Design of energy feedback mode wireless charging system for electric vehicles

With the help of bi-directional wireless power transfer technology, electric vehicle (EV) not only can get power from the grid, but also can supply surplus energy to gird or home when power consumption peaks or power outage. A wireless electric vehicle charging system based on the inductively coupled power transfer (ICPT) technology is presented in this paper. The proposed system can realize either charging or energy feedback mode. The equivalent circuit and operating principle are given firstly. Then, a bi-directional power regulator is introduced and the control mode for line-connected inverter and the parameter design are discussed. A simulation system is built in the Simulink, and the feasibility of the system is proved by the simulation results.