Method for regulating and/or controlling a welding current...

Details Method for regulating and/or controlling a welding current... Method for regulating and/or controlling a welding current...

2005-02-01

2005-02-01

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

By arc

C219S130210

Reexamination Certificate

active

06849828

ABSTRACT:
The invention describes a method of controlling a welding current source (2) having a resonant circuit (27), whereby a bridge circuit (28) is controlled by a control system (4). A consumer, in particular a welding process, is supplied with energy via the bridge circuit (28) from a power source (29). In order to control the individual switching elements (32-35) of the bridge circuit (28), fixed pre-set control states S1to S6are stored and, during normal operation, the bridge circuit (28) is controlled on the basis of the control states S1to S4one after the other. If a change in resistance occurs at the consumer, the control system (4) switches to a special operating mode at the resonance frequency of the resonant circuit (27) and the bridge circuit (28) is controlled on the basis of the stored control states in order to run the special operating mode.

REFERENCES:
patent: 4769754 (1988-09-01), Reynolds et al.
patent: 5712771 (1998-01-01), Fitter et al.
patent: 5783799 (1998-07-01), Geissler
patent: 44 11 227 (1995-10-01), None
patent: 0 602 495 (1994-06-01), None
patent: 10-277739 (1998-10-01), None
patent: WO9701211 (1997-01-01), None
L. Malesani et al.(Oct. 3, 1993) “Electronic Welder with High-Frequency Resonant Inverter”, IAS'93 Conference Record of the IEEE Industry Applications Conference, 28thIAS Annual Meeting, pp. 1073-1080, XP000419573.

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