1335721 ___ 1 t 2010年5月門日修正 ' _ • 六、發明說明： · - 【發明所屬之技術領域】 本發明係關於一種控制裝置，特別關於一種風扇控制裝置。 【先前技術】 風扇係已常用於現今的電子裝置之中’藉以提供散熱或導流 的機制。 如第1圖所示，習知風扇控制裝置1係接收一控制訊號Scnt 鲁 來控制風扇2之轉速。該風扇控制裝置1係包括一輸入電路η與 一驅動電路12，該輸入電路11係接收該控制訊號SCNT，該輸入電 路11係提供穩定的工作點以使該控制訊號SCNT得以正確地輸入至 該驅動電路12 ’該驅動電路12係依據該控制訊號sCNT來控制該 風扇2之轉速。 然而，當啟動或重置時，該風扇2或該風扇控制裝置1皆無 可避免地產生如第2圖所示之啟動電流’啟動電流將會對於該風 扇2或該風扇控制裝置卜甚至是其應用的設備或電路造成電流過 载。 雖然在該驅動電路12中可加入限流功能，但限流功能僅能稍 微減J/與抑制啟動電流，且此種限流功能僅能保護該風扇2内部 之半導體元件與線圈，但對於應用的設備或電路來說，限流功能 仍不足以降低(啟動電流。 因此’如何提供一種風扇控制裝置’避免上述問題之發生及 文善上述之缺點’實為-重要的課題。 3 2010年5月日修正 【發明内容】 · · ~-- 有鑑於上述課題，本發明之目的為提供—觀扇控制裝置， 其係可降低風扇啟動或重設時之啟動電流。 緣是’為達上述目的，依據本發明之—種風扇控制裝置係依 據-控制訊號來控制-風扇，該裝置包括—訊號輸入單元、一啟 動保護單元以及-驅動單元。該訊號輸入單元係接收該控制訊 號；該啟祕護單元錄出-保護纖，並於_段綱之後停止 輸出該保護訊號；該驅動單元係輕接至該啟動保護單元與該訊號 輸入單元以接收該保護訊號與該控制訊號，該保護訊號係抑制該 驅動單元於該段期間内驅動該風扇之電流，該控制訊號係控制該 驅動單元於該段期間後驅動該風扇。 承上所述，因依據本發明之風扇控制裝置，其係輸出保護訊 號來強迫控制驅動單元避免驅動風扇，因而可減少風扇或風扇控 制裝置於啟動或重置時的啟動電流。 【實施方式】 以下將參照相關圖式’說明依據本發明較佳實施例之一種風 扇控制裝置。 請參照第3圖所示’依據本發明較佳實施例之一風扇控制裝 置3係依據一控制訊號Scnt來控制一風扇4，該裝置包括一訊號 輸入單元31、一啟動保護單元32以及一驅動單元33。 一電源訊號Vcc係驅動該驅動單元33作動，一電源訊號Vref 1335721 I ί · 2010年5月π日修正 ， 係驅動該訊號輸入單元31與該啟動保護單元32作動。 ' 該訊號輸入單元31係接收該控制訊號Scnt，該訊號輸入單元 31係提供穩定的工作點以使該控制訊號SCNT得以正常地輸入至該 驅動單元33。 當該風扇控制裝置3啟動或重設時，該啟動保護單元32係輸 出一保濩訊號SPROT，並於一段期間之後停止輸出該保護訊號 • SpR〇T 5 該驅動單元33係耦接至該啟動保護單元32與該訊號輸入 單元31以接收該保護訊號SpR〇T與該控制訊號Scnt。該保護訊號 Spr〇t係抑制該驅動單元33於該段期間内驅動該風扇4之電流， 該控制訊號SCNT係控制該驅動單元33於該段期間後驅動該風扇 4 〇 該保護訊號SPROT與該控制訊號sCNT的線路係共同耦接至該 驅動單元33的訊號輸入端，該驅動單元33的訊號輸入端之位準 φ 係設定為與該風扇4之轉速成反比，為了在該風扇控制裝置3啟 動或重設時避免該驅動單元33產生過大的啟動電流來驅動該風扇 4 ’該保§蔓訊號係可設為南位準來輸入至該驅動電路，藉以強迫該 驅動電路輸出極低的電流來驅動該風扇4,使得該風扇4不轉動或 、 是以極低的轉速運作。 當該段期間之後該風扇控制裝置3於穩態運轉時，其係依據 該控制訊號Scnt之位準來控制該風扇4之轉速，該控制訊號Scnt 之位準係與該風扇4之轉速成反比。 5 1335721 ' . I--- 2010年5月日修正 在本實把例中’為了獲得較佳的控制效果，在該段期間内該 保護訊號SpR〇T係先防止該驅動單it 33縣該風扇4，之後再控 .制該驅動單元％驅動該風扇4維持低轉速，使得該風扇4之轉速 可以逐漸增加，於該段期間之後便可順利地進入穩態運作。也就 是說，在該段期間内該保護訊號SpR〇T係先為高位準並逐漸變為中 位準，並以該保護訊號SPROT來控制該驅動單元33，在該段期間 • 之後係改以該控制訊號Scnt來控制該驅動單元33，該風扇4之轉 速係控制於該控制訊號SCNT所對應的轉速。 如此一來，驅動該風扇4的電流波形係如第4圖所示，明顯 的，驅動電流於該風扇控制裝置3啟動或重設之初的啟動電流係 趨近於0，因而啟動電流可有效地受到壓抑。 在本實施例中，為了達到瞬間輸出高位準的保護訊號SpR〇T， 該啟動保護單元32包括一第一電容器，該第一電容器係具有一第 鲁 端與-第一端’該第-端係接收該電源訊號，該第二端係福接 該驅動單元33，該電源訊號之瞬間能量係使該第一電容器短路以 在該第二端輸出高位準的該保護訊號SpR〇T至該驅動單元％。因 此，不論該風扇控制装置3於啟動或重置時皆可確保輸入至該驅 . 動單元33的訊號為高位準。 另外，該驅動單元33包括一數位類比轉換電路（圖未示）以 及一類比驅動電路（圖未示），該數位類比轉換電路係耦接至該啟 動保護單元32與該訊號輸入單元31，以將該控制訊號Scw與該 6 1335721 » · 2010年5月〇日修正 » 保護訊號SPR0T由數位轉換為類比。該類比驅動電路係耗接至該數 • 位類比轉換電路’該保護訊號SPR0T係抑制該類比驅動單元於該段 期間内驅動該風扇4之電流，該控制訊號Scnt係控制該類比驅動 單元於該段期間後驅動該風扇4。 另外’請再參照第3圖所示，該風扇控制裝置3更包括一訊 號重置單元34以及一電源重置單元35。 φ 該訊號重置單元34係耦接至該啟動保護單元32,並偵測一重 置控制訊號Sreset以輸出一重置訊號Srst s來控制該啟動保護單 元32輸出該保護訊號。 該電源重置單元35係耦接至該啟動保護單元32,並偵測該電 源訊號Vref是否重置以輸出一重置訊號sRST p來控制該啟動保護 單元32輸出該保護訊號sPRQT。 於本實施例中，該訊號重置單元34係於該風扇4之扇葉被強 • 迫停止時而致能（enable)，而電源重置單元35則係於該風扇4、 風扇控制裝置3或其他相關單元熱插拔時而致能。 如第5圖所示，係揭露該風扇控制裝置3之電路圖。該訊號 輸入單兀31係包括一第十--第十四電阻器R„〜Rm、一第五開 •關SW5 ’該第十二〜第十四電阻器R12〜R14係與該電源訊號Vr£f 構成一輸入偏壓電路以接收該控制訊號Scnt，該控制訊號Scnt係 輸入至該第五開關SW5’該第十一電阻器Rn係作為負載以穩定地 傳送出該控制訊號Scnt。 7 1335721 2010年5月Θ日修正 . 織動保護單元32包括-第-電阻器Rl、-第一電容器Q、 ' —緩啟動控制電路321、一低速控制電路322以及-隔離電路323。 -電源訊號、係輸人至該第—電阻器&，該第一電容器 Q係具有-第-端與-第二端’該第一端係連接至該第一電阻器 R!以接收該電源訊號Vref ’該第二端_接該驅動單元33，該電 源訊號Vref之瞬間能量係使該第一電容扣短路以在該第二端輸 鲁 出尚位準的該保護訊號SpROT至該驅動單元33。 該緩啟動控制電路321係輕接於該第一電容器Ci之該第一 端，並控繼帛-電sn Cl停玲岐辦_倾訊號SpR〇T。 