200949512 yo-υ^δ ^ /〇32twf.doc/n 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種散熱農置與方法， 於一種自動偵測與控制風扇的裝置與方法。 j疋有關 【先前技術】200949512 yo-υ^δ ^ /〇32twf.doc/n IX. Description of the invention: [Technical field of the invention] The present invention relates to a heat-dissipating farm and method, and a device for automatically detecting and controlling a fan method. j疋Related [Previous technology]
因為技術的進步，電子裝置(如電腦）中的處理器"己 憶卡與其他元件之工作解與轉消耗與日料 °， 正常操作下’由這些元件所產生的熱能也增加 言 致電子裝置的誤動作與損壞’通常需監測Ϊ ^件H將這些元件所產生的熱能散去，亦即將這 广件冷卻，簡溫度鋪在合理範_。將這些元件所 產生的熱能散去也可改善其可靠性。 電子裝置之散熱技術包括使用氣冷式散熱片與風扇。 ，如’散熱片可將熱能從待冷卻元件料至周_冷空 =。散熱片可包括平面金屬結構，以確保跟這些待冷卻元 間的良好熱接觸。然而，散熱片對某些電子裝置而古， 其效能可能不夠。 ° 另外’風扇可導入至電子裝置中’以在待冷卻元件 ^產生空氣流。南速運轉的風扇可導致較佳的冷卻效 二二，為風扇可更快地將熱空氣從待冷卻元件移走並將冷 、氣人向待冷卻元件。風扇也可跟散熱片—起用，以更改 良冷卻效率。風扇有多種類型，且其控制方法也有多種。 匕如’二線直流(DC)風扇與四線脈衝寬度調變(pWM)風扇 200949512 y〇-v^c» z 7032tw£doc/n 是常見的風扇，其可用於將熱能從電子裝置（比如電腦）的 内部元件散去。四線PWM風扇可包括或不包括内建式上 拉電阻。具内建式上拉電阻的四線PWM風扇相容於 INTEL的四線PWM風扇規格。Because of advances in technology, the processor in the electronic device (such as a computer) has been working with other components to reduce the consumption and consumption of raw materials. Under normal operation, the thermal energy generated by these components also increases. The malfunction and damage of the device 'usually need to monitor the heat energy generated by these components to dissipate the heat of these components, and the simple temperature is also cooled. Dissipating the heat generated by these components also improves their reliability. Thermal technology for electronic devices includes the use of air-cooled heat sinks and fans. For example, the heat sink can heat the material from the material to be cooled to the weekly _ cold air =. The heat sink may comprise a planar metal structure to ensure good thermal contact with the elements to be cooled. However, heat sinks may not be sufficient for some electronic devices. ° Further, the fan can be introduced into the electronic device to generate a flow of air at the component to be cooled. A south speed fan can result in better cooling efficiency. The fan can remove hot air from the component to be cooled more quickly and will cool the air to the component to be cooled. The fan can also be used with the heat sink to change the cooling efficiency. There are many types of fans, and there are many ways to control them. For example, '2-wire DC (DC) fan and 4-wire pulse width modulation (pWM) fan 200949512 y〇-v^c» z 7032tw£doc/n is a common fan that can be used to transfer thermal energy from electronic devices (such as The internal components of the computer are scattered. The four-wire PWM fan may or may not include a built-in pull-up resistor. The four-wire PWM fan with built-in pull-up resistor is compatible with INTEL's four-wire PWM fan specification.
