Research on WPT sunken magnetic shielding system for electric vehicles with multiple parking spaces
In electric vehicle wireless power transfer systems,realizing efficient transmission while reducing mag-netic leakage has been a technical challenge.To address this issue,the paper proposes a sunken shielding coil structure applied to a multi-radio wireless power transfer system,which reduces the magnetic leakage from the target surface without affecting the transmission efficiency of the system.Firstly,a method of calculating the magnetic field of a rectangular coil based on the vector magnetic potential is submitted,by which the magnetic leakage from the target surface of the system is analyzed,providing a theoretical basis for the subsequent magnetic leakage opti-mization;secondly,a method of magnetic leakage optimization is introduced,and each coil parameter meeting the requirements is obtained by applying the method,which provides a key support for the realization of high-efficiency wireless power transfer;lastly,a set of dual-sunken shielded coil structures with magnetic shielding structure is de-veloped based on the coil parameters obtained;and lastly,a set of dual-sunken shielding coil structures with mag-netic shielding structure applied to multiple wireless power transfer systems is developed based on the coil parame-ters obtained,which will not impact the system transmission efficiency.Finally,based on the obtained coil parame-ters,a dual-position electric vehicle wireless charging system with magnetic shielding structure is developed,and the effectiveness of the proposed shielding structure and method is fully confirmed through simulation and experi-ment.The results show that the proposed shielding structure not only reduces the maximum leakage magnetic field in the target area by 25%but also achieves a transmission efficiency of up to 95%when the output power of the sys-tem is constant at 4 kW.
electric vehicleswireless power transfer(WPT)magnetic leakagetransmission efficiency
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