Magnetic coupler, strong anti-offset electric vehicle wireless charging system and design method of strong anti-offset electric vehicle wireless charging system

Abstract

The invention discloses a magnetic coupler and strong anti-offset electric vehicle wireless charging system and a design method thereof, the magnetic coupler comprises a transmitting end and a receiving end, the receiving end comprises a receiving coil, the transmitting end comprises a compensation coil and a transmitting coil, the transmitting end and the receiving end are distributed in parallel, the transmitting end is of a structure shaped like a Chinese character'tian ', the compensation coil is formed by connecting two coil groups which are distributed diagonally in series, the transmitting coil is formed by connecting another two coil groups which are distributed diagonally in series, and the system and the design method thereof can solve the problems that the anti-offset capability is weak, the anti-offset capability has directivity, and the receiving end is difficult to arrange due to a complex structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless power transmission, and relates to a magnetic coupler and a highly anti-deviation wireless charging system for electric vehicles and a design method thereof. Background Art

[0002] In recent years, my country's electric vehicle industry has been unprecedentedly prosperous. At the same time, electric vehicle charging technology and infrastructure have made great progress. In addition to traditional conductive charging, the development of new wide bandgap power devices has also spawned wireless charging. Wireless charging based on wireless power transmission technology is convenient, safe and reliable. It can avoid wear and tear caused by frequent plugging and unplugging, and improve charging safety in rainy, snowy and humid environments. With the rise of driverless and smart car technology, wireless charging has become a powerful supplement to conductive charging and a future development trend.

[0003] At present, one of the biggest obstacles to the practical application of wireless charging systems is still the offset problem. Due to the limitation of parking accuracy, the relative offset between the transmitting and receiving ends of the system is difficult to avoid, and the mutual inductance between the transmitting and receiving coils is related to the offset position. A large range of coil offsets will cause drastic fluctuations in the system output power and transmission efficiency. In order to improve the anti-offset capability of wireless charging systems, existing solutions have proposed a series of methods to improve the anti-offset capability from the aspects of magnetic coupler design, compensation topology, compensation parameters, control strategy, etc.

[0004] For example, the use of a flat solenoid magnetic coupler can greatly improve the anti-offset capability of a wireless charging system in a certain horizontal direction. However, due to structural limitations, the impact of the two horizontal orthogonal offsets on the flat solenoid magnetic coupler is quite different, and the system's anti-offset capability in another horizontal direction is poor. It can be seen that the wireless charging system not only requires strong anti-offset capability, but also requires that the anti-offset capability cannot be directional. In addition, the wireless charging scenario of electric vehicles requires a simple and reliable system architecture and as few on-board receiving components as possible. It is difficult for existing anti-offset wireless charging system solutions to take into account both of the above requirements. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a magnetic coupler and a strong anti-drift electric vehicle wireless charging system and a design method thereof. The system and the design method thereof can solve the problems of weak anti-drift capability, directional anti-drift capability and difficult arrangement due to complex structure of the receiving end.

[0006] To achieve the above-mentioned purpose, the present invention discloses a magnetic coupler, comprising a transmitting end and a receiving end, wherein the receiving end comprises a receiving coil, the transmitting end comprises a compensation coil and a transmitting coil, the transmitting end and the receiving end are distributed in parallel, and the transmitting end is a field-shaped structure, wherein the compensation coil is composed of two diagonally distributed coil groups connected in series, and the transmitting coil is composed of two other diagonally distributed coil groups connected in series.

[0007] Furthermore, the receiving coil is a planar square coil.

[0008] Further, an end face of the transmitting end corresponds to an end face of the receiving end, wherein each end face of the transmitting end is flush with the corresponding end face of the receiving end.

[0009] Furthermore, the center point of the transmitting end and the center end of the receiving end are located on the same vertical line.

[0010] Furthermore, the compensation coil is wound by upper and lower layers of coils.

