Wireless power transmission system based on semi-active rectifier

Abstract

A wireless power transmission system based on a semi-active rectifier, comprising an input power supply Vin, a transmitter-side inverter unit, a transmitter-side compensation circuit, a transmitter coil Lp, a receiver coil Ls, a receiver-side compensation circuit, a receiver-side semi-active rectifier, and a load RL. The input power supply Vin is connected to an input end of the transmitter-side inverter unit, midpoints of two bridge arms of the transmitter-side inverter unit serves as output ends and are connected to an input end of the transmitter-side compensation circuit, and an output end of the transmitter-side compensation circuit is connected to the transmitter coil Lp; the receiver coil Ls is magnetically coupled to the transmitter coil Lp, and the receiver coil Ls is connected to an input end of the receiver-side compensation circuit; and one output end of the receiver-side compensation circuit is connected to a midpoint of an active bridge arm of the receiver-side semi-active rectifier, and the other output end is connected to a midpoint of a passive bridge arm of the receiver-side semi-active rectifier; and an output end of the receiver-side semi-active rectifier is connected to the load RL.

Description

Wireless power transfer system based on semi-active rectifier

[0001] This application claims priority to Chinese Patent Application No. 202510135720.7, filed on February 7, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of DC-DC converter technology for power conversion devices, and for example to a wireless power transmission system based on a semi-active rectifier. Background Technology

[0003] In recent years, with the booming development of new energy electric vehicles, contact wired charging solutions have problems such as bulky connectors, complicated operation, easy wear and tear, poor reliability, and easy leakage in rainy and snowy weather. In addition, the length and drag of the power transmission cable limit the flexibility of charging and the maintenance cost is high. The above reasons have greatly limited the application and promotion of new energy electric vehicles.

[0004] To improve the safety, reliability, and flexibility of charging systems, inductive wireless power transfer has become a hot research topic. Compared to traditional plug-in charging, wireless power transfer technology enables electric vehicles to charge instantly upon stopping, offering convenience, speed, and a wide range of applications. It can also reduce urban land costs and utilization. Because there is no direct electrical contact between the vehicle's onboard unit and the power supply unit, and no exposed metal connectors, this technology is safer and more reliable, unaffected by inclement weather, and can be integrated with technologies such as autonomous driving to achieve automation. Therefore, the numerous advantages of wireless power transfer technology give it broad development prospects in the future power supply field of transportation systems.

[0005] In related technologies, the full-bridge active rectifier used in inductive wireless power transfer systems consists of four switching transistors. Its advantage is flexible control. However, it has limitations such as many control variables, the need for precise control of the zero-voltage conduction time of the switching transistors, and the complexity of the sampling circuit for the zero-crossing point of the secondary resonant current. These limitations restrict the rapid development of inductive wireless power transfer systems. Summary of the Invention

[0006] This application provides a wireless power transfer system based on a semi-active rectifier. Addressing the limitations of existing inductive wireless power transfer systems that use four switching transistors in their full-bridge active rectifiers, this application replaces one active bridge arm of the full-bridge active rectifier with a passive bridge arm consisting of two diodes, requiring no additional control. This approach simplifies rectifier control while ensuring soft switching of all transistors on the receiving side. Furthermore, the passive rectification characteristics of the passive bridge arm simplify the secondary resonant current zero-crossing sampling circuit. The designed output voltage control and secondary resonant current zero-crossing detection circuits are simple, easy to control, and readily implementable, demonstrating promising application prospects.

[0007] This application provides a wireless power transfer system based on a semi-active rectifier, including an input power supply V. in Transmitter-side inverter unit, transmitter-side compensation circuit, transmitter coil L p Receiver coil L s Receiver-side compensation circuit, receiver-side semi-active rectifier and load R L ,

[0008] The input power supply V in The output terminal of the transmitter-side inverter unit is connected to the input terminal of the transmitter-side inverter unit. The midpoint of the two bridge arms of the transmitter-side inverter unit serves as the output terminal of the transmitter-side inverter unit and is connected to the input terminal of the transmitter-side compensation circuit. The output terminal of the transmitter-side compensation circuit is connected to the transmitter coil L. p Connected via transmitting coil L p To enable wireless transmission of electrical energy;

[0009] The receiving coil L s With transmitting coil L p A magnetic coupling is formed between them for use with wireless receiving and transmitting coils L. p The wirelessly transmitted electrical energy, the receiving coil L s The receiver-side compensation circuit is connected to its input terminal. One output terminal of the receiver-side compensation circuit is connected to the midpoint of the active bridge arm of the receiver-side semi-active rectifier. The other output terminal of the receiver-side compensation circuit is connected to the midpoint of the passive bridge arm of the receiver-side semi-active rectifier. The output terminal of the receiver-side semi-active rectifier is connected to the load R. L Connected.

