A multi-height programmable wireless power transmission composite suspension system

Abstract

The present invention discloses a multi-height programmable wireless power transmission composite suspension system, comprising: a transmitting end, the transmitting end comprising an excitation source and a transmitting coil connected in series in sequence; a suspension body, the suspension body comprising a receiving coil and an AC phase angle control unit connected in series in sequence; and a system controller connected to the excitation source and the AC control unit respectively, the system controller is used to control the excitation source to adjust the first AC current of the transmitting coil, and to control the AC phase angle control unit to adjust the second AC circuit of the receiving coil. The magnetic suspension is realized by using the force generated by the magnetic field of the transmitting coil and the receiving coil, and wireless power transmission and magnetic suspension height control are realized at the same time.

Description

Technical Field

[0001] The invention belongs to the field of wireless power transmission and electronic technology, and in particular relates to a multi-height programmable wireless power transmission composite suspension system. Background Art

[0002] Wireless power transmission is currently widely used, and magnetic levitation technology is mostly used in transportation and various toys. The combination of the two can be used in various commercial applications such as transportation, various toys, and commercial publicity. In current commercial applications, magnetic levitation bulbs are the product of the combination of wireless power transmission and magnetic levitation. The principle is that the electromagnetic coil on the base of the magnetic levitation system and the permanent magnet on the levitation body interact with each other to generate magnetic force under the magnetic field to achieve suspension, that is, the electromagnetic force formed by the interaction of DC. Therefore, the magnetic levitation force is uncontrollable and the suspension height is immutable. Magnetic levitation and wireless power transmission are two independent subsystems.

[0003] In fact, the transmitting coil and receiving coil of wireless power transmission will generate an AC magnetic field when there is current. The magnetic field force generated between the AC currents is used to achieve magnetic levitation, thereby reducing the volume and weight of the suspension system and reducing hardware costs.

[0004] At present, there is no reported technical solution for realizing magnetic levitation by utilizing the electromagnetic force generated by the interaction between the high-frequency alternating current generated by the magnetic fields of the transmitting coil and the receiving coil, and solving the multi-suspension system of real-time wireless power transmission and highly programmable magnetism at the same time. Summary of the invention

[0005] The present invention proposes a multi-height programmable wireless power transmission composite suspension system based on alternating current electromagnetic force and phase angle control, which utilizes the force generated by the magnetic fields of the transmitting coil and the receiving coil themselves to achieve magnetic suspension, thereby solving the problem of simultaneously achieving wireless power transmission and highly programmable magnetic suspension. The magnetic suspension force is generated by the interaction between the alternating currents, wherein the receiving coil is one or more independent coils.

[0006] The present invention provides a multi-height programmable wireless power transmission composite suspension system, which includes a transmitting end part, a plurality of receiving end parts and a system controller; the transmitting end part is divided into a physical fixed part, including an excitation source and a transmitting coil connected in series in sequence; the system controller controls the excitation source and the transmitting coil alternating current The receiving ends are divided into suspension parts and are independent of each other, including receiving coils connected in series and respective phase angle control units. Each receiving coil is connected in series with its own phase angle control unit. The system controller controls the phase angle control unit and the AC current of each receiving coil, and can control the suspension height of the receiving end parts, that is, by controlling the AC current of the transmitting coil. The AC current of the receiving coil , M∈[1,N], and M is a positive integer, the electromagnetic force generated Realize variable pitch control;

[0007] The excitation source of the transmitting end part is used for primary side high frequency drive of wireless power transmission;

[0008] The transmitting coil of the transmitting end part is used for wireless energy transmission, and the alternating current of the transmitting coil interacts with the alternating current of the receiving coil to generate magnetic levitation force;

[0009] The receiving coil of the suspension body is used for wireless energy transmission and reception, and the alternating current of the transmitting coil interacts with the alternating current of the receiving coil to generate a magnetic suspension force;

[0010] The AC phase angle control unit adopts a direct AC-AC circuit topology of an active parameter T-type filter; the AC phase angle control unit tracks the AC current of the transmitting coil And implement AC phase angle control on the AC current of its own receiving coil, and realize The size and phase angle of the transmitting coil can be programmed to change the AC current The AC current of the receiving coil The electromagnetic force between them changes the levitation height The suspension has N different suspensions and their suspension heights are the same or different, and the suspension height of the Mth suspension is ;

