volume | PIER Journals

Abstract

In dynamic wireless charging systems for electric vehicles (EVs), the coupling mechanism is difficult to align, which leads to high output voltage fluctuations and low transmission efficiency of the system. A reverse series double-layer symmetrical coil (RSDSC) structure with magnetic core is proposed. First, the mutual inductance characteristics of this structure are analyzed based on its coupling structure. Secondly, a mutual inductance optimization method is proposed to obtain the optimal values of each parameter of the coil and the optimal values of the magnetic core parameters. Finally, a wireless power transfer system is built based on the obtained coil and magnetic core parameters, and the correctness of the structure is verified through simulation and experimentation. The results show that the maximum mutual inductance fluctuation of the structure of RSDSC with magnetic core is only 4.88%, and the efficiency is up to 97.86% when the receiving coil is offset within 50% (20.8 cm) of the outer length of the transmitting coil.

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Dr. Xiangfei Li

Mr. Xin Zhou

Dr. Shentao Zou

Mr. Yu Cheng

Dr. Xiaohua Shu

Dr. Xinbo Xiong

Dr. Ziyue Gan

Dr. Zhongqi Li