Transmitting side circuit of multi-series inverter wireless power transmission system and circuit parameter design method

Abstract

The invention discloses a transmitting side circuit of a multi-series inverter wireless power transmission system and a circuit parameter design method, and belongs to the technical field of wireless power transmission. The invention aims to solve the problem of magnetic field coupling among multiple transmitting coils in a multi-transmitting-coil and multi-series inverter structure. The transmitting side circuit comprises a plurality of inverters which are connected in series in the same direction, each inverter comprises two switch tubes and a filter capacitor, and the two switch tubes are connected in series in the same direction and then connected with the filter capacitor in parallel; each transmitting branch is formed by connecting a transmitting coil and a compensation capacitor in series; the capacitor end of each transmitting branch is correspondingly connected with the midpoint of a bridge arm of an inverter, and the coil ends of the transmitting branches are converged at one point and then are connected with a filter capacitor of the inverter through at least one decoupling impedor. According to the invention, the anti-offset capability of the system is improved.

Description

Technical Field

[0001] This invention relates to the transmitter-side circuit and circuit parameter design method of a wireless power transfer system with multiple series inverters, and belongs to the field of wireless power transfer technology. Background Technology

[0002] Wireless Power Transfer (WPT) technology, with its contactless power transmission characteristics, overcomes the limitations of traditional conductor connections. While ensuring safety, it significantly improves power supply convenience and has demonstrated significant application value in fields such as dynamic charging of electric vehicles, seamless battery life for consumer electronics devices, long-term power supply for medical implants, power supply for underwater equipment, and deep space exploration. Among these, electromagnetic induction-based wireless power transfer technology, with its extensive research and broad application adaptability, has become the most mature and actively used mainstream solution in the current wireless power supply field. This technology is based on Faraday's law of electromagnetic induction and achieves energy transfer through the magnetic field coupling of a loosely coupled transformer. In practical applications, the transmitting and receiving coils of the loosely coupled transformer inevitably experience misalignment, leading to a decrease in the coupling coefficient and affecting transmission power and efficiency.

[0003] To improve the system's anti-offset capability, decoupled dual-coil structures, such as DDQ and BP type coils, have been studied. These are multi-pole magnetic field coils, meaning the magnetic field direction is not unidirectional. Natural decoupling of the magnetic circuit can effectively suppress cross-coupling and avoid reactive components, but it limits the coil size and design freedom. Furthermore, in practical applications, different manufacturers' chargers and charging objects may have different coil types, which limits the compatibility and interoperability of wireless charging. Figure 1 As shown. Because the coupling coefficient of multipole magnetic field coils (such as DD type) and unipole magnetic field coils (such as Q type) is zero when aligned, energy cannot be transferred. For WPT systems with constant current output, a zero coupling coefficient may cause the transmitter power to spike and damage the circuit. In summary, wireless power transfer systems with both offset resistance and interoperability urgently need to be studied. Summary of the Invention

[0004] To address the magnetic field coupling problem among multiple transmitting coils in a multi-series inverter structure, this invention provides a transmitter-side circuit and circuit parameter design method for a wireless power transmission system for multi-series inverters.

[0005] The present invention discloses a transmitter-side circuit of a multi-series inverter wireless power transmission system, comprising multiple inverters connected in series in the same direction, each inverter comprising two switching transistors and a filter capacitor, wherein the two switching transistors are connected in series in the same direction and then connected in parallel with the filter capacitor.

[0006] It also includes multiple transmitting branches, each of which consists of a transmitting coil and a compensation capacitor connected in series; the capacitor terminal of each transmitting branch is connected to the midpoint of an inverter bridge arm, and the coil terminals of each transmitting branch converge at one point and are connected to the inverter's filter capacitor through at least one decoupling impedance.

[0007] According to the transmitter-side circuit of the multi-series inverter wireless power transmission system of the present invention, there are two inverters and two corresponding transmitter branches;

[0008] The same-name terminals of the two transmitting coils are each connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, and the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the opposite-name terminals of the two transmitting coils are connected together as the opposite-name terminal connection point.

[0009] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most three impedance branches:

[0010] The first impedance branch includes a decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes a decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes a decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the second inverter.

[0011] According to the transmitter-side circuit of the multi-series inverter wireless power transmission system of the present invention, there are three inverters and three corresponding transmitter branches;

[0012] Each of the three transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, and the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; the non-named terminals of the three transmitting coils are connected together as a non-named terminal connection point.

[0013] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most four impedance branches:

[0014] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the third inverter.

[0015] According to the transmitter-side circuit of the multi-series inverter wireless power transmission system of the present invention, there are three inverters and three corresponding transmitter branches;

[0016] Each of the three transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, and the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; the non-identical terminals of the transmitting coils of the second and third transmitting branches are connected together and then connected to the decoupling impedance Z. 23 One end is connected to the decoupling impedance Z. 23 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point;

[0017] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most four impedance branches:

[0018] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the third inverter.

