Flexible coil array wireless power transmission method and device for train windshield and application

Abstract

The invention relates to the field of wireless electric energy transmission, provides a flexible coil array wireless electric energy transmission method and device for a train windshield and application, and aims to solve the problem of coupling coil self-inductance and mutual inductance parameter fluctuation caused by three-dimensional vibration of a high-speed train windshield folding shed. And the problems of insufficient wireless electric energy transmission power stability and unstable output voltage caused by the fact that a traditional rigid coil structure and a fixed compensation network are difficult to adapt to dynamic deformation are solved. According to the main technical scheme, the flexible coil array is formed by connecting a plurality of square flexible coils in series, is wound by a litz wire formed by twisting a plurality of strands of independent insulated conductors, and is attached to the two sides of windshield folding shed cloth; the magnetic shielding structure is composed of flexible rubber soft magnetic sheets and used for guiding magnetic field distribution and restraining eddy current interference of the metal supporting structure; and the LCC-S compensation network realizes decoupling of current and self-inductance change of the transmitting coil through resonance matching so as to maintain constant voltage output. The system is suitable for wireless power supply of monitoring systems of high-speed trains and subway windshields.

Description

Technical Field

[0001] The present invention relates to the field of wireless power transmission and provides a method, device and application of wireless power transmission using a flexible coil array for a train windshield. Background Art

[0002] During high-speed train operation, windshields serve as a key flexible connection between carriages, and their stability is crucial to train safety, stability, and passenger comfort. As train speeds continue to increase, the mechanical environment in which windshields operate becomes increasingly complex. The bellows structure deforms at high speeds due to factors such as airflow and train turns, causing it to expand, contract, rotate, and twist. Therefore, a detection system within the windshield is particularly important.

[0003] Traditional wired power supply methods compromise the airtight structure of the windshield bellows cavity. Furthermore, the windshield's unique, non-removable construction makes installing energy storage devices like batteries impractical, making them unable to meet the power supply requirements of the windshield condition monitoring system. Wireless power transmission technology, which enables power transmission without the need for electrical connections, is an ideal solution for solving the power supply issues of windshield monitoring systems.

[0004] Vibratory deformation of the windshield bellows can cause bending of the coupling coils in wireless power transmission systems, leading to changes in the coils' self-inductance and mutual inductance, affecting the system's power transmission stability. Existing technologies struggle to adapt to the dynamic deformation of the windshield bellows, resulting in significant fluctuations in the coupling coil parameters and impacting the output characteristics of the wireless power supply system. Furthermore, conventional compensation network structures struggle to achieve a stable constant voltage output when responding to coil parameter fluctuations, failing to meet the power supply stability requirements of windshield monitoring systems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of fluctuations in the self-inductance and mutual inductance parameters of the coupling coil caused by the three-dimensional vibration of the windshield bellows of high-speed trains, as well as the problem of insufficient wireless power transmission power stability and unstable output voltage caused by the difficulty of traditional rigid coil structures and fixed compensation networks to adapt to dynamic deformation.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical means:

[0007] The present invention provides a flexible coil array wireless power transmission device for a train windshield, comprising:

[0008] A flexible coil array, comprising a plurality of square flexible coils connected in series, each of which is wound with Litz wire consisting of multiple strands of independently insulated conductors, and is attached to both sides of the flexible rubber tarpaulin adjacent to the fixed end of the train windshield bellows;

[0009] A magnetic shielding structure is provided on both sides of the square flexible coil and is composed of a flexible rubber soft magnetic sheet, and is used to guide the magnetic field distribution and suppress the eddy current interference of the metal support structure;

[0010] LCC-S compensation network, including primary compensation inductor L1 and capacitor C1, secondary compensation capacitor C s , the decoupling of the transmitting coil current and self-inductance changes is achieved through resonant matching to maintain constant voltage output.

[0011] In the above scheme, the transmitting coil size of the square flexible coil is 50mm×50mm, the receiving coil size is 45mm×45mm, the transmission distance between the transmitting coil and the receiving coil is 4mm, and the square flexible coil disperses the influence of deformation on a single coil through conformal bending when the windshield bellows deforms.

[0012] In the above scheme, the transmitting coil has an outer diameter of 50 mm and an inner diameter of 20 mm, and the receiving coil has an outer diameter of 45 mm and an inner diameter of 19 mm, which are used to compensate for the difference in curvature between the inner and outer sides of the windshield bellows during conformal bending.

