200947191 ^ 九、發明說明： • 【發明所屬之技術領域】 本發明係關於一種風扇轉速控制方法，特別是指一 種用於電腦系統中的風扇轉速控制方法。 【先前技術】 現在電腦系統中新一代微處理器使用DTS (Digital200947191 ^ IX. Description of the invention: • Technical field to which the invention pertains The present invention relates to a fan speed control method, and more particularly to a fan speed control method for use in a computer system. [Prior Art] A new generation of microprocessors in computer systems now use DTS (Digital
Thermal Sensor’數位溫度感測器）來測量微處理器的溫 度。這種新方法使用了一個熱敏二極體和一個類比數位 β 轉換器來構成數位溫度感測器。溫度感測器的工作方式 為：一個微處理器核心上的電路從熱敏二極體上採樣然 後把數位資料輸出到微處理器一個特定的寄存器中，從 而任何程式都可以隨意讀取該資料。這種方式的長處就 是所有工作都在微處理器内部即時完成，和易於被干擾 和衰弱的類比信號相比，數位信號傳輸的時候不會損失 精確性。 ❹ 而目前電腦系統中風扇轉速控制方法如圖i所示， 該圖中橫坐標是中央處理器的溫度，縱坐標是風扇轉 速。圖中的初始值為中央處理器風扇開始運轉時的溫度 值’臨界值’為需要中央處理H風扇全速運轉時的溫度 值’該二個溫度值均由中錢理H熱能設計規範規定。 :始值、低速值和臨界值’、全速值決定了該中央處理 盗風扇的速率—溫度曲線Γ的斜率K1，。該風扇轉速控 制方法的主要原理為：隨著中央處理器溫度升高與下 降，風扇的轉速也隨之作出相應的改變。當中央處理器 6 200947191 喻· 溫度不很高的時候，則控制風扇以較低的輸出功率和低 轉速運轉，以降低該風扇的嗓音並減少電能損耗，只有 在中央處理器溫度達到中央處理器溫度設計規範限定的 臨界值時’風扇才會以最大轉速運轉。但是，由於中 央處理器溫度的臨界值設定較低，造成在較低溫度時風 扇即要全速運轉，對散熱風扇的性能要求高，提高了成 本。 【發明内容】 ❺ 鑒於以上内容，有必要提供一種低嗓音、低成本的 風扇轉速控制方法。 一種風扇轉速控制方法，用於控制電腦中的中央處 理器的散熱風扇的轉速，該方法包括以下步驟： 在基本輸入輸出系統中提尚中央處理器所設定的 溫度臨界值； 超級輸入/輸出晶片根據該提高後的溫度臨界值對 Ο 應修改風扇監控參數和曲線； 數位溫度感測器獲取該中央處理器的溫度值，並將 得到的溫度值存放在該中央處理器的寄存器中； 超級輸入/輸出晶片從該中央處理器的寄存器中讀 取出該中央處理器的溫度，並按照修改後的風扇監控曲 線控制該風扇的轉速。 與習知技術相比，增加該中央處理器溫度的臨界 值，使得在同等溫度條件下，風扇轉速降低，減小系統 噪音，降低設計成本。 7 200947191 【實施方式] 月參閱圖2’為本發明風扇轉速控制方法的較佳實 气的中央處理器溫度與風扇速率關係的二維座標 圖初始值為風扇開始低速運行時中央處理器的溫度 值臨界值為需要風扇全速運轉時的溫度值，這些數值 都疋由中央處理器熱能設計規範所定義的固定值。該類 數值由各中央處理器製造商所定義，不同型號的中央處 理器有不同的規定溫度值。該中央處理器溫度的初始 值、臨界值和風扇運行速率的低速值、全速值決定了該 中央處理器與風扇的速率-溫度曲線1的斜率K1。該 中央處理器溫度的臨界值比臨界值’大Μ，曲線i的 ，率1小於曲線1，的斜率K1，。這樣，提高中央處理 器溫度的臨界值，使得該溫度-速率曲線的斜率減小， 在同等溫度條件下’降低了風扇轉速，亦即減小 噪音。 、 〇 清同時參閱圖3 ’為本發明風扇轉速控制方法的較 佳實施方式的系統流程圖。步驟100 :首先，提高-基 本輸入輸出系統中所設定的中央處理器溫度的臨界 值’由於中央處理H溫度的臨界值改變’同等溫度條件 下風扇轉速降低’減小了系統噪音。但該臨界值不能 =過中央處理器所允許的最高溫度值。該臨界值可根據 實際需要選取.，用以降低散熱風扇的成本。 ㈣110·-超級輸入/輪出晶片根據該基本輸入輸 系統中所提高的臨界值對應修改風扇監控參數和曲 8 200947191 一 線。 步驟120 :使用一數位溫度感測器獲取該中央處理 器的溫度值，該數位溫度感測器將得到的溫度值存放在 該中央處理器的一寄存器中。 步驟130:該超級輸入/輸出晶片從該中央處理器的 寄存器中讀取出該中央處理器的溫度，並按照修改後的 曲線控制該中央處理器風扇的轉速。 這樣，在該中央處理器溫度達到臨界值，時，風扇 〇 的轉速降低’風扇的輸出功率小於最大輸出功率，相對 蜂音也較低。此時’風扇也不必全迷運轉，可以減少設 計成本。 综上所述’本發_合乎發料利申請條件，疫依 法提出專利申請。惟，以上該僅為本發明之較佳實施 例，舉凡熟悉本案技藝之人士其所爰依本案之創作精神 所作之等效修飾或變化，皆應涵蓋於以下之中請專利範 圍内。 〇 【圖式簡單說明】 圖1係習知技術中風扇轉速控制方法的速率一曲 線圖。 又 圖2係本發明風扇轉速控制方法的 率-溫度曲線與圖i的對比圖。 万式的或 圖3係本發明風扇轉速控制方法的較佳實施方式的流 200947191 【主要元件符號說明】The Thermal Sensor's digital temperature sensor measures the temperature of the microprocessor. This new method uses a thermal diode and an analog-to-digital beta converter to form a digital temperature sensor. The temperature sensor works by: a circuit on the core of the microprocessor samples the thermal diode and outputs the digital data to a specific register of the microprocessor so that any program can read the data at will. . The advantage of this approach is that all work is done instantaneously inside the microprocessor, and digital signals are transmitted without loss of accuracy compared to analog signals that are susceptible to interference and degradation. ❹ At present, the fan speed control method in the computer system is shown in Figure i. In this figure, the abscissa is the temperature of the CPU and the ordinate is the fan speed. The initial value in the figure is the temperature value at the start of operation of the CPU fan. The 'threshold value' is the temperature value required for the central processing H fan to operate at full speed. The two temperature values are specified by the Zhongqian H Thermal Energy Design Specification. The starting value, the low speed value and the critical value', and the full speed value determine the rate K1 of the rate of the central processing thief fan-temperature curve Γ. The main principle of the fan speed control method is that as the temperature of the central processor rises and falls, the fan speed changes accordingly. When the CPU 6 200947191 is not very high, the fan is controlled to operate at a lower output power and lower speed to reduce the noise of the fan and reduce power loss, only when the central processor temperature reaches the central processor. The fan will only operate at maximum speed when the temperature design specification defines a critical value. However, since the threshold setting of the temperature of the central processor is low, the fan is required to operate at full speed at a lower temperature, which requires high performance of the cooling fan and increases the cost. