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System and method for controlling the humidity level of a fuel cell

  • US 6,376,111 B1
  • Filed: 01/25/2000
  • Issued: 04/23/2002
  • Est. Priority Date: 01/25/2000
  • Status: Expired due to Term
First Claim
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1. A system for controlling the humidity level of a fuel cell, comprising:

  • a fuel cell that provides a DC current and a DC voltage;

    a humidifier for humidifying said fuel cell;

    a controller for determining the humidity level of said fuel cell and controlling said humidifier in response to said determined humidity level; and

    a DC/DC converter that imposes an AC ripple current component on said DC current and AC ripple voltage component on said DC voltage, wherein resistance of said fuel cell is calculated by said controller by dividing said AC ripple voltage component by said AC ripple current component.

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