Motor drive device and electronic device using the same
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United States of America Patent
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Dec 7, 2010
Issued Date -
N/A
app pub date -
Jul 11, 2006
filing date -
Jul 12, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A motor drive device includes: chopping signal generation means for generating a chopping signal Sa when drive current of a driver has reached a first threshold value; chopping signal cut-off means for cutting off the chopping signal Sa when the drive current has reached a second threshold value which is greater than the first threshold value; and overcurrent protection means for generating an overcurrent protection signal Se when the drive current has reached a third threshold value which is greater than the first threshold value and its continuation time has reached a predetermined threshold value time. Thus it is possible to simultaneously obtain the constant current chopping function and the overcurrent protection function and to improve its reliability and safety.
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