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AC power supply

  • US 4,694,140 A
  • Filed: 11/14/1985
  • Issued: 09/15/1987
  • Est. Priority Date: 11/14/1985
  • Status: Expired due to Term
First Claim
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1. An improved portable AC welding machine comprising:

  • a liquid tight tank with a removable lid thereon;

    a power transformer positioned within said tank, said power transformer comprising, a cylinderical core with an open tubular center, perforated insulation material enclosing said core, a primary electrically winding wound over said perforated insulation material, a wrapping of porous insulation material over said primary winding and a secondary winding wound over said porous insulation material, the ends of said primary and secondary windings extend external of said tank;

    an insulating medium within said tank engulfing said power transformer, said insulating medium is liquid at least when said power transformer is at operating temperature;

    a pair of welding cables extending from said ends of said secondary windings; and

    a power source for connecting to said ends of said primary winding.

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