Plasma arc ignition using a unipolar pulse

Details Plasma arc ignition using a unipolar pulse Plasma arc ignition using a unipolar pulse

2011-07-19

2011-07-19

Paschall, Mark (Department: 3742)

Electric heating

Metal heating

By arc

C219S121540

Reexamination Certificate

active

07982159

ABSTRACT:
A starting circuit for use with a plasma torch is provided including circuitry for initiating a pilot arc using a unipolar voltage impulse. A transformer is selectively coupled to a DC source so that an impulse is introduced using the same DC source used to maintain an established pilot arc. A method is provided wherein an arc can be initiated while at the same time the DC source is pre-loaded so that surge injection circuitry is not needed to sustain the arc while ramping to the full pilot arc current level.

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