Cross solenoid coupling mechanism and design method thereof for wireless charging with resistance to lateral deviation

Abstract

The present application discloses a cross-solenoid coupling mechanism for wireless charging that resists lateral deviation and a design method thereof, and relates to the field of radio technology. The transmitting structure of the cross-solenoid coupling mechanism for resisting lateral deviation is wound with a central transmitting coil in the middle of a short side, and offset compensation coils are wound at both ends of the short side. A plurality of valley-filling coils are respectively wound between the offset compensation coil at each end and the central transmitting coil. During the design, the number of turns of each coil in the transmitting structure and the number of turns of each coil in the receiving structure are obtained through matching design, so that the cross-solenoid coupling mechanism for resisting lateral deviation meets the target anti-lateral deviation parameter requirements. The cross-solenoid coupling mechanism for resisting lateral deviation has a wider constant mutual inductance area, and can fill the mutual inductance valley value through the valley-filling coil, so as to provide a larger and more stable working area for the receiving structure, and has high anti-lateral deviation performance, and can be used in occasions with high requirements for anti-lateral deviation performance.

Description

Technical Field

[0001] The present application relates to the field of radio technology, and in particular to a cross-solenoid coupling mechanism for wireless charging with an anti-lateral deviation function and a design method thereof. Background Art

[0002] In recent years, wireless power transmission technology has developed rapidly due to its safety, environmental protection, high reliability and other advantages, and has gradually entered various industries. At present, wireless power transmission technology has been applied to the fields of electric vehicles, consumer portable electronic products, medical implants, etc.

[0003] However, compared with traditional wired charging technology, wireless power transmission technology has a major drawback, namely poor spatial freedom. When the relative positions of the magnetic coupling mechanisms of the wireless power transmission system are offset, the transmission efficiency and transmission power of the system will be greatly affected. When the offset reaches a certain distance, the system will not work properly. This feature greatly limits the development of wireless power transmission technology.

[0004] Many magnetic coupling mechanisms have been proposed and applied in different fields, but the existing various methods of improving the anti-drift performance of the system through magnetic coupling mechanisms and compensation networks have a common disadvantage, that is, in the case of offset, the mutual inductance between the transmitting and receiving coils will fluctuate to a certain extent, because the transmitting coil cannot provide a uniform magnetic field. The patent with publication number CN113793746A designs a cross solenoid magnetic coupling mechanism with high offset performance, which can reduce the mutual inductance attenuation caused by the lateral offset of the coil to a certain extent, but the magnetic field provided by this magnetic coupling mechanism is still not uniform enough, and the anti-drift characteristics are still not ideal, which still leads to the output power on the working plane not being smooth enough. Summary of the invention

[0005] In view of the above problems and technical requirements, the applicant has proposed a cross solenoid coupling mechanism for resisting lateral deviation and a design method thereof. The technical solution of the present application is as follows:

[0006] A cross-solenoid coupling mechanism for wireless charging that resists lateral deviation, the cross-solenoid coupling mechanism for wireless charging is used to construct a wireless charging system, and the cross-solenoid coupling mechanism for wireless charging comprises a transmitting structure and a receiving structure that are relatively arranged;

[0007] The receiving structure includes a receiving magnetic conductive sheet and two receiving coils. The receiving magnetic conductive sheet is in a rectangular structure. The first receiving coil is wound in the middle of the receiving magnetic conductive sheet along the long side of the receiving magnetic conductive sheet, and the second receiving coil is wound in the middle of the receiving magnetic conductive sheet along the short side of the receiving magnetic conductive sheet. The first receiving coil and the second receiving coil are wound in a cross-orthogonal manner.

[0008] The transmitting structure includes a transmitting magnetic conductive sheet, a horizontal transmitting coil, a central transmitting coil, two offset compensation coils and a plurality of valley filling coils; the transmitting magnetic conductive sheet is in a rectangular structure and is parallel and spaced apart from the receiving magnetic conductive sheet, and the short side and the long side of the transmitting magnetic conductive sheet are not less than the corresponding side length of the receiving magnetic conductive sheet;

[0009] The horizontal transmitting coil is wound in the middle of the transmitting magnetic conductive sheet along the long side direction of the transmitting magnetic conductive sheet, the central transmitting coil is wound in the middle of the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet, two offset compensation coils are respectively wound at both ends of the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet, and a plurality of valley-filling coils are respectively wound between the offset compensation coil at each end and the central transmitting coil, and each valley-filling coil is respectively wound on the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet;

[0010] The number of turns of each coil in the transmitting structure and the number of turns of each coil in the receiving structure are obtained through matching design, so that the anti-lateral deviation cross solenoid coupling mechanism meets the target anti-lateral deviation parameter requirements.

[0011] A further technical solution is that when the receiving structure is located at different lateral offset positions of the transmitting structure, the error amount of the total mutual inductance between the coil in the receiving structure and the coil in the transmitting structure never exceeds an error threshold.

[0012] A further technical solution is that the anti-lateral deviation cross solenoid coupling mechanism includes a plurality of valley-filled coil pairs, each of which includes two valley-filled coils located on both sides of a central transmitting coil and symmetrical with respect to the central transmitting coil, and the specifications of the two valley-filled coils in the same valley-filled coil pair are equal.

[0013] A further technical solution is that a plurality of valley-filling coils are evenly wound at intervals in the area between the offset compensation coil at each end and the central transmitting coil.

