Method and apparatus for battery charging based on battery capacity and charging source constraints
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United States of America Patent
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Nov 30, 2010
Grant Date -
Jul 23, 2009
app pub date -
Jan 21, 2008
filing date -
Jan 21, 2008
priority date (Note) -
Expired
status (Latency Note)
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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.
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