WELDING MACHINE POWER SUPPLY APPARATUS AND WELDING MACHINE

摘要

A welding machine power supply apparatus (1) is connected between a DC power supply (2) and each of a welding rod (30) and a base material (40) and comprises an MERS (10) that converts a DC voltage outputted by the DC power supply (2) to an AC voltage; a control part (20) that controls the MERS (10); and a coil (5) used for resonation with an alternating pulse current. The MERS (10) includes at least two reverse-conducting-type semiconductor switches and a capacitor (12) that, during a current interruption, stores a circuit magnetic energy to regenerate the welding rod and the base material. The control part (20) controls the switching frequency of the MERS (10), thereby converting the DC voltage outputted by the DC power supply (2) to the AC voltage.