Wireless power transmission system with variable topology

Abstract

A topology-variable wireless power transmission system disclosed by the present invention comprises a first variable filter, a first H bridge, a wireless power transmission module, a second variable filter and a second H bridge which are sequentially connected in series, a port AB is at one side of the first variable filter, and the other side CB of the first variable filter is connected in series with the first H bridge. The other side HI of the first H bridge is connected in series with one side of the wireless electric energy transmission module, the other side OP of the wireless electric energy transmission module is connected in series with one side of the second H bridge, the other side UW of the second H bridge is connected in series with one side of the second variable filter, and the other side of the second variable filter is a port MN. The wireless power transmission system has the outstanding advantages that a variable circuit topology structure is applied, so that the system circuit topology has flexible conversion capability, the instant requirements of the bidirectional wireless power transmission system under different working conditions can be met, and a foundation is built for stable optimization of multifunctional application of wireless power transmission.

Description

Technical Field

[0001] The present invention belongs to the technical fields of power electronics applications and wireless power transmission technology, and particularly relates to a wireless power transmission system with variable topology. Background Art

[0002] Nowadays, wireless power transmission is widely used in fields such as transportation and household appliances, and the use of bidirectional wireless power transmission circuits is becoming increasingly common. In practical applications, the input and output ends of this circuit will switch roles according to the working conditions, and different working conditions have different technical requirements for them, thus posing a great challenge to the adaptability of the circuit. At present, most bidirectional wireless power transmission circuits adopt a fixed topology structure. Facing different input and output conditions, especially when the input and output ends are interchanged, the traditional fixed structure is often difficult to adapt to the real-time working conditions immediately, and the technical limitations are significant. Summary of the Invention

[0003] The present invention proposes a circuit of a wireless power transmission system with variable topology. This system can switch the circuit topology in real time according to different working conditions, accurately match the current technical requirements, and demonstrate excellent flexibility and adaptability. In the bidirectional wireless power transmission scenario, the roles of the input and output ends will be converted with each other as the working conditions change. When the circuit topology is fixed, it is very easy to reduce the overall performance of the system due to the inability to adapt to various working conditions; on the contrary, if a variable circuit topology design is adopted, it can be flexibly adjusted according to various complex working conditions and diverse requirements, comprehensively optimize the system performance, and ensure the high efficiency and stability of power transmission.

[0004] The present invention uses a variable circuit topology structure to solve the technical requirement problem that a fixed circuit topology cannot well adapt to the real-time working conditions, especially when the input and output ends are interchanged, in different working conditions of bidirectional wireless power transmission.

[0005] The present invention provides a wireless power transmission system with variable topology, including: a first variable filter, a first H-bridge, a wireless power transmission module, a second variable filter, and a second H-bridge connected in series in sequence. Ports AB are simultaneously on one side of the first variable filter, the other side CB of the first variable filter is connected in series with the first H-bridge, the other side HI of the first H-bridge 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 second H-bridge, the other side UW of the second H-bridge is connected in series with one side of the second variable filter, and the other side of the second variable filter is simultaneously port MN;

[0006] The first variable filter includes a first inductor L1, a second inductor L2, a first power switch S1, a second power switch S2, and a first capacitor C1. Among them, point A of port AB is respectively connected to one side of the first inductor L1 and one side of the first power switch S1; the other side of the first inductor L1 is respectively connected to one side of the second inductor L2 and one side of the second power switch S2, and the intersection point is point D; the other side of the second inductor L2 is connected to the other side of the first power switch S1, and the intersection point is point C; the other side of the second power switch S2 is connected to one side of the first capacitor C1, and the other side of the first capacitor C1 is connected to point B of port AB;

[0007] The first H-bridge includes a fifth power switch Q1, a sixth power switch Q2, a seventh power switch Q3, and an eighth power switch Q4. Among them, one end of each of the fifth power switch Q1 and the seventh power switch Q3 is connected to point C; one end of each of the sixth power switch Q2 and the eighth power switch Q4 is connected to point B. The fifth power switch Q1 and the sixth power switch Q2 form a bridge arm with the midpoint being H, and the seventh power switch Q3 and the eighth power switch Q4 form another bridge arm with the midpoint being I. Port HI is connected to one end of the wireless power transmission module;

[0008] The second H-bridge includes a ninth power switch K1, a tenth power switch K2, an eleventh power switch K3, and a twelfth power switch K4. Among them, one end of each of the ninth power switch K1 and the eleventh power switch K3 is connected, and the intersection point is point U; one end of each of the tenth power switch K2 and the twelfth power switch K4 is connected, and the intersection point is point X. The ninth power switch K1 and the tenth power switch K2 form a bridge arm with the midpoint being O, and the eleventh power switch K3 and the twelfth power switch K4 form another bridge arm with the midpoint being P; Port OP is connected to the other end of the wireless power transmission module;

[0009] The second variable filter includes a third inductor L3, a fourth inductor L4, a third power switch S3, a fourth power switch S4, and a second capacitor C2. One U point of the second H-bridge is connected to one side of each of the third L3 and the fourth power switch S4, point V is connected to the other side of the third inductor L3 and one side of each of the fourth inductor L4 and the fourth power switch S4, one end point M of the system circuit is connected to one side of the fourth inductor L4, the fourth power switch S4 and the second capacitor C2 are connected in series and one end of the fourth power switch S4 is connected to point V, and one end of the second capacitor C2 is connected to the other end point N of the second H-bridge. Point N is also one end point of the second variable filter and the other end point of the system circuit;

[0010] Among them, the wireless power transmission system has the ability of bidirectional energy flow, that is: energy flows from port AB to port MN, and energy flows from port MN to port AB.

