201215773 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明係有關於一種風扇轉速控制電路，特別係有 關於一種可達成分段控制風扇轉速之風扇轉速控制電路 [先前技術] [0002] 請參閱第6圖’其係顯示一習知風扇轉速控制電路 200，該風扇轉速控制電路200係用以接收一目標轉速信 號Starget以控制一風扇300之轉速，該風扇轉速控制電 路200係包含一溫度量測模組一電性連接該溫度量 測模組21 〇之速調變模組2 2 0及一電性連接該轉速調變 模組220之風扇驅動模組2 30，該溫度量測模組21 〇係可 為一感測元件（如熱敏電阻）以量測該風扇3 〇 〇所處環境之 溫度而產生一溫度值’藉由該熱敏電阻之阻抗隨著系統 或環境温度而變化，以改變輸入風扇之驅動電源大小， 該轉速調變模組220係可依據該溫度值與該目標轉速信號 以產生一風扇控制信號，碑夙扇驅系模組MO係依據該風 扇控制信號以產生一驅動信號Sdrive而達成控制風扇轉 速之目的，該風扇300之風扇轉速係隨著該溫度值之增加 而提升，惟，習知之該風扇轉速控制電路2〇〇之風扇轉速 與溫度的變化曲線概略呈線性，因此無法達成分段控制 風扇轉速變化之功效。 【發明内容】 [0003] 本發明之主要目的在於提供一種風扇轉速控制電路 ，其係用以控制一風扇之轉速，該風扇轉速控制電路係 0992060549-0 099134667 表單編號A〇l〇i 第4頁/共24頁 201215773 G 包含一驅動ic及〆電性連接該驅動IC之溫控模組，該溫 控模組係包含-比軾器、一第一間關迴路及-第二開關 迴路，該比較器係町輸出一第一比較訊號或—第二比較 訊號，該第一開關迴路係具有一熱敏電阻，該熱敏電阻 係電性連接該比較器及該驅動1c，該第二開關迴路係電 性連接該比較器、該驅動IC及該第一開關迴路，當該比 較器輸出一第一比較訊號時，其係使知该第—開關迴路 導通及該第二開關迴路截止，以令該風扇產生一第一風 扇轉速，當該比軾器輸出一第二比較訊號時，其係使得 該第二開關迴路導通及5亥第一開關迴路截此，以令該風 扇產生一第二風扇轉速，該第二風扇轉速係大於該第一 風扇轉速。本發明係藉由該第一開關迴路及該第二開關 迴路之導通與否而使該風扇分別產生該第一風扇轉速及 該第二風扇轉速，由於該第一開關迴路及該第二開關迴 路之電路架構不同’因此該第二風扇轉速係大於該第一 風扇轉速，故可達成分段控制風扇轉速變化之功效。 Ο [0004] 【實施方式】 請參閱第1圖，其係本發明之一較佳實施例，一種風 扇轉速控制電路100，其係用以控制一風扇之轉速，該風 扇轉速控制電路100係包含一驅動1C 10以及一電性連接 該驅動1C 10之溫控模組20,該驅動1C 10係用以驅動一 風扇及該溫控模組20，該溫控模組20係包含一比較器21 099134667 、一第一開關迴路22及一第二開關迴路23，該比較器21 係可輸出一第一比較訊號或一第二比較訊號，該第一開 關迴路22係具有一熱敏電阻222，該熱敏電阻222係電性 連接該比較器21及該驅動ic 1〇，該第二開關迴路23係 表單編號A0101 第5頁/共24頁 0992060549-0 201215773 電性連接該比較器21、該驅動ic 1〇及該第/開關迴路 22富該比較器21輸出一第一比較訊號時，其係使得該 第一開關迴路22導通及該第二開關迴路23裁土’以令該 風扇產生一第一風扇轉速，當該比較器Μ輸出一第二比 較訊號時，其係使得該第二開關迴路23導通及該第一開 關迴路22截止，以令該風扇產生一第二風扇轉速，該第 〜風扇轉速係大於該第一風扇轉速’在本實施例中，該 第一開關迴路22係另包含有一第一電晶體221，該第二開 關迴路23係具有一第二電晶體231及一第三電晶體232， 。亥第一電晶體221係具有一第一極端22l a、一第二極端 221b及一第二極端22ic，該第二電晶體231係具有一第 四極端231a、一第五極端231b及-第六極端231c，該第 〜電晶體232係具有-第七極端232a、__第八極端““201215773 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a fan speed control circuit, and more particularly to a fan speed control circuit capable of achieving segmental control of fan speed [Prior Art] [0002] Please refer to FIG. 6 for a conventional fan speed control circuit 200 for receiving a target speed signal Starget for controlling the speed of a fan 300. The fan speed control circuit 200 includes A temperature measuring module is electrically connected to the temperature measuring module 21, and the speed modulation module 2 2 0 and a fan driving module 2 30 electrically connected to the speed modulation module 220, the temperature quantity The measuring module 21 can be a sensing component (such as a thermistor) to measure the temperature of the environment in which the fan 3 is located to generate a temperature value 'by the resistance of the thermistor along with the system or environment Changing the temperature to change the driving power of the input fan, the speed modulation module 220 can generate a fan control signal according to the temperature value and the target speed signal, and the fan drive system The MO system achieves the purpose of controlling the fan speed according to the fan control signal to generate a driving signal Sdrive. The fan speed of the fan 300 is increased as the temperature value increases. However, the fan speed control circuit 2 is conventionally known. The curve of the fan speed and temperature is roughly linear, so the effect of segmentally controlling the change of the fan speed cannot be achieved. SUMMARY OF THE INVENTION [0003] The main purpose of the present invention is to provide a fan speed control circuit for controlling the speed of a fan, the fan speed control circuit is 0992060549-0 099134667 Form No. A〇l〇i Page 4 A total of 24 pages 201215773 G includes a temperature control module for driving and driving the driver IC, the temperature control module includes a comparator, a first off circuit and a second switch circuit. The comparator system outputs a first comparison signal or a second comparison signal, the