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Static transfer switch device and method

DC
  • US 7,459,804 B2
  • Filed: 11/10/2004
  • Issued: 12/02/2008
  • Est. Priority Date: 02/10/2004
  • Status: Active Grant
First Claim
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1. A transfer switch system, comprising:

  • a first switch connectable to a first voltage source;

    a second switch connectable to a second voltage source; and

    a controller connected to the first and second switches to activate and deactivate the first and second switches to selectively connect the first or the second switch to a load via a transformer;

    the controller having inputs for receiving signals representing the voltage levels of the first and second voltage sources and the voltage applied to the load, wherein upon a predetermined condition, the controller temporarily pulses on the second switch and thereafter, turns on the second switch, wherein the controller determines a switching time to minimize downstream saturation current and turns on the second switch at the switching time.

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