Vickers, Daniels & Young
Switching type power supply for arc welding
 In a switching type power supply for use in an electric arc welder or plasma cutter, of the type having an output transformer with a primary winding in a series circuit DC source with a selected voltage and a switch, either single or tandem, with a conductive on state to pass a current pulse through the primary winding in a first electrical direction and a non-conductive off state disconnecting the DC voltage source from the winding and a large filter capacitor across the DC input voltage source, the improvement comprising: a snubber network for transferring energy due to the leakage inductance of the primary winding to the filter capacitor when the switch is shifted from the on state to the off state where the snubber network includes a storage capacitor with a diode controlled resonant charging circuit so the winding is in a tank circuit with the storage capacitor to charge the storage capacitor in a charging cycle when the switch shifts from the on state to the off state and a diode controlled discharging circuit where the storage capacitor is in series with the winding and the filter capacitor to discharge the storage capacitor into the filter capacitor when the winding reverses polarity. 
Lincoln Global, Inc.
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inventional additional additional inventional
Lifeng Larry L.
Luo Church