Magnetic coupler and strong anti-deviation electric vehicle wireless charging system and design method thereof

Abstract

The application discloses a magnetic coupler and a strong anti-deviation 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 in a square structure. The compensation coil is composed of two coil groups which are distributed in a diagonal mode and are connected in series. The transmitting coil is composed of another two coil groups which are distributed in a diagonal mode and are connected in series. The system and the design method thereof can solve the problems that the anti-deviation capability is weak, the anti-deviation capability has directionality, and the receiving end structure is complex and difficult to arrange.

Description

Technical Field

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

[0002] In recent years, my country's electric vehicle industry has experienced unprecedented prosperity, accompanied by significant advancements in EV charging technology and infrastructure. In addition to traditional conductive charging, the development of new wide-bandgap power devices has also given rise to wireless charging. Wireless charging, based on wireless power transmission technology, is convenient, safe, and reliable, avoiding wear and tear caused by frequent plugging and unplugging, and improving charging safety in rainy, snowy, and humid environments. With the rise of autonomous driving and smart car technologies, wireless charging has become a powerful complement to conductive charging and a future development trend.

[0003] Currently, one of the biggest obstacles to the practical application of wireless charging systems remains the offset problem. Due to parking accuracy limitations, relative offset between the system's transmitter and receiver is unavoidable. The mutual inductance between the transmitting and receiving coils is related to the offset position, and large-scale coil offset can cause drastic fluctuations in the system's output power and transmission efficiency. To improve the offset resistance of wireless charging systems, existing solutions have proposed a series of methods to improve offset resistance, focusing on magnetic coupler design, compensation topology, compensation parameters, and control strategies.

[0004] For example, the use of a flat solenoid magnetic coupler can significantly improve the anti-offset capability of a wireless charging system in a certain horizontal direction. However, due to structural limitations, the impact of offsets in two orthogonal horizontal directions on the flat solenoid magnetic coupler is quite different, and the system's anti-offset capability in the other horizontal direction is poor. It can be seen that wireless charging systems not only require strong anti-offset capabilities, but also require 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. Existing anti-offset wireless charging system solutions are difficult to meet 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 wireless charging system for electric vehicles 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 the complex structure of the receiving end.

[0006] In order to achieve the above object, the application discloses a magnetic coupler, which 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, and the transmitting end is in a cross-shaped structure, wherein the compensation coil is composed of two coil groups distributed diagonally in series, and the transmitting coil is composed of another two coil groups distributed diagonally in series.

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

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

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

[0010] Further, the compensation coil is wound by two layers of coils.

[0011] Further, the transmitting coil is wound by two layers of coils.

[0012] The application discloses a strong anti-deviation electric vehicle wireless charging system, 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] The series branch formed by the compensation coil, the system AC power supply and the compensation coil series compensation capacitor is connected in parallel with the series branch formed by the transmitting end parallel compensation capacitor, the transmitting coil series compensation capacitor and the transmitting coil.

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

[0015] The application discloses a design method of a strong anti-deviation electric vehicle wireless charging system, which comprises the following steps:

[0016] The capacitance value of the compensation coil series compensation capacitor is determined.

[0017] The corresponding relationship of 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 is determined.

[0018] According to the capacitance value of the compensation coil series compensation capacitor and the corresponding relationship of 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, the strong anti-deviation electric vehicle wireless charging system is constructed.

[0019] Further, the capacitance value of the compensation coil in series with the compensation capacitor 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] Wherein, M fp is the mutual inductance between the compensation coil and the transmitting coil, M ps is the mutual inductance between the transmitting coil and the receiving coil, M fs is the mutual inductance between the compensation 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 directly opposite, 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 when the magnetic coupler is at the maximum offset distance, L f ′=L f -M fp -1 / ω 2 C f ′.

