Evaluation of Electromagnetic Exposure During 85 kHz Wireless Power Transfer for Electric Vehicles

Abstract

The external fields in the proximity of electric vehicle (EV) wireless power transfer (WPT) systems requiring high power may exceed the limits of international safety guidelines. This paper presents dosimetric results of an 85 kHz WPT system for EVs. A WPT system for charging EVs is designed and dosimetry for the system is evaluated for various exposure scenarios: a human body in front of the WPT system without shielding, with shielding, with alignment and misalignment between transmitter and receiver, and with a metal plate on the system for vehicle mimic floor pan. The minimum accessible distances in compliance are investigated for various transmitting powers. The maximum allowable transmitting power is also investigated with the limits of international safety guidelines and the dosimetric results.