1279071 九、發明說明： 【發明所屬之技術領域】 於一 本發明係關於一種風扇系統及其控制裝置 種以較低轉速啟動之風扇“及其㈣裝 ’特別關 置。 【先前技術】 n ’電子系、统都具有―風扇系統作為散熱之 •用，曰並且該風扇系統具有-控制裳置以及至少一風扇， 以提供忒電子系統藉由該控制裝置控制該風扇之轉 速，使得該風扇系統之該風射配合該電子线之實際 運轉狀況而調整該風扇之轉速。舉例而言，當該風扇系 ^應用於外部系統且該外部系統之處理器使用比例 咼時，其所產生的熱量相對較高，此時該外部系統則可 透過該控制裝置以調高該風扇之轉速，以符合散熱需 求。反之，當處理器處於閒置狀態時，則該風扇之轉速 • 即可相對降低，以達到節能省電之功效。 請參閱圖1所示，為一種習知風扇系統之控制裝置 10與一外部系統1共同作動之一示意圖。該控制裝置 1〇係包括一轉速控制單元η以及一驅動單元ι2，該驅 動單元12係可為一驅動晶片。該轉速控制單元u具有 一電源端及一信號輸入端。該電源端係連接一外部之電 壓源V以作為電源，而該信號輸入端接收該外部系統1 所發出之一目標轉速控制信號101，並且依據該目標轉 速控制信號101以產生一轉速控制信號102。該驅動單 1279071 •元12係依據該轉速控制㈣1G2控制—Μ i3的轉 速。 _ 該控制裝置1G於剛啟動時，無法及時送出該轉速 控制信號1G2,造成該風扇13會以最高轉速運轉，而 '產生啟動電流過大之情況。此外，當排除該風扇13之 故障情況後（例如該風扇13被異物卡住），該控制裝置 10重新啟動時’亦無法及時送出該轉速控制信號⑽， 鲁故使該風扇13以最高轉速運轉，而產生啟動電流過大 之情況’上述之兩種情況都將造成客戶系統端無謂的能 源浪費及該風扇在高速運轉下所發生溫升之問題。 因此，如何提供一種風扇系統及其控制裝置於該風 扇啟動或重新啟動時，以較低轉速啟動，以解決上述問 題0 【發明内容】 * 有鑑於上述課題，本發明之目的為提供一種於啟動 或重新啟動時，以較低轉速啟動之風扇系統及其控制裝 置。 緣是，為達上述目的，依據本發明之一種風扇系統 之控制裝置係接收一啟始電壓及一警示信號，該風扇系 統具有至少一風扇，該控制裝置包括一啟動控制單元以 及一驅動單元。當接收該啟始電壓時，該啟動控制單元 產生一啟動控制信號且經過一預定時間後，停止送出該 啟動控制信號，·而當接收該啟始電壓及該警示信號時， 1279071 為達上述目依據本發明之一種風扇系統係接收 、啟始電壓及—警不信號，該風扇系統包括至少一風扇 以及ί制裝置。該控制裝置係包括-啟動控制單元及 -驅動早7C ’該驅動單元分別與該啟動控制單元及該風 扇電性連接；當該啟動控制單元接收該啟始電壓時，該 啟動控制單元產生一啟動控制信號且經過一預定時間 後j停止送出該啟動控制信號；而當接收該啟始電壓及 該警示信號時，該啟動控制單元產生該啟動控制信號； 该驅動單兀接收且依據該啟動控制信號，控制該風扇之 轉速。1279071 IX. Description of the Invention: [Technical Field] The invention relates to a fan system and a control device thereof, which are started at a lower rotational speed, and the fan (and its (4) device' is specially closed. [Prior Art] n ' The electronic system has a "fan system" for heat dissipation, and the fan system has a control skirt and at least one fan to provide a power system for controlling the speed of the fan by the control device, so that the fan system The wind beam adjusts the rotational speed of the fan according to the actual operating condition of the electronic wire. For example, when the fan system is applied to an external system and the processor of the external system uses a ratio 咼, the heat generated by the fan is relatively Higher, at this time, the external system can use the control device to increase the speed of the fan to meet the heat dissipation requirement. Conversely, when the processor is in an idle state, the speed of the fan can be relatively reduced to achieve The function of energy saving and power saving. Referring to FIG. 1 , a control device 10 of a conventional fan system is operated together with an external system 1 . The control device 1 includes a speed control unit η and a driving unit ι2, and the driving unit 12 can be a driving chip. The speed control unit u has a power terminal and a signal input terminal. An external voltage source V is connected as a power source, and the signal input terminal receives a target speed control signal 101 sent by the external system 1, and generates a speed control signal 102 according to the target speed control signal 101. The drive list 1279071 • Element 12 is controlled according to the speed (4) 1G2 control - Μ i3 speed. _ When the control device 1G is just started, the speed control signal 1G2 cannot be sent in time, causing the fan 13 to run at the highest speed, and 'generate the start In addition, when the fault condition of the fan 13 is excluded (for example, the fan 13 is stuck by a foreign object), when the control device 10 is restarted, the speed control signal (10) cannot be sent in time, so that the fan is eliminated. 13 running at the highest speed, and the situation of excessive starting current is generated. 