WELDING POWER SUPPLY

PROBLEM TO BE SOLVED: To solve such a problem that the safety standard of discharge cannot be satisfied because the discharge speed of a capacitor built in a noise filter is slow, when power supply from a commercial AC power supply AC is interrupted.SOLUTION: The welding power supply includes a nois...

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Bibliographische Detailangaben
Hauptverfasser:	HATTORI YASUSHI, HOU SONG JIE
Format:	Patent
Sprache:	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:	PROBLEM TO BE SOLVED: To solve such a problem that the safety standard of discharge cannot be satisfied because the discharge speed of a capacitor built in a noise filter is slow, when power supply from a commercial AC power supply AC is interrupted.SOLUTION: The welding power supply includes a noise filter formed of: a common mode choke coil provided in a first line, a second line, and a third line connected with a commercial AC power supply via switches; an across the line capacitor on the input side of the common mode choke coil; first and second resistors; and a line bypass capacitor on the output side. The noise filter is provided with a third resistor connected in parallel with the first resistor via a normal-open first switching contact, and a fourth resistor connected in parallel with the second resistor via a normal-open second switching contact. When power supply from the commercial AC power supply AC is interrupted, the value of discharge resistance is decreased and the discharge speed of a capacitor is increased by closing the first and second switching contacts, so as to satisfy the safety standard.