| 摘要 |
PURPOSE:To obtain a titled welding machine that enables generation of ignition pulse of stable action using simple circuit, by producing ignition pulse for three- phase half-wave circuit from ignition pulse of a three-phase half-wave circuit which is double star connected. CONSTITUTION:Secondary side of a main transformer 14 to which a three-phase AC power source is inputted is constituted of the first and second output windings 141a, 141b which are double star connected. The first and second three- phase half-wave control rectifier circuits 14a, 14b are constituted of said windings and main thyristors 142a, 143a, 144a, 142b, 143b, 144b as control rectifier elements. Neutral points of above-mentioned main winding are connected by an interphase reactor 5. An ignition pulse generation circuit 11 operated by a controlling transformer 10 in the main transformer 14 controls the first three-phase half-wave circuit 14a and generates ignition pulse of prescribed pulse. At the same time, it outputs to an intermediate pulse generation circuit 12, and generates pulse of intermediate phase by the second three-phase half-wave circuit 14b and outputs to output terminals 7, 8. |
