Fan motor speed control circuit, fan apparatus, and electronic apparatus
First Claim
1. A fan motor speed control circuit comprising:
- a driving circuit configured to drive a fan motor so as to run at a rotation speed corresponding to a drive signal;
a comparison circuit configured to output a comparison signal for matching a rotation speed of the fan motor with a target rotation speed, based on a reference signal corresponding to the target rotation speed of the fan motor and a speed signal corresponding to the rotation speed of the fan motor; and
a selection circuit to which the reference signal corresponding to the target rotation speed of the fan motor and the comparison signal output from the comparison circuit are input, the selection circuit configured to select one signal out of the reference signal and the comparison signal and output to the driving circuit the drive signal corresponding to the one signal, the one signal being a signal by which the fan motor is driven at a higher rotation speed.
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Accused Products
Abstract
A fan motor speed control circuit includes: a driving circuit configured to drive a fan motor so as to run at a rotation speed corresponding to a drive signal; a comparison circuit configured to output a comparison signal for matching a rotation speed of the fan motor with a target rotation speed, based on a reference signal corresponding to the target rotation speed of the fan motor and a speed signal corresponding to the rotation speed of the fan motor; and a selection circuit configured to output to the driving circuit the drive signal corresponding to one signal out of the reference signal and the comparison signal, the one signal being a signal by which the fan motor is driven at a higher rotation speed.
24 Citations
5 Claims
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1. A fan motor speed control circuit comprising:
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a driving circuit configured to drive a fan motor so as to run at a rotation speed corresponding to a drive signal; a comparison circuit configured to output a comparison signal for matching a rotation speed of the fan motor with a target rotation speed, based on a reference signal corresponding to the target rotation speed of the fan motor and a speed signal corresponding to the rotation speed of the fan motor; and a selection circuit to which the reference signal corresponding to the target rotation speed of the fan motor and the comparison signal output from the comparison circuit are input, the selection circuit configured to select one signal out of the reference signal and the comparison signal and output to the driving circuit the drive signal corresponding to the one signal, the one signal being a signal by which the fan motor is driven at a higher rotation speed. - View Dependent Claims (2, 3)
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4. A fan apparatus comprising:
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a fan; a fan motor configured to drive the fan; a driving circuit configured to drive the fan motor so as to run at a rotation speed corresponding to a drive signal; a comparison circuit configured to output a comparison signal for matching a rotation speed of the fan motor with a target rotation speed, based on a reference signal corresponding to the target rotation speed of the fan motor and a speed signal corresponding to the rotation speed of the fan motor; and a selection circuit to which the reference signal corresponding to the target rotation speed of the fan motor and the comparison signal output from the comparison circuit are input, the selection circuit configured to select one signal out of the reference signal and the comparison signal and output to the driving circuit the drive signal corresponding to the one signal, the one signal being a signal by which the fan motor is driven at a higher rotation speed.
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5. An electronic apparatus comprising:
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a fan; a part to be cooled by the fan; a fan motor configured to drive the fan; a driving circuit configured to drive the fan motor so as to run at a rotation speed corresponding to a drive signal; a comparison circuit configured to output a comparison signal for matching a rotation speed of the fan motor with a target rotation speed, based on a reference signal corresponding to the target rotation speed of the fan motor and a speed signal corresponding to the rotation speed of the fan motor; and a selection circuit to which the reference signal corresponding to the target rotation speed of the fan motor and the comparison signal output from the comparison circuit are input, the selection circuit configured to select one signal out of the reference signal and the comparison signal and output to the driving circuit the drive signal corresponding to the one signal, the one signal being a signal by which the fan motor is driven at a higher rotation speed.
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Specification