201128075 六、發明說明： 【發明所屬之技術領域】 本發明是有關於-種控制方法，特別是指一種風扇轉 速控制方法。 【先前技術】 現有散熱風扇的散熱效果多取決風扇的轉速，風扇的 轉速愈高散熱效果愈好，但是，相對的風扇的轉速愈高， 所產生的噪音也愈大而且也較為耗電，因此，現有風扇多 會在如圖1所示之風扇性能曲線（靜壓_風量曲線，p_Q曲線） 上決定風扇的最佳出風量與靜壓值，以在散熱效果、噪音 值與耗電量間取得平衡。 隨著科技的進步，各式各樣電子產品的體積也愈來愈 小，但是元件發熱量卻愈來愈高，因此，散熱風扇除了降 低7L件運作時所產生的熱量外，還需因應空間狹小，以及 運作時間之長短所造成之積熱現象進行轉速的調整。 現有Φ見的散熱風扇轉速控制方法，如中華民國公告 第1295421號「風扇轉速自動控制方法」發明專利，利用感 測溫度以調整風扇的轉速，以達成依據溫度調整風扇轉速 穩疋散熱效果的目的，雖然利用周遭溫度的變化以改變風 扇轉速能適用於大多數的散熱需求。 但是’周遭溫度的變化有可能是因為散熱風扇的入風 σ或疋出風口遭受遮蔽，或是流體阻力的改變，造成出風 量降低、靜壓值升冑，使得散熱風扇的f史熱效果降低而產 生積熱所引起’因此，利用周遭溫度的變化以改變風扇轉 201128075 扇轉速控制方法’並不適用於入風口或是出風口會 不疋時$到遮蔽，或流體阻力可能發生改變處之風扇。 【發明内容】 曰因此本發明之目的，即在提供_種能維持在最佳出 風置與靜壓值的風扇轉速控制方法。 於是，本發明風扇轉速控制方法，依序包含一伯測步 驟、-判斷步驟、-調整步驟，及一禮認步驟。 該偵測步驟是利用一控制器偵測風扇運轉時所產生的 一運㈣阻值；該商㈣是利賴控㈣判斷該運轉流 值疋否j於。又定流阻值，若是該運轉流阻值小於該設 定流阻值則進入下-步驟，若是該運轉流阻值不小於該設 定流阻值則回復至該偵測步驟。 。亥調整步驟是由該控制器輸出—脈衝寬度調變信號增 加風扇的轉速’ ju貞測對應該轉速所產生的一調整流阻值 ;該確認步驟是利用該控制器判斷該調整流阻值是否小於 〇 X & W阻值# 6亥調整流阻值不小於該設定流阻值則 固定該風扇的轉速，若該調整流阻值小於該設定流阻值， 則回復至該調整㈣直到風扇的轉速達最高值。 本發明之功效在於：利用偵測風扇運轉時所產生的該 運轉流阻值與該设定流阻值做比較，以調整風扇的轉速， 不但無須增加額外構件，而且由於風扇的出風量與風扇的 被遮蔽率呈反比’而出風量又受該調整流阻值控制，使風 扇在-定的遮蔽率下仍能維持在最佳出風量與靜壓值。 【實施方式】 201128075 、有關本發明之前述及其他技術内容、特點與功效，在 、下配。參考圖式之—個較佳實施例的詳細 清楚的呈現。 參閱圖2’本發明風扇轉速控制方法之較佳實施例，依 序包含-偵測步驟u、—判斷步驟12、一調整步驟U，及 一確認步驟14。 •參閱圖2、3，該偵測步驟n是利用一控制器偵測風扇 運轉時所產生的—運轉流阻值。於本較佳實施例中，該控 制器疋一可程式控制的微控制單元（Micr〇 C〇ntr〇Uer Unh， MCU)，而該運轉流阻值是驅動風扇所需的電流值，並與該 風扇運轉時的遮蔽率呈反比。當然在實際應用上，該控制 器也可以是積體電路，而該運轉流阻值則也可以是驅動該 風扇所需的電壓值，或是風扇運轉時流經線圈之電流所產 生的磁通量。 該判斷步驟12是利用該控制器判斷該運轉流阻值是否 小於一設定流阻值’若是該運轉流阻值小於該設定流阻值 則進入下一步驟’若是該運轉流阻值不小於該設定流阻值 則回復至該偵測步驟11。於本較佳實施例中，該設定流阻 值是風扇性能曲線上最佳出風量與靜壓值所對應的電流值 〇 該調整步驟13是由該控制器輸出一脈衝寬度調變信號 (Pulse Width Modulation, PWM)增加風扇的轉速，並偵測對 應該轉速所產生的一調整流阻值。於本較佳實施中，該調 整流阻值是對應風扇經脈衝寬度調變信號增加轉速後的電 201128075 流值。201128075 VI. Description of the Invention: [Technical Field] The present invention relates to a control method, and more particularly to a fan speed control method. [Prior Art] The heat dissipation effect of the existing cooling fan depends on the rotation speed of the fan. The higher the rotation speed of the fan, the better the heat dissipation effect. However, the higher the rotation speed of the opposite fan, the greater the noise generated and the more power consumption. The existing fan will determine the optimal air volume and static pressure value of the fan in the fan performance curve (static pressure _ air volume curve, p_Q curve) as shown in Figure 1, in order to reduce the heat dissipation effect, noise value and power consumption. Get balanced. With the advancement of technology, the volume of various electronic products is getting smaller and smaller, but the heat generation of components is getting higher and higher. Therefore, in addition to reducing the heat generated by the operation of 7L parts, the cooling fan needs space. The small and small, and the length of the operation caused by the accumulation of heat caused by the adjustment of the speed. The existing φ sees the cooling fan speed control method, such as the Republic of China Announcement No. 1295421 "fan speed automatic control method" invention patent, the use of sensing temperature to adjust the fan speed, in order to achieve the purpose of temperature adjustment fan speed stability cooling effect Although the use of changes in ambient temperature to change the fan speed can be applied to most heat dissipation requirements. However, the change in ambient temperature may be caused by the inflow σ of the cooling fan or the obstruction of the outlet, or the change of the fluid resistance, resulting in a decrease in the air volume and a rise in the static pressure value, so that the heat history of the cooling fan is reduced. And the accumulation of heat caused by 'Therefore, using the change of ambient temperature to change the fan to 201128075 fan speed control method' is not suitable for the air inlet or the air outlet will not be able to cover, or the fluid resistance may change. fan. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a fan speed control method capable of maintaining an optimum air outlet and static pressure value. Therefore, the fan speed control method of the present invention includes a step of measuring, a determining step, an adjusting step, and a step of acknowledging. The detecting step is to use a controller to detect the (four) resistance value generated when the fan is running; the quotient (4) is the Lilai control (4) to determine whether the operational flow value is 于 or not. And a constant flow resistance value, if the running flow resistance value is less than the set flow resistance value, the process proceeds to the next step, and if the running flow resistance value is not less than the set flow resistance value, the process returns to the detecting step. . The step of adjusting the sea is performed by the controller - the pulse width modulation signal increases the rotation speed of the fan, and the adjustment flow resistance value corresponding to the rotation speed is measured. The confirmation step is to determine whether the adjustment flow resistance value is determined by the controller. Less than 〇X & W resistance value #6海 Adjusting the flow resistance value is not less than the set flow resistance value to fix the rotation speed of the fan. If the adjustment flow resistance value is less than the set flow resistance value, return to the adjustment (4) until the fan The maximum speed is reached. The effect of the invention is that the running flow resistance value generated when the detecting fan is operated is compared with the set flow resistance value to adjust the rotating speed of the fan, not only without adding additional components, but also because of the fan outlet amount and the fan. The obscuration rate is inversely proportional to the air volume and is controlled by the adjusted flow resistance value, so that the fan can maintain the optimal air volume and static pressure value at a predetermined shielding rate. [Embodiment] 201128075, the foregoing and other technical contents, features and effects of the present invention are provided below and below. A detailed and clear representation of a preferred embodiment of the drawings is provided. Referring to Fig. 2', a preferred embodiment of the fan speed control method of the present invention comprises, in order, a detecting step u, a determining step 12, an adjusting step U, and a confirming step 14. • Referring to Figures 2 and 3, the detection step n uses a controller to detect the operating flow resistance value generated when the fan is running. In the preferred embodiment, the controller is a programmable micro-control unit (Micr〇C〇ntr〇Uer Unh, MCU), and the operating flow resistance value is a current value required to drive the fan, and The shielding rate when the fan is running is inversely proportional. Of course, in practical applications, the controller may also be an integrated circuit, and the operational flow resistance value may be the voltage value required to drive the fan or the magnetic flux