[0014] A design method for a cross solenoid coupling mechanism for wireless charging that resists lateral deviation, the design method comprising:

[0015] The structural design of the receiving structure includes a rectangular receiving magnetic conductive sheet, and a first receiving coil and a second receiving coil wound in a cross-orthogonal manner on the receiving magnetic conductive sheet, wherein the first receiving coil is wound in the middle of the receiving magnetic conductive sheet along the long side direction of the receiving magnetic conductive sheet, and the second receiving coil is wound in the middle of the receiving magnetic conductive sheet along the short side direction of the receiving magnetic conductive sheet;

[0016] The structural design of the transmitting structure is determined to include a transmitting magnetic conductive sheet of a rectangular structure, a horizontal transmitting coil, a central transmitting coil, two offset compensation coils and a plurality of valley-filling coils, wherein the horizontal transmitting coil is located in the middle of the transmitting magnetic conductive sheet and is wound along the long side of the transmitting magnetic conductive sheet, the central transmitting coil is located in the middle of the transmitting magnetic conductive sheet and is wound along the short side of the transmitting magnetic conductive sheet, the two offset compensation coils are respectively located at the two ends of the transmitting magnetic conductive sheet and are both wound along the short side of the transmitting magnetic conductive sheet, and a plurality of valley-filling coils are respectively included between the offset compensation coil at each end and the central transmitting coil, and each valley-filling coil is wound along the short side of the transmitting magnetic conductive sheet; the short side and the long side of the transmitting magnetic conductive sheet are not less than the corresponding side length of the receiving magnetic conductive sheet;

[0017] Determine the vertical distance between the receiving magnetic conductive sheet and the transmitting magnetic conductive sheet which are arranged parallel and spaced relative to each other;

[0018] Initialize the coil turns combination, which includes the turns of all coils in the receiving structure and the transmitting structure;

[0019] Under the current combination of coil turns, based on the structural design of the receiving structure, the structural design of the transmitting structure and the vertical distance between the two, calculate whether the anti-lateral offset cross solenoid coupling mechanism meets the target anti-lateral offset parameter requirements;

[0020] When the target anti-lateral offset parameter requirement is not met, the coil turns combination is adjusted until the target anti-lateral offset parameter requirement is met, and an anti-lateral offset cross solenoid coupling mechanism for constructing a wireless charging system is designed.

[0021] A further technical solution is to calculate whether the anti-lateral deviation cross solenoid coupling mechanism meets the target anti-lateral deviation parameter requirements, including:

[0022] Calculating whether the requirement that the error amount between the total mutual inductance between the coil in the receiving structure and the coil in the transmitting structure does not exceed the error threshold is met when the receiving structure is located at each lateral offset position of the transmitting structure;

[0023] When the requirement is met, it is determined that the anti-lateral deviation cross solenoid coupling mechanism meets the target anti-lateral deviation parameter requirement, otherwise it is determined that the target anti-lateral deviation parameter requirement is not met.

[0024] A further technical solution is that the long side of the transmitting magnetic conductive sheet is parallel to the long side of the receiving magnetic conductive sheet, and the short side of the transmitting magnetic conductive sheet is parallel to the short side of the receiving magnetic conductive sheet;

[0025] The total mutual inductance at each lateral offset position includes the mutual inductance M between the horizontal transmitting coil and the first receiving coil L , the mutual inductance M between the central transmitting coil and the second receiving coil M, the mutual inductance M between an offset compensation coil and the second receiving coil C1 , the mutual inductance M between the other offset compensation coil and the second receiving coil C2 ; Mutual inductance M between each valley filling coil and the second receiving coil V , the total mutual inductance at the lateral offset position

[0026] And the mutual inductance between any two coils i and j is Among them, l i is the length vector of coil i, l j is the length vector of coil j, dl i is the differential element of the length vector of coil i, dl j is the infinitesimal length vector of coil j, R ij is the current lateral offset position dl i and dl j The distance between i is the number of turns of coil i in the current coil turns combination, N j is the number of turns of coil j in the current coil turns combination, and μ0 is the magnetic permeability of vacuum.

[0027] A further technical solution is that the initialization coil turns combination includes: determining the turns N of the first receiving coil RL , the number of turns of the second receiving coil N RV , the number of turns of the horizontal transmitting coil N TL , the number of turns of the central transmitting coil N TM , Initialize the number of turns N of each offset compensation coil TC =0, initialize the number of turns N of each valley filling coil TV =0; adjusting the coil turns combination includes adjusting the turns of each offset compensation coil and the turns of each valley filling coil, and keeping the turns of other coils unchanged;

[0028] Methods for adjusting the coil turns combination until the target lateral offset resistance parameter requirements are met include:

[0029] Calculate the total mutual inductance M when the receiving structure is located in the middle of the transmitting structure total-o , and calculate the total mutual inductance M when the receiving structure is located at the winding position of a valley-filling coil total-V , increase the number of turns of the valley-filling coil wound at the current position, and recalculate the total mutual inductance M total-o and total mutual inductance M total-V , until the total mutual inductance M total-V With total mutual inductance M total-o When the error between them does not exceed the error threshold, the number of turns N of the valley-filling coil wound at the current position is obtained. TV; Calculate and obtain the number of turns N of each valley-filling coil at the lateral offset position corresponding to each valley-filling coil TV ;

[0030] Based on the number of turns of other coils, calculate the total mutual inductance M when the receiving structure is located in the middle of the transmitting structure. total-o , and calculate the total mutual inductance M when the receiving structure is located at the offset compensation coil at each end total-C , increase the number of turns of the offset compensation coil in sequence, and recalculate the total mutual inductance M total-o and total mutual inductance M total-C , until the total mutual inductance M total-C Exceeding the total mutual inductance M total-o When the number of turns N of the offset compensation coil wound at the current position is obtained TC ; Calculate and obtain the number of turns N of each offset compensation coil at the lateral offset position corresponding to the offset compensation coil at both ends TC .