[0022] Further, the corresponding relationship of the system AC power supply, the compensation coil in series with the compensation capacitor, the transmitting end in parallel with the compensation capacitor, the transmitting coil in series with the compensation capacitor and the receiving coil in series with the compensation capacitor is as follows:

[0023]

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

[0025] During specific operation, the magnetic coupler and the highly resistant-offset wireless charging system for electric vehicles and the design method thereof described in the present invention comprise a transmitting end including a compensation coil and a transmitting coil. The transmitting end and the receiving end are distributed in parallel. The compensating coil and the transmitting coil cooperate to provide the transmitting end with a strong resistant-offset capability. Meanwhile, the resistant-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 wireless charging system for electric vehicles. The overall structure of the system is relatively simple, and the on-board receiving end of the system only requires a most basic coil and a compensation capacitor, without requiring a compensation inductor and other additional components. This is beneficial to the lightweight receiving end of the wireless charging system for electric vehicles, can achieve a higher receiving end power density, and facilitates the arrangement of on-board components. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it is to be understood that the terms “include” and “comprise” indicate the presence of the 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 particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should be further understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items, and that the term "at least one of A and / or B" means A or B or both A and B. In addition, the character " / " as used herein generally indicates an "or" relationship between the associated objects before and after the " / ".

[0034] It should be understood that, even though the terms first, second, third, etc. can be used herein to describe various ranges or elements, these ranges or elements should not be limited by these terms. These terms are only used to distinguish one range or element from another. For example, a first range could be termed a second range without departing from the scope of the embodiments.

[0035] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting." Similarly, the phrase "if it is determined" or "if [a stated condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the stated condition or event]" or "in response to detecting [the stated condition or event]."

[0036] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Generally, the components of the embodiments of the present application described here and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is only intended to represent the selected embodiments of the present application and is not intended to limit the scope of the claimed present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0037] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These diagrams are not drawn to scale, in which some details are exaggerated for the purpose of clarity and some details can be omitted. The shapes of various regions, layers, and the relative size and position relationship between them shown in the diagrams are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes, and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0038] Embodiment One

[0039] Reference Figure 1 The magnetic coupler comprises a transmitting end and a receiving end, the receiving end comprises a receiving coil L s , the transmitting end comprises a compensation coil L f and a transmitting coil L p , the receiving coil L s is located above the compensation coil L f and the transmitting coil L p , and the receiving end and the transmitting end are distributed in parallel.

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

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

[0042] The transmitting end and the receiving end are distributed in parallel, and one end surface of the transmitting end corresponds to one end surface of the receiving end, wherein each end surface of the transmitting end and the corresponding end surface 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, the receiving coil L s , the transmitting coil L p and the compensation coil L f are wound in a dense manner, wherein the compensation coil L f and the transmitting coil L p are both wound by two layers of coils.

[0044] Embodiment two

[0045] Reference Figure 2 The embodiment discloses a strong anti-offset electric vehicle wireless charging system, which comprises a system AC power supply U p , a compensation coil L f , a compensation coil series compensation capacitor C f , a transmitting end parallel compensation capacitor C f , a transmitting coil series compensation capacitor C p , a transmitting coil L p , a receiving coil L s , a receiving coil compensation capacitor C s and a system load R eq .

[0046] The compensation coil L f , the system AC power supply U pand the compensation coil is in series with a compensation capacitor C f The formed series branch is in parallel with the transmitting end and a compensation capacitor C f and the transmitting coil is in series with a compensation capacitor C p and the transmitting coil L p The formed series branch is connected in parallel;

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

[0048] Embodiment three

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

[0050] Table 1

[0051]

[0052] The magnetic coupler is trial-produced according to the design parameters in Table 1, and the mutual inductance M fs_n and M ps_n of the magnetic coupler are respectively 36.2 μH and 36.7 μH when the magnetic coupler is directly opposite, the mutual inductance M fs_m and M ps_m are respectively 29.4 μH and 30.3 μH when the magnetic coupler is horizontally offset by 200 mm, and accordingly, the value of L f is selected as 110 μH under the condition of a rated working frequency of 85 kHz and a 10 Ω load of the system, and the value of C f is designed as 21.53 nF.