generated by the current flowing through the coil when the fan is running. The determining step 12 is to use the controller to determine whether the operating flow resistance value is less than a set flow resistance value. If the operating flow resistance value is less than the set flow resistance value, proceed to the next step, if the operating flow resistance value is not less than the Setting the flow resistance value returns to the detecting step 11. In the preferred embodiment, the set flow resistance value is a current value corresponding to the optimal air flow rate and the static pressure value on the fan performance curve. The adjusting step 13 is to output a pulse width modulation signal by the controller (Pulse). Width Modulation, PWM) increases the speed of the fan and detects an adjusted flow resistance value corresponding to the speed. In the preferred embodiment, the rectification resistance value is a current 201128075 current value corresponding to a fan that increases the rotational speed after the pulse width modulation signal.
該確3忍步驟1 4异：丨田·>* 4«λ· * I 疋矛i用5亥控制器判斷該調整流阻值是否 'IHx 阻值’若該調整流阻值不小於該流阻值 則固疋該風扇的轉速’若該調整流阻值小於該設定流阻 值’則回復至該調整步驟13直到風扇的轉速達最高值。 參閱圖4 S a月人以出風口的不同遮蔽率進行實驗以 驗證本發明風扇轉速控制方法的功效，當然可Μ以入風 口的不同遮蔽率進行實驗，依然可以達成相同的結果。 在此要先說明的是，風扇的出風量與出（入）風口的遮蔽 率呈反比，而且出風量又取決於風扇的轉速，而風扇的轉 速改變又是與調整流阻值成正比，因&，本實驗例是以風 扇的轉速代表不同的調整流阻值進行說明。 其中，圖4右側的縱軸是出風量的比率、左側的縱軸 是風扇的轉速，而橫軸則是代表出風口的不同遮蔽率。由 圖3中所示可知，當出風口的遮蔽率為〇〜5%且風扇的轉速 疋4000rpm時，是100%的出風量，也就是代表在出風口的 遮蔽率為0〜5%時，400〇rpm轉速即可維持該風扇於最佳的 出風量與靜壓值。 而當出風口的遮蔽率為1〇%~65%時，利用將風扇的轉 速由41〇〇rpm逐漸提高至5500rpm，仍可使出風量維持在 100%，也就是說，在出風口的遮蔽率為10%〜6S%時利 用脈衝寬度調變信號提高風扇的轉速，仍然能維持該風扇 於最佳的出風量與靜壓值。 當出風口的遮蔽率增加至70%〜100%時，風扇的轉速 201128075 雖提升至560〇rpm，而出風量卻逐漸遞減至8〇%，這代表 此風扇的轉速最高為56〇〇rpm，而且當出風口的遮蔽率增加 至70/6〜1〇〇%，即會造成該風扇的出風量降低、靜壓值升 南。 由上述說明可知，利用偵測風扇運轉時所產生的該運 轉抓阻值與②設定流阻值做比較，只要ih (人）風σ受到遮蔽 f是流體阻力發生變化，就可以立刻藉由增加風扇的轉速 提高出風量，使風扇於一定的遮蔽率下仍維持在最佳出風 $與靜壓值，而且無須增加額外的設備，對於風扇轉速的 控制不但更為即時’也能應用出(入)風口不定時受到遮蔽， 或流體阻力可能發生改變之風扇的轉速控制上。 .’’τ'上所述，本發明風扇轉速控制方法，利用偵測風扇 運轉時所產生的該運轉流阻值與該設定流阻值做比較，以 調整風扇的轉速’不但無須增加額外構件，而且只要出（入） 風口受到遮蔽，或是流體阻力發生變化，就可以立刻藉由 增加風扇的轉速提高出風量，使風扇於一定的遮蔽率下仍 維持在最佳出風量與靜壓值，而且錢增加額外的設備， 對於風扇轉速的控制不但更為即時，也能應用出（入）風口不 定時受到遮蔽，或流體阻力可能發生改變之風扇的轉速控 制上’故禮貫能達成本發明之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 201128075 【圖式簡單說明】 圖1是一特性曲線圖，說明現有散熱風扇的靜廢-風量 特性曲線： 圖2是一流程圖，說明本發明風扇轉速控制方法之較 佳實施例； 及 圖3是一流程圖 圖4是一比較圖 輔助說明圖2中每一步驟的過程； 5月該較佳實施例的實驗結果。 201128075 ' 【主要元件符號說明】 11 偵測步驟 14 確認步驟 12 判斷步驟 13 調整步驟It is true that 3 steps 1 and 4 are different: 丨田·>* 4«λ· * I 疋 spi i use 5 hai controller to determine whether the adjusted flow resistance value is 'IHx resistance value' if the adjusted flow resistance value is not less than The flow resistance value fixes the rotation speed of the fan 'If the adjustment flow resistance value is less than the set flow resistance value', then returns to the adjustment step 13 until the rotation speed of the fan reaches the highest value. Referring to Fig. 4, the S a month experimented with different shielding rates of the air outlet to verify the effectiveness of the fan speed control method of the present invention. Of course, the experiment can be carried out with different shielding rates of the air inlet, and the same result can still be achieved. It should be noted here that the air output of the fan is inversely proportional to the shielding rate of the air inlet (inlet), and the air volume depends on the speed of the fan, and the speed change of the fan is proportional to the value of the adjusted flow resistance. &, this