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Uninterruptable power supply

  • US 6,624,635 B1
  • Filed: 10/23/1999
  • Issued: 09/23/2003
  • Est. Priority Date: 10/23/1999
  • Status: Expired due to Term
First Claim
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1. An uninterruptable power supply (UPS) producing a DC output coupled to a load having a controller, said power supply comprising:

  • a mains-derived power converter having an AC input connected to a mains voltage, and a converter DC output;

    a battery having a battery voltage;

    a multiplexer having a battery input coupled to said battery voltage, a converter input coupled to said converter DC output, a battery test input, a battery active output, and a multiplexer output which is coupled to said battery input when said battery test input is asserted and said battery input exceeds a first voltage threshold, and said multiplexer output is coupled to said converter input at all other times, said battery active asserted when said multiplexer output is selecting said battery;

    said load coupled to said multiplexer output, said load controller having a battery test output coupled to said multiplexer battery test input, and said load controller having a battery active input coupled to said multiplexer battery active output.

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