Yi Yang, Zhiwei Yao, Wenxuan Pan, Ronghuan Xie, Xiangpeng Cheng, Yiming Zhang
In an electric vehicle (EV) wireless power transfer (WPT) system, a critical challenge is to address mutual inductance variations and output fluctuations caused by the misalignment along the lateral direction of the EV. This letter proposes an anti-misalignment method using two transmitting coils. Firstly, an inductor-capacitor-capacitor series (LCC-S) topology is adopted on the transmitting side. The relationship between the output voltage and the mutual inductance is derived, and a compensation parameter design method is proposed. Secondly, an output voltage compensation method is proposed to enhance the misalignment tolerance performance. Finally, an experimental prototype is built to verify the validity of the theory. The experimental results show that the proposed system can achieve an output performance of 200 V and 1 kW, with a peak efficiency of 95.17% over the misalignment range.