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Device to control power source

  • US 7,238,917 B2
  • Filed: 08/04/2004
  • Issued: 07/03/2007
  • Est. Priority Date: 08/04/2004
  • Status: Active Grant
First Claim
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1. A device to control operation of a power source for an electric arc welder, said power source having a first output terminal connectable to a first welding cable and a second output terminal connectable to a second welding cable, where said cables are to be in a series circuit including a welding gap defined by an electrode and a workpiece, said device comprising:

  • an oscillator driving a first winding for inducing a high frequency voltage into said series circuit, a detector tuned to said high frequency for sensing the level of current in said series circuit at said high frequency and an output circuit to create a start signal when said level exceeds a given value representing a resistance in said gap below a given amount, wherein said first winding is the primary winding of an input transformer and one of said cables is the secondary winding of said input transformer.

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