'The above two situations will cause the client system to be unnecessary. Energy waste and the temperature rise of the fan at high speed. Therefore, how to provide a fan system and its control device to start at a lower speed when the fan is started or restarted to solve the above problem 0 [Summary of the Invention] In view of the above problems, an object of the present invention is to provide a fan system and a control device thereof that are activated at a lower rotational speed when starting or restarting. The edge is that, in order to achieve the above object, a fan system according to the present invention The control device receives a start voltage and a warning signal, the fan system has at least one fan, the control device includes a start control unit and a drive unit. When receiving the start voltage, the start control unit generates a start control After the signal has passed a predetermined time, the start control signal is stopped, and when the start voltage and the warning signal are received, 1279071 is a fan system according to the present invention, which receives, starts voltage and alarms. Without signal, the fan system includes at least one fan and a device. The control device includes a start control unit and a drive 7C. The drive unit is electrically connected to the start control unit and the fan respectively. When the start control unit receives the start voltage, the start control unit generates a start. Controlling the signal and stopping sending the start control signal after a predetermined time; and when receiving the start voltage and the warning signal, the start control unit generates the start control signal; the drive unit receives and according to the start control signal , control the speed of the fan.
該啟動控制單元產生該啟動 · — 別與該啟動控制單元ΒπΓΓ 搞動早疋係分 早及忒風扇電性連接，接收且依據該 啟動控制信號，控制該風扇之轉速。 承上所述，因依本發明之一種風扇系統及其控制裝 置係藉由該啟動控制單元，控制該風扇於啟動或重新啟 動時，以較低轉速啟動。與習知技術相較，本發明能夠 解決啟動電流過大之問題，避免該風扇之元件損壞或因 轉速過快造成溫升。 【實施方式】 以下將參相關圖式，說明依據本發明較佳實施例 之一種風扇系統及其控制裝置。 請參閱圖2所示’為本發明較佳實施例之一種風扇 系統之控制裝置20係可與一外部系統2配合使用，且 1279071 該風扇系統具有至少一風扇3。該控制裝置2〇係接收 啟始電壓91及一警示信號％。其中，該啟始電壓9 j 係由一外部之電壓源V所提供，該控制裝置2〇接收該 啟始電壓91後即開始作動。該控制裝置20係包括一啟 ， 動控制單元21、一驅動單元22以及一轉速控制單元23。 當接收該啟始電壓91時，該啟動控制單元2丨產生 一啟動控制信號93，本實施例之該啟動控制信號93可 修為一高電位信號，並且經過一預定時間後，該啟動控制 單元21停止送出該啟動控制信號93。而當接收該啟始 電壓91及該警示信號92時，該啟動控制單元21產生 該啟動控制信號93至該驅動單元22。 該驅動單元22分別與該啟動控制單元21及該風扇 3電性連接，接收且依據該啟動控制信號93控制該風 扇3之轉速。於本實施例中，該驅動單元22係可具有 一信號輸入端Vth及一半速信號輸入端RMI。該信號輸 • 入端Vth與该啟動控制早元21電性連接以接收該啟動 控制信號93 ’並且依據該啟動控制信號93控制該風扇 3之轉速。 該轉速控制單元23係接收該啟始電壓91，且依據 該啟始電壓91及一目標轉速控制信號94，而產生一轉 速控制信號95及/或一半速控制信號96至該驅動單元 22。其中，該目標轉速控制信號94係由該外部系統2 所提供之一脈衝寬度調變（Pulse Width Modulation， PWM )信號。此外，該轉速控制單元23將該半速控制 1279071 # ί虎96送至該驅動單元22之該半速信號輸入端rmi， 使&驅動單疋22可依據該半速控制信號96控制該風爲 3之轉速，例如最低轉速。 本實加例之該驅動單元22係可為一驅動晶片。一 =而a，该啟動控制信號93與該轉速控制信號95之電 壓问低與該風扇3之轉速成反比，意即當該啟動控制信 唬93與該轉速控制信號％之電壓越低時，該風扇3之 轉速越陕，則该風扇3的啟動電流較大。反之，當該啟 動控制信號93與該轉速控制信號95之電壓越高時，該 風扇3之轉速越慢，則該風扇3的啟動電流較小。另外， 依據該驅動晶片之規格，當該信號輸入端να接收之電 壓大於一最低轉速電壓時，則該驅動晶片控制該風扇3 以最低轉速運轉。 该外部系統2可藉由該控制裝置2〇控制該風扇3 轉速以達到政熱需求，當該外部系統2與該控制裝置 2〇啟動時，該外部系統2可能需先進行初始化動作而 無法發出該目標轉速控制信號94，此時該啟動控制單 π 21產生該啟動控制信號93以控制該風扇3之轉速， 使該風扇3以低轉速或最低轉速運轉，以避免該風扇3 =啟動電流過大；並且經過一預定時間後，該啟動控制 早几21停止送出該啟動控制信號93，而若該外部系統 2仞始化完成，即可發出該目標轉速控制信號94以控 制該風扇3之轉速。此外，若該風扇3運轉異常時，該 控制裝置20會收到該警示信號92，例如風扇3被異物 1279071 時’此時該啟動控制單元21產生該啟 里：产二㈣該風扇3以較低轉速運轉；並且當 20= ΐ後，該風扇3重新啟動時，該控制裝置 動控制信號93以避免該風扇3之啟動電流 過大，而造成該風扇3之元件損壞。