Method and apparatus for battery charging based on battery...

Details Method and apparatus for battery charging based on battery... Method and apparatus for battery charging based on battery...

2008-01-21

2010-11-30

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Plural charging sources

C320S128000, C307S043000, C307S056000, C307S072000

Reexamination Certificate

active

07843171

ABSTRACT:
A battery charging circuit sets charging current according to either the capacity of the battery under charge or a constraint of the charging source, depending on the properties of the charging source. The battery charging circuit sets termination current, however, according to the capacity of the battery under charge, regardless of the properties of the charging source. For example, the termination current may be set as a fixed fraction of the recommended C rate of the battery even if the charging current supplied by the charging source is below this C rate. Always setting the termination current in proportion to the battery's capacity permits detection of the current at which charging should terminate even when the charging current is constrained by the charging source and no longer depends on the battery's capacity.

REFERENCES:
patent: 6836095 (2004-12-01), Fogg
patent: 7069347 (2006-06-01), Kolokowsky
patent: 7495416 (2009-02-01), Sato et al.
patent: 7528574 (2009-05-01), Adkins et al.
patent: 7528582 (2009-05-01), Ferguson
patent: 2004/0164708 (2004-08-01), Veselic et al.
patent: 2008/0303352 (2008-12-01), Hsieh et al.
Author Unknown. “USB Power Controller and Li-Ion Linear Charger.” Linear Technology, LTC4055 Data Sheet, publication date unknown.

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