Arc welding power supply
First Claim
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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Accused Products
Abstract
A dual stage power supply for creating a D.C. welding current through an arc welding gap, the power supply comprising an input inverter stage with a full wave rectified A.C. voltage source and an output capacitor; and, an output chopper stage connected across the output capacitor, with the chopper including output leads connected across the arc welding gap, a switch for gating the output current of the inverter stage at a controlled rate through the leads and through the arc welding gap, an output inductor in one of the leads between the switch and the arc welding gap and a free wheeling diode across the leads between the switch and the output inductor.
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Citations
39 Claims
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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.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A dual stage power supply for creating a D.C. welding current through an arc welding gap, said power supply including an A.C. voltage source, a rectifier means for converting said A.C. voltage to a first D.C. voltage at a rectifier output, an inverter stage connected to said rectifier output through an input inductor, said inverter stage having means for converting said D.C. voltage into a second D.C. voltage across a capacitor;
- and, a chopper stage for reducing said second D.C. voltage at said welding gap.
- View Dependent Claims (35, 36)
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37. A method of creating a D.C. welding current through an arc welding gap for an A.C. voltage source, said method comprising the steps of:
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(a) rectifying said A.C. voltage into a first D.C. voltage; (b) passing a current through an inductor as a continuous havorsine D.C. current by said first D.C. voltage; (c) converting said continuous havorsine D.C. current, by an inverter, into a constant D.C. voltage across a capacitor; and
,(d) chopping said second D.C. voltage as it is applied to said welding gap. - View Dependent Claims (38)
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39. 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 full wave rectified A.C. voltage source, and an output capacitor;
- and, an output chopper stage connected across said capacitor and including output leads connected across said arc welding gap, a 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 switch and said arc welding gap and a free wheeling diode across said leads between said switch and said output inductor.
Specification