Bidirectional wireless power transmission circuit system and system based on variable structure

Abstract

The invention discloses a bidirectional wireless electric energy transmission circuit system based on a variable structure. The bidirectional wireless electric energy transmission circuit system comprises a first variable structure circuit unit, a wireless electric energy transmission module and a second variable structure circuit unit which are sequentially connected in series, and one port AE of the first variable structure circuit unit is connected with one port of a system circuit; the other port HI of the first variable structure circuit unit is connected with one port of the wireless electric energy transmission module, the other port of the wireless electric energy transmission module is connected with the other port OP of the second variable structure circuit unit, and one port MN of the second variable structure circuit unit is connected with one port of the system circuit. Through the variable-structure circuit topology, the technical problem that when a bidirectional wireless power transmission system is under different working conditions, a fixed circuit topology is mutually converted between an input end and an output end, and the technical requirement of instant working conditions cannot be quickly and accurately met is ingeniously solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless power transmission and power electronics, and particularly relates to a bidirectional wireless power transmission circuit system based on variable structure. Background Art

[0002] Wireless power transmission is widely used in fields such as transportation and household appliances, and the application of bidirectional wireless power transmission circuits is also gradually increasing. In the application of bidirectional wireless power transmission circuits, the input end and the output end will be converted with each other under different working conditions, that is, there are different technical requirements for the input end and the output end under different working conditions, which poses strict requirements on the adaptability of the circuit.

[0003] Currently, the circuit topologies of bidirectional wireless power transmission circuits mostly adopt fixed topologies. When the traditional fixed circuit topology is converted between the input end and the output end, it is often difficult to immediately fit the limited-time working conditions, and the technical limitations are obvious. In view of this, the present invention breaks new ground and innovatively uses a variable circuit topology to accurately and efficiently solve the above dilemmas, laying a solid foundation for the stability and optimization of bidirectional wireless power transmission. Summary of the Invention

[0004] The present invention proposes a bidirectional wireless power transmission circuit system based on variable structure. The circuit topology can be changed in real time under different working conditions to meet the immediate technical requirements, and has extremely high flexibility and adaptability. In the application of bidirectional wireless power transmission, the input end and the output end will be converted with each other under different working conditions. If the circuit topology remains fixed, the performance will decline under different working conditions, resulting in a reduction in the overall performance of the system. The variable structure scheme can be adjusted according to different working conditions and different requirements, thereby improving the system performance.

[0005] The present invention uses a variable circuit topology to solve the technical requirement problem that the fixed circuit topology cannot well adapt to the immediate working conditions when the input end and the output end are converted with each other under different working conditions of bidirectional wireless power transmission.

[0006] The present invention cleverly solves the technical requirement problem that the fixed circuit topology cannot quickly and accurately adapt to the immediate working conditions when the input end and the output end are converted with each other under different working conditions of the bidirectional wireless power transmission system through the variable structure circuit topology.

[0007] The present invention provides a two-way wireless power transmission circuit system based on a variable structure, including: a first variable structure circuit unit, a wireless power transmission module, and a second variable structure circuit unit connected in series in sequence. One port AE of the first variable structure circuit unit is connected to one port of the system circuit, another port HI of the first variable structure circuit unit is connected to one port of the wireless power transmission module, another port of the wireless power transmission module is connected to another port OP of the second variable structure circuit unit, and one port MN of the second variable structure circuit unit is connected to one port of the system circuit;

[0008] The first variable structure circuit unit includes a first variable configuration I-shaped filter and a first H-bridge connected in series. One port AE of the first variable configuration I-shaped filter is connected to one port of the system circuit, another port CG of the first variable configuration I-shaped filter is connected to the first H-bridge, and another port HI of the first H-bridge is connected to one port of the wireless power transmission module;

[0009] The second variable structure circuit unit includes a second variable configuration I-shaped filter and a second H-bridge connected in series. One port MN of the second variable configuration I-shaped filter is connected to one port of the system circuit, another port UX of the second variable configuration I-shaped filter is connected to the second H-bridge, and another port OP of the second H-bridge is connected to another port of the wireless power transmission module;

[0010] Wherein, the system includes a first working condition and a second working condition. The first working condition is that energy flows from port AE to port MN, and the second working condition is that energy flows from port MN to port AE.

[0011] Further, the first variable configuration I-shaped filter includes a first part, a second part, and a third part;

[0012] The first part includes a first inductor L1, a second inductor L2, and a first power switch S1. One end A of the first inductor L1 is connected to one end of port AE and is also connected to one end of the first power switch S1. The other end B of the first inductor L1 is connected to one end of the second inductor L2, and the other end C of the second inductor L2 is connected to the other end of the first power switch S1;

[0013] The second part includes a third inductor L3, a fourth inductor L4, and a second power switch S2. One end E of the third inductor L3 is connected to the other end of port AE and is also connected to one end of the second power switch S2. The other end F of the third inductor L3 is connected to one end of the fourth inductor L4, and the other end G of the fourth inductor L4 is connected to the other end of the second power switch S2;

[0014] The third part includes a third power switch S3 and a first capacitor C1 connected in series. One end of the third power switch S3 is connected to point B at the other end of the first inductor L1. The other end of the third power switch S3 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to point F at the other end of the third inductor L3.

[0015] The first H-bridge includes a seventh power switch Q1, an eighth power switch Q2, a ninth power switch Q3, and a tenth power switch Q4. One end of the seventh power switch Q1 and one end of the ninth power switch Q3 are connected together as point C. One end of the eighth power switch Q2 and one end of the tenth power switch Q4 are connected together as point G. The seventh power switch Q1 and the eighth power switch Q2 form a bridge arm with the midpoint being H, and the ninth power switch Q3 and the tenth power switch Q4 form another bridge arm with the midpoint being I. The port HI is connected to a port of the wireless power transfer module.

[0016] Further, the second variant I-shaped filter includes a fourth part, a fifth part, and a sixth part.

[0017] The fourth part includes a fifth inductor L5, a sixth inductor L6, and a fourth power switch S4. One end of the fifth inductor L5 at point U is connected to one end of the fourth power switch S4. The other end of the fifth inductor L5 at point V is connected to one end of the sixth inductor L6 and one end of the sixth power switch S6. The other end of the sixth inductor L6 at point M is connected to the other end of the fourth power switch S4.

[0018] The fifth part includes a seventh inductor L7, an eighth inductor L8, and a fifth power switch S5. One end of the seventh inductor L7 at point X is connected to the fifth power switch S5. The other end of the seventh inductor L7 is connected to the eighth inductor L8 and one end of the second capacitor C2. The fifth power switch S5 is connected to the other end of the eighth inductor L8 at point N, and MN is a port.

[0019] The sixth part includes a sixth power switch S6 and a second capacitor C2 connected in series. One end of the sixth power switch S6 is connected to point V, the connection point of the fifth inductor L5 and the sixth inductor L6. The other end of the sixth power switch S6 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to point Y, the connection point of the seventh inductor L7 and the eighth inductor L8.

[0020] The second H-bridge includes an eleventh power switch K1, a twelfth power switch K2, a thirteenth power switch K3, and a fourteenth power switch K4. One end of the eleventh power switch K1 is connected to one end of the thirteenth power switch K3 to form point U, and one end of the twelfth power switch K2 is connected to one end of the fourteenth power switch K4 to form point X. The eleventh power switch K1 and the twelfth power switch K2 form a bridge arm with the midpoint O, and the thirteenth power switch K3 and the fourteenth power switch K4 form another bridge arm with the midpoint P. The port OP is connected to another port of the wireless power transmission module.