[0010] In some embodiments, the transmitter-side inverter unit comprises four junction field-effect transistors (JFETs). p1 S p2 S p3 and S p4 The full-bridge inverter circuit is constructed.

[0011] In some embodiments, the receiver-side semi-active rectifier includes a passive bridge arm unit, an active bridge arm unit, and an output filter capacitor C.o The passive bridge arm unit includes an upper diode D1 and a lower diode D2; the active bridge arm unit includes an upper switching transistor S. s1 , lower switch S s2 ;

[0012] The upper switching transistor S s1 The source of the switch S s2 The drains are connected together and the midpoint of the active bridge arm of the receiving-side semi-active rectifier is connected to one output terminal of the receiving-side compensation circuit.

[0013] The positive terminal of the upper diode D1 and the negative terminal of the lower diode D2 are connected together, and the midpoint of the passive bridge arm of the receiving-side semi-active rectifier is connected to the other output terminal of the receiving-side compensation circuit.

[0014] The cathode of the upper diode D1 and the upper switching transistor S s1 The drain of the capacitor is connected to the output filter capacitor C. o The positive terminals of the diodes are connected together, and the positive terminal of the lower diode D2 is connected to the lower switching transistor S. s2 The source and output filter capacitor C are common. o The negative terminal is connected;

[0015] The output filter capacitor C o The positive and negative terminals serve as the output terminals of the receiving-side semi-active rectifier and the load R. L Connected.

[0016] In some embodiments, the wireless power transmission system based on a semi-active rectifier further includes an output voltage control and secondary resonant current zero-crossing detection circuit, which includes a switching transistor Q1, a main control chip, and a switching transistor driver chip.

[0017] The other output terminal of the receiving-side compensation circuit is connected to the first terminal of the connecting resistor R1 and the drain of the switching transistor Q1. The second terminal of the connecting resistor R1 is connected to the positive output terminal of the receiving-side active rectifier. The gate of the switching transistor Q1 is connected to the power supply of the main control chip. The gate of the switching transistor Q1 is also connected to the external trigger pin of the main control chip through the pull-up resistor R2. The source of the switching transistor Q1 is directly connected to the external trigger pin of the main control chip. The pulse width modulation output pin of the main control chip is connected to the input terminal of the switching transistor driver chip. The output terminal of the switching transistor driver chip is connected to the upper switching transistor S of the active bridge arm unit. s1 Gate and lower switch S s2 The gate is connected.

[0018] In some embodiments, the transmitting-side compensation circuit and the receiving-side compensation circuit are series capacitor compensation circuits, parallel capacitor compensation circuits, inductor-capacitor-capacitor compensation circuits, and inductor-capacitor-inductor compensation circuits.

[0019] In some embodiments, the main control chip is selected from STM32G474, TMS320F28335 or TMS32F28377 micro integrated circuits; the switch driver chip is selected from 2EDF7275KXUMA1 or TPS51604DSGR micro integrated gate driver circuits. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the topology of the wireless power transmission system based on a semi-active rectifier according to this application;

[0021] Figure 2 is a circuit schematic diagram of an embodiment of this application;

[0022] Figure 3 shows the main waveforms during the operation of the embodiment in Figure 2;

[0023] Figure 4 is the equivalent circuit diagram of the fundamental wave decoupling of the system in the embodiment of Figure 2 at the resonant frequency;

[0024] Figure 5 is a schematic diagram of the output voltage control and secondary resonant current zero-crossing detection circuit of the embodiment in Figure 2;

[0025] Figure 6 is a schematic diagram of the modulation strategy of the semi-active rectifier in the embodiment of Figure 2;

[0026] Figure 7 is a timing diagram of the modulation strategy used in the embodiment of Figure 2;

[0027] Figure 8 shows the voltage and current waveforms on the transmitting and receiving sides when the couplers in the embodiment of Figure 2 are mutually inducted. Detailed Implementation

[0028] The present application will now be described in conjunction with the accompanying drawings.