[0031] Its further technical solution is that the method further comprises:

[0032] In order to increase the number of turns N of the offset compensation coil TC In the process of calculating the total mutual inductance M total-C Exceeding the total mutual inductance M total-o The final number of turns N of the offset compensation coil is obtained by adding a predetermined additional number of turns to the number of turns N TC .

[0033] Its further technical solution is that the method further comprises:

[0034] After adjusting to obtain a coil turn combination that meets the target anti-lateral offset parameter requirements, finite element simulation is performed according to the coil turn combination, the structural design of the receiving structure, the structural design of the transmitting structure, and the vertical distance between the two. When the simulation results indicate that the anti-lateral offset cross-solenoid coupling mechanism meets the target anti-lateral offset parameter requirements, the anti-lateral offset cross-solenoid coupling mechanism is designed;

[0035] When the simulation results indicate that the cross-solenoid coupling mechanism for resisting lateral deviation does not meet the target lateral deviation parameter requirements, the number of turns N of the horizontal transmitting coil is adjusted. TL and the number of turns of the central transmitting coil N TM And reinitialize the coil turns combination, and adjust the coil turns combination again.

[0036] The beneficial technical effects of this application are:

[0037] The present application discloses a cross-solenoid coupling mechanism for wireless charging that is resistant to lateral displacement and a design method thereof. The cross-solenoid coupling mechanism that is resistant to lateral displacement has a wider constant mutual inductance area and can fill the mutual inductance valley value through the valley-filling coil, thereby providing a larger and more stable working area for the receiving structure. The mechanism has high lateral displacement resistance performance and can be used in situations where high lateral displacement resistance performance is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of an anti-lateral deviation cross solenoid coupling mechanism in one embodiment of the present application.

[0039] Figure 2 It is a flow chart of a design method of a cross solenoid coupling mechanism for resisting lateral deviation in one embodiment of the present application.

[0040] Figure 3 It is a flow chart of a design method of a cross solenoid coupling mechanism for resisting lateral deviation in another embodiment of the present application.

[0041] Figure 4 The circuit structure diagram of a wireless charging system constructed based on an anti-lateral deviation cross solenoid coupling mechanism in an embodiment.

[0042] Figure 5 is a simulation example, when Figure 1 A graph of the total mutual inductance at different lateral displacements when the number of turns of the valley-filled coil in the structure shown is different.

[0043] Figure 6 is an experimental example, when Figure 1 A graph of total mutual inductance at different lateral displacements when the vertical distances between the transmitting structure and the receiving structure in the structure shown are different.

[0044] Figure 7 is an experimental example, when Figure 1 A graph of power at different lateral displacements when the vertical distances between the transmitting structure and the receiving structure in the structure shown are different.

[0045] Figure 8 is an experimental example, when Figure 1 A curve diagram of the transmission efficiency at different lateral displacements when the vertical distance between the transmitting structure and the receiving structure in the structure shown is different. DETAILED DESCRIPTION

[0046] The specific implementation of the present application is further described below in conjunction with the accompanying drawings.

[0047] The present application discloses a cross solenoid coupling mechanism for wireless charging that resists lateral deviation, and the cross solenoid coupling mechanism for wireless charging is used to construct a wireless charging system. Figure 1 The anti-lateral deviation cross solenoid coupling mechanism includes a transmitting structure 1 and a receiving structure 2 which are arranged opposite to each other. In practical application, the anti-lateral deviation cross solenoid coupling mechanism may include a plurality of receiving structures 2 used in conjunction with the transmitting structure 1, and the structures of the plurality of receiving structures 2 are the same. Figure 1 Only a single receiving structure 2 is shown.

[0048] The transmitting structure 1 includes a transmitting magnetic conductive sheet 11, a horizontal transmitting coil 12, a central transmitting coil 13, two offset compensation coils 14 and 15 and a plurality of valley filling coils. Figure 1 Take the example of two valley-filling coils 16 and 17. The short side length of the transmitting magnetic sheet 11 is Y T , the length of the long side is X T , thickness is Z T Any two coils in the transmitting structure 1 are independent of each other or connected in series.

[0049] The receiving structure 2 includes a receiving magnetic conductive sheet 21 and two receiving coils 21 and 22. The receiving magnetic conductive sheet 21 is a rectangular structure. The long side of the receiving magnetic conductive sheet 21 is X R , the short side is Y R , thickness is Z R , the first receiving coil 22 and the second receiving coil 23 are wound in a cross-orthogonal manner in the middle of the receiving magnetic conductive sheet 21. The first receiving coil 22 is wound in the middle of the receiving magnetic conductive sheet 21 along the long side direction of the receiving magnetic conductive sheet 21, and the second receiving coil 23 is wound in the middle of the receiving magnetic conductive sheet 21 along the short side direction of the receiving magnetic conductive sheet 21. The two receiving coils in the receiving structure 2 are independent of each other, or connected in series.

