Method and apparatus for measuring the voltage and charge of a battery

  • US 5,144,248 A
  • Filed: 05/22/1989
  • Issued: 09/01/1992
  • Est. Priority Date: 05/22/1989
  • Status: Expired due to Term
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First Claim
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1. An apparatus comprisinga. a load;

  • b. a NiCad battery coupled to said load;

    c. a shunt resistor coupled in series between said battery and said loadd. a current conditioner coupled in parallel with said shunt;

    e. a voltage conditioner coupled in parallel with said load wherein said voltage conditioner further comprises means for supplying a reference voltage, means coupled to said NiCad battery and said supplying means for developing a comparison signal representing the difference between said reference voltage to said voltage of said NiCad battery, means coupled to said developing means for integrating said comparison signal, and means coupled to said microprocessor and said integrating means for indicating the time of said integrating;

    f. a microprocessor coupled to said current conditioner and said voltage conditioner for periodically determining current and voltage of said NiCad battery; and

    g. a liquid crystal display coupled to said microprocessor for periodically displaying said current and said voltage of said NiCad battery.

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