[0053] Since the values of L f , L p and L s of the trial-produced magnetic coupler are respectively 226.9 μH, 235.2 μH and 308.9 μH, the compensation parameters C f , C p and C s in the system are respectively designed as 54.74 nF, 20.48 nF and 11.35 nF, and the anti-offset capability of the test system is tested, and the results are shown in Table 2. Figure 3 It can be seen that the output power of the system is basically constant within the range of horizontal offset of 220 mm and vertical offset of 50 mm, and the system has strong anti-offset capability.

[0054] Embodiment four

[0055] The design method of the strong anti-offset electric vehicle wireless charging system provided by the application comprises:

[0056] determining the capacitance value of the compensation coil series compensation capacitor C f ;

[0057] determining the corresponding relationship of the system AC power U p , the compensation coil series compensation capacitor C f , the transmitting end parallel compensation capacitor C f , the transmitting coil series compensation capacitor C p , and the receiving coil compensation capacitor C s ;

[0058] constructing a strong anti-offset electric vehicle wireless charging system according to the capacitance value of the compensation coil series compensation capacitor C f and the corresponding relationship of the system AC power U p , the compensation coil series compensation capacitor C f , the transmitting end parallel compensation capacitor C f , the transmitting coil series compensation capacitor C p , and the receiving coil compensation capacitor C s .

[0059] As an embodiment of the present application, the capacitance value of the compensation coil series compensation capacitor C f 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] wherein M fp is the mutual inductance between the compensation coil L f and the transmitting coil L p , M ps is the mutual inductance between the transmitting coil L p and the receiving coil L s , M fs is the mutual inductance between the compensation coil L f and the receiving coil L s , and M ps_n and M fs_n are respectively the mutual inductance between the transmitting coil L p and the receiving coil L s when the magnetic coupler is directly opposite.Mutual inductance between the compensation coil L f and the receiving coil L ps_m and M fs_m are the mutual inductance between the transmitting coil L p and the receiving coil L s and the compensation coil L f and the receiving coil L s , L f ′ = L f -M fp -1 / ω 2 C f ′.

[0062] As an embodiment of the present application, the corresponding relationship of the system AC power supply U p , the compensation coil series compensation capacitor C f ', the transmitting end parallel compensation capacitor C f , the transmitting coil series compensation capacitor C p and the receiving coil compensation capacitor C s is as follows:

[0063]

[0064] Example five

[0065] The design system of the strong anti-offset electric vehicle wireless charging system provided by the present application comprises:

[0066] A first determination module is configured to determine the capacitance value of the compensation coil series compensation capacitor C f '.

[0067] A second determination module is configured to determine the corresponding relationship of the system AC power supply U p , the compensation coil series compensation capacitor C f ', the transmitting end parallel compensation capacitor C f , the transmitting coil series compensation capacitor C p and the receiving coil compensation capacitor C s .

[0068] A construction module is configured to construct the strong anti-offset electric vehicle wireless charging system according to the capacitance value of the compensation coil series compensation capacitor C f ' and the corresponding relationship of the system AC power supply U p , the compensation coil series compensation capacitor C f ', the transmitting end parallel compensation capacitor C f , the transmitting coil series compensation capacitor C p and the receiving coil compensation capacitor C s .

[0069] As an embodiment 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 Mutual inductance between ps is the transmitting coil L p With the receiving coil L s Mutual inductance between fs For the compensation coil L f With the receiving coil L s 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 and the compensation coil L f and the mutual inductance between the receiving coil, M 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 and the compensation coil L f and receiving coil L s The mutual inductance between f ′=L f -M fp -1 / ω 2 C f ′.

[0072] As an embodiment 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 the modules in the embodiments of the present application is illustrative, and is merely a logical functional division. In actual implementation, another division manner can be used. In addition, each functional module in each embodiment of the present application can be integrated in one processor, or can be physically separated, or two or more modules can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module.