first switching circuit has a thermistor, the thermistor is electrically connected to the comparator and the driving 1c, the second switching circuit Electrically connecting the comparator, the driving IC and the first switching circuit. When the comparator outputs a first comparison signal, it is configured to enable the first switching circuit to be turned on and the second switching circuit to be turned off. The fan generates a first fan speed. When the comparator outputs a second comparison signal, the second switch circuit is turned on and the first switch circuit is cut off to enable the fan to generate a second fan. Speed, the Two lines is greater than the first fan speed fan speed. According to the invention, the fan generates the first fan speed and the second fan speed respectively by the conduction of the first switch circuit and the second switch circuit, because the first switch circuit and the second switch circuit The circuit structure is different. Therefore, the second fan speed is greater than the first fan speed, so that the effect of segmentally controlling the fan speed change can be achieved. [0004] [Embodiment] Referring to FIG. 1 , a preferred embodiment of the present invention is a fan speed control circuit 100 for controlling the rotational speed of a fan. The fan speed control circuit 100 includes A driving 1C 10 and a temperature control module 20 electrically connected to the driving 1C 10, the driving 1C 10 is for driving a fan and the temperature control module 20, the temperature control module 20 includes a comparator 21 099134667, a first switching circuit 22 and a second switching circuit 23, the comparator 21 can output a first comparison signal or a second comparison signal, the first switching circuit 22 has a thermistor 222, The thermistor 222 is electrically connected to the comparator 21 and the driving ic 1〇, and the second switching circuit 23 is connected to the comparator 21 by the form number A0101, page 5 of 24, 0992060549-0 201215773. When the ic 1 〇 and the first/switching circuit 22 are rich in the comparator 21 outputting a first comparison signal, the first switching circuit 22 is turned on and the second switching circuit 23 is cut off to enable the fan to generate a first a fan speed, when the comparator Μ output a second In the case of a signal, the second switch circuit 23 is turned on and the first switch circuit 22 is turned off, so that the fan generates a second fan speed, and the first fan speed is greater than the first fan speed. For example, the first switching circuit 22 further includes a first transistor 221, and the second switching circuit 23 has a second transistor 231 and a third transistor 232. The first transistor 221 has a first terminal 22l a, a second terminal 221b and a second terminal 22ic. The second transistor 231 has a fourth terminal 231a, a fifth terminal 231b and a sixth The extreme 231c, the first transistor 232 has a - seventh extreme 232a, __ eighth extreme ""
及》玄第八極端232b係電性連接該熱敏電阻m ’在本實施 4^ 9 9 1 K ^ Α ΛΤ i-r . .1.And "the eighth extreme 232b is electrically connected to the thermistor m' in this embodiment 4^9 9 1 K ^ Α ΛΤ i-r . .1.
例中’該第·~電晶體221係為-p型金氧半場效電晶體， 該第-電晶體221之該第—_，_%為閘極端，該第二 七極端232a係、為閘極端，該第人極端mb係為沒極端In the example, the first transistor 221 is a -p-type gold-oxygen half field effect transistor, the first -_, _% of the first transistor 221 is a gate terminal, and the second seventh terminal 232a is a gate. Extreme, the first person extreme mb is not extreme
