Research on Electric Vehicle Electromagnetic Protection Considering Radiation of Two Wireless Chargers

To evaluate the electromagnetic exposure safety of multiple wireless charging vehicles charging simultaneously and explore simple, effective electromagnetic protection methods, in this paper, car model, wireless charger model, and human body models were established by using COMSOL Multiphysics software. The influence of different relative positions of two wireless chargers on magnetic induction strength (B) in simulation space when two cars are charging simultaneously and the influence of different car body materials on a driver's body surface B and internal induced electric field strength (E) were analyzed. The simulation results showed that the maximum value of B in the car when two wireless chargers work simultaneously was 1.30 times that when a single wireless charger works. The maximum value of simulation space B could be reduced by 24.23% by staggering the front and rear positions of the two wireless chargers. The use of aluminum alloy car body could reduce the maximum value of human body surface B of the driver in the car by 99.76%. The B of the driver's body surface in the aluminum alloy car body combined with the staggering method of two chargers was the smallest, which was 42.86% of that when the two chargers were not staggered, and its electromagnetic exposure level was 1.33% of the International Commission on Non-Ionizing Radiation Protection public exposure limit. The results showed that the protection method is effective.