| 摘要 |
PROBLEM TO BE SOLVED: To provide a power unit for arc machining capable of reducing dispersion of the output voltage or the like occurring attributable to dispersion of components such as windings and secondary rectification circuits of a plurality of main transformers which are provided in parallel and built in the power unit. SOLUTION: The power unit for arc machining comprises: an inverter circuit composed of six elements; a first main transformer and a first secondary rectification circuit provided between a connection point of the first and second elements and a connection point of the fourth and fifth elements; a second main transformer and a second secondary rectification circuit provided between a connection point of the second and third elements and a connection point of the fifth and sixth elements; a pulse width control circuit which outputs the first and second pulse signals for performing the PWM control of the inverter circuit based on the output voltage or the like, drives the first and sixth elements by the first pulse signal, and drives the third and fourth elements by the second pulse signal; and a phase control circuit which drives the second element by performing the 1/4 period phase shift when the first pulse signal is input, and drives the fifth element by performing the 1/4 period phase shift when the second pulse signal is input. COPYRIGHT: (C)2008,JPO&INPIT
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