D.C. chopper with inductance control for welding

Details D.C. chopper with inductance control for welding D.C. chopper with inductance control for welding

1997-07-25

1999-01-26

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913051, 219137PS, B23K 909

Patent

active

058641165

ABSTRACT:
A multi-stage down chopper for arc welding by creating current flow between an electrode and a workpiece, the chopper includes a D.C. input source, a first switching stage, with a first switch device and a first choke, this first stage selectively connects the D.C. input source across the electrode and workpiece at a controlled duty cycle and switching rate and a second switching stage, with a second switch device and a second choke, the second stage also selectively connects the D.C. input source across the electrode and workpiece at the aforesaid controlled duty cycle and switching rate, wherein the chopper is improved by the first and second chokes onto a single core and by providing a minimum current override feedback circuit.

REFERENCES:
patent: 5637246 (1997-06-01), Ikegami

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