The start control unit generates the start-up - the drive control unit ΒπΓΓ is activated and the fan is electrically connected, and the rotation speed of the fan is controlled according to the start control signal. As described above, a fan system and a control device therefor according to the present invention control the fan to be started at a lower rotational speed when the fan is started or restarted by the start control unit. Compared with the prior art, the present invention can solve the problem of excessive starting current, avoiding damage to the components of the fan or temperature rise due to excessive rotation speed. [Embodiment] Hereinafter, a fan system and a control device therefor according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. Referring to Figure 2, a control unit 20 for a fan system in accordance with a preferred embodiment of the present invention can be used with an external system 2, and 1279071 has at least one fan 3. The control device 2 receives the start voltage 91 and a warning signal %. The starting voltage 9 j is provided by an external voltage source V, and the control device 2 starts to operate after receiving the starting voltage 91. The control device 20 includes an activation control unit 21, a drive unit 22, and a rotational speed control unit 23. When the start voltage 91 is received, the start control unit 2 generates a start control signal 93, and the start control signal 93 of the embodiment can be repaired to a high potential signal, and after a predetermined time, the start control unit 21 stops sending the start control signal 93. When the start voltage 91 and the warning signal 92 are received, the start control unit 21 generates the start control signal 93 to the drive unit 22. The driving unit 22 is electrically connected to the starting control unit 21 and the fan 3, respectively, and receives and controls the rotation speed of the fan 3 according to the starting control signal 93. In this embodiment, the driving unit 22 can have a signal input terminal Vth and a half speed signal input terminal RMI. The signal input terminal Vth is electrically connected to the start control element 21 to receive the start control signal 93' and to control the rotation speed of the fan 3 according to the start control signal 93. The speed control unit 23 receives the start voltage 91 and generates a speed control signal 95 and/or a half speed control signal 96 to the drive unit 22 according to the start voltage 91 and a target speed control signal 94. The target rotational speed control signal 94 is a Pulse Width Modulation (PWM) signal provided by the external system 2. In addition, the rotation speed control unit 23 sends the half speed control 1270171 # 虎 96 96 to the half speed signal input terminal rmi of the driving unit 22, so that the & drive unit 22 can control the wind according to the half speed control signal 96. It is a speed of 3, such as the minimum speed. The driving unit 22 of the present embodiment can be a driving wafer. a = and a, the voltage of the start control signal 93 and the speed control signal 95 is inversely proportional to the speed of the fan 3, that is, when the voltage of the start control signal 93 and the speed control signal is lower, The more the rotation speed of the fan 3 is, the larger the starting current of the fan 3 is. On the other hand, when the voltage of the start control signal 93 and the rotational speed control signal 95 is higher, the rotational speed of the fan 3 is slower, and the starting current of the fan 3 is smaller. Further, according to the