WELDING CURRENT SUPPLY Russian patent published in 1999 - IPC

FIELD: electrical engineering; consumable-electrode mechanized arc welders. SUBSTANCE: power transformer windings are connected through double-ended controlled power switches using delta circuit arrangement to phases A, B, C of three-phase supply mains; welding rectifier is connected into center-tap transformer circuit and has secondary winding, two power diodes, and reactor. Switches are controlled by means of electric isolators in the form of optocoupler thyristors. Voltage across transformer windings is monitored by means of circuits incorporating rectifier, optocoupler thyristor, transistors, and resistors. Power switch control circuits are built around 3AND-NOT gates whose outputs are coupled through amplifiers with electric isolators. EFFECT: reduced size, mass, and material input. 3 cl, 3 dwg