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Arc welding power supply

  • US 5,991,169 A
  • Filed: 03/16/1998
  • Issued: 11/23/1999
  • Est. Priority Date: 03/16/1998
  • Status: Expired due to Term
First Claim
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1. A dual stage power supply for creating a D.C. welding current through an arc welding gap, said power supply comprising an input inverter stage with a transformer having a first polarity secondary winding, a second opposite polarity secondary winding and a primary winding means for creating current pulses in said secondary windings, a full wave rectified A.C. voltage source, a first switch having a transfer state for passing current through said primary winding means to create a first polarity current pulse in said first secondary winding, a second switch having a transfer state for passing current through said primary winding means to create a second polarity current pulse in said second secondary winding, a rectifier means connected to said secondary windings to rectify said current pulses to produce a D.C. output voltage of said inverter stage across a capacitor;

  • and, an output chopper stage connected across said capacitor and including output leads connected across said arc welding gap, a third switch for gating said output current of said inverter stage at a controlled rate through said leads and through said arc welding gap, an output inductor in one of said leads between said third switch and said arc welding gap and a free wheeling diode across said leads between said third switch and said output inductor.

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