A Promoted Design for Primary Coil in Roadway-Powered System

As technology advances, electric vehicle (EV) dynamic charging utilizing wireless power transfer (WPT) becomes prevalent. This new power supply mode allows running cars to be charged with electricity at any time on the road. Unlike traditional tramcars, the EVs can be free from rail limitation, and WPT technology provides maximal charging flexibility. This paper studies a WPT charging system, which uses a series of sectional primary coils. The relationship between primary coil size and transfer efficiency is fully explored. On the basis of sectional wireless power supply, the lateral movement of transfer coils is reported, and a promoted design for the primary coil that provides power for a two-lane road simultaneously is proposed.