A Triple‐Channel Phase‐Shift Voltage Regulation‐Based Control Strategy for Underwater Wireless Charging Systems

ABSTRACT Based on three‐channel phase‐shift voltage regulation, this paper proposes a control strategy for underwater wireless charging systems in order to address efficiency degradation and weak misalignment tolerance during wide voltage gain output. The strategy adopts a spatially decoupled three‐channel coupling structure and constructs a distributed half‐bridge topology, where three independent power transmission channels are generated by controlling three transmitting coils via half‐bridge circuits. The strategy is able to switch system operation modes and adjust phase‐shift angles between channels, so that output voltage can be regulated flexibly within a broad range, and zero phase angle (ZPA) operation for voltage and current can be maintained in each power transmission channel to improve power transfer efficiency. As demonstrated by the simulation and experimental results, the control strategy exhibits strong wide voltage gain regulation, misalignment tolerance, and fault tolerance capabilities.