Decoupling coil for wireless electric energy and information synchronous transmission system

Abstract

The invention relates to a decoupling coil for a wireless electric energy and information synchronous transmission system, belongs to the technical field of wireless transmission systems, and solves the problems that in the prior art, when a decoupling coil generates relative offset, coupling is generated, complete decoupling is not needed any more, and mutual interference exists between energy transmission and information transmission. Comprising a transmitting end and a receiving end; the transmitting end sequentially comprises a transmitting ferrite magnetic core, an energy transmitting coil and an information transmitting coil from outside to inside; wherein the energy transmitting coil and the information transmitting coil are DD type coils, are overlapped with each other, are aligned in central position and are orthogonally placed; the receiving end sequentially comprises a receiving ferrite magnetic core, an energy receiving coil and an information receiving coil from outside to inside; wherein the energy receiving coil and the information receiving coil are DD type coils, are overlapped with each other, are aligned in central position and are orthogonally placed.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless transmission systems, and in particular to a decoupling coil used in a wireless power and information synchronous transmission system. Background Art

[0002] Wireless power transmission technology has been widely used because of its safety, convenience, flexibility and reliability. In many applications, it is necessary not only to realize the wireless transmission of electric energy, but also to realize the wireless transmission of information, that is, the wireless power and information synchronous transmission technology. When the power of the wireless power transmission system is large, the reliability of radio frequency communication is reduced. Therefore, magnetic coupling communication technology is used for the wireless power transmission application environment.

[0003] There are three main types of magnetic coupling communication technology: dual coupling communication technology, energy modulation communication technology, and injection communication technology. Dual coupling communication technology uses two sets of coupling coils to achieve power transmission and information transmission respectively, but this method increases the size of the equipment due to the addition of a set of information coupling coils, and there is cross coupling between the two sets of coils, which interfere with each other. Power transmission will cause serious interference to information transmission. Energy modulation communication technology directly modulates power through FSK (frequency shift keying), ASK (amplitude shift keying) or PSK (phase shift keying). In this way, power and information share the same set of coupling coils, but it will cause power fluctuations and affect the stability of power transmission. In addition, the information transmission rate of this transmission method is limited by the energy carrier frequency. Injection communication technology is that multiple groups of carriers are transmitted through the same set of coupling coils. The frequencies of energy carriers and information carriers are different. There is cross interference between energy transmission and information transmission. The use of wave blockers can separate energy transmission and information transmission, but wave blockers have a great impact on the energy transmission efficiency, equipment size, cost, etc. of the system.

[0004] The current dual-coupling communication technology system structure is as follows Figure 1 As shown in the figure, the coupling unit includes two energy transmission coils and two communication coils. The four coils are coupled to each other, and the energy transmission and information transmission are cross-interfered. In order to solve this problem, the coupling unit can adopt a decoupling coil design scheme to make the mutual inductance between the energy transmission coil and the communication coil zero and decouple each other. In the existing decoupling coil design, one group of the energy transmission coil and the communication coil uses a DD structure coil, and the other group uses a rectangular structure coil. The two are integrated together, aligned in the center, and share a ferrite core, such as Figure 2 As shown in the figure, since the mutual inductance of the DD coil and the rectangular coil is zero when aligned, the energy transmission coil and the communication coil are decoupled from each other, thereby eliminating the cross interference between energy transmission and information transmission.

[0005] However, in actual working conditions, due to manufacturing process errors and mechanical vibrations, it is difficult to completely decouple the DD coil and the rectangular coil. When the relative positions of the two coils are offset, coupling will occur, causing cross-interference between energy transmission and information transmission. Summary of the invention

[0006] In view of the above analysis, an embodiment of the present invention aims to provide a decoupling coil for a wireless power and information synchronous transmission system, so as to solve the problem that the existing decoupling coil produces coupling when relative offset occurs, is no longer completely decoupled, and there is mutual interference between energy transmission and information transmission.

