1364159 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直線補償方法，尤其一種 藉由控制晶片提供補償後的脈寬調變訊號控制風扇轉速， 使風扇的轉速曲線經補償後呈直線且線性之方法。 【先前技術】 由於電子元件之咼速度與複雜化，使得電子元件在工 作時會產生可觀之熱能，所以許多電子元件上或是在其工 作之環境中，須設置有一散熱風扇，使得以有效冷卻電子 元件而使其忐正常工作。現今在使用於電腦、繪圖卡或筆 記型電腦時，-賴注之重點在於散熱風扇的轉速控制等 問題。而在控制散熱風扇之運轉方式上，除了全開全關 ⑽/〇FF)之外，主要是用脈寬調變（Pulse Width Modulation，簡稱PWM )來控制風扇運轉，而在每一單位 時間内調紅作職(duty eyele)的差異，據以控制風扇 轉速。 請參閱第卜2圖所示，習知之風扇速度控制，在進行 開迴路(Open Loop)量測轉速控制時，係藉由一控制晶片 (Integrated Circut ’簡稱1〇依接收的一輸入脈寬調變 (Pulse width modulation，以下簡稱贿)訊號轉換為一 輸出:WM訊號’從圖i中剛訊號的工作週期為⑽至祕 並且前述PWM訊號的輸入訊號對應輸出訊號在前述工作週 期範圍内的曲線係呈現直線A1，且為1:1比例使得前述 控制晶片可依據輸出酬訊，控制風扇運轉，並使得風扇 的轉速曲線如圖2卿呈耻拋轉n，前侧2係為風 扇轉速對應至PWM工作週期之曲線呈上拋曲線F1 ;以上所 述習知風扇轉速控制具有以下三項缺點： 1. 風扇轉速對應至PWM工作週期之曲線為上拋曲線，故容 易導致風扇轉速不穩定。 2. 若將開祕的控制曲線〇為風祕速與pwM工作週期 之曲線圖）設計為直線性時，需額外增加電路才能達到， 因此容易造成增加零件的成本。 3. 每-顆風扇馬達的雖*-，故風扇轉速峡格不容易 制定。 是以，要如何解決上述制之問題與缺失，即為本案 之發明人舰事此行#之相瞻商所亟欲研纽善之方向 所在者。 【發明内容】 爰此，為解決上述習知技術之缺點，本發明之主要目 的，係在於一種透過控制晶片提供補償後的脈寬調變訊號 控制風扇轉速，使風扇的轉速曲線經補償後呈直線且線性 的效果。 為達上述目的，本發明提供一種風扇轉速直線補償方 ，、方法包含.經由一控制晶片（Integrate(j circut) 讀取—脈寬調變（Pulse width modulation)訊號進行補償 =算，得到一補償訊號；將前述補償訊號減去或增加一補 償值，可得到補償後的脈寬調變訊號呈下拋曲線；及使前 述控制晶片依據前述補償後的脈寬調變訊號控制一風扇的 1364159 轉速，令風扇的轉速曲線經補償後呈直線且線性。 為便責審查委員能對本發明的目的、技術特徵及其 功效，有更進一步的認識與瞭解，茲特舉若干實施例，並 配合圖示，烊細說明如下： 【實施方式】 本發明之上述目的及其結構與功能上的特性，將依據 所附圖式之較佳實施例予以說明。 請參閱第3、4、5所示，本發明係提供-種風扇轉速 直線補償方法，在本發明之一較佳實施例中，該方法係包 括下列步驟： .(300)開始； (301) 經由一控制晶片（Integrated Circuit，簡稱⑹讀 取一脈寬調變(Pulse Width M〇dulati〇n，簡稱 pwM) 訊號進行補償演算，得到一補償訊號； (302) 將則麵償訊號減去或增加—補償值，可得到補償後 • 的脈寬調變訊號係呈一下拋曲線A2 ; (303) 使則述控制晶片依據前述補償後的脈寬調變訊號控 ' 制一風扇的轉速，令風扇的轉速曲線經補償後係呈 直線且線性。 (304) 結束。 以上所述’本發明之風扇轉速對應至PWM工作週期之線性 (即直線）曲線F2明顯較習知風扇之上拋曲線F1來的平順 且較線性。 復清參閲第4、5、6圖所示，當風扇在進行開迴路(Open 7 13641591364159 IX. Description of the Invention: [Technical Field] The present invention relates to a method for linearly compensating for a fan speed, in particular, a method for controlling a fan speed by providing a compensated pulse width modulation signal by a control chip, so that a fan speed curve is compensated It is followed by a straight line and a linear method. [Prior Art] Due to the speed and complexity of electronic components, electronic components generate considerable thermal energy during operation. Therefore, many electronic components or in their working environment must be provided with a cooling fan for effective cooling. Electronic components make it work properly. Nowadays, when it is used in computers, graphics cards or notebook computers, the focus is on the speed control of the cooling fan. In the operation mode of controlling the cooling fan, in addition to full-opening (10)/〇FF, the pulse width modulation (PWM) is used to control the fan operation, and the adjustment is performed in each unit time. The difference in duty eyele is used to control the fan speed. Referring to Figure 2, the conventional fan speed control is controlled by an open circuit (Open Loop) measurement speed control by means of a control chip (Integrated Circut's referred to as an input pulse width adjustment). The pulse width modulation (hereinafter referred to as bribe) signal is converted into an output: the WM signal 'from the current period of the signal in Figure i is (10) to the secret and the input signal of the aforementioned PWM signal corresponds to the curve of the output signal within the aforementioned working period. The line A1 is presented, and the ratio is 1:1, so that the control chip can control the fan operation according to the output compensation, and the fan speed curve is as shown in Fig. 2, and the front side 2 is the fan speed corresponding to The curve of the PWM duty cycle is the upper throwing curve F1; the above-mentioned conventional fan speed control has the following three shortcomings: 1. The curve of the fan speed corresponding to the PWM duty cycle is the upper throw curve, so it is easy to cause the fan speed to be unstable. If the control curve of the secret is changed to the curve of the wind speed and the pwM duty cycle, when it is designed to be linear, an additional circuit is required to achieve it, so it is easy to increase. The cost of parts. 