A New Active Clamp Zero-Voltage-Transition Cell for Non-Isolated DC-DC Converter with Low Current Stress

Abstract

In this paper, a novel low voltage and current stress zero voltage transition (ZVT) cell is proposed for a family of non-isolated DC-DC converters. By adding a current transfer circuit composed of an auxiliary switch, a diode, two capacitors, and two inductors to the traditional DC-DC converters, the proposed converters achieve zero voltage switching (ZVS) condition for active switches, and alleviates the reverse recovery problem for two diodes. Moreover, with the proper design of the auxiliary circuit, the voltage spikes during the switching process are significantly reduced. And the proposed ZVT cell only introduces low voltage stress but avoiding any additional current stress on the power semiconductor device. The operating principle and performance analysis of the proposed Boost converter are given in detail. The experiment from a 2-kW laboratory prototype at 100 kHz switching frequency has been carried out to validate the theoretical principles. The experimental results show that the proposed Boost converter has the advantage of simple structure and the peak efficiency is found to be 98.76%.