[0029] Compared to traditional full-bridge active rectifiers used in wireless power transfer systems, which consist of four switching transistors and suffer from limitations such as numerous control variables, the need for precise control of the zero-voltage conduction time of the switching transistors, and complex sampling circuits for the zero-crossing point of the secondary resonant current, the wireless power transfer system based on a semi-active rectifier in this application reduces the control parameters of the receiving-side active rectifier by replacing one active bridge arm of the traditional full-bridge active rectifier with a passive bridge arm, thereby simplifying the control strategy on the receiving side. Furthermore, due to the passive rectification characteristics of the passive bridge arm, all switching transistors in the receiving-side semi-active rectifier can achieve zero-voltage conduction characteristics without additional control. Simultaneously, the output voltage control and secondary resonant current zero-crossing point detection circuits are simplified to consist of only one switching transistor and two resistors. As shown in Figure 1, the wireless power transfer system based on a semi-active rectifier in this application includes an input power supply V... in Transmitter-side inverter unit, transmitter-side compensation circuit, transmitter coil L p Receiver coil L s Receiver-side compensation circuit, receiver-side semi-active rectifier and load R L .

[0030] Input power V in The output terminal of the transmitter-side inverter unit is connected to the input terminal of the transmitter-side inverter unit. The midpoint of the two bridge arms of the transmitter-side inverter unit serves as the output terminal of the transmitter-side inverter unit and is connected to the input terminal of the transmitter-side compensation circuit. The output terminal of the transmitter-side compensation circuit is connected to the transmitter coil L. p Connected via transmitting coil L p To enable wireless transmission of electrical energy.

[0031] Receiving coil L s With transmitting coil L p A magnetic coupling is formed between them for use with wireless receiving and transmitting coils L. p The electrical energy transmitted wirelessly is received by coil L. s The receiving-side compensation circuit is connected to its input terminal. One output terminal of the receiving-side compensation circuit is connected to the midpoint of the active bridge arm of the receiving-side semi-active rectifier. The other output terminal of the receiving-side compensation circuit is connected to the midpoint of the passive bridge arm of the receiving-side semi-active rectifier. The output terminal of the receiving-side semi-active rectifier is connected to the load R. L Connected.

[0032] In some embodiments, the transmitter-side inverter unit consists of four junction field-effect transistors (JFETs). p1 S p2 S p3 and S p4 The full-bridge inverter circuit is constructed.

[0033] In some embodiments, the receiver-side active rectifier includes a passive bridge arm unit, an active bridge arm unit, and an output filter capacitor C. oThe passive bridge arm unit includes an upper diode D1 and a lower diode D2; the active bridge arm unit includes an upper switching transistor S. s1 , lower switch S s2 .

[0034] upper switch S s1 The source of the switch S s2 The drain of the circuit is connected to the circuit and is connected to one output terminal of the receiving-side compensation circuit as the midpoint of the active bridge arm of the receiving-side semi-active rectifier.

[0035] The positive terminal of the upper diode D1 and the negative terminal of the lower diode D2 are connected together, and the midpoint of the passive bridge arm of the receiving-side semi-active rectifier is connected to the other output terminal of the receiving-side compensation circuit.

[0036] The cathode of diode D1 and the upper switch S s1 The drain of the capacitor is connected to the output filter capacitor C. o The positive terminals of diodes D2 and S are connected together. s2 The source and output filter capacitor C are common. o The negative terminal is connected.

[0037] Output filter capacitor C o The positive and negative terminals serve as the output terminals of the receiving-side semi-active rectifier and the load R. L Connected.

[0038] In some embodiments, the wireless power transfer system based on a semi-active rectifier further includes an output voltage control and secondary resonant current zero-crossing detection circuit, which includes a switching transistor Q1, a main control chip (i.e., a microcontroller unit (MCU)) and a switching transistor driver chip.

[0039] The other output of the receiving-side compensation circuit is connected to the first terminal of the connecting resistor R1 and the drain of the switching transistor Q1. The second terminal of the connecting resistor R1 is connected to the positive output of the receiving-side active rectifier. The gate of the switching transistor Q1 is connected to the power supply of the main control chip MCU. The gate of the switching transistor Q1 is also connected to the external trigger pin of the main control chip MCU through the pull-up resistor R2. The source of the switching transistor Q1 is directly connected to the external trigger pin of the main control chip MCU. The pulse width modulation (PWM) output pin of the main control chip MCU is connected to the input of the switching transistor driver chip. The output of the switching transistor driver chip is connected to the upper switching transistor S of the active bridge arm unit. s1 Gate and lower switch S s2 The gate is connected.

