A Dual-Sided LCLC Topology for AGV Wireless Charging System With Low Leakage EMF

The leakage electromagnetic field (EMF) generated during the wireless charging for automatic guidance vehicle will affect the regular operation of communication equipment and human safety. To reduce the leakage EMF, a dual-sided LCLC topology is introduced and optimized. The core idea is to construct the currents opposite to that flowing through the power transmission coils on primary and secondary sides, respectively. On this basis, connecting the shielding coils in the reverse current branches can generate the canceling magnetic field opposite to the leakage EMF. Thus, a low leakage magnetic coupler is established via the combination of power transmission coils and shielding coils. To minimize the leakage EMF, the specific parameters of magnetic coupler and dual-sided LCLC topology are optimized, and an experimental prototype is built to verify the shielding effect. The results show that when the output power is 1 kW, the shielding effect reaches 84.70%, and the power transfer efficiency is improved by 0.907%. Moreover, in the case of coil misalignment, there is still over 53.15% shielding effect by using the proposed method.