Research on Shielding and Electromagnetic Exposure Safety of an Electric Vehicle Wireless Charging Coil

作     者：Mou, Wenting Lu, Mai 

作者机构：Institute of Railway Technology Lanzhou Jiaotong University Anning District Lanzhou730070 China Key Laboratory of Opto-Electranic Technology and Intelligent Control Ministry of Education Lanzhou Jiaotong University Anning District Lanzhou730070 China 

出 版 物：《Progress In Electromagnetics Research C》 (Prog. Electromagn. Res. C)

年 卷 期：2021年第117卷

页      面：55-72页

核心收录：

学科分类：080805[工学-电工理论与新技术] 080904[工学-电磁场与微波技术] 0808[工学-电气工程] 080802[工学-电力系统及其自动化] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080204[工学-车辆工程] 0837[工学-安全科学与工程] 0802[工学-机械工程] 0835[工学-软件工程] 0823[工学-交通运输工程] 082301[工学-道路与铁道工程] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：from the National Natural Science Fund ofThe authors acknowledge the financial support from the National Natural Science Fund of China (51567015) and (51867014) 

主　　题：Computer software 

摘      要：To address the problems of large volume, heavy weight, and inconvenient installation of the shield board of a wireless charging coil (WCC) installed on the body of an electric vehicle (EV), a new shielding method is proposed in this paper. From the perspective of engineering practice, according to the principle of passive shielding, and in line with the vertical direction of WCC with ferromagnetic material shielding, this novel shielding method involves only a low permeability metal shielding ring set around the transmitting coil in the horizontal direction. Using the finite element simulation software COMSOL Multiphysics, the EV model, the magnetic coupling resonance (MCR) WCC model, and the pedestrian body model at the observation point are designed. The influence of the metal shielding ring on the self-inductance and mutual inductance of WCC is calculated. The magnetic induction strength (B) and electric field strength (E) of pedestrian body at observation points before and after adding a metal shielding in the horizontal direction are evaluated, and the electromagnetic exposure safety of a pedestrian body in this electromagnetic environment is analyzed. Compared with the shielding method of only adding ferromagnetic material in the vertical direction and after using new shielding, the maximum B of a human trunk is reduced by 43%, the maximum E reduced by 44%, the maximum B of human head reduced by 44%, and the maximum E reduced by 39%. After adding the metal shielding ring, the maximum B and E of human trunk decreased from 8.56 × 10−1 times and 2.28 × 10−1 times of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) exposure limit to 4.89 × 10−1 times and 1.27 × 10−1 times, respectively, and the maximum B and E of human head decreased from 1.62 × 10−3 times and 8.58 × 10−4 times of the ICNIRP exposure limit to 9.18 × 10−4 and 5.25 × 10−4 times, respectively. The simulation results show that the new shielding method can significantly reduce