該緩啟動控制電路321包括-緩啟動開關SW6以及一重置缓 衝電路BUF1。該緩啟動開關％之一端係麵接該第一電容器c] 之該第-端，另-端係祕—接地端。該重置緩衝電路腳1之一 端係祕該緩啟動開關SW6並經由一第十電阻器Ri〇接收該電源 • 訊號Vref另端係耦接該接地端，其係控制該緩啟動開關sW6 以導通該第-電容H Q該第—端與該接地端之路徑，俾使該第一 電容器Q停止雜高鱗賴賴訊號SpROT。 該低速控制電路322係與該緩啟動控制電路321及該驅動單 元33輕接’以輸出中位準的保護訊號SPROT至該驅動單元33。 該低速控制電路322包括一第二電阻器R2以及-低速控制開 關SI ’該第二電阻器心係作為一分壓元件，其係搞接該驅動電 從第一電阻器R3接收一電源訊號VlN ;該低速控制開關 8 1335721 » . 2010年5月/*J日修正 * SW4係耗接於該第二電阻器R2與該接地端之間，該緩啟動開關 •. SW6係控制該低速控制開關SW4以導通該第二電阻器r2與該接地 端之路徑’以在該段期間之後於該第二電阻器&輸出中位準的保 護訊號SPROT至該驅動單元33。 該隔離電路323係耦接於該緩啟動控制電路321與該驅動電 路33之間’係防止該控制訊號Scnt與該緩啟動控制電路321互相 φ 干擾。 該隔離電路323係包括一第一開關SW〗、一第二開關SW2、 一第八電阻器Re及一第九電阻器&，該緩啟動控制電路321係控 制該第二開關SW2導通該第九電阻器&與該接地端之路徑，該第 二開關SW2係控制該第一開關SWl導通該第八電阻器R8與該接 地端之路徑，該第八電阻器r8係耦接至該驅動電路33 ^ 另外，為了確保前後級電路的穩定度，在該啟動保護單元32 鲁更包括一逆電流保護電路324 ’該逆電流保護電路324係搞接於該 緩啟動控制電路321與該驅動電路33之間，其係包括一二極體1335721 ___ 1 t Mayday revision of May 2010 ' _ • VI. Description of the invention: - Technical field of the invention The present invention relates to a control device, and more particularly to a fan control device. [Prior Art] Fan systems have been commonly used in today's electronic devices to provide a mechanism for heat dissipation or diversion. As shown in Fig. 1, the conventional fan control device 1 receives a control signal Scnt to control the rotational speed of the fan 2. The fan control device 1 includes an input circuit η and a driving circuit 12, the input circuit 11 receives the control signal SCNT, and the input circuit 11 provides a stable operating point for the control signal SCNT to be correctly input to the The driving circuit 12' controls the rotation speed of the fan 2 according to the control signal sCNT. However, when starting or resetting, the fan 2 or the fan control device 1 inevitably generates a starting current as shown in FIG. 2, and the starting current will be even for the fan 2 or the fan control device. The applied device or circuit causes a current overload. Although a current limiting function can be added to the driving circuit 12, the current limiting function can only slightly reduce the J/ and suppress the starting current, and the current limiting function can only protect the semiconductor components and coils inside the fan 2, but for the application. In terms of equipment or circuits, the current limiting function is still not enough to reduce (starting current. Therefore, 'how to provide a fan control device' to avoid the above problems and the above shortcomings of Wenshan' is a real-important topic. 3 2010 5 REDUCTION MODIFICATION [SUMMARY OF THE INVENTION] In view of the above problems, an object of the present invention is to provide a viewing fan control device which can reduce the starting current when the fan is started or reset. According to the present invention, a fan control device controls a fan according to a control signal, the device includes a signal input unit, a start protection unit and a drive unit. The signal input unit receives the control signal; The protection unit records the protection fiber and stops outputting the protection signal after the segment; the drive unit is lightly connected to the activation protection unit and the signal input list Receiving the protection signal and