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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Mar 8, 2011
Grant Date -
Apr 24, 2008
app pub date -
Nov 20, 2007
filing date -
Feb 17, 2006
priority date (Note) -
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Abstract
A method for evaluating the condition of a battery comprises coupling a first power transistor as or as part of a first external load in series with the battery, coupling a second power transistor as or as part of a second external load in series with the battery, and conducting each power transistor to draw a transient large current from the battery while sampling the voltage across the battery and voltage across the load, from which the internal resistance of the battery can be determined. The internal resistance of the battery can then be compared with a predetermined nominal value to issue a warning if the battery is weak. The invention enables, for example, a driver to correctly know the actual condition of an automobile battery in substantially real time while consuming a minimum amount of power.
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