[0011] Further, the first variable filter has the ability of topological transformation. According to the different working states of the first power switch S1 and the second power switch S2, the first variable filter has 4 variable topological structures, specifically:

[0012] Variable circuit topology Ⅰ - inductive type of the first variable filter: Both the first power switch S1 and the second power switch S2 are always off, then the first variable filter is equivalent to only the first inductor L1 and the second inductor L2 being connected to the circuit. Using the inductive type means that only inductors are required for this working condition.

[0013] Variable circuit topology Ⅱ - short - circuit type of the first variable filter: The first power switch S1 is closed and the second power switch S2 is off, then the first variable filter is equivalent to a wire. Using the short - circuit type means that no filter is required for this working condition.

[0014] Variable circuit topology Ⅲ - variable Ca - T filter type of the first variable filter: The first power switch S1 is off and the on - off of the second power switch S2 is controlled. Then the first variable filter is equivalent to a T - filter: The first inductor L1 is connected between points A and D, the second inductor L2 is connected between points D and C, and the second power switch S2 and the first capacitor C1 are connected in series and then connected between points D and B. By controlling the duty cycle D2 of the second power switch S2, the second power switch S2 and the capacitor C1 in series are equivalent to an equivalent capacitor Ca with a controllable capacitance value, and Ca = D2 * C1. Using the variable - parameter T - filter type can dynamically adjust the equivalent capacitor Ca according to different real - time needs to filter different harmonics, perform impedance matching, and adjust dynamic stability.

[0015] Variable circuit topology Ⅳ - LaC series type of the first variable filter: Both the first power switch S1 and the second power switch S2 are closed, then points A and C are the same point. The first variable filter is equivalent to an LC series: The first inductor L1 and the second inductor L2 are in parallel and then equivalent to an inductor La connected between points C and D, and La = L1 / / L2. The first capacitor C1 is connected in series with the inductor La, and the first capacitor C1 is connected between points D and B. In this working condition, this LaC series type is designed as a notch filter.

[0016] 3. A wireless power transmission system with variable topology according to claim 1, wherein the second variable filter has the ability of topological transformation. According to the different working states of the third power switch S3 and the fourth power switch S4, the second variable filter has 4 variable topological structures, specifically:

[0017] Variable circuit topology Ⅰ - inductive type of the second variable filter: Both the third power switch S3 and the fourth power switch S4 are always off, then the second variable filter is equivalent to only the third inductor L3 and the fourth inductor L4 being connected to the circuit. Using the inductive type means that only inductors are required for this working condition.

[0018] The variable circuit topology Ⅱ - short - circuit type of the second variable filter: When the third power switch S3 is closed and the fourth power switch S4 is open, the second variable filter is equivalent to a wire. In the short - circuit type, that is, the corresponding working condition does not require a filter.

[0019] The variable circuit topology Ⅲ - variable Cr - T - type filter of the second variable filter: When the third power switch S3 is open and the fourth power switch S4 is controlled to be on or off, the second variable filter is equivalent to a T - type filter: The third inductor L3 is connected between points U and V, the fourth inductor L4 is connected between points V and M, and the fourth power switch S4 is connected in series with the second capacitor C2 and then connected between points V and N. By controlling the duty cycle D4 of the fourth power switch S4, the series connection of the fourth power switch S4 and the second capacitor C2 is equivalent to an equivalent capacitor Cr with a controllable capacitance value, and Cr = D4 * C2. Using the variable - parameter T - type filter can dynamically adjust the equivalent capacitor Cr according to different real - time requirements to filter different harmonics, perform impedance matching, and adjust dynamic stability.

[0020] The variable circuit topology Ⅳ - LrC series type of the second variable filter: When the third power switch S3 and the fourth power switch S4 are closed, points U and M are the same point, and the second variable filter is equivalent to an LC series connection: The third inductor L3 and the fourth inductor L4 are connected in parallel and then equivalent to an inductor Lr connected between points C and D, and Lr = L3 / / L4. The second capacitor C2 is connected in series with the equivalent inductor with variable parameters, and the second capacitor C2 is connected between points V and N. This LrC series type is designed as a notch filter.

[0021] Furthermore, when the energy flows from the AB - side port to the MN - side port:

[0022] The variable circuit topology Ⅰ - inductor type of the first variable filter and the first H - bridge form a boost circuit at this time, which is suitable for application scenarios where the input current needs to be stable and boost is required.

[0023] The variable circuit topology Ⅱ - short - circuit type of the first variable filter and the first H - bridge form a buck circuit at this time, which is suitable for application scenarios where no filter is required.

