Capacitor configuration method based on interleaved winding coil and wireless electric energy transmission system

Abstract

The invention relates to the technical field of wireless power transmission (WPT), in particular to a capacitor configuration method based on a staggered winding coil and a wireless power transmission system.The capacitor configuration method comprises the steps that firstly, an energy transmission coil is wound into a staggered winding coil structure, and further based on the staggered winding coil structure, the equivalent inductance characteristic of the coil is analyzed, so that the wireless power transmission capacity is obtained; and a plurality of compensation capacitors are connected in series between the interlaced coil winding structures, so that the potential between adjacent turns can present a position with an anti-phase characteristic. According to the invention, the positions of a plurality of compensation capacitors are distributed strategically, so that the voltage difference between adjacent turns is offset to the maximum extent, and the electric field exposure level is effectively reduced. The arrangement of the compensation capacitor only depends on the structural characteristics and the working frequency of the coil, so that the compensation capacitor can adapt to various compensation network configurations, and the electric field exposure level is remarkably reduced while the wireless electric energy transmission system keeps high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transfer (WPT), and particularly to a capacitance configuration method based on an interleaved winding coil and a wireless power transfer system. Background Art

[0002] The inductive wireless power transfer (IPT) system has significantly changed the charging method of electric vehicles (EVs) through efficient wireless power transfer. However, the electric field exposure in the IPT system brings safety risks. The high electric field regions generated by electromagnetic radiation can have adverse effects on the environment, equipment, and human health. Especially during wireless charging, strong electric fields may cause electromagnetic interference (EMI) to nearby electronic devices, thus affecting their normal operation. Long-term exposure to a high electric field environment may also pose potential risks to health, especially to sensitive areas such as the head and chest.

[0003] Although existing IPT designs include electromagnetic shielding, uneven electric field distribution and incomplete shielding still lead to safety problems. Therefore, reducing the electric field intensity and optimizing the electric field distribution are crucial for ensuring the safe and reliable operation of a wireless electric vehicle charging system. Traditional average segmentation methods have limited effectiveness in reducing the electric field intensity because they do not consider the phase characteristics of the inter-turn voltage, resulting in large regions with high electric field intensity. Summary of the Invention

[0004] The present invention provides a capacitance configuration method based on an interleaved winding coil and a wireless power transfer system, and the technical problem to be solved is that: traditional resonant capacitance average segmentation methods do not consider the phase characteristics of the inter-turn voltage, resulting in large regions with high electric field intensity.

[0005] To solve the above technical problems, the present invention provides a capacitance configuration method based on an interleaved winding coil, including the steps of: Interleaving and winding the power transfer coil of the wireless power transfer system into an n -turn same-direction interleaved winding coil. Interleaving and winding means that, starting from the outside to the inside, the first n / 2 turns are wound, and then, between the turns of the first n / 2 turns, the subsequent n / 2 turns are wound from the inside to the outside; Equivalent the series compensation capacitor connected to the power transfer coil into m compensation capacitors distributed in series in the interleaved winding coil, where the starting point of each turn of the interleaved winding coil serves as the node position for connecting a compensation capacitor in series, and m compensation capacitors are respectively connected in series inm The node position, the m The node positions satisfy m After the compensation capacitors are connected in series, the voltage difference between adjacent turns of the interleaved winding coil presents an anti-phase characteristic.

[0006] Furthermore, the voltage difference between adjacent turns of the interleaved winding coils exhibits an anti-phase characteristic, which means: forward n The voltage at the starting point of a 2-turn interleaved winding coil and the average voltage at all starting points relative to ground V avg The imaginary part of the difference between n The voltage at the starting point of a 2-turn interleaved winding coil and the average voltage at all starting points relative to ground V avg The imaginary part of the difference between them is less than 0.

