05504416 is referenced by 36 patents and cites 46 patents.

An adaptive battery charger circuit including a state machine adjusts the charging current in accordance with the battery charge acceptance. The battery charging cycle includes an initial charging phase characterized by a relatively high charge acceptance, an intermediate charging phase characterized by a decreasing charge acceptance and a rising battery temperature, and a final charging phase characterized by the battery being at substantially full charge and the charge acceptance approaching zero. Each charging phase corresponds to one or more states of the state machine. Multiple sets of conditions causing transitions between the states of operation are derived from a model of a battery under charge which relates charge acceptance, battery temperature, and cumulative supplied charge. During the intermediate charging phase, the charging current is adjusted to maintain a predetermined battery temperature for a predetermined duration. With this arrangement, the maximum product of charging current and charge acceptance maintainable for the battery without exceeding a safe temperature is continuously achieved.

Title
Battery charger circuit including battery temperature control
Application Number
8/168268
Publication Number
5504416
Application Date
December 15, 1993
Publication Date
April 2, 1996
Inventor
Robert A Mammano
Costa Mesa
CA, US
Peter R Holloway
Andover
MA, US
Agent
Weingarten Schurgin Gagnebin & Hayes
Assignee
Unitrode Corporation
MA, US
IPC
H02J 7/06
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