[0013] In the above solution, the thickness of the flexible rubber soft magnetic sheet in the magnetic shielding structure is 0.5mm-2mm, and its magnetic permeability ranges from 100-500H / m. The magnetic field concentration effect is used to increase the self-inductance and mutual inductance of the coil and reduce the influence of metal environment interference on the coupling parameters.

[0014] In the above solution, in the LCC-S compensation network, the resonant frequency of the primary compensation inductor L1 and the capacitor C1 satisfies the formula:

[0015]

[0016] Secondary side compensation capacitor C s and the receiving coil self-inductance L s The resonance condition is:

[0017]

[0018] The compensation component parameters are determined through an iterative design process to achieve constant voltage output at the load end.

[0019] The device described in the above solution is suitable for wireless power supply of the monitoring system of high-speed train windshields, subway windshields or intercity train windshields.

[0020] The present invention also provides a wireless power transmission method, comprising:

[0021] The flexible coil array is attached to both sides of the windshield bellows cloth, and the eddy current interference of the metal support rod is suppressed through the magnetic shielding structure;

[0022] The LCC-S compensation network is used to decouple the transmitting coil current from the self-inductance change to achieve constant voltage output.

[0023] Because the present invention adopts the above technical means, it has the following beneficial effects:

[0024] 1. The present invention solves the problem of insufficient power transmission stability caused by the fluctuation of the self-inductance and mutual inductance parameters of the coupling coils in the three-dimensional vibration environment of the windshield bellows by adopting the technical means of collaborative design of the square flexible coil array and the magnetic shielding structure, thereby achieving effective suppression of dynamic deformation interference. Specifically, through the square flexible coil structure design of Litz wire material, when the windshield bellows is bent and deformed, the characteristics of its multi-strand conductor twisting can effectively alleviate the problem of increased internal resistance caused by the skin effect. At the same time, the square structure has better parameter anti-disturbance capability than the circular coil. In conjunction with the magnetic shielding optimization of the flexible rubber soft magnetic sheet, the eddy current interference generated by the metal support structure is reduced by guiding the concentrated distribution of the magnetic field. Under the premise of maintaining the conformal bending adaptability of the coil, the magnetic field stability of the coupling mechanism in a dynamic environment is significantly improved. Through the structural layout of the series-connected flexible coil array, this design disperses the deformation stress borne by a single coil to multiple units, thereby reducing the overall mutual inductance fluctuation amplitude and ensuring that stable magnetic coupling characteristics can be maintained under complex deformation conditions such as the stretching and contraction of the windshield bellows.

[0025] 2. The present invention solves the problem of output voltage fluctuation in traditional wireless power transmission system when coupling parameters change by constructing a resonant matching mechanism of LCC-S compensation network, and realizes precise control of constant voltage output at the load end. Specifically, the compensation network achieves resonant matching of primary compensation inductor L1 and capacitor C1 (satisfying ), so that the transmitting coil current is only determined by the input voltage and L1 parameters, and the self-inductance L p Decoupling is achieved by adjusting the winding speed to the desired level. The secondary side adopts an SS compensation topology and, based on a parameter iteration design process of the average self-inductance and the minimum mutual inductance, constructs a compensation component configuration scheme that adapts to dynamic coupling changes. This technical approach effectively eliminates the impact of coil parameter fluctuations caused by windshield vibration on the output characteristics by establishing an independent control relationship between the transmitter-side current and the load-end voltage. In practical applications, this compensation network ensures that the system maintains output voltage stability at different bending angles. By dynamically adjusting the compensation parameters, it achieves efficient energy conversion from the vehicle's 220V mains power to the windshield monitoring system's 5V DC, meeting the power supply reliability requirements of load devices such as sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : Overall block diagram of the windshield wireless power supply system;

[0027] Figure 2 : CRH3 folding windshield structure;

[0028] Figure 3 : Schematic diagram of the coupling mechanism placement;

[0029] Figure 4 : The effect of coil bending on square coils and circular coils;

[0030] Figure 5 : Spatial magnetic field distribution diagram of the coupled coil with soft magnetic sheet;

[0031] Figure 6 : Equivalent circuit diagram of LCC-S compensation network structure;

[0032] Figure 7 : LCC-S circuit component parameter design flow chart;

[0033] Figure 8 : Coupling coil parameter test diagram at different bending angles;

[0034] Figure 9 : Variation diagram of self-inductance and mutual inductance parameters of coupling coils at different bending angles;