[0050] The transmitting magnetic conductive sheet 11 is in a rectangular structure and is arranged parallel to the receiving magnetic conductive sheet 21. Assume that the vertical distance between the two is h. The short side and the long side of the transmitting magnetic conductive sheet 11 are not less than the corresponding side lengths of the receiving magnetic conductive sheet 21. In the present application, the long side of the transmitting magnetic conductive sheet 11 is parallel to the long side of the receiving magnetic conductive sheet 21, and the short side of the transmitting magnetic conductive sheet 11 is parallel to the short side of the receiving magnetic conductive sheet 21. Then X T ≥X R , Y T ≥Y R The transmitting magnetic conductive sheet 11 and the receiving magnetic conductive sheet 21 may be chamfered and hollowed out respectively.

[0051] The horizontal transmitting coil 12 is wound in the middle of the transmitting magnetic conductive sheet 11 along the long side direction of the transmitting magnetic conductive sheet 11, and the central transmitting coil 13 is wound in the middle of the transmitting magnetic conductive sheet 11 along the short side direction of the transmitting magnetic conductive sheet 11. Two offset compensation coils 14 and 15 are respectively wound at the two ends of the transmitting magnetic conductive sheet 11 along the short side direction of the transmitting magnetic conductive sheet 11, as shown in FIG. Figure 1 As shown, each offset compensation coil is wound at a distance X from the end surface of the transmitting magnetic conductive sheet 11. C A plurality of valley-filling coils are wound between the offset compensation coil at each end and the central transmitting coil 13, and each valley-filling coil is wound on the transmitting magnetic conductive sheet 11 along the short side direction of the transmitting magnetic conductive sheet 11. Figure 1 Take for example the valley-filling coil 16 wound between the offset compensation coil 14 and the central transmitting coil 13 , and the valley-filling coil 17 wound between the offset compensation coil 15 and the central transmitting coil 13 .

[0052] In one embodiment, the anti-lateral deviation cross solenoid coupling mechanism includes a plurality of valley-filled coil pairs, each of which includes two valley-filled coils, which are located on both sides of the central transmitting coil 13 and are symmetrical with respect to the central transmitting coil 13, and the specifications of the two valley-filled coils in the same valley-filled coil pair are equal. Figure 1 In the embodiment, the valley-filled coils 16 and 17 form a valley-filled coil pair, the winding positions of the two valley-filled coils 16 and 17 are symmetrical with respect to the central transmitting coil 13, and the number of winding turns of the two valley-filled coils 16 and 17 is equal, so as to have better symmetry performance.

[0053] In one embodiment, the valley-filling coils between the offset compensation coil and the central transmitting coil 13 are wound evenly at intervals in the area between the offset compensation coil and the central transmitting coil 13. Figure 1 In the embodiment, when there is only one valley-filling coil on one side, a uniformly wound structure is also adopted, that is, the distance between the valley-filling coil 16 and the offset compensation coil 14 is equal to the distance between the valley-filling coil 16 and the central transmitting coil 13. When there are more valley-filling coils 16, they are also arranged at equal distances. This uniformly distributed structure can have better anti-lateral offset characteristics.

[0054] Based on this structural design, the number of turns of each coil in the transmitting structure 1 and the number of turns of each coil in the receiving structure 2 are obtained through matching design so that the anti-lateral offset cross-solenoid coupling mechanism meets the target anti-lateral offset parameter requirements. In the present application, the anti-lateral offset cross-solenoid coupling mechanism meets the target anti-lateral offset parameter requirements, which means that when the receiving structure 2 is located at different lateral offset positions of the transmitting structure 1, the error amount of the total mutual inductance between the coils in the receiving structure 2 and the coils in the transmitting structure 1 does not exceed the error threshold. The error threshold can be customized. When the receiving structure 2 is used in conjunction with the transmitting structure 1, the receiving structure 2 can be moved along the length direction of the transmitting structure 1 and located at different lateral offset positions. The receiving structure 2 can be defined as being set in the middle of the transmitting structure 1, so that when the center of the receiving structure 2 coincides with the center of the transmitting structure 1, the lateral offset at the lateral offset position is 0. When the receiving structure 2 is located in the area between the center of the transmitting structure 1 and one end of the offset compensation coil 14, the lateral offset at each lateral offset position is negative. When the receiving structure 2 is located in the region between the center of the transmitting structure 1 and one end where the offset compensation coil 15 is provided, the lateral offset at each lateral offset position is positive.

[0055] This application also discloses a design method for the cross solenoid coupling mechanism for wireless charging that resists lateral deviation. Please refer to Figure 2 The design method includes the following steps:

[0056] Step 1, determine the structural design of the receiving structure 2 and the structural design of the transmitting structure 1. The structural design is as described above, and this step will not be described in detail. When performing the structural design, the specifications of the transmitting magnetic conductive sheet 11 and the receiving magnetic conductive sheet 21 are fixed, and the number of valley filling coils is determined.

[0057] Step 2, determine the vertical distance h between the receiving magnetic conductive sheet 21 and the transmitting magnetic conductive sheet 11 which are arranged in parallel and spaced apart from each other. The vertical distance h is user-defined and generally cannot be too far.

[0058] Step 3, initializing the coil turn combination, which includes the turns of all coils in the receiving structure 2 and the transmitting structure 1.

[0059] Step 4, under the current coil turns combination, based on the structural design of the receiving structure 2, the structural design of the transmitting structure 1 and the vertical distance between the two, calculate whether the anti-lateral offset cross solenoid coupling mechanism meets the target anti-lateral offset parameter requirements.

