Method and apparatus for detecting a full-charge condition while

Details Method and apparatus for detecting a full-charge condition while Method and apparatus for detecting a full-charge condition while

1996-04-24

1997-11-25

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 22, 320 23, 320 30, 320 32, H01M 1044, H01M 1046, H01M 1048

Patent

active

056916248

ABSTRACT:
Secondary batteries, also called rechargeable batteries, are subject to damage from overcharging during rapid charging. A fully-charged condition of a battery undergoing recharging, for example a NiCd or NiMH battery, is detected by a signature drop in battery voltage called a negative delta voltage (NDV). Low-cost analog circuits and methods are disclosed for detecting the NDV. Op amp circuits are arranged to charge one capacitor while the battery voltage is rising to determine a peak voltage, and charge another capacitor while the battery voltage is falling below the peak voltage. The second capacitor voltage is compared to a reference voltage to determine when the battery voltage drop exceeds a predetermined NDV, indicating a fully-charged battery. The invention is useful in battery chargers, battery conditioners, and the like.

REFERENCES:
patent: 4855663 (1989-08-01), Matsui et al.
patent: 5180961 (1993-01-01), Tsujino
patent: 5196780 (1993-03-01), Pacholok
patent: 5345162 (1994-09-01), Shiojima

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