趙232係為N型金氧半場效電晶體，該第三電 第七極瑞2 3 2 a.接盔Pd m .^ ____ 201215773 接該比較器21之該輸出端213。 [0005] Ο ο °月再參閱第1圖，在本實施例中，該熱敏電阻222係 ’、有第端222a及一第二端222b，該比較器21之該負 極端212 β玄第二極端、該第六極端231c及該驅動 1〇係電性連接該熱敏電阻222之該第一端222a，該第 八極端232b係電性連接該熱敏電阻222之該第二端22孔 此外，該溫控模組2〇係另具有一分壓電路24，該分壓 電路24係電性連接該比較器21及該驅動IC 1〇,較佳地 ，泫分廢電路24係具有一第一電阻241及一電性連接該第 一電阻241之第二電阻242，該分壓電路24之該第一電阻 241及該第二電阻242係電性連接該比較器21之該正極端 211，在本實施例中，該第一開關迴路22係另具有一第三 電阻25，該第三電阻25係電性連接該第有電晶體221之該 第三極端221c，另外，請再參閱第j圖，該第一開關迴路 22係另具有一第四電阻26，該第四電阻26係電性連接該 熱敏電阻222之該第二端222b及該第三電晶體232之該第 八極端232b，該第二p關迴路23係另具有一第五電阻27 ，該第五電阻27係電性連接該第二電晶體231之該第五極 端231b，請再參閱第1圖，在本實施例中，該驅動ic 1〇 係具有一電壓調制端11，該電壓調制端11係電性連接該 溫控模組20之該分壓電路24、該比較器21、該第一開關 迴路22及該第二開關迴路23，又，該驅動1C 1〇係另具 有一電壓訊號輸入端12，該電壓訊號輸入端12係電性連 接該熱敏電阻222之該第一端222a。 [0006] 請再參閱第1圖’當該驅動1C 10係驅動一風扇時， 099134667 表單編號A0101 第7頁/共24頁 0992060549-0 201215773 此時該熱敏電阻222之該第一端222a之端電壓係使得該比 較器21之該負極端21 2電壓高於該正極端211電壓，因此 該比較器21之該輸出端21 3係輸出該第一比較訊號，在本 實施例中，該第一比較訊號係為一低電位訊號，該低電 位訊號係使得該第一電晶體221導通，該第二電晶體231 及該第三電晶體232截止，此時電流係流經該第三電阻25 、該第一電晶體221、該熱敏電阻222及該第四電阻26而 流至接地，本實施例中係以負溫度係數之熱敏電阻為例 ，該熱敏電阻222係因溫度改變而產生阻值變化，且阻值 變化係帶動該熱敏電阻222之端電壓產生變化，該熱敏電 阻222之該第一端222a之端電壓係隨著溫度之上升而下降 ，由於該熱敏電阻222之該第一端222a之端電壓係與風扇 轉速成反比，故此時之轉速/溫度曲線如第5圖所示，係 形成一第一轉速曲線C1，請再參閱第1圖，隨後，當該第 一端222a之端電壓係持續隨著溫度上升而不斷下降，使 得該比較器21之該負極端212電壓低於該正極端211電壓 時，該輸出端213係輸出該第二比較訊號，在本實施例中 ，該第二比較訊號係為一高電位訊號，該高電位訊號係 使得該第一電晶體221截止，該第二電晶體231及該第三 電晶體232導通，此時電流係流經該第五電阻27、該第二 電晶體231、該熱敏電阻222及該第三電晶體232而流至 接地，由於該第一端222a之端電壓係與風扇轉速成反比 ，故此時之轉速/溫度曲線如第5圖所示，係形成一第二 轉速曲線C2。 [0007] 請參閱第2圖，其係本發明之第二實施例，第二實施 099134667 表單編號A0101 第8頁/共24頁 0992060549-0 201215773 例與第-實施例的差異在於第二實施例之該第二極端 22lb及該第，、極端231c係電性連接該熱敏電阻222之該 第端222a，该比較器21之該負極端212、該第八極端 2321)及。亥驅動ic 1〇係電性連接該熱敏電阻222之該第二 端222b此外，第二實施例之該第二關迴路係另具 有第，、電阻28，該第六電阻28係電性連接該熱敏電阻 222之該第二端222b及該第三電晶體挪之該第八極端 232b，又，該電壓訊號輸入端12係電性連接該熱敏電阻 222之該第二端222b。 請再參閱第2圖，當該驅動IC 10係驅動一風扇時， 此時該熱敏電阻222之該第二端222b之端電壓係使得該比 較器21之該負極端212電壓高於該#政鱗2U電壓，因此 該比較器21之該輸出端21 3係輸出該第一比較訊號，在本 實施例中，該第一比較訊號係為一低電位訊號，該低電 位訊號係使得該第一電晶體221導通，該第二電晶體231 及該第三電晶體232截止’此時電流谛流經該第三電阻25 、該第一電晶體221、該熱敏‘阻2^2及該第四電阻26而 流至接地，本實施例係以正溫度係數之熱敏電阻為例， 該熱敏電阻222係因溫度改變而產生阻值變化，且阻值變 化係帶動該熱敏電阻222之端電壓產生變化，該熱敏電阻 222之該第二端222b之端電壓係隨著溫度之上升而下降， 由於該第二端222b之端電壓係與風扇轉速成反比，故此 時之轉速/溫度曲線如第5圖所不’係形成一第一轉速曲 線C1，請再參閱第2圖，隨後，當該熱敏電阻222之該第 二端222b之端電壓係持續隨著溫度上升而不斷下降，使 099134667 表單編號A0101 第9頁/共24頁 0992060549-0 201215773 得該比較器21之該負極端21 2電壓低於該正極端211電壓 時，該輸出端2 1 3係輸出該第二比較訊號，在本實施例中 ，該第二比較訊號係為一高電位訊號，該高電位訊號係 使得該第一電晶體221截止，該第二電晶體231及該第三 電晶體232導通，此時電流係流經該第二電晶體231、該 熱敏電阻222、該第六電阻28及該第三電晶體232而流至 接地，由於熱敏電阻222之該第二端222b之端電壓係與風 扇轉速成反比，故此時之轉速/溫度曲線如第5圖所示， 係形成一第二轉速曲線C2。 [0009] 請參閱第3圖，其係本發明之第三實施例，第三實施 例與第一實施例的差異在於該第一電晶體221係為一N型 金氧半場效電晶體，該第一電晶體221之該第一極端221a 係為閘極端，該第二極端221b係為源極端，該第三極端 221c係為汲極端，該第二電晶體231係為一P型金氧半場 效電晶體，該第二電晶體2 31之該第四極端23 la係為閘極 端，該第五極端231b係為源極端，該第六極端231c係為 汲極端，該第三電晶體232係為一P型金氧半場效電晶體 ，該第三電晶體232之該第七極端232a係為閘極端，該第 八極端232b係為源極端，該第九極端232c係為汲極端， 該比較器21之該正極端211、該第二極端221b、該第六 極端231c及該驅動1C 10係電性連接該熱敏電阻222之該 第一端222a，該第八極端232b及該第四電阻26係連性連 接該熱敏電阻222之該第二端222b，此外，該分壓電路 2 4之該第一電阻2 41及該第二電阻2 4 2係電性連接該比較 器21之該負極端212。 099134667 表單編號A0101 第10頁/共24頁 0992060549-0 201215773 [0010] 請再參閱第3圖，當該驅動1C 10係驅動-風扇時， ο ο 此時該熱敏電阻222之該第-端222a之端電壓係使得該比 較器21之該正極端211電壓高於該負極端212電屋，因此 該比較器21之該輸出端213係輸出該第—比較訊號，在本 實施例中，該第-比較訊就係為—高電位訊號，該高電 位訊號係使得該第-電晶體221導通，該第二電晶體231 及該第三電晶體232截止’此時電流係流經該第三電障25 、該第-電晶體221、該熱敏電阻m及該第四電阻^而 流至接地，本實'施例係以負溫度係數之熱敏電阻為例， 該熱敏電阻222係因溫度改變而產生阻值變化且阻值變 化係帶動該熱敏電阻222之端電壓產生變化，該熱敏電阻 222之該第一端222a之端電壓係隨著溫戽之上升而下降， 由於該熱敏電阻222之該第一端222a之端電壓係與風扇轉 速成反比，故此時之轉速/溫度曲線如第5圖所示，係形 成一第一轉速曲線C1 请再參閱第3圖隨後，當該第一 端2 2 2 a之端電壓係持續隨著溫度上升而不斷下降，使得 該比較器21之該正極端211電屋低於該負極端21 2電壓時 ，該輸出端213係輪出該第二比較訊號，在本實施例中， 該第二比較訊號係為一低電位訊號，該低電位訊號係使 得該第一電晶體221截止，該第二電晶體231及該第三電 晶體232導通，此時電流係流經該第五電阻27、該第二電 晶體231、該熱敏電阻222及該第三電晶體232而流至接 地，由於該熱敏電阻222之該第一端222a之端電壓係與風 扇轉速成反比，故此時之轉速/溫度曲線如第5圖所示， 係形成一第二轉速曲線C2。 099134667 表單編號A0101 第11頁/共24 Μ 0992060549-0 201215773 [0011] [0012] 請參閱第4圖，其係本發明之第四實施例，第四實施 例與第二實施例相似，不同之處在於該第一電晶體2 2 1係 為一N型金氧半場效電晶體，該第一極端221a係為閘極端 ，該第二極端22 lb係為源極端，該第三極端221c係為汲 極端，該第二電晶體231係為一P型金氧半場效電晶體， 該第四極端231 a係為閘極端，該第五極端231b係為源極 端，該第六極端231c係為汲極端，該第三電晶體232係為 一P型金氧半場效電晶體，該第七極端232a係為閘極端， 該第八極端232b係為源極端，該第九極端232c係為汲極 端，該第二極端221b及該第六極端231c係電性連接該熱 敏電阻222之該第一端222a，該比較器21之該正極端211 、該第八極端232b及該驅動1C 10係電性連接該熱敏電 阻222之該第二端222b，此外，該分壓電路24之該第一 電阻241及該第二電阻242係電性連接該比較器21之該負 極端212。 