[0060] In one embodiment, the method for calculating whether the anti-lateral offset cross-solenoid coupling mechanism meets the target anti-lateral offset parameter requirement includes: calculating whether the error amount between the total mutual inductance between the coil in the receiving structure 2 and the coil in the transmitting structure 1 does not always exceed the error threshold when the receiving structure 2 is located at each lateral offset position of the transmitting structure 1. If the requirement is met, it is determined that the anti-lateral offset cross-solenoid coupling mechanism meets the target anti-lateral offset parameter requirement, otherwise it is determined that the target anti-lateral offset parameter requirement is not met.

[0061] When the calculation determines that the anti-lateral offset cross solenoid coupling mechanism meets the target anti-lateral offset parameter requirements, the anti-lateral offset cross solenoid coupling mechanism is designed. When the calculation determines that the anti-lateral offset cross solenoid coupling mechanism does not meet the target anti-lateral offset parameter requirements, the coil turn array is adjusted and the above calculation is repeated until the anti-lateral offset cross solenoid coupling mechanism is finally designed.

[0062] When the receiving structure 2 is located at each lateral offset position of the transmitting structure 1, the method for calculating the total mutual inductance between the coil in the receiving structure 2 and the coil in the transmitting structure 1 at the lateral offset position includes:

[0063] The total mutual inductance at each lateral offset position includes the mutual inductance M between the horizontal transmitting coil 12 and the first receiving coil 22. L , the mutual inductance M between the central transmitting coil 13 and the second receiving coil 23 M , the mutual inductance M between an offset compensation coil 14 and the second receiving coil 23 C1 , the mutual inductance M between the other offset compensation coil 15 and the second receiving coil 23 C2 , and the mutual inductance M between each valley-filling coil and the second receiving coil 23 V Then the total mutual inductance between the receiving structure 2 and the transmitting structure 1 at the lateral offset position is determined to be M total =M L +M M +M C1 +M C2 +∑M V ,∑M V Represents the mutual inductance M of all valley-filling coils V Add together and determine according to the number of valley-filling coils actually included.

[0064] In the above calculation process, the mutual inductance between any two coils i and j is Among them, l i is the length vector of coil i, l j is the length vector of coil j, dl i is the infinitesimal length vector of coil i, dl jis the infinitesimal length vector of coil j. ij is the current lateral offset position dl i and dl j The distance between the coils is fixed on the magnetic sheet, and the vertical distance h and the lateral offset position are determined. ij It can be calculated, and this embodiment does not describe its calculation process in detail. i is the number of turns of coil i in the current coil turns combination, N j is the number of turns of coil j in the current coil turns combination, and μ0 is the magnetic permeability of vacuum.

[0065] Since the number of coils included in the transmitting structure 1 and the receiving structure 2 is relatively large, in order to improve the efficiency of adjusting the coil turn combination, this embodiment sets the number of turns N of the first receiving coil 22 when initializing the coil turn combination. RL , the number of turns N of the second receiving coil 23 RV , the number of turns N of the horizontal transmitting coil 12 TL , the number of turns N of the central transmitting coil 13 TM The number of turns of these coils remains unchanged when the number of turns of the coils is subsequently adjusted, and then the number of turns of each offset compensation coil N is initialized. TC = 0, initialize the number of turns of each valley-filling coil N TV = 0. In addition, the distance X between the offset compensation coil at each end and the end surface of the transmitting magnetic conductive sheet 11 is set C , Therefore, on the basis of uniform winding of the valley-filling coil, the position of each valley-filling coil can be determined, for example, based on Figure 1 By winding a valley-filling coil on one side, the distance between each valley-filling coil and the adjacent coil can be determined.

[0066] Then the method of adjusting the coil turns combination until the target anti-lateral offset parameter requirements are met includes, please refer to Figure 3 The flowchart shown:

[0067] Calculate the total mutual inductance M when the receiving structure 2 is located in the middle of the transmitting structure 1 total-o , and calculate the total mutual inductance M when the receiving structure 2 is located at the winding position of a valley-filling coil total-V .

[0068] When the total mutual inductance M total-V With total mutual inductance M total-o When the error between them does not exceed the error threshold δ, that is, M total-V -M total-o ≤δ, determine the number of turns N of the valley-filling coil wound at the current position TV .

[0069] When M is not satisfied total-V -M total-o ≤δ, the number of turns of the valley-filling coil wound at the current position is increased by one, and then the total mutual inductance M is recalculated. total-o and total mutual inductance M total-V And judge, increase the number of turns of the valley filling coil wound at the current position in sequence until the total mutual inductance M total-V With total mutual inductance M total-o When the error between them does not exceed the error threshold, the number of turns N of the valley-filling coil wound at the current position is obtained. TV .

[0070] In this way, the number of turns N of each valley-filling coil is calculated at the lateral offset position corresponding to each valley-filling coil. TV .

[0071] Based on the number of turns of other coils, the total mutual inductance M is calculated when the receiving structure 2 is located in the middle of the transmitting structure 1. total-o , and calculate the total mutual inductance M when the receiving structure 2 is located at the offset compensation coil at each end total-C .

[0072] When M is satisfied total-C >M total-o When the number of turns N of the offset compensation coil wound at the current position is determined TC .