[0024] The variable circuit topology Ⅲ - variable Ca - T - type filter of the first variable filter and the first H - bridge form a boost circuit at this time, which is suitable for dynamically adjusting the equivalent capacitor Ca according to different real - time requirements to filter different harmonics, perform input impedance matching, and adjust dynamic stability.

[0025] The variable circuit topology Ⅳ - LaC series type of the first variable filter is a notch filter with a resonant frequency fa = 1 / [2π(La * C)^0.5] and forms a buck circuit with the first H - bridge at this time, which is suitable for filtering harmonics with frequencies near the resonant frequency fa.

[0026] When energy flows from the MN side of the port to the AB side of the port, both the first H-bridge and the first variable filter form a buck circuit:

[0027] The variable circuit topology I - inductive type of the first variable filter is applicable to application scenarios where stable output current is required and low requirements are placed on the output voltage ripple;

[0028] The variable circuit topology II - short - circuit type of the first variable filter is applicable to application scenarios without the need for any filter;

[0029] The variable circuit topology III - variable Ca - T - type filter of the first variable filter is applicable to application scenarios where the equivalent capacitance Ca is dynamically regulated according to real - time needs to filter different harmonics, and application scenarios where input impedance matching and dynamic stability regulation are performed by dynamically regulating the equivalent capacitance Ca;

[0030] The variable circuit topology IV - LaC series type of the first variable filter is applicable to forming a specific - frequency notch filter at the resonant frequency fa = 1 / [2π(La*C)^0.5].

[0031] Furthermore, when energy flows from the MN side of the port to the AB side of the port:

[0032] The variable circuit topology I - inductive type of the second variable filter and the second H - bridge form a boost circuit at this time, which is applicable to application scenarios where stable input current is required and boost applications;

[0033] The variable circuit topology II - short - circuit type of the second variable filter and the second H - bridge form a buck circuit at this time, which is applicable to application scenarios without the need for any filter;

[0034] The variable circuit topology III - variable Cr - T - type filter of the second variable filter and the second H - bridge form a boost circuit at this time, which is applicable to: application scenarios where the equivalent capacitance Cr is dynamically regulated according to different real - time harmonics for filtering, and application scenarios where input impedance matching and dynamic stability regulation are performed by dynamically regulating the equivalent capacitance Cr;

[0035] The variable circuit topology IV - LrC series type of the second variable filter is a notch filter with a resonant frequency fr = 1 / [2π(Lr*C)^0.5], which is applicable to filtering harmonics at frequencies near the resonant frequency fr;

[0036] When energy flows from the AB side of the port to the MN side of the port, both the second H - bridge and the second variable filter form a buck circuit:

[0037] The variable circuit topology I - inductive type of the second variable filter is applicable to application scenarios where stable output current is required and low requirements are placed on the output voltage ripple;

[0038] The variable circuit topology Ⅱ - short - circuit type of the second variable filter is applicable to any filter - free application scenarios;

[0039] The variable circuit topology Ⅲ - variable Cr - T - type filter of the second variable filter is applicable to dynamically regulating the equivalent capacitance Cr according to different real - time needs to filter different harmonics, and for input impedance matching and dynamic stability regulation;

[0040] The variable circuit topology Ⅳ - LrC series type of the second variable filter is a notch filter with a resonant frequency fr = 1 / [2π(Lr*C)^0.5], and is applicable to filtering harmonics with frequencies near the resonant frequency fr.

[0041] Furthermore, the first H - bridge has the ability to transform among multiple operating conditions, specifically including:

[0042] When energy flows from the AB - side port to the MN - side port:

[0043] When the voltage u1 of the AB port is AC, the first H - bridge performs a direct AC - AC conversion to excite the wireless power transfer module;

[0044] When the voltage u1 of the AB port is DC, the first H - bridge performs an inversion to excite the wireless power transfer module;

[0045] When energy flows from the MN - side port to the AB - side port:

[0046] When the voltage u1 of the left - hand AB port is AC, the first H - bridge performs a direct AC - AC conversion;

[0047] When the voltage u1 of the left - hand AB port is DC, the first H - bridge performs an active rectification.

[0048] Furthermore, the second H - bridge has the ability to transform among multiple operating conditions, specifically including:

[0049] When energy flows from the AB - side port to the MN - side port:

[0050] When the voltage u2 of the MN port is AC, the second H - bridge performs a direct AC - AC conversion;

[0051] When the voltage u2 of the MN port is DC, the second H - bridge performs an active rectification;

[0052] When energy flows from the MN - side port to the AB - side port:

[0053] When the voltage u2 of the MN port is AC, the second H - bridge performs a direct AC - AC conversion to excite the wireless power transfer module;

[0054] When the voltage u2 of the MN port is DC, the second H - bridge performs an inversion to excite the wireless power transfer module.

