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A novel soft-switching Three-Level (TL) DC-DC converter with phase-shift PWM scheme is presented in this paper. This converter performs Zero Voltage and Zero Current Soft-Switching commutation (ZVZCS) with assist of the tapped inductor output filter in the secondary-side rectifier of the High-Frequency (HF) transformer. By employing the tapped-inductor, the circulating current which increases in the HF transformer in accordance with expansion of the phase-shift angle is drastically reduced, which ensures that the high conversion efficiency can be achieved for the wide range of load variation, compared to its counterpart of ZVS TL DC-DC converter. The operation characteristics and soft-swicching operations in principle are verified by simulation results.

A Novel Phase-Shifted PWM Zero-Vblatge Zero-Current Switching Three-Level DC-DC Converter with Circulating Current Reduction Scheme