A Compact Dual-Channel WPT System Based on Decoupled Integrated Coils for Power Enhancement

The multi-coils configuration presents an effective approach for high-power wireless power transfer (WPT) systems. Among them, mitigating complex cross-coupling in magnetic couplers remains critical to achieving high efficiency and stable power delivery. Thus, this brief proposes a compact dual-channel WPT system with decoupled coils to enhance the overall power capacity. The transmitter and receiver have the same structure, with each charging pad constructed by solenoid coils wound around Q-coils and ferrite cores. Solenoid coils and Q-coils are naturally decoupled from each other, thereby eliminating additional coupling interference and only their main mutual inductance $M_{1}$ , $M_{2}$ are retained. Furthermore, the principle of power enhancement and constant current (CC) output is thoroughly analyzed, and a more generalized output model is derived. Finally, a 305 W experimental prototype was constructed, with results in agreement with theoretical analyses. Compared with the single-channel system, the output current (2.82 A) of the proposed system is amplified by (1+ $M_{1}$ / ${M} _{2}$ ), with the peak efficiency reaching 90.5%, an improvement of about 6%.