Battery-powered electrical device

Details Battery-powered electrical device Battery-powered electrical device

1997-09-05

1999-03-16

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

320118, 324433, H02J 700

Patent

active

058834982

ABSTRACT:
A battery-powered electrical device with a rechargeable battery pack and a means for preventing excessive discharge of the cells in the battery pack. Each cell is characterized by a voltage-value V.sub.end at which it is desirable to terminate discharge of the cell. The cells are divided into a number of mutually exclusive subsets s.sub.i having N.sub.i cells. The device comprises means for measuring the series voltage V.sub.i across each subset s.sub.i, and interrupting the current to the device if the condition V.sub.i .ltoreq.n.sub.i .times.V.sub.end is met in any of the subsets s.sub.i.

REFERENCES:
patent: 4622508 (1986-11-01), Matteau et al.
patent: 5206578 (1993-04-01), Nor

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