[0019] According to the present invention, the transmitter-side circuit of the multi-series inverter wireless power transmission system comprises four inverters and four corresponding transmitter branches;

[0020] Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter, and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter; the capacitor terminals of the four transmitting coils with different names are connected together as the connection point of different names.

[0021] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches:

[0022] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

[0023] According to the present invention, the transmitter-side circuit of the multi-series inverter wireless power transmission system comprises four inverters and four corresponding transmitter branches;

[0024] Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the second, third, and fourth transmitting branches are connected together and then connected to the decoupling impedance Z. 234 One end is connected to the decoupling impedance Z. 234 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point;

[0025] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches:

[0026] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

[0027] According to the present invention, the transmitter-side circuit of the multi-series inverter wireless power transmission system comprises four inverters and four corresponding transmitter branches;

[0028] Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the first and second transmitting branches are connected together and then connected to the decoupling impedance Z. 12 One end is connected, and the opposite ends of the transmitting coils of the third and fourth transmitting branches are connected together with the decoupling impedance Z. 34 One end is connected to the decoupling impedance Z. 12 The other end is connected to the decoupling impedance Z 34 The other ends are connected together as heteronymous connection points;

[0029] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches:

[0030] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

[0031] According to the present invention, the transmitter-side circuit of the multi-series inverter wireless power transmission system comprises four inverters and four corresponding transmitter branches;

[0032] Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the third and fourth transmitting branches are connected together and then connected to the decoupling impedance Z. 34 One end is connected to the decoupling impedance Z. 34 The other end is connected to the opposite end of the transmitting coil of the second transmitting branch, and then connected to the decoupling impedance Z. 34,2 One end is connected to the decoupling impedance Z. 34,2 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point;

[0033] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches:

[0034] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

[0035] This invention also provides a circuit parameter design method for the transmitter-side circuit of a multi-series inverter wireless power transfer system. For the transmitter-side circuit of the first type of multi-series inverter wireless power transfer system, the decoupling impedance design method is as follows:

[0036]

[0037] In the formula Z M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2;

[0038] The compensation capacitor satisfies:

[0039]

[0040] In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 M is the impedance of the transmitting coil L1 in the first transmitting branch. 12 Z is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 The impedance of the transmitting coil L2 in the second transmitting branch;

[0041] For the transmitter-side circuit of the second type of multi-series inverter wireless power transfer system, the design method for the decoupling impedance is as follows:

[0042]

[0043] In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2. M13Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M23 The mutual inductance impedance of the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3;

[0044] For the transmitter-side circuit of the third type of multi-series inverter wireless power transfer system, the design method for the decoupling impedance is as follows:

[0045]

[0046] In the formula Z M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2;

[0047] In the transmitter-side circuits of the first to third types of multi-series inverter wireless power transfer systems, the design method for the compensation capacitors is the same, satisfying the following:

[0048]

[0049] In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 M is the impedance of the transmitting coil L1 in the first transmitting branch. 12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch; C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 M is the impedance of the transmitting coil L3 in the third transmitting branch. 13 This refers to the mutual inductance between the transmitting coil L1 of the first transmitting branch and the transmitting coil L3 of the third transmitting branch.

[0050] This invention also provides a method for designing circuit parameters for the transmitter-side circuit of a multi-series inverter wireless power transfer system.

[0051] For the transmitter-side circuit of the fourth type of multi-series inverter wireless power transfer system, the design method for the decoupling impedance is as follows:

[0052]

[0053] In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2.M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M34 The mutual inductance impedance of the third transmitting branch transmitting coil L3 and the fourth transmitting branch transmitting coil L4;

[0054] The design method for the decoupling impedance of the transmitter-side circuit of the fifth type of multi-series inverter wireless power transfer system is as follows:

[0055]

[0056] In the formula Z M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2;

[0057] The design method for the decoupling impedance of the transmitter-side circuit of the sixth type of multi-series inverter wireless power transfer system is as follows:

[0058]

[0059] In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2. M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4.M24 The mutual inductance impedance of the second transmitting branch transmitting coil L2 and the fourth transmitting branch transmitting coil L4;

[0060] The design method for the decoupling impedance of the transmitter-side circuit of the seventh type of multi-series inverter wireless power transfer system is as follows:

[0061]

[0062] In the formula Z M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2;

[0063] In the transmitter-side circuits of the fourth, fifth, and seventh types of multi-series inverter wireless power transfer systems, the design method for the compensation capacitors is the same, satisfying the following:

[0064]