the control signal, the protection signal suppresses the current of the driving unit driving the fan during the period, and the control signal controls the driving unit to drive the fan after the period. According to the fan control device of the present invention, the output protection signal is forcibly controlling the driving unit to avoid driving the fan, thereby reducing the starting current of the fan or the fan control device when starting or resetting. [Embodiment] FIG. 4 illustrates a fan control device according to a preferred embodiment of the present invention. Referring to FIG. 3, a fan control device 3 according to a preferred embodiment of the present invention controls a fan 4 according to a control signal Scnt. The device includes a signal input unit 31, a start protection unit 32 and a drive unit 33. A power signal Vcc drives the drive unit 33 to operate, a power signal Vref 1335721 I ί · May π, 2010 correction, the driver The signal input unit 31 and the activation protection unit 32 operate. The signal input unit 31 receives the control signal Scnt. The signal input unit 31 provides a stable operating point for the control signal SCNT to be normally input to the driving unit 33. When the fan control device 3 is activated or reset, the startup protection unit 32 outputs a protection signal. SPROT, and after a period of time, the output of the protection signal is stopped. SpR〇T 5 The driving unit 33 is coupled to the activation protection unit 32 and the signal input unit 31 to receive the protection signal SpR〇T and the control signal Scnt. The protection signal Spr〇t suppresses the current of the driving unit 33 to drive the fan 4 during the period. The control signal SCNT controls the driving unit 33 to drive the fan 4 after the period of the protection signal SPROT and the The circuit of the control signal sCNT is coupled to the signal input end of the driving unit 33. The level φ of the signal input end of the driving unit 33 is set to be inversely proportional to the rotational speed of the fan 4, in order to be in the fan control device 3. When the startup or resetting, the driving unit 33 is prevented from generating an excessive starting current to drive the fan 4'. The protection signal can be set to the south level to be input to the driving circuit. Thereby driving circuit outputs the low current forced to drive the fan 4 so that the fan does not rotate or 4, the operating speed is low. When the fan control device 3 is in steady state operation after the period, it controls the rotation speed of the fan 4 according to the level of the control signal Scnt. The level of the control signal Scnt is inversely proportional to the rotation speed of the fan 4. . 