AN AC-DC CONVERTER AND AN INVERTER

摘要

The present invention discloses an AC-DC converter comprising: a three-phase thyristor based converter, a simplified insulated gate bipolar transistor (IGBT) based full-bridge converter, and an inductor connected between them; in the driving mode, the three-phase thyristor based converter works as an AC-DC rectifier, and the simplified IGBT based full-bridge converter works as a boost chopper circuit, and controls the inductor to suppress the current harmonic of the power supply network, so as to increase the power factor; in the regeneration braking mode, the three- phase thyristor based converter feeds the regenerated energy back to the power supply system for energy recovery. The present invention also discloses an inverter. Use of said solution of the present invention can not only increase the power factor, but can also achieve energy recovery at a lower cost.