[0021] Further, the first variable structure circuit unit has the capabilities of topology transformation and programmable circuit parameters. According to the different operating states of the first power switch S1, the second power switch S2, and the third power switch S3, the first variable structure circuit unit has 7 topological structures, specifically:

[0022] Variable circuit topology I - double inductor type of the first variable structure circuit unit: The first power switch S1, the second power switch S2, and the third power switch S3 are all always off. The first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 are all connected to the circuit, and the first capacitor C1 is not connected to the circuit.

[0023] Variable circuit topology II - I-shaped variable capacitor type of the first variable structure circuit unit: The first power switch S1 and the second power switch S2 are both always off, and the on-off of the third power switch S3 is controlled. Then, the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 are all connected to the circuit. The third power switch S3 and the first capacitor C1 are connected to the circuit in the form of a programmable capacitor Cd, that is, by controlling the duty cycle d3 of the third power switch S3, the series branch of the third power switch S3 and the first capacitor C1 is equivalent to a capacitor Cd with programmable capacitance, and Cd = d3 * C1. When the third power switch S3 is normally closed, d3 = 1 and Cd = C1.

[0024] Variable circuit topology III - short-circuit type of the first variable structure circuit unit: The first power switch S1 and the second power switch S2 are both closed. At this time, whether the third power switch S3 is closed or open has no effect on the circuit. Point A and point C are short-circuited by the first power switch S1, and point E and point G are short-circuited by the second power switch S2. At this time, the entire first variable configuration I-shaped filter is short-circuited and has no effect on the system circuit.

[0025] Variable circuit topology IV - upper inductor type of the first variable structure circuit unit: The first power switch S1 and the third power switch S3 are off, and the second power switch S2 is closed. Then, the first capacitor C1 is not connected to the circuit, the first inductor L1 and the second inductor L2 are connected to the circuit, and the third inductor L3 and the fourth inductor L4 are short-circuited by the second power switch S2.

[0026] Variable circuit topology Ⅴ - lower inductor type of the first variable structure circuit unit: When the first power switch S1 is closed and the second power switch S2 and the third power switch S3 are open, the first capacitor C1 is not connected to the circuit, the third inductor L3 and the fourth inductor L4 are connected to the circuit, and the first inductor L1 and the second inductor L2 are short - circuited by the second power switch S2;

[0027] Variable circuit topology Ⅵ - ⊥ - shaped filter of the first variable structure circuit unit: When the first power switch S1 and the third power switch S3 are closed and the second power switch S2 is open, since the first power switch S1 is closed, point A and point C are combined into one point. At this time, the first variable - configuration I - shaped filter becomes a ⊥ - shaped filter: The first inductor L1 and the second inductor L2 are in parallel and are respectively connected to point A, point C and point B. After the first inductor L1 and the second inductor L2 are in parallel, they are in series with the first capacitor C1. Both ends of the first capacitor C1 are respectively connected to point B and point F, and point F is simultaneously connected to one end of each of the third inductor L3 and the fourth inductor L4. The other end point of the third inductor L3 is point E, and the other end point of the fourth inductor L4 is point G;

[0028] Variable circuit topology Ⅶ - T - shaped filter of the first variable structure circuit unit: When the first power switch S1 is open and the second power switch S2 and the third power switch S3 are closed, since the second power switch S2 is closed, point E and point G are combined into one point. At this time, the first variable - configuration I - shaped filter becomes a T - shaped filter: The third inductor L3 and the fourth inductor L4 are in parallel and are respectively connected to point F and point E, point G. After the third inductor L3 and the fourth inductor L4 are in parallel, they are in series with the first capacitor C1. Both ends of the first capacitor C1 are respectively connected to point B and point F, and point B is simultaneously connected to one end of each of the first inductor L1 and the second inductor L2. The other end of the first inductor L1 is point A, and the other end of the second inductor L2 is point C.

[0029] Furthermore, the second variable structure circuit unit has the ability of topology transformation and programmable circuit parameters. According to the different working states of the fourth power switch S4, the fifth power switch S5 and the sixth power switch S6, the second variable structure circuit unit has 7 kinds of topological structures, specifically:

[0030] Variable circuit topology Ⅰ - double - inductor type of the second variable structure circuit unit: The fourth power switch S4, the fifth power switch S5 and the sixth power switch S6 are all always open, the fifth inductor L5, the sixth inductor L6, the seventh inductor L7 and the eighth inductor L8 are all connected to the circuit, and the second capacitor C2 is not connected to the circuit;

[0031] The variable circuit topology Ⅱ - I-shaped variable capacitor type of the second variable structure circuit unit: The fourth power switch S4 and the fifth power switch S5 are both always off, and the on-off of the sixth power switch S6 is controlled. Then, the fifth inductor L5, the sixth inductor L6, the seventh inductor L7, and the eighth inductor L8 are all connected to the circuit. The sixth power switch S6 and the second capacitor C2 are connected to the circuit in the form of a programmable capacitor Cv. That is, by controlling the duty cycle d6 of the sixth power switch S6, the series branch of the sixth power switch S6 and the second capacitor C2 is equivalent to a capacitor Cv with a programmable capacitance, and Cv = d6 * C2. When the sixth power switch S6 is normally closed, d6 = 1 and Cv = C2;

[0032] The variable circuit topology Ⅲ - short-circuit type of the second variable structure circuit unit: The fourth power switch S4 and the fifth power switch S5 are both closed. At this time, whether the sixth power switch S6 is closed or open has no effect on the circuit. The point U and the point M are short-circuited by the fourth power switch S4, and the point X and the point N are short-circuited by the fifth power switch S5. At this time, the entire second variable configuration I-shaped filter is short-circuited and has no effect on the system circuit;

[0033] The variable circuit topology Ⅳ - upper inductor type of the second variable structure circuit unit: The fifth power switch S5 and the sixth power switch S6 are off, and the fifth power switch S5 is closed. Then, the second capacitor C2 is not connected to the circuit, and the fifth inductor L5 and the sixth inductor L6 are connected to the circuit. The seventh inductor L7 and the eighth inductor L8 are short-circuited by the fifth power switch S5;

[0034] The variable circuit topology Ⅴ - lower inductor type of the second variable structure circuit unit: The fourth power switch S4 is closed, and the fifth power switch S5 and the sixth power switch S6 are off. Then, the second capacitor C2 is not connected to the circuit, and the seventh inductor L7 and the eighth inductor L8 are connected to the circuit. The fifth inductor L5 and the sixth inductor L6 are short-circuited by the fourth power switch S4;

[0035] The variable circuit topology Ⅵ - ⊥-shaped filter of the second variable structure circuit unit: The fourth power switch S4 and the sixth power switch S6 are closed, and the fifth power switch S5 is off. Since the fourth power switch S4 is closed, the point U and the point M are combined into one point. At this time, the second variable configuration I-shaped filter becomes a ⊥-shaped filter: The fifth inductor L5 and the sixth inductor L6 are in parallel and are respectively connected to the point U, the point M, and the point Y. After the fifth inductor L5 and the sixth inductor L6 are in parallel, they are connected in series with the second capacitor C2. The two ends of the second capacitor C2 are respectively connected to the point V and the point Y. The point Y is simultaneously connected to one end of each of the seventh inductor L7 and the eighth inductor L8. The other end point of the seventh inductor L7 is the point X, and the other end point of the eighth inductor L8 is N;

[0036] Variable circuit topology Ⅶ - T-shaped filter of the second variable structure circuit unit: The fourth power switch S4 is disconnected, and the fifth power switch S5 and the sixth power switch S6 are closed. Since the fifth power switch S5 is closed, point X and point N are combined into one point. At this time, the second variable configuration I-shaped filter becomes a T-shaped filter: The seventh inductor L7 and the eighth inductor L8 are in parallel and are respectively connected to point Y and point X, point N. After the seventh inductor L7 and the eighth inductor L8 are in parallel, they are connected in series with the second capacitor C2. The two ends of the second capacitor C2 are respectively connected to point Y and point V. Point V is simultaneously connected to one end of each of the fifth inductor L5 and the sixth inductor L6. The other end of the fifth inductor L5 is point U, and the other end of the sixth inductor L6 is point M.