[0065] In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 Z represents the impedance of the transmitting coil L1 in the first transmitting branch. M12 M is the mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch; C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 Z is the impedance of the transmitting coil L3 in the third transmitting branch. M13 M is the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 14 For the mutual inductance of the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4, ZC4 Z is the impedance of the compensation capacitor C4 in the fourth transmitting branch. L4 Z is the impedance of the transmitting coil L4 in the fourth transmitting branch. M14 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4;

[0066] In the transmitter-side circuit of the sixth type of multi-series inverter wireless power transfer system, the design method of the compensation capacitor satisfies:

[0067]

[0068] In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 Z represents the impedance of the transmitting coil L1 in the first transmitting branch. M12 M is the mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch; C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 Z is the impedance of the transmitting coil L3 in the third transmitting branch. M13 M is the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. 34 The mutual inductance of the third transmitting branch transmitting coil L3 and the fourth transmitting branch transmitting coil L4; Z C4 Z is the impedance of the compensation capacitor C4 in the fourth transmitting branch. L4 Z is the impedance of the transmitting coil L4 in the fourth transmitting branch. M14 The mutual inductance impedance is the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4.

[0069] Beneficial effects of the invention: Based on the establishment of a multi-transmitter coil connection configuration on the transmitting side, the present invention can obtain a wireless power transfer system with strong anti-offset and interoperability of multi-transmitter coil multi-series inverters.

[0070] In the transmitting-side circuit described in this invention, multiple transmitting coils do not require mutual decoupling design; decoupling can be achieved through passive components, thus providing a high degree of freedom in coil design.

[0071] The method of this invention can sum the absolute values ​​of multiple mutual inductances between the primary and secondary edges, improving the system's resistance to offset. Simultaneously, this method can improve the system's interoperability and compatibility, and is beneficial for lightweighting the secondary edges. Attached Figure Description

[0072] Figure 1 This is a schematic diagram of coil interoperability;

[0073] Figure 2 This is a schematic diagram of the transmitter and receiver circuits of the first multi-series inverter wireless power transmission system. The transmitter circuit includes two inverters.

[0074] Figure 3 This is a schematic diagram of the transmitter and receiver circuits of the second type of multi-series inverter wireless power transmission system. The transmitter circuit includes three inverters.

[0075] Figure 4 This is a schematic diagram of the transmitter and receiver circuits of the third type of multi-series inverter wireless power transmission system. The transmitter circuit includes three inverters.

[0076] Figure 5 This is a schematic diagram of the transmitter and receiver circuits of the fourth type of multi-series inverter wireless power transmission system. The transmitter circuit includes four inverters.

[0077] Figure 6 This is a schematic diagram of the transmitter and receiver circuits of the fifth type of multi-series inverter wireless power transmission system. The transmitter circuit includes four inverters.

[0078] Figure 7 This is a schematic diagram of the transmitter and receiver circuits of the sixth type of multi-series inverter wireless power transmission system. The transmitter circuit includes four inverters.

[0079] Figure 8 This is a schematic diagram of the transmitter and receiver circuits of the seventh type of multi-series inverter wireless power transmission system. The transmitter circuit includes four inverters.

[0080] Figure 9 This is a schematic diagram of the magnetic coupling mechanism in the verification experiment;

[0081] Figure 10 This is the circuit diagram of the WPT system in the verification experiment;

[0082] Figure 11 This is a graph showing the change in mutual inductance with respect to offset distance in the verification experiment;

[0083] Figure 12 This is a schematic diagram of the driving signal in the verification experiment;

[0084] Figure 13 This is the output voltage variation curve with load when the transmitting coil and the receiving coil are aligned in the simulation experiment;

[0085] Figure 14It is the curve of output voltage changing with load when the transmitting coil and the receiving coil are offset in the simulation experiment. Detailed Implementation

[0086] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0087] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0088] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0089] Specific Implementation Method 1: Combination Figures 1 to 8 As shown, the first aspect of the present invention provides a transmitter-side circuit for a wireless power transmission system with multiple inverters connected in series in the same direction, including multiple inverters connected in series in the same direction, each inverter including two switching transistors and a filter capacitor, the two switching transistors being connected in series in the same direction and then connected in parallel with the filter capacitor;

[0090] It also includes multiple transmitting branches, each of which consists of a transmitting coil and a compensation capacitor connected in series; the capacitor terminal of each transmitting branch is connected to the midpoint of an inverter bridge arm, and the coil terminals of each transmitting branch converge at one point and are connected to the inverter's filter capacitor through at least one decoupling impedance.

