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Power supply apparatus for arc-utilizing equipment

  • US 5,751,568 A
  • Filed: 12/03/1996
  • Issued: 05/12/1998
  • Est. Priority Date: 12/03/1996
  • Status: Expired due to Term
First Claim
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1. A power supply apparatus for arc-utilizing equipment, comprising:

  • first converter means for receiving and converting an AC voltage to a DC voltage;

    inverter means for converting said DC voltage from said first converter means to a high-frequency voltage;

    a voltage-transformer having primary and secondary windings, said transformer receiving said high frequency voltage from said inverter means and inducing a voltage-transformed high-frequency voltage in said secondary winding;

    second converter means for converting said voltage-transformed high-frequency voltage from said voltage-transformer to a DC voltage;

    two output terminals between which an output voltage of said second converter means is developed, said two output terminals being adapted for connection to a torch electrode of a torch of said arc-utilizing equipment and a workpiece to be processed by said equipment, respectively;

    high-frequency voltage generating means including a coupling coil having its one end connected to one of said two output terminals;

    a bypass capacitor connected between the other end of said coupling coil and the other one of said two output terminals; and

    control means for controlling said high-frequency voltage generating means and said inverter means;

    said bypass capacitor being connected directly between said other output terminal and said other end of said coupling coil.

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