CIRCUITS FOR IMPROVED WELDING PERFORMANCE

摘要

Welding circuits including superposition elements that charge and discharge to assist with re-establishing a welding arc between an electrode and a workpiece after the arc is extinguished when a welding output current polarity changes are described.

主权项

1. A system, comprising:
a welding power conversion circuit configured to convert an input current to an output current; a plurality of switches and corresponding current paths including at least:
a positive polarity main switch on a positive polarity current main path, the positive polarity current main path includes a welding path from an electrode to a workpiece,a positive polarity auxiliary switch on a positive polarity current auxiliary path and a polarity transition auxiliary path,a negative polarity main switch on a negative polarity current main path, the negative polarity current main path includes the welding path from the workpiece to the electrode,a negative polarity auxiliary switch on a negative polarity current auxiliary path and the polarity transition auxiliary path, andan independent discharge control switch on an independent discharge control current path; a controller configured to switch at least one of the plurality of switches; and a superposition element configured to discharge stored energy in response to a polarity change in the output current, the superposition element configured to charge at least when current flows through the polarity transition auxiliary path.