5 1335721 ' . I--- May 2010 revised in the actual example of 'in order to obtain better control effect, during the period of the protection signal SpR〇T is the first to prevent the drive single it 33 counties The fan 4 is then controlled. The drive unit % drives the fan 4 to maintain a low rotation speed, so that the rotation speed of the fan 4 can be gradually increased, and the steady state operation can be smoothly entered after the period. That is to say, during the period of time, the protection signal SpR〇T is first high level and gradually becomes the middle level, and the driving unit 33 is controlled by the protection signal SPROT, during which time The control signal Scnt controls the driving unit 33, and the rotation speed of the fan 4 is controlled by the rotation speed corresponding to the control signal SCNT. As a result, the current waveform of the fan 4 is as shown in FIG. 4. Obviously, the starting current of the driving current at the start or reset of the fan control device 3 approaches 0, so the starting current can be effective. The ground is suppressed. In this embodiment, in order to instantaneously output a high level of protection signal SpR 〇T, the startup protection unit 32 includes a first capacitor having a second end and a first end 'the first end Receiving the power signal, the second end is connected to the driving unit 33, and the instantaneous energy of the power signal shorts the first capacitor to output the high level of the protection signal SpR〇T to the driving at the second end. unit%. Therefore, regardless of whether the fan control unit 3 is activated or reset, the signal input to the drive unit 33 is ensured to be at a high level. In addition, the driving unit 33 includes a digital analog conversion circuit (not shown) and an analog driving circuit (not shown). The digital analog conversion circuit is coupled to the startup protection unit 32 and the signal input unit 31 to The control signal Scw and the 6 1335721 » · May 2010 correction » protection signal SPR0T are converted from digital to analog. The analog drive circuit is connected to the digital analog conversion circuit. The protection signal SPR0T suppresses the current of the analog drive unit driving the fan 4 during the period. The control signal Scnt controls the analog drive unit. The fan 4 is driven after the segment period. In addition, please refer to FIG. 3 again, the fan control device 3 further includes a signal reset unit 34 and a power reset unit 35. The signal resetting unit 34 is coupled to the activation protection unit 32 and detects a reset control signal Sreset to output a reset signal Srst s to control the startup protection unit 32 to output the protection signal. The power-reset unit 35 is coupled to the activation protection unit 32 and detects whether the power signal Vref is reset to output a reset signal sRST p to control the startup protection unit 32 to output the protection signal sPRQT. In this embodiment, the signal resetting unit 34 is enabled when the fan blade of the fan 4 is forced to stop, and the power reset unit 35 is attached to the fan 4 and the fan control device 3. Or other related units are enabled when hot plugging. As shown in Fig. 5, a circuit diagram of the fan control unit 3 is disclosed. The signal input unit 31 includes a tenth-fourth resistor R„~Rm, a fifth open/close SW5', and the twelfth to fourteenth resistors R12~R14 are connected to the power signal Vr. £f constitutes an input bias circuit for receiving the control signal Scnt, and the control signal Scnt is input to the fifth switch SW5'. The eleventh