請再參閱第4圖，當該驅動1C 10係驅動一風扇時， 此時該熱敏電阻222之該第二端222b之端電壓係使得該比 較器21之該正極端211電壓高於該負極端212電壓，因此 該比較器21之該輸出端21 3係輸出該第一比較訊號，在本 實施例中，該第一比較訊號係為一高電位訊號，該高電 位訊號係使得該第一電晶體221導通，該第二電晶體231 及該第三電晶體232截止，此時電流係流經該第三電阻25 、該第一電晶體221、該熱敏電阻222及該第四電阻26而 流至接地，本實施例係以正温度係數之熱敏電阻為例， 該熱敏電阻222係因溫度改變而產生阻值變化，且阻值變 099134667 表單編號A0101 第12頁/共24頁 0992060549-0 201215773 化係帶動該熱敏電阻222之端電壓產生變化，該熱敏電阻 222之該第二端222b之端電壓係隨著溫度之上升而下降， 由於該熱敏電阻222之該第二端222b之端電壓係與風扇轉 速成反比，故此時之轉速/度曲線如第5圖所示，係形 成一第一轉速曲線C1，請再參閱第4圖，隨後，當該熱敏 電阻222之該第二端222b之端電壓係持續隨著溫度上升而 不斷下降，使得該比較器21之該正極端211電壓低於該負 極端212電壓時，該輸出端213係輸出該第二比較訊號， Ο 在本實施例中，該第二比較訊號係為—低電位訊號，該 低電位訊號係使得讓..第.一電:舞禮22.1截止’該第二電晶體 231及該第二電晶體232導通，此時電流係流經該第二電 晶體231、該熱敏電阻222、該第六電阻28及該第三電晶 體232而流至接地，由於該熱敏電阻222之該第二端222b 之端電壓係與風扇轉速成反比’故此時:之轉速/溫度曲線 如第5圖所示，係形成一第二轉速曲線C2。 [0013] ❹ 本發明係藉由該溫控模組20之電路設計，當該熱敏 電阻222所感測之溫度較低晚，係可藉由該第一開關迴路 22以使該風扇產生該第一轉速曲線C1，當該熱敏電阻222 所感測之溫度較高時，係可藉由該第二開關迴路2 3以使 該風扇產生該第二轉速曲線C2，因此該風扇在不同之溫 度範圍中，可以該第一轉速曲線C1及該第二轉速曲線C2 進行運轉，以達成分段式控制風扇轉速之功效。 [0014] 本發明之保護範圍當視後附之申請專利範圍所界定 者為準，任何熟知此項技藝者，在不脫離本發明之精神 和範圍内所作之任何變化與修改，均屬於本發明之保護 099134667 表單編號A0101 第13頁/共24頁 0992060549-0 201215773 範圍。 【圖式簡單說明】 [0015] 099134667 第1圖：依據本發明之第一較佳實施例，一種風扇轉速控 制電路之電路圖。 第2圖：依據本發明之第二較佳實施例，該風扇轉速控制 電路之電路圖。 第3圖：依據本發明之第三較佳實施例，該風扇轉速控制 電路之電路圖。 第4圖：依據本發明之第四較佳實施例，該風扇轉速控制 電路之電路圖。 第5圖：該風扇轉速控制電路之風扇轉速/溫度曲線圖。 第6圖：習知風扇轉速控制電路之示意圖。 【主要元件符號說明】 [0016] 100 風扇轉速控制電路 10驅動1C 11 電壓調制端 12電壓訊號輸入端 20 溫控模組 21比較器 211 正極端 2' 12負極端 213 輸出端 22第 一開關迴路 221 第一電晶體 221a 第一極端 221b第二極端 221c 第三極端 222 熱敏電阻 222a 第一端 222b第二端 23第二開關迴路 231 第二電晶體 231a 第四極端 231b第五極端 231c 第六極端 232 第三電晶體 232a 第七極端 表單編號A0101 第14頁/共24頁 0992060549-0 201215773 232b第八極端 24分壓電路 242第二電阻 2 6第四電阻 2 8第六電阻 C2第二轉速曲線 210溫度量測模組 230風扇驅動模組 Starget目標轉速信號 232c第九極端 2 41第一電阻 2 5第三電阻 27第五電阻 C1第一轉速曲線 200風扇轉速控制電路 220轉速調變模組 300風扇 Sdrive驅動信號Zhao 232 is an N-type gold-oxygen half-field effect transistor, and the third electric seventh pole Rui 2 3 2 a. The helmet Pd m .^ ____ 201215773 is connected to the output end 213 of the comparator 21. [0005] Referring to FIG. 1 again, in the present embodiment, the thermistor 222 is 'having a first end 222a and a second end 222b, and the negative end 212 of the comparator 21 is β Xuandi. The second terminal 231c and the driving terminal 1 are electrically connected to the first end 222a of the thermistor 222. The eighth terminal 232b is electrically connected to the second end 22 of the thermistor 222. In addition, the temperature control module 2 further has a voltage dividing circuit 24, and the voltage dividing circuit 24 is electrically connected to the comparator 21 and the driving IC 1〇, preferably, the circuit is divided into 24 circuits. A first resistor 241 and a second resistor 242 electrically connected to the first resistor 241, the first resistor 241 and the second resistor 242 of the voltage dividing circuit 24 are electrically connected to the comparator 21 The positive pole 211, in the embodiment, the first switch circuit 22 has a third resistor 25, the third resistor 25 is electrically connected to the third terminal 221c of the first transistor 221, and Referring to the figure j, the first switch circuit 22 further has a fourth resistor 26, and the fourth resistor 26 is electrically connected to the second of the thermistor 222. 222b and the eighth terminal 232b of the third transistor 232, the second p-off circuit 23 further has a fifth resistor 27 electrically connected to the fifth of the second transistor 231 The terminal 231b has a voltage modulation terminal 11 electrically connected to the voltage dividing circuit of the temperature control module 20. The comparator 21, the first switch circuit 22 and the second switch circuit 23, and the drive 1C1〇 further has a voltage signal input terminal 12, and the voltage signal input terminal 12 is electrically connected to the heat. The first end 222a of the varistor 222. [0006] Please refer to FIG. 1 