[0011] Furthermore, the transmitting coil is wound with two layers of coils, upper and lower.

[0012] The present invention discloses a strong anti-drift wireless charging system for electric vehicles, which is characterized by comprising a system AC power supply, a compensation coil series compensation capacitor, a transmitting end parallel compensation capacitor, a transmitting coil series compensation capacitor, a receiving coil compensation capacitor, a system load and a magnetic coupler;

[0013] A series branch formed by the compensation coil, the system AC power supply and the compensation coil series compensation capacitor is connected in parallel with a series branch formed by the transmitting end parallel compensation capacitor and the transmitting coil series compensation capacitor and the transmitting coil;

[0014] One end of the receiving coil compensation capacitor is connected to the other end of the receiving coil compensation capacitor via the receiving coil and the system load.

[0015] The present invention discloses a design method for a strong anti-drift electric vehicle wireless charging system, comprising:

[0016] Determine the capacitance value of the compensation capacitor connected in series with the compensation coil;

[0017] Determine the corresponding relationship between the system AC power supply, the compensation coil series compensation capacitor, the transmitter parallel compensation capacitor, the transmitter coil series compensation capacitor and the receiving coil compensation capacitor;

[0018] According to the capacitance value of the compensation coil series compensation capacitor and the corresponding relationship between the system AC power supply, the compensation coil series compensation capacitor, the transmitting end parallel compensation capacitor, the transmitting coil series compensation capacitor and the receiving coil compensation capacitor, a strong anti-offset wireless charging system for electric vehicles is constructed.

[0019] Furthermore, the capacitance value of the compensation capacitor connected in series with the compensation coil is determined according to formula (1):

[0020] (L f ′R eq / M ps_n ) 2 +4ω 2 M fs_n 2 -(L f ′R eq / M ps_m ) 2 -4ω 2 M fs_m 2 =0(1)

[0021] Among them, M fp To compensate for the mutual inductance between the coil and the transmitting coil, M ps is the mutual inductance between the transmitting coil and the receiving coil, M fs To compensate for the mutual inductance between the coil and the receiving coil, M ps_n and M fs_n are the mutual inductance between the transmitting coil and the receiving coil and the mutual inductance between the compensation coil and the receiving coil when the magnetic coupler is facing each other, M ps_m and M fs_m are the mutual inductance between the transmitting coil and the receiving coil and the mutual inductance between the compensation coil and the receiving coil at the maximum offset distance of the magnetic coupler, L f ′=L f -M fp -1 / ω 2 C f ′.

[0022] Furthermore, the corresponding relationship between the system AC power supply, the compensation coil series compensation capacitor, the transmitter parallel compensation capacitor, the transmitter coil series compensation capacitor and the receiving coil compensation capacitor is:

[0023]

[0024] The present invention has the following beneficial effects:

[0025] In the specific operation of the magnetic coupler and the strong anti-offset electric vehicle wireless charging system and the design method thereof described in the present invention, the transmitting end includes a compensation coil and a transmitting coil, and the transmitting end is distributed in parallel with the receiving end. The compensation coil and the transmitting coil cooperate to make it have a strong anti-offset ability, and the anti-offset performance is not affected by the offset direction. Within a certain offset range, in addition, the present invention integrates the magnetic coupler into the electric vehicle wireless charging system, the overall structure of the system is relatively simple, and the vehicle-mounted receiving end of the system only needs a most basic coil and a compensation capacitor, and does not need a compensation inductor and other additional components, which is conducive to the lightweight receiving end of the electric vehicle wireless charging system, can achieve a higher receiving end power density, and facilitates the arrangement of vehicle-mounted components. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 is a structural diagram of a magnetic coupler;

[0028] Figure 2 It is a structural schematic diagram of the strong anti-drift electric vehicle wireless charging system of the present invention;

[0029] Figure 3 This is a test result diagram of Example 3. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0033] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0034] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0035] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0038] Embodiment 1

[0039] refer to Figure 1 The magnetic coupler of the present invention comprises a transmitting end and a receiving end, wherein the receiving end comprises a receiving coil L s The transmitting end includes a compensation coil L f And the transmitting coil L p , the receiving coil L s Located at the compensation coil L f And the transmitting coil L p , and the receiving end is distributed in parallel with the transmitting end.