[0011] The system controller controls the phase angle control unit and the AC current of each receiving coil, and can control the suspension height of several receiving end parts, that is, by controlling the AC current itself to generate magnetic force, that is, by controlling the AC current of the transmitting coil. The AC current of the receiving coil The generated electromagnetic force realizes distance control; the system controller implements suspension height control, including controlling the transmitting end part and several receiving end parts; the transmitting end part is controlled by the system controller to control the excitation source and the transmitting coil; the receiving end part is controlled by the system controller to control the receiving coil and the phase angle control unit / power factor correction unit; the variable frequency wireless power transmission is realized while controlling the suspension height of the electronic load.

[0012] Furthermore, the double-side control scheme includes a transmitting end part and a plurality of suspensions, wherein the transmitting end part is controlled by the system controller to control the excitation source and the transmitting coil; the suspension is controlled by the system controller to control the receiving coil and the AC phase angle control unit. Control; realize wireless power transmission while controlling the suspension height of the electronic load ;

[0013] The system controller controls the transmitting coil and the receiving coil to achieve variable frequency and same frequency magnetic resonance wireless power transmission;

[0014] Take the Mth suspended body suspension height control as an example. The Mth suspended body suspension height is The controls include:

[0015] The system controller collects the suspension height as , the voltage of the transmitting coil and AC current, the voltage uM of the receiving coil and the AC current, through and Implementation of suspension height Control: Increasing the sending coil current iP can increase the magnetic induction intensity B, thereby increasing the magnetic levitation force and increasing the levitation height; The control includes size and AC phase angle control, which is realized by the AC phase angle control unit The size and phase angle can be programmed to change and The magnetic levitation force between the two can change the levitation height. .

[0016] Furthermore, the suspension unilateral control scheme: tracking the AC current of the transmitting coil However, the AC phase angle control is only implemented for the AC current of the receiving coil. The system controller only realizes the AC current of the receiving coil through the AC phase angle control unit. The size and phase angle can be programmed to change and The magnetic levitation force between the two can change the levitation height. ; The system realizes wireless power transmission while controlling the suspension height of the suspension .

[0017] Furthermore, the AC phase angle control unit adopts a direct AC-AC circuit topology of an active parameter T-type filter, and the input end of the AC phase angle control unit is AB, and the output end is CD;

[0018] The first bidirectional power electronic switch S1 and the third bidirectional power electronic switch S3 form a bridge arm, and the midpoint of the bridge arm is connected to point A at the input end of the AC phase angle control unit. The second bidirectional power electronic switch S2 and the fourth bidirectional power electronic switch S4 form another bridge arm, and the midpoint of the bridge arm is connected to point B at the input end of the AC phase angle control unit. The top ends of the first bidirectional power electronic switch S1 and the second bidirectional power electronic switch S2 are connected to point E, and the tail ends of the third bidirectional power electronic switch S3 and the fourth bidirectional power electronic switch S4 are connected to point D at the output end of the AC phase angle control unit. Point E is connected to one end of the first inductor L1, and the other end F of the first inductor L1 is connected to one end of the second inductor L2 and one end of the fifth bidirectional power electronic switch S5. The other end of the second inductor L2 is point C at the output end of the AC phase angle control unit. The other end of the fifth bidirectional power electronic switch S5 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to point D at the output end of the AC phase angle control unit. The fifth bidirectional power electronic switch S5 is connected in series with the first capacitor C1 to form an equivalent variable capacitor Cv.

[0019] The AC phase angle control unit realizes direct AC-AC conversion or AC-DC conversion by controlling the first bidirectional power electronic switch S1, the second bidirectional power electronic switch S2, the third bidirectional power electronic switch S3, and the fourth bidirectional power electronic switch S4:

[0020] when When it is positive, S1 and S4 are turned on. is positive; when When it is positive, S2 and S3 are turned on. is negative; when When it is negative, S2 and S3 are turned on. is positive; when When it is negative, S1 and S4 are turned on. is negative; the on-off of the first capacitor C1 is controlled by controlling the fifth bidirectional power electronic switch S5 to adjust the size of the equivalent variable capacitor Cv, and an active parameter T-type filter is constructed together with the first inductor L1 and the second inductor L2 to achieve active parameter matching under different load conditions.

