Microcontroller methods of improving reliability in DC...

Details Microcontroller methods of improving reliability in DC... Microcontroller methods of improving reliability in DC...

2007-12-04

2007-12-04

Hartman, Jr., Ronald D (Department: 2121)

Data processing: measuring, calibrating, or testing

Calibration or correction system

Temperature

C702S132000, C700S299000, C700S300000, C361S689000, C361S688000, C361S695000, C318S471000, C318S472000, C318S473000

Reexamination Certificate

active

11021385

ABSTRACT:
A method of controlling a motor speed for a fan assembly includes receiving a duty cycle value at a microcontroller. The microcontroller receives a measured fan speed from a speed sensor. An expected fan speed is determined, where the expected fan speed corresponds to the duty cycle value. The measured fan speed is compared with the expected fan speed. A duty cycle of a motor driving signal is reduced if the measured fan speed is less than a predetermined fraction of the expected fan speed.

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