Patent ID: 9621064
Date: 2017-04-11
CPC Classifications: H02M

Claim:
1. A DC voltage power supply comprising, a voltage step-down chopper constituting a DC source, an inverter having a bridge circuit including four switching elements; a first switching element to a fourth switching element, being configured to convert DC output from the voltage step-down chopper in single-phase AC power by operating the switching elements, a rectifier configured to perform AC-DC conversion of an output from the inverter, and to supply a direct current thus obtained to a load, and a controller configured to control the voltage step-down chopper and the inverter, and the voltage-type DC power supply further comprising, a short-circuit section between the voltage step-down chopper and the inverter, configured to establish a solidly connected short-circuit between a positive terminal and a negative terminal of the voltage step-down chopper, wherein, when the arc discharge occurs, the controller turns off the first to the fourth switching elements in the inverter, turns off the switching element (Q when the arc is extinguished, or after a lapse of a preset time from occurrence of the arc discharge, the controller turns on the first to the fourth switching elements in the inverter, turns on the switching element (Q