[0021] The multi-height programmable wireless power transmission composite suspension system of the present application is constructed based on the electromagnetic force of alternating current and phase angle control, and magnetic suspension is achieved by utilizing the force generated by the magnetic fields of the transmitting coil and the receiving coil themselves, thereby achieving wireless power transmission and magnetic suspension height control at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural block diagram of a multi-height programmable wireless power transmission composite suspension system of the present invention;

[0024] Figure 2 It is a schematic diagram of a suspension height control-double-side control scheme of a multi-height programmable wireless power transmission composite suspension system of the present invention;

[0025] Figure 3 It is a schematic diagram of a suspension height control-suspended body control scheme of a multi-height programmable wireless power transmission composite suspension system of the present invention;

[0026] Figure 4 A main circuit topology diagram of a direct AC-AC converter of the AC phase angle control unit of the present invention;

[0027] Figure 5 This is a main circuit diagram when the AC phase angle control unit of the present invention adopts a bidirectional MOSFET power electronic switch. DETAILED DESCRIPTION

[0028] Figure 1 It is a structural block diagram of the multi-height programmable wireless power transmission composite suspension system of the present invention.

[0029] See also Figure 1 The multi-height programmable wireless power transmission composite suspension system includes a transmitting end, a plurality of suspension bodies and a system controller; the transmitting end is a physically fixed part, including an excitation source and a transmitting coil connected in series in sequence; the plurality of suspension bodies are independent and have the same structure, and each suspension body M includes a receiving coil M and an AC phase angle control unit M connected in series in sequence, and the AC phase angle control unit M is then connected in series with its own load M; the system controller controls the entire system, and the AC phase angle control unit M controls the second AC current of the receiving coil Controlling the suspension height of a plurality of suspended bodies; And M is a positive integer.

[0030] The magnetic levitation principle of this application is to send the first alternating current of the coil Generate magnetic field The second alternating current of the receiving coil Generate magnetic field , and the magnetic field With magnetic field The interaction generates magnetic levitation force, sending the first alternating current of the coil The second alternating current of the receiving coil All are AC, control magnetic field With magnetic field The magnitude of the electromagnetic force that interacts with each other remains unchanged, but the direction remains unchanged, that is, the first alternating current of the sending coil is controlled The second alternating current of the receiving coil The size and phase angle of the magnetic levitation force are controlled to ultimately achieve highly programmable magnetic levitation.

[0031] The advantage of this solution is that it uses the transmitting coil and the receiving coil to simultaneously realize energy transmission and force generation, so it has low cost and small size, but it requires the first alternating current With the second AC current The phase angle is controllable, such as 0 or π or other angles required according to actual needs.

[0032] Magnetic levitation force The expression is:

[0033] ,

[0034] In the formula, is the magnetic induction intensity, is the angular frequency of wireless power transmission, is the second alternating current of the receiving coil , for The phase angle of

[0035] because: , is the magnetic permeability, is the current element, is the vector of the current element at a point P in space, is the distance of the current element at a point P in space, A conductor through which current flows;

[0036] because ,therefore To simplify the analysis, it is assumed that the magnetic induction intensity B is uniformly distributed, then the magnetic levitation force for:

[0037] ,

[0038] In the formula, is the amplitude of magnetic induction intensity B, For time;

[0039] The equivalent height plane of the transmitting coil in the physical fixed part is set as the reference plane, and the suspension height of the Mth suspension is .

[0040] When the gravity G of the suspended part is equal to the magnetic levitation force When the suspension reaches equilibrium, the suspended part is suspended. The magnetic induction intensity B is affected by the distance d. The greater the distance d, that is, the higher the suspension height, the smaller the magnetic induction intensity B.

[0041] According to actual needs, the transmitting coil is a coil or a coil group composed of multiple coils with the same resonant frequency. No permanent magnet is added to avoid magnetic influence, especially the change of magnetic saturation degree caused by the addition of permanent magnet, which leads to changes in parameters such as inductance.