[0007] The embodiment of the present invention provides a decoupling coil for a wireless power and information synchronous transmission system, including a transmitting end and a receiving end;

[0008] The transmitting end includes, from the outside to the inside, a transmitting ferrite core, an energy transmitting coil and an information transmitting coil; wherein the energy transmitting coil and the information transmitting coil are both DD-type coils, and overlap each other, with their centers aligned and placed orthogonally;

[0009] The receiving end includes a receiving ferrite core, an energy receiving coil and an information receiving coil from the outside to the inside; wherein the energy receiving coil and the information receiving coil are both DD-type coils, and overlap each other, align their centers, and are orthogonally placed.

[0010] Furthermore, the design parameters of the transmitting end and the receiving end are obtained based on the parameter design method of the decoupling coil, wherein the design parameters include the size of the magnetic core, the size of each coil, the number of turns of each coil and the wire diameter.

[0011] Furthermore, the parameter design method of the decoupling coil includes:

[0012] Based on the performance indicators given by the system, the size of the energy coil is taken as the optimization variable, and the relationship between the size of the energy coil and the coupling coefficient is simulated and analyzed, and then the size of the energy coil is selected; wherein the energy coil includes an energy transmitting coil and an energy receiving coil;

[0013] Determine the size of the magnetic core and the size of the information coil according to the selected energy coil size; wherein the information coil includes an information transmitting coil and an information receiving coil;

[0014] Taking the number of turns of the energy coil as the optimization variable, the relationship between the number of turns of the energy coil and its mutual inductance is simulated and analyzed to select the number of turns of the energy coil;

[0015] Taking the number of turns of the information coil as the optimization variable, the relationship between the number of turns of the information coil and its self-inductance is simulated and analyzed to obtain the corresponding compensation capacitor value, and then the number of turns of the information coil is determined according to the compensation capacitor.

[0016] Based on the above parameters, the working current of the energy coil and the information coil is obtained, and then the wire diameter is selected.

[0017] Furthermore, the size of the magnetic core and the size of the information coil are determined by:

[0018] The size of the magnetic core is the same as the size of the energy coil;

[0019] The size of the information coil is 0.5 to 1 times the size of the energy coil.

[0020] Furthermore, the energy transmitting coil and the energy receiving coil have the same size and are both square coils.

[0021] Furthermore, the size of the energy coil corresponding to the coupling coefficient value of 0.1 is selected as the energy coil size.

[0022] Further, the number of energy coil turns corresponding to when the difference between the mutual inductance value of the energy coil and the optimal mutual inductance value is less than a set threshold is selected as the number of energy coil turns.

[0023] Furthermore, the optimal mutual inductance of the energy coil is obtained by the following formula:

[0024]

[0025] in,

[0026] ω0=2πf0

[0027]

[0028] Where, M represents the mutual inductance between the energy transmitting coil and the energy receiving coil, f0 represents the wireless energy transmission operating frequency; R L Indicates the load connected after the rectifier bridge on the wireless energy transmission channel.

[0029] Furthermore, the performance indicators of the system include transmission distance, transmission power, transmission efficiency and operating frequency.

[0030] Furthermore, the thickness of the magnetic core is 3 to 5 mm.

[0031] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0032] The present invention provides a decoupling coil for a wireless power and information synchronous transmission system. Both the energy and information coils at the transmitting end and the receiving end adopt DD coils. When a relative offset occurs, the coupling coefficient between the energy coil and the information coil is always approximately equal to zero, close to a mutually decoupled state, thereby greatly improving the anti-interference performance of the system.

