Optimisation of active magnetic shielding structure for wireless energy transmission systems based on capacitive shielding
In order to improve the problem of magnetic field leakage in wireless energy transmission systems,this paper proposes a strongly coupled active magnetic shielding structure based on passive capacitive shielding.Firstly,a strongly coupled active magnetic shielding coil structure is designed on the basis of passive capacitive shielding of wireless energy transmission system.Secondly,the operating principle and design method of this coil are given,and the mathematical model as well as the equivalent circuit model are derived.The principles of capacitive shiel-ding and active shielding are explained theoretically,and the shielding effect and transmission efficiency are ana-lyzed as affected by the variation of shielding coil parameters.Finally,a wireless charging system for electric vehi-cles is designed on the basis of the proposed coil structure by combining the obtained coil parameters,and the ef-fectiveness of the proposed coil structure and method is verified through theoretical calculations,simulations and ex-periments.The results show that the coil structure is able to reduce the magnetic leakage of the system by about 40%while maintaining a transmission efficiency of more than 96%,which realizes the goals of reducing the leakage magnetic field and maintaining a high transmission efficiency.
electric vehiclewireless power transferelectromagnetic compatibilityelectromagnetic shielding fieldelectromagnetic field
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