| 摘要 |
PURPOSE: An electric welding machine using a double alternating current (AC) input power source is provided to prevent damage to the welding machine and to maintain welding quality even though using different AC power sources. CONSTITUTION: An electric welding machine comprises an AC input power source (100), a rectification part (200), a transformer (600), first and second power source conversion switches (301,302) first and second power source smoothing condensers (401,402), and first and second high frequency conversion circuits (501,502). The rectification part rectifies the AC input power source to a direct current (DC) power source. The first and second power source conversion switches supply the rectified DC power source to an input terminal of the transformer. The first and second power source smoothing condensers smooth the ripple voltage of the DC power source. The first and second high frequency conversion circuits generate high frequency output voltage. The transformer converts input voltage at a predetermined transformation ratio and outputs the transformed input voltage to a secondary side. |
