CONTROL OVER ELECTRIC POWER SUPPLY OF WELDING TRANSFORMER FOR SINGLE-PHASE AC WELDING MACHINES Russian patent published in 2014 - IPC B23K11/24 

FIELD: process engineering.

SUBSTANCE: invention relates to welding. Proposed method comprises generation of voltage for welding transformer rated to industrial frequency by cyclic alternate commutation of linear voltages with the help of two three-phase controlled rectifiers with opposite-parallel connection. Note here that every linear voltage of three-phase supply circuit is connected to welding transformer for definite number of supply circuit half-periods. Note also that connection of every next linear voltage is effected before the half-period end of previous linear voltage of the same polarity, these connections being reiterated cyclically. Besides, to rule out magnetic saturation of welding transformer core at every half-period of commutation of two linear voltages the voltage is adjusted so that its integral magnitude per a period equals zero.

EFFECT: supply of contact fusion welding machines from three-phase circuit with uniform loading of three phases of said circuit.

2 cl, 3 dwg