[0037] Further, when the energy flows from port AE to port MN, the first variable structure circuit unit is the input side:

[0038] When the variable circuit topology of the first variable structure circuit unit is I - dual inductor type, it is a boost topology and is suitable for boost application scenarios;

[0039] The variable circuit topology of the first variable structure circuit unit is II - I-shaped variable capacitor type, which is suitable for application scenarios where there are a large number of harmonics at the input of port AE. And by controlling the duty cycle d3 of the third power switch S3, the series branch of the power switch S3 and the first capacitor C1 is equivalent to a capacitor Cd with programmable capacitance, Cd = d3 * C1, to adapt to different harmonic working conditions;

[0040] The variable circuit topology of the first variable structure circuit unit is III - short - circuit type, which is a buck topology and is suitable for buck application scenarios;

[0041] The variable circuit topology of the first variable structure circuit unit is IV - upper inductor type, which is a boost topology and is suitable for boost application scenarios. Compared with the circuit topology I - dual inductor type, the inductance is smaller;

[0042] The variable circuit topology of the first variable structure circuit unit is V - lower inductor type, which is suitable for boost application scenarios. Compared with the circuit topology I - dual inductor type, the inductance is smaller;

[0043] The variable circuit topology of the first variable structure circuit unit is VI - ⊥ - shaped filter, which is suitable for application scenarios where there are a large number of harmonics at the input of port AE. Different from the circuit topology II - I-shaped variable capacitor type, the capacitance in the circuit topology VI - ⊥ - shaped filter is not adjustable;

[0044] The variable circuit topology of the first variable structure circuit unit is VII - T-shaped filter, which is suitable for application scenarios where there are a large number of harmonics at the input of port AE. Different from the circuit topology II - I-shaped variable capacitor type, the capacitance in the circuit topology VI - T-shaped filter is not adjustable.

[0045] When the energy flows from port AE to port MN, the second variable structure circuit unit is the output side. At this time, all types of variable circuit topologies of the second variable structure circuit unit are buck circuit topologies:

[0046] The variable circuit topology I - double - inductor type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter only acts as a filtering inductor;

[0047] The variable circuit topology II - I - shaped variable - capacitor type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is an I - shaped filter, and the equivalent capacitance Cv is programmable by controlling the duty cycle d6 of the sixth power switch S6 to adapt to different harmonic conditions and dynamic impedance matching;

[0048] The variable circuit topology III - short - circuit type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is only equivalent to a wire;

[0049] The variable circuit topology IV - upper - inductor type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is only equivalent to a filtering inductor and has a smaller inductance value compared with the variable circuit topology I - double - inductor type of the second variable - structure circuit unit;

[0050] The variable circuit topology V - lower - inductor type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is only equivalent to a filtering inductor and has a smaller inductance value compared with the variable circuit topology I - double - inductor type of the second variable - structure circuit unit;

[0051] The variable circuit topology VI - ⊥ - shaped filter of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is equivalent to a ⊥ - shaped filter and the capacitance size remains unchanged;

[0052] The variable circuit topology VII - T - shaped filter of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is equivalent to a T - shaped filter and the capacitance size remains unchanged.

[0053] Furthermore, when the energy flows from the MN - side port to the AE - side port, the second variable - structure circuit unit is the input side:

[0054] When the variable circuit topology of the second variable - structure circuit unit is of the I - double - inductor type, it is a boost topology, suitable for boost application scenarios;

[0055] When the variable circuit topology of the second variable - structure circuit unit is of the II - I - shaped variable - capacitor type, it is suitable for application scenarios where there are a large number of harmonics at the MN - port input. And by controlling the duty cycle d6 of the sixth power switch S6, the series branch of the sixth power switch S6 and the second capacitor C2 is equivalent to a capacitor Cv with programmable capacitance size, Cv = d6 * C2, to adapt to different harmonic conditions;

[0056] When the variable circuit topology of the second variable - structure circuit unit is of the III - short - circuit type, it is a buck topology, suitable for buck application scenarios;

[0057] The variable circuit topology Ⅳ - upper inductor type of the second variable structure circuit unit is a boost topology, suitable for boost application scenarios, and has a smaller inductance compared with the variable circuit topology Ⅰ - dual inductor type;

[0058] The variable circuit topology Ⅴ - lower inductor type of the second variable structure circuit unit is suitable for boost application scenarios, and has a smaller inductance compared with the variable circuit topology Ⅰ - dual inductor type;

[0059] The variable circuit topology Ⅵ - ⊥ - shaped filter of the second variable structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the port AE input. Different from the circuit topology Ⅱ - I - shaped variable capacitor type, the capacitance in the variable circuit topology Ⅵ - ⊥ - shaped filter is not adjustable;

[0060] The variable circuit topology Ⅶ - T - shaped filter of the second variable structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the port AE input. Different from the variable circuit topology Ⅱ - I - shaped variable capacitor type, the capacitance in the variable circuit topology Ⅵ - T - shaped filter is not adjustable.

[0061] When the energy flows from the port MN side to the port AE side, the first variable structure circuit unit is the output side. At this time, all variable circuit topologies of the first variable structure circuit unit are buck circuit topologies:

[0062] The variable circuit topology Ⅰ - dual inductor type of the first variable structure circuit unit is a boost topology, suitable for boost application scenarios;

[0063] The variable circuit topology Ⅱ - I - shaped variable capacitor type of the first variable structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the port AE input. And by controlling the duty cycle d3 of the third power switch S3, the series branch of the third power switch S3 and the first capacitor C1 is equivalent to a capacitor Cd with programmable capacitance, Cd = d3 * C1, to adapt to different harmonic working conditions and dynamic impedance matching;

[0064] The variable circuit topology Ⅲ - short - circuit type of the first variable structure circuit unit is a buck topology, suitable for buck application scenarios;

[0065] The variable circuit topology Ⅳ - upper inductor type of the first variable structure circuit unit is a boost topology, suitable for boost application scenarios, and has a smaller inductance compared with the variable circuit topology Ⅰ - dual inductor type;

[0066] The variable circuit topology Ⅴ - lower inductor type of the first variable structure circuit unit is suitable for boost application scenarios, and has a smaller inductance compared with the variable circuit topology Ⅰ - dual inductor type;

[0067] The variable circuit topology Ⅵ - ⊥ - shaped filter of the first variable structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the port MN input. Different from the variable circuit topology Ⅱ - I - shaped variable capacitor type, the capacitance in the variable circuit topology Ⅵ - ⊥ - shaped filter is not adjustable;

[0068] The variable circuit topology Ⅶ-T filter of the first variable structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the port AE input. Different from the variable circuit topology Ⅱ-I-shaped variable capacitance type, the capacitance size in the variable circuit topology Ⅵ-T filter is not adjustable. Description of the Drawings