3. Although the fan motor is *-, the fan speed is not easy to set. Therefore, how to solve the problems and shortcomings of the above-mentioned system, that is, the inventor of this case, the leader of the business, is looking forward to the direction of the new good. SUMMARY OF THE INVENTION Accordingly, in order to solve the above disadvantages of the prior art, the main object of the present invention is to provide a pulse width modulation signal after the compensation of the control wafer to control the fan speed, so that the speed curve of the fan is compensated. Straight and linear effect. In order to achieve the above object, the present invention provides a linear compensation method for a fan speed, and the method includes: compensating by using a control wafer (Integrate (j circut)-pulse width modulation signal] to obtain a compensation The signal is subtracted or increased by a compensation value to obtain a compensated pulse width modulation signal, and the control chip is controlled according to the compensated pulse width modulation signal to control a fan's 1364159 speed. Therefore, the speed curve of the fan is linear and linear after being compensated. For the purpose of reviewing the objectives, technical features and effects of the present invention, the review committee can further understand and understand, and several embodiments are provided with BRIEF DESCRIPTION OF THE DRAWINGS [Embodiment] The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings. See Figures 3, 4, and 5, The invention provides a method for linearly compensating for a fan speed. In a preferred embodiment of the invention, the method comprises the following steps: (300) start; (301) A compensation chip (Integrated Circuit (6) reads a pulse width modulation (Pulse Width M〇dulati〇n, abbreviated as pwM) signal for compensation calculation to obtain a compensation signal; (302) subtracts the compensation signal or Adding - the compensation value, the pulse width modulation signal after compensation can be obtained as a throwing curve A2; (303) causing the control chip to control the speed of a fan according to the compensated pulse width modulation signal, The speed curve of the fan is linear and linear after compensation. (304) End. The linearity (ie, straight line) curve F2 of the fan speed corresponding to the PWM duty cycle of the present invention is significantly higher than that of the conventional fan. The smoothness and linearity of the coming. See Figure 4, 5, and 6 for the clearing, when the fan is in the open circuit (Open 7 1364159)
Loop)量測轉速控制時，透過該控制晶片讀取前述 訊號進行鑛運算後，得顺賴償峨，_控制晶片 依:償訊#:成去或增加前述補償值，俾得到補償後的脈寬 =變訊##_ 4)，並使前述㈣⑼依關償後的脈 見調變訊號控制風扇的轉速，令風扇轉速對應至雨工作 週期之曲線_额呈麵且雜之效果（參_ 5),且 達到風扇轉速穩定。Loop) When measuring the speed control, after reading the signal through the control chip to perform the mining operation, it is necessary to compensate for the _ control chip according to: compensation #: to go or increase the aforementioned compensation value, 俾 get the compensated pulse宽=变讯##_ 4), and the above (4) (9) according to the pulse after the adjustment of the pulse to control the speed of the fan, so that the fan speed corresponds to the curve of the rain cycle _ amount of surface and mixed effect (see _ 5), and the fan speed is stable.