[0091] The circuit diagram of the WPT system based on a multi-emitting coil multi-series inverter in this embodiment is as follows: Figures 2 to 8 As shown, commonly used transmitting coils are two-coil, three-coil, and four-coil. Three-coil coils include two cases, and four-coil coils include four cases. Other cases can be constructed by adding differential-mode inductors or common-mode inductors. Figures 2 to 8 Similar situations exist. For cases with more than four transmitting coils, it can be determined according to... Figures 2 to 8 The form is analogous.

[0092] First structure:

[0093] Combination Figure 2 As shown, there are two inverters, and two corresponding transmitter branches;

[0094] The same-name terminals of the two transmitting coils are each connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, and the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the opposite-name terminals of the two transmitting coils are connected together as the opposite-name terminal connection point.

[0095] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most three impedance branches:

[0096] The first impedance branch includes a decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes a decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes a decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the second inverter.

[0097] The second structure:

[0098] Combination Figure 3 As shown, there are three inverters, and three corresponding transmitter branches;

[0099] Each of the three transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, and the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; the non-named terminals of the three transmitting coils are connected together as a non-named terminal connection point.

[0100] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most four impedance branches:

[0101] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the third inverter.

[0102] In this structure, M 12 =M 13 =M 23 M 12 M is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 23This refers to the mutual inductance between the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3.

[0103] The third structure:

[0104] Combination Figure 4 As shown, there are three inverters, and three corresponding transmitter branches;

[0105] Each of the three transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, and the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; the non-identical terminals of the transmitting coils of the second and third transmitting branches are connected together and then connected to the decoupling impedance Z. 23 One end is connected to the decoupling impedance Z. 23 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point;

[0106] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most four impedance branches:

[0107] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the third inverter.

[0108] In this structure, M 12 =M 13 ≠M 23 M 12 M is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 23 This refers to the mutual inductance between the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3.

[0109] The fourth structure:

[0110] Combination Figure 5 As shown, there are four inverters, and four corresponding transmitter branches;

[0111] Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter, and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter; the capacitor terminals of the four transmitting coils with different names are connected together as the connection point of different names.

[0112] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches:

[0113] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

[0114] In this structure, M 12 =M 13 =M 14 =M 23 =M 24 =M 34 M 12 M is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 14 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4. 23 For the mutual inductance of the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3, M 24 M is the mutual inductance between the second transmitting branch transmitting coil L2 and the fourth transmitting branch transmitting coil L4. 34 This refers to the mutual inductance between the transmitting coil L3 of the third transmitting branch and the transmitting coil L4 of the fourth transmitting branch.

[0115] Fifth structure:

[0116] Combination Figure 6As shown, there are four inverters, and four corresponding transmitter branches;

[0117] Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the second, third, and fourth transmitting branches are connected together and then connected to the decoupling impedance Z. 234 One end is connected to the decoupling impedance Z. 254 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point;

[0118] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches:

[0119] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

[0120] In this structure, M 12 =M 13 =M 14 ≠M 23 =M 24 =M 34 M 12 M is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 14 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4. 23 For the mutual inductance of the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3, M 24 M is the mutual inductance between the second transmitting branch transmitting coil L2 and the fourth transmitting branch transmitting coil L4.34 This refers to the mutual inductance between the transmitting coil L3 of the third transmitting branch and the transmitting coil L4 of the fourth transmitting branch.

[0121] The sixth structure:

[0122] Combination Figure 7 As shown, there are four inverters, and four corresponding transmitter branches;

[0123] Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the first and second transmitting branches are connected together and then connected to the decoupling impedance Z. 12 One end is connected, and the opposite ends of the transmitting coils of the third and fourth transmitting branches are connected together with the decoupling impedance Z. 34 One end is connected to the decoupling impedance Z. 12 The other end is connected to the decoupling impedance Z 34 The other ends are connected together as heteronymous connection points;

[0124] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches:

[0125] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

[0126] In this structure, M 13 =M 23 =M 14 =M 24 ≠M 12 M 13 =M 23 =M 14 =M 24 ≠M34 M 12 M is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 14 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4. 23 For the mutual inductance of the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3, M 24 M is the mutual inductance between the second transmitting branch transmitting coil L2 and the fourth transmitting branch transmitting coil L4. 34 This refers to the mutual inductance between the transmitting coil L3 of the third transmitting branch and the transmitting coil L4 of the fourth transmitting branch.

[0127] The seventh structure:

[0128] Combination Figure 8 As shown, there are four inverters, and four corresponding transmitter branches;

[0129] Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the third and fourth transmitting branches are connected together and then connected to the decoupling impedance Z. 34 One end is connected to the decoupling impedance Z. 34 The other end is connected to the opposite end of the transmitting coil of the second transmitting branch, and then connected to the decoupling impedance Z. 34,2 One end is connected to the decoupling impedance Z. 34,2 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point;

[0130] The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches:

[0131] The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

[0132] In this structure, M 34 ≠M 24 =M 23 ≠M 14 =M 13 =M 12 M 12 M is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 14 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4. 23 For the mutual inductance of the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3, M 24 M is the mutual inductance between the second transmitting branch transmitting coil L2 and the fourth transmitting branch transmitting coil L4. 34 This refers to the mutual inductance between the transmitting coil L3 of the third transmitting branch and the transmitting coil L4 of the fourth transmitting branch.

