POWER SOURCE OF DIRECT ELECTRIC CURRENT WELDING ARC Russian patent published in 2001 - IPC

FIELD: electric arc welding in production plants and home appliance devices. SUBSTANCE: power source includes mains rectifier 1, bridge type voltage converter having semiconductor switches 2,3,4,5, output transformer 6, output rectifier 12. Capacitor 9 is connected in parallel to output terminal of bridge type rectifier through alternating current switch 10. The last is controlled by means of electric current pickup 8 connected in series with primary winding of output transformer 6. Output terminal of pickup 8 is connected through threshold device 11 with input of switch 10. Capacitor 9 that is connected at high load electric current values, allows to provide resonance switching mode of semiconductor switches 2,3,4,5 in range of large electric currents and to increase by 1.5 times outlet electric current value. EFFECT: enhanced specific characteristics of power source. 2 dwg