A Novel Underwater Wireless Power Transfer System Based on <i>LCC</i>-S Compensation Topology With Wide Soft-Switching Range

Under the influence of high sea conditions and dynamic marine environments, the compensation parameter values in the system are prone to fluctuations, potentially compromising the soft-switching stability. In addition, a significant proportion of the total loss in the three-phase wireless power transfer (WPT) system is attributed to the switching loss. To address these challenges, this article proposes a three-phase WPT system featuring a low-loss passive auxiliary network with an inductor-capacitor–capacitor-series (LCC-S) compensation topology. With the support of this passive auxiliary network, the system’s switches can achieve zero-voltage switching (ZVS) turn-on and ZVS turn-off across its wide load range while exhibiting insensitivity to fluctuations in compensation parameters. This article first analyzes the soft-switching communication mechanism of the proposed structure before designing the wide range soft-switching conditions and parameters for the system. Finally, an underwater three-phase WPT experimental prototype with a rated power of 1 kW is developed, and the results demonstrate the superiority of the proposed scheme.