Universal inexpensive battery state-of-charge indicator

Details Universal inexpensive battery state-of-charge indicator Universal inexpensive battery state-of-charge indicator

1994-02-17

1994-12-13

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

With measuring, testing, or indicating means

429 91, 320 48, H01M 1048

Patent

active

053728980

ABSTRACT:
A discharge level monitor for a battery. The current flowing from the monred 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. The capacitor is discharged by a switch controlled by a logic circuit, whenever a threshold voltage is achieved. The cycle is repeated each time one coulomb capacity is removed from the battery. A counting circuit counts the number of charge/discharge cycles of the capacitor to produce a count which is representative of the amount of energy dissipated and therefore indirectly of the amount of energy remaining in the battery system.

REFERENCES:
patent: 4727006 (1988-02-01), Malinowski et al.
patent: 5206097 (1993-04-01), Burns et al.
patent: 5216371 (1993-06-01), Nagai
patent: 5256500 (1993-10-01), Ishimoto

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