Battery charge detector and charging system including such detec

Details Battery charge detector and charging system including such detec Battery charge detector and charging system including such detec

1976-11-03

1979-01-30

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

328132, 320 21, 320 48, H02J 704

Patent

active

041374932

ABSTRACT:
A detector, intended particularly for detecting end of charge of a secondary battery under constant current charge, includes a linear input stage producing an output voltage linearly related to the battery voltage. A relay contact is closed periodically by pulses from a clock to connect the output of the input stage to a capacitor and resistor in series. Any change in the output voltage between closure of the contact cause current to flow in the resistor and a comparator compares the voltage across this resistor with a reference voltage. When the battery is charged and the output voltage starts to fall, the negative voltage on the resistor cause the comparator to latch and provide an output signal.

REFERENCES:
patent: 3805170 (1974-04-01), Dusheck, Jr.
patent: 3886428 (1975-05-01), Macharg
patent: 3938021 (1976-02-01), Kosmin
patent: 3992658 (1976-11-01), Bechtold

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