experimental example is based on the fan speed representing different adjusted flow resistance values. Here, the vertical axis on the right side of Fig. 4 is the ratio of the air volume, the vertical axis on the left side is the rotation speed of the fan, and the horizontal axis represents the different shielding rate of the air outlet. As shown in FIG. 3, when the shielding rate of the air outlet is 〇~5% and the rotation speed of the fan is 疋4000 rpm, it is 100% of the air volume, that is, when the shielding rate of the air outlet is 0 to 5%. The optimum airflow and static pressure of the fan can be maintained at 400 rpm. When the shielding rate of the air outlet is 1〇%~65%, the fan speed can be gradually increased from 41〇〇rpm to 5500rpm, and the air volume can be maintained at 100%, that is, the air outlet is shielded. When the rate is 10%~6S%, the pulse width modulation signal is used to increase the fan speed, and the fan can maintain the optimal air volume and static pressure value. When the shielding rate of the air outlet increases to 70%~100%, the fan speed 201128075 is increased to 560〇rpm, and the air volume is gradually reduced to 8〇%, which means the fan speed is up to 56〇〇rpm. Moreover, when the shielding rate of the air outlet is increased to 70/6 to 1%, the air volume of the fan is lowered and the static pressure value is increased. It can be seen from the above description that the running gripping resistance value generated by detecting the fan operation is compared with the set flow resistance value of 2, and as long as the ih (human) wind σ is blocked, the fluid resistance changes, and it can be immediately increased. The fan speed increases the air volume, so that the fan maintains the optimal air output and static pressure value at a certain shielding rate, and does not need to add additional equipment. The control of the fan speed is not only more immediate but also applicable ( The wind inlet is blocked from time to time, or the speed of the fan whose fluid resistance may change is controlled. As described above, the fan speed control method of the present invention compares the operating flow resistance value generated when the detecting fan is operated with the set flow resistance value to adjust the rotating speed of the fan' without adding additional components. And as long as the air inlet is blocked or the fluid resistance changes, the air volume can be increased immediately by increasing the fan speed, so that the fan maintains the optimal air volume and static pressure value at a certain shielding rate. And the money adds extra equipment, the control of the fan speed is not only more immediate, but also the application of the (in) air outlet is blocked from time to time, or the fluid resistance may change the speed control of the fan. The purpose of the invention. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. 201128075 [Simplified schematic diagram] FIG. 1 is a characteristic diagram illustrating a static waste-air volume characteristic curve of a conventional heat dissipation fan: FIG. 2 is a flow chart illustrating a preferred embodiment of a method for controlling a fan speed according to the present invention; and FIG. Figure 4 is a comparison diagram to assist in the process of each step in Figure 2; the experimental results of the preferred embodiment in May. 201128075 ' [Main component symbol description] 11 Detection procedure 14 Confirmation step 12 Judgment step 13 Adjustment procedure