[0040] The transmitting end is a field-shaped structure, and the compensation coil L f It consists of two coil groups connected in series and the transmitting coil L p It consists of two diagonally distributed coil groups connected in series.

[0041] The receiving coil L s It is a flat square coil.

[0042] The transmitting end and the receiving end are distributed in parallel, and one end face of the transmitting end corresponds to one end face of the receiving end, wherein each end face of the transmitting end and the corresponding end face of the receiving end are located in the same plane, and at the same time, the center point of the transmitting end and the center end of the receiving end are located on the same vertical line.

[0043] The design parameters of the magnetic coupler are shown in Table 1. s , transmitting coil L p And compensation coil L f The compensation coil L is tightly wound. f And the transmitting coil L p They are all wound with two layers of coils, upper and lower.

[0044] Embodiment 2

[0045] refer to Figure 2 This embodiment discloses a strong anti-drift electric vehicle wireless charging system including a system AC power supply U p , Compensation coil L f , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p , transmitting coil L p , receiving coil L s , receiving coil compensation capacitor C s and system load R eq ;

[0046] Compensation coil L f , System AC power supply U pAnd the compensation coil is connected in series with the compensation capacitor C f The series branch formed is connected in parallel with the transmitter end to compensate for the capacitor C f Connect the compensation capacitor C in series with the transmitting coil p And the transmitting coil L p The series branches formed are connected in parallel;

[0047] Receiving coil compensation capacitor C s One end of the receiving coil L s and system load R eq and the receiving coil compensation capacitor C s The other end is connected.

[0048] Embodiment 3

[0049] The design parameters of the magnetic coupler in this embodiment are shown in Table 1.

[0050] Table 1

[0051]

[0052] According to the design parameters in Table 1, a magnetic coupler was trial-produced, and the mutual inductance M of the magnetic coupler when facing each other was measured. fs_n and M ps_n The mutual inductance M is 36.2μH and 36.7μH respectively when the horizontal displacement is 200mm. fs_m and M ps_m They are 29.4μH and 30.3μH respectively. Based on this, under the system rated operating frequency of 85kHz and 10Ω load conditions, L is selected. f ' is 110μH, correspondingly, C f The value of ' is designed to be 21.53nF.

[0053] In view of the L of the prototype magnetic coupler obtained by actual measurement f , L p and L s The values ​​are 226.9μH, 235.2μH and 308.9μH respectively. Correspondingly, the compensation parameter C f , C p and C s They were designed to be 54.74nF, 20.48nF and 11.35nF respectively. A test prototype was built to test the system's anti-drift capability. The results are as follows Figure 3 As shown, it can be seen that the output power of the system remains basically constant within the range of 220mm horizontal offset and 50mm longitudinal offset, and it has strong anti-offset capability.

[0054] Embodiment 4

[0055] The design method of the strong anti-drift electric vehicle wireless charging system of the present invention includes:

[0056] Determine the compensation capacitor C in series with the compensation coil f 'Capacitance value;

[0057] Determine the system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s The corresponding relationship;

[0058] According to the compensation coil connected in series with the compensation capacitor C f 'capacitance value and system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s The corresponding relationship is used to build a strong anti-offset wireless charging system for electric vehicles.