圖1顯示傳統的三線DC風扇1〇4的輸出入介面1〇2。 輸出入介面102包括：接地端1〇6，電壓控制端1〇8與轉 速器端110。電壓控制端108是輸入端，而轉速器端11〇 ❹ 則是輸出端’其所提供的轉速資訊之頻率正比於此三線DC 風扇104的轉速。此三線DC風扇104的轉速可由參數，， 每分鐘轉速(RPM ’ Revolution(s) Per Minute)，，來描述。因 而’轉速資§il代表三線DC風扇104的轉速或RJPM，且可 用於三線DC風扇104的封閉迴圈轉速控制。藉由改變施 加至二線DC風扇104的電壓控制端1〇8的電壓，可控制 三線DC風扇104的轉速。比如，如果三線DC風扇104 的最大輸入電壓為12V，在風扇運轉期間，施加至電壓控 制端108的電壓可為4V〜12V。三線DC風扇104的轉速 ® 通常直接相關於施加至電壓控制端1〇8的電壓大小。 圖2顯示傳統的四線pwM風扇204的輸出入介面 202。此四線PWM風扇204可為具内建式上拉電阻的四線 PWM風扇’或者不具内建式上拉電阻的四線PWM風扇。 四線PWM風扇204具有：接地端206，電源端208，轉速 器端210與PWM控制端212。電源端208與PWM控制端 212是輸入端，而轉速器端210則是輸出端，其所提供的 轉速資訊之頻率正比於此四線PWM風扇204的轉速。因 200949512 z/032twf.doc/n 而，轉速資訊代表此四線PWM風扇2〇4的轉速或， 且可用於四線PWM風扇204的封閉迴圈轉速控制。 .藉由改變施加至PWM控制端212的信號(亦即，pwM .控制信號)的責任周期值，可控制此四線pWM風扇2〇4的 轉速。責任周期值為50%的PWM控制信號可控制此四線 PWM風扇204的轉速為此風扇全速下的5〇%。相似地， 貝任周期值為80%的PWM控制信號可控制此四線pwM φ 風扇的轉速為此風扇全速下的。亦即，當pwM 控制佗號的責任周期值增加或減少時，此四線pwM風扇 204的轉速也會隨之增加或減少。 一般而言，電子裝置可設計成能支援某一類型的風 扇。因此，電子裝置的使用者必需選擇此電子裝置所能用 的特定風扇，對於不知道此電子裂置的風扇規格的使用者 而言，這將造成不便。比如，當電腦使用者需選擇此電腦 的風扇時，使用者必需先檢查此電腦的主機板，以決定此 主機板能支援哪種類型的風扇。 e 【發明内容】 根據本發明，提供一種偵測一風扇之一類型並控制該 風扇之裝置，在運轉時，該風扇提供代表風扇轉速之一轉 速資訊，該裝置包括：一直流(DC)產生器，耦接至該風扇 並提供一第一電壓至該風扇；一電阻，當該產生器提 供該第一電壓時，該電阻提供相關於該風扇之該類型之一 感測電壓，其中該電阻連接至一參考電壓並耦接至該風扇 200949512 ^ 7032twf.doc/n 之一脈衝寬度調變(PWM)控制端；一輸入判斷元件，耦接 至該電阻以接收該感測電壓，該輸入判斷元件根據該感測 電壓來判斯該風扇是否為具一内建式上拉電阻之一四線 PWM風扇，並提供代表該判斷結果之一判斷信號；一 pWM 產生器，耦接至該輸入判斷元件以接收該判斷信號，如果 該判斷信號代表該風扇為具一内建式上拉電阻之該四線 PWM風扇的話’該PWM產生器提供一 PWM控制信號至 ❹ 該風扇以控制該風扇；以及一測速器’耗接至該DC產生 器與該pWM產生器，該測速器接收該轉速資訊以偵測該 風扇之該轉速的一變化。輸入判斷元件的輸出訊號會耦接 至PWM產生器與DC產生器。 另外，根據本發明’提供一種偵測一風扇之一類型並 控制該風扇之電路，在運轉時，該風扇提供代表該風扇之 一轉速之一轉速資訊，該電路包括：一積體電路，位於一 基板上。該積體電路包括：一直流(DC)產生器，耗接至該 風扇並提供一第一電壓至該風扇；一電阻，當該DC產生 器提供該第一電壓時，該電阻提供相關於該風扇之該類型 之一感測電壓，其中該電阻連接至一參考電壓並耦接至該 風扇之一脈衝寬度調變(PWM)控制端；一輸入判斷元件， 耦接至該電阻以接收該感測電壓，該輸入判斷元件根據該 感測電壓來判斷該風扇是否為具一内建式上拉電阻之一四 線PWM風扇，並提供代表該判斷結果之一判斷信號；一 PWM產生器，耦接至該輸入判斷元件以接收該判斷信號， 如果》亥判斷“號代表該風扇為具一内建式上拉電阻之該四 200949512 7υ-υπ〇 ^7032twf.doc/n 線PWM風扇的話，該PWM產生器提供一 PWM控制信號 至該風扇以控制該風扇；以及一測速器，耦接至該DC產 生器與該PWM產生器，該測速器接收該轉速資訊以偵測 該風扇之該轉速的一變化。 又根據本發明，提供一種偵測一風扇之一類型之方 法’在運轉時，該風扇提供代表該風扇之一轉速之一轉速 資訊’該方法包括：提供一第一電壓至該風扇；當該風扇 ❹ 接收該第一電壓時’本裝置/發明感測相關於該風扇之該類 型之一電壓’以決定該風扇是否為具一内建式上拉電阻之 一四線脈衝寬度調變(PWM)風扇。本發明/裝置可自動偵測 出下列三種風扇’並施以對應之控制訊號：1.四線PWM 風扇（内建上拉電阻）；2.四線PWM風扇（無内建上拉電 阻）；3_三線DC風扇。 為讓本發明之上述特徵和優點能更明顯易懂，下文特 舉實施例’並配合所附圖式，作詳細說明如下。 ® 【實施方式】 以下的敘述將伴隨著實施例的圖示，來詳細對本發明 所提出之實施例進行說明。在各圖示中所使用相同或相似 的參考標號’是用來敘述相同或相似的部份。 本發明實施例之裝置可自動偵測風扇類型，並根據此 風扇類型來適當控制此風扇。此自動偵測（aut〇matic detection)也稱為”自動彳貞測（aut〇_detect)”或，，自動偵測 (auto-detection)”。此裝置可併入至如電腦的電子裝置内， 200949512 ^ϋ-υπο 7032twf.doc/n 且自動偵測不同類型的風扇，如三線Dc風扇或四線pwM 風扇，此風扇可用於將電子裝置的元件所產生之熱能散 • 去。此裝置提供電子裝置的介面，以連接至不同類型風扇， 因而可減少電子裝置的研發時間與成本，並可使此電子裝 置的使用者方便使用。 圖3A顯示本發明實施例之風扇自動偵測與控制之裝 置300。比如，此裝置300可連接至一風扇（未示出），其^ 〇 於將電子裝置DG之元件（亦即待冷卻元件，比如電腦處理 器）所產生之熱能散去。此風扇可為任意類型，比如三線 DC風扇，具内建式上拉電阻的四線pWM風扇，或者不具 内建式上拉電阻的四線PWM風扇。此裝置3〇〇可自動偵 測風扇類型，並根據待冷卻元件的溫度來控制此風扇於不 同轉速。 裝置300包括：輸入判斷元件302，DC產生器304， PWM產生器306與測速器308。裝置300更包括：電阻 310’連接至參考電壓信號以提供相關於此風扇類型的感測 ® 電壓；以及輸出致能元件3Π，耦接至PWM產生器306。 在風扇自動偵測期間’回應於其所接收的感測電壓，輸入 判斷元件302可提供輸入判斷信號心。DC產生器304用 於輸出此風扇操作所需的DC電壓。PWM產生器306可輸 出具特定責任周期值的PWM控制信號。 裝置300也包括三個端：DCFANOUT端（電源/電壓控 制訊號輸出端)312，耦接至DC產生器304且可當成輸出 端；FANIN端(風扇轉速訊號輸入端)314，耦接至測速器 11 200949512 ^υ-υπο ζ. /032twf.doc/n 308且可當成輸入端；以及PWMFAN〇UT端(pwM控制訊 號輸出端)316，耦接至輸入判斷元件3〇2，並透過^出致 • 能元件311而搞接至產生器306。根據從輸入判斷 • 元件302所傳來的輸出致能信號sEN，輸出致能元件311 可將由PWM產生器306所提供的PWM控制信號從 PWMFANOUT 端 316 輪出。PWMFANOUT 端 316 可當成 輸出入端。比如，在系統電源啟動期間，pwmfan〇ut ❹ 端316之耦接，可使其能將相關於風扇類型的感測電壓輸 入，輸入判斷元件302。又比如，根據高電壓的輸出致能 信號SEN，PWMFANOUT端316之耦接，可使其能輸出 PWM產生器306所提供並透過輸出致能元件311所傳來 的PWM控制信號。 更者，裝置300包括連接器318，其提供風扇所對應 之輸出入介面。