Electromagnetic shielding design for magnetic coupler of N-type dynamic electric vehicle wireless power transfer systems

In order to reduce the electromagnetic radiation of the dynamic wireless power transfer (DWPT) system, this paper proposed an electromagnetic shielding scheme combining active and passive shielding for the N-type magnetic coupling mechanism coupler. Based on the finite element analysis (FEA) software, the magnetic field distribution of the magnetic coupler without and with different shielding structures are analyzed. The passive shielding scheme is rationally configured and optimized, and the electromagnetic radiation above the vehicle is effectively shielded. For the side area of the vehicle which is difficult to shield by passive shielding, an active shielding scheme with a separate coil is further designed. A experiment platform for electric vehicles with with frequency of 20 kHz and output power of 20 kW was built. The two methods of passive shielding and active shielding were experimentally verified. The results show that the magnetic field in the upper and side area of the vehicle meets ICNIRP standard after the proposed method is applied, which proves the feasibility of the passive and active shielding schemes proposed in this paper.