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Fuel cell system automatic power switching method and apparatus

  • US 6,979,504 B2
  • Filed: 07/25/2001
  • Issued: 12/27/2005
  • Est. Priority Date: 07/25/2001
  • Status: Expired due to Term
First Claim
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1. A fuel cell system, comprising:

  • a fuel cell stack;

    a battery; and

    a fuel cell control system, including a power supply switch responsive to a voltage across the fuel cell stack to couple power from the fuel cell stack to the fuel cell control system at a first time while the voltage across the fuel cell stack is above a fuel cell stack threshold voltage and to couple power from the battery to the fuel cell control system at a second time while the voltage across the fuel cell stack is below the fuel cell stack threshold voltage.

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