[0069] Figure 1 This is the structural block diagram of the bidirectional wireless power transmission circuit system based on variable structure of the present invention;

[0070] Figure 2 This is the circuit topology diagram of the first variable structure circuit unit;

[0071] Figure 3 This is the circuit topology diagram of the second variable structure circuit unit;

[0072] Figure 4 This is the variable circuit topology Ⅰ-double inductor type of the first variable structure circuit unit;

[0073] Figure 5 This is the variable circuit topology Ⅱ-I-shaped variable capacitance type of the first variable structure circuit unit;

[0074] Figure 6 This is the variable circuit topology Ⅲ-short circuit type of the first variable structure circuit unit;

[0075] Figure 7 This is the variable circuit topology Ⅳ-upper inductor type of the first variable structure circuit unit;

[0076] Figure 8 This is the variable circuit topology Ⅴ-lower inductor type of the first variable structure circuit unit;

[0077] Figure 9 This is the variable circuit topology Ⅵ-⊥-shaped filter of the first variable structure circuit unit;

[0078] Figure 10 This is the variable circuit topology Ⅶ-T filter of the first variable structure circuit unit;

[0079] Figure 11 This is the variable circuit topology Ⅰ-double inductor type of the second variable structure circuit unit;

[0080] Figure 12 This is the variable circuit topology Ⅱ-I-shaped variable capacitance type of the second variable structure circuit unit;

[0081] Figure 13 This is the variable circuit topology Ⅲ-short circuit type of the second variable structure circuit unit;

[0082] Figure 14 This is the variable circuit topology Ⅳ-upper inductor type of the second variable structure circuit unit;

[0083] Figure 15It is the variable circuit topology Ⅴ - lower inductor type of the second variable structure circuit unit;

[0084] Figure 16 It is the variable circuit topology Ⅵ - ⊥ - shaped filter of the second variable structure circuit unit;

[0085] Figure 17 It is the variable circuit topology Ⅶ - T - shaped filter of the second variable structure circuit unit;

[0086] Figure 18 It is a practical circuit topology diagram of the bidirectional wireless power transmission circuit system based on variable structure of the present invention. Detailed implementation manners

[0087] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0088] Figure 1 It is a structure block diagram of the bidirectional wireless power transmission circuit system based on variable structure of the present invention.

[0089] The bidirectional wireless power transmission circuit system based on variable structure of the present invention is composed of a variable structure circuit 1 unit, a wireless power transmission module, and a variable structure circuit 2 unit connected in series; Port 1 is connected to the AE side of the variable structure circuit 1 unit, the other side HI of the variable structure circuit 1 unit is connected in series to one side of the wireless power transmission module, the other side OP of the wireless power transmission module is connected in series to one side of the variable structure circuit 2 unit, and the other side MN of the variable structure circuit 2 unit is connected to Port 2.

[0090] Figure 2 It is a circuit topology diagram of the variable structure circuit 1 unit.

[0091] The variable structure circuit 1 unit is composed of a No. 1 variable configuration I - shaped filter and a No. 1 H - bridge connected in series; Port 1 of the No. 1 variable configuration I - shaped filter is a port of the system circuit, the other port CG of the No. 1 variable configuration I - shaped filter is connected to the No. 1 H - bridge, and the other port HI of the No. 1 H - bridge is the other port of the variable structure circuit 2 unit and is connected to a port of the wireless power transmission module;

[0092] The upper "-" part of the No. 1 variable configuration I - shaped filter is composed of L1, L2 and S1, where one end A of L1 is connected to one end of Port 1 and is connected to one end of S1, the other end B of L1 is connected to one end of L2, and the other end C of L2 is connected to the other end of S1;

[0093] The lower "one" part of the No. 1 variable-configuration I-shaped filter is composed of L3, L4 and S2. One end point E of L3 is connected to the other end of port AE and is also connected to one end of S2. The other end point F of L3 is connected to one end of L4, and the other end G point of L4 is connected to the other end of S2.

[0094] The middle "1" part of the No. 1 variable-configuration I-shaped filter is composed of S3 and C1 in series. One end of S3 is connected to point B, and one end of C1 is connected to point F.

[0095] One end of S3 is connected to the connection point B of L1 and L2, the other end of S3 is connected to one end of C1, and the other end of C1 is connected to the connection point F of L3 and L4.

[0096] The No. 1 H-bridge is composed of Q1 - Q4. One end of Q1 is connected to one end of Q3 as point C, and one end of Q2 is connected to one end of Q4 as point G. Q1 and Q2 form one arm with the midpoint being H, and Q3 and Q4 form the other arm with the midpoint being I. The port HI is connected to one end of the wireless power transmission module.

[0097] Figure 3 It is the circuit topology diagram of the variable-structure circuit 2 unit.

[0098] The variable-structure circuit 2 unit is composed of a No. 2 H-bridge and a No. 2 variable-configuration I-shaped filter in series. The port OP of the No. 2 H-bridge is a port of the variable-structure circuit 2 unit and is connected to the other port of the wireless power transmission module. The port MN of the No. 2 variable-configuration I-shaped filter is the other port of the variable-structure circuit 2 unit and is also the other port of the system circuit.

[0099] The No. 2 H-bridge is composed of K1 - K4. One end of K1 is connected to one end of K3 as point U, and one end of K2 is connected to one end of K4 as point X. K1 and K2 form one arm with the midpoint being O, and K3 and K4 form the other arm with the midpoint being P. The port OP is connected to the other end of the wireless power transmission module.

[0100] The upper "one" part of the No. 2 variable-configuration I-shaped filter is composed of L5, L6 and S4. One end U of L5 is connected to one end of S4, the other end V of L5 is connected to one end of L6 and one end of S6, and the other end M of L6 is connected to the other end of S4.

[0101] The lower "one" part of the No. 2 variable-configuration I-shaped filter is composed of L7, L8 and S5. One end X of L7 is connected to S5, the other end of L7 is connected to L8 and one end of C2, and S5 is connected to the other end M of L8. MN is the other port.

[0102] The middle "I" part of the No. 2 variable-configuration I-shaped filter is composed of S6 and C2 in series, one end of S6 is connected to the connection point V of L5 and L6, the other end of S6 is connected to one end of C2, and the other end of C2 is connected to the connection point Y of L7 and L8.

[0103] By controlling S1, S2, and S3, the variable structure circuit 1 unit can change into 7 circuit topology configurations. Figures 4 - 10 Describe in detail.

[0104] Figure 4 It is the variable circuit topology Ⅰ-dual inductor type of the variable structure circuit 1 unit.

[0105] Variable circuit topology of variable structure circuit 1 unit Ⅰ-dual inductor type: S1, S2, S3 are always disconnected, L1, L2, L3, L4 are all connected to the circuit, and C1 is not connected to the circuit;

[0106] Figure 5 It is the variable circuit topology II of the variable structure circuit 1 unit - I-shaped variable capacitor type.

[0107] Variable circuit topology II of variable structure circuit 1 unit - I-shaped variable capacitor type: S1 and S2 are always disconnected and S3 is controlled to be on and off, then L1, L2, L3, and L4 are all connected to the circuit, and S3 and C1 are connected to the circuit in the form of programmable capacitor Cd, that is, by controlling the duty cycle d3 of S3, the series branch of S3 and capacitor C1 is equivalent to a capacitor Cd with programmable capacitance, and Cd = d3*C1, wherein when S3 is normally closed, d3 = 1, Cd = C1;

[0108] Figure 6 It is the variable circuit topology III-short-circuit type of the variable structure circuit 1 unit.

