Apparatus for displaying the remaining charge of rechargeable ba

Details Apparatus for displaying the remaining charge of rechargeable ba Apparatus for displaying the remaining charge of rechargeable ba

1989-09-13

1991-08-27

Hickey:, R.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 44, 320 48, H02J 704, H01M 1044

Patent

active

050436511

ABSTRACT:
An apparatus having a rechargeable battery and a battery voltage detector which detects the output voltage of the battery to produce a detection signal when the output voltage falls below a predetermined threshold level. A controller stores a battery capacity value and accumulates the discharge of the battery to produce an accumulated capacity value. The controller also calculates a difference between the stored capacity value and the accumulated capacity value. Using the difference, a display displays the remaining charge value of the battery thereon. If the difference exceeds a predetermined value at a time the controller receives the detection signal, the controller changes the stored capacity value to a new capacity value. Alternatively, the controller may change a rate of accumulating the battery discharge.
The apparatus may have a current detector for detecting a current flowing through the battery. The controller may accumulate the battery discharge based on the detected current.

REFERENCES:
patent: 4677363 (1987-06-01), Kopmann
patent: 4775827 (1988-10-01), Ijntema et al.
patent: 4835453 (1989-05-01), Munning Schmidt et al.
patent: 4849681 (1989-07-01), Munning Schmidt et al.

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