[0040] In some embodiments, the transmitting-side compensation circuit and the receiving-side compensation circuit may be a series capacitor compensation circuit, a parallel capacitor compensation circuit, an inductor-capacitor-capacitor (LCC) compensation circuit, or an inductor-capacitor-inductor (LCL) compensation circuit, to meet different load characteristic requirements.

[0041] In some embodiments, the main control chip MCU can be selected from STM32G474, TMS320F28335 or TMS320F28377 micro integrated circuit;

[0042] The switching transistor driver chip can be either 2EDF7275KXUMA1 or TPS51604DSGR miniature integrated gate driver circuit.

[0043] The following describes an exemplary embodiment of the wireless power transmission system based on a semi-active rectifier according to this application. As shown in Figure 2, the transmitting-side compensation circuit is an LCC compensation circuit, and the receiving-side compensation circuit is a series compensation circuit. The combination of the two is one of the compensation circuit combinations shown in Figure 1 of this application. The following analysis will take this circuit as an example.

[0044] Figure 3 shows the main waveforms during operation of the embodiment shown in Figure 2 of this application. The upper part of the figure shows the waveforms of the full-bridge inverter, which consists of four switching transistors S. p1 S p2 S p3 and S p4 The inverter consists of switches with a 50% duty cycle, and the two switches on the same bridge arm are complementary in conduction. In the inverter waveform, α represents the phase shift angle between the two bridge arms. According to Fourier analysis, the inverter output voltage u... p The effective value of the AC component U p for:

[0045] ;

[0046] The transmitter-side compensation circuit adopts an LCC compensation topology, L r For series compensation inductance, C p For series compensation capacitors, C r The formula for calculating the compensation element is as follows: (This is a parallel compensation capacitor.)

[0047] ;

[0048] The lower half of Figure 3 shows the waveform of the receiving-side semi-active rectifier. The passive bridge arm diode of the semi-active rectifier moves with the secondary resonant current i.s Passive conduction: When the resonant current flows in the forward direction, the upper diode D1 conducts; when the resonant current flows in the reverse direction, the lower diode D2 conducts. The two metal-oxide-semiconductor field-effect transistors (MOSFETs) in the active bridge arm conduct complementaryly, each with a 50% duty cycle. β is the phase shift angle between the active and passive bridge arms. According to Fourier analysis, the rectifier input voltage u... s The effective value of the AC component U s for:

[0049] ;

[0050] It should be noted that, since a semi-active rectifier has only one controllable bridge arm, the receiving side voltage u s It will lag the secondary coil current i s Phase difference .

[0051] The receiving-side compensation circuit is a series compensation circuit, with a series compensation capacitor C. s The calculation formula is:

[0052] ;

[0053] Figure 4 shows the fundamental frequency decoupling equivalent circuit of the system in the embodiment of Figure 2 of this application at the resonant frequency. This model is sufficiently accurate for high-quality resonant circuits operating at the resonant frequency. In the figure, R... s and R p R represents the loss resistance of the coupler's transmitting coil, receiving coil, and resonant capacitor, respectively. Lr The equivalent loss resistance represents the series compensation inductor; the mutual inductance is equivalent to a controlled voltage source; the inverter is equivalent to an AC power supply; and the active rectifier is equivalent to an equivalent reactance. Based on the equivalent circuit in Figure 4, the voltage-current vector relationship of the resonant circuit in the figure can be expressed as:

[0054] ;

[0055] In the formula Because R in the circuit Lr R p and R s Much smaller than Therefore R Lr R p and R s It is omitted in equation (5).

[0056] The formula with formula Substituting into equation (5), we can obtain the system output voltage V under full load operation. o The relationship between the inverter phase shift angle α and the semi-active rectifier phase shift angle β is as follows:

[0057] ;

[0058] From equation (6), it can be seen that the system output voltage V under full load is o It is positively correlated with the inverter phase shift angle α and negatively correlated with the rectifier phase shift angle β. Therefore, the control of the output voltage can be achieved through the coordinated control of the transmitter-side inverter and the receiver-side semi-active rectifier.

