Load Independent Constant Current Wireless Charger Using Hybrid Topology and Integrated Reverse-Coupled Compensators

Inductive Power Transfer (IPT) technology is well-suited for wireless charging of Electric Vehicles (EVs) due to its convenience, inherent safety, and resilience to weather conditions. Maintaining a constant output current across varying coupling coefficients and load resistances is a critical feature of IPT systems. This paper proposes a dual-switch hybrid LCC-S inverter with a novel topology featuring reverse-coupled primary and secondary compensation coils integrated into a new DDQDD (Dual D-Quadrature-Dual D) magnetic coupler. This design eliminates cross-circuit mutual inductance and enhances system stability under mismatched conditions. The proposed two-switch topology replaces the conventional full-bridge inverter, eliminating AC switches in the resonance network and the need for an active rectifier on the receiver side, thereby reducing losses, component count, gate drive circuits, and additional control signals. By relocating inductors from the PCB to the magnetic couplers, the PCB size is significantly reduced, while the obtained tolerant system eliminates the need for complex control methods. A 1 kW prototype operating in Zero Voltage Switching (ZVS) mode has been designed and tested, achieving output current regulation with less than 9% deviation across varying load and coupling conditions, with system efficiency maintained between 88% and 92%.