A novel power factor corrected single ended resonant converter with three phase supply

Abstract

A three-phase rectifier stage, enabling a whole class of switched mode and resonant switched mode power converters to automatically draw sinusoidal input currents from a three-phase supply, is introduced. The proposed technique offers advantages including very simple power circuits, simple control and protection, and very-high-quality input currents. The power factor correction method is described, and the analysis, design, and performance obtained from a buck-type single-ended resonant converter with three-phase supply based on this principle are outlined. Results for a 2.5 kW/40 kHz prototype converter, utilizing a single high-speed GTO as the active switching device and operating directly offline from a 415 V three-phase mains supply, are presented to verify theoretical predictions. The measured input current waveforms drawn from the three-phase supply are sinusoidal with approximately unity power factor.<>