Electromagnetic Radiation Safety Verification of Electric Vehicle's Wireless Power Transmission based on Magnetic Resonance

Wireless power transmission (WPT) technology based on magnetic resonance utilizes two coils with the same frequency and Q-factor. Because of the advantages of long-distance, higher spatial freedom, and higher efficiency, it becomes an innovative method of wireless energy supply for electric vehicles. However, the electromagnetic radiation safety of the human body must be verified before large-scale application of the technology. In order to verify the safety of the human body in the wireless power transmission system of an electric vehicle, a simulation model of an electric vehicle wireless power transmission system and a three-layer human body model are established in this paper. The specific absorption rate (SAR) of the different parts of passengers is simulated by the method of the finite-difference time-domain (FDTD) with FEM software. The results of simulation show that the maximum electromagnetic radiation dose SAR under the magnetic resonance working state is 2.1693*10
^-13
W/Kg, which is lower than the safety limit of ICNIRP guidelines and the IEEE C95.1 standard, which verifies the large-scale application of electric vehicle wireless power transmission (WPT) technology based on magnetic resonance.