the converter's own losses, the mathematical model in the dq0 coordinate system is:

[0008]

[0009] where v dcis the DC voltage, i d is the d-axis current, i q is the q-axis current, e q is the q-axis voltage, e d is the d-axis voltage, L is the AC measured inductance, R is the resistance, and ω is the AC grid angular frequency.

[0010] Step 2

[0011] According to the principle of active disturbance rejection control, an AC side controller is constructed, which consists of a tracking differentiator TD and an extended state observer ESO. The active disturbance rejection controller solves the contradiction between overshoot and rapidity by arranging the transition process. The tracking differentiator is used to solve the noise pollution caused by the typical differentiator, and the extended state observer is used to estimate the compensation error.

[0012] a tracking differentiator form:

[0013] Among them, r0, α0, δ0 are adjustable parameters

[0014] b State Observer ESO form:

[0015] Among them, β1, α1, β2, δ1 are adjustable parameters

[0016] c Linear state error feedback form is:

[0017] Among them, the error e1 is used as input and the nonlinear function is selected. ε i is the error, α is an exponent, the smaller the value, the faster the tracking speed, but the worse the filtering effect, δ is the difference between ε i The size limit, and then according to the system selection and debugging, select the value of r2, α2, δ2, u d is the final control variable

[0018] The high-frequency inverter module includes a first bridge arm and a second bridge arm connected in parallel, each bridge arm is composed of two MOSFETs, wherein each MOSFET is an NMOS tube with a body diode, the body diode is anti-parallel connected between the source and drain of the NMOS tube, the drain of the seventh switch tube and the eighth switch tube is connected to the positive electrode of the DC side of the three-phase rectifier, and the source of the ninth switch tube and the tenth switch tube is connected to the negative electrode of the DC side of the three-phase rectifier. The source of the seventh switch tube and the drain of the ninth switch tube are connected to one end of the transmitting coil, and the source of the eighth switch tube and the drain of the tenth switch tube are connected to the other end of the transmitting coil.

[0019] The high-frequency inverter module inverts the direct current of the three-phase rectifier into high-frequency single-phase alternating current, inputs it into the transmitting coil, and induces high-frequency alternating current in the receiving coil.

[0020] The rectifier and filter module is composed of two bridge arms and a capacitor in parallel. The two bridge arms are respectively composed of two diodes. The cathodes of the first diode and the second diode are connected to the anode of the load, the anodes of the third diode and the fourth diode are connected, the anode of the first diode and the cathode of the third diode are connected to one end of the receiving coil, and the anode of the second diode and the cathode of the fourth diode are connected to the other end of the receiving coil.

[0021] When the wireless system adjusts the output current, it is necessary to adjust the voltage setting value in the three-phase rectifier self-disturbance rejection system, and input the error between the voltage setting value and the actual value into the PI controller. The PI control output is the control quantity id and inputs it into the self-disturbance rejection controller, and the self-disturbance rejection controller completes the control of the DC side voltage. The larger the DC side voltage, the larger the output current that passes through the rectifier and filter module, and the smaller the DC side voltage, the smaller the output current that passes through the rectifier and filter module.

[0022] The present invention adopts the above technical solution, and compared with the prior art, its remarkable effects are as follows:

[0023] The present invention provides a wireless charging three-phase rectifier control system and method, which replaces the traditional PI control with active disturbance rejection control. The active disturbance rejection control can estimate and compensate for the internal and external disturbances of the controlled object in real time, and can effectively improve the output power quality of wireless charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the system structure of the present invention

[0025] Figure 2 The DC side voltage of the three-phase rectifier of the present invention is

[0026] Figure 3 is the current at the wireless charging output end of the present invention DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 1 A three-phase rectifier control system and method for wireless charging is shown, including a three-phase power supply module, a three-phase rectifier module, a high-frequency inverter module, a transmitting coil module, a receiving coil module, a secondary side compensation topology module, a rectifier filter module and a system load.

[0029] The three-phase power supply is connected to the three-phase rectifier and rectified into a DC voltage. The output of the DC voltage is connected to the DC input end of the high-frequency inverter module. The output end of the high-frequency inverter module is connected to the topology input end of the primary compensation topology and the transmitting coil module. The transmitting coil of the primary compensation topology and the transmitting coil module is arranged opposite to the receiving coil and the receiving coil of the secondary compensation topology module. The output end of the receiving coil and the secondary compensation topology module is connected to the input end of the rectification and filtering module, and the output end of the rectification and filtering module is connected to the system load.