'When the driver 1C 10 series drives a fan, 099134667 Form No. A0101 Page 7 / Total 24 Page 0992060549-0 201215773 At this time, the first end 222a of the thermistor 222 The terminal voltage is such that the voltage of the negative terminal 21 2 of the comparator 21 is higher than the voltage of the positive terminal 211, so the output terminal 21 of the comparator 21 outputs the first comparison signal. In this embodiment, the first A comparison signal is a low potential signal, the low potential signal is such that the first transistor 221 is turned on, the second transistor 231 and the third transistor 232 are turned off, and the current flows through the third resistor 25 The first transistor 221, the thermistor 222 and the fourth resistor 26 flow to the ground. In this embodiment, a thermistor with a negative temperature coefficient is taken as an example, and the thermistor 222 is changed due to temperature. A change in the resistance value is generated, and a change in the resistance value causes a change in the voltage of the terminal of the thermistor 222. The voltage at the end of the first end 222a of the thermistor 222 decreases as the temperature rises due to the thermistor. The end voltage of the first end 222a of the 222 is a fan The speed is inversely proportional, so the speed/temperature curve at this time is as shown in Fig. 5, forming a first speed curve C1. Please refer to FIG. 1 again. Then, when the voltage of the first end 222a continues to rise with temperature. When the voltage of the negative terminal 212 of the comparator 21 is lower than the voltage of the positive terminal 211, the output terminal 213 outputs the second comparison signal. In this embodiment, the second comparison signal is one. a high potential signal, the high potential signal is such that the first transistor 221 is turned off, the second transistor 231 and the third transistor 232 are turned on, and current flows through the fifth resistor 27 and the second transistor. 231. The thermistor 222 and the third transistor 232 flow to the ground. Since the voltage of the terminal end of the first end 222a is inversely proportional to the rotational speed of the fan, the speed/temperature curve at this time is as shown in FIG. A second speed curve C2 is formed. Please refer to FIG. 2, which is a second embodiment of the present invention. The second embodiment is 099134667. Form number A0101. Page 8/24 pages 0992060549-0 201215773 The difference between the example and the first embodiment lies in the second embodiment. The second terminal 22lb and the terminal 231c are electrically connected to the first end 222a of the thermistor 222, the negative terminal 212 of the comparator 21, and the eighth terminal 2321). The second driving circuit 222 is electrically connected to the second end 222b of the thermistor 222. In addition, the second closing circuit of the second embodiment further has a first, a resistor 28, and the sixth resistor 28 is electrically connected. The second end 222b of the thermistor 222 and the third transistor 232b are shifted, and the voltage signal input terminal 12 is electrically connected to the second end 222b of the thermistor 222. Referring to FIG. 2, when the driving IC 10 drives a fan, the voltage of the second end 222b of the thermistor 222 is such that the voltage of the negative terminal 212 of the comparator 21 is higher than the # The second level of the comparator 21 outputs the first comparison signal. In this embodiment, the first comparison signal is a low potential signal, and the low potential signal makes the first A transistor 221 is turned on, and the second transistor 231 and the third transistor 232 are turned off. At this time, current flows through the third resistor 25, the first transistor 221, the thermal resistor 2^2, and the