[0055] A wireless power transmission system with variable topology according to the present invention can switch the circuit topologies of the first variable filter and the second variable filter in real time by controlling each power switch to cope with complex and changeable practical applications. The outstanding advantage lies in the use of a variable circuit topology structure, enabling the system circuit topology to have the ability to flexibly transform and meet the immediate needs of a bidirectional wireless power transmission system under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0057] Figure 1 It is the main circuit topology diagram of a wireless power transmission system with variable topology according to the present invention;

[0058] Figure 2 It is the circuit topology diagram of the left part of the wireless power transmission according to the present invention;

[0059] Figure 3 It is the circuit topology diagram of the right part of the wireless power transmission according to the present invention;

[0060] Figure 4 It is the circuit diagram of the left variable circuit topology Ⅰ - inductance type;

[0061] Figure 5 It is the circuit diagram of the left variable circuit topology Ⅱ - short - circuit type;

[0062] Figure 6 It is the circuit diagram of the left variable circuit topology Ⅲ - variable Ca - T - type filter;

[0063] Figure 7 It is the circuit diagram of the left variable circuit topology Ⅳ - LaC series type;

[0064] Figure 8 It is the circuit diagram of the right variable circuit topology Ⅰ - inductance type;

[0065] Figure 9 It is the circuit diagram of the right variable circuit topology Ⅱ - short - circuit type;

[0066] Figure 10 It is the circuit diagram of the right variable circuit topology Ⅲ - variable Cr - T - type filter;

[0067] Figure 11 It is the circuit diagram of the right variable circuit topology Ⅳ - LrC series type. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0068] 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. Obviously, 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.

[0069] Figure 1 This is the main circuit topology diagram of the wireless power transmission system circuit with variable topology of the present invention.

[0070] A wireless power transmission system circuit with variable topology is composed of five parts: a left variable filter (the first variable filter), a left H-bridge (the first H-bridge), a wireless power transmission module, a right variable filter (the second variable filter), and a right H-bridge (the second H-bridge) connected in series with each other; the left port AB is simultaneously one side of the left variable filter, the other side CB of the left variable filter is connected in series with the left H-bridge, the other side HI of the left H-bridge is 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 right H-bridge, the other side UW of the right H-bridge is connected in series with one side of the right variable filter, and the other side of the right variable filter is simultaneously the right port MN.

[0071] Figure 2 This is the circuit topology diagram of the left part of the wireless power transmission of the present invention.

[0072] The present invention has the ability of bidirectional wireless power energy transmission. Taking the wireless power transmission module as the demarcation point, there are also the left part and the right part of the circuit. The left part of the circuit is composed of the left variable filter and the left H-bridge connected in series, and the right part of the circuit is composed of the right H-bridge and the right variable filter connected in series.

[0073] The left variable filter includes L1, L2, S1, S2 and C1, which are composed of L1, L2, S1, S2 and the capacitor C1. One end point A of the left side of the system circuit is connected to one side of L1 and S1 respectively, point D is connected to the other side of L1 and one side of L2 and S2, point C is connected to one side of L2 and is also one end point on the left side of the left H-bridge, point B is connected to one side of C1 and is the other end point on the left side of the H-bridge. S2 is connected in series with the capacitor C1 and one end of S2 is connected to point B, and one end of C1 is connected to point B, the other end point on the left side of the system circuit.

[0074] The left H-bridge includes Q1-Q4. One end of each of Q1 and Q3 is connected to point C, one end of each of Q2 and Q4 is connected to point B. Q1 and Q2 form a bridge arm with the midpoint being H, and Q3 and Q4 form another bridge arm with the midpoint being I; the port HI is connected to one end of the wireless power transmission module.

[0075] Figure 3 This is the circuit topology diagram of the right part of the wireless power transmission of the present invention.

[0076] The circuit of the right part of the wireless power transmission of the present invention is composed of a right H-bridge and a right variable filter connected in series.

[0077] The right H-bridge includes K1-K4. One end of each of K1 and K3 is connected to point U, and one end of each of K2 and K4 is connected to point X. K1 and K2 form a bridge arm with the midpoint being O, and K3 and K4 form another bridge arm with the midpoint being P; the port OP is connected to the other end of the wireless power transmission module.

[0078] The right variable filter is composed of L3, L4, S3, S4 and C2. One end U on the right side of the right H-bridge is connected to one side of each of L3 and S4, point V is connected to the other side of L3 and one side of each of L4 and S4, one end M on the right side of the system circuit is connected to one side of L4, S4 and C2 are connected in series and one end of S4 is connected to point V, and one end of C2 is connected to the other end N on the right side of the right H-bridge. Point N is also one end of the right variable filter and the other end of the system circuit on the right side.

[0079] The left variable filter has the ability of topology transformation. According to the different working states of S1 and S2, the left variable filter has 4 kinds of variable topology structures, as Figures 4 to 7 shown.

[0080] Figure 4 It is the circuit diagram of the left variable circuit topology Ⅰ - inductance type.

[0081] The variable circuit topology Ⅰ - inductance type of the left variable filter in series with the left H-bridge constitutes the left variable circuit topology Ⅰ - inductance type circuit;

[0082] For the variable circuit topology Ⅰ - inductance type of the left variable filter: if S1 and S2 are both always off, then the left variable filter is equivalent to only L1 and L2 being connected to the circuit, and the inductance type is adopted, that is, only inductance is required for the working condition at this time; that is, when the energy flows from the left port AB side to the right port MN side, the left variable circuit topology Ⅰ - inductance type circuit is applicable to the application occasions where the input current is required to be stable and the requirement for the stability of the input voltage is not high or the input voltage is stable by itself; when the energy flows from the right port MN side to the left port AB side, the left variable circuit topology Ⅰ - inductance type circuit is applicable to the application occasions where the output current is required to be stable and the requirement for the output voltage ripple is not high.

