Generator for arc welder with high power factor

Details Generator for arc welder with high power factor Generator for arc welder with high power factor

2004-02-06

2009-08-18

Hoang, Tu B (Department: 3742)

Electric heating

Metal heating

By arc

C219S130100, C219S1370PS, C219S130510

Reexamination Certificate

active

07576299

ABSTRACT:
A generator for arc welder, of the type composed of a rectifier stage followed by a PFC stage and by an inverter stage, both of the high-frequency type, the latter stage supplying power to a final rectifier stage for a welding arc, the PFC stage being composed of two inductors that are mutually magnetically coupled, two diodes with opposite conduction directions, two leveling capacitors and means for controlling the succession of the on and off switchings of the two first switches, so as to shape the current absorbed by the rectifier stage by correlating it to the waveform of the line voltage. The inverter stage comprises four triads of second controlled switches, diodes and capacitors, and there is also a control device for the four second switches and for the current for the final stage that supplies power to the welding arc.

REFERENCES:
patent: 5406051 (1995-04-01), Lai
patent: 6177645 (2001-01-01), Church et al.
patent: 6570128 (2003-05-01), Mela
patent: 2001/0042739 (2001-11-01), Mela
patent: 0 602 495 (1994-06-01), None

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