[0042] The magnitude of the magnetic field and the electromagnetic force are determined by the current, and the suspension height is controlled by controlling the magnitude of the current. Different from the solution of using permanent magnets or direct current to generate magnetic force, the present invention generates magnetic force by controlling the alternating current itself, that is, by controlling the first alternating current of the transmitting coil. The second AC circuit with the receiving coil The electromagnetic force generated realizes distance control. There are two types of control schemes for the suspension height control of the multi-height programmable wireless power transmission composite suspension system based on AC current electromagnetic force and phase angle control: double-side control scheme and single-side control scheme of the suspension body. Figure 2 , Figure 3 A detailed explanation is given. For the convenience of description, only one suspension is selected for discussion in the suspension part.

[0043] Figure 2 Schematic diagram of the suspension height control-double-side control scheme of the multi-height programmable wireless power transmission composite suspension system.

[0044] The magnitude of the magnetic field is determined by the current, and the suspension height is controlled by controlling the magnitude of the current. Different from the scheme of using the interaction between permanent magnets or direct currents to generate magnetic force, the present invention controls the high-frequency alternating current electromagnetic force generated by the alternating current, that is, by controlling the first alternating current of the transmitting coil. The second AC circuit with the receiving coil The electromagnetic force generated achieves distance control.

[0045] The double-side control scheme includes the transmitter part and several suspensions. The transmitter part is controlled by the system controller to control the excitation source and the transmitter coil; the suspension is controlled by the system controller to control the receiving coil and the AC phase angle control unit. Control; realize wireless power transmission while controlling the suspension height of the electronic load .

[0046] The system controller controls the transmitting coil and the receiving coil to achieve variable frequency and same frequency magnetic resonance wireless power transmission.

[0047] Take the Mth suspended body suspension height control as an example. The Mth suspended body suspension height is The control is as follows:

[0048] Suspension height The essence of the control method is to change the magnetic levitation force The system controller collects the suspension height as , Transmitting coil voltage With the first alternating current , receiving coil voltage With the second alternating current , by applying the first alternating current With the second alternating current Implementation of suspension height Control: Increase the first AC current It can increase the magnetic induction intensity B, thereby increasing the magnetic levitation force and raising the levitation height; the second alternating current The control includes the size and AC phase angle control, and the second AC current is realized by the AC phase angle control unit The magnitude and phase angle of the first AC current can be programmed to change , the second alternating current The magnetic levitation force between the two can change the levitation height. .

[0049] Supplementary explanation: the system controller is implemented based on the suspension height The same frequency conversion control is implemented for the wireless power transmission of the transmitting coil and the receiving coil to improve the transmission efficiency. If the technical difficulty and price cost are taken into consideration, a fixed wireless power transmission frequency can also be used.

[0050] Figure 3 Schematic diagram of the suspension height control - unilateral control scheme of the suspension body of a multi-height programmable wireless power transmission composite suspension system.

[0051] Suspension height control of multi-height programmable wireless power transmission composite suspension system-suspension body single-side control scheme: tracking the first AC current of the transmitting coil But only the second alternating current of its own receiving coil Implementing AC phase angle control, the system controller implements the second AC current of the receiving coil only through the AC phase angle control unit The magnitude and phase angle are programmable to change the first AC current , the second alternating current The magnetic levitation force between the two can change the levitation height. ; The system realizes wireless power transmission while controlling the suspension height of the suspension .

[0052] Figure 4 This is a main circuit topology diagram of a direct AC-AC converter of the AC phase angle control unit of the present invention.

[0053] The AC phase intersection control unit is a direct AC-AC circuit topology of an active parameter T-type filter, and the input end of the AC phase angle control unit is AB, the output end is CD, the first bidirectional power electronic switch S1 and the third bidirectional power electronic switch S3 form a bridge arm, and the midpoint of the bridge arm is connected to point A of the input end of the AC phase angle control unit;

[0054] The second bidirectional power electronic switch S2 and the fourth bidirectional power electronic switch S4 form another bridge arm, and the midpoint of the bridge arm is connected to point B of the input end of the AC phase angle control unit;

[0055] The top ends of the first bidirectional power electronic switch S1 and the second bidirectional power electronic switch S2 are connected to point E, and the tail ends of the third bidirectional power electronic switch S3 and the fourth bidirectional power electronic switch S4 are connected to point D of the output end of the AC phase angle control unit;

[0056] Point E is connected to one end of the first inductor L1, the other end F of the first inductor L1 is connected to one end of the second inductor L2 and one end of the fifth bidirectional power electronic switch S5, the other end of the second inductor L2 is point C at the output end of the AC phase angle control unit, the other end of the fifth bidirectional power electronic switch S5 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to point D at the output end of the AC phase angle control unit, and the fifth bidirectional power electronic switch S5 and the capacitor C1 are connected in series to form an equivalent variable capacitor Cv.

