Fan motor speed control circuit, fan apparatus, and electronic apparatus
AssigneesSanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
InventorsTetsuya YOSHITOMI, Takashi HARASHIMA
Life of this patent
Estimating the term…
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.
Claims5
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 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.
A fan apparatus comprising:
- 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 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.
An electronic apparatus comprising:
- 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 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.
Dependencies are inferred from the claim text.