Study of Integrated Pickup Compensation Inductance for EV Wireless Charging System with Double-sided LCC Topology

To make the pickup coil and its compensation network more compact and efficient, an integration method is proposed to make the traditional bulky compensation inductance integrated into the center of the pickup coil in a form of planar coil. The mutual inductances among the primary coil, the pickup coil and the integrated compensation coil are investigated with finite element analysis method. Then the equivalent circuit is analyzed and the power transfer characteristics of the system are further investigated. It has been shown that the influence of the integrated coil can be ignored and the system keeps the constant current characteristics of the primary coil current and the equivalent load current. Finally, a 10kW prototype system is built up. The experimental results have verified the validity of the proposed integration method. The system is tested to be able to output 9.3kW with an efficiency of 93%.