[0057] The AC phase angle control unit controls the first bidirectional power electronic switch S1, the second bidirectional power electronic switch S2, the third bidirectional power electronic switch S3 and the fourth bidirectional power electronic switch S4 to perform direct AC-AC conversion or AC-DC conversion:

[0058] Among them, when the input voltage of the AC phase angle control unit When it is positive, S1 and S4 are turned on, and the output voltage of the AC phase angle control unit is positive;

[0059] when When it is positive, S2 and S3 are turned on. is negative;

[0060] when When it is negative, S2 and S3 are turned on. is positive;

[0061] when When it is negative, S1 and S4 are turned on. is negative;

[0062] The size of the equivalent variable capacitor Cv is adjusted by controlling the fifth bidirectional power electronic switch S5 and the on-off of the control capacitor C1, and an active parameter T-type filter is constructed together with the first inductor L1 and the second inductor L2 to perform active parameter matching under different load conditions.

[0063] Figure 5 This is a main circuit diagram when the AC phase angle control unit of the present invention adopts a bidirectional MOSFET power electronic switch.

[0064] The first bidirectional power electronic switch S1, the second bidirectional power electronic switch S2, the third bidirectional power electronic switch S3, the fourth bidirectional power electronic switch S4 and the fifth bidirectional power electronic switch S5 are all composed of bidirectional MOSFET power electronic switches;

[0065] When two MOSFETs are connected in reverse series, a bidirectional MOSFET power electronic switch is constructed, and the gates of the two MOSFETs are connected together to form the G pole of the bidirectional MOSFET power electronic switch. This bidirectional MOSFET power electronic switch has bidirectional conduction capability. When it is normally turned on, the body diodes of the MOSFETs are turned off, so it has a lower conduction voltage drop.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-height programmable wireless power transmission composite suspension system, characterized in that: It includes a transmitting end part, several receiving end parts and a system controller; the transmitting end is divided into a physical fixed part, including an excitation source and a transmitting coil connected in series in sequence; the system controller controls the alternating current i between the excitation source and the transmitting coil P The receiving ends are divided into suspension parts and are independent of each other, including receiving coils connected in series and respective phase angle control units. Each receiving coil is connected in series with its own phase angle control unit. The system controller controls the phase angle control unit and the AC current of each receiving coil, and can control the suspension height of the receiving end parts, that is, by controlling the AC current i of the transmitting coil P The AC current i of the receiving coil M , M∈[1,N], and M is a positive integer, the electromagnetic force f M Realize variable pitch control; The excitation source of the transmitting end part is used for primary side high frequency drive of wireless power transmission; The transmitting coil of the transmitting end part is used for wireless energy transmission, and the alternating current of the transmitting coil interacts with the alternating current of the receiving coil to generate magnetic levitation force; The receiving coil of the suspension body is used for wireless energy transmission and reception, and the alternating current of the transmitting coil interacts with the alternating current of the receiving coil to generate a magnetic suspension force; The phase angle control unit is an AC phase angle control unit, which adopts a direct AC-AC circuit topology of an active parameter T-type filter; the AC phase angle control unit tracks the AC current i of the transmitting coil. P And implement AC phase angle control on the AC current of its own receiving coil, and realize i M The size and phase angle of the transmitting coil can be programmed to change the AC current i P The AC current i of the receiving coil M The electromagnetic force between them changes the suspension height d M The suspension has N different suspensions and their suspension heights are the same or different. The suspension height of the Mth suspension is d M ; The system controller controls the phase angle control unit and the AC current of each receiving coil, and can control the suspension height of several receiving end parts, that is, by controlling the AC current i of the transmitting coil P The AC current i of the receiving coil M The generated electromagnetic force realizes distance control; the system controller implements suspension height control, including controlling the transmitting end part and several receiving end parts; the transmitting end part is controlled by the system controller to control the excitation source and the transmitting coil; the receiving end part is controlled by the system controller to control the receiving coil, the phase angle control unit, and the power factor correction unit; the variable frequency wireless power transmission is realized while controlling the suspension height of the electronic load.