[0033] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0035] Figure 1 It is a schematic diagram of the structure of the traditional dual-coupling communication technology system;

[0036] Figure 2 (a) Schematic diagram of the decoupling coil for existing rectangular coils to transmit energy and DD coils to transmit information;

[0037] Figure 2 (b) Schematic diagram of the decoupling coil in which the existing rectangular coil transmits information and the DD coil transmits energy;

[0038] Figure 3 It is a schematic diagram of the mutual coupling between the energy coil and the information coil;

[0039] Figure 4 A schematic diagram of the three-dimensional structure of a decoupling coil for a wireless power and information synchronous transmission system provided in this embodiment;

[0040] Figure 5 This is a schematic diagram of the planar structure of a decoupling coil for a wireless power and information synchronous transmission system provided in this embodiment;

[0041] Figure 6 The wireless energy and information synchronous transmission circuit provided in this embodiment;

[0042] Figure 7 This is a curve showing the relationship between the energy coil size and the coupling coefficient provided in this embodiment;

[0043] Figure 8 The relationship curve between the number of turns of the energy coil and the mutual inductance value provided in this embodiment;

[0044] Fig. 9 (a), (b), and (c) are plan views of two conventional decoupling coils provided in this embodiment and the decoupling coil in this embodiment;

[0045] Fig.10 It is a simulation schematic diagram of three decoupling coil offsets provided in this embodiment. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0047] In the wireless power transmission circuit, the DC power supply is converted into a high-frequency AC voltage by an inverter, and then injected into the energy transmitting coil after passing through the compensation network to generate a high-frequency electromagnetic field. The high-frequency electromagnetic field is coupled to the energy receiving coil to induce a high-frequency electromotive force. After passing through the compensation network and rectification and filtering, a stable power supply is obtained to supply the load; in the wireless information transmission circuit, Utd is the digital signal to be transmitted. After passing through the modulation circuit and the compensation network, a high-frequency AC current is generated, which is injected into the information transmitting coil to generate a high-frequency electromagnetic field. The high-frequency electromagnetic field is coupled to the information receiving coil to induce a high-frequency electromotive force. After passing through the compensation network and the demodulation circuit, the transmitted digital signal Urd is obtained. Here, the data transmission rate is not limited by the operating frequency of the energy transmission system, and no complex data loading and extraction circuits are required. However, the mutual coupling between the energy coil and the information coil in the dual coupling channel may cause cross interference. The coupling diagram is shown in the figure. Figure 3 As shown. The existing decoupling coils use DD coils and rectangular coils, which produce coupling when relative offset occurs, and are no longer completely decoupled, and there is mutual interference between energy transmission and information transmission; this embodiment proposes a decoupling coil, which uses DD coils. Compared with the existing decoupling coils, when relative offset occurs, the coupling effect between the energy transmission coil and the communication coil is smaller, and is closer to a mutual decoupling state, thereby improving the anti-interference performance of the system.

[0048] A specific embodiment of the present invention discloses a decoupling coil for a wireless power and information synchronous transmission system, such as Figure 4 and Figure 5 As shown, it includes a transmitting end and a receiving end;

[0049] The transmitting end includes, from the outside to the inside, a transmitting ferrite core, an energy transmitting coil p1 and an information transmitting coil s1; wherein the energy transmitting coil p1 and the information transmitting coil s1 are both DD-type coils, and overlap each other, with their centers aligned and placed orthogonally;

[0050] The receiving end includes a receiving ferrite core, an energy receiving coil p2 and an information receiving coil s2 from the outside to the inside; wherein the energy receiving coil p2 and the information receiving coil s2 are both DD-type coils, and overlap each other, align the center positions, and are orthogonally placed;

[0051] Specifically, the transmitting ferrite core and the receiving ferrite core are both rectangular thin plates and have the same size.

[0052] Specifically, the shape and size of the transmitting end and the receiving end are exactly the same, and their self-inductance is also the same.

