Method, circuit, and electronic device for controlling rotation speed of fan

摘要

The disclosure relates to a method, circuit, and electronic device for controlling a rotation speed of a fan. The method provides a multistage function curve associates temperatures with rotation speed values. The multistage function curve comprises a first steady-state function segment with slope of zero, a second steady-state function segment with slope of zero and N function segments positioned between the first and second steady-state function segments. N is a positive integer. The slope of a (i+1)th function segment is greater than that of an ith function segment, and i is a positive integer in the range from 1 to N. The electronic device comprising the circuit may use the temperature of the processor based on the multistage function curve to dynamically control the rotation speed.

主权项

1. A method for dynamically controlling a fan to dissipate heat of a processor and adjusting fan noise, the method comprising:
predefining a multistage function curve which is established based on fan noise values and associates temperatures with rotation speed values; detecting a temperature of the processor; obtaining one of the rotation speed values by looking up the multistage function curve according to the detected temperature of the processor; and adjusting a rotation speed based on the obtained rotation speed value, wherein when the detected temperature of the processor is higher than a first threshold value and lower than a second threshold value, the rotation speed is controlled to rise with a variation rate of 1% per second; wherein the multistage function curve comprises a first steady-state function segment, a second steady-state function segment and N function segments, the N function segments are positioned between the first steady-state function segment and the second steady-state function segment, and N is a positive integer; a slope of the first steady-state function segment and a slope of the second steady-state function segment are both zero; a slope of a (i+1)th function segment is greater than a slope of an ith function segment, and i is a positive integer in a range from 1 to N; the (i+1)th function segment is linked to the ith function segment, and the (i+1)th function segment is closer to the second steady-state function segment than the ith function segment; and the first threshold value corresponds to a first threshold point where the first steady-state function segment joins a first function segment.