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Method and apparatus for welding

  • US 6,777,649 B2
  • Filed: 05/21/2002
  • Issued: 08/17/2004
  • Est. Priority Date: 05/21/2002
  • Status: Active Grant
First Claim
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1. A welding-type power supply for providing welding-type power to a load, comprising:

  • a transformer, having a primary winding, an output secondary winding, and a charging secondary winding;

    a rectifier circuit, having an ac side connected to the output secondary and further having a dc side;

    a battery connected in series with the dc side to add to the output voltage, wherein the series combination is disposed to be connected to the load;

    a charging rectifier and a switch, having a control input, disposed to selectively connect the charging rectifier to at least one of the battery and the charging secondary winding; and

    a controller responsive to a trigger signal from a welding torch, and having a control output connected to the control input

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