Simplified Integration of Bidirectional OBC and WPT Charging Systems With Reconfiguring Topology for Electric Vehicles

Abstract

This letter proposes a simplified integration system of bidirectional on-board chargers (OBC) and wireless power transfer (WPT) charging systems for electric vehicles. The proposed system reduces the cost, weight, and volume of the power conversion units by sharing active switch bridges and magnetic coupler coils without mechanical switches. The proposed magnetic coupler design method enables the secondary coil to be shared in both OBC and WPT modes, while the primary coil for OBC can be magnetically decoupled from the transmitter coil in WPT mode. Based on the proposed topology configuration and winding method, the proposed system operates as a dual-active bridge and an inductor-capacitor-capacitor-series (LCC-S) compensated converter in the OBC and WPT modes, respectively. To validate the proposed integrated OBC and WPT charging system, a prototype with a 3.3-kW OBC and WPT system is configured and verified through experiments.