[0007] Further, m The compensation capacitors are connected in series m Node location, specifically including the steps: S1. m The compensation capacitors are connected in series in the first group m Node locations; S2. Based on the current structural characteristics, calculate n The voltage at the starting point of the interleaved winding coil V k The average voltage at all starting points relative to ground V avg The difference between V k,diff , k Indicates the k Starting position, 1≤ k ≤ n ; S3, according to the difference V k,diff Determine whether the voltage difference between adjacent turns of the staggered winding coils presents an anti-phase characteristic. If so, the current group m The node positions are used as the final m Node position, if not, go to the next step; S4. m The compensation capacitors are connected in series in the second group m node position and returns to step S2.

[0008] Further, in step S3, if all groups are traversed m If the voltage difference between the adjacent turns of the staggered winding coils still does not show the anti-phase characteristic, then change mAfter obtaining the value of , return to step S1.

[0009] Further, the k voltage at the starting position of the V k is: from the node k to the node n the sum of the voltage across each equivalent inductor between them jωIL i minus the sum of the voltage across each capacitor between these nodes jIm k / ( ωC ), I represents the root mean square value of the current in the energy transfer coil, C represents the capacitance value of each compensation capacitor, ω represents the operating angular frequency of the system, m k represents the number of capacitors located between the node k and the node n .

[0010] Further, the equivalent inductance i of the L i turn interleaved winding coil L ii is composed of its own self - inductance value k ij and the sum of the coupling inductances with other turns. Each coupling inductance is given by the product of the coupling coefficient

[0011] Further, the average voltage V avg of all starting positions relative to the ground is: after summing up all the node voltages without compensation capacitors, subtracting the voltage offset caused by the compensation capacitors, and then dividing by the total number of turns. The calculation method of the voltage offset caused by the compensation capacitors is to add up the node numbers where the 2nd to the m th compensation capacitors are located, subtract the number of compensation capacitors m and then add 1, and then multiply by the product of the current and the reactance of the compensation capacitor. Among them, the node position of the 1st compensation capacitor is at the starting position of the 1st turn interleaved winding coil.

[0012] Further, the energy transfer coil includes a transmitting coil and a receiving coil.

[0013] The present invention also provides a wireless power transmission system, which is characterized in that: it includes a power transmitting end and a power receiving end. The power transmitting end is provided with a transmitting end compensation network and a transmitting coil connected thereto. The power receiving end is provided with a receiving coil and a receiving end compensation network connected thereto. The transmitting coil and the receiving coil are interleaved and wound into nThe interleaved winding coil with turns in the same direction. Interleaved winding means that before winding from the outside to the inside n / 2 turns, before n / 2 turns, after winding from the inside to the outside between the turns of the previous n / 2 turns; The compensation capacitors connected to the transmitting coil in the transmitting - end compensation network and the compensation capacitors connected to the receiving coil in the receiving - end compensation network are configured according to the capacitance configuration method based on the interleaved winding coil described above.

[0014] Preferably, the transmitting - end compensation network and the receiving - end compensation network adopt an LCC compensation network.

[0015] The capacitance configuration method based on the interleaved winding coil and the wireless power transfer system provided by the present invention first wind the power - transfer coil into an interleaved winding coil structure. Further, based on this interleaved coil winding structure, by analyzing the equivalent inductance characteristics of the coil, multiple compensation capacitors are connected in series at positions where the potential between adjacent turns shows an anti - phase characteristic in this interleaved coil winding structure. This invention strategically allocates the positions of multiple compensation capacitors to maximize the cancellation of the voltage difference between adjacent turns, thereby effectively reducing the electric - field exposure level. The arrangement of the compensation capacitors depends only on the structural characteristics of the coil and the operating frequency, enabling it to adapt to various compensation network configurations, so that while maintaining high efficiency, the electric - field exposure level of the wireless power transfer system is significantly reduced. Brief Description of the Drawings