[0053] More specifically, if Figure 4 As shown, the length of the transmitting ferrite core along the Y direction is lc1, the length along the X direction is wc1, and the thickness along the Z direction is tc1. Similarly, the length of the receiving ferrite core along the Y direction is lc2, the length along the X direction is wc2, and the thickness along the Z direction is tc2; the lengths of the energy transmitting coil, the energy receiving coil, the information transmitting coil and the information receiving coil along the Y direction are l1, l2, l3, l4, respectively, the lengths along the X direction are w1, w2, w3, w4, respectively, and the thicknesses along the Z direction are t1, t2, t3, t4, respectively.

[0054] It can be understood that the existing decoupling coil is a combination of a DD coil and a rectangular coil, which can be decoupled and is relatively simple to manufacture; the coils in this embodiment are all DD coils, which are more complicated to wind, but have better anti-deviance performance.

[0055] During implementation, the design parameters of the transmitting end and the receiving end are obtained based on the parameter design method of the decoupling coil, wherein the design parameters include the size of the magnetic core, the size of each coil, the number of turns of each coil, and the wire diameter.

[0056] In specific implementation, the parameter design method of the decoupling coil includes:

[0057] S1. Based on the performance indicators given by the system, taking the size of the energy coil as the optimization variable, the relationship between the size of the energy coil and the coupling coefficient is simulated and analyzed, and then the size of the energy coil is selected; wherein the energy coil includes an energy transmitting coil and an energy receiving coil.

[0058] Specifically, the performance indicators of the system include transmission distance, transmission power, transmission efficiency and operating frequency.

[0059] Specifically, the energy transmitting coil and the energy receiving coil have the same size and are both square coils.

[0060] Specifically, by substituting the size of the energy coil into the finite element simulation model, the self-inductance and mutual inductance of the energy coil are obtained, and the coupling coefficient k is calculated according to the following formula: p :

[0061]

[0062] Where L1 and L2 represent the self-inductance of the energy transmitting coil and the energy receiving coil respectively, and M 12 Represents the mutual inductance between the energy transmitting coil and the energy receiving coil.

[0063] By changing the size of the energy coil, a curve between the energy coil size and the coupling coefficient can be obtained, and then the corresponding energy coil size can be selected according to the demand for the coupling coefficient.

[0064] Specifically, the size of the energy coil corresponding to the coupling coefficient value of 0.1 is selected as the energy coil size.

[0065] S2. Determine the size of the magnetic core and the size of the information coil according to the selected energy coil size; wherein the information coil includes an information transmitting coil and an information receiving coil;

[0066] Specifically, the size of the magnetic core and the size of the information coil are determined in the following manner:

[0067] The size of the magnetic core is the same as the size of the energy coil;

[0068] The size of the information coil is 0.5 to 1 times the size of the energy coil.

[0069] Preferably, the thickness of the magnetic core is 3-5 mm.

[0070] It should be noted that, under the conditions of meeting the installation requirements, the size of the information coil should be as large as possible, that is, as close as possible to the size of the energy coil, in order to improve the coupling effect.

[0071] It can be understood that the magnetic core and the energy coil have the same outer dimensions, which can maximize the energy transmission coupling coefficient under given size constraints.

[0072] S3. Taking the number of turns of the energy coil as the optimization variable, simulate and analyze the relationship between the number of turns of the energy coil and its mutual inductance value, and select the number of turns of the energy coil;

[0073] Specifically, by substituting the number of turns and size of the energy coil into the finite element simulation model, the self-inductance and mutual inductance of the energy coil are simulated; by changing the number of turns of the energy coil, the curve between the number of turns of the energy coil and the mutual inductance value can be obtained.

[0074] Specifically, the energy coil turns corresponding to the energy coil mutual inductance value when the difference between the energy coil mutual inductance value and the optimal mutual inductance value is less than the set threshold are selected as the energy coil turns. Preferably, the energy coil turns corresponding to the energy coil mutual inductance value when the energy coil mutual inductance value is closest to the optimal mutual inductance value are selected as the energy coil turns.