[0133] Specific Implementation Method Two: Combination Figures 2 to 4 As shown, a second aspect of the present invention also provides a method for designing circuit parameters for the transmitter-side circuit of a multi-series inverter wireless power transfer system.

[0134] (i) The design method for the decoupling impedance of the transmitter-side circuit of the first type of multi-series inverter wireless power transfer system in Specific Implementation Method 1 is as follows:

[0135]

[0136] In the formula Z M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2;

[0137] The compensation capacitor satisfies:

[0138]

[0139] In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 M is the impedance of the transmitting coil L1 in the first transmitting branch. 12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 The impedance of the transmitting coil L2 in the second transmitting branch;

[0140] (ii) For the transmitter-side circuit of the second type of multi-series inverter wireless power transfer system in Specific Implementation Method 1, the design method for the decoupling impedance is as follows:

[0141]

[0142] In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M23 The mutual inductance impedance of the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3;

[0143] For the transmitter-side circuit of the third type of multi-series inverter wireless power transfer system in Specific Implementation Method 1, the design method for the decoupling impedance is as follows:

[0144]

[0145] In the formula Z M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2;

[0146] In the transmitter-side circuits of the first to third types of multi-series inverter wireless power transfer systems in Specific Implementation Method 1, the design method for the compensation capacitors is the same, satisfying the following:

[0147]

[0148] In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 M is the impedance of the transmitting coil L1 in the first transmitting branch.12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch; C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 M is the impedance of the transmitting coil L3 in the third transmitting branch. 13 This refers to the mutual inductance between the transmitting coil L1 of the first transmitting branch and the transmitting coil L3 of the third transmitting branch.

[0149] Specific Implementation Method Three: Combination Figures 5 to 8 As shown, a third aspect of the present invention also provides a method for designing circuit parameters for the transmitter-side circuit of a multi-series inverter wireless power transfer system.

[0150] 1) For the transmitter-side circuit of the fourth type of multi-series inverter wireless power transfer system in Specific Implementation Method 1, the design method for the decoupling impedance is as follows:

[0151]

[0152] In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M34 The mutual inductance impedance of the third transmitting branch transmitting coil L3 and the fourth transmitting branch transmitting coil L4;

[0153] 2) For the transmitter-side circuit of the fifth type of multi-series inverter wireless power transfer system in Specific Implementation Method 1, the design method for the decoupling impedance is as follows:

[0154]

[0155] In the formula Z M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3.M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2;

[0156] 3) For the transmitter-side circuit of the sixth type of multi-series inverter wireless power transfer system in Specific Implementation Method 1, the design method for the decoupling impedance is as follows:

[0157]

[0158] In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2. M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M24 The mutual inductance impedance of the second transmitting branch transmitting coil L2 and the fourth transmitting branch transmitting coil L4;

[0159] 4) For the transmitter-side circuit of the seventh type of multi-series inverter wireless power transfer system in Specific Implementation Method 1, the design method for the decoupling impedance is as follows:

[0160]

[0161] In the formula Z M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2;

[0162] In the transmitter-side circuit of the multi-series inverter wireless power transfer system described in any of the fourth, fifth, and seventh embodiments of Specific Implementation One, the design method of the compensation capacitor is the same, satisfying the following:

[0163]

[0164] In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 Z represents the impedance of the transmitting coil L1 in the first transmitting branch. M12 M is the mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch; C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 Z is the impedance of the transmitting coil L3 in the third transmitting branch. M13 M is the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 14 For the mutual inductance of the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4, Z C4 Z is the impedance of the compensation capacitor C4 in the fourth transmitting branch. L4 Z is the impedance of the transmitting coil L4 in the fourth transmitting branch. M14 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4;

[0165] In the transmitter-side circuit of the sixth type of multi-series inverter wireless power transfer system in Specific Implementation Method 1, the design method of the compensation capacitor satisfies:

[0166]

[0167] In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 Z represents the impedance of the transmitting coil L1 in the first transmitting branch. M12 M is the mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch;C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 Z is the impedance of the transmitting coil L3 in the third transmitting branch. M13 M is the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. 34 The mutual inductance between the third transmitting branch transmitting coil L3 and the fourth transmitting branch transmitting coil L4; Z C4 Z is the impedance of the compensation capacitor C4 in the fourth transmitting branch. L4 Z represents the impedance of the transmitting coil L4 in the fourth transmitting branch. M14 The mutual inductance impedance is the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4.

