| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply device for an arc apparatus capable of improving a power factor. <P>SOLUTION: The power supply device for an arc apparatus has a three-phase full-wave rectification circuit which rectifies a three-phase AC power supply by connecting a semiconductor switching device to each rectification device in reverse parallel, an AC reactor connected to the three-phase AC power supply and the three-phase full-wave rectification circuit, a smoothing capacitor which smoothes an output voltage of the three-phase full-wave rectification circuit, an inverter circuit which converts an output of the smoothing capacitor to a high frequency AC, and a rectification circuit which rectifies the output of the inverter circuit to supply to a load. The power supply device for the arc apparatus also has a control circuit which switches and controls each semiconductor switching device, and matches phases of an input voltage and an input current of the three-phase AC power supply. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