[0035] Figure 10 : Schematic diagram of the overall prototype of the wireless power supply system and sensor monitoring system;

[0036] Figure 11 : Schematic diagram of the cooperation between the rubber soft magnetic sheet and the Litz coil;

[0037] 1- Grounding cable, 2- Leaf spring, 3- Leaf spring seat assembly, 4- Grounding busbar, 5- Pedal bracket, 6- Pedal, 7- Floor covering cloth, 8- Mounting frame, 9- Double-layer corrugated awning, 10- Windshield hanging ring plate, 11- Windshield awning cavity, 12- Fixed end, 13- Tent cloth, 14- Metal aluminum frame, 15- Support rod, 16- Rubber soft magnetic sheet, 17- Litz coil. DETAILED DESCRIPTION

[0038] The following is a detailed description of the embodiments of the present invention. Although the present invention will be described and illustrated in conjunction with certain specific embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, modifications or equivalent substitutions of the present invention are intended to fall within the scope of the claims of the present invention.

[0039] In addition, in order to better illustrate the present invention, numerous specific details are given in the following detailed description. It will be understood by those skilled in the art that the present invention can also be implemented without these specific details.

[0040] In the present invention, the influence of windshield deformation on the self-inductance and mutual inductance of the coil is reduced through the flexible structural design of the coupling mechanism, magnetic shielding optimization and LCC-S compensation network design, so as to achieve stable constant voltage power supply without destroying the airtightness of the windshield, thereby meeting the power supply requirements of the windshield wireless monitoring system.

[0041] The present invention adopts the following technical solutions to achieve the above-mentioned purpose: the overall framework of the wireless power supply system is as follows: Figure 1 As shown, the following will focus on the design process of the flexible coil array and LCC-S compensation network.

[0042] (1) Design of series flexible coil array and magnetic shielding structure

[0043] The optimal installation position of the coupling mechanism was determined by analyzing the vibration state of the windshield bellows structure during high-speed train operation. Then, the coupling mechanism model under the windshield bellows vibration environment was calculated and analyzed. A design method for the coupling mechanism under this specific environment was proposed.

[0044] The first step is to select the location of the coupling mechanism. Figure 2 The windshield inside it will undergo three-dimensional deformation and vibration under the action of high-speed airflow turbulence and turning force (tension / compression). To achieve wireless power transmission in the windshield cavity, the coupling coil must avoid metal obstacles (eddy current effect), so it is attached to both sides of the flexible rubber awning cloth; considering the extreme working conditions where the structure is stretched to a plane or contracted into a semi-ellipse with small curvature on both sides, and based on the windshield vibration mode, the swing amplitude of the fixed end is small. In order to improve power stability, the coupling mechanism is placed on the side of the awning cloth near the fixed end, such as Figure 3 shown.

[0045] The second step is the design of the coil, which mainly includes the selection of materials, shape, and size. The transmitting and receiving coils of the inductively coupled wireless power transmission system work in a high-frequency alternating magnetic field. Because the skin effect of the wire will increase the internal resistance and system loss, the high-frequency system needs to use multiple strands of independently insulated conductors twisted together to form a Litz wire coil to meet the transmission requirements. In terms of shape design, both circular and square coils are suitable for coupling mechanisms that are directly facing the energy transmission. When the three-dimensional low-frequency vibration of the windshield folding canopy causes the attached coupling coil to dynamically bend and deform, the self-inductance and mutual inductance parameter change characteristics of the two are similar, but the square coil parameter has a slightly better anti-disturbance ability and the mutual inductance value is larger under the same spatial size. For example, the comparison between the two Figure 4 As shown, a square coil structure was adopted. Regarding size design, considering the 120mm canvas length between adjacent metal support rods of the high-speed train windshield bellows and the installation margin, the transmitting coil size was selected as 50mm. The transmission distance between the transmitting and receiving coils attached to the inside and outside of the canvas was set to 4mm. Because the receiving coil bends at a greater angle during conformal bending, the receiving coil size was selected as 45mm to accommodate the effects of deformation.