[0016] Figure 1 is a flowchart of the capacitance configuration method based on the interleaved winding coil provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a 6 - turn interleaved winding coil provided by an embodiment of the present invention; Figure 3 is provided by an embodiment of the present invention for m compensation capacitors are respectively connected in series at m equivalent circuit diagrams after the node positions; Figure 4 is a distribution diagram of the coil node voltages provided by an embodiment of the present invention; Figure 5 is an example diagram of the circuit structure of the wireless power transfer system provided by an embodiment of the present invention; Figure 6 is a configuration process diagram of the compensation capacitor positions of the wireless power transfer system provided by an embodiment of the present invention; Figure 7 is a top - view diagram of the transmitting - end or receiving - end of the simulated coupling mechanism provided by an embodiment of the present invention; Figure 8 is a magnetic - field and electric - field distribution diagram of three compensation schemes provided by an embodiment of the present invention; Figure 9 It is the waveform diagram of current and voltage during the operation of the prototype provided by the embodiments of the present invention; Figure 10 It is the DC-DC efficiency curve diagram of three configurations provided by the embodiments of the present invention at different output power levels; Figure 11 It is the electric field intensity test diagram of three configurations provided by the embodiments of the present invention. Specific Embodiments

[0017] The following specifically illustrates the embodiments of the present invention in conjunction with the accompanying drawings. The given embodiments are only for illustrative purposes and should not be construed as a limitation of the present invention. The included drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from its spirit and scope.

[0018] The embodiments of the present invention first provide a capacitance configuration method based on an interleaved winding coil, as Figure 1 shown in the flowchart, including the steps: Interleave the energy transfer coils of the wireless power transfer system to form n turns of interleaved winding coils in the same direction. Interleaved winding means that from the outside to the inside, the first n / 2 turns are wound, and from the inside to the outside between the turns of the first n / 2 turns, the subsequent n / 2 turns are wound; Equivalent the series compensation capacitor connected to the energy transfer coil into m compensation capacitors distributed in series in the interleaved winding coil. The starting point of each turn of the interleaved winding coil serves as the node position for connecting a compensation capacitor in series, m compensation capacitors are respectively connected in series at m node positions. These m node positions satisfy that after m compensation capacitors are connected in series, the voltage difference between adjacent turns of the interleaved winding coil shows an anti-phase characteristic.

[0019] The energy transfer coil here includes a transmitting coil and a receiving coil. The structure of a 6-turn interleaved winding coil is as Figure 2 shown, which includes the first 3 turns wound from the outside to the inside L 11 , L 22 and L 33 and the subsequent 3 turns wound from the inside to the outside L 44 , L 55 and L 66 ​。To facilitate the connection of the compensation capacitor, in this embodiment, the winding method with the starting point and the ending point of the coil both located outside the coil (from outside to inside and then from inside to outside) is adopted. In other embodiments, the winding method from inside to outside and then from outside to inside can also be adopted.

[0020] Use C 1 to C m respectively represent m compensation capacitors. Taking the starting point of each turn of the interleaved winding coil as the node position for connecting a compensation capacitor, then m compensation capacitors are respectively connected in series at m node positions, and the equivalent circuit diagram is as shown in Figure 3 . Figure 3 In L ii represents the self-inductance of the i th turn of the coil, M ij represents the mutual inductance between the i th turn of the coil and the j th turn of the coil ( i ≠ j ), I is the root mean square value of the current flowing through the coil, V in-coil is the equivalent AC source of the energy transfer coil, V Li is the voltage across the i th turn of the coil, V i is the voltage of the starting point position of the i th turn of the coil relative to the ground. Based on the circuit structure relationship shown in Figure 3 , the equivalent inductance i of the L i th turn of the coil is composed of its own self-inductance value L ii and the sum of the coupling inductances with other turns. Each coupling inductance is given by the product of the coupling coefficient k ij and the geometric mean of the self-inductances of the two turns. Among them, L ii represents the self-inductance of the i th turn of the interleaved winding coil, k ij represents the coupling coefficient between the i th turn of the interleaved winding coil and the j th turn of the interleaved winding coil, and can be expressed by the formula: , The total number of compensation capacitors C is m , useω represents the operating angular frequency of the system, m k Indicates that it is located L k ( k =1,2,…, n )and L n The number of capacitors between them satisfies 0≤ m k ≤ m Ignoring the internal resistance of the inductor, after connecting the compensation capacitor, L k Voltage at the starting point V k For: Slave node k To Node n Each equivalent inductor voltage between ( jωIL i ) minus the sum of the voltages of each capacitor between these nodes ( jIm k / ( ωC )), which can be expressed as: .