[0075] Specifically, the optimal mutual inductance value of the energy coil is obtained by the following formula:

[0076]

[0077] in,

[0078] ω0=2πf0

[0079]

[0080] Where, M represents the mutual inductance between the energy transmitting coil and the energy receiving coil, f0 represents the wireless energy transmission operating frequency; RL Indicates the load connected after the rectifier bridge on the wireless energy transmission channel.

[0081] S4. Taking the number of turns of the information coil as the optimization variable, simulate and analyze the relationship between the number of turns of the information coil and its self-inductance, and then obtain the corresponding compensation capacitor value, and then determine the number of turns of the information coil according to the compensation capacitor.

[0082] Specifically, by substituting the number of turns and size of the information coil into the finite element simulation model, the self-inductance value of the energy coil is simulated; by changing the number of turns of the information coil, the curve between the number of turns of the information coil and the self-inductance value can be obtained, and then the relationship with the compensation capacitor capacitance can be obtained to determine the compensation capacitor capacitance.

[0083] More specifically, the compensation capacitor value is obtained by the following formulas:

[0084]

[0085]

[0086] in,

[0087] ω1=2πf1

[0088] Wherein, f1 represents the wireless communication operating frequency, L3 and L4 represent the self-inductance values ​​of the information transmitting coil and the information receiving coil respectively, and C3 and C4 represent the compensation capacitance of the information transmitting coil and the information receiving coil respectively.

[0089] More specifically, the number of turns of the information coil is determined according to the difficulty of selecting the compensation capacitor.

[0090] S5. Based on the above parameters, the working current of the energy coil and the information coil is obtained, and then the wire diameter is selected.

[0091] Specifically, the operating currents of the energy coil and the information coil may be obtained by calculation or simulation according to the prior art.

[0092] Specifically, the wire cross-sectional area is obtained based on the working current of the energy coil and the information coil, and the wire diameter of the energy coil and the information coil can be determined:

[0093]

[0094]

[0095] In the formula, S p , S s Respectively represent the wire cross-sectional area of ​​the energy coil and the information coil, I p ,I sThey represent the working current of the energy coil and the information coil respectively, and J represents the current density. More specifically, the current density J is generally selected to be 4 to 6A / mm2.

[0096] Exemplarily, the performance indicators of the system are shown in Table 1.

[0097] Table 1 System performance parameters

[0098] Performance Indicators Numeric Transmission distance 200mm Transmission power 2kW Wireless power transmission carrier frequency 85kHz Wireless communication carrier frequency 10MHz

[0099] The energy transmitting coil and the energy receiving coil have the same size and are both square coils, that is, l1=l2=w1=w2. The relationship between the coil size and the coupling coefficient is analyzed by taking the coil size l1 as the optimization variable, as shown in Figure 7 As shown, to ensure the energy transmission efficiency, the coupling coefficient is generally greater than 0.1. Considering that the coil size is too large, the occupied area and weight are too large, here l1 is taken as 420mm;

[0100] The length and width of the magnetic core are also 420mm, and the thickness of the magnetic core is selected to be 3mm; there is no installation restriction for the information coil, and the size is selected to be the maximum value, which is the same as the size of the energy coil, that is, l3=l4=w3=w4=420mm.

[0101] Regarding the energy coil, the working current in the coil satisfies equation (1). When the working currents in the transmitting coil and the receiving coil are equal, the energy transmission efficiency is the highest. At this time, the mutual inductance value satisfies equation (2). The number of coil turns can be obtained based on the mutual inductance value.

[0102]

[0103]

[0104] Where f0 is the operating frequency of wireless energy transmission, ω0 is the corresponding operating angular frequency, M is the mutual inductance between the energy transmitting coil and the energy receiving coil, I1 and I2 are the currents in the energy transmitting coil and the energy receiving coil respectively, P is the power transmitted from the energy transmitting coil to the energy receiving coil, and R L is the load connected after the rectifier bridge, R eq It is the equivalent load before the rectifier bridge.