[0046] Adding a magnetic shielding structure to the coupling mechanism can increase the self-inductance and mutual inductance parameters of the coupling coil and improve the wireless power transmission capability. In addition, there are many metal support structures in the windshield bellows environment, so it is necessary to add a magnetic shielding structure on both sides of the coupling coil to reduce metal interference. Traditional ferrite cores are rigid materials and cannot adapt to the special vibration environment of the windshield bellows. Therefore, this design uses a flexible rubber soft magnetic sheet as a magnetic shielding structure. The magnetic field distribution in the space around the coupling coil with the soft magnetic sheet is as follows: Figure 5 As shown in the figure, adding a soft magnetic sheet makes the magnetic field between the coils more concentrated. When the coil is bent and deformed, the change of the surrounding magnetic field is smaller than when there is no soft magnetic sheet, and the degree of disturbance of the coil self-inductance and mutual inductance parameters is reduced.

[0047] Finally, the flexible coils designed above can be connected in series to form a flexible coil array. When the deformation of the windshield bellows causes the flexible coil array to bend, the multiple flexible coils connected in series can conformally bend to disperse the impact of the deformation on individual coils and reduce the overall mutual inductance fluctuation.

[0048] (2) LCC-S compensation network achieves stable output

[0049] In wireless power systems, coupled coils serve as a crucial tool for energy transmission and reception. To improve the system's transmission power, compensation capacitors are often added to the coil loop to compensate for the reactance generated by the coil's self-inductance, thereby reducing loop impedance and increasing the current in the coil. There are various types of compensation circuits used in wireless power systems, each with its own unique functions and advantages. Basic compensation circuits primarily include series compensation (S-type) and shunt compensation (P-type). These circuits, through different combinations, form four basic resonant compensation topologies at the transmitter and receiver: SS, SP, PS, and PP. These basic topologies are simple, intuitive, easy to analyze, and control, making them a starting point for wireless power system design and optimization. With continuous technological advancements, more complex composite resonant compensation networks, such as LCL and LCC, have been developed. Through carefully designed parameter configurations, these composite topologies successfully decouple the transmitter coil current from the system load. This means that the transmitter coil current remains stable regardless of load fluctuations, which is crucial for maintaining the stability of the system's magnetic field.

[0050] The equivalent circuit of the wireless power supply system based on the LCC-S compensation network structure is established as follows: Figure 6 As shown. Where L p and L s is the self-inductance of the primary and secondary coils, R p and R s is the equivalent AC resistance of the original secondary coil in series, L1, C1, C p and C s is the compensation inductance and capacitance of the primary and secondary sides, R1 is the series equivalent AC resistance value on the inductor L1, M is the mutual inductance value between the primary and secondary coupling coils, RL is the system equivalent load.

[0051] According to Kirchhoff's voltage law, the voltage and current relationship in each loop can be written as shown in Formula 2-1.

[0052]

[0053] When the system is in the initial resonant state, the parameters of the compensation components in the system satisfy:

[0054]

[0055] The output voltage of the system can be expressed as:

[0056]

[0057] When designing the parameters of each component of the wireless power supply system, based on the existing working conditions, it is necessary to first determine the input voltage and system frequency f of the wireless power supply system, and then determine the output voltage and output power based on the power supply requirements of the load. Then, based on the variation range of the self-inductance and mutual inductance parameters of the designed coupling mechanism, determine the average value of the self-inductance of the transmitting coil, the average value of the receiving coil, and the minimum value of the mutual inductance between the coupling coils. Then, replace the changing component parameter values ​​with the average value of the self-inductance and the minimum value of the mutual inductance, select the compensation inductor L1 that meets the output voltage requirements according to Formula 1, and then calculate the required compensation capacitors C1 and C according to Formula 2. p and C s Finally, verify whether the system's output voltage and output power meet the load power supply requirements. If not, reselect the compensation inductor L1 and calculate the corresponding compensation capacitor. The overall circuit component parameter design process is as follows: Figure 7 shown.

[0058] This invention achieves the stability and reliability of wireless power transmission in the vibration environment of high-speed train windshields through the coordinated design of a flexible coil array, a magnetic shielding structure, and an LCC-S compensation network. The specific technical effects are as follows:

[0059] Flexible coil and magnetic shielding structure suppress deformation interference:

[0060] The system significantly suppresses parameter fluctuations. This design utilizes a square flexible coil (wound with Litz wire) in conjunction with a rubber soft magnetic sheet. When the transmitting coil's bending angle increases from 0° to 90°, the transmitting coil's self-inductance drops by only 8.2%, while the receiving coil's self-inductance fluctuates by 8%. The mutual inductance fluctuations in the coupled coils drop from 19.8% in the unshielded state to less than 15%. The soft magnetic sheet concentrates the magnetic path, stabilizing the magnetic field distribution and reducing eddy current interference from the metal support rods. Mutual inductance increases by approximately 10%-20% compared to the unshielded state.