[0059] As an implementation mode of the present invention, the compensation coil is connected in series with a compensation capacitor C f The capacitance value of ' is determined according to formula (1):

[0060] (L f ′R eq / M ps_n ) 2 +4ω 2 M fs_n 2 -(L f ′R eq / M ps_m ) 2 -4ω 2 M fs_m 2 =0(1)

[0061] Among them, M fp For the compensation coil L f With the transmitting coil L p The mutual inductance between ps The transmitting coil L p With receiving coil L s The mutual inductance between fs For the compensation coil L f With receiving coil L s The mutual inductance between ps_n and M fs_n When the magnetic coupler is facing, the transmitting coil L p and receiving coil L sThe mutual inductance between the coils L f The mutual inductance between the receiving coil and the ps_m and M fs_m They are respectively the transmitting coil L at the maximum offset distance of the magnetic coupler p and receiving coil L s The mutual inductance between the coils L f and receiving coil L s The mutual inductance between f ′=L f -M fp -1 / ω 2 C f ′.

[0062] As an implementation mode of the present invention, the system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s The corresponding relationship is:

[0063]

[0064] Embodiment 5

[0065] The design system of the strong anti-drift electric vehicle wireless charging system of the present invention includes:

[0066] The first determination module is used to determine the compensation coil series compensation capacitor C f 'Capacitance value;

[0067] The second determination module is used to determine the system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s The corresponding relationship;

[0068] Building blocks for connecting a compensation capacitor C in series with the compensation coil f 'capacitance value and system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s The corresponding relationship is used to build a strong anti-offset wireless charging system for electric vehicles.

[0069] As an implementation mode of the present invention, the compensation coil is connected in series with a compensation capacitor C f The capacitance value of ' is determined according to formula (1):

[0070] (L f ′R eq / M ps_n ) 2 +4ω 2 M fs_n 2 -(L f ′R eq / M ps_m ) 2 -4ω 2 M fs_m 2 =0

[0071] Among them, M fp For the compensation coil L f With the transmitting coil L p The mutual inductance between ps The transmitting coil L p With receiving coil L s The mutual inductance between fs For the compensation coil L f With receiving coil L s The mutual inductance between ps_n and M fs_n When the magnetic coupler is facing, the transmitting coil L p and receiving coil L s The mutual inductance between the coils L f The mutual inductance between the receiving coil and the ps_m and M fs_m They are respectively the transmitting coil L at the maximum offset distance of the magnetic coupler p and receiving coil L s The mutual inductance between the coils L f and receiving coil L s The mutual inductance between f ′=L f -M fp -1 / ω 2 C f ′.

[0072] As an implementation mode of the present invention, the system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s The corresponding relationship is:

[0073]

[0074] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0075] Embodiment 6

[0076] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the design method of the strong anti-drift electric vehicle wireless charging system are implemented, for example, including: determining the compensation coil series compensation capacitor C f 'Capacitance value; determine the system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s According to the corresponding relationship of the compensation coil in series with the compensation capacitor C f 'capacitance value and system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s The corresponding relationship is used to construct a strong anti-drift electric vehicle wireless charging system. Among them, the memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus, and the internal bus can be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard structure bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provides instructions and data to the processor.

[0077] Embodiment 7

[0078] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the design method of the strong anti-drift electric vehicle wireless charging system are implemented, for example, including: determining the compensation coil series compensation capacitor C f 'Capacitance value; determine the system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s According to the corresponding relationship of the compensation coil in series with the compensation capacitor C f 'capacitance value and system AC power supply U p , the compensation coil is connected in series with the compensation capacitor C f '、Transmitter parallel compensation capacitor C f , the transmitting coil is connected in series with the compensation capacitor C p And the receiving coil compensation capacitor C s The corresponding relationship is used to construct a strong anti-drift electric vehicle wireless charging system. Specifically, the computer-readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0079] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0080] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0081] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A magnetic coupler, characterized in that: It includes a transmitting end and a receiving end, wherein the receiving end includes a receiving coil (L s ), the transmitting end includes a compensation coil (L f ) and the transmitting coil (L p ), the transmitting end and the receiving end are arranged in parallel, the transmitting end is a field-shaped structure, wherein the compensation coil (L f ) consists of two coil groups distributed diagonally in series, the transmitting coil (L p ) consists of two other diagonally distributed coil groups connected in series.