[0105] According to equations (1) and (2), the optimal mutual inductance corresponding to the highest transmission efficiency is 45.5 μH. Based on the relationship between the number of turns and the mutual inductance in the first step, Figure 8 As shown, therefore, the energy coil is designed to have 14 turns, and the corresponding mutual inductance value is 43.6μH, which is closest to the optimal inductance value.

[0106] Regarding the information coil, the compensation capacitance values ​​corresponding to different turns are shown in Table 2. When the number of turns increases, the compensation capacitance value is too small to be selected, so 1 to 2 turns can be selected. In this embodiment, 1 turn is designed, and the self-inductance value of the information coil is 5.39μH.

[0107] Table 2 Information on the compensation capacitance values ​​corresponding to different coil turns

[0108] Coil turns 1 2 3 4 Compensation capacitor value 46.95pF 11.73pF 1.3pF 0.08pF

[0109] According to the above calculation, the effective value of the working current of the energy coil is about 9A, and 0.1*600Litz wire can be selected. The working current of the information coil is very small, generally at the mA level, and 0.1*100Litz wire can be selected.

[0110] In summary, the core and coil sizes, the number of turns of the coil and the wire coil have been selected, and the parameter design of the new decoupling coil has been completed.

[0111] More specifically, Figure 6 This is the circuit diagram of the wireless power and information synchronous transmission system. Energy transmission and information transmission use different coupling channels. The wireless power transmission part consists of four parts: full-bridge inverter (Ⅰ), compensation network (Ⅱ), energy transmission magnetic coupling mechanism (Ⅲ), and rectifier filter circuit (Ⅳ); the wireless information transmission part (Ⅴ) consists of four sub-modules: signal modulation circuit, information transmission magnetic coupling mechanism, compensation network, and demodulation circuit. Among them, the self-inductance of the energy transmitting coil is L1, which is connected to the wireless energy transmitting channel formed by the full-bridge inverter and the compensation network. The self-inductance of the energy receiving coil is L2, which is connected to the wireless energy receiving channel formed by the rectifier bridge and the compensation network. The mutual inductance between the energy transmitting coil and the energy receiving coil is M 12 The self-inductance of the information transmitting coil is L3, which is connected to the wireless information transmitting channel composed of the transmitting end modulation circuit and the compensation network. The self-inductance of the information receiving coil is L4, which is connected to the wireless information receiving channel composed of the receiving end demodulation circuit and the compensation network. The mutual inductance between the information transmitting coil and the information receiving coil is M 34 .

[0112] In order to verify the effectiveness of the decoupling coil described in this embodiment, the decoupling coil in this embodiment is compared and analyzed with two existing decoupling coils. Fig. 9 As shown, for the existing decoupling coil structure ( Fig. 9 (a) Fig. 9 (b)), let the two window center points of DD coil (such as Fig. 9 The connecting line of the decoupling coil structure (shown by the black solid dots in the middle) is along the Y-axis direction. Fig. 9 (c)), assume that the connecting line of the center points of the two windows of the DD energy transmission coil is along the Y-axis direction.

[0113] Assume that Lp and Ls represent the self-inductance of the energy coil and the information coil respectively, Mps represents the mutual inductance between the energy coil and the information coil, and the coupling coefficient k between the energy coil and the information coil is defined as:

[0114]

[0115] When the energy transmission coil and the communication coil are relatively offset along the X direction, the coupling coefficients corresponding to the three decoupling coil structures are never zero, and the energy transmission coil and the communication coil are always in a decoupled state. However, when the energy transmission coil and the communication coil are relatively offset along the Y direction, the coupling coefficient changes with the offset curve as shown in Fig.10 shown.

