带无损缓冲的新型三相反激式功率因数校正器的研制

提出了一种新颖的基于反激式变换器的三相功率因数校正器,讨论和分析了该电路的校正原理、关键参数和性能特点,并介绍了两种实用的零电压过渡方案,通过仿真和实验证明了理论分析的正确性.

Design and Development of a Three-Phase Flyback PFC AC/DC Converter With Passive Lossless Snubber

A three-phase fly-back converter (PFC) with an energy recovery circuit is proposed. The technique of three-phase power factor correction in switch mode power supplies is still not perfect. Most of the schemes are based on the combination of three single-phase power factor correction circuits with complex topology and control strategies resulting in high cost and low popularization. In this paper, a novel three-phase single-stage ac-dc converter system is proposed. The principal characteristics are very simple topology, galvanic output, low complexity of control method, low mains current distortion and resistive fundamental behavior. In this converter, ZVS at turnoff can be achieved by two kinds of soft-switching techniques,and ZCS at turnon can be obtained by operating under the DCM. The two energy recovery snubber which can be used don't need not any auxiliary control circuit and can reduce the switching losses. Experiment results confirmed the validity of the circuit, showing sinusoidal and balanced input currents. The proposed converter can be met the IEC standard, and will provide an appropriate power supply scheme for telecommunication equipment such as mobile base stations.