specification of the driving chip, when the voltage received by the signal input terminal να is greater than a minimum rotational speed voltage, the driving wafer controls the fan 3 to operate at the minimum rotational speed. The external system 2 can control the rotation speed of the fan 3 by the control device 2 to meet the political heat demand. When the external system 2 and the control device 2 are activated, the external system 2 may need to perform an initialization operation first and cannot be issued. The target speed control signal 94, at which time the start control unit π 21 generates the start control signal 93 to control the speed of the fan 3, so that the fan 3 operates at a low or minimum speed to avoid the fan 3 = starting current is too large And after a predetermined period of time, the start control 21 stops sending the start control signal 93, and if the external system 2 is completed, the target speed control signal 94 can be issued to control the speed of the fan 3. In addition, if the fan 3 is abnormally operated, the control device 20 receives the warning signal 92. For example, when the fan 3 is foreign object 1279071, the startup control unit 21 generates the Kaili: the second (four) fan 3 is compared. The low speed operation; and when the fan 3 is restarted after 20=ΐ, the control device controls the signal 93 to prevent the starting current of the fan 3 from being excessively large, thereby causing damage to the components of the fan 3.
/請_參閱目3,為本發明難實施狀—種風扇 ::統之控制裝置之-電路圖。該啟動控制單元21具有 巧個開關凡件h、Q2、複數個電阻器R1〜R4及一電 谷器Cl ，、中，本實施例之開關元件Qi、Q2可為一電 晶體或其他具有開關功能之電子元件。 該開關元件Ql之一源極S與該電壓源v電性連 接:以接收該啟始㈣91。該電阻器Ri之—端與該開 關元件Q!之§亥源極s電性連接，該電容器Cl之一端與 孩電阻為Ri之一另一端電性連接，且該電容器Ci之一 另一端接地。 該電阻器R2之一端與該開關元件Qi之一汲極1)電 性連接，且該電阻器&之一另一端與該驅動單元22之 该信唬輸入端Vth電性連接。該電阻器&之一端與該電 谷态Ci之該端電性連接，且該電阻器&之一另一端接 地。该開關元件Q2之一基極B係接收該警示信號92， 且該開關元件Q2之一集極C與該開關元件仏之一閘極 G電性連接，該開關元件q2之一射極e接地。此外， 本實施例中，該電阻器r4之一端與該電容器Ci之該端 電性連接，且該電阻器R4之一另一端與該開關元件q2 1279071 ♦之该集極c電性連接，使得該開關元件^之該集極c 與该開關元件Q!之該閘極G透過該電阻器&電性連 接。 - 該轉速控制單元23具有一開關元件Q3、複數個電 R5 R9及電各器C2。其中，本實施例之開關元 件Q3可為一電晶體或其他具有開關功能之電子元件。 該電阻器Rs之一端與該電壓源V電性連接，以接 •收該啟始電壓9卜該開關元件Q3之一集極c與該電阻 器I之一另一端電性連接，該開關元件Q3之一基極6 接收該目標轉速控制信號94，該開關 B電性連接，且該電阻器&之一另一端與該電阻器& 之該端電性連接。 該電阻器R7之一端與該開關元件Q3之該集極C電 性連接，且該電容器C2之一端與該電阻器心之一另一 ❿端電性連接。該電容器C2之該端與該驅動單元22電性 連接’且送出該轉速控制信號95。 該控制裝置20作動方式如下：當該外部系統2與 該控制裝置20同時啟動時，該外部系統2進行初始化 — 作動而無法送出該目標轉速控制信號94並且該控^裝 置20未收到該警示信號92’此時該開關元件仏之該閘 極G與該源極S之間因為接收該啟始電壓91的輸入， 而使得該開關元件Ql導通，且同時該開關元件Q2、 不導通，使該啟動控制信號93送至該驅動單元22。此3 11 1279071 時該啟動控制信號93之電壓值約為該啟始電壓91之電 壓值，假設該啟始電壓91之電壓值大於該最低轉速電 壓，即可使該風扇3以最低轉速運轉。 此外，該控制裝置20啟動時，該電容器q開始充 電，經過該預定時間後，該電容器q與該電壓源V之 電壓差到達一特定電壓差時，該開關元件Qi不導通以 停止送出該啟動控制信號93，其中，該預定時間為該 電容器q之充電時間，可依據實際需求選擇該電容器 q之電容值，以決定該預定時間之長短。 此時，若該外部系統2已完成初始化動作，即可提 供該目標轉速控制信號94，此時該開關元件h導通， 且该開關元件Qi、Q2為不導通，因此該轉速控制單元 23依據該目標轉速控制信號94產生該轉速控制信號％ 至該驅動單元22，使得該驅動單元22依據該轉速控制/ Please refer to item 3, which is a difficult implementation of the present invention - a type of fan: the control device of the system - circuit diagram. The start control unit 21 has a switch unit h, Q2, a plurality of resistors R1 R R4 and a battery C, wherein the switching elements Qi, Q2 of the embodiment can be a transistor or other switch. Functional electronic components. A source S of the switching element Q1 is electrically connected to the voltage source v to receive the starting (four) 91. The end of the resistor Ri is electrically connected to the source s of the switching element Q!, one end of the capacitor C1 is electrically connected to the other