[0109] Variable circuit topology III of variable structure circuit 1 unit - short-circuit type: S1 and S2 are both closed. At this time, whether S3 is closed or open, it has no effect on the circuit. Point A and point C are short-circuited by S1, and point E and point G are short-circuited by S2. At this time, the entire variable structure I-shaped filter No. 1 is short-circuited and has no effect on the system circuit;

[0110] Figure 7 It is the variable circuit topology IV-upper inductance type of the variable structure circuit 1 unit.

[0111] Variable circuit topology IV of variable structure circuit 1 unit - upper inductance type: S1 and S3 are disconnected, S2 is closed, then C1 is not connected to the circuit, L1 and L2 are connected to the circuit, and L3 and L4 are short-circuited by S2.

[0112] Figure 8 It is a variable circuit topology V-lower inductor type of variable structure circuit 1 unit.

[0113] Variable circuit topology Ⅴ - lower inductor type of the variable structure circuit 1 unit: When S1 is closed and S2, S3 are open, C1 is not connected to the circuit, L3 and L4 are connected to the circuit, and L1 and L2 are short - circuited by the power switch S2.

[0114] Figure 9 It is the variable circuit topology Ⅵ - ⊥ - shaped filter of the variable structure circuit 1 unit.

[0115] Figure 9 In (a), it is the circuit diagram of the variable circuit topology Ⅵ - ⊥ - shaped filter of the variable structure circuit 1 unit;

[0116] Variable circuit topology Ⅵ - ⊥ - shaped filter of the variable structure circuit 1 unit: When S1 and S3 are closed and S2 is open, since S1 is closed, A and C are combined into one point. At this time, the No. 1 variable - configuration I - shaped filter becomes a ⊥ - shaped filter;

[0117] Figure 9 In (b), it is the equivalent circuit diagram of the variable circuit topology Ⅵ - ⊥ - shaped filter of the variable structure circuit 1 unit;

[0118] When S1 is closed, A and C are combined into one point. When S3 is closed, the capacitor C1 is directly connected between point B and point C. When S2 is open, the circuit branch of S2 is removed; L1 and L2 are in parallel and are respectively connected between point A, point C and point B. After L1 and L2 are in parallel, they are in series with the capacitor C1. The two ends of C1 are respectively connected between point B and point F, and point F is simultaneously connected to one end of L3 and L4 respectively. The other end of L3 is point E, and the other end of L4 is point G.

[0119] Figure 10 It is the variable circuit topology Ⅶ - T - shaped filter of the variable structure circuit 1 unit.

[0120] Figure 10 In (a), it is the circuit diagram of the variable circuit topology Ⅶ - T - shaped filter of the variable structure circuit 1 unit;

[0121] Variable circuit topology Ⅶ - T - shaped filter of the variable structure circuit 1 unit: When S1 is open and S2, S3 are closed, since S2 is closed, E and G are combined into one point. At this time, the No. 1 variable - configuration I - shaped filter becomes a T - shaped filter:

[0122] Figure 10 In (b), it is the equivalent circuit diagram of the variable circuit topology Ⅶ - T - shaped filter of the variable structure circuit 1 unit;

[0123] If S1 is disconnected, the circuit branch of S1 is removed. If S2 is closed, points E and G become one point. If S3 is closed, capacitor C1 is directly connected between points B and C; inductors L3 and L4 are in parallel and are respectively connected to point F and points E and G. After inductors L3 and L4 are in parallel, they are in series with capacitor C1. Both ends of C1 are respectively connected to point B and point F. Point B is simultaneously connected to one end of each of inductors L1 and L2. The other end of L1 is point A, and the other end of L2 is point C.

[0124] By controlling S4, S5, and S6, the variable structure circuit 2 unit can vary into 7 circuit topologies, which will be described in detail Figures 11 - 17 sequentially.

[0125] Figure 11 It is the variable circuit topology Ⅰ - double - inductor type of the variable structure circuit 2 unit.

[0126] Variable circuit topology Ⅰ - double - inductor type of the variable structure circuit 2 unit: S4, S5, and S6 are all continuously disconnected. L5, L6, L7, and L8 are all connected to the circuit, while C2 is not connected to the circuit;

[0127] Figure 12 It is the variable circuit topology Ⅱ - I - shaped variable capacitor type of the variable structure circuit 2 unit.

[0128] Variable circuit topology Ⅱ - I - shaped variable capacitor type of the variable structure circuit 2 unit: S4 and S5 are both continuously disconnected while controlling the on - off of S6. Then L1, L2, L3, and L4 are all connected to the circuit. S6 and C2 are connected to the circuit in the form of a programmable capacitor Cv. That is, by the duty cycle d6 of S6, the series branch of S6 and capacitor C2 is equivalent to a capacitor Cv with programmable capacitance, and Cv = d6 * C2. When S6 is normally closed, d6 = 1 and Cv = C2;

[0129] Figure 13 It is the variable circuit topology Ⅲ - short - circuit type of the variable structure circuit 2 unit.

[0130] Variable circuit topology Ⅲ - short - circuit type of the variable structure circuit 2 unit: S4 and S5 are both closed. At this time, whether S6 is closed or not has no effect on the circuit. Point U and point M are short - circuited by S4, and point X and point N are short - circuited by S5. At this time, the entire No. 2 variable - configuration I - shaped filter is short - circuited and has no effect on the system circuit;

[0131] Figure 14 It is the variable circuit topology Ⅳ - upper - inductor type of the variable structure circuit 2 unit.

[0132] Variable circuit topology Ⅳ - upper - inductor type of the variable structure circuit 2 unit: S5 and S6 are disconnected. If S5 is closed, then C2 is not connected to the circuit, L5 and L6 are connected to the circuit, and L7 and L8 are short - circuited by S5;

[0133] Figure 15It is the variable circuit topology Ⅴ - lower inductor type of the variable structure circuit 2 unit.

[0134] Variable circuit topology Ⅴ - lower inductor type of the variable structure circuit 2 unit: When S4 is closed and S5, S6 are open, C2 is not connected to the circuit, L7, L8 are connected to the circuit, and L5, L6 are short - circuited by S4.

[0135] Figure 16 It is the variable circuit topology Ⅵ - ⊥ - shaped filter of the variable structure circuit 2 unit.

[0136] Figure 16 -(a) is the circuit diagram of the circuit topology Ⅵ - ⊥ - shaped filter;

[0137] Variable circuit topology Ⅵ - ⊥ - shaped filter of the variable structure circuit 2 unit: When S4 and S6 are closed and S5 is open, since S4 is closed, U and M are combined into one point. At this time, the No. 2 variable configuration I - shaped filter becomes a ⊥ - shaped filter;

[0138] Figure 16 -(b) is the equivalent circuit diagram of the circuit topology Ⅵ - ⊥ - shaped filter;

[0139] When S4 is closed, U and M are combined into one point. When S6 is closed, the capacitor C2 is directly connected between V and Y. When S5 is open, the circuit branch of S5 is removed; L5 and L6 are in parallel and are respectively connected to the points U, M and V. After L5 and L6 are in parallel, they are in series with the capacitor C2. The two ends of C2 are respectively connected to the points V and Y. The point V is simultaneously connected to one end of each of the inductors L5 and L6. The other end point of L5 is the point U, and the other end point of L6 is M.

