Plasma arc torch system with pilot re-attach circuit and method
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United States of America Patent
Stats
-
Sep 21, 2004
Grant Date -
Mar 11, 2004
app pub date -
Sep 5, 2002
filing date -
Sep 5, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A plasma arc torch system, a circuit, and a method for controlling a pilot arc is disclosed. A rate of change sensor, such as a dv/dt sensor, monitors an output current signal or an output voltage signal to determine whether to close a switch to re-attach a pilot arc before a transferred arc becomes extinguished. The switch selectively connects a tip into a circuit path with an electrode and a power supply to allow the pilot arc to form between the tip and the electrode. A power supply preferably regulates the output current or voltage to a first level when a pilot arc is present, and to a second mode when a transferred arc is present.
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