end of the Ri resistor, and the other end of the capacitor Ci is grounded. . One end of the resistor R2 is electrically connected to one of the switching elements Qi, and the other end of the resistor & is electrically connected to the signal input terminal Vth of the driving unit 22. One end of the resistor & is electrically connected to the terminal of the valley state Ci, and the other end of the resistor & is grounded. The base B of the switching element Q2 receives the warning signal 92, and one of the collectors C2 is electrically connected to one of the gates G of the switching element ,, and one of the switching elements q2 is grounded . In addition, in this embodiment, one end of the resistor r4 is electrically connected to the end of the capacitor Ci, and the other end of the resistor R4 is electrically connected to the collector c of the switching element q2 1279071 ♦ The collector c of the switching element is electrically connected to the gate G of the switching element Q! through the resistor & - The rotational speed control unit 23 has a switching element Q3, a plurality of electrical R5 R9 and an electrical device C2. The switching element Q3 of the embodiment may be a transistor or other electronic component having a switching function. One end of the resistor Rs is electrically connected to the voltage source V to receive and receive the starting voltage. The collector c of the switching element Q3 is electrically connected to the other end of the resistor I. The switching element is electrically connected. One of the bases 6 of Q3 receives the target rotational speed control signal 94, and the switch B is electrically connected, and the other end of the resistor & is electrically connected to the end of the resistor & One end of the resistor R7 is electrically connected to the collector C of the switching element Q3, and one end of the capacitor C2 is electrically connected to the other end of the resistor core. The end of the capacitor C2 is electrically coupled to the drive unit 22 and the speed control signal 95 is sent. The control device 20 is actuated as follows: when the external system 2 is started simultaneously with the control device 20, the external system 2 is initialized-actuated to fail to send the target rotational speed control signal 94 and the control device 20 does not receive the alert. At the same time, the signal 92' is connected between the gate G and the source S of the switching element 因为 by receiving the input of the starting voltage 91, so that the switching element Q1 is turned on, and at the same time, the switching element Q2 is not turned on. The start control signal 93 is sent to the drive unit 22. The voltage value of the start control signal 93 is about the voltage value of the start voltage 91. If the voltage value of the start voltage 91 is greater than the minimum speed voltage, the fan 3 can be operated at the minimum speed. In addition, when the control device 20 is started, the capacitor q starts to charge. After the predetermined time, when the voltage difference between the capacitor q and the voltage source V reaches a certain voltage difference, the switching element Qi does not conduct to stop sending the start. The control signal 93, wherein the predetermined time is the charging time of the capacitor q, the capacitance value of the capacitor q can be selected according to actual needs to determine the length of the predetermined time. At this time, if the external system 2 has completed the initialization operation, the target speed control signal 94 can be provided. At this time, the switching element h is turned on, and the switching elements Qi and Q2 are non-conductive, so the speed control unit 23 according to the The target speed control signal 94 generates the speed control signal % to the drive unit 22, so that the drive unit 22 controls according to the speed