[0030] The three-phase rectifier includes a first bridge arm, a second bridge arm, and a third bridge arm connected in parallel, each bridge arm is composed of two MOSFETs, wherein each MOSFET is an NMOS tube with a body diode, and the body diode is anti-parallel connected between the source and the drain of the NMOS tube. The first bridge arm is connected to the three-phase power supply phase A, the second bridge arm is connected to the three-phase power supply phase B, and the third bridge arm is connected to the three-phase power supply phase C. The drains of the first switch tube, the second switch tube, and the third switch tube are connected to the positive electrode of the DC side of the three-phase rectifier, and the sources of the fourth switch tube, the fourth switch tube, and the fifth switch tube are connected to the negative electrode of the DC side of the three-phase rectifier.

[0031] A three-phase rectifier control for wireless charging includes the following steps:

[0032] Step 1: Establish the mathematical model of the three-phase rectifier. Ignoring the converter's own losses, the mathematical model in the dq0 coordinate system is:

[0033]

[0034] where v dc is the DC voltage, i d is the d-axis current, i q is the q-axis current, e q is the q-axis voltage, e d is the d-axis voltage, L is the AC measured inductance, R is the resistance, and ω is the AC grid angular frequency.

[0035] Step 2

[0036] According to the principle of active disturbance rejection control, an AC side controller is constructed, which consists of a tracking differentiator TD and an extended state observer ESO. The active disturbance rejection controller solves the contradiction between overshoot and rapidity by arranging the transition process. The tracking differentiator is used to solve the noise pollution caused by the typical differentiator, and the extended state observer is used to estimate the compensation error.

[0037] a tracking differentiator form:

[0038] Among them, r0, α0, δ0 are adjustable parameters

[0039] b Extended state observer ESO form:

[0040] Among them, β1, α1, β2, δ1 are adjustable parameters

[0041] c Nonlinear state error feedback form is:

[0042] Among them, the error e1 is used as input and the nonlinear function is selected. ε i is the error, α is an exponent, the smaller the value, the faster the tracking speed, but the worse the filtering effect, δ is the difference between ε i The size limit, and then according to the system selection and debugging, select the value of r2, α2, δ2, u d is the final control variable.

[0043] The DC side voltage of the three-phase rectifier under the self-disturbance control is as follows Figure 2 shown.

[0044] The high-frequency inverter module includes a first bridge arm and a second bridge arm connected in parallel, each bridge arm is composed of two MOSFETs, wherein each MOSFET is an NMOS tube with a body diode, the body diode is anti-parallel connected between the source and drain of the NMOS tube, the drain of the seventh switch tube and the eighth switch tube is connected to the positive electrode of the DC side of the three-phase rectifier, and the source of the ninth switch tube and the tenth switch tube is connected to the negative electrode of the DC side of the three-phase rectifier. The source of the seventh switch tube and the drain of the ninth switch tube are connected to one end of the transmitting coil, and the source of the eighth switch tube and the drain of the tenth switch tube are connected to the other end of the transmitting coil.

[0045] The high-frequency inverter module inverts the direct current of the three-phase rectifier into high-frequency single-phase alternating current, inputs it into the transmitting coil, and induces high-frequency alternating current in the receiving coil.

[0046] The rectifier and filter module is composed of two bridge arms and a capacitor in parallel. The two bridge arms are respectively composed of two diodes. The cathodes of the first diode and the second diode are connected to the anode of the load, the anodes of the third diode and the fourth diode are connected, the anode of the first diode and the cathode of the third diode are connected to one end of the receiving coil, and the anode of the second diode and the cathode of the fourth diode are connected to the other end of the receiving coil.

[0047] The current output by the wireless charging system is as follows: Figure 3As shown. When the wireless system adjusts the output current, it is necessary to adjust the voltage setting value in the three-phase rectifier self-disturbance rejection system, and input the error between the voltage setting value and the actual value into the PI controller. The PI control output is the control quantity id and inputs it into the self-disturbance rejection controller, and the self-disturbance rejection controller completes the control of the DC side voltage. The larger the DC side voltage, the larger the output current that passes through the rectifier and filter module, and the smaller the DC side voltage, the smaller the output current that passes through the rectifier and filter module.

Claims

1. A three-phase rectifier control system and method for wireless charging, characterized in that: It includes a three-phase power supply module, a three-phase rectifier module, a high-frequency inverter module, a transmitting coil module, a receiving coil module, a secondary side compensation topology module, a rectifier filter module and a system load. The three-phase power supply is connected to a three-phase rectifier and rectified into a DC voltage. The output of the DC voltage is connected to the DC input end of the high-frequency inverter module. The output end of the high-frequency inverter module is connected to the topology input end of the primary compensation topology and transmitting coil module. The transmitting coil of the primary compensation topology and transmitting coil module is arranged opposite to the receiving coil and the receiving coil of the secondary compensation topology module. The output end of the receiving coil and the secondary compensation topology module is connected to the input end of the rectification and filtering module. The output end of the rectification and filtering module is connected to the system load.

