Method for detecting current transfer in a plasma arc
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United States of America Patent
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-
Jan 30, 2018
Grant Date -
Sep 17, 2009
app pub date -
Mar 12, 2009
filing date -
Mar 14, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and systems for transferring a plasma arc from between an electrode and a tip to between an electrode and a workpiece and back as dictated by the conditions at the cutting arc are provided. The present disclosure allows for arc transfer detection without use of a current sensor at the workpiece or knowledge of a precise pilot circuit limit value through a novel plasma arc control circuit. In one embodiment, the plasma arc control circuit provides a programmable current source and a current sink configured to limit current in a pilot arc control circuit. The pilot arc circuit may be configured to signal its limiting status to a controller, which may switch the pilot arc control circuit in or out of the current path. Certain embodiments may include a pulse width modulation control in the pilot arc control circuit for controlling current flow through the pilot arc circuit.
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