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Device for detecting residual capacity of a battery both in load and no load conditions

  • US 5,122,751 A
  • Filed: 01/15/1991
  • Issued: 06/16/1992
  • Est. Priority Date: 01/16/1990
  • Status: Expired due to Term
First Claim
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1. A device for detecting residual capacity of a battery, comprising:

  • a pair of battery connection terminals connected to a battery which has a discharge characteristic such that an open-circuit voltage thereof without an external load being connected or a closed circuit voltage with the external load connected becomes lower as its discharge becomes deeper;

    comparator means for comparing the open-circuit or closed-circuit voltage of said battery with a plurality of detection voltages set to predetermined voltage values nd for providing an indication of a charge state of said battery; and

    means for compensating for a difference between said open-circuit voltage and said closed-circuit voltage so that said comparator means can compare either the closed-circuit or open-circuit voltages with said plurality of detection voltages such that the indication of battery charge state is substantially unaffected by whether or not the load is connected to the battery.

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