[0059] Figure 5 shows the output voltage control and secondary resonant current zero-crossing detection circuit of the embodiment of Figure 2 in this application. The main function of the circuit in the figure is to control the output voltage and detect the secondary resonant current zero crossing point of the secondary resonant current with an amplitude of V. o The midpoint voltage V of the passive bridge arm of the semi-active rectifier mid This is converted into a 3.3V signal that can be received by the main control chip MCU. zcd The principle is that when the midpoint voltage V of the passive bridge arm... mid When the signal is high, the gate-source voltage of switch Q1 remains unchanged. At this time, switch Q1 is kept off, and signal V... zcd It is pulled up to 3.3V by pull-up resistor R2. And when the midpoint voltage V of the passive bridge arm... mid When the voltage is low, the switching transistor Q1 is not turned on initially, and the body diode of the switching transistor will transmit the signal V. zcd When pulled low, the gate-source voltage of switch Q1 is equal to 3.3V, and switch Q1 will conduct, pulling the signal V low. zcd The voltage. The setting of the PWM counter in the active bridge arm utilizes V. zcd The signal is triggered by the rising edge. As shown in Figure 3, the working principle of the semi-active rectifier indicates that the midpoint voltage V of the passive bridge arm... mid With secondary resonant current i s Phase is consistent, therefore through sampling voltage V zcd The rising edge of the signal can be used to accurately sample the secondary resonant current i. s Passing midnight.

[0060] Figure 6 illustrates the modulation strategy of the semi-active rectifier in the embodiment of Figure 2 of this application. The actual output voltage V in the figure is shown. o With the required output voltage V refThe error value is used to generate the phase shift angle β of the secondary active rectifier through a proportional-integral closed loop to control the output voltage. Figure 7 shows the timing diagram of the modulation strategy used in the embodiment of Figure 2 of this application. Since the upper diode D1 and the lower diode D2 are uncontrolled rectifiers, the synchronization signal V zcd Resonant current i on the secondary side s In phase. This application utilizes signal V zcd The rising edge resets the timer of the active bridge arm PWM to synchronize the drive signals of the receiving-side active rectifier and the transmitting-side inverter. In Figure 7, the comparison value Comp1 is half a cycle larger than Comp2 to realize the switching of the active bridge arm transistor S. s1 and S s2 Both have a 50% duty cycle, and the modulation of the phase shift angle β is achieved by adjusting and changing the comparison value Comp2.

[0061] Based on the above implementation method, a 100W prototype was built in the laboratory, and its main parameters are shown in Table 1.

[0062] Table 1 Main parameters of the experimental prototype

[0063]

[0064] Figure 8 shows the voltage and current waveforms on the transmitting and receiving sides of the embodiment in Figure 2 of this application with different coupler mutual inductances. As can be seen from Figure 8, as the coupler mutual inductance decreases, the phase shift angle α of the transmitting-side inverter gradually increases, while the phase shift angle β of the receiving-side semi-active rectifier is also modulated to ensure that the output voltage Vo meets the requirements. Figure 8 also shows the switching of the passive bridge arm switches D1 and D2 of the semi-active rectifier and the secondary resonant current i. s The commutation times are exactly the same, and the secondary resonant current can ensure zero-voltage conduction characteristics when the switches in the active bridge arm are switched.

[0065] This application presents a wireless power transfer system based on a semi-active rectifier. It replaces one active bridge arm of the full-bridge active rectifier with a passive bridge arm consisting of two diodes, D1 and D2, requiring no additional control. This simplifies rectifier control while ensuring soft switching of all switches on the receiving side. Furthermore, the passive rectification characteristic of the passive bridge arm simplifies the secondary-side resonant current zero-crossing sampling circuit. The designed output voltage control and secondary-side resonant current zero-crossing detection circuits are simple and easy to control. The semi-active rectifier used in this application has only one active bridge arm, reducing the number of control variables on the receiving side and significantly simplifying the control strategy of the receiving-side active rectifier. Simultaneously, due to the passive rectification characteristic of the passive bridge arm, all switches in the receiving-side semi-active rectifier can achieve zero-voltage conduction. The output voltage control and secondary-side resonant current zero-crossing detection circuits are also simplified to consist of only one switch Q1 and two resistors R1 and R2, making them easy to implement and showing promising application prospects.

