Method and apparatus for measuring the state-of-charge of a battery system

  • US 5,381,096 A
  • Filed: 10/05/1993
  • Issued: 01/10/1995
  • Est. Priority Date: 04/09/1992
  • Status: Expired due to Fees
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First Claim
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1. A system coupled to a battery for measuring the state-of-charge of the battery while a device attached to said battery is operating, comprising:

  • a battery;

    means for measuring the actual terminal voltage of the battery during operation of the device;

    means for simulating at least some of the internal electrical characteristics of the battery, said means for simulating including;

    circuit means for simulating the internal impedance of the battery with respect to time, said circuit means including capacitance means for simulating the internal capacitance of the battery; and

    means responsive to a function of the simulated internal impedance for simulating the terminal voltage of the battery;

    means for equating the simulated terminal voltage to said measured actual terminal voltage of the battery; and

    means for developing a signal representing the state-of-charge of the battery in response to the voltage across said simulated internal capacitance of the battery.

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