关键词: 功率因数校正, 反激式, 缓冲电路, 整流

Abstract:

A new three-phase flyback rectifier with loss recovery snubber is presented. A discontinuous current mode (DCM) operation with constant duty ratio allows achieving unity power factor. The principal characteristics are the very simple topology with only one switch, simple control scheme without input current feedback, and galvanic isolation between the input and output. By using a resonant energy recovery snubber, the switch can achieve zero voltage state (ZVS) at the turn off, and can also be protected against over-voltage caused by the leakage of transformers. Meanwhile, the switching loss is evidently reduced and the efficiency is greatly improved. There is not additional control circuit in the snubber. Simulation and experiment results confirm the validity of circuit, showing sinusoidal input currents and a ripple-less output voltage. The topology can be used as wireless base station power supply.

Key words: power factor correction, fly-back, snubber, rectifier