EMC and EMF safety issues in wireless charging system for an electric vehicle (EV)

A numerical investigation is carried out to assess the EMC and EMF safety compliance of a wireless power transfer (WPT) system used to recharge the battery of an electric vehicle (EV). The assessment is numerically performed considering a WPT system working at the frequency of 85 kHz with output power of 7.7 kW. The prediction of the electromagnetic field is carried out by using a finite element method (FEM) code to model the WPT coils and the chassis of the car. The calculated magnetic field is compared with the International Commission on Non-Ionizing Radiation Protection (ICNIRP) reference level, demonstrating the compliance of the WPT system. Finally, an investigation of the conduced emission (CE) on the battery side is proposed by using SPICE simulations.