[0140] Figure 17 It is the variable circuit topology Ⅶ - T - shaped filter of the variable structure circuit 2 unit.

[0141] Figure 17 In (a), it is the circuit diagram of the variable circuit topology Ⅶ - T - shaped filter of the variable structure circuit 2 unit;

[0142] Variable circuit topology Ⅶ - T - shaped filter of the variable structure circuit 2 unit: When S4 is open and S5, S6 are closed, since S5 is closed, X and N are combined into one point. At this time, the No. 2 variable configuration I - shaped filter becomes a T - shaped filter:

[0143] Figure 17 - In (b), it is the equivalent circuit diagram of the variable circuit topology Ⅶ - T - shaped filter of the variable structure circuit 2 unit;

[0144] If S4 is disconnected, the circuit branch of S4 is removed. If S5 is closed, X and N are combined into one point. If S6 is closed, capacitor C2 is directly connected between points V and Y. L7 and L8 are in parallel and are respectively connected to points X, N and Y. After L7 and L8 are in parallel, they are connected in series with capacitor C2. The two ends of C2 are respectively connected to point Y and point V. Point V is simultaneously connected to one end of each of L5 and L6. The other end of L5 is point U, and the other end of L6 is point M.

[0145] Figure 18 This is the complete main circuit topology diagram of the two-way wireless power transmission circuit system based on variable structure of the present invention.

[0146] The main circuit of the two-way wireless power transmission circuit system based on variable structure of the present invention is composed of a variable structure circuit 1 unit, a wireless power transmission module, and a variable structure circuit 2 unit connected in series. Port 1 is connected to the AE side of the variable structure circuit 1 unit. The other side HI of the variable structure circuit 1 unit is connected in series with one side of the wireless power transmission module. The other side OP of the wireless power transmission module is connected in series with one side of the variable structure circuit 2 unit. The other side MN of the variable structure circuit 2 unit is connected to port 2.

[0147] The variable structure circuit 1 unit is composed of a No. 1 variable configuration I-shaped filter and a No. 1 H-bridge connected in series. The AE port of the No. 1 variable configuration I-shaped filter is a port of the system circuit. The other port CG of the No. 1 variable configuration I-shaped filter is connected to the No. 1 H-bridge. The other port HI of the No. 1 H-bridge is the other port of the variable structure circuit 2 unit and is connected to a port of the wireless power transmission module.

[0148] The variable structure circuit 2 unit is composed of a No. 2 H-bridge and a No. 2 variable configuration I-shaped filter connected in series. The OP port of the No. 2 H-bridge is a port of the variable structure circuit 2 unit and is connected to the other port of the wireless power transmission module. The MN port of the No. 2 variable configuration I-shaped filter is the other port of the variable structure circuit 2 unit and is simultaneously the other port of the system circuit.

[0149] Both the variable structure circuit 1 unit and the variable structure circuit 2 unit have the ability of topology transformation and the ability of programmable circuit parameters.

[0150] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A two-way wireless power transmission circuit system based on variable structure, characterized in that Comprising: A first variable structure circuit unit, a wireless power transmission module, and a second variable structure circuit unit connected in series in sequence. One port AE of the first variable structure circuit unit is connected to one port of the system circuit. Another port HI of the first variable structure circuit unit is connected to one port of the wireless power transmission module. Another port of the wireless power transmission module is connected to another port OP of the second variable structure circuit unit. One port MN of the second variable structure circuit unit is connected to one port of the system circuit; The first variable structure circuit unit includes a first variable configuration I-shaped filter and a first H-bridge connected in series. One port AE of the first variable configuration I-shaped filter is connected to one port of the system circuit. Another port CG of the first variable configuration I-shaped filter is connected to the first H-bridge. Another port HI of the first H-bridge is connected to one port of the wireless power transmission module; The second variable structure circuit unit includes a second variable configuration I-shaped filter and a second H-bridge connected in series. One port MN of the second variable configuration I-shaped filter is connected to one port of the system circuit. Another port UX of the second variable configuration I-shaped filter is connected to the second H-bridge. Another port OP of the second H-bridge is connected to another port of the wireless power transmission module; Wherein, the system includes a first working condition and a second working condition. The first working condition is that energy flows from port AE to port MN. The second working condition is that energy flows from port MN to port AE.

2. The bidirectional wireless power transmission circuit system based on variable structure according to claim 1, wherein The first variable configuration I-shaped filter includes a first part, a second part, and a third part; The first part includes a first inductor L1, a second inductor L2, and a first power switch S1. One end A of the first inductor L1 is connected to one end of port AE and is connected to one end of the first power switch S1. The other end B of the first inductor L1 is connected to one end of the second inductor L2. The other end C of the second inductor L2 is connected to the other end of the first power switch S1; The second part includes a third inductor L3, a fourth inductor L4, and a second power switch S2. One end E of the third inductor L3 is connected to the other end of port AE and is connected to one end of the second power switch S2. The other end F of the third inductor L3 is connected to one end of the fourth inductor L4. The other end G of the fourth inductor L4 is connected to the other end of the second power switch S2; The third part includes a third power switch S3 and a first capacitor C1 connected in series. One end of the third power switch S3 is connected to the other end B of the first inductor L1. The other end of the third power switch S3 is connected to one end of the first capacitor C1. The other end of the first capacitor C1 is connected to the other end F of the third inductor L3; The first H-bridge includes a seventh power switch Q1, an eighth power switch Q2, a ninth power switch Q3, and a tenth power switch Q4. One end of the seventh power switch Q1 is connected to one end of the ninth power switch Q3 to form point C, and one end of the eighth power switch Q2 is connected to one end of the tenth power switch Q4 to form point G. The seventh power switch Q1 and the eighth power switch Q2 form a bridge arm with the midpoint being H, and the ninth power switch Q3 and the tenth power switch Q4 form another bridge arm with the midpoint being I. The port HI is connected to one port of the wireless power transmission module.

3. A bidirectional wireless power transmission circuit system based on variable structure according to claim 1, characterized in that The second variable-configuration I-shaped filter includes a fourth part, a fifth part, and a sixth part; The fourth part includes a fifth inductor L5, a sixth inductor L6, and a fourth power switch S4. One end U of the fifth inductor L5 is connected to one end of the fourth power switch S4. The other end V of the fifth inductor L5 is connected to one end of the sixth inductor L6 and one end of the sixth power switch S6. The other end M of the sixth inductor L6 is connected to the other end of the fourth power switch S4; The fifth part includes a seventh inductor L7, an eighth inductor L8, and a fifth power switch S5. One end X of the seventh inductor L7 is connected to the fifth power switch S5. The other end of the seventh inductor L7 is connected to the eighth inductor L8 and one end of the second capacitor C2. The fifth power switch S5 is connected to the other end N of the eighth inductor L8, and MN is a port; The sixth part includes a series connection of the sixth power switch S6 and the second capacitor C2. One end of the sixth power switch S6 is connected to the connection point V of the fifth inductor L5 and the sixth inductor L6. The other end of the sixth power switch S6 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the connection point Y of the seventh inductor L7 and the eighth inductor L8; The second H-bridge includes an eleventh power switch K1, a twelfth power switch K2, a thirteenth power switch K3, and a fourteenth power switch K4. One end of the eleventh power switch K1 is connected to one end of the thirteenth power switch K3 to form point U, and one end of the twelfth power switch K2 is connected to one end of the fourteenth power switch K4 to form point X. The eleventh power switch K1 and the twelfth power switch K2 form a bridge arm with the midpoint being O, and the thirteenth power switch K3 and the fourteenth power switch K4 form another bridge arm with the midpoint being P. The port OP is connected to the other port of the wireless power transmission module.