Claims

1. A wireless power transfer system based on a semi-active rectifier, comprising an input power supply V in Transmitter-side inverter unit, transmitter-side compensation circuit, transmitter coil L p Receiver coil L s Receiver-side compensation circuit, receiver-side semi-active rectifier and load R L , The input power supply V in The output terminal of the transmitter-side inverter unit is connected to the input terminal of the transmitter-side inverter unit. The midpoint of the two bridge arms of the transmitter-side inverter unit serves as the output terminal of the transmitter-side inverter unit and is connected to the input terminal of the transmitter-side compensation circuit. The output terminal of the transmitter-side compensation circuit is connected to the transmitter coil L. p Connected via transmitting coil L p To enable wireless transmission of electrical energy; The receiving coil L s With transmitting coil L p A magnetic coupling is formed between them for use with wireless receiving and transmitting coils L. p The wirelessly transmitted electrical energy, the receiving coil L s The receiver-side compensation circuit is connected to its input terminal. One output terminal of the receiver-side compensation circuit is connected to the midpoint of the active bridge arm of the receiver-side semi-active rectifier. The other output terminal of the receiver-side compensation circuit is connected to the midpoint of the passive bridge arm of the receiver-side semi-active rectifier. The output terminal of the receiver-side semi-active rectifier is connected to the load R. L Connected.

2. The wireless power transmission system based on a semi-active rectifier according to claim 1, wherein, The transmitter-side inverter unit consists of four junction field-effect transistors (JFETs). p1 S p2 S p3 and S p4 The full-bridge inverter circuit is constructed.

3. The wireless power transmission system based on a semi-active rectifier according to claim 1, wherein, The receiver-side active rectifier includes a passive bridge arm unit, an active bridge arm unit, and an output filter capacitor C. o The passive bridge arm unit includes an upper diode D1 and a lower diode D2; the active bridge arm unit includes an upper switching transistor S. s1 , lower switch S s2 ; The upper switching transistor S s1 The source of the switch S s2 The drains are connected together and, as the midpoint of the active bridge arm of the receiving-side semi-active rectifier, are connected to one output terminal of the receiving-side compensation circuit. The positive terminal of the upper diode D1 and the negative terminal of the lower diode D2 are connected together, and the midpoint of the passive bridge arm of the receiving-side semi-active rectifier is connected to the other output terminal of the receiving-side compensation circuit. The cathode of the upper diode D1 and the upper switching transistor S s1 The drain of the capacitor is connected to the output filter capacitor C. o The positive terminals of the diodes are connected together, and the positive terminal of the lower diode D2 is connected to the lower switching transistor S. s2 The source and output filter capacitor C are common. o The negative terminal is connected; The output filter capacitor C o The positive and negative terminals serve as the output terminals of the receiving-side semi-active rectifier and the load R. L Connected.

4. The wireless power transmission system based on a semi-active rectifier according to claim 3 further includes an output voltage control and secondary resonant current zero-crossing detection circuit, wherein the output voltage control and secondary resonant current zero-crossing detection circuit includes a switching transistor Q1, a main control chip, and a switching transistor driver chip. The other output terminal of the receiving-side compensation circuit is connected to the lower end of the connecting resistor R1 and the drain of the switching transistor Q1. The upper end of the connecting resistor R1 is connected to the positive output terminal of the receiving-side active rectifier. The gate of the switching transistor Q1 is connected to the power supply of the main control chip. The gate of the switching transistor Q1 is also connected to the external trigger pin of the main control chip through the pull-up resistor R2. The source of the switching transistor Q1 is directly connected to the external trigger pin of the main control chip. The pulse width modulation output pin of the main control chip is connected to the input terminal of the switching transistor driver chip. The output terminal of the switching transistor driver chip is connected to the upper switching transistor S of the active bridge arm unit. s1 Gate and lower switch S s2 The gate is connected.

5. The wireless power transmission system based on a semi-active rectifier according to claim 1, wherein, The transmitting-side compensation circuit and the receiving-side compensation circuit are series capacitor compensation circuits, parallel capacitor compensation circuits, inductor-capacitor-capacitor compensation circuits, or inductor-capacitor-inductor compensation circuits.

6. The wireless power transmission system based on a semi-active rectifier according to claim 4, wherein, The main control chip is selected from STM32G474, TMS320F28335 or TMS320F28377 micro integrated circuits. The switching transistor driver chip is either 2EDF7275KXUMA1 or TPS51604DSGR miniature integrated gate driver circuit.

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