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Apparatus and method for testing battery condition

  • US 20020121901A1
  • Filed: 02/21/2002
  • Published: 09/05/2002
  • Est. Priority Date: 02/26/2001
  • Status: Active Grant
First Claim
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1. In a system in which a load is connected across first and second power terminals of a battery, a circuit for sensing the condition of the battery comprising:

  • a current source generating a first current;

    a resistor;

    a selectively enabled current switch, means connecting the current source in series with the resistor, the selectively enabled current switch, and the battery for selectively passing the first current through the resistor and the battery;

    means for sensing the voltage across the resistor; and

    means for sensing the voltage across the battery for the condition when the selectively enabled switch is open and for the condition when the selectively enabled switch is closed.

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