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Primary Examiner: Miller, J. D.
Assistant Examiner: Hickey, Robert J.
Attorney: Edelberg; Nathan, Gibson; Robert P., Bowers; Arthur L.

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Title: Battery charging circuit with full-charge cutoff

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Claims: What is claimed is:

1. A battery charging circuit including overcharge protection for a battery being charged comprising:

a constant current source having a pair of output terminals,

a resistive voltage divider connected across the output terminals of the current source,

a series connected diode and capacitor connected across a resistor of the voltage divider with the diode in the forward direction to follow changes in the terminal voltage of a battery connected across the current source and being charged,

a high input impedance amplifier having a pair of input terminals connected across the diode,

a transistor amplifier including a collector resistor, the base of the transistor amplifier being connected to the output of the high input impedance amplifier to operate at saturation when the diode conducts, and to reduce current level abruptly when the diode ceases to conduct, and

on-off control means connected between the collector of the transistor amplifier and the constant current source for turning off the constant current source when the current level in the transistor amplifier is reduced abruptly.
Other info:

Inventors: Kosmin, Melvyn S. (Ocean Township, NJ, US)

Application Number: 497773
Filing Date: 1974-08-15
Publication_date: 1976-02-10
Assignee: The United States of America as represented by the Secretary of the Army (Washington, DC)
Primary Class(es): 320/148
Other Classes:
US Patent Ref:

3289065	Nov, 1966	Dehmelt et al.	320/40.
3794905	Feb, 1974	Long	320/20.

Other Refs: Other References: Jakobi, Wm. W., Alkaline Secondary Cells, Gould National Batteries, Inc. printed from Encyclopedia of Chemical Technology, 2nd Edition, Vol. 3) pp. 204, 207.