[0061] To enhance adaptability in dynamic environments, the coil is attached to the side of the windshield fabric near the fixed end, where vibration amplitude is minimized. The 50mm size difference between the transmitting coil and the receiving coil (45mm) compensates for the curvature differences during conformal bending, resulting in a smaller outer bending angle and a larger inner bending angle. Experiments have shown that this structure maintains stable coupling within a 4mm transmission distance despite windshield stretching and contraction, avoiding the magnetic coupling failure caused by deformation of traditional rigid coils.

[0062] The meaning of "the coil is attached to the side of the windshield cloth near the fixed end, in the area with the minimum vibration amplitude" is explained in detail as follows:

[0063] This location provides the best wireless power supply stability for the following reasons: Figure 3 The figure shows a schematic diagram of the windshield bellows structure. Based on existing experimental data and modal analysis of windshield modal shapes, the windshield primarily exhibits low-order responses under aerodynamic loads. Because the fixed ends of the windshield bellows are secured to the vehicle body wall via metal screws, the boundary conditions for the force applied are simply supported on opposite sides. Therefore, the closer the windshield bellows are to the fixed ends, the smaller the vibration amplitude. Conversely, the closer the windshield bellows are to their center, the larger the vibration amplitude.

[0064] The greater the vibration amplitude of the windshield bellows away from the fixed end, the greater the coil deformation, the greater the change in the mutual inductance value between the transmitting and receiving coils, and the worse the voltage stability of the receiving end.

[0065] LCC-S compensation network realizes constant voltage output

[0066] The emission current is decoupled from the self-inductance, and the LCC-S topology is resonantly matched by the primary compensation inductor L1 and the capacitor C1 (satisfying ), so that the transmitting coil current depends only on the input voltage and L1, and the coil self-inductance L p The secondary side utilizes an SS compensation topology, combined with an iterative parameter design process, to achieve stable conversion from the vehicle's 220V mains power to the windshield monitoring system's 5V DC. In actual measurements, the output voltage fluctuation was ≤0.99V (7.17V→6.91V) at various bending angles, with a constant 2.5W output power, meeting the sensor's 2W power consumption requirement and achieving a 12% efficiency improvement over the traditional SS topology.

[0067] According to the previous design, the coupling coil is wound as follows Figure 8 As shown, the transmitting coil has an outer diameter of 50 mm and an inner diameter of 20 mm; the receiving coil has an outer diameter of 45 mm and an inner diameter of 19 mm.

[0068] The parameters of the coil under different curvatures were tested on both sides of the PVC pipe wall at different radii. The results of the coil's self-inductance and mutual inductance are as follows: Figure 9The four PVC tubes used have outer diameters of 110mm, 75mm, 50mm, and 32mm, and the corresponding transmitting coil bending angles are 26.0°, 38.2°, 57.3°, and 89.5°.

[0069] When the transmitting coil's bending angle ranges from 0 to 90 degrees, its self-inductance gradually decreases with increasing bending angle, from 18.5 μH to 17.1 μH, an overall decrease of 8.2%. Within the considered range, the receiving coil's self-inductance first increases from a starting point of 12.3 μH to 12.5 μH, then decreases to 11.5 μH, for an overall change of 8% of its maximum self-inductance. The mutual inductance between the transmitting and receiving coils also increases from a starting point of 9.8 μH to 10.6 μH, then decreases to 8.5 μH, for an overall change of 19.8% of its maximum mutual inductance.

[0070] For overall system testing, the experimental prototype is as follows Figure 10 The power transmitting board shown is powered by a standard 50Hz, 220V mains voltage. The high-frequency AC voltage generated by the inverter circuit has a measured frequency of 204kHz. The power transmitting board transmits electrical energy to the power receiving board through a coupling mechanism.

[0071] The wireless power supply system was tested with 2.5W constant power output at four different coil bending angles: 26.0°, 38.2°, 57.3° and 89.5°. The waveforms of the experimental test are shown in the figure below. Figure 5 、 Figure 6 As shown in the figure, the inverter's output voltage and current have a phase difference of approximately 25° at the four different coil bend angles, maintaining a weak inductive response overall. Meanwhile, the output voltages on the secondary rectifier output side are 7.17V, 7.90V, 7.70V, and 6.91V, respectively, with a voltage fluctuation of 0.99V. All of these ensure an output power of 2.5W, meeting the load's power supply requirements.

