Zero-Voltage-Switching Resonant SEPIC Converter

摘要

A zero-voltage-switching (ZVS) resonant single-ended primary inductor converter (SEPIC) is presented in this paper. The voltage multiplier technique and active clamp technique are applied to the conventional SEPIC converter to increase the voltage gain, reduce the voltage stresses of the power switches and diode, and obtain ZVS of power switches. Moreover, by utilizing the resonance between the additional inductor and the capacitor in the voltage multiplier circuit, the zero-current-switching (ZCS) operation of the output diode is achieved and its reverse-recovery loss is significantly reduced. The proposed converter achieves high efficiency due to soft-switching characteristics of the power switches and output diode. The operation principle and steady-state analysis of the proposed converter are provided in detail. A prototype of the proposed converter is developed, and its experimental results are presented for validation.