[0073] When M is not satisfied total-C >M total-o When the number of turns of the current offset compensation coil is increased by one, the total mutual inductance M is recalculated. total-o and total mutual inductance M total-C , gradually increase the number of turns of the offset compensation coil until the total mutual inductance M is obtained. total-C Exceeding the total mutual inductance M total-o In one embodiment, the number of turns obtained at this time is not directly used as the number of turns of the offset compensation coil, but a predetermined additional number of turns is added on this basis to obtain the final number of turns N of the offset compensation coil. TC This is because the offset compensation coil is located at the edge, and there is more magnetic field directly distributed in the air, resulting in the actual total mutual inductance at this position being smaller than the theoretical calculated value. Therefore, in order to compensate for this error, a predetermined additional number of turns is added to the calculated number of turns. The predetermined additional number of turns is an empirical value, such as 1 turn.

[0074] The number of turns N of each offset compensation coil is calculated at the lateral offset position corresponding to the offset compensation coils at both ends. TC .

[0075] Alternatively, in another embodiment, only the number of turns of the valley-filling coil may be adjusted, and the number of turns of the offset compensation coil may be directly set unchanged.

[0076] In another embodiment, after adjusting the coil turns combination through the above calculation to meet the target anti-lateral deviation parameter requirements, the anti-lateral deviation cross solenoid coupling mechanism is not directly designed according to the coil turns combination. In order to avoid the error of theoretical calculation, the method further includes the following steps: Figure 3 As shown:

[0077] After adjusting the coil turns combination that meets the target anti-lateral offset parameter requirements, finite element simulation is performed according to the coil turns combination, the structural design of the receiving structure 2, the structural design of the transmitting structure 1, and the vertical distance between the two.

[0078] When the simulation results indicate that the anti-lateral deviation cross-solenoid coupling mechanism meets the target anti-lateral deviation parameter requirements, the anti-lateral deviation cross-solenoid coupling mechanism is designed.

[0079] When the simulation results indicate that the anti-lateral deviation cross solenoid coupling mechanism does not meet the target anti-lateral deviation parameter requirements, the number of turns N of the horizontal transmitting coil 12 is adjusted. TL and the number of turns N of the central transmitting coil 13 TM In this step, the distance X between the offset compensation coil at each end and the end surface of the transmitting magnetic conductive sheet 11 can also be adjusted. C . Then adjust the number of turns N TL 、Number of turns TM and distance X C and execute the above process of adjusting the number of coil turns combination again.

[0080] The cross solenoid coupling mechanism with the above structure designed by the above design method has better anti-lateral deviation performance and can be used to build a wireless charging system. Please refer to Figure 4 As shown in the application circuit diagram, the DC power source is converted into AC power of a certain frequency through the DC-AC high-frequency inverter circuit, and then input into the reactive power compensation network at the transmitting end. The power is transmitted to each receiving structure 2 through the transmitting structure 1. The reactive power compensation network at the receiving end transmits the AC power received by the receiving structure 2 to the rectifier circuit, which provides energy to the load after rectification and filtering. The transmitting structure 1 can cooperate with multiple receiving structures 2 to supply power to multiple loads respectively, such as Figure 2 Take powering two loads as an example.

[0081] In a more typical application, when the load is the battery of an electric bicycle, the receiving structure 2 is installed in the base of the electric bicycle, and the transmitting structure is buried in the bottom surface of the charging platform. The wireless charging system constructed as above can realize wireless charging of the electric bicycle. Moreover, since the anti-lateral displacement cross solenoid coupling mechanism of the present application can include multiple receiving structures 2 and has better anti-lateral displacement performance, it is possible to realize one-to-many stable charging of multiple electric bicycles with built-in receiving structures 2 by one transmitting structure 1.

[0082] In order to illustrate that the anti-lateral deviation cross solenoid coupling mechanism of the present application has better anti-lateral deviation performance, the present application is described as follows.

[0083] Both the transmitting magnetic conductive sheet 11 and the receiving magnetic conductive sheet 21 are made of ferrite made of manganese-zinc material. The specifications of the transmitting magnetic conductive sheet 11 are 27cm*9cm*1cm, and the specifications of the receiving magnetic conductive sheet 21 are 9cm*9cm*1cm. The number of turns of the two receiving coils is 10 turns, the number of turns of the horizontal transmitting coil 12 is 9 turns, and the number of turns of the central transmitting coil is 3 turns. The number of turns of the offset compensation coils 14 and 15 at both ends is set to 7 turns. The distance between the offset compensation coil at each end and the end face of the transmitting magnetic conductive sheet is 3cm, and a valley filling coil is set on one side.

[0084] The receiving structure 2 is aligned with the center of the transmitting structure 1 as the position where the lateral offset is 0. When the vertical distance between the transmitting structure 1 and the receiving structure 2 is h=2cm, the lateral offset range corresponding to different lateral offset positions of the receiving structure 2 is -18cm to 18cm, and the finite element simulation is performed with a step size of 1cm.

[0085] Please refer to Figure 5 The graph shows the change curve of the total mutual inductance at different lateral offset positions when the number of turns of the valley-filling coil is different. When the number of turns of each valley-filling coil is initialized to 0, the magnetic field is not uniform enough, which affects its anti-offset characteristics and causes the output power on the working plane to be not smooth enough. As the number of turns of the valley-filling coil increases, the mutual inductance at the valley value is significantly enhanced until it is basically the same as the peak value, that is, the error of the total mutual inductance is within the error threshold, and the number of turns of the valley-filling coil is finally determined to be 3 turns. Therefore, when the lateral offset of the receiving structure is from -9cm to 9cm, there is a relatively stable mutual inductance.