2. A wireless charging three-phase rectifier control system and method according to claim 1, characterized in that: The three-phase rectifier includes a first bridge arm, a second bridge arm, and a third bridge arm connected in parallel, each bridge arm is composed of two MOSFETs, wherein each MOSFET is an NMOS tube with a body diode, and the body diode is anti-parallel connected between the source and the drain of the NMOS tube. The first bridge arm is connected to the three-phase power supply phase A, the second bridge arm is connected to the three-phase power supply phase B, and the third bridge arm is connected to the three-phase power supply phase C. The drains of the first switch tube, the second switch tube, and the third switch tube are connected to the positive electrode of the DC side of the three-phase rectifier, and the sources of the fourth switch tube, the fourth switch tube, and the fifth switch tube are connected to the negative electrode of the DC side of the three-phase rectifier.

3. A wireless charging three-phase rectifier control system and method according to claim 1, characterized in that It includes the following steps: Step 1: Establish the mathematical model of the three-phase rectifier. Ignoring the converter's own losses, the mathematical model in the dq0 coordinate system is: where v dc is the DC voltage, i d is the d-axis current, i q is the q-axis current, e q is the q-axis voltage, e d is the d-axis voltage, L is the AC measuring inductance, R is the resistance, and ω is the AC grid angular frequency. Step 2 According to the principle of active disturbance rejection control, an AC side controller is constructed, which consists of a tracking differentiator TD and an extended state observer ESO. The active disturbance rejection controller solves the contradiction between overshoot and rapidity by arranging the transition process. The tracking differentiator is used to solve the noise pollution caused by the typical differentiator. The extended state observer is used to estimate the compensation error. a tracking differentiator form: Among them, r0, α0, δ0 are adjustable parameters b Extended state observer ESO form: Among them, β1, α1, β2, δ1 are adjustable parameters c Nonlinear state error feedback form is: Among them, the error e1 is used as input and the nonlinear function is selected. ε i is the error, α is an exponent, the smaller the value, the faster the tracking speed, but the worse the filtering effect, δ is the difference between ε i The size limit, and then according to the system selection and debugging, select the value of r2, α2, δ2, u d is the final control variable.

4. A wireless charging three-phase rectifier control system and method according to claim 1, characterized in that: The high-frequency inverter module includes a first bridge arm and a second bridge arm connected in parallel, each bridge arm is composed of two MOSFETs, wherein each MOSFET is an NMOS tube with a body diode, and the body diode is anti-parallel connected between the source and drain of the NMOS tube, the drain of the seventh switch tube and the eighth switch tube is connected to the positive electrode of the DC side of the three-phase rectifier, and the source of the ninth switch tube and the tenth switch tube is connected to the negative electrode of the DC side of the three-phase rectifier. The source of the seventh switch tube and the drain of the ninth switch tube are connected to one end of the transmitting coil, and the source of the eighth switch tube and the drain of the tenth switch tube are connected to the other end of the transmitting coil.

5. A wireless charging three-phase rectifier control system and method according to claim 4, characterized in that: The high-frequency inverter module inverts the direct current of the three-phase rectifier into high-frequency single-phase alternating current, inputs it into the transmitting coil, and induces high-frequency alternating current in the receiving coil.

6. A wireless charging three-phase rectifier control system and method according to claim 1, characterized in that: The rectification and filtering module is composed of two bridge arms and a capacitor in parallel, the two bridge arms are respectively composed of two diodes, the cathodes of the first diode and the second diode are connected to the anode of the load, the anodes of the third diode and the fourth diode are connected, the anode of the first diode and the cathode of the third diode are connected to one end of the receiving coil, and the anode of the second diode and the cathode of the fourth diode are connected to the other end of the receiving coil.

7. A wireless charging three-phase rectifier control system and method according to claim 1, characterized in that: When the wireless system adjusts the output current, it is necessary to adjust the voltage setting value in the three-phase rectifier self-disturbance rejection system, and input the error between the voltage setting value and the actual value into the PI controller. The PI control output is the control quantity id and inputs it into the self-disturbance rejection controller, and the self-disturbance rejection controller completes the control of the DC side voltage. The larger the DC side voltage, the larger the output current that passes through the rectifier and filter module, and the smaller the DC side voltage, the smaller the output current that passes through the rectifier and filter module.

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