POWER SUPPLY SOURCE OF WELDING ARC Russian patent published in 1996 - IPC

FIELD: welding. SUBSTANCE: power supply source includes step-down welding transformed with three secondary windings. First leads of three secondary windings are tied up together and connected to leads of power supply source through two valves. Second lead of first secondary winding is linked to lead of power supply source through capacitor and two valves. Second lead of second secondary winding is coupled to lead of power supply source through first winding of choke and two thyristors. Second lead of third secondary winding is connected to lead of power supply source through secondary winding of choke and two valves. Winding of choke are connected in opposition. Winding of transformer alternate. First secondary winding is put between second and third secondary windings. EFFECT: improved operational reliability. 2 cl, 1 dwg