resistor Rn acts as a load to stably transmit the control signal Scnt. 1335721 Modified on May 30, 2010. The weaving protection unit 32 includes a -th resistor R1, a first capacitor Q, a - a slow start control circuit 321, a low speed control circuit 322, and an isolation circuit 323. - Power signal And inputting the first to the first resistor Q, the first capacitor Q has a first end and a second end, the first end is connected to the first resistor R! to receive the power signal Vref The second terminal is connected to the driving unit 33, and the instantaneous energy of the power signal Vref is short-circuited to the second terminal to output the protection signal SpROT which is still in position to the driving unit 33. The slow start control circuit 321 is lightly connected to the first end of the first capacitor Ci, and is controlled The slow start control circuit 321 includes a slow start switch SW6 and a reset buffer circuit BUF1. One of the slow start switch % end faces is connected to the first The first end of the capacitor c] is connected to the ground end. The one end of the reset buffer circuit pin 1 is connected to the slow start switch SW6 and receives the power supply via the tenth resistor Ri〇. The other end is coupled to the grounding end, and the slow start switch sW6 is controlled to turn on the path of the first end of the first capacitor HQ and the ground end, so that the first capacitor Q stops the high-frequency tracking signal SpROT The low speed control circuit 322 is connected to the slow start control circuit 321 and the driving unit 33 to output a medium level protection signal SPROT to the driving unit 33. The low speed control circuit 322 includes a second resistor R2 and - low speed control switch SI 'the second resistor core acts as a voltage dividing component, which receives the driving power from the first resistor R3 to receive a power signal VlN; the low speed control switch 8 1335721 » . May 2010 /*J day correction* SW4 system is connected to the second resistor R Between the ground terminal and the ground terminal, the slow start switch • SW6 controls the low speed control switch SW4 to turn on the path of the second resistor r2 and the ground end to be in the second resistor & The protection signal SPROT of the intermediate level is outputted to the driving unit 33. The isolation circuit 323 is coupled between the slow start control circuit 321 and the driving circuit 33 to prevent the control signal Scnt and the slow start control circuit 321 Interference with each other φ. The isolation circuit 323 includes a first switch SW, a second switch SW2, an eighth resistor Re, and a ninth resistor & the slow start control circuit 321 controls the second switch SW2 to turn on the first a path of the nine resistors and the grounding end, the second switch SW2 controls the first switch SW1 to conduct a path of the eighth resistor R8 and the ground, and the eighth resistor r8 is coupled to the driving In addition, in order to ensure the stability of the front and rear stage circuits, the start protection unit 32 includes a reverse current protection circuit 324. The reverse current protection circuit 324 is coupled to the slow start control circuit 321 and the drive circuit. Between 33, the system includes a diode
