Analysis and design of current-fed (L)(C) (LC) converter for inductive wireless power transfer (IWPT)

This paper deals with a wireless power transfer topology for electric vehicle (EV) charging application. The main contribution is current-fed technology for inductive power transfer. Detail design of DC-DC wireless power transfer stage is discussed where the inversion stage is current fed topology. DC-link inductor before the inversion stage limits the short circuit current during inverter fault. Stiff current in the input limits the inverter switch current stress. The required resonance in both the transmitter and receiver coil are parallel and series type respectively. The required high transmitter coil current for air core transformer/ coupled inductor is compensated by the parallel resonating capacitor. Resonant converter provides soft switching at device turn off which reduces switching loss. The converter is analyzed and simulated using PowerSIM software. A 300W lab-prototype is development and the hardware results are included to validate the analysis and simulation results.