Rotation speed control system and method of CPU (Central Processing Unit) fan

Abstract

The invention provides a rotation speed control system and method of a CPU (Central Processing Unit) fan. The method comprises the steps of: obtaining a system environment temperature by using a temperature sensor, adjusting a fan rotation speed to be a first rotation speed and obtaining a first working temperature of the CPU at the first rotation speed; figuring out a first optimization temperature of the CPU at the first rotation speed; adjusting the fan rotation speed to be a second rotation speed and obtaining a second working temperature of the CPU at the second rotation speed; figuring out a second optimization temperature of the CPU at the second rotation speed; figuring out a temperature difference value according to the first optimization temperature and the second optimization temperature; judging whether the temperature difference value is less than a preset temperature parameter or not; and controlling the rotation speed of the CPU fan within an optimal rotation speed range while the temperature difference value is less than the temperature parameter. By implementing the invention, a heat radiation effect and fan noise of an electronic device system can be balanced to optimize the heat radiation effect of the system and reduce the fan noise.

Description

technical field [0001] The invention relates to a heat dissipation system and method for an electronic device, in particular to a CPU fan speed control system and method. Background technique [0002] In a general computer (such as PC / Server) system, it is often necessary to adjust the fan speed (Duty cycle) to improve the heat dissipation effect due to the change of the ambient temperature. However, often because the fan speed is increased, its heat dissipation effect has not been effectively improved. For example, when the fan speed is 100%, excessive noise is generated instead, thereby exceeding the established noise specification. Although increasing the speed of the fan can improve the CPU temperature, when the duty cycle > 80%, the degree of improvement of the CPU temperature is not linearly related to the speed of the fan, which is not obvious when the speed is 20% to 80%, that is, although the fan The speed is increased, but the cooling effect of the system cann...

AI Technical Summary

Problems solved by technology

However, often because the fan speed is increased, the heat dissipation effect has not been effectively improved.

For example, when the fan speed is 100%, it produces excessive noise, which exceeds the established noise specification

Although increasing the speed of the fan can improve the CPU temperature, when the duty cycle > 80%, the degree of improvement of the CPU temperature is not linearly related to the speed of the fan, which is not obvious when the speed is 20% to 80%, that is, although the fan The speed increases, but the cooling effect of the system cannot be achieved, and the fan noise is increased

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