4. A bidirectional wireless power transmission circuit system based on variable structure according to claim 2, characterized in that The first variable-structure circuit unit has the capabilities of topology transformation and programmable circuit parameters. According to the different operating states of the first power switch S1, the second power switch S2, and the third power switch S3, the first variable-structure circuit unit has 7 kinds of topological structures, specifically: Variable circuit topology I - double-inductor type of the first variable-structure circuit unit: The first power switch S1, the second power switch S2, and the third power switch S3 are all continuously disconnected. The first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 are all connected to the circuit, and the first capacitor C1 is not connected to the circuit; The variable circuit topology Ⅱ - I-shaped variable capacitance type of the first variable structure circuit unit: The first power switch S1 and the second power switch S2 are always off, and the on / off of the third power switch S3 is controlled. Then, the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 are all connected to the circuit. The third power switch S3 and the first capacitor C1 are connected to the circuit in the form of a programmable capacitor Cd. That is, by controlling the duty cycle d3 of the third power switch S3, the series branch of the third power switch S3 and the first capacitor C1 is equivalent to a capacitor Cd with a programmable capacitance, and Cd = d3 * C1. When the third power switch S3 is normally closed, d3 = 1 and Cd = C1; The variable circuit topology Ⅲ - short-circuit type of the first variable structure circuit unit: The first power switch S1 and the second power switch S2 are both closed. At this time, whether the third power switch S3 is closed or open has no effect on the circuit. Point A and point C are short-circuited by the first power switch S1, and point E and point G are short-circuited by the second power switch S2. At this time, the entire first variable configuration I-shaped filter is short-circuited and has no effect on the system circuit; The variable circuit topology Ⅳ - upper inductor type of the first variable structure circuit unit: The first power switch S1 and the third power switch S3 are off, and the second power switch S2 is on. Then, the first capacitor C1 is not connected to the circuit, the first inductor L1 and the second inductor L2 are connected to the circuit, and the third inductor L3 and the fourth inductor L4 are short-circuited by the second power switch S2; The variable circuit topology Ⅴ - lower inductor type of the first variable structure circuit unit: The first power switch S1 is on, and the second power switch S2 and the third power switch S3 are off. Then, the first capacitor C1 is not connected to the circuit, the third inductor L3 and the fourth inductor L4 are connected to the circuit, and the first inductor L1 and the second inductor L2 are short-circuited by the second power switch S2; The variable circuit topology Ⅵ - ⊥-shaped filter of the first variable structure circuit unit: The first power switch S1 and the third power switch S3 are on, and the second power switch S2 is off. Since the first power switch S1 is on, point A and point C are combined into one point. At this time, the first variable configuration I-shaped filter becomes a ⊥-shaped filter: The first inductor L1 and the second inductor L2 are in parallel and are respectively connected to point A, point C, and point B. After the first inductor L1 and the second inductor L2 are in parallel, they are connected in series with the first capacitor C1. The two ends of the first capacitor C1 are respectively connected to point B and point F. Point F is simultaneously connected to one end of each of the third inductor L3 and the fourth inductor L4. The other end point of the third inductor L3 is point E, and the other end point of the fourth inductor L4 is point G; Variable circuit topology Ⅶ-T filter of the first variable structure circuit unit: The first power switch S1 is turned off, and the second power switch S2 and the third power switch S3 are turned on. Since the second power switch S2 is turned on, point E and point G are combined into one point. At this time, the first variable configuration I-shaped filter becomes a T filter: The third inductor L3 and the fourth inductor L4 are connected in parallel and are respectively connected to point F and point E, point G. After the third inductor L3 and the fourth inductor L4 are connected in parallel, they are connected in series with the first capacitor C1. The two ends of the first capacitor C1 are respectively connected to point B and point F. Point B is simultaneously connected to one end of the first inductor L1 and the second inductor L2. The other end of the first inductor L1 is point A, and the other end of the second inductor L2 is point C.

5. A bidirectional wireless power transmission circuit system based on variable structure according to claim 3, characterized in that, The second variable structure circuit unit has the ability of topology transformation and programmable circuit parameters. According to the different working states of the fourth power switch S4, the fifth power switch S5, and the sixth power switch S6, the second variable structure circuit unit has 7 kinds of topological structures, specifically: Variable circuit topology Ⅰ-double inductor type of the second variable structure circuit unit: The fourth power switch S4, the fifth power switch S5, and the sixth power switch S6 are all always turned off. The fifth inductor L5, the sixth inductor L6, the seventh inductor L7, and the eighth inductor L8 are all connected to the circuit, and the second capacitor C2 is not connected to the circuit; Variable circuit topology Ⅱ-I-shaped variable capacitor type of the second variable structure circuit unit: The fourth power switch S4 and the fifth power switch S5 are both always turned off, and the on-off of the sixth power switch S6 is controlled. Then the fifth inductor L5, the sixth inductor L6, the seventh inductor L7, and the eighth inductor L8 are all connected to the circuit. The sixth power switch S6 and the second capacitor C2 are connected to the circuit in the form of a programmable capacitor Cv, that is, by controlling the duty cycle d6 of the sixth power switch S6, the series branch of the sixth power switch S6 and the second capacitor C2 is equivalent to a capacitor Cv with programmable capacitance, and Cv = d6 * C2. When the sixth power switch S6 is normally closed, d6 = 1, Cv = C2; Variable circuit topology Ⅲ-short-circuit type of the second variable structure circuit unit: The fourth power switch S4 and the fifth power switch S5 are both turned on. At this time, whether the sixth power switch S6 is turned on or off has no effect on the circuit. Point U and point M are short-circuited by the fourth power switch S4, and point X and point N are short-circuited by the fifth power switch S5. At this time, the entire second variable configuration I-shaped filter is short-circuited and has no effect on the system circuit; Variable circuit topology Ⅳ-upper inductor type of the second variable structure circuit unit: The fifth power switch S5 and the sixth power switch S6 are turned off, and the fifth power switch S5 is turned on. Then the second capacitor C2 is not connected to the circuit, the fifth inductor L5 and the sixth inductor L6 are connected to the circuit, and the seventh inductor L7 and the eighth inductor L8 are short-circuited by the fifth power switch S5; Variable circuit topology Ⅴ-lower inductor type of the second variable structure circuit unit: The fourth power switch S4 is turned on, and the fifth power switch S5 and the sixth power switch S6 are turned off. Then the second capacitor C2 is not connected to the circuit, the seventh inductor L7 and the eighth inductor L8 are connected to the circuit, and the fifth inductor L5 and the sixth inductor L6 are short-circuited by the fourth power switch S4; Variable circuit topology Ⅵ - ⊥ - shaped filter of the second variable - structure circuit unit: The fourth power switch S4 and the sixth power switch S6 are closed, and the fifth power switch S5 is open. Since the fourth power switch S4 is closed, point U and point M are combined into one point. At this time, the second variable - configuration I - shaped filter becomes a ⊥ - shaped filter: The fifth inductor L5 and the sixth inductor L6 are in parallel and are respectively connected to point U, point M and point Y. After the fifth inductor L5 and the sixth inductor L6 are in parallel, they are connected in series with the second capacitor C2. The two ends of the second capacitor C2 are respectively connected to point V and point Y. Point Y is simultaneously connected to one end of each of the seventh inductor L7 and the eighth inductor L8. The other end of the seventh inductor L7 is point X, and the other end of the eighth inductor L8 is N; Variable circuit topology Ⅶ - T - shaped filter of the second variable - structure circuit unit: The fourth power switch S4 is open, and the fifth power switch S5 and the sixth power switch S6 are closed. Since the fifth power switch S5 is closed, point X and point N are combined into one point. At this time, the second variable - configuration I - shaped filter becomes a T - shaped filter: The seventh inductor L7 and the eighth inductor L8 are in parallel and are respectively connected to point Y and point X, point N. After the seventh inductor L7 and the eighth inductor L8 are in parallel, they are connected in series with the second capacitor C2. The two ends of the second capacitor C2 are respectively connected to point Y and point V. Point V is simultaneously connected to one end of each of the fifth inductor L5 and the sixth inductor L6. The other end of the fifth inductor L5 is point U, and the other end of the sixth inductor L6 is point M.