Dl ' —第三_ SW3 ’該二極體A係祕於該訊號輸入單元31 與該驅動電路33之間’該第三開關SW3係受控於該缓啟動控制電 . 路321以導通該二極體D!與該接地端之路徑。 ' 該重置緩衝電路BUF1係包括-第四電阻器R4與-第二電容 器C：2 ’於該風扇控制展置3啟動或重置時，該電源訊號V肪F會對 該第—電各器C2充電’使得該緩啟動開關SW6與該第-開關SW, 9 1335721 * t 2010年5月/?曰修正 . 關閉，而該第二開關SW2與該低速控制開關SW4係導通，該中位 • 準的該保護訊號SPR〇T係經由該第三電阻器&及該第二電阻器馬 將該電源訊號Vin分壓輸入至該驅動電路33。 該第二電容器Q與該第十電阻器R】〇的時間常數係可決定該 保護訊號SPROT維持在中位準之時間。當該第二電容器&充電達 到穩態之後，則該緩啟動開關sw0係關閉該低速控制開關§w4、 φ 該逆電流保護電路324之該第三開關SW3及該隔離電路323之該 第二開關sw2，因而該第一開關SWi係導通該第八電阻器私與該 接地端之路徑，使得該等第三、第八電阻器R3、Rs得以作為該控 制訊號Scnt輸入至該驅動單元33的偏壓電路。該控制訊號‘ 係可控制該驅動單元33來驅動該風扇4的轉速。 該訊號重置單元34係具有一訊號重置開關SW7,以及-第十 五電阻器R】5’該第十五電阻器R]5係接收該電源訊號V旺f並搞接 _該訊號重置開關SW7之一控制端，該訊號重置開關SW7之-端係 耦接^重置緩衝電路BUFi，另一端係耗接該接地端。於本實施例 中田該風扇4之扇葉被強迫停止時，該重置控制訊號S咖^ 控繼訊號重置開關sw>7導通該重置緩衝電路與該接地端 之路仅並輪出一重置峨Srst_s至該緩啟動開㈤SW6來控綱 啟祕護單元32輸&雜護峨s_。 5電原重置單元35係具有一延遲緩衝電路则^與一電源重 ’ Ws該電源重置開關娜之一端係耗接該重置緩衝電路 1335721 • t Γ ...... 一 — 2010年5月η日修正 • BUFl ’另—端係耦接該接地端》於本實施例中，當該風扇4在插 .. 拔之後’該延遲緩衝電路BUF2係緩衝該電源訊號VreF控制該電 源重置開關SW8導通該重置緩衝電路BUF】與該接地端之路徑， 並輸出一重置訊號Sret p至該緩啟動開關SW6來控制該啟動保護 單元32輪出該保護訊號SPROT。 該延遲緩衝電路BUF2係包括一第五、第六、第七電阻器 • R5〜R7、一第三電容器q與一開關SW9，該電源訊號Vref係輸入 至該第五電阻器Rs及該第六電阻器心，該第六電阻器R6、該第 七電阻器R7與該第三電容器q之一端係共同耦接至該開關Sw9 以控制該電源重置開關SW8。 當該風扇控制裝置3啟動或重置時，該開關SW9的導通會因 該第六電阻器與該第三電容器C3的充電時間而延遲，該電源訊 號VreF係控制該開關SWS導通該緩啟動開關SW6與該接地端之路 • 徑’並將該第二電容器C2的儲能瞬間釋放，使得該緩啟動開關sw6 關閉以控制該保護訊號sPROT於中位準。 經過該第六電阻器R6與該第三電容器C3的充電時間之後，該 開關SW9導通且該電源重置開關SWg關閉，因此該第四電阻器 • 心與該第二電容器a開始充電’但是該缓啟動開關SW6仍維持在 關閉因而維持該保護訊號SpR〇T於中位準。 當該風扇4正常運作時，該重置控制訊號Sreset為低位準並 控制該訊號重置開關SW?關閉；但當該風扇4的轉子發生鎖住情 1335721 I ί ---- I - 2010年5月/1日修正 況時’此時該重置控制訊號Sreset係為高彳立準，並控制該訊號重 ·. 置開關SW?導通’並使該第二電容器C2之儲能瞬間釋放以關閉該 緩啟動開關SW6 〇 在本實施例中，這些開關SWfSW9係可用雙極接合型電晶體 (BJT)或金氧半場效電晶體（MOSFET)來實現，以金氧半場效 電晶體實現來說’這些開關SW^SW9的閘極係作為控制開關作動 Φ 的輸入端’汲極與源極係作為被控制要導通的兩端。 該風扇控制裝置3之優點在於可使用開關、電晶體、電容器、 與電阻器等小型且低價元件來實現，除了可調整電阻值來改變低 轉速的運轉控制之外，並可藉由電容器來實現緩啟動與正常運轉 控制。此外’外部輸入的控制訊號無法影響保護訊號的作動，藉 此可確保風扇控制裝置於穩態之後才控制風扇作動。 綜上所述，本發明之風扇控制裝置係輸出保護訊號來強迫控 • 制驅動單元避免驅動風扇，因而可減少風扇或風扇控制裝置於啟 動或重置時的啟動電流。 以上所述僅為舉例性，而非為限制性者。任何未脫離本發明 之精神與範疇，而對其進行之等效修改或變更，均應包含於後附 . 之申請專利範圍中。 【圖式簡單說明】 第1圖為一種習用風扇控制裝置之示意圖； 第2圖為第1圖中驅動風扇之電流波形圖； 2010年5月/了日修正 第3圖為傾树雜佳實關之—觀驗制裝 置之示意圖； 第4圖為第3@巾驅動風扇之電流波糊；以及 第5圖為第3 ®之風扇控制裝置之電路圖。 【主要元件符號說明】 1 風扇控制裝置 12 驅動電路 3 風扇控制裝置 32 啟動保護單元 322 低速控制電路 324 逆電流保護電路 34 訊號重置單元 4 風扇 BUF! 重置緩衝電路 C广c3 第一〜第三電容器 Rl~Rl5 第一〜第十五電阻器 sw4 低速控制開關 sw6 緩啟動開關 sw8 電源重置開關 S〇NT 控制訊號 Sreset 重置控制訊號 11 輸入電路 2 風扇 31 訊號輸入單元 321 緩啟動控制電路 323 隔離電路 33 驅動單元 35 電源重置單元 buf2 延遲缓衝電路 D, 二極體 SW广 SW3 第·—第三開關 sw5 第五開關 sw7 訊號重置開關 sw9 開關 SpROT 保護訊號 1335721 2010年5月/?日修正Dl ' - third_SW3 'the diode A is secret between the signal input unit 31 and the driving circuit 33. The third switch SW3 is controlled by the slow start control circuit. The circuit 321 is turned on. The path of the body D! and the ground. The reset buffer circuit BUF1 includes a fourth resistor R4 and a second capacitor C: 2'. When the fan control extension 3 is activated or reset, the power signal V fat F will be used for the first The device C2 is charged 'to make the slow start switch SW6 and the first switch SW, 9 1335721 * t May 2010 /? 