Automatic method for controlling rotate speed of fan

A fan speed and fan technology, applied in the field of automatic control that can adjust the CPU fan speed, can solve the problems of power output and noise increase, difficulty in setting in advance, loud fan noise, etc., to reduce power output, save design time, Noise reduction effect

Inactive Publication Date: 2007-02-21
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology

The CPU actual temperature curve 2' is compared with the similar curve 2" stipulated in the CPU thermal energy data specification. When the power is constant, below Tcontrol, the curve 2' is slightly higher than the curve 2"; but after the CPU temperature exceeds Tcontrol, due to the CPU fan Runs at full speed all the time, so curve 2' is much lower than curve 2", causing excess power output and increased noise
[0005] In short, the automatic control method of the fan speed is likely to cause waste of energy and the noise of the fan is relatively large; moreover, to accurately set the fan speed, in addition to referring to the CPU heat and power data specifications, it is also necessary to use a more precise Experimental data and considering the harsh environment test, so it is very difficult to set in advance

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  • Automatic method for controlling rotate speed of fan
  • Automatic method for controlling rotate speed of fan
  • Automatic method for controlling rotate speed of fan

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Embodiment Construction

[0016] see image 3 , Tambient is the temperature value of the CPU when the CPU fan starts running; Tcontrol is the temperature value of the CPU when the speed of the CPU fan needs to be dynamically adjusted; TcaseMAX is the maximum allowable temperature value of the CPU during actual measurement, and these values ​​are determined by the CPU thermal design specification Defined fixed value. This type of value is defined by each CPU manufacturer, and different types of CPUs have different specified temperature values. The minimum output power (Min) of the fan is determined by the minimum voltage when the CPU fan is started, and the maximum output power (Max) of the fan is the power when the CPU fan operates at full speed with its operating voltage. The power-temperature curve of the CPU fan in the present invention is divided into the first part and the second part as shown in the figure by the Tcontrol value on the abscissa and a straight line perpendicular to the abscissa. A...

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Abstract

A method for automatically controlling rotary speed of fan includes setting different power-temperature slope parameter being stored in storage, confirming trigger value of system management interruption program (SMIP) by basic I / O system, deciding whether rotary speed of fan is necessary to be regulated or not according to said trigger value, using SMIP and a counter to commonly confirm temperature difference of central processor and calling up relevant power-temperature slope parameter to set rotary speed of fan then using SMIP to dynamically regulate scratch-pad storage of fan control loop to let SMIP be retriggered if it is necessary.

Description

【Technical field】 [0001] The invention relates to a fan control method, in particular to an automatic control method capable of adjusting the fan speed of a CPU (Central Processing Unit: central processing unit). 【Background technique】 [0002] As the operating frequency of the CPU is getting higher and higher, its power consumption and its own heating temperature are also increasing, resulting in an increasing temperature of the chassis. If the temperature of the chassis is too high, the machine will crash and restart, and in severe cases, the machine will crash and the core will die. Under normal circumstances, when the surface temperature of the CPU reaches 60°C, you must always pay attention to the change of the CPU temperature to avoid the temperature from rising too fast. Therefore, it is very important to monitor and adjust the CPU temperature in time to reduce the temperature of the chassis to a safe standard. In order to better reduce the CPU temperature, the indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/30G06F1/20
CPCH05K7/20209
Inventor 林文祥
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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