Single-Stage Isolated Bridgeless PFC Converter Achieves 98% Efficiency

摘要

A Single-stage Isolated Bridgeless PFC Converter (patents pending) has a single isolation transformer, three switches, and 98% efficiency compared to four magnetic pieces, 14 switches, and 89% efficiency of the conventional Three-stage approach. It achieves best in-class PFC performance with 0.999 power factor and 1.7% total harmonic distortion. Another Isolated Bridgeless PFC converter (patents pending) with pulsating input current and based on a novel Hybrid-switching method eliminates the front-end full-bridge rectifier, yet provides isolation in a Single-stage power processing, resulting in performance, size, and cost advantages over conventional Three- stage, bridge-type PFC converters.