Three-Phase Sinusoidal Rectifier Consisting of Three Thyristors and a Resonant Switch

Abstract

Three-phase sinusoidal rectifier consisting of three thyristors and a resonant switch is presented. The switching transition of resonant switch is mainly governed by a series resonance and this allows the thyristors to turn on and off under the zero-current switching condition. Also, the currents flowing through power devices are always limited to the dc current. The experimental prototype employing three inverter-grade thyristors and two insulated-gate bipolar transistors is implemented to investigate the operation. The results confirm that the sinusoidal input currents with a near-unity power factor can be obtained under the pulse-width modulation.