2. A multi-height programmable wireless power transmission composite suspension system according to claim 1, characterized in that: The control of the suspension height is a double-sided control scheme, which includes the control of the transmitter part and several suspension bodies. The transmitter part is controlled by the system controller to control the excitation source and the transmitting coil; the suspension body is controlled by the system controller to control the receiving coil and the AC phase angle control unit. M Control; realize wireless power transmission while controlling the suspension height of the electronic load M ; The system controller controls the transmitting coil and the receiving coil to achieve variable frequency and same frequency magnetic resonance wireless power transmission; The suspension height of the Mth suspension is d M The controls include: The system controller collects the suspension height d M , the voltage u of the transmitting coil P With the alternating current, the voltage u of the receiving coil M With AC current, through the i P with i M Implementation of suspension height d M Control: Increase the sending coil current i P It can increase the magnetic induction intensity B, thereby increasing the magnetic levitation force and raising the levitation height; i M The control includes size and AC phase angle control, which is realized by AC phase angle control unit. M The size and phase angle are programmable to change the i P with i M The magnitude of the magnetic levitation force between them changes the levitation height d M .

3. A multi-height programmable wireless power transmission composite suspension system according to claim 1, characterized in that: The unilateral control scheme of the suspension is: tracking the AC current i of the transmitting coil P However, the AC phase angle control is only implemented for the AC current of the receiving coil. The system controller only realizes the AC current i of the receiving coil through the AC phase angle control unit. M The size and phase angle are programmable to change the i P with i M The magnitude of the magnetic levitation force between them changes the levitation height d M ; The system realizes wireless power transmission while controlling the suspension height d of the suspension M .

4. A multi-height programmable wireless power transmission composite suspension system according to claim 1, characterized in that: The AC phase angle control unit adopts a direct AC-AC circuit topology of an active parameter T-type filter, the input end of the AC phase angle control unit is AB, and the output end is CD; The first bidirectional power electronic switch S1 and the third bidirectional power electronic switch S3 form a bridge arm, and the midpoint of the bridge arm is connected to point A at the input end of the AC phase angle control unit. The second bidirectional power electronic switch S2 and the fourth bidirectional power electronic switch S4 form another bridge arm, and the midpoint of the bridge arm is connected to point B at the input end of the AC phase angle control unit. The top ends of the first bidirectional power electronic switch S1 and the second bidirectional power electronic switch S2 are connected to point E, and the tail ends of the third bidirectional power electronic switch S3 and the fourth bidirectional power electronic switch S4 are connected to point D at the output end of the AC phase angle control unit. Point E is connected to one end of the first inductor L1, and the other end F of the first inductor L1 is connected to one end of the second inductor L2 and one end of the fifth bidirectional power electronic switch S5. The other end of the second inductor L2 is point C at the output end of the AC phase angle control unit. The other end of the fifth bidirectional power electronic switch S5 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to point D at the output end of the AC phase angle control unit. The fifth bidirectional power electronic switch S5 is connected in series with the first capacitor C1 to form an equivalent variable capacitor Cv. The AC phase angle control unit realizes direct AC-AC conversion or AC-DC conversion by controlling the first bidirectional power electronic switch S1, the second bidirectional power electronic switch S2, the third bidirectional power electronic switch S3, and the fourth bidirectional power electronic switch S4: When the input voltage u of the AC phase angle control unit M When it is positive, S1 and S4 are turned on, and the output voltage u of the AC phase angle control unit LM is positive; when u M When it is positive, S2 and S3 are turned on, u LM is negative; when u M When it is negative, S2 and S3 are turned on, u LM is positive; when u M When it is negative, S1 and S4 are turned on, u LM is negative; the on-off of the first capacitor C1 is controlled by controlling the fifth bidirectional power electronic switch S5 to adjust the size of the equivalent variable capacitor Cv, and an active parameter T-type filter is constructed together with the first inductor L1 and the second inductor L2 to achieve active parameter matching under different load conditions.

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