[0083] Figure 5 It is the circuit diagram of the left variable circuit topology Ⅱ - short-circuit type.

[0084] The variable circuit topology Ⅱ - short - circuit type of the left - hand variable filter: The series left - hand H - bridge with short - circuit type forms the variable circuit topology Ⅱ - short - circuit type circuit of the left - hand variable filter;

[0085] For the variable circuit topology Ⅱ - short - circuit type of the left - hand variable filter: When S1 is closed and S2 is open, the left - hand variable filter is equivalent to a wire. In the short - circuit type, no filter is required in this working condition. That is, no filter is needed whether the energy flows from port AB to port MN or from port MN to port AB.

[0086] Figure 6 It is the circuit diagram of the variable circuit topology Ⅲ - variable Ca - T filter type of the left - hand variable filter.

[0087] The variable circuit topology Ⅲ - variable parameter T - filter type of the left - hand variable filter and the series left - hand H - bridge form the variable circuit topology Ⅲ - variable Ca - T filter type circuit of the left - hand variable filter;

[0088] For the variable circuit topology Ⅲ - variable parameter T - filter type of the left - hand variable filter: When S1 is open and the on - off of S2 is controlled, the left - hand variable filter is equivalent to a T - filter: L1 is connected between points A and D, L2 is connected between points D and C, and S2 is connected in series with C1 and then connected between points D and B. By controlling the duty cycle D2 of S2, the series connection of S2 and C1 is equivalent to an equivalent capacitor Ca with a controllable capacitance value, and Ca = D2 * C1. The variable parameter T - filter type can dynamically adjust the equivalent capacitor Ca according to different real - time requirements to filter different harmonics, perform impedance matching, and adjust dynamic stability. That is, when the energy flows from the left - hand port AB side to the right - hand port MN side, the variable circuit topology Ⅲ - variable Ca T - filter type circuit of the left - hand variable filter is suitable for dynamically adjusting the equivalent capacitor Ca according to different real - time requirements to filter different harmonics, perform input impedance matching, and adjust dynamic stability; when the energy flows from the right - hand port MN side to the left - hand port AB side, the variable circuit topology Ⅲ - variable Ca - T filter type circuit of the left - hand variable filter is suitable for dynamically adjusting the equivalent capacitor Ca according to different real - time requirements to filter different output harmonics in real - time, perform output impedance matching, and adjust dynamic stability.

[0089] Figure 7 It is the circuit diagram of the variable circuit topology Ⅳ - LaC series type of the left - hand variable filter.

[0090] The variable circuit topology Ⅳ - LaC series type of the left - hand variable filter and the series left - hand H - bridge form the variable circuit topology Ⅳ - LaC series type circuit of the left - hand variable filter;

[0091] The variable circuit topology Ⅳ - LaC series type of the left - hand variable filter: When S1 and S2 are closed, points A and C are the same point. The left - hand variable filter is equivalent to a LaC series connection: After L1 and L2 are connected in parallel, they are equivalent to an inductor La connected between points C and D, and La = L1 / / L2. C1 is in series with the inductor La, and C1 is connected between points D and B. In this operating condition, this LaC series type is designed as a notch filter, that is, when energy flows from the left - hand port AB side to the right - hand port MN side, the input harmonics at frequencies near the resonant frequency fa = 1 / [2π(La*C)^0.5] are removed; when energy flows from the right - hand port MN side to the left - hand port AB side, the output harmonics at frequencies near the resonant frequency fa = 1 / [2π(La*C)^0.5] are removed.

[0092] The right - hand variable filter has the ability of topology transformation. According to the different working states of S3 and S4, the right - hand variable filter has 4 variable topologies, as Figures 8 to 11 shown.

[0093] Figure 8 It is the circuit diagram of the right - hand variable circuit topology Ⅰ - inductor type.

[0094] The right - hand H - bridge in series with the right - hand variable filter of the variable circuit topology Ⅰ - inductor type forms the right - hand variable circuit topology Ⅰ - inductor type circuit;

[0095] The variable circuit topology Ⅰ - inductor type of the right - hand variable filter: When S3 and S4 are both always open, the right - hand variable filter is equivalent to only L3 and L4 being connected to the circuit. Using the inductor type means that only an inductor is required in this operating condition. That is, when energy flows from the left - hand port AB side to the right - hand port MN side, the right - hand variable circuit topology Ⅰ - inductor type circuit is suitable for application scenarios where a stable output current is required and the requirement for output voltage ripple is not high; when energy flows from the right - hand port MN side to the left - hand port AB side, the right - hand variable circuit topology Ⅰ - inductor type circuit is suitable for application scenarios where a stable input current is required and the requirement for input voltage stability is not high or the input voltage is self - stable.

[0096] Figure 9 It is the circuit diagram of the right - hand variable circuit topology Ⅱ - short - circuit type.