[0021] make S i ( i =1,2,.. m )express m The node position of the compensation capacitor is located. The first compensation capacitor is located at the input port of the staggered winding coil (the starting point of the first turn coil), that is, S 1=1. Average voltage of all starting points relative to ground V avg The voltage offset is calculated by adding up the voltages of all nodes without compensation capacitors (only equivalent inductance per turn), subtracting the voltage offset caused by the compensation capacitor, and then dividing by the total number of turns. m The node number where the compensation capacitor is located S i ( i =2,.. m ) plus the amount of compensation capacitors m Add 1 and multiply by the product of the current and the reactance of the compensation capacitor, which can be expressed as: .

[0022] Based on equations (2) and (3), the starting voltage of each turn of the interleaved winding coil can be obtained: V k With the average voltage V avgThe difference, and its expression is: .

[0023] Based on the design of the interleaved winding structure of the energy transfer coil, in order to cancel out the voltage between adjacent turns to the greatest extent, the voltage difference between adjacent turns should exhibit an anti-phase characteristic, as Figure 4 shown in the voltage distribution diagram of the coil nodes. Therefore, the voltage difference between the starting positions of the coil must meet the requirements of Equation (5): , The meaning of Equation (5) is that the imaginary part of the difference between the voltage at the starting position of the first n / 2 turns of the interleaved winding coil and the average voltage of all starting positions with respect to ground V avg Im( V k,diff ) is greater than 0; the imaginary part of the difference between the voltage at the starting position of the last n / 2 turns of the interleaved winding coil and the average voltage of all starting positions with respect to ground V avg Im( V k,diff ) is less than 0.

[0024] According to Equations (4) and (5), the positions of all compensation capacitors can be determined by Equation (6): , where the parameter A defined for the simplified form is defined as follows: .

[0025] It can be seen from Equations (6) and (7) that the positions of the compensation capacitors only depend on the structural characteristics of the coil and the operating frequency, and are independent of the current flowing through the coil or the terminal voltage of the coil. This shows that the capacitance configuration method based on the interleaved winding coil proposed by the present invention has strong adaptability and can be flexibly applied to various compensation topologies.

[0026] Connect m compensation capacitors in series at m node positions respectively, specifically including the steps: S1. Connect m compensation capacitors in series at the first group of m node positions; S2. Based on the current structural characteristics, calculate the voltage n at the starting position of the V k turns of the interleaved winding coil and the average voltage V avgThe difference between V k,diff , k represents the k th starting position, where 1 ≤ k ≤ n ; S3. According to the difference V k,diff , determine whether the voltage difference between adjacent turns of the interleaved winding coil shows an anti-phase characteristic. If so, use the m node positions of the current group as the final m node positions. If not, proceed to the next step; S4. Connect m compensation capacitors in series to the m node positions of the second group, and return to step S2.

[0027] Based on the above capacitance configuration method for the interleaved winding coil, an embodiment of the present invention further provides a wireless power transmission system, which includes a power transmitting end and a power receiving end. The power transmitting end is provided with a transmitting end compensation network and a transmitting coil connected together. The power receiving end is provided with a receiving coil and a receiving end compensation network connected together. The transmitting coil and the receiving coil are interleaved and wound into n turns of co-directional interleaved winding coils. Interleaved winding means that the first n [[ID=३३]] / 2 turns are wound from the outside to the inside, and the subsequent n / 2 turns are wound from the inside to the outside between the turns of the previous n / 2 turns. The compensation capacitors connected to the transmitting coil in the transmitting end compensation network and the compensation capacitors connected to the receiving coil in the receiving end compensation network are configured according to the above capacitance configuration method for the interleaved winding coil.