[0086] In addition, the value of the vertical distance h will also affect the mutual inductance effect. In an experimental example, when the vertical distance h is 2cm, 3cm and 4cm respectively, the change curve of the total mutual inductance at different lateral offset positions is as follows: Figure 6As shown in the figure. When the vertical distance is 2cm, the actual measured mutual inductance is almost consistent with the simulation result, and the mutual inductance of the working plane within the lateral offset range of -9cm to 9cm is relatively stable. When the vertical distance increases to 3cm or 4cm, the mutual inductance on the working plane is almost a horizontal line.

[0087] In addition, when the vertical distance is different, the transmission power and transmission efficiency of the wireless charging system constructed by the anti-lateral offset cross solenoid coupling mechanism are also different. When the vertical distance h is 2 cm, 3 cm and 4 cm respectively, the transmission power curves at different lateral offset positions are as follows: Figure 7 As shown in the figure, the transmission efficiency curves at different lateral offset positions are shown in Figure 8 As shown. The change trend of the system output power is consistent with the mutual inductance. When the vertical distance is 2cm, the output power on the working plane is stable at around 51.95W. When the vertical distance increases to 3cm or 4cm, the fluctuation of the output power decreases, providing a more stable output power on the working plane. At the same time, the transmission efficiency on the working plane remains sufficiently stable at any transmission distance, which is fully in line with the expected design. When the vertical distance is 2cm, 3cm and 4cm, the transmission efficiency on the working plane is 72.4%, 69.6% and 64.3% respectively.

[0088] The above is only a preferred embodiment of the present application, and the present application is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included in the protection scope of the present application.

Claims

1. A cross solenoid coupling mechanism for wireless charging with an anti-lateral deviation feature: The anti-lateral deviation cross solenoid coupling mechanism is used to construct a wireless charging system, and the anti-lateral deviation cross solenoid coupling mechanism includes a transmitting structure and a receiving structure that are relatively arranged; The receiving structure comprises a receiving magnetic conductive sheet and two receiving coils, wherein the receiving magnetic conductive sheet is in a rectangular structure, the first receiving coil is wound at the middle of the receiving magnetic conductive sheet along the long side direction of the receiving magnetic conductive sheet, and the second receiving coil is wound at the middle of the receiving magnetic conductive sheet along the short side direction of the receiving magnetic conductive sheet, and the first receiving coil and the second receiving coil are wound in a cross-orthogonal manner; The transmitting structure includes a transmitting magnetic conductive sheet, a horizontal transmitting coil, a central transmitting coil, two offset compensation coils and a plurality of valley filling coils; the transmitting magnetic conductive sheet is in a rectangular structure and is parallel and spaced apart from the receiving magnetic conductive sheet, and both the short side and the long side of the transmitting magnetic conductive sheet are not less than the corresponding side length of the receiving magnetic conductive sheet; The horizontal transmitting coil is wound in the middle of the transmitting magnetic conductive sheet along the long side direction of the transmitting magnetic conductive sheet, the central transmitting coil is wound in the middle of the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet, two offset compensation coils are respectively wound at both ends of the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet, and a plurality of valley-filling coils are respectively wound between the offset compensation coil at each end and the central transmitting coil, and each valley-filling coil is respectively wound on the transmitting magnetic conductive sheet along the short side direction of the transmitting magnetic conductive sheet; The number of turns of each coil in the transmitting structure and the number of turns of each coil in the receiving structure are obtained through matching design, so that the anti-lateral deviation cross solenoid coupling mechanism meets the target anti-lateral deviation parameter requirements; The anti-lateral deviation cross solenoid coupling mechanism includes a plurality of valley-filled coil pairs, each of which includes two valley-filled coils located on both sides of the central transmitting coil and symmetrical with respect to the central transmitting coil, and the two valley-filled coils in the same valley-filled coil pair have equal specifications.

2. The cross solenoid coupling mechanism for resisting lateral deviation according to claim 1, characterized in that: When the receiving structure is located at different lateral offset positions of the transmitting structure, the error amount of the total mutual inductance between the coil in the receiving structure and the coil in the transmitting structure never exceeds an error threshold.

3. The cross solenoid coupling mechanism for resisting lateral deviation according to claim 1, characterized in that: A plurality of valley-filling coils are evenly wound at intervals in the area between the offset compensation coil at each end and the central transmitting coil.

4. A design method for a cross solenoid coupling mechanism for wireless charging with an anti-lateral deviation feature: The design method comprises: The structural design of the receiving structure includes a receiving magnetic conductive sheet of a rectangular structure, and a first receiving coil and a second receiving coil wound in a cross-orthogonal manner on the receiving magnetic conductive sheet, wherein the first receiving coil is wound in the middle of the receiving magnetic conductive sheet along the long side direction of the receiving magnetic conductive sheet, and the second receiving coil is wound in the middle of the receiving magnetic conductive sheet along the short side direction of the receiving magnetic conductive sheet; The structural design of the transmitting structure is determined to include a transmitting magnetic conductive sheet of a rectangular structure, a horizontal transmitting coil, a central transmitting coil, two offset compensation coils and a plurality of valley-filling coils, wherein the horizontal transmitting coil is located in the middle of the transmitting magnetic conductive sheet and is wound along the long side of the transmitting magnetic conductive sheet, the central transmitting coil is located in the middle of the transmitting magnetic conductive sheet and is wound along the short side of the transmitting magnetic conductive sheet, the two offset compensation coils are respectively located at the two ends of the transmitting magnetic conductive sheet and are both wound along the short side of the transmitting magnetic conductive sheet, and a plurality of valley-filling coils are respectively included between the offset compensation coil at each end and the central transmitting coil, and each valley-filling coil is wound along the short side of the transmitting magnetic conductive sheet; the short side and the long side of the transmitting magnetic conductive sheet are not less than the corresponding side length of the receiving magnetic conductive sheet; Determine the vertical distance between the receiving magnetic conductive sheet and the transmitting magnetic conductive sheet which are arranged in parallel and spaced apart from each other; Initializing a coil turn combination, wherein the coil turn combination includes the turns of all coils in the receiving structure and the transmitting structure; Under the current coil turns combination, based on the structural design of the receiving structure, the structural design of the transmitting structure and the vertical distance between the two, calculating whether the anti-lateral offset cross solenoid coupling mechanism meets the target anti-lateral offset parameter requirements; When the target anti-lateral deviation parameter requirement is not met, the coil turns combination is adjusted until the target anti-lateral deviation parameter requirement is met, and the anti-lateral deviation cross solenoid coupling mechanism for constructing a wireless charging system is designed.

