| 摘要 |
PURPOSE:To reduce the size and weight of the titled power source and to reduce the loss by bringing out output terminals for welding from a connecting point of both capacitors of a bridge circuit and a connecting point of both switching elements and taking out outputs of AC and DC selectively by on-off control of both the switching elements. CONSTITUTION:When the switching element 10 and the switching element 11 are turned on and off respectively, a normal direction DC current flows from the positive side output terminal of an output side rectifier circuit 5 to a neutral point via the element 10, a load and a reactor 6. When the element 10 and the element 11 are turned off and on respectively, a reverse DC current flows from the neutral point to the negative side output terminal of the output side rectifier circuit 5 via the reactor 6, the load and the element 11. Moreover, when the elements 10 and 11 are turned on and off alternately, the AC current is supplied to the load via said path. A driving circuit 18 controls on-off of the elements 10 and 11 and an output current value is controlled by comparing a detected current value of a current transformer 15 with a set value of a current setter 17 and controlling the output pulse width of an inverter 3 by a pulse width control circuit 16.
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