Systems and methods providing arc re-ignition for AC arc welding processes

  • US 9,138,823 B2
  • Filed: 11/13/2012
  • Issued: 09/22/2015
  • Est. Priority Date: 11/13/2012
  • Status: Active Grant
First Claim
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1. A welding power source comprising:

  • a power conversion circuit configured to convert an input current to an output current;

    a controller;

    a bridge circuit operatively connected to the power conversion circuit and configured to switch a direction of the output current through a welding output circuit path operatively connected to a welding output of the welding power source at the command of the controller; and

    a superposition circuit, including at least one capacitor and at least one dedicated charging source configured to directly or indirectly charge the at least one capacitor, operatively connected to the bridge circuit and configured to provide a voltage between an electrode and a workpiece of the welding output circuit path sufficient for arc re-ignition during polarity transition of the output current.

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