[0075] Embodiment six

[0076] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the design method of the strong anti-offset electric vehicle wireless charging system when executing the computer program, for example, including: determining the capacitance value of the compensation coil series compensation capacitor C f , determining the corresponding relationship of the system AC power U p , the compensation coil series compensation capacitor C f , the transmitting end parallel compensation capacitor C f , the transmitting coil series compensation capacitor C p , and the receiving coil compensation capacitor C s , and constructing the strong anti-offset electric vehicle wireless charging system according to the capacitance value of the compensation coil series compensation capacitor C f , the corresponding relationship of the system AC power U p , the compensation coil series compensation capacitor C f , the transmitting end parallel compensation capacitor C f , the transmitting coil series compensation capacitor C p , and the receiving coil compensation capacitor C s . The memory can include a memory, for example, a high-speed random access memory, and can also include a non-volatile memory, for example, at least one disk memory. The processor, network interface, and memory are connected to each other through an internal bus, which can be an industry standard architecture bus, a peripheral component interconnect standard bus, an extended industry 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, and specifically, the programs can include program codes, and the program codes include computer operation instructions. The memory can include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0077] Embodiment seven

[0078] A computer readable storage medium stores a computer program, which, when executed by a processor, implements steps of a design method of a strong anti-offset electric vehicle wireless charging system, for example, including: determining a corresponding relationship of capacitance values of a compensation coil series compensation capacitor C f , a system AC power U p , a compensation coil series compensation capacitor C f , a transmitting end parallel compensation capacitor C f , a transmitting coil series compensation capacitor C p , and a receiving coil compensation capacitor C s ; and constructing the strong anti-offset electric vehicle wireless charging system according to the capacitance values of the compensation coil series compensation capacitor C f , the system AC power U p , the compensation coil series compensation capacitor C f , the transmitting end parallel compensation capacitor C f , the transmitting coil series compensation capacitor C p , and the receiving coil compensation capacitor C s . Specifically, the computer readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory can include random access memory (RAM) and / or cache memory, etc. The non-volatile memory can include read-only memory (ROM), hard disk, flash memory, optical disc, magnetic disc, etc.

[0079] Those skilled in the art will understand that embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer usable program code.

[0080] The present application is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, 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 apparatus to produce a machine, so that the instructions, which are executed via the processor of the computer or other programmable data processing apparatus, generate a means for implementing the flow Figure 1 flow or multiple flows and / or blocks Figure 1means for performing the function specified by the block or blocks.

[0081] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow Figure 1 flow or flows and / or blocks Figure 1 means for performing the function specified by the block or blocks.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 flow or flows and / or blocks Figure 1 means for performing the function specified by the block or blocks.

[0083] Finally, it should be noted that the above-mentioned embodiments are merely intended to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and any modifications or replacements not departing from the spirit and scope of the present application should be covered within the protection scope of the claims of the present application.

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 distributed in parallel, the transmitting end is a field-shaped structure, wherein the compensation coil (L f ) consists of two diagonally distributed coil groups connected 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, wherein: The receiving coil (L s ) is a planar square coil.

3. The magnetic coupler according to claim 1, wherein: 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, wherein: 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, wherein: The compensation coil (L f ) is wound with two layers of coils.

6. The magnetic coupler according to claim 1, wherein: The transmitting coil (L p ) is wound with two layers of coils.

7. A strong anti-drift electric vehicle wireless charging system, characterized in that: Including system AC power supply (U p ), compensation coil in series with compensation capacitor (C f '), transmitter parallel compensation capacitor (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 of the 8. A design method for a highly resistant electric vehicle wireless charging system according to claim 7, characterized in that: include: Determine the compensation coil series compensation capacitance (C f ') capacitance value; Determine the system AC power supply (U p ), compensation coil in series with compensation capacitor (C f '), transmitter parallel compensation capacitor (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 '), transmitter parallel compensation capacitor (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 ) mutual inductance, M ps For the transmitting coil (L p ) and the receiving coil (L s ) mutual inductance, M fs For the compensation coil (L f ) and the receiving coil (L s ) 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 coil (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 coil (L f ) and the receiving coil (L s ) 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, characterized in that: System AC power supply (U p ), compensation coil in series with compensation capacitor (C f '), transmitter parallel compensation capacitor (C f ), transmitting coil series compensation capacitor (C p ) and the receiving coil compensation capacitor (C s ) is:

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