Minimum Coil Current Stress Design of LCC-LCC Compensated Inductive Power Transfer System Considering Dead Time Effect

The LCC-LCC compensation topology has been widely used in inductive power transfer systems for its good misalignment tolerance and efficiency characteristics. The assumption of constant resonant current in dead time may lead to hard switching or large coil current in existing LCC-LCC design methods. An optimal design method considering dead time effects is proposed to minimize coil current while achieving zero voltage switching. Parametric design principles are derived based on the time-domain models, and then the design method and corresponding procedure are developed. Finally, a 2.5-kW inductive power transfer system prototype is built to verify the feasibility of the proposed optimal design method, and a peak efficiency of 96.5% is achieved.