[0097] The right - hand H - bridge in series with the right - hand variable filter of the variable circuit topology Ⅱ - short - circuit type forms the right - hand variable circuit topology Ⅱ - short - circuit type circuit;

[0098] The variable circuit topology Ⅱ - short - circuit type of the right - hand variable filter: When S3 is closed and S4 is open, the right - hand variable filter is equivalent to a wire. Using the short - circuit type means that no filter is required for the corresponding operating condition, that is, no filter is required whether energy flows from port AB to port MN or from port MN to port AB.

[0099] Figure 10It is the circuit diagram of the right-side variable circuit topology III - variable Cr T-shaped filter type.

[0100] The variable circuit topology III - variable parameter T-shaped filter type with the right-side H-bridge in series with the right-side variable filter forms the right-side variable circuit topology III - variable Cr T-shaped filter type circuit;

[0101] For the variable circuit topology III - variable Cr - T-shaped filter type of the right-side variable filter: When S3 is disconnected and the on-off of S4 is controlled, the right-side variable filter is equivalent to a T-shaped filter: L3 is connected between points U and V, L4 is connected between points V and M, S4 is connected in series with C2 and then connected between points V and N. By controlling the duty cycle D4 of S4, S4 and the capacitor C2 in series are equivalent to an equivalent capacitor Cr with a controllable capacitance value, and Cr = D4 * C2. The variable parameter T-shaped filter type can dynamically adjust the equivalent capacitor Cr according to different real-time needs to filter different harmonics, perform impedance matching, and adjust dynamic stability;

[0102] That is, when the energy flows from the left-side port AB side to the right-side port MN side, the right-side variable circuit topology III - variable Cr - T-shaped filter type circuit is suitable for dynamically adjusting the equivalent capacitor Cr according to different real-time needs to filter different output harmonics in real time, perform output impedance matching, and adjust dynamic stability;

[0103] When the energy flows from the right-side port MN side to the left-side port AB side, the right-side variable circuit topology III - variable Cr - T-shaped filter type circuit is suitable for: filtering the application occasions by dynamically adjusting the equivalent capacitor Cr according to different real-time harmonics, and the application occasions of dynamically adjusting the equivalent capacitor Cr to filter different harmonics in real time, perform input impedance matching, and adjust dynamic stability.

[0104] Figure 11 It is the circuit diagram of the right-side variable circuit topology IV - LrC series type.

[0105] The variable circuit topology IV - LrC series type with the right-side H-bridge in series with the right-side variable filter forms the right-side variable circuit topology IV - LrC series type circuit;

[0106] The variable circuit topology Ⅳ-LrC series type of the right variable filter: When S3 and S4 are closed, U and M are the same point, and the right variable filter is equivalent to an LrC series connection: After L3 and L4 are connected in parallel, they are equivalent to an inductor Lr connected between points C and D, and Lr = L3 / / L4. C2 is connected in series with the variable parameter of the equivalent inductor and is connected between points V and N; this LrC series type is designed as a notch filter, that is, the right variable circuit topology Ⅳ-LrC series type circuit is suitable for forming a specific frequency notch filter at the resonant frequency fr = 1 / [2π(Lr*C)^0.5], that is, when energy flows from the left port AB side to the right port MN side, the output harmonics of the frequency near fr are removed; when energy flows from the right port MN side to the left port AB side, the input harmonics of the frequency near fr are removed.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; 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 described 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 wireless power transmission system with variable topology, characterized in that, Comprising: A first variable filter, a first H-bridge, a wireless power transmission module, a second variable filter, and a second H-bridge connected in series in sequence. Ports AB are simultaneously one side of the first variable filter. The other side CB of the first variable filter is connected in series with the first H-bridge. The other side HI of the first H-bridge 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 second H-bridge. The other side UW of the second H-bridge is connected to one side of the second variable filter. The other side of the second variable filter is simultaneously port MN; The first variable filter includes a first inductor L1, a second inductor L2, a first power switch S1, a second power switch S2, and a first capacitor C1. Wherein, point A of port AB is respectively connected to one side of the first inductor L1 and one side of the first power switch S1; The other side of the first inductor L1 is respectively connected to one side of the second inductor L2 and one side of the second power switch S2, and the intersection point is point D; The other side of the second inductor L2 is connected to the other side of the first power switch S1, and the intersection point is point C; The other side of the second power switch S2 is connected to one side of the first capacitor C1, and the other side of the first capacitor C1 is connected to point B of port AB; The first H-bridge includes a fifth power switch Q1, a sixth power switch Q2, a seventh power switch Q3, and an eighth power switch Q4. Wherein, one end of each of the fifth power switch Q1 and the seventh power switch Q3 is connected to point C; One end of each of the sixth power switch Q2 and the eighth power switch Q4 is connected to point B. The fifth power switch Q1 and the sixth power switch Q2 form a bridge arm with the midpoint being H, and the seventh power switch Q3 and the eighth power switch Q4 form another bridge arm with the midpoint being I. Port HI is connected to one end of the wireless power transmission module; The second H-bridge includes a ninth power switch K1, a tenth power switch K2, an eleventh power switch K3, and a twelfth power switch K4. Wherein, one end of each of the ninth power switch K1 and the eleventh power switch K3 is connected, and the intersection point is point U; One end of each of the tenth power switch K2 and the twelfth power switch K4 is connected, and the intersection point is point X. The ninth power switch K1 and the tenth power switch K2 form a bridge arm with the midpoint being O, and the eleventh power switch K3 and the twelfth power switch K4 form another bridge arm with the midpoint being P; Port OP is connected to the other end of the wireless power transmission module; The second variable filter includes a third inductor L3, a fourth inductor L4, a third power switch S3, a fourth power switch S4, and a second capacitor C2. One point U of the second H-bridge is connected to one side of each of the third L3 and the fourth power switch S4. Point V is connected to the other side of the third inductor L3 and one side of each of the fourth inductor L4 and the fourth power switch S4. One end point M of the system circuit is connected to one side of the fourth inductor L4. The fourth power switch S4 is connected in series with the second capacitor C2 and one end of the fourth power switch S4 is connected to point V. One end of the second capacitor C2 is connected to the other end point N of the second H-bridge. Point N is also one end point of the second variable filter and the other end point of the system circuit; Among them, the wireless power transmission system has the ability of bidirectional energy flow, that is: energy flows from port AB to port MN, and energy flows from port MN to port AB.