The fourth resistor 26 flows to the ground. In this embodiment, the thermistor of the positive temperature coefficient is taken as an example. The thermistor 222 changes the resistance due to the temperature change, and the resistance change drives the thermistor 222. The voltage at the terminal end of the thermistor 222 decreases as the temperature rises. Since the voltage at the end of the second terminal 222b is inversely proportional to the rotational speed of the fan, the rotational speed at this time/ The temperature curve does not form a first speed curve C1 as shown in FIG. Referring again to FIG. 2, subsequently, when the voltage of the terminal end of the second end 222b of the thermistor 222 continues to decrease as the temperature rises, the 099134667 form number A0101 page 9/24 pages 0992060549-0 201215773 When the voltage of the negative terminal 21 2 of the comparator 21 is lower than the voltage of the positive terminal 211, the output terminal 2 1 3 outputs the second comparison signal. In this embodiment, the second comparison signal is a high potential. The high-potential signal causes the first transistor 221 to be turned off, the second transistor 231 and the third transistor 232 are turned on, and current flows through the second transistor 231, the thermistor 222, The sixth resistor 28 and the third transistor 232 flow to the ground. Since the voltage of the second end 222b of the thermistor 222 is inversely proportional to the fan speed, the speed/temperature curve at this time is as shown in FIG. Shown, a second speed curve C2 is formed. Referring to FIG. 3, which is a third embodiment of the present invention, the third embodiment is different from the first embodiment in that the first transistor 221 is an N-type metal oxide half field effect transistor. The first terminal 221a of the first transistor 221 is a gate terminal, the second terminal 221b is a source terminal, the third terminal 221c is a 汲 terminal, and the second transistor 231 is a P-type MOS half field. An effect transistor, the fourth terminal 23 la of the second transistor 2 31 is a gate terminal, the fifth terminal 231b is a source terminal, and the sixth terminal 231c is a 汲 terminal, and the third transistor 232 is The P-type MOS field effect transistor, the seventh terminal 232a of the third transistor 232 is a gate terminal, the eighth terminal 232b is a source terminal, and the ninth terminal 232c is a 汲 terminal, the comparison The positive terminal 211, the second terminal 221b, the sixth terminal 231c, and the driving 1C 10 of the device 21 are electrically connected to the first end 222a of the thermistor 222, the eighth terminal 232b and the fourth resistor 26 is connected to the second end 222b of the thermistor 222, and further, the first electric circuit of the voltage dividing circuit 24 Resistor 241 and the second line 242 is electrically connected to the comparator 21 of the negative terminal 212. 099134667 Form No. A0101 Page 10 of 24 0992060549-0 201215773 [0010] Please refer to FIG. 3 again, when the 1C 10 series drive-fan is driven, ο ο the first end of the thermistor 222 The voltage of the terminal 222a is such that the voltage of the positive terminal 211 of the comparator 21 is higher than that of the negative terminal 212. Therefore, the output terminal 213 of the comparator 21 outputs the first comparison signal. In this embodiment, The first comparison message is a high potential signal, the high potential signal is such that the first transistor 221 is turned on, and the second transistor 231 and the third transistor 232 are turned off. The electric barrier 25, the first transistor 221, the thermistor m and the fourth resistor flow to the ground. The actual embodiment is a negative temperature coefficient thermistor, and the thermistor 222 is The resistance