Efficiency Analysis in IPT System Based on LCC Compensation Network

The efficiency of inductive power transfer (IPT) system is highly related to the conditions of load and the compensation network. Combined with lithium battery charging characteristic, the transfer efficiency exhibits sharply decreasing in constant voltage (CV) mode in wireless electric vehicle (EV) charging system. This paper compares the light-load efficiency between LCC-Series (LCC-S) and LCC-Parallel (LCC-P) compensation networks under constant voltage (CV) charging mode. An efficiency optimization method is proposed for the LCC-P compensated wireless EV charging system, which is more suitable for the load variation during the constant voltage (CV) charging phase of the lithium battery. After the theoretical analysis is conduced, the MATLAB simulation and experiment were completed to prove the accuracy of the analysis result.