Apparatus and method for determining a charge of a battery

  • US 5,596,260 A
  • Filed: 05/13/1994
  • Issued: 01/21/1997
  • Est. Priority Date: 05/13/1994
  • Status: Expired due to Term
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First Claim
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1. In an electronic device powered by a battery, a method of analyzing a voltage signal to determine a charge of said battery for display on a display device, said method comprising the steps of:

  • determining a discharge curve corresponding to said battery, said discharge curve specifying voltage of said battery as a function of a state of charge of said battery;

    calibrating said discharge curve;

    formulating a battery state model, said model specifying probabilities of an actual charge of said battery for a plurality of possible battery capacities;

    periodically obtaining the voltage signal by measuring a voltage of said battery;

    updating said battery state model according to said voltage signal and said discharge curve by applying Bayes theorem;

    normalizing said battery state model;

    displaying on said display device a representation of said charge of said battery based on a mean value of said battery state model.

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