A new inductive wireless power transfer topology using current-fed half bridge CLC transmitter LC receiver configuration

A new current-fed topology for wireless inductive power transfer (IPT) application using half-bridge circuit is proposed and analyzed. Conventional IPT circuits employ parallel L-C resonant tank/compensation network to transfer power effectively through air-gap. However, in medium power application, this topology suffers from a major drawback that the voltage stress across the inverter switches are considerably high due to high reactive power consumed by the loosely coupled coil. In the proposed topology, his is mitigated by adding a properly designed capacitor in series with the coils. During grid-to-vehicle (G2V) operation, the power flow is controlled through variable switching frequency modulation to achieve extended ZVS of the inverter switches. For G2V operation, the converter circuit is analyzed and simulated using PSIM 9.3. Analytical and simulation results are verified through experimental results obtained by testing a 1.2AW lab-prototype.