| 摘要 |
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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