Speed controller of CPU fan

Abstract

A speed control device for a CPU fan, comprising: a voltage dividing unit and a voltage adjusting unit; wherein: the voltage dividing unit is used to divide a reference voltage so as to output step-by-step divided voltages to the voltage adjusting unit; the voltage The adjustment unit is a voltage dividing circuit composed of a voltage adjusting circuit and a voltage dividing resistor. The voltage dividing circuit divides the power supply voltage, and its voltage dividing point outputs a voltage to the power supply terminal of the CPU fan to control the speed of the CPU fan; the voltage The adjustment circuit is used to receive the voltage signal output by the CPU temperature sensor, and compare it with the step-by-step voltage output by the voltage division unit, and adjust the resistance value of the voltage adjustment circuit according to different comparison results to control the voltage division point of the voltage adjustment unit Output different voltage values. The invention can improve the precision of controlling the speed of the CPU fan according to the CPU temperature, and at the same time reduce the waste of computer resources.

Description

technical field [0001] The invention relates to computer cooling technology, in particular to a device for controlling the rotating speed of a CPU fan according to the temperature of a central processing unit (CPU). Background technique [0002] The most important source of heat in a computer is the CPU. As the CPU processing speed continues to increase, the heat generated by it also increases. At present, the power consumption of the usual CPU is as high as 130W, and its surface temperature can reach more than 100 degrees. Since the increase of heat will affect the stability of the CPU, a fan is generally used to dissipate heat from the CPU at present. Moreover, in order to reduce noise as far as possible, the current fan can adjust the speed according to the temperature of the CPU, so that when the CPU is high temperature, the fan rotates at a high speed, and when the CPU is low temperature, the fan rotates at a low speed, thereby reducing noise. [0003] figure 1 It i...

AI Technical Summary

Problems solved by technology

[0005] 1. The control accuracy is not high

Due to the design differences of SUPER I / O chips from different manufacturers, there may be differences in the accuracy of SUPER I / O when reading the CPU temperature value, and the voltage value output by the CPU to reflect the temperature is first converted into a digital signal, and then converted into a temperature Value, and then converted into a duty cycle signal, using the duty cycle signal to control the voltage of the fan, so the number of signal conversions is large, the error increases, and the control accuracy is further reduced

[0006] 2. The BIOS program support is required during the execution of the control mode. Because different CPUs have different power consumption, the ratio of their temperature to the voltage across the THERMAL diode is also different. Therefore, for different CPUs, the BIOS needs to store different THERMAL diodes. The corresponding relationship between the terminal voltage value and the CPU temperature value; in this way, every time a CPU is replaced, in order to avoid control errors, the data in the BIOS must be modified accordingly, resulting in too many modified BIOSes, resulting in a waste of resources

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