曰以下舉-範例加以說明，若—9公分的風扇進行開迴 路量測轉速_時’經量爾知風扇在_工作週期臓 時的轉速為__(即錢），職在5_想的轉速值應 為2500RPM，但因為風扇馬達的因素實際上在剛工作曰 The following example - the example shows that if the fan of -9 cm is used to measure the speed of the open circuit _ when the speed of the fan is _ working period 为 __ (ie money), the job is 5_ think The speed value should be 2500RPM, but because the fan motor factor is actually working
週期5晴的風扇的轉速為__，因此前述理想轉速值 所為的PWM工作週期應為概，故需作補償，將原來剛 工作週期50%減去pwm工作週期丨⑽(即前述補償值)可得到 所需的PWM X作週期鄕，使得風扇轉速對應顺工作週 期之曲線經補償後可呈直線且線性的效果。 明參閱圖6、7係為風扇轉速與pWM工作週期之曲線示 思圖’圖中係針對-補償前的轉速曲線B1(即習知之上拋 曲線F1)以分段方式（如：分三段、四段、五段…等）進行 補乜演算後，而得到一補償後的轉速曲線β2(即本較佳實 施之線性（即直線）曲線F2)，則以下說明進行前述補償演 算包括依下列步驟： (400)開始； (401)將别述補償前的轉速曲線扪由p醫工作週期⑽至 8 1364159 PWM工作週期100%間分為三段進行補償演算，從圖6 中可知一第一段由PWM工作週期〇%至觥間做補償演 算，一第二段由p醫工作週期X%至Y%間做補償演 算，一第二段由PWM工作週期找至1〇〇%間做補償演 . 算；前述跳與冗的值為事先預知的數值，如X%為 ，料70%，且其數值依據補償前的轉速曲線的 變化而定知； φ (4〇2)首先，該第一段界定一直角三角形並對其斜率補償演 舁後’得到一第一直線L1 ;其中前述斜率補償演算 係將已知0%與X%兩點以内插法求得斜率（即前述第 一直線L1); (403)嗣’該第二段界定一平行四邊形並對其比例補償演算 後’得到-第二直線L2 ;其中前述比例補償演算係 將已知X%與γ%兩點以内插法求得斜率（即前述第二 直線L2); • (4〇4)該第三段界定一直角三角形並對其斜率補償演算 後，得到-第三直線L3 ;其中前述斜率補償演算係 將已知Y/6與100%兩點以内插法求得斜率（即前述第 三直線L3); (405) 將前述第-直線、第二直線及第三直線合併後，進而 得到補償後的轉速曲線B2 ; (406) 結束。 在此必需特別-提者’乃社所述’僅係本發明較佳 實施例，惟本發明實際實施時’前述PWM工作週期由〇〇/ 9 ° 1364159 100%間並獨限於分三段進行補償演算，亦可為分四段、 分五段、分六段、分七段…等進行補償演算，分段越^則 補償後的轉速曲線越趨於直線，則表示將得到更佳的線性 化，合先陳明。 ’ 1.紅所述’本發明之風雜速麵顯方法且有下列優 . .點:利賴償後的脈寬調變訊號，令風鱗速對應至剛 工作週期之曲線呈線性（即直線)曲線，以達到節省成本。 • 2.利用補償後的脈寬調變訊號，使風扇轉速對摩至PWM工 作週期之曲線呈線性（即直線）曲線，使得風扇轉速達到 穩定。 &利用補償後的脈寬調變訊驗觀扇，使風扇轉速的規 格容易制定。 按’以上· ’僅為本發明的一最佳具體實施例，惟本 發明的特徵並不舰於此，任何熟絲項技藝者在本發明 領域内，可輕^的變化或修飾，皆應涵蓋在以下本發 明的申請專利範圍中。 【圖式簡單說明】 帛1 ®係習知之PWM輸it!與輸人之崎示意圖； 第2圖係習知之風扇轉速與卫作週期之曲線示意圖； 第3圖係本發明之主要流程示意圖； 第4圖係本發明之PWM輸出與輸人之輯示意圖； 第5圖係本發明之風猶速紅作週期之曲線示意圖； 第6圖係本發明之風扇轉速與工作週期之補償曲線示意 10 1364159 圖； 第7圖係本發明之補償演算流程示意圖。The speed of the fan with a period of 5 is __, so the PWM duty cycle of the above ideal speed value should be general, so compensation is needed to subtract the pwm duty cycle 丨(10) from the original duty cycle of 50% (ie the aforementioned compensation value). The required PWM X period can be obtained, so that the fan speed can be linear and linear after compensating for the curve corresponding to the duty cycle. Referring to Figures 6 and 7, the graph of the fan speed and the pWM duty cycle is shown in the figure. The figure is for the pre-compensation speed curve B1 (that is, the conventional throwing curve F1) in a segmented manner (eg, three segments). After the compensation calculation is performed to obtain a compensated rotational speed curve β2 (i.e., the linear (ie, straight line) curve F2 of the preferred embodiment), the following description of the compensation calculation includes the following Step: (400) Start; (401) The speed curve before compensation is divided into three segments by the p medical working cycle (10) to 8 1364159 PWM working cycle 100%, and the first calculation is obtained from Fig. 6. The segment is compensated by the PWM duty cycle 〇% to the daytime, and the second segment is compensated by the p-working cycle X% to Y%, and the second segment is compensated by the PWM duty cycle to 1%%. The calculation of the above-mentioned jump and redundancy is a previously predicted value, such as X%, 70% of the material, and its value is determined according to the change of the speed curve before compensation; φ (4〇2) First, the first After defining a straight-angle triangle and