[0028] An example of the circuit structure of the wireless power transmission system proposed in this embodiment is as Figure 5 shown. The transmitting end compensation network and the receiving end compensation network of this wireless power transmission system adopt an LCC compensation network. On the basis of the bilateral LCC compensation network, the series compensation capacitor C p of the transmitting end compensation network and the series compensation capacitor C s of the receiving end compensation network are both divided into four equal parts. The first one is fixedly connected to the starting positions of the transmitting coil and the receiving coil, and the remaining three( C px / C sx , x = 2, 3, 4) are integrated into the transmitting coil L p and the receiving coil L sIn a wireless power transmission system, the configuration process of the compensation capacitor position is as follows Figure 6 shown, specifically including the steps: 1. Determine the basic system parameters according to the actual application requirements, including the output power of the system P out , operating frequency f sw , system input voltage V in , transmitting coil size D p , receiving coil size D s , number of compensation capacitors at the transmitting end m p , number of compensation capacitors at the receiving end m s ; 2. Based on the transmitting coil size D p , receiving coil size D s determine the number of turns of the transmitting coil n p , number of turns of the receiving coil n s , and further determine the self-inductance of the transmitting coil L p , self-inductance of the receiving coil L s ; 3. Based on the operating frequency f sw , self-inductance of the transmitting coil L p , self-inductance of the receiving coil L s , according to the resonance relationship, determine the values of the compensation capacitor and compensation inductor; 4. Establish a coil simulation model to determine the equivalent inductance of each turn of the transmitting coil and receiving coil; 5. Use the iterative optimization method to determine the final m p number of node positions and m s number of node positions.

[0029] In step 5, the iterative optimization method for the transmitting coil and the receiving coil is the same. Taking the transmitting coil as an example, the process of determining the final m p number of node positions is as follows: Determine m p the first group of mp A transmitting - end compensation capacitor is connected in series; Determine whether the voltage difference between adjacent turns of the transmitting coil exhibits an anti - phase characteristic. If so, use the m node positions of the current group as the final m node positions. If not, proceed to the next step; Connect the m compensation capacitors in series at the m node positions of the second group and return to the previous step.

[0030] The output power of the system can be derived by the fundamental - harmonic approximation (FHA) method as: , where, k is the coupling coefficient between the transmitting coil and the receiving coil, U AB and U ab are the voltages of the inverter and rectifier bridge arms, L f1 and L f2 are the compensation inductances in the transmitting - end compensation network and the receiving - end compensation network respectively.

[0031] In summary, for the capacitance configuration method and the wireless power transfer system based on the interleaved - winding coil provided in the embodiments of the present invention, first, the power - transfer coil is wound into an interleaved - winding coil structure. Further, based on this interleaved - coil winding structure, by analyzing the equivalent inductance characteristics of the coil, multiple compensation capacitors are connected in series at positions where the potential between adjacent turns exhibits an anti - phase characteristic. This invention strategically allocates the positions of multiple compensation capacitors to maximize the cancellation of the voltage difference between adjacent turns, thereby effectively reducing the electric - field exposure level. The arrangement of the compensation capacitors depends only on the structural characteristics of the coil and the operating frequency, enabling it to adapt to various compensation - network configurations, so that while maintaining high efficiency, the electric - field exposure level of the wireless power transfer system is significantly reduced.

[0032] Next, simulations and experimental verifications are carried out.

[0033] In this embodiment, the finite - element simulation software HFSS is used to verify the effectiveness of the proposed method and system. The coil setting parameters are shown in Table 1:

[0034] In the simulation settings, the switching frequency is set to 85 kHz. The transmitting coil and the receiving coil have the same size and the same number of turns (22 turns). Both the transmitting coil and the receiving coil are equipped with shielding plates and magnetic cores. The coil currents on the transmitting side and the receiving side are 11.5 A and 13 A respectively. Based on the proposed design process for the compensation capacitor positions, the C p optimal positions of the corresponding four compensation capacitors C p1 -C p4 are 1, 9, 16, and 19 respectively. C s The optimal positions of the corresponding four compensation capacitors C s1 -C s4 are 1, 9, 16, and 19 respectively.

