Battery monitor circuit

Communications: electrical – Condition responsive indicating system – Specific condition

Patent

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Details

320 48, 324433, 324434, 328148, 340661, 307362, G08B 2100, H03K 5153

Patent

active

043161855

ABSTRACT:
A battery monitor circuit for rechargeable multicell batteries that provides a reliable indication of battery failure independent of temperature, load and age, by continuously comparing the impedance of the cells of the battery against each other. Comparison means are provided responsive to a first voltage at a tapped terminal of the battery that divides the battery cells into two groups, and to a second voltage that represents a fraction of the battery voltage corresponding to the ratio of the number of cells in each group, said comparison means generating an error signal when said first and second voltages change so as to experience a reversal in relative magnitude, which is indicative of cell deterioration.

REFERENCES:
patent: 3808534 (1974-04-01), Summers et al.
patent: 4134060 (1979-01-01), Feldman

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