Charge control circuit for a battery charger

Details Charge control circuit for a battery charger Charge control circuit for a battery charger

1987-02-13

1988-07-05

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 20, 320 36, H02J 704

Patent

active

047557354

ABSTRACT:
A charge control circuit for a battery charger has a sensor circuit for sensing the temperature of a battery being charged and providing an output indicative thereof. A differentiator circuit converts the output of the sensor circuit into an instantaneous time derivative of thereof which is indicative of a corresponding temperature gradient of the battery. When the time derivative is determined by a judging circuit to be below a predetermined threshold indicative of the battery reaching its full charge state, the judging circuit responds to provide a first control signal, causing the battery charger to charge the battery at a high rate. Once the time derivative exceeds the threshold, the judging circuit provides a second control signal, causing the charger to terminate the high rate charge and change to a trickle charge or zero rate charge.

REFERENCES:
patent: 3599071 (1971-08-01), Lapuyade et al.
patent: 3852652 (1974-12-01), Jasinski
patent: 3917990 (1975-11-01), Sherman, Jr.
patent: 4622509 (1986-11-01), Spruijt

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