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Uninterruptible power supplies using fuel cells

  • US 6,602,627 B2
  • Filed: 03/20/2001
  • Issued: 08/05/2003
  • Est. Priority Date: 03/20/2000
  • Status: Expired due to Term
First Claim
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1. An uninterruptible power supply system comprising:

  • a source of a utility power signal;

    a source of hydrogen;

    a fuel cell stack for converting the hydrogen into a fuel cell output signal;

    a first input circuit operatively connected to the utility power signal, where the first input circuit outputs a first AC input signal based on the utility power signal;

    a second input circuit operatively connected to the fuel cell output signal, where-the second input circuit generates a second AC input signal based on the fuel cell output signal;

    an output circuit operatively connected to the first and second input circuits, where the output circuit outputs at least one output signal based on one of the first and second AC input signals; and

    a control circuit operatively connected to the fuel cell stack, the first input circuit, the second input circuit, and the output circuit for controlling whether the output signal is generated based on the utility power signal or hydrogen.

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