[0035] Figure 7 is a top view of the transmitting or receiving end of the coupling mechanism for the simulation. As can be seen from Figure 7 , the 2nd, 3rd, and 4th compensation capacitors are connected in series to the 9th, 16th, and 19th turns respectively. Under the same operating conditions, the proposed compensation capacitor positions (ITAP configuration) are compared with the average segmented configuration (located at 1, 7, 12, and 18 respectively) and the non-segmented configuration. The magnetic field and electric field distributions of the three compensation schemes are as Figure 8 shown. Figure 8 The results of show that the magnetic field distributions of the three compensation schemes are almost the same, indicating that the positions of the compensation capacitors have no significant effect on the magnetic field distribution of the coupling mechanism, and thus have no significant effect on the transmission efficiency of the system. In terms of the electric field distribution, the proposed ITAP configuration significantly reduces the high electric field intensity regions, and these regions are mainly concentrated near the coils.

[0036] To verify the advantage of the capacitor configuration method proposed in the embodiments of the present invention in reducing electric field exposure, a 3.3 kW prototype was built according to the above simulation settings. Figure 9 shows the current and voltage waveforms during the operation of the prototype, where I pri is the current of the transmitting coil, I AB is the inverter output current at the transmitting end. Since the waveforms of the three compensation configurations are almost the same, only the experimental waveforms of the ITAP configuration are shown. As can be seen from Figure 9 , the system successfully achieves zero voltage switching (ZVS). Figure 10 shows the DC-DC efficiency curves of the three configurations at different output power levels. As can be seen from Figure 10 , the proposed ITAP configuration does not affect the transmission efficiency of the system, further verifying the accuracy of the simulation results.

[0037] The electric field intensities of three configurations were measured using an NF-5035 tester, and the test results are as Figure 11 shown. The test positions started from the edge and the middle height of the coupling mechanism and moved horizontally outwards for the electric field intensity test. From Figure 11 it can be seen that the electric field intensities of the ITAP configuration are 50.93% of the non-segmented configuration and 62.73% of the average segmented configuration respectively, significantly reducing the external electric field exposure.

[0038] In summary, the present invention proposes a capacitance configuration method and a wireless power transmission system based on an interleaved winding coil, aiming to reduce the electric field radiation in an inductive power transmission system. The proposed capacitance configuration method and system generate an anti-phase voltage difference between adjacent coil turns by strategically arranging individual compensation capacitors, maximizing the cancellation of the inter-turn voltage and significantly reducing the internal and external electric field intensities. The simulation and experimental results verify that the capacitance configuration method and system significantly reduce the electric field exposure level while maintaining the wireless power transmission efficiency. The comparison with the traditional average segmented and non-segmented compensation configurations shows that the capacitance configuration method and system proposed in the embodiments of the present invention have significant advantages in suppressing high electric field regions, thus improving the safety of the wireless power transmission system.

[0039] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A capacitance configuration method based on an interleaved winding coil, characterized in that, Including steps: The energy transmission coils of the wireless power transmission system are wound in a staggered manner to form n a staggered winding coil with the same number of turns and the same direction. The staggered winding means that before winding from the outside to the inside, n / 2 turns, and after winding from the inside to the outside between the turns of the previous n / 2 turns; n / 2 turns; The series compensation capacitor connected to the energy transfer coil is equivalently converted into m compensation capacitors are distributed in series in the interleaved winding coil, where the starting point of each turn of the interleaved winding coil serves as the node position for connecting a compensation capacitor in series, m compensation capacitors are respectively connected in series at m node positions, and the m node positions satisfy that m after the compensation capacitors are connected in series, the voltage difference between adjacent turns of the interleaved winding coil exhibits an anti-phase characteristic.

