Magnetic Coupling Integration Method in Hybrid IPT Charger Featuring Constant Output Power and Soft Switching in Wide Misalignment Range

To improve misalignment tolerance in Inductive Power Transfer (IPT) systems for EV charging applications, this paper proposes a DDQDD magnetic coupler integrated with an LCC-S hybrid compensation topology and an additional coupling between the primary and secondary compensation inductors. This design enhances output power stability under positional mismatch while eliminating the need for separate compensation coils on the PCB, contributing to a more compact and efficient converter structure. A mathematical model is developed to analyze the effects of x- and y-axis misalignments on mutual inductance and system performance. A 0.7-kW prototype is constructed to validate the theoretical model and demonstrate the system's robustness. Experimental results show that while the additional coupling slightly reduces peak power under ideal alignment, it significantly reduces output power fluctuation under misalignment—from 70% to 5.4% in the y-direction—while maintaining Zero Voltage Switching (ZVS). These findings confirm the proposed approach’s effectiveness for high-efficiency wireless power transfer with enhanced spatial tolerance.