曰 correction. Close, and the second switch SW2 is turned on with the low speed control switch SW4, the middle position The predetermined protection signal SPR〇T is divided into the driving circuit 33 via the third resistor & and the second resistor horse. The time constant of the second capacitor Q and the tenth resistor R 〇 determines the time during which the protection signal SPROT is maintained at the middle level. After the second capacitor & charge reaches a steady state, the slow start switch sw0 turns off the low speed control switch §w4, φ the third switch SW3 of the reverse current protection circuit 324 and the second of the isolation circuit 323 The switch sw2, so that the first switch SWi turns on the path of the eighth resistor and the ground, so that the third and eighth resistors R3 and Rs are input to the driving unit 33 as the control signal Scnt. Bias circuit. The control signal ‘ can control the driving unit 33 to drive the rotational speed of the fan 4. The signal resetting unit 34 has a signal reset switch SW7, and a fifteenth resistor R] 5'. The fifteenth resistor R] 5 receives the power signal V and f receives the signal. The control terminal of one of the switches SW7 is coupled to the reset buffer circuit BUFi at the end of the signal reset switch SW7, and the other end is connected to the ground terminal. In the embodiment, when the fan blade of the fan 4 is forcibly stopped, the reset control signal S is controlled by the signal reset switch sw>7, and the circuit of the reset buffer circuit and the ground terminal is only rotated one by one. Reset 峨Srst_s to the slow start (5) SW6 to control the secret protection unit 32 to lose & 峨 峨 s_. The 5th power resetting unit 35 has a delay buffer circuit and is connected to a power supply. The power supply reset switch is connected to the reset buffer circuit 1353721. • t Γ ...... —— 2010 In May, the η-day correction is performed. • In the present embodiment, when the fan 4 is plugged in. The delay buffer circuit BUF2 buffers the power signal VreF to control the power supply. The reset switch SW8 turns on the path of the reset buffer circuit BUF and the ground, and outputs a reset signal Sret p to the slow start switch SW6 to control the start protection unit 32 to rotate the protection signal SPROT. The delay buffer circuit BUF2 includes a fifth, sixth, and seventh resistors R5 to R7, a third capacitor q, and a switch SW9. The power signal Vref is input to the fifth resistor Rs and the sixth The resistor core, the sixth resistor R6, the seventh resistor R7 and one end of the third capacitor q are commonly coupled to the switch Sw9 to control the power reset switch SW8. When the fan control device 3 is activated or reset, the conduction of the switch SW9 is delayed due to the charging time of the sixth resistor and the third capacitor C3, and the power signal VreF controls the switch SWS to turn on the slow start switch. The path of the SW6 and the ground terminal and the energy storage of the second capacitor C2 are instantaneously released, so that the slow start switch sw6 is turned off to control the protection signal sPROT at the middle level. After the charging time of the sixth resistor R6 and the third