POWER SOURCE FOR DIRECT CURRENT ELECTRIC ARC WELDING Russian patent published in 1995 - IPC

FIELD: electric arc welding. SUBSTANCE: power source includes three inverting cells, switching pulse generator, a switching pulse transformer, a rectifier, having three pairs of diodes, and a welding circuit. Each inverting cell has two output transformers with primary windings, secondary windings and resetting windings, two main thyristors, transistorized switches and thyristors in a circuit of resetting windings. A control system of the power source has a unit of null-balance devices, a logic gate, three flip-flop of selecting pulses, a frequency multiplier, a frequency division trigger, pulse shapers, two units of single-shot multivibrators, logic gates and three pulse distributors. EFFECT: enlarged using range of power source. 1 cl, 4 dwg