Fan controller with duty cycle comparator
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United States of America Patent
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May 4, 2010
Grant Date -
Oct 2, 2008
app pub date -
Mar 29, 2007
filing date -
Mar 29, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor controller for a direct current motor includes a first node receiving first PWM signals having a duty cycle indicative of a desired rotational speed of said motor and an input node receiving second digital signals, the frequency of said second signals indicative of the rotational speed of said motor. A frequency-to-PWM circuit is coupled to the input node to provide second PWM signals having a duty cycle corresponding to the rotational speed of the motor. A duty cycle comparator has a first input coupled to the first node and a second input coupled to the second node to generate a control signal for controlling the rotational speed of the motor.
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