2. The capacitance configuration method based on the interleaved winding coil according to claim 1, characterized in that The voltage difference between adjacent turns of the interleaved winding coil exhibits an anti-phase characteristic, which means: Front n The imaginary part of the difference between the voltage at the starting position of the / 2-turn interleaved winding coil and the average voltage of all starting positions with respect to the ground V avg is greater than 0; and, back n The imaginary part of the difference between the voltage at the starting position of the / 2-turn interleaved winding coil and the average voltage of all starting positions with respect to the ground V avg is less than 0.

3. The capacitance configuration method based on the interleaved winding coil according to claim 2, wherein Connect m compensation capacitors in series at m node positions respectively, specifically including the steps: S1. Connect m compensation capacitors in series at the positions of the first group of m nodes respectively; S2. Calculate, based on the current structural characteristics, n the voltage at the starting position of the turn interleaved winding coil V k and the average voltage of all starting positions with respect to the ground V avg the difference between them V k,diff , k indicating the k th starting position, where 1 ≤ k ≤ n ; S3. According to the difference V k,diff Determine whether the voltage difference between adjacent turns of the interleaved winding coils shows an anti-phase characteristic. If so, use the m node positions of the current group as the final m node positions. If not, proceed to the next step; S4. Connect m compensation capacitors in series at the positions of the second group of m nodes respectively, and return to step S2.

4. The capacitance configuration method based on the interleaved winding coil according to claim 3, wherein: In step S3, if after traversing all m the positions of the nodes, the voltage difference between the adjacent turn interleaved winding coils still does not exhibit an anti-phase characteristic, then after changing m the value of, return to step S1.

5. The capacitance configuration method based on the interleaved winding coil according to claim 4, characterized in that The voltage at the k first starting position V k is: the sum of the voltages across each equivalent inductor from node k to node n minus the sum of the voltages across each capacitor between these nodes jωIL i / ( jIm k ), ωC ) where I represents the root mean square value of the current in the energy transfer coil, C represents the capacitance value of each compensation capacitor, ω represents the operating angular frequency of the system, m k represents the number of capacitors between node k and node n .

6. The capacitance configuration method based on the interleaved winding coil according to claim 5, wherein Turn i Equivalent Inductance of the Interleaved Winding Coil L i Consists of its own self-inductance value L ii And the sum of the coupling inductances with each other turn. Each coupling inductance is given by the product of the coupling coefficient k ij And the geometric mean of the self-inductances of the two turns.

7. The capacitance configuration method based on the interleaved winding coil according to claim 6, wherein: Average voltage of all starting positions relative to the ground V avg is: After adding up the node voltages without compensation capacitors, subtracting the voltage offset caused by the compensation capacitors, and then dividing by the total number of turns. The calculation method of the voltage offset caused by the compensation capacitors is to add up the node numbers where the 2nd to the m th compensation capacitors are located, subtract the number of compensation capacitors m and then add 1, and then multiply by the product of the current and the reactance of the compensation capacitor. The node position of the 1st compensation capacitor is at the starting position of the 1st turn of the interleaved winding coil.

8. The capacitance configuration method based on the interleaved winding coil according to any one of claims 1 to 7, characterized in that: The energy transfer coil includes a transmitting coil and a receiving coil.

9. Wireless power transmission system, characterized in that: It includes a power transmitting end and a power receiving end. The power transmitting end is provided with a transmitting end compensation network and a transmitting coil connected thereto. The power receiving end is provided with a receiving coil and a receiving end compensation network connected thereto. The transmitting coil and the receiving coil are wound into n an interleaved winding coil with the same number of turns in the same direction. The interleaved winding means that before winding from the outside to the inside n / 2 turns, and before n / 2 turns between the turns, wind from the inside to the outside after n / 2 turns; The compensation capacitor connected to the transmitting coil in the transmitting-end compensation network and the compensation capacitor connected to the receiving coil in the receiving-end compensation network are configured according to the capacitance configuration method based on the interleaved winding coil described in any one of claims 1 to 8.

10. The wireless power transmission system according to claim 9, wherein: The transmitting-end compensation network and the receiving-end compensation network adopt an LCC compensation network.

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