5. The method according to claim 4, characterized in that Calculating whether the anti-lateral deviation cross solenoid coupling mechanism meets the target anti-lateral deviation parameter requirements includes: calculating whether a requirement is met that an error amount between a total mutual inductance between a coil in the receiving structure and a coil in the transmitting structure does not exceed an error threshold when the receiving structure is located at each lateral offset position of the transmitting structure; When the requirement is met, it is determined that the anti-lateral deviation cross solenoid coupling mechanism meets the target anti-lateral deviation parameter requirement; otherwise, it is determined that the target anti-lateral deviation parameter requirement is not met.

6. The method according to claim 5, characterized in that The long side of the transmitting magnetic conductive sheet is parallel to the long side of the receiving magnetic conductive sheet, and the short side of the transmitting magnetic conductive sheet is parallel to the short side of the receiving magnetic conductive sheet; The total mutual inductance at each lateral offset position includes the mutual inductance between the horizontal transmitting coil and the first receiving coil , the mutual inductance between the central transmitting coil and the second receiving coil , a mutual inductance between an offset compensation coil and the second receiving coil , the mutual inductance between another offset compensation coil and the second receiving coil ; Mutual inductance between each valley-filling coil and the second receiving coil , the total mutual inductance at the lateral offset position ; And any two coils and coil Mutual induction ,in, It is a coil The length vector of It is a coil The length vector of It is a coil The length vector of the infinitesimal, It is a coil The length vector of the infinitesimal, Is the current lateral offset position and The distance between It is a coil The number of turns under the current coil turns combination, It is a coil The number of turns under the current coil turns combination, is the magnetic permeability of vacuum.

7. The method according to claim 4, characterized in that Initializing the coil turns combination includes: determining the turns of the first receiving coil , the number of turns of the second receiving coil , the number of turns of the horizontal transmitting coil , the number of turns of the central transmitting coil , Initialize the number of turns of each offset compensation coil , Initialize the number of turns of each valley filling coil ; Adjusting the coil turns combination includes adjusting the turns of each offset compensation coil and the turns of each valley filling coil, and keeping the turns of other coils unchanged; The method of adjusting the coil turn combination until the target anti-lateral offset parameter requirement is met includes: Calculate the total mutual inductance when the receiving structure is located in the middle of the transmitting structure , and calculate the total mutual inductance when the receiving structure is located at the winding position of a valley-filling coil , increase the number of turns of the valley-filling coil wound at the current position, and recalculate the total mutual inductance Total Mutual Inductance , until the total mutual inductance Total Mutual Inductance When the error between the two does not exceed the error threshold, the number of turns of the valley-filling coil wound at the current position is obtained. ; Calculate and obtain the number of turns of each valley-filling coil at the lateral offset position corresponding to each valley-filling coil ; Based on the number of turns of other coils that have been determined, the total mutual inductance when the receiving structure is located in the middle of the transmitting structure is calculated. , and calculate the total mutual inductance when the receiving structure is located at the offset compensation coil at each end , increase the number of turns of the offset compensation coil in sequence, and recalculate the total mutual inductance Total Mutual Inductance , until the total mutual inductance Exceeding the total mutual inductance When , the number of turns of the offset compensation coil wound at the current position is obtained ; Calculate and obtain the number of turns of each offset compensation coil at the lateral offset position corresponding to the offset compensation coil at both ends .

8. The method according to claim 7, characterized in that The method further comprises: The number of turns of the offset compensation coil is increased in sequence. In the process of calculating the total mutual inductance Exceeding the total mutual inductance The final number of turns of the offset compensation coil is obtained by adding a predetermined additional number of turns to the number of turns of the offset compensation coil. .

9. The method according to claim 4, characterized in that The method further comprises: After adjusting to obtain a coil turn combination that meets the target anti-lateral offset parameter requirements, finite element simulation is performed according to the coil turn combination, the structural design of the receiving structure, the structural design of the transmitting structure, and the vertical distance therebetween; when the simulation result indicates that the anti-lateral offset cross solenoid coupling mechanism meets the target anti-lateral offset parameter requirements, the anti-lateral offset cross solenoid coupling mechanism is designed; When the simulation results indicate that the anti-lateral deviation cross solenoid coupling mechanism does not meet the target anti-lateral deviation parameter requirements, the number of turns of the horizontal transmitting coil is adjusted. and the number of turns of the central transmitting coil And reinitialize the coil turns combination, and adjust the coil turns combination again.

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