連接器318可有四隻接腳32〇，322，324 與326。接腳320搞接至接地端或參考電壓信號。接腳 324 與 326 分別耦接至 DCFANOUT 端 312，FANIN 端 314 與PWMFANOUT端316。比如，透過連接器318的接腳 3 22 ’ DCFANOUT端312可連接至風扇的電壓控制端(如果 此風扇疋二線DC風扇）或連接至風扇的電源端(如果此風 扇是四線PWM風扇）。又比如，透過連接器318的接腳 324 ’ FANIN端314可連接至風扇的風扇轉速輸出端。又 比如’透過連接器318的接腳326，PWMFANOUT端316 可連接至風扇的PWM控制端(如果此風扇是四線pwM風 扇）或者為空腳無作用（如果此風扇是三線DC風扇）。因 12 200949512 !?υ-υ^〇 7032twf.doc/n 而’連接器318可提供裝置300連接至不同類型風扇的輸 出入介面。Figure 1 shows the input/output interface 1〇2 of a conventional three-wire DC fan 1〇4. The input/output interface 102 includes a ground terminal 1〇6, a voltage control terminal 1〇8 and a converter terminal 110. The voltage control terminal 108 is the input terminal, and the tachometer terminal 11〇 is the output terminal'. The frequency of the rotational speed information provided is proportional to the rotational speed of the three-wire DC fan 104. The speed of this three-wire DC fan 104 can be described by the parameter, RPM ' Revolution(s) Per Minute). Therefore, the rotational speed §il represents the rotational speed of the three-wire DC fan 104 or RJPM, and can be used for the closed loop rotational speed control of the three-wire DC fan 104. The rotational speed of the three-wire DC fan 104 can be controlled by changing the voltage applied to the voltage control terminal 1〇8 of the two-wire DC fan 104. For example, if the maximum input voltage of the three-wire DC fan 104 is 12V, the voltage applied to the voltage control terminal 108 may be 4V to 12V during fan operation. The speed of the three-wire DC fan 104 is usually directly related to the magnitude of the voltage applied to the voltage control terminal 1〇8. 2 shows the output interface 202 of a conventional four-wire pwM fan 204. The four-wire PWM fan 204 can be a four-wire PWM fan with built-in pull-up resistors or a four-wire PWM fan without built-in pull-up resistors. The four-wire PWM fan 204 has a ground terminal 206, a power terminal 208, a tachometer terminal 210 and a PWM control terminal 212. The power terminal 208 and the PWM control terminal 212 are inputs, and the tachometer terminal 210 is an output terminal, and the frequency of the rotational speed information is proportional to the rotational speed of the four-wire PWM fan 204. Since 200949512 z/032twf.doc/n, the rotational speed information represents the rotational speed of the four-wire PWM fan 2〇4, and can be used for the closed loop rotational speed control of the four-wire PWM fan 204. The rotational speed of the four-wire pWM fan 2〇4 can be controlled by varying the duty cycle value of the signal applied to the PWM control terminal 212 (i.e., the pwM. control signal). The PWM control signal with a duty cycle value of 50% controls the speed of the four-wire PWM fan 204 to be 5〇% of the full speed of the fan. Similarly, a PWM control signal with a period of 80% can control the speed of the four-wire pwM φ fan for this fan at full speed. That is, when the duty cycle value of the pwM control nickname is increased or decreased, the rotational speed of the four-wire pwM fan 204 is also increased or decreased. In general, electronic devices can be designed to