Battery charging circuit with full-charge cutoff
First Claim
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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, andon-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.
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Abstract
A battery charging circuit which monitors the terminal voltage of the battery being charged and when the terminal voltage drops off, which occurs at full charge, the circuit operates to terminate the charging.
28 Citations
1 Claim
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1. A battery charging circuit including overcharge protection for a battery being charged comprising:
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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.
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Specification
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Current AssigneeUnited States Of America As Represented By The Secretary Of The Army (Government of the United States of America)
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Original AssigneeThe United States Of America As Represented By The Secretary Of The Army
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InventorsKosmin, Melvyn S.
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Primary Examiner(s)Miller, J. D.
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Assistant Examiner(s)Hickey, Robert J.
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Application NumberUS05/497,773Time in Patent Office544 DaysField of Search320/39, 320/40, 320/31, 320/20, 320/11, 320/54US Class Current320/148CPC Class CodesG01R 19/16542 for batteries charge condit...H02J 7/007184 in response to battery volt...
