WELDING POWER SUPPLY DEVICE

A welding power supply device is provided with an inverter circuit which converts direct-current power into alternating-current power and outputs the alternating-current power to a welding load, and avoltage superimposing circuit which superimposes a re-firing voltage on the output to the welding lo...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MIZUSHIMA HIKARU, UMEZAWA ICHIRO, TAKAMI CHIKANORI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CLADDING OR PLATING BY SOLDERING OR WELDING CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING ELECTRICITY GENERATION MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	A welding power supply device is provided with an inverter circuit which converts direct-current power into alternating-current power and outputs the alternating-current power to a welding load, and avoltage superimposing circuit which superimposes a re-firing voltage on the output to the welding load when the polarity of the output current from the inverter circuit is switched. The voltage superimposing circuit is provided with: a re-firing capacitor which is charged with the re-firing voltage; a charge circuit for charging the re-firing capacitor with the re-firing voltage; and a dischargecircuit for discharging the re-firing voltage with which the re-firing capacitor has been charged. The charge circuit is provided with a direct-current power supply which outputs a direct-current voltage, and a boost means for boosting the direct-current voltage from the direct-current power supply. The charge circuit charges the re-firing capacitor in a first state in which the direct-current voltage from the direct-curre