Method and apparatus for monitoring the condition of a battery by measuring its internal resistance
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United States of America Patent
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N/A
Issued Date -
Aug 23, 2007
app pub date -
Feb 17, 2006
filing date -
Feb 17, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method comprises coupling a first power transistor as a first external load in series with the battery, coupling a second power transistor as a second external load in series with the battery, conducting each power transistor to supply a transient large current to the battery for sampling a group of sampled reference voltages and sampled load voltages in a very transient sampling time for a plurality of times and thus obtaining an internal resistance of the battery. The internal resistance of the battery can then be compared with a predetermined warning value thereof so as to determine whether the former is equal to or larger than the warning value or not, and issuing a warning through an I/O if the determination is affirmative. The invention enables a driver to correctly know the actual condition of the battery in substantially real time while consuming a minimum amount of power.
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