[0116] It can be seen that as the offset increases, the two existing decoupling coil structures are no longer decoupled, and the coupling coefficient increases with the offset distance; however, the coupling coefficient of the new decoupling coil is always close to zero when the offset occurs, and they are decoupled from each other. Compared with the three structures, the coupling coefficient of the new structure is the smallest when the offset occurs along the X direction, and the cross interference between the energy transmission coil and the communication coil in this structure is the smallest.

[0117] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0118] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A decoupling coil for a wireless power and information synchronous transmission system, characterized in that: Includes a transmitter and a receiver; The transmitting end includes, from the outside to the inside, a transmitting ferrite core, an energy transmitting coil and an information transmitting coil; wherein the energy transmitting coil and the information transmitting coil are both DD-type coils, and overlap each other, with their centers aligned and placed orthogonally; The receiving end includes a receiving ferrite core, an energy receiving coil and an information receiving coil from the outside to the inside; wherein the energy receiving coil and the information receiving coil are both DD-type coils, and overlap each other, align their centers, and are orthogonally placed.

2. The decoupling coil for a wireless power and information synchronous transmission system according to claim 1, characterized in that: The design parameters of the transmitting end and the receiving end are obtained based on the parameter design method of the decoupling coil, wherein the design parameters include the size of the magnetic core, the size of each coil, the number of turns of each coil and the wire diameter.

3. The decoupling coil for the wireless power and information synchronous transmission system according to claim 2, characterized in that: The parameter design method of the decoupling coil includes: Based on the performance indicators given by the system, the size of the energy coil is taken as the optimization variable, and the relationship between the size of the energy coil and the coupling coefficient is simulated and analyzed, and then the size of the energy coil is selected; wherein the energy coil includes an energy transmitting coil and an energy receiving coil; Determine the size of the magnetic core and the size of the information coil according to the selected energy coil size; wherein the information coil includes an information transmitting coil and an information receiving coil; Taking the number of turns of the energy coil as the optimization variable, the relationship between the number of turns of the energy coil and its mutual inductance value is simulated and analyzed to select the number of turns of the energy coil; Taking the number of turns of the information coil as the optimization variable, the relationship between the number of turns of the information coil and its self-inductance is simulated and analyzed to obtain the corresponding compensation capacitor value, and then the number of turns of the information coil is determined according to the compensation capacitor. Based on the above parameters, the working current of the energy coil and the information coil is obtained, and then the wire diameter is selected.

4. The decoupling coil for a wireless power and information synchronous transmission system according to claim 3, characterized in that: The core size and information coil size are determined as follows: The size of the magnetic core is the same as the size of the energy coil; The size of the information coil is 0.5 to 1 times the size of the energy coil.

5. The decoupling coil for a wireless power and information synchronous transmission system according to claim 3, characterized in that: The energy transmitting coil and the energy receiving coil have the same size and are both square coils.

6. The decoupling coil for a wireless power and information synchronous transmission system according to claim 3, characterized in that: The size of the energy coil corresponding to the coupling coefficient value of 0.1 is selected as the energy coil size.

7. The decoupling coil for a wireless power and information synchronous transmission system according to claim 3, characterized in that: The number of energy coil turns corresponding to when the difference between the energy coil mutual inductance value and the optimal mutual inductance value is less than a set threshold is selected as the number of energy coil turns.

8. The decoupling coil for a wireless power and information synchronous transmission system according to claim 7, characterized in that: The optimal mutual inductance value of the energy coil is obtained by the following formula: in, ω0=2πf0 Where, M represents the mutual inductance between the energy transmitting coil and the energy receiving coil, f0 represents the wireless energy transmission operating frequency; R L Indicates the load connected after the rectifier bridge on the wireless energy transmission channel.

9. The decoupling coil for a wireless power and information synchronous transmission system according to claim 3, characterized in that: The performance indicators of the system include transmission distance, transmission power, transmission efficiency and operating frequency.

10. The decoupling coil for a wireless power and information synchronous transmission system according to claim 3, characterized in that: The core thickness is 3 to 5 mm.

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