Analysis of a novel three-phase soft-switched converter with high power factor

摘要

Three-phase converters with high power factor achieving sinusoidal input current are studied as novel rectified circuits, especially using the discontinuous current mode (DCM). In this circuit, switching losses increase because of the necessity to turn off the switch at the maximum current. Therefore, the soft-switching method using the lossless snubber is proposed. In this method, ZVS at the turn off can be achieved by lossless snubber and ZCS at the turn-on can be obtained by operating under the DCM. In this paper, the theoretical analysis, numerical analysis using PSpice, and results of the experiments of input current are mentioned.