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Apparatus for monitoring battery residual capacity in mulitple modes

  • US 5,672,973 A
  • Filed: 04/05/1996
  • Issued: 09/30/1997
  • Est. Priority Date: 04/07/1995
  • Status: Expired due to Fees
First Claim
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1. An apparatus for monitoring residual capacity of a battery, comprising:

  • means for sensing a discharge current, which is supplied from a battery to a load side;

    means for sensing a terminal voltage of the battery;

    means for calculating residual capacity of the battery based on(1) the terminal voltage of the battery whenever the battery has not experienced a discharge for a time period longer than a time-out period, and(2) an approximately linear function of the terminal voltage and the discharge current whenever the battery is experiencing a discharge;

    a display section for displaying the residual capacity calculated by said calculating means; and

    a time-out circuit connected to the means for calculating for causing the last-calculated residual capacity to be retained for the time-out period after a discharge from the battery ceases.

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