[0168] In this invention, Z i It is an inductor or capacitor, and 1 / Z i The value can be 0 (i = 1~5). The above circuit can sum the absolute values ​​of the mutual inductances between the primary and secondary sides, that is... Where M PS It is the total equivalent mutual inductance of the primary and secondary sides, M si It is the receiving coil L s With transmitting coil L i Mutual induction between them (i = 1 to 4).

[0169] Verification experiment:

[0170] To illustrate the effectiveness of the present invention, the following experiments were conducted.

[0171] by Figure 2 Taking the case where the primary and secondary coils have the same external dimensions, the receiving coil is square with 12 turns, and the transmitting coil consists of two D coils, each with 11 turns, as follows: Figure 9 As shown. The compensation topology adopts an S / S approach, and the WPT system circuit diagram is as follows. Figure 10 As shown. Where U in This is the DC input voltage; Q1 to Q4 are the inverter switching transistors; C s C1 and C2 are compensation capacitors; L s L1 to L2 are the self-inductances of the secondary coil; L1 to L2 are the self-inductances of the primary coil; M s1 ~M s2 They are L s Mutual inductance between L1 and L2; M 12 It is the mutual inductance between the primary coils L1 and L2; D1 to D4 are rectifier diodes; C F C in1 C in2 It is a filter capacitor; R L It is the load resistance; U o and I oThese are the DC output voltage and current; Z1 to Z3 are the decoupling impedances. s i1 is the current of the secondary coil, i2 is the current of the primary coil L1, and i2 is the current of the primary coil L2.

[0172] exist Figure 10 In the middle, the parameter design method formula is changed from the original formula. It becomes the following formula:

[0173]

[0174] The compensation capacitor satisfies:

[0175]

[0176] When the transmission distance is 9.5cm, the curves showing the change in mutual inductance with respect to the offset along the x and y axes can be obtained, such as... Figure 11 As shown. Since the coil has a centrally symmetric structure, only the cases of x>0 and y>0 are shown. It can be seen that this method can increase the equivalent mutual inductance value during offset, thereby improving the system's anti-offset capability.

[0177] In fact, when M s1 ·M s2 <0, the structure proposed in this invention can switch the transmitting coil from a DD type to a square coil. This improves upon the shortcomings of DD coils, namely, poor resistance to offset in the x-axis direction. For example... Figure 11 As shown, the equivalent mutual inductance is reduced by 29.1%, while the traditional structure has a mutual inductance zero-crossing point.

[0178] To achieve the summation of the absolute values ​​of the mutual inductances, it is necessary to... si When the value is less than 0, the corresponding inverter switching transistor drive signal is inverted. For example, when x is offset by 10cm, M... s1 >0, M s2 <0, Inverter drive signal diagram as shown below Figure 12 As shown.

[0179] Simulation experiment:

[0180] To verify the anti-offset capability of the structure proposed in this invention, a simulation experiment based on S / S compensation topology was conducted. The circuit parameters of the WPT system are shown in Table 1, where f is the operating frequency of the transmitting circuit.

[0181] Table 1 Circuit Parameters

[0182]

[0183] The output voltage when the transmitting coil and receiving coil are aligned is as follows: Figure 13As shown, within a 10-fold load variation range, the output voltage dropped from 4.804V to 5.697V, with a fluctuation rate of 15.67%, confirming the load-independent constant current output characteristics of the S / S compensation topology.

[0184] The output voltage curves of the offset between the transmitting and receiving coils are as follows: Figure 14 As shown. With a rated load of 10Ω as a reference, the current drops by a maximum of 69.29% within a 40% offset of the coil x-axis length. For the S / S compensation topology, the output current is inversely proportional to the equivalent mutual inductance.

[0185] It should be noted that, although Figure 14 The output current fluctuation may seem large, but by optimizing the mutual inductance curve, a constant current output effect that is independent of the coupling state can be effectively achieved.

[0186] Since the equivalent mutual inductance is calculated by summing absolute values, the method proposed in this invention successfully overcomes the zero-crossing problem in the coupling process of multipolar coils, and this method enhances the compatibility between coils.

[0187] Eliminating zero-crossing during coupling also improves the safety performance of wireless power transmission systems. Taking a constant current output S / S compensation system as an example, zero-crossing problems during coupling can cause a sudden and sharp increase in power, which can damage the system.

[0188] In summary, the multi-coil multi-rectifier topology proposed in this invention can significantly improve the system's anti-offset capability and interoperability performance.