support a certain type of fan. Therefore, the user of the electronic device must select a specific fan that can be used for the electronic device, which is inconvenient for a user who does not know the fan size of the electronic chip. For example, when a computer user needs to select a fan for this computer, the user must first check the motherboard of the computer to determine which type of fan the motherboard can support. According to the present invention, there is provided a device for detecting a type of a fan and controlling the fan. In operation, the fan provides information on the rotational speed of one of the fan speeds, the device comprising: DC generation a resistor coupled to the fan and providing a first voltage to the fan; a resistor that provides a sense voltage corresponding to the type of the fan when the generator provides the first voltage, wherein the resistor Connected to a reference voltage and coupled to the fan 200949512 ^ 7032 twf.doc / n one of the pulse width modulation (PWM) control terminals; an input determining component coupled to the resistor to receive the sensing voltage, the input is judged The component determines whether the fan is a four-wire PWM fan having a built-in pull-up resistor according to the sensing voltage, and provides a judgment signal representative of the determination result; a pWM generator coupled to the input judgment The component receives the determination signal, and if the determination signal indicates that the fan is the four-wire PWM fan with a built-in pull-up resistor, the PWM generator provides a PWM control signal to the Fan to control the fan; and a tachometer 'consumption connected to the DC generator and the pWM generator, which receives the speed information to detect a change in the rotational speed of the rotational speed of the fan. The output signal of the input judging component is coupled to the PWM generator and the DC generator. In addition, according to the present invention, a circuit for detecting a type of a fan and controlling the fan is provided. During operation, the fan provides information on the rotational speed of one of the speeds of the fan. The circuit includes: an integrated circuit located at On a substrate. The integrated circuit includes: a direct current (DC) generator that is connected to the fan and provides a first voltage to the fan; and a resistor that provides a correlation when the DC generator supplies the first voltage One of the types of the fan senses a voltage, wherein the resistor is coupled to a reference voltage and coupled to a pulse width modulation (PWM) control terminal of the fan; an input determining component coupled to the resistor to receive the sense Measuring the voltage, the input determining component determines, according to the sensing voltage, whether the fan is a four-wire PWM fan having a built-in pull-up resistor, and provides a judgment signal representing one of the determination results; a PWM generator, coupled Connecting to the input judging component to receive the judging signal, if the "hai" value indicates that the fan is the four 200949512 