Transfer switch device and method

  • US 7,352,082 B2
  • Filed: 11/10/2004
  • Issued: 04/01/2008
  • Est. Priority Date: 02/10/2004
  • Status: Active Grant
First Claim
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1. A method of switching first and second voltage sources, comprising:

  • disconnecting the first voltage source from a load;

    computing in substantially real time volt-second areas from waveforms of the first and second voltage sources;

    assigning a polarity to each volt-second area based on the polarity of the corresponding voltage waveform;

    determining a switching time based on when absolute values of the volt-second areas of the first and second voltage sources are approximately equal and the polarities are opposite; and

    connecting the second voltage source to the load at the determined switching time so that downstream saturation current is minimized.

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