compensating for its slope compensation, 'get a first straight line L1; The slope compensation calculation system uses the known 0% and X% points to interpolate the slope (ie the first straight line L1); (403) 嗣 'the second segment defines a parallelogram and compensates for its proportionality calculation' Obtaining a second straight line L2; wherein the aforementioned proportional compensation calculus calculates the slope by the interpolation of the known X% and γ% points (ie, the aforementioned second straight line L2); • (4〇4) the third segment defines a After the right triangle and the slope compensation calculation, the -third straight line L3 is obtained; wherein the slope compensation calculation system finds the slope by the interpolation of the known Y/6 and 100% points (ie, the third straight line L3); 405) Combine the first straight line, the second straight line, and the third straight line to obtain a compensated rotational speed curve B2; (406) ends. In this case, it is necessary to specifically describe the preferred embodiment of the present invention, but in the actual implementation of the present invention, the aforementioned PWM duty cycle is performed by 〇〇 / 9 ° 1364159 100% and is limited to three segments. The compensation calculus can also be compensated for four segments, five segments, six segments, seven segments, etc., and the more the segmentation curve, the more linear the compensation curve will be, which means better linearity. Hua, first and foremost Chen Ming. ' 1. Red said' the wind speed surface display method of the present invention has the following advantages: point: the pulse width modulation signal after the compensation, the curve corresponding to the wind cycle speed to the just working cycle is linear (ie Straight) curves to achieve cost savings. • 2. Using the compensated pulse width modulation signal, the curve of the fan speed to the PWM duty cycle is linear (ie, straight line), which makes the fan speed stable. & Using the compensated pulse width modulation to check the fan, the fan speed specification is easy to set. According to the above description, it is only a preferred embodiment of the present invention, but the features of the present invention are not in this case, and any skilled person in the field of the invention may be lightly changed or modified. It is covered by the scope of the patent application of the present invention below. [Simple diagram of the diagram] 帛1® is a schematic diagram of the PWM input it! and the input of the humans; Figure 2 is a schematic diagram of the fan speed and the guard cycle of the conventional; Figure 3 is a schematic diagram of the main flow of the present invention; 4 is a schematic diagram of a PWM output and input sequence of the present invention; FIG. 5 is a schematic diagram of a curve of a wind speed red cycle of the present invention; FIG. 6 is a schematic diagram of a compensation curve of a fan speed and a duty cycle of the present invention. 1364159 Figure; Figure 7 is a schematic diagram of the compensation calculation process of the present invention.
【主要元件符號說明】 下拋曲線 … A2 線性曲線 … F2 補償前曲線 … B1 補償後曲線 … B2 第一直線 … L1 第二直線 … L2 第三直線 … L3[Main component symbol description] Lower throw curve ... A2 Linear curve ... F2 Pre-compensation curve ... B1 Compensated curve ... B2 First line ... L1 Second line ... L2 Third line ... L3