value changes due to the temperature change and the resistance value changes the voltage of the terminal of the thermistor 222, and the voltage of the terminal end of the first end 222a of the thermistor 222 decreases as the temperature rises, due to The terminal voltage of the first end 222a of the thermistor 222 is inversely proportional to the fan speed Therefore, the speed/temperature curve at this time is as shown in Fig. 5, and a first speed curve C1 is formed. Please refer to FIG. 3, and then the voltage at the end of the first end 2 2 2 a continues to rise with temperature. When the positive terminal 211 of the comparator 21 is lower than the voltage of the negative terminal 21 2, the output terminal 213 rotates the second comparison signal. In this embodiment, the second comparison signal is Is a low potential signal, the low potential signal is such that the first transistor 221 is turned off, the second transistor 231 and the third transistor 232 are turned on, and the current flows through the fifth resistor 27, the second The transistor 231, the thermistor 222 and the third transistor 232 flow to the ground. Since the voltage of the first end 222a of the thermistor 222 is inversely proportional to the fan speed, the speed/temperature curve at this time As shown in Fig. 5, a second rotational speed curve C2 is formed. 099134667 Form No. A0101 Page 11 of 24 Μ 0992060549-0 201215773 [0012] Please refer to FIG. 4, which is a fourth embodiment of the present invention, and the fourth embodiment is similar to the second embodiment, and different The first transistor 2 2 1 is an N-type MOS field effect transistor, the first terminal 221a is a gate terminal, and the second terminal 22 lb is a source terminal, and the third terminal 221c is At the extreme end, the second transistor 231 is a P-type MOS field effect transistor, the fourth terminal 231a is a gate terminal, the fifth terminal 231b is a source terminal, and the sixth terminal 231c is a 汲. In an extreme, the third transistor 232 is a P-type MOS field effect transistor, the seventh terminal 232a is a gate terminal, the eighth terminal 232b is a source terminal, and the ninth terminal 232c is a 汲 terminal. The second terminal 221b and the sixth terminal 231c are electrically connected to the first end 222a of the thermistor 222. The positive terminal 211, the eighth terminal 232b and the driving 1C10 of the comparator 21 are electrically connected. Connecting the second end 222b of the thermistor 222, and further, the first resistor 241 of the voltage dividing circuit 24 The second resistor 242 is electrically connected to the negative terminal 212 of the comparator 21. Referring to FIG. 4, when the driving 1C 10 system drives a fan, the voltage of the terminal end of the second end 222b of the thermistor 222 is such that the voltage of the positive terminal 211 of the comparator 21 is higher than the negative voltage. The output voltage of the comparator 21 is the first comparison signal. In this embodiment, the first comparison signal is a high potential signal, and the high potential signal is the first The transistor 221 is turned on, and the second transistor 231 and the third transistor 232 are turned off. At this time, a current flows through the third resistor 25, the first transistor 221, the thermistor 222, and the fourth resistor 26. In the present embodiment, the thermistor of the positive temperature coefficient is taken as an example. The thermistor 222 is changed in resistance due to temperature change, and the resistance value is changed to 099134667. Form No. A0101 Page 12 of 24 0992060549-0 201215773 The system drives the voltage of the terminal of the thermistor 222 to change, and the voltage of the terminal end of the second end 222b of the thermistor 222 decreases as the temperature