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a low-pitched, low-cost fan speed control method. A fan speed control method for controlling the speed of a cooling fan of a central processing unit in a computer, the method comprising the steps of: providing a temperature threshold set by a central processing unit in a basic input/output system; a super input/output chip According to the increased temperature threshold value, the fan monitoring parameter and curve should be modified; the digital temperature sensor obtains the temperature value of the central processing unit, and stores the obtained temperature value in the register of the central processor; The output chip reads the temperature of the central processor from the register of the central processor and controls the speed of the fan according to the modified fan monitoring curve. Compared with the prior art, the critical value of the central processing unit temperature is increased, so that the fan speed is reduced under the same temperature condition, the system noise is reduced, and the design cost is reduced. 7 200947191 [Embodiment] Referring to FIG. 2' is a two-dimensional coordinate diagram of the relationship between the central processor temperature and the fan speed of the preferred real air of the fan speed control method of the present invention. The initial value is the temperature of the central processing unit when the fan starts to operate at a low speed. The value threshold is the temperature at which the fan is required to operate at full speed. These values are fixed values defined by the central processor thermal design specification. This type of value is defined by each central processor manufacturer, and different types of central processors have different specified temperature values. The initial value of the central processor temperature, the critical value, and the low speed value of the fan operating rate, the full speed value determine the slope K1 of the rate-temperature curve 1 of the central processor and the fan. The critical value of the central processor temperature is greater than the critical value ', the curve i, the rate 1 is less than the slope K1 of the curve 1, . Thus, raising the critical value of the central processor temperature causes the slope of the temperature-rate curve to decrease, reducing the fan speed, i.e., reducing noise, under the same temperature conditions. And FIG. 3 is a system flowchart of a preferred embodiment of the fan speed control method of the present invention. Step 100: First, the critical value of the central processor temperature set in the basic input/output system is increased. 'The threshold value of the central processing H is changed. 'The fan speed is reduced under the same temperature condition' reduces the system noise. However, this threshold cannot be = the maximum temperature allowed by the central processor. The threshold can be selected according to actual needs to reduce the cost of the cooling fan. (4) 110·-Super Input/Turn-out wafer According to the critical value increased in the basic input transmission system, the fan monitoring parameters and the curve are modified. Step 120: Acquire a temperature value of the central processor using a digital temperature sensor, and the digital temperature sensor stores the obtained temperature value in a register of the central processing unit. Step 130: The super input/output chip reads the temperature of the central processing unit from the central processor's register, and controls the speed of the central processing unit fan according to the modified curve. Thus, when the temperature of the central processor reaches a critical value, the speed of the fan 降低 decreases. The output power of the fan is less than the maximum output power, and the relative buzz is also low. At this time, the fan does not have to be fully operational, which can reduce the design cost. In summary, the 'this issue _ is in line with the application conditions for the issue of the application, and the patent is filed according to the law. However, the above is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art to the spirit of the present invention should be included in the following patents. 〇 [Simplified description of the drawings] Fig. 1 is a graph showing the rate of the fan speed control method in the prior art. 2 is a comparison diagram of the rate-temperature curve of the fan speed control method of the present invention and FIG. Or FIG. 3 is a flow of a preferred embodiment of the fan speed control method of the present invention. 200947191 [Explanation of main component symbols]