[0072] The characteristics of the present invention are:

[0073] Collaborative design of flexible coupled coil array and adaptive magnetic shielding structure

[0074] Key points: The use of square flexible coils made of Litz wire material adapts to the three-dimensional vibration deformation of the windshield bellows and suppresses the fluctuations in self-inductance and mutual inductance caused by bending (for example, when the transmitting coil is bent 90°, the self-inductance only drops by 8.2%, and the mutual inductance fluctuation is ≤15%). The innovative use of flexible rubber soft magnetic sheets to replace traditional ferrite cores improves the self-inductance and mutual inductance values ​​through magnetic circuit guidance, while suppressing interference from the metal environment. The use of a series flexible coil array disperses the impact of deformation on individual coils and reduces overall mutual inductance fluctuations.

[0075] (2) Constant voltage output of LCC-S compensation network

[0076] Key Points: Based on the LCC-S topology, the resonant matching of the primary-side compensation inductor L1 and capacitor C1 decouples the transmitting coil current from changes in self-inductance. The current depends solely on the input voltage and L1, and is independent of Lp. The secondary side adopts the SS topology, combined with an iterative parameter design process. Compensation component calculations based on the average self-inductance and minimum mutual inductance were used to develop a comprehensive circuit component parameter design process, ensuring constant voltage output at the load end and meeting the power supply requirements of the detection system.

[0077] Extended protection range:

[0078] Rail transit field: It can be extended to wireless power supply for windshields or flexible connection parts of other models such as subways and intercity trains.

[0079] Industrial flexible equipment: Suitable for wireless power supply scenarios in environments that require dynamic deformation, such as flexible joints of robotic arms, bendable electronic devices (foldable screen devices, flexible sensor arrays).

[0080] Medical implants: Flexible coils and magnetic shielding structures can provide wireless energy that adapts to the movement of human organs.

Claims

1. A flexible coil array wireless power transmission device for a train windshield, characterized in that: include: A flexible coil array, comprising a plurality of square flexible coils connected in series, each of which is wound with Litz wire consisting of multiple strands of independently insulated conductors, and is attached to both sides of the flexible rubber tarpaulin adjacent to the fixed end of the train windshield bellows; A magnetic shielding structure is provided on both sides of the square flexible coil and is composed of a flexible rubber soft magnetic sheet, and is used to guide the magnetic field distribution and suppress the eddy current interference of the metal support structure; LCC-S compensation network, including primary compensation inductor L1 and capacitor C1, secondary compensation capacitor C s , the decoupling of the transmitting coil current and self-inductance changes is achieved through resonant matching to maintain constant voltage output.

2. The device according to claim 1, characterized in that: The transmitting coil size of the square flexible coil is 50mm×50mm, the receiving coil size is 45mm×45mm, the transmission distance between the transmitting coil and the receiving coil is 4mm, and when the windshield bellows deforms, the square flexible coil disperses the influence of deformation on a single coil through conformal bending.

3. The device according to claim 2, characterized in that: The transmitting coil has an outer diameter of 50mm and an inner diameter of 20mm, while the receiving coil has an outer diameter of 45mm and an inner diameter of 19mm. They are used to compensate for the difference in curvature between the inner and outer sides of the windshield bellows during conformal bending.

4. The device according to claim 1, characterized in that: The thickness of the flexible rubber soft magnetic sheet in the magnetic shielding structure is 0.5mm-2mm, and its magnetic permeability ranges from 100-500H / m. The magnetic field concentration effect is used to increase the self-inductance and mutual inductance of the coil and reduce the influence of metal environment interference on the coupling parameters.

5. The device according to claim 1, characterized in that: In the LCC-S compensation network, the resonant frequency of the primary compensation inductor L1 and the capacitor C1 satisfies the formula: Secondary side compensation capacitor C s and the receiving coil self-inductance L s The resonance condition is: The compensation component parameters are determined through an iterative design process to achieve constant voltage output at the load end.

6. The device according to any one of claims 1 to 5, characterized in that Suitable for wireless power supply of monitoring systems for high-speed train windshields, subway windshields or intercity train windshields.

7. A wireless power transmission method, based on the device according to any one of claims 1 to 6, characterized in that include: The flexible coil array is attached to both sides of the windshield bellows cloth, and the eddy current interference of the metal support rod is suppressed through the magnetic shielding structure; The LCC-S compensation network is used to decouple the transmitting coil current from the self-inductance change to achieve constant voltage output.

Images