Driving circuit and method for fan
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United States of America Patent
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Nov 11, 2014
Grant Date -
Jan 23, 2014
app pub date -
Oct 29, 2012
filing date -
Jul 17, 2012
priority date (Note) -
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Abstract
A driving circuit for driving a fan with a plurality of operational modes includes an initiation module for generating a switch signal according to a feedback signal, a control module coupled to the initiation module for utilizing a pulse frequency modulation technique to generate a control signal according to the switch signal and a predetermined comparison signal, so as to drive the fan for a rotational operation, and a feedback module coupled to the fan for generating the feedback signal according to a conduction result of the fan. The rotational operation includes the plurality of operational modes, and the fan is switched between the plurality of operational modes according to different conduction results of the fan.
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