[0189] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A transmitter-side circuit for a multi-series inverter wireless power transfer system, comprising multiple inverters connected in series in the same direction, each inverter including two switching transistors and a filter capacitor, wherein the two switching transistors are connected in series in the same direction and then in parallel with the filter capacitor; characterized in that, It also includes multiple transmitting branches, each of which consists of a transmitting coil and a compensation capacitor connected in series; the capacitor terminal of each transmitting branch is connected to the midpoint of an inverter bridge arm, and the coil terminals of each transmitting branch converge at one point and are connected to the inverter's filter capacitor through at least one decoupling impedance.

2. The transmitter-side circuit of the multi-series inverter wireless power transfer system according to claim 1, characterized in that, There are two inverters, and two corresponding transmitter branches; The same-name terminals of the two transmitting coils are each connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, and the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the opposite-name terminals of the two transmitting coils are connected together as the opposite-name terminal connection point. The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most three impedance branches: The first impedance branch includes a decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes a decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes a decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the second inverter.

3. The transmitter-side circuit of the multi-series inverter wireless power transfer system according to claim 1, characterized in that, There are three inverters, and three corresponding transmitter branches; Each of the three transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, and the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; the non-named terminals of the three transmitting coils are connected together as a non-named terminal connection point. The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most four impedance branches: The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the third inverter.

4. The transmitter-side circuit of the multi-series inverter wireless power transfer system according to claim 1, characterized in that, There are three inverters, and three corresponding transmitter branches; Each of the three transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, and the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; the non-identical terminals of the transmitting coils of the second and third transmitting branches are connected together and then connected to the decoupling impedance Z. 23 One end is connected to the decoupling impedance Z. 23 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point; The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most four impedance branches: The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the third inverter.

5. The transmitter-side circuit of the multi-series inverter wireless power transfer system according to claim 1, characterized in that, There are four inverters, and four corresponding transmitter branches; Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter, the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter, the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter, and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter; the capacitor terminals of the four transmitting coils with different names are connected together as the connection point of different names. The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches: The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

6. The transmitter-side circuit of the multi-series inverter wireless power transfer system according to claim 1, characterized in that, There are four inverters, and four corresponding transmitter branches; Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the second, third, and fourth transmitting branches are connected together and then connected to the decoupling impedance Z. 234 One end is connected to the decoupling impedance Z. 234 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point; The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches: The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

7. The transmitter-side circuit of the multi-series inverter wireless power transfer system according to claim 1, characterized in that, There are four inverters, and four corresponding transmitter branches; Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the first and second transmitting branches are connected together and then connected to the decoupling impedance Z. 12 One end is connected, and the opposite ends of the transmitting coils of the third and fourth transmitting branches are connected together with the decoupling impedance Z. 34 One end is connected to the decoupling impedance Z. 12 The other end is connected to the decoupling impedance Z 34 The other ends are connected together as heteronymous connection points; The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches: The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

8. The transmitter-side circuit of the wireless power transfer system for multiple series inverters according to claim 1, characterized in that, There are four inverters, and four corresponding transmitter branches; Each of the four transmitting coils with the same name is connected to a compensation capacitor; the capacitor terminal of the first transmitting branch is connected to the midpoint of the bridge arm of the first inverter; the capacitor terminal of the second transmitting branch is connected to the midpoint of the bridge arm of the second inverter; the capacitor terminal of the third transmitting branch is connected to the midpoint of the bridge arm of the third inverter; and the capacitor terminal of the fourth transmitting branch is connected to the midpoint of the bridge arm of the fourth inverter. The non-identical terminals of the transmitting coils of the third and fourth transmitting branches are connected together and then connected to the decoupling impedance Z. 34 One end is connected to the decoupling impedance Z. 34 The other end is connected to the opposite end of the transmitting coil of the second transmitting branch, and then connected to the decoupling impedance Z. 34,2 One end is connected to the decoupling impedance Z. 34,2 The other end is connected to the opposite end of the transmitting coil of the first transmitting branch as an opposite end connection point; The non-nominal connection point is connected to the inverter's filter capacitor through at least one and at most five impedance branches: The first impedance branch includes decoupling impedance Z1, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the first inverter; the second impedance branch includes decoupling impedance Z2, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the second inverter; the third impedance branch includes decoupling impedance Z3, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the third inverter; the fourth impedance branch includes decoupling impedance Z4, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the negative terminal of the filter capacitor of the fourth inverter; the fifth impedance branch includes decoupling impedance Z5, one end of which is connected to the opposite-name terminal connection point, and the other end of which is connected to the positive terminal of the filter capacitor of the fourth inverter.

