Invention Application
WO2002098191A1 PLASMA-ARC TORCH SYSTEM WITH PILOT RE-ATTACH CIRCUIT AND METHOD
审中-公开
具有引导重新连接电路和方法的等离子弧转换系统
- Patent Title: PLASMA-ARC TORCH SYSTEM WITH PILOT RE-ATTACH CIRCUIT AND METHOD
- Patent Title (中): 具有引导重新连接电路和方法的等离子弧转换系统
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Application No.: PCT/US2002/016809Application Date: 2002-05-29
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Publication No.: WO2002098191A1Publication Date: 2002-12-05
- Inventor: NORRIS, Stephen, W.
- Applicant: THERMAL DYNAMICS CORPORATION , NORRIS, Stephen, W.
- Applicant Address: Industrial Park #2, West Lebanon, NH 03784 US
- Assignee: THERMAL DYNAMICS CORPORATION,NORRIS, Stephen, W.
- Current Assignee: THERMAL DYNAMICS CORPORATION,NORRIS, Stephen, W.
- Current Assignee Address: Industrial Park #2, West Lebanon, NH 03784 US
- Agency: BURRIS, Kelly, K.
- Priority: US09/870,272 20010530
- Main IPC: H05H1/36
- IPC: H05H1/36
Abstract:
A plasm-arc torch system, a circuit, and a method for controlling a pilot arc. A rate of change sensor, such as a dv/dt sensor, monitors the output of an error amplifier 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. The error amplifier preferably provides an error signal for use by a pulse-width modulator for providing a current regulated power supply capability. The power supply preferably regulates the output current to a first level when a pilot arc is present, and to a second mode when a transferred arc is present. The pilot arc may also be re-attached between the tip and the electrode by use of a pilot regulator that attempts to maintain the current flowing through the tip at an intermediate level between the first level and the second level. The pilot regulator is responsive to the total current flowing through the electrode but can only control that portion of the total current that flows through the tip.
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