6. A bidirectional wireless power transmission circuit system based on variable structure according to claim 1, characterized in that, When the energy flows from port AE to port MN, the first variable - structure circuit unit is the input side: When the variable circuit topology of the first variable - structure circuit unit is Ⅰ - double - inductor type, it is a boost topology and is suitable for boost application scenarios; The variable circuit topology of the first variable - structure circuit unit is Ⅱ - I - shaped variable - capacitor type, which is suitable for application scenarios where there are a large number of harmonics at the input of port AE. And by controlling the duty ratio d3 of the third power switch S3, the series branch of the power switch S3 and the first capacitor C1 is equivalent to a capacitor Cd with programmable capacitance, Cd = d3*C1, to adapt to different harmonic working conditions; The variable circuit topology of the first variable - structure circuit unit is Ⅲ - short - circuit type, which is a buck topology and is suitable for buck application scenarios; The variable circuit topology of the first variable - structure circuit unit is Ⅳ - upper - inductor type, which is a boost topology and is suitable for boost application scenarios. Compared with the circuit topology Ⅰ - double - inductor type, the inductance is smaller; The variable circuit topology of the first variable - structure circuit unit is Ⅴ - lower - inductor type, which is suitable for boost application scenarios. Compared with the circuit topology Ⅰ - double - inductor type, the inductance is smaller; The variable circuit topology Ⅵ - ⊥ - shaped filter of the first variable - structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the input of port AE. Different from the circuit topology Ⅱ - I - shaped variable - capacitor type, the capacitance in the circuit topology Ⅵ - ⊥ - shaped filter is not adjustable; The variable circuit topology Ⅶ - T - shaped filter of the first variable - structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the input of port AE. Different from the circuit topology Ⅱ - I - shaped variable - capacitor type, the capacitance in the circuit topology Ⅵ - T - shaped filter is not adjustable. When the energy flows from port AE to port MN, the second variable - structure circuit unit is the output side. At this time, all variable circuit topologies of the second variable - structure circuit unit are buck circuit topologies: The variable circuit topology I - double - inductor type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter only acts as a filtering inductor; The variable circuit topology II - I - shaped variable - capacitor type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is an I - shaped filter, and the equivalent capacitance Cv is programmable by controlling the duty cycle d6 of the sixth power switch S6 to adapt to different harmonic conditions and dynamic impedance matching; The variable circuit topology III - short - circuit type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is only equivalent to a wire; The variable circuit topology IV - upper - inductor type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is only equivalent to a filtering inductor and has a smaller inductance value compared with the variable circuit topology I - double - inductor type of the second variable - structure circuit unit; The variable circuit topology V - lower - inductor type of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is only equivalent to a filtering inductor and has a smaller inductance value compared with the variable circuit topology I - double - inductor type of the second variable - structure circuit unit; The variable circuit topology VI - ⊥ - shaped filter of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is equivalent to a ⊥ - shaped filter and the capacitance size remains unchanged; The variable circuit topology VII - T - shaped filter of the second variable - structure circuit unit: The second variable - configuration I - shaped filter is equivalent to a T - shaped filter and the capacitance size remains unchanged.

7. A bidirectional wireless power transmission circuit system based on variable structure according to claim 1, characterized in that When the energy flows from the MN - side port to the AE - side port, the second variable - structure circuit unit is the input side: When the variable circuit topology of the second variable - structure circuit unit is of the I - double - inductor type, it is a boost topology, suitable for boost application scenarios; The variable circuit topology II - I - shaped variable - capacitor type of the second variable - structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the MN - port input. And by controlling the duty cycle d6 of the sixth power switch S6, the series branch of the sixth power switch S6 and the second capacitor C2 is equivalent to a capacitor Cv with programmable capacitance size, Cv = d6 * C2, to adapt to different harmonic conditions; The variable circuit topology III - short - circuit type of the second variable - structure circuit unit is a buck topology, suitable for buck application scenarios; The variable circuit topology IV - upper - inductor type of the second variable - structure circuit unit is a boost topology, suitable for boost application scenarios, and has a smaller inductance compared with the variable circuit topology I - double - inductor type; The variable circuit topology V - lower - inductor type of the second variable - structure circuit unit is suitable for boost application scenarios and has a smaller inductance compared with the variable circuit topology I - double - inductor type; The variable circuit topology VI - ⊥ - shaped filter of the second variable - structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the AE - port input. Different from the circuit topology II - I - shaped variable - capacitor type, the capacitance size in the variable circuit topology VI - ⊥ - shaped filter is not adjustable; The variable circuit topology VII - T - shaped filter of the second variable - structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the AE - port input. Different from the variable circuit topology II - I - shaped variable - capacitor type, the capacitance size in the variable circuit topology VI - T - shaped filter is not adjustable. When the energy flows from the MN - side port to the AE - side port, the first variable - structure circuit unit is the output side. At this time, all variable circuit topologies of the first variable - structure circuit unit are buck circuit topologies: When the variable circuit topology of the first variable - structure circuit unit is of the I - double - inductor type, it is a boost topology, suitable for boost application scenarios; The variable circuit topology Ⅱ - I-shaped variable capacitance type of the first variable structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the port AE input. And by controlling the duty cycle d3 of the third power switch S3, the series branch of the third power switch S3 and the first capacitor C1 is equivalent to a capacitor Cd with programmable capacitance, where Cd = d3 * C1, to adapt to different harmonic working conditions and dynamic impedance matching; The variable circuit topology Ⅲ - short-circuit type of the first variable structure circuit unit is a buck topology and is suitable for buck application scenarios; The variable circuit topology Ⅳ - upper inductor type of the first variable structure circuit unit is a boost topology and is suitable for boost application scenarios. Compared with the variable circuit topology Ⅰ - double inductor type, it has a smaller inductance; The variable circuit topology Ⅴ - lower inductor type of the first variable structure circuit unit is suitable for boost application scenarios. Compared with the variable circuit topology Ⅰ - double inductor type, it has a smaller inductance; The variable circuit topology Ⅵ - ⊥-shaped filter of the first variable structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the port MN input. Different from the variable circuit topology Ⅱ - I-shaped variable capacitance type, the capacitance in the variable circuit topology Ⅵ - ⊥-shaped filter is not adjustable; The variable circuit topology Ⅶ - T-shaped filter of the first variable structure circuit unit is suitable for application scenarios where there are a large number of harmonics at the port AE input. Different from the variable circuit topology Ⅱ - I-shaped variable capacitance type, the capacitance in the variable circuit topology Ⅵ - T-shaped filter is not adjustable.

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