2. The wireless power transmission system with variable topology according to claim 1, wherein The first variable filter has the ability of topology transformation. According to the different working states of the first power switch S1 and the second power switch S2, the first variable filter has 4 kinds of variable topologies, specifically: Variable circuit topology I - inductive type of the first variable filter: Both the first power switch S1 and the second power switch S2 are always off, then the first variable filter is equivalent to only the first inductor L1 and the second inductor L2 being connected to the circuit. Adopting the inductive type means that only inductors are required for this working condition at this time; Variable circuit topology II - short - circuit type of the first variable filter: The first power switch S1 is closed while the second power switch S2 is off, then the first variable filter is equivalent to a wire. Adopting the short - circuit type means that no filter is required for this working condition; Variable circuit topology III - variable Ca - T - type filter of the first variable filter: The first power switch S1 is off and the on - off of the second power switch S2 is controlled. Then the first variable filter is equivalent to a T - type filter: The first inductor L1 is connected between points A and D, the second inductor L2 is connected between points D and C, and the second power switch S2 is connected in series with the first capacitor C1 and then connected between points D and B. By controlling the duty cycle D2 of the second power switch S2, the series connection of the second power switch S2 and the capacitor C1 is equivalent to an equivalent capacitor Ca with a controllable capacitance value, and Ca = D2 * C1. Adopting the variable - parameter T - type filter can dynamically adjust the equivalent capacitor Ca according to different real - time requirements to filter out different harmonics, perform impedance matching, and adjust dynamic stability; Variable circuit topology IV - LaC series type of the first variable filter: Both the first power switch S1 and the second power switch S2 are closed, then points A and C are the same point. The first variable filter is equivalent to an LC series connection: The first inductor L1 and the second inductor L2 are connected in parallel and then equivalent to an inductor La connected between points C and D, and La = L1 / / L2. The first capacitor C1 is connected in series with the inductor La, and the first capacitor C1 is connected between points D and B; In this working condition, this LaC series type is designed as a notch filter.

3. A wireless power transmission system with variable topology according to claim 1, characterized in that, The second variable filter has the ability of topology transformation. According to the different working states of the third power switch S3 and the fourth power switch S4, the second variable filter has 4 kinds of variable topologies, specifically: Variable circuit topology I - inductive type of the second variable filter: Both the third power switch S3 and the fourth power switch S4 are always off, then the second variable filter is equivalent to only the third inductor L3 and the fourth inductor L4 being connected to the circuit. Adopting the inductive type means that only inductors are required for this working condition at this time; Variable circuit topology II - short - circuit type of the second variable filter: The third power switch S3 is closed while the fourth power switch S4 is off, then the second variable filter is equivalent to a wire. Adopting the short - circuit type means that no filter is required for the corresponding working condition; The variable circuit topology Ⅲ of the second variable filter - variable Cr - T - type filter: When the third power switch S3 is turned off and the fourth power switch S4 is controlled to be turned on and off, the second variable filter is equivalent to a T - type filter: The third inductor L3 is connected between points U and V, the fourth inductor L4 is connected between points V and M, the fourth power switch S4 is connected in series with the second capacitor C2 and then connected between points V and N. By controlling the duty cycle D4 of the fourth power switch S4, the series connection of the fourth power switch S4 and the second capacitor C2 is equivalent to an equivalent capacitor Cr with a controllable capacitance value, and Cr = D4 * C2. Using the variable - parameter T - type filter type can dynamically adjust the equivalent capacitor Cr according to different real - time needs to filter different harmonics, perform impedance matching, and adjust dynamic stability; The variable circuit topology Ⅳ of the second variable filter - LrC series type: When the third power switch S3 and the fourth power switch S4 are closed, points U and M are the same point, and the second variable filter is equivalent to an LC series connection: The third inductor L3 and the fourth inductor L4 are connected in parallel and then equivalent to an inductor Lr connected between points C and D, and Lr = L3 / / L4. The second capacitor C2 is connected in series with the variable - parameter equivalent inductor, and the second capacitor C2 is connected between points V and N; This LrC series type is designed as a notch filter.

