Battery state-of-charge indicator

Details Battery state-of-charge indicator Battery state-of-charge indicator

1979-04-13

1980-11-18

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

340636, H02J 700, G08B 2100

Patent

active

042348404

ABSTRACT:
A circuit for indicating the charge state of a battery supplying discharge current to its load circuit under actual load operation during which battery discharge current is subject to magnitude variations and interruptions, having means for storing a stored signal whose value is representative of battery state-of-charge, means for rapidly increasing the value of the stored signal to the scaled value of the battery terminal voltage when its scaled value is below that of the battery terminal voltage, first means for decreasing the value of the stored signal at a slow rate preestablished such that the stored signal decreases from a first value representative of a fully charged battery to a second value representative of a discharged battery in a time period approximating the average time required during normal operation of the load circuit for the fully charged battery to become discharged, and second means, operative only during intervals when the battery supplies no discharge current to the load, for decreasing the value of the stored signal at a rate intermediate said slow and fast rates and related to the difference between the scaled values of the battery terminal voltage and the stored signal.

REFERENCES:
patent: 3307101 (1967-02-01), Byles
patent: 3932797 (1976-01-01), York
patent: 3934188 (1976-01-01), York
patent: 3979657 (1976-09-01), Yorksie
patent: 4021718 (1977-05-01), Konrad
patent: 4025916 (1977-05-01), Arnold et al.

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