Extended ZVS Range via LC Resonance in Current-Fed Parallel Resonant Converter for AGV Wireless Power Transfer

This brief presents a novel approach to extend the zero voltage switching (ZVS) range in the current-fed parallel resonant converter for wireless power transfer in an automated guided vehicle (AGV). Unlike previous methods that focus on tuning capacitors or inductors, the proposed method is to resonate the matching capacitor with a lumped inductor to enable ZVS in the region where the ZVS condition is not met, which is an LC resonance approach. The power dissipation due to ZVS failure is analyzed, and the proposed method to guarantee ZVS operation is described in detail. The simulated and measured results verified that the proposed method extends the range of ZVS by approximately 242% and achieves an efficiency improvement of up to 10.69% under the same load conditions compared to the conventional method.