Abstract
When the wireless power transmission (WPT) system of electric vehicle(EV) is working, the leakage of high frequency electromagnetic field (EMF) to the non-working area will be threaten to human safety. According to SAE J2954 standard, the coupling coils modeling of WPT and car shell modeling are established. WPT's bit-directional guidance technology and deviation correction control strategy are given. According to the harm degree of SAR, power density P, current density J and magnetic induction intensity B to human body when the human model is in different positions of standing, lying and sitting, the comprehensive harm index of electromagnetic radiation Σhurt is creatively proposed to assess the electromagnetic radiation hazard of EV. Field circuit co-simulation helps us to study the bio-electromagnetic safety of WPT in vehicle environment. A human exposure EMF joint test system is designed and made to measure vehicle’s surrounding EMF. Through simulation and experimental verification, WPT coil’s electromagnetic exposure level to the human body inside the EV meets the requirements of ICNIRP, the EMF at the ankle outside the EV exceeds the standard and needs to be protected.
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