G - Physics – 01 – R
Patent
G - Physics
01
R
324/24
G01R 19/12 (2006.01) G01R 31/36 (2006.01)
Patent
CA 1049614
METHOD AND APPARATUS FOR MEASURING THE STATE OF CHARGE OF A BATTERY BY MONITORING REDUCTIONS IN VOLTAGE ABSTRACT OF THE DISCLOSURE A method and apparatus are disclosed for measuring the state of charge of a battery. The apparatus comprises circuitry for sensing reductions in the output terminal voltage of the battery due to varying load conditions and producing a signal in response thereto. In one embodiment the signal com- prises a series of pulses whose number is proportional to the time that the terminal voltage is below the threshold value. In this embodiment, the apparatus further comprises an inte- grator responsive to the number of pulses for registering the number of pulses produced in response to reductions in the terminal voltage. The output of the integrator is indicative of the state of charge of the battery. In an alternative embodiment, the signal from the sensing circuitry is inte- grated directly to develop a representation of the state of charge of the battery. Techniques for synthesizing different signals from the sensing circuitry are also disclosed.
241631
Finger Eugene P.
Sands Eugene A.
LandOfFree
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