Three-Phase Buck Rectifier Using Snubber Energy Recovery Bridge Legs

Abstract

Three-phase buck rectifier using snubber energy recovery bridge legs is studied. The snubber capacitors assembled into the bridge legs are mainly charged and discharged under the resonance and the energy stored in them is transferred to the load circuit. Also, the currents flowing through power semiconductor devices are always limited to the dc current. The experimental prototype employing insulated-gate bipolar transistors is implemented to investigate the operation under the pulse-width modulation. The experimental results confirm that the input current can be waveshaped sinusoidally with a near-unity power factor.