Magnetic Field Design for Low EMF and High Efficiency Wireless Power Transfer System in On-Line Electric Vehicles

Abstract

In the mechanism of wireless power transfer in on-line electric vehicle (OLEV), the design of magnetic field is the key technology to determine its electrical performance of power transfer capacity, transfer efficiency, and electromagnetic field (EMF) level. To satisfy all the requirements, systematic approach for optimization of design parameters is required. Even though shielding for reduction of EMF can be applied independently, the shielding effectiveness of the applicable shielding method should be considered in optimization of design parameters. In this paper, we introduce the wireless power transfer mechanism and the EMF reduction techniques, and perform design parameter optimization to maximize transfer power efficiency while satisfying power transfer efficiency and EMF regulation.