9. A method for designing circuit parameters for the transmitter-side circuit of a multi-series inverter wireless power transfer system, characterized in that, (i) For the transmitter-side circuit of the wireless power transfer system with multiple series inverters as described in claim 2, the design method for the decoupling impedance is as follows: In the formula Z M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; The compensation capacitor satisfies: In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 M is the impedance of the transmitting coil L1 in the first transmitting branch. 12 Z is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 The impedance of the transmitting coil L2 in the second transmitting branch; (ii) For the transmitter-side circuit of the wireless power transfer system with multiple series inverters as described in claim 3, the design method for the decoupling impedance is as follows: In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M23 The mutual inductance impedance of the second transmitting branch transmitting coil L2 and the third transmitting branch transmitting coil L3; For the transmitter-side circuit of the multi-series inverter wireless power transfer system as described in claim 4, the design method for the decoupling impedance is as follows: In the formula Z M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; In the transmitter-side circuit of the multi-series inverter wireless power transfer system as described in claim 3 or 4, the design method for the compensation capacitor is the same, satisfying the following: In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 M is the impedance of the transmitting coil L1 in the first transmitting branch. 12 Z is the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch; C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 M is the impedance of the transmitting coil L3 in the third transmitting branch. 13 This refers to the mutual inductance between the transmitting coil L1 of the first transmitting branch and the transmitting coil L3 of the third transmitting branch.

10. A method for designing circuit parameters for the transmitter-side circuit of a multi-series inverter wireless power transfer system, characterized in that, 1) For the transmitter-side circuit of the multi-series inverter wireless power transfer system as described in claim 5, the design method for the decoupling impedance is as follows: In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M34 The mutual inductance impedance of the third transmitting branch transmitting coil L3 and the fourth transmitting branch transmitting coil L4; 2) For the transmitter-side circuit of the multi-series inverter wireless power transfer system as described in claim 6, the design method for the decoupling impedance is as follows: In the formula Z M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; 3) For the transmitter-side circuit of the multi-series inverter wireless power transfer system as described in claim 7, the design method for the decoupling impedance is as follows: In the formula Z M12 Z represents the mutual inductance impedance of the first transmitting branch coil L1 and the second transmitting branch coil L2. M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M24 The mutual inductance impedance of the second transmitting branch transmitting coil L2 and the fourth transmitting branch transmitting coil L4; 4) For the transmitter-side circuit of the multi-series inverter wireless power transfer system as described in claim 8, the design method for the decoupling impedance is as follows: In the formula Z M34 Z represents the mutual inductance impedance between the third transmitting branch coil L3 and the fourth transmitting branch coil L4. M24 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the fourth transmitting branch coil L4. M23 Z represents the mutual inductance impedance between the second transmitting branch coil L2 and the third transmitting branch coil L3. M14 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the fourth transmitting branch coil L4. M13 Z represents the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. M12 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; In the transmitter-side circuit of the wireless power transfer system for multi-series inverters as described in any one of claims 5, 6, or 8, the design method for the compensation capacitor is the same, satisfying the following: In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 Z is the impedance of the transmitting coil L1 in the first transmitting branch. M12 M is the mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch; C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 Z is the impedance of the transmitting coil L3 in the third transmitting branch. M13 M is the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. 13 M is the mutual inductance between the first transmitting branch transmitting coil L1 and the third transmitting branch transmitting coil L3. 14 For the mutual inductance of the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4, Z C4 Z is the impedance of the compensation capacitor C4 in the fourth transmitting branch. L4 Z represents the impedance of the transmitting coil L4 in the fourth transmitting branch. M14 The mutual inductance impedance of the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4; In the transmitter-side circuit of the multi-series inverter wireless power transfer system according to claim 7, the design method of the compensation capacitor is the same, satisfying: In the formula Z C1 Z is the impedance of the compensation capacitor C1 in the first transmitting branch. L1 Z is the impedance of the transmitting coil L1 in the first transmitting branch. M12 M is the mutual inductance impedance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2. 12 Z represents the mutual inductance of the first transmitting branch transmitting coil L1 and the second transmitting branch transmitting coil L2; C2 Z is the impedance of the compensation capacitor C2 in the second transmitting branch. L2 Z represents the impedance of the transmitting coil L2 in the second transmitting branch; C3 Z is the impedance of the third transmitting branch compensation capacitor C3. L3 Z is the impedance of the transmitting coil L3 in the third transmitting branch. M13 M is the mutual inductance impedance between the first transmitting branch coil L1 and the third transmitting branch coil L3. 34 The mutual inductance between the third transmitting branch transmitting coil L3 and the fourth transmitting branch transmitting coil L4; Z C4 Z is the impedance of the compensation capacitor C4 in the fourth transmitting branch. L4 Z represents the impedance of the transmitting coil L4 in the fourth transmitting branch. M14 The mutual inductance impedance is the first transmitting branch transmitting coil L1 and the fourth transmitting branch transmitting coil L4.

Images