Minimizing the eddy current loss in the chassis when charging an electric vehicle wirelessly

The eddy current loss in the steel chassis of an electric vehicle (EV) is an underestimated problem facing the EV oriented wireless charging system (WCS) designers. In this paper, we have proposed three basic optimizing strategies to develop efficient WCSs with less eddy losses. Finite element simulations are conducted to compare and evaluate the effectiveness of these three methods. Moreover, a 3-kW EV oriented wireless charging prototype is developed, with a steel plate imitating the vehicular chassis, full-load wireless charging experiments are performed. Experimental results match well with the simulation. It shows that minimizing the quadratic sum of the transmit-coil current and receive-coil current is more effective to reduce the eddy current loss.