2. The magnetic coupler according to claim 1, characterized in that: The receiving coil (L s ) is a planar square coil.

3. The magnetic coupler according to claim 1, characterized in that: An end face of the transmitting end corresponds to an end face of the receiving end, wherein each end face of the transmitting end is flush with the corresponding end face of the receiving end.

4. The magnetic coupler according to claim 1, characterized in that: The center point of the transmitting end and the center end of the receiving end are located on the same vertical line.

5. The magnetic coupler according to claim 1, characterized in that: The compensation coil (L f ) is wound with two layers of coils, upper and lower.

6. The magnetic coupler according to claim 1, characterized in that: The transmitting coil (L p ) is wound with two layers of coils, upper and lower.

7. A highly anti-deviated wireless charging system for electric vehicles, characterized in that: Including system AC power supply (U p ), compensation coil in series with compensation capacitor (C f '), parallel compensation capacitor at the transmitting end (C f ), transmitting coil series compensation capacitor (C p ), receiving coil compensation capacitor (C s ), system load (R eq ) and the magnetic coupler according to any one of claims 1 to 6; Compensation coil (L f ), system AC power supply (U p ) and the compensation coil is connected in series with the compensation capacitor (C f ') and the parallel compensation capacitor (C f ) and the transmitting coil series compensation capacitor (C p ) and transmitting coil (L p ) are connected in parallel to form series branches; The receiving coil compensation capacitor (C s ) through the receiving coil (L s ) and system load (R eq ) and the receiving coil compensation capacitor (C s ) is connected to the other end.

8. A design method for a highly resistant electric vehicle wireless charging system as claimed in claim 7, characterized in that: include: Determine the compensation coil series compensation capacitor (C f ') capacitance value; Determine the system AC power supply (U p ), compensation coil in series with compensation capacitor (C f '), parallel compensation capacitor at the transmitting end (C f ), transmitting coil series compensation capacitor (C p ) and the receiving coil compensation capacitor (C s )’s corresponding relationship; According to the compensation coil connected in series with the compensation capacitor (C f ') and the capacitance value of the system AC power supply (U p ), compensation coil in series with compensation capacitor (C f '), parallel compensation capacitor at the transmitting end (C f ), transmitting coil series compensation capacitor (C p ) and the receiving coil compensation capacitor (C s ) to build a strong anti-offset wireless charging system for electric vehicles.

9. The design method of the strong anti-drift electric vehicle wireless charging system according to claim 8 is characterized in that: The compensation coil is connected in series with a compensation capacitor (C f The capacitance value of ') is determined according to formula (1): Among them, M fp For the compensation coil (L f ) and the transmitting coil (L p ) between the mutual inductance, M ps For the transmitting coil (L p ) and the receiving coil (L s ) between the mutual inductance, M fs For the compensation coil (L f ) and the receiving coil (L s ) between the mutual inductance, M ps_n and M fs_n When the magnetic coupler is facing, the transmitting coil (L p ) and the receiving coil (L s ) and the mutual inductance between the compensation coils (L f ) and the mutual inductance between the receiving coil, M ps_m and M fs_m They are respectively the maximum offset distance of the magnetic coupler, the transmitting coil (L p ) and the receiving coil (L s ) and the mutual inductance between the compensation coils (L f ) and the receiving coil (L s ) between the mutual inductance, L f ′=L f -M fp -1 / ω 2 C f ′.

10. The design method of the strong anti-drift electric vehicle wireless charging system according to claim 8 is characterized in that: System AC power supply (U p ), compensation coil in series with compensation capacitor (C f '), parallel compensation capacitor at the transmitting end (C f ), transmitting coil series compensation capacitor (C p ) and the receiving coil compensation capacitor (C s ) is:

Images