Soft-Switched Voltage-Doubler Sinusoidal Rectifier with Balanced Output Capacitor Voltages

Abstract

A novel single-phase soft-switched voltage-doubler rectifier is presented. The resonant switch cell for this has a full-bridge DC-DC converter structure built of voltage-bidirectional two-quadrant switch and has a vital function to balance the output capacitor voltages. The switching transitions are mainly governed by a series resonance. The experimental prototype employing four insulated-gate bipolar transistors is implemented to investigate the pulse-width modulated operation. The experimental results confirm that the input current can be waveshaped sinusoidally with a near-unity power factor under the output voltage duplication.