capacitor C3, the switch SW9 is turned on and the power reset switch SWg is turned off, so the fourth resistor and the second capacitor a start charging. The slow start switch SW6 is still kept off and thus maintains the protection signal SpR〇T at the middle level. When the fan 4 is operating normally, the reset control signal Sreset is at a low level and the signal reset switch SW is controlled to be turned off; but when the rotor of the fan 4 is locked, the number 1357721 I ί ---- I - 2010 At the time of the correction on May/1, 'the reset control signal Sreset is at a high level, and the signal is controlled to be reset. The switch SW is turned on' and the storage of the second capacitor C2 is instantaneously released to close the The slow start switch SW6 〇 In the present embodiment, these switches SWfSW9 can be realized by a bipolar junction type transistor (BJT) or a gold oxide half field effect transistor (MOSFET), which is realized by a gold oxide half field effect transistor. The gate of the switch SW^SW9 serves as the input terminal of the control switch actuation Φ, the drain and the source are the two ends to be controlled to be turned on. The fan control device 3 has the advantages that it can be realized by using small and low-cost components such as switches, transistors, capacitors, and resistors, in addition to adjusting the resistance value to change the operation control of the low rotation speed, and by means of a capacitor Achieve slow start and normal operation control. In addition, the externally input control signal does not affect the operation of the protection signal, thereby ensuring that the fan control unit controls the fan operation after steady state. In summary, the fan control device of the present invention outputs a protection signal to force the drive unit to avoid driving the fan, thereby reducing the starting current of the fan or fan control device when it is started or reset. The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of a conventional fan control device; Fig. 2 is a current waveform diagram of a driving fan in Fig. 1; May 2010/day revised Fig. 3 is a good tree Guan Zhi - Schematic diagram of the inspection device; Figure 4 is the current wave paste of the 3 @ towel drive fan; and Figure 5 is the circuit diagram of the 3 3 fan control device. [Main component symbol description] 1 Fan control device 12 Drive circuit 3 Fan control device 32 Start protection unit 322 Low speed control circuit 324 Reverse current protection circuit 34 Signal reset unit 4 Fan BUF! Reset buffer circuit C wide c3 First to Three capacitors Rl~Rl5 First to fifteenth resistor sw4 Low speed control switch sw6 Slow start switch sw8 Power reset switch S〇NT Control signal Sreset Reset control signal 11 Input circuit 2 Fan 31 Signal input unit 321 Slow start control circuit 323 isolation circuit 33 drive unit 35 power supply reset unit buf2 delay buffer circuit D, diode SW wide SW3 first - third switch sw5 fifth switch sw7 signal reset switch sw9 switch SpROT protection signal 1357721 May 2010 / Day correction
SrsT_S、SrsT_P 重置訊號 Vcc、Vin、Vref電源訊號SrsT_S, SrsT_P reset signal Vcc, Vin, Vref power signal