Method and apparatus for detecting multiple overcurrent thresholds using a single comparator device
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United States of America Patent
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Jan 29, 2008
Grant Date -
Feb 15, 2007
app pub date -
Aug 8, 2006
filing date -
Aug 10, 2005
priority date (Note) -
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Abstract
A method and an apparatus that permit the detection of multiple overcurrent thresholds, providing system protection particularly but not exclusively in brushless DC motor drive systems, but using only one comparator device instead of multiple comparator devices. The disclosed embodiments predict a higher overcurrent condition based on the time it takes to detect a lower overcurrent condition. Because of the predictive nature of the invention, the higher overcurrent conditions are detected much faster than when using conventional circuitry.
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