Resettable state-of-charge indicator for rechargeable batteries

Details Resettable state-of-charge indicator for rechargeable batteries Resettable state-of-charge indicator for rechargeable batteries

1995-08-17

1997-06-17

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 429 90, 429 91, 324427, 324428, G08B 2100

Patent

active

056401507

ABSTRACT:
An improved state-of-charge indicator for a battery wherein the counter cuit of the battery state-of-charge indicator includes a means for both resetting and fine-tuning the counter circuit. The current flowing from the monitored battery is passed through a sensing resistor. The voltage across the resistor is amplified and integrated over time and the result of the integration is stored in a capacitor discharged by a switch whenever a threshold voltage is achieved. The cycle is repeated each time coulomb of capacity is removed from the battery. The counter circuit counts the charge/discharge cycles of the capacitor resulting in a count representative of the amount of energy dissipated and therefore indirectly of the amount of energy remaining in the battery system. In this improvement, both a resetting means and a fine-tuning means are included for the counter circuit when the battery is being recharged. The fine tuning means can be preset to reset the counter circuit upon reaching a predetermined voltage signifying that the battery is fully charged. The fine-tuning means may further comprise a zener diode used with a MOSFET mixer.

REFERENCES:
patent: 5321627 (1994-06-01), Reher
patent: 5325041 (1994-06-01), Briggs
patent: 5345163 (1994-09-01), Gibbons et al.
patent: 5357203 (1994-10-01), Landau et al.
patent: 5372898 (1994-12-01), Atwater et al.
patent: 5394089 (1995-02-01), Clegg
patent: 5416402 (1995-05-01), Reher et al.
patent: 5440221 (1995-08-01), Landau et al.

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