Battery charger

Details Battery charger Battery charger

1997-05-14

1998-12-15

Tso, Edward

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With individual charging of plural batteries or cells

320122, H01M 1046

Patent

active

058501363

ABSTRACT:
A battery charger includes charge control circuits each connected in parallel with an associated one of serially-connected battery cells. Each charge control circuit includes a switching device; a comparator, having a hysteresis characteristic determined by two threshold voltages, e.g., a safe charging voltage and an optimum charging voltage, for comparing the battery voltage with one of the threshold voltages selected according to a changing direction of the battery voltage; a reference voltage source for generating a reference voltage corresponding to either one of the threshold values; and a driving circuit for receiving a comparator output to render the switching device conductive or cutoff. When the battery voltage falls between the threshold voltages, the switching device becomes conductive to cause a constant current to flow from the battery cell to the switching device.

REFERENCES:
patent: 4614905 (1986-09-01), Petersson et al.
patent: 5469042 (1995-11-01), Ruhling
patent: 5523668 (1996-06-01), Feldstein
patent: 5578914 (1996-11-01), Morita
patent: 5617004 (1997-04-01), Kaneko
patent: 5644209 (1997-07-01), Chabbert et al.

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