4. A wireless power transmission system with variable topology according to claim 2, wherein, Among them, when the energy flows from the AB - side of the port to the MN - side of the port: The variable circuit topology Ⅰ of the first variable filter - inductor type and the first H - bridge form a boost circuit at this time, which is suitable for application scenarios where the input current needs to be stable and boost is required; The variable circuit topology Ⅱ of the first variable filter - short - circuit type and the first H - bridge form a buck circuit at this time, which is suitable for application scenarios where no filter is required; The variable circuit topology Ⅲ of the first variable filter - variable Ca - T - type filter and the first H - bridge form a boost circuit at this time, which is suitable for dynamically adjusting the equivalent capacitor Ca according to different real - time needs to filter different harmonics, as well as performing input impedance matching and dynamic stability adjustment; The variable circuit topology Ⅳ of the first variable filter - LaC series type is a notch filter with a resonant frequency fa = 1 / [2π(La * C)^0.5] and forms a buck circuit with the first H - bridge at this time, which is suitable for filtering harmonics with frequencies near the resonant frequency fa. When the energy flows from the MN - side of the port to the AB - side of the port, both the first H - bridge and the first variable filter form a buck circuit: The variable circuit topology Ⅰ of the first variable filter - inductor type is suitable for application scenarios where the output current needs to be stable and the requirement for output voltage ripple is not high; The variable circuit topology Ⅱ of the first variable filter - short - circuit type circuit is suitable for application scenarios where no filter is required; The variable circuit topology Ⅲ of the first variable filter - variable Ca - T - type filter is suitable for application scenarios where the equivalent capacitor Ca is dynamically adjusted according to different real - time needs to filter different harmonics, and application scenarios where the input impedance matching and dynamic stability adjustment are performed by dynamically adjusting the equivalent capacitor Ca; The variable circuit topology Ⅳ of the first variable filter - LaC series type is suitable for forming a specific - frequency notch filter at the resonant frequency fa = 1 / [2π(La * C)^0.5].

5. A wireless power transmission system with variable topology according to claim 3, characterized in that, Among them, When the energy flows from the MN - side of the port to the AB - side of the port: The variable circuit topology Ⅰ of the second variable filter - the inductive type and the second H-bridge form a boost circuit at this time, which is applicable to the application scenarios where the input current needs to be stable and boost is required; The variable circuit topology Ⅱ of the second variable filter - the short-circuit type and the second H-bridge form a buck circuit at this time, which is applicable to the application scenarios without any filter; The variable circuit topology Ⅲ of the second variable filter - the variable Cr-T filter type and the second H-bridge form a boost circuit at this time, which is applicable to: the application scenarios of filtering by dynamically regulating the equivalent capacitance Cr according to different real-time harmonics, and the application scenarios of input impedance matching and dynamic stability regulation by dynamically regulating the equivalent capacitance Cr; The variable circuit topology Ⅳ of the second variable filter - the LrC series type is a notch filter with a resonant frequency fr = 1 / [2π(Lr*C)^0.5], which is applicable to filtering the frequency harmonics near the resonant frequency fr; When the energy flows from the AB side of the port to the MN side of the port, both the second H-bridge and the second variable filter form a buck circuit: The variable circuit topology Ⅰ of the second variable filter - the inductive type is applicable to the application scenarios where the output current needs to be stable and the requirement for the output voltage ripple is not high; The variable circuit topology Ⅱ of the second variable filter - the short-circuit type is applicable to the application scenarios without any filter; The variable circuit topology Ⅲ of the second variable filter - the variable Cr-T filter type is applicable to dynamically regulating the equivalent capacitance Cr according to different real-time needs to filter different harmonics and perform input impedance matching and dynamic stability regulation; The variable circuit topology Ⅳ of the second variable filter - the LrC series type is a notch filter with a resonant frequency fr = 1 / [2π(Lr*C)^0.5], which is applicable to filtering the frequency harmonics near the resonant frequency fr.

6. A wireless power transmission system with variable topology according to claim 1, characterized in that The first H-bridge has the ability to transform multiple working conditions, specifically including: When the energy flows from the AB side of the port to the MN side of the port: When the voltage u1 of the port AB is AC, the first H-bridge performs a direct AC-AC conversion to excite the wireless power transmission module; When the voltage u1 of the port AB is DC, the first H-bridge performs an inversion to excite the wireless power transmission module; When the energy flows from the MN side of the port to the AB side of the port: When the voltage u1 of the left port AB is AC, the first H-bridge performs a direct AC-AC conversion; When the voltage u1 of the left port AB is DC, the first H-bridge performs an active rectification.

7. A wireless power transmission system with variable topology according to claim 1, characterized in that, The second H-bridge has the ability to transform multiple working conditions, specifically including: When the energy flows from the AB side of the port to the MN side of the port: When the voltage u2 of the port MN is AC, the second H-bridge performs a direct AC-AC conversion; When the voltage u2 of the port MN is DC, the second H-bridge performs an active rectification; When the energy flows from the MN side of the port to the AB side of the port: When the voltage u2 of the port MN is AC, the second H-bridge performs a direct AC-AC conversion to excite the wireless power transmission module; When the voltage u2 of the port MN is DC, the second H-bridge performs an inversion to excite the wireless power transmission module.

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