Smart battery providing programmable remaining capacity and run-

Details Smart battery providing programmable remaining capacity and run- Smart battery providing programmable remaining capacity and run-

1994-12-15

1997-02-04

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 30, 340636, H02J 704

Patent

active

056002300

ABSTRACT:
A smart battery having programmable remaining capacity and run-time alarm values based on battery-specific characteristics. A memory stores battery-specific characteristics, such as charge characteristics, discharge characteristics, capacity characteristics, and self-discharge characteristics. One circuit measures the environmental conditions of the battery, such as temperature. Another circuit measures the current (charge or discharge) of the battery. A microcontroller periodically determines an incremental self-discharge of the battery based on the measured environmental conditions and the self-discharge characteristic of the battery. The microcontroller increases or decreases a remaining capacity value, representing the remaining capacity of the battery, according to the amount of the incremental self-discharge and the battery current. The microcontroller sends a capacity alarm signal if the remaining capacity value is less than a programmable capacity alarm value. The microcontroller also increases or decreases a remaining run-time value, representing the remaining run-time of the battery, according to the remaining battery capacity and the present charge/discharge rate of the battery. The microcontroller sends a run-time alarm signal if the remaining run-time value is less than a programmable run-time alarm value.

REFERENCES:
patent: 4236084 (1980-11-01), Gingras
patent: 4709202 (1987-11-01), Koenck et al.
patent: 5315228 (1994-05-01), Hess et al.
patent: 5459671 (1995-10-01), Duley

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