仏5虎9 5控制該風扇3的轉速。 邊控制裝置20藉由該啟動控制單元21控制該風扇 j啟動時，以最低轉速運轉以避免啟動電流過大。此外， "亥，速控制單元23更可具有二個電阻器R8、，該電 阻器Rs之一端與該電阻器&之該端電性連接，該電阻 器h之一另一端與該電阻器化之一端電性連接以形成 ^電路’用以提供該半速控制信號％至該驅動單元 2之該半速信號輸入端RMI。 另外，當該風扇3異常時，該控制裝置2()接收 邊警不信號92，此時哕 子^開關兀件A導通，使得該開關 12 1279071 . 元件Qi導通，因此使該啟動控制信號93送至該驅動單 元22，使該風扇3以最低轉速運轉，以避免該風扇3 之啟動電流過大。接著當異常情況排除後，該警示信號 - 92停止送入該控制裝置20且該控制裝置20重新啟動， - 此時該開關元件Qi導通，該開關元件Q2、Q3不導通， 使該啟動控制信號93送至該驅動單元22，以控制該風 扇3以最低轉速運轉，以防止啟動電流過大。此外，當 φ 该控制裝置2〇與該外部之電壓源V分離時，該電容器 C!殘存的電荷可經由該電阻器&放電，作為重置 (reset)，以避免下次開啟時，產生誤動作。 ^另外，請參閱圖4為本發明較佳實施例之一種風扇 系統之控制裝置之另一電路圖。 》 本實施例之該控制裝置與圖3之該控制裝置2〇不 同之處在於，該啟動控制單元21更具有—電阻器％， 八鈿與°亥電阻器Ri之該另一端電性連接，且一另一 • 端與該電容器q之該端電性連接。 ，該開關元件Qi之該閘極 電壓源之電壓值，仏5虎 9 5 controls the speed of the fan 3. When the start control unit 21 controls the fan j to start, the side control device 20 operates at the lowest rotational speed to prevent the starting current from being excessive. In addition, the "hai, speed control unit 23 may further have two resistors R8, one end of the resistor Rs is electrically connected to the end of the resistor & one end of the resistor h and the resistor One end of the device is electrically connected to form a circuit 'to provide the half speed control signal % to the half speed signal input terminal RMI of the driving unit 2. In addition, when the fan 3 is abnormal, the control device 2() receives the side alarm signal 92, at which time the switch ^ switch element A is turned on, so that the switch 12 1279071. The component Qi is turned on, thus causing the start control signal 93 The drive unit 22 is sent to operate the fan 3 at the minimum speed to prevent the starting current of the fan 3 from being excessive. Then, after the abnormal condition is eliminated, the warning signal - 92 stops being sent to the control device 20 and the control device 20 is restarted, - the switching element Qi is turned on, and the switching elements Q2, Q3 are not turned on, so that the start control signal is turned on. 93 is sent to the drive unit 22 to control the fan 3 to operate at the minimum speed to prevent the starting current from being excessive. In addition, when φ the control device 2 is separated from the external voltage source V, the residual charge of the capacitor C! can be discharged via the resistor & as a reset to avoid the next turn-on. Malfunction. In addition, please refer to FIG. 4, which is another circuit diagram of a control device for a fan system according to a preferred embodiment of the present invention. The control device of the present embodiment is different from the control device 2 of FIG. 3 in that the start control unit 21 further has a resistor %, and the eight ends are electrically connected to the other end of the ohm resistor Ri. And the other end is electrically connected to the end of the capacitor q. The voltage value of the gate voltage source of the switching element Qi,
當該控制裝置20啟動時，該厚 G與该源極s之電 及該電阻器R10之比值，使得 請參閱圖5之該開關元件 該電容器q充電時，v綞When the control device 20 is activated, the ratio of the thickness G to the source s and the resistor R10 is such that the switching element of FIG. 5 is charged.
