ABSTRACT To enhance the operational efficiency of bidirectional wireless power transfer (BWPT) systems for autonomous underwater vehicles (AUVs) across wide power ranges, this paper introduces a hybrid BWPT system with a multidegree‐of‐freedom (MDOF) high‐efficiency regulation mechanism. First, by leveraging the complementary relationship between external phase‐shift angles and output power in conventional series–series (S‐S) and double‐side LCC compensated bidirectional WPT systems, a family of hybrid compensation topologies is constructed. Subsequently, an input series output parallel (ISOP) bidirectional WPT system is selected as a representative case for detailed analysis. Taking efficiency optimization as the primary objective, the conditions for achieving wide‐range soft switching in power semiconductors are examined. Furthermore, this paper systematically analyzes three high‐frequency converter modes, full bridge, half bridge, and hybrid bridge, and demonstrates how mode switching can effectively reduce switching losses while adapting to varying parameters and operating conditions. Finally, a 1.2‐kW experimental prototype is developed to validate the proposed models, methodologies, and regulation mechanism under diverse mode combinations. Experimental results confirm that the system maintains transfer efficiency between 91.2% and 93.2% across the entire power range.
Liu et al. (Thu,) studied this question.