Rogowski Coil Based Self-Driven Synchronous Rectifier for Inductive Power Transfer Systems

Wireless electric vehicle (EV) charging is based on the Inductive Power Transfer (IPT) technology. The use of Wide Bandgap (WBG) devices like Silicon Carbide (SiC) and Gallium Nitride (GaN) as well as adopting Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) have significantly improved the performance of the primary side of typical IPT systems. However, in high power EV charging applications, the secondary side incurs high conduction losses when a diode rectifier is employed. To improve overall efficiency and power transfer capability, this paper proposes a novel and self-driven Synchronous Rectifier (SR) using Rogowski coil fabricated by printed circuit board (PCB) technology, which lowers the secondary side conduction losses. Theory and simulated results are presented to show the suitability of the proposed method, which uses a simple circuit configuration and does not require any information from the primary.