公开(公告)号：US5416297A

公开(公告)日：1995-05-16

申请号：US39898

申请日：1993-03-30

申请人： Lifeng Luo ,  Jeffrey L. Peterson ,  David J. Rhodes

发明人： Lifeng Luo ,  Jeffrey L. Peterson ,  David J. Rhodes

IPC分类号： H05H1/36 ,  B23K10/00

CPC分类号： H05H1/36

摘要： A high frequency, high voltage starting circuit for a plasma arc cutting torch is constructed and operated with isolation between a pilot arc circuit and a transfer arc circuit. The duration and value of the energy flow in the pilot arc after initiating the HFHV signal are controlled electronically. The maximum value is sufficient to initiate and support the pilot arc and its transfer. The duration is sufficiently long to allow the pilot arc to transfer, but sufficiently short that nozzle wear is reduced. In the preferred form both circuits have a common D.C. power supply and independent surge injector circuits each formed by a resistor and surge capacitor connected in parallel with the power supply. An L-C loop in the pilot arc circuit maintains a generally constant current output on discharge.

摘要翻译： 用于等离子体电弧割炬的高频，高压启动电路由导电电弧电路和转移电弧电路之间的隔离构造和操作。 在启动HFHV信号之后的导频弧中的能量流的持续时间和值被电子控制。 最大值足以启动和支持引导电弧及其传输。 持续时间足够长以允许导电弧转移，但足够短，使得喷嘴磨损降低。 在优选形式中，两个电路都具有共同的直流电源和独立的浪涌喷射器电路，每个电涌注入器电路由与电源并联连接的电阻器和浪涌电容器形成。 导通电弧电路中的L-C环路在放电时保持大致恒定的电流输出。