rises, because the thermistor 222 The voltage at the end of the second end 222b is opposite to the fan speed. Therefore, the speed/degree curve at this time is as shown in FIG. 5, and a first speed curve C1 is formed. Please refer to FIG. 4 again. Then, when the voltage of the second end 222b of the thermistor 222 is The output terminal 213 outputs the second comparison signal when the voltage of the positive terminal 211 of the comparator 21 is lower than the voltage of the negative terminal 212, Ο in the embodiment, the first The second comparison signal is a low-potential signal, and the low-level signal is such that: the first electricity: the dance ceremony 22.1 is turned off, the second transistor 231 and the second transistor 232 are turned on, and the current flows through the current system. The second transistor 231, the thermistor 222, the sixth resistor 28 and the third transistor 232 flow to the ground, because the voltage of the terminal end of the second end 222b of the thermistor 222 is different from the fan speed. In contrast, the speed/temperature curve at this time is as shown in Fig. 5, and a second speed curve C2 is formed. [0013] The present invention is designed by the circuit of the temperature control module 20, when the temperature sensed by the thermistor 222 is relatively late, the first switch circuit 22 can be used to cause the fan to generate the first a speed curve C1, when the temperature sensed by the thermistor 222 is high, the second switching circuit 23 can be used to cause the fan to generate the second speed curve C2, so the fan is in different temperature ranges. The first speed curve C1 and the second speed curve C2 can be operated to achieve the effect of segmentally controlling the fan speed. [0014] The scope of the present invention is defined by the scope of the appended claims. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the invention belong to the present invention. Protection 099134667 Form No. A0101 Page 13 of 24 0992060549-0 201215773 Scope. BRIEF DESCRIPTION OF THE DRAWINGS [0015] FIG. 1 is a circuit diagram of a fan speed control circuit in accordance with a first preferred embodiment of the present invention. Figure 2 is a circuit diagram of the fan speed control circuit in accordance with a second preferred embodiment of the present invention. Figure 3 is a circuit diagram of the fan speed control circuit in accordance with a third preferred embodiment of the present invention. Figure 4 is a circuit diagram of the fan speed control circuit in accordance with a fourth preferred embodiment of the present invention. Figure 5: Fan speed/temperature graph of the fan speed control circuit. Figure 6: Schematic diagram of a conventional fan speed control circuit. [Main component symbol description] [0016] 100 fan speed control circuit 10 drives 1C 11 voltage modulation terminal 12 voltage signal input terminal 20 temperature control module 21 comparator 211 positive terminal 2' 12 negative terminal 213 output terminal 22 first switching circuit 221 first transistor 221a first terminal 221b second terminal 221c third terminal 222 thermistor 222a first end 222b second end 23 second switching circuit 231 second transistor 231a fourth terminal 231b fifth terminal 231c sixth Extreme 232 Third transistor 232a Seventh extreme form number A0101 Page 14/24 pages 0992060549-0 201215773 232b eighth extreme 24 voltage divider circuit 242 second resistor 2 6 fourth resistor 2 8 sixth resistor C2 second Speed curve 210 temperature measurement module 230 fan drive module Starget target speed signal 232c ninth extreme 2 41 first resistor 2 5 third resistor 27 fifth resistor C1 first speed curve 200 fan speed control circuit 220 speed modulation mode Group 300 fan Sdrive drive signal
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