關疋件Qi之一特性曲線圖，當 gs緩緩上升（圖中所示例如是_6 V 1279071 到-1 V )而通過该開關元件Q!之一電流Id(如圖4所示〕 以較緩慢的速度下降（圖中所示例如是到〇1),使得 通過該驅動單元22之電流能夠得到控制，並使該驅動 單元22之該信號輸入端Vth之電壓緩慢下降，因此該驅 動單兀22依據該信號輸入端Vth之電壓，控制該風扇3 之轉速缓慢上升，即可達到軟啟動（s〇ft_start)之功效 (如圖6所示）。 本發明亦揭露一種風扇系統係具有至少一風扇以 及一控制裝置，該風扇及該控制裝置係可與上述實施例 之該風扇3及該控制裝f 2G |有相同之構成與功能， 在此不加以贅述。 /宗上所述，因依本發明之—種風扇系統及其控制裝 置係藉由該啟動控制單元，控制該風扇於啟動或重新啟 動時，以較低轉速啟動。與習知技術純，本發明能夠 解決啟動電流過大之問題，避免該風扇之元件損壞或因 轉速過快造成溫升。 以上所述僅為舉例性，㈣為限制性者。任何未脫 離本發明之㈣與料’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】 圖1為一種習知風扇系統之控制裝置與一外部系 統共同作動之一示意圖； /、 圖2為本卷明較佳實施例之一種風扇系統之控制 1279071 .裝置之一示意圖； 圖3為本發明較佳實施例之一種風扇系統之控制 裝置之一電路圖； 圖4為本發明較佳實施例之一種風扇系統之控制 裝置之另一電路圖； 圖5為本發明較佳實施例之一種風扇系統之控制 裝置之開關元件之一特性曲線圖；以及 圖6為圖4中之風扇轉速之一示意圖。 元件符號說明： 2 外部系統 10、20 控制裝置 Η、23 轉速控制單元 12、22 驅動單元 101 、 94 目標轉速控制信號 102、95轉速控制信號 13、3 風扇 21 啟動控制單元 91 啟始電壓 92 警示信號 93 啟動控制信號 96 半速控制信號 Ql 〜Q3 開關元件 Ri 〜Rio 電阻器 心〜。 電容器 B 基極 C 集極 E 射極 G 閘極 S 源極 D 及極 V 電壓源 vth 信號輸入端 Id 電流 RMI 半速信號輸入端 15A characteristic curve of one of the components Qi, when gs rises slowly (for example, _6 V 1279071 to -1 V as shown in the figure) and passes through one of the switching elements Q! current Id (as shown in FIG. 4) The slower speed drop (shown, for example, to 〇1), allows the current through the drive unit 22 to be controlled, and the voltage at the signal input terminal Vth of the drive unit 22 is slowly decreased, so the drive list兀22 according to the voltage of the signal input terminal Vth, controlling the speed of the fan 3 to rise slowly, the soft start (s〇ft_start) can be achieved (as shown in Fig. 6). The invention also discloses that the fan system has at least A fan and a control device, the fan and the control device have the same configuration and function as the fan 3 and the control device f 2G | in the above embodiment, and are not described herein. The fan system and the control device thereof according to the invention control the fan to start at a lower rotation speed when starting or restarting by the start control unit. Compared with the conventional technology, the invention can solve the problem that the starting current is too large. Problem The element of the fan is damaged or the temperature rises due to the excessive speed. The above is only an example, and (4) is a restriction. Any equivalent modification or change without the material of the invention may be omitted. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a conventional fan system control device and an external system; FIG. 2 is a preferred embodiment of the present invention. FIG. 3 is a circuit diagram of a control device of a fan system according to a preferred embodiment of the present invention; FIG. 4 is a control device of a fan system according to a preferred embodiment of the present invention; FIG. 5 is a characteristic diagram of a switching element of a control device of a fan system according to a preferred embodiment of the present invention; and FIG. 6 is a schematic diagram of a fan speed in FIG. 4. Component symbol description: 2 External system 10, 20 control unit Η, 23 speed control unit 12, 22 drive unit 101, 94 target speed control signal 102, 95 speed control signal 13, 3 fan 21 start Start unit 91 Start voltage 92 Warning signal 93 Start control signal 96 Half speed control signal Q1 ~ Q3 Switching element Ri ~ Rio Resistor heart ~ Capacitor B Base C Collector E Emitter G Gate S Source D and pole V voltage source vth signal input terminal Id current RMI half speed signal input terminal 15