A High-Power Multi-Rectifier WPT System with A Hybrid Modulation for Wide-Range ZVS Operation

Wireless power transfer (WPT) systems for electric vehicles (EVs) may require primary-side or dual-side control to meet a variety of power regulations. However, this architecture requires frequent WiFi communications between the ground assembly (GA) and the vehicle assembly (VA) while achieving wide-range power regulation, which may have a significant time delay. To address these issues, a new DC-link parallel AC-link series multi-rectifier (DPAS-MR) architecture is proposed for the WPT system in this paper. The proposed topology and hybrid modulation method are presented in detail. In addition, zero voltage switching (ZVS) operation, power loss, hybrid power device architecture, and design procedure are analyzed. A wide range of output power regulation can be realized by only using secondary-side control without dual-side communication. An 8-kW DPAS-MR WPT prototype with three rectifiers is built and the output power ranges from 3 kW to 8 kW with a maximum overall efficiency of 93.5%, which verifies the effectiveness of the proposed system.