7υ-υπ〇^7032twf.doc/n line PWM fan with a built-in pull-up resistor, The PWM generator provides a PWM control signal to the fan to control the fan; and a speed detector coupled to the DC generator and the PWM generator, the speedometer receiving the rotational speed information to detect the rotational speed of the fan One According to the present invention, there is provided a method of detecting a type of a fan 'in operation, the fan provides information on the speed of one of the speeds of one of the fans'. The method includes: providing a first voltage to the fan; When the fan 接收 receives the first voltage, the device/invention senses a voltage related to the type of the fan to determine whether the fan is a four-wire pulse width modulation with a built-in pull-up resistor. (PWM) fan. The invention/device can automatically detect the following three types of fans' and apply corresponding control signals: 1. four-wire PWM fan (built-in pull-up resistor); 2. four-wire PWM fan (without built-in Pull-up resistors; 3_ three-wire DC fan. To make the above features and advantages of the present invention more comprehensible, the following detailed description of the embodiments will be described in detail below with reference to the accompanying drawings. The description of the embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or like reference characters The device of the embodiment can automatically detect the fan type and appropriately control the fan according to the fan type. This automatic detection (aut〇matic detection) is also called "aut彳贞_detect" or, Auto-detection. The device can be incorporated into an electronic device such as a computer, 200949512 ^ϋ-υπο 7032twf.doc/n and automatically detects different types of fans, such as a three-wire Dc fan or a four-wire pwM fan, which can be used to electronically The heat generated by the component is dissipated. The device provides an interface for the electronic device to connect to different types of fans, thereby reducing the development time and cost of the electronic device and making it convenient for the user of the electronic device. Figure 3A shows a device 300 for automatic fan detection and control in accordance with an embodiment of the present invention. For example, the device 300 can be coupled to a fan (not shown) that dissipates thermal energy generated by components of the electronic device DG (i.e., components to be cooled, such as computer processors). This fan can be of any type, such as a three-wire DC fan, a four-wire pWM fan with built-in pull-up resistors, or a four-wire PWM fan without built-in pull-up resistors. This unit automatically detects the fan type and controls the fan at different speeds depending on the temperature of the component to be cooled. The apparatus 300 includes an input determination component 302, a DC generator 304, a PWM generator 306, and a speedometer 308. The apparatus 300 further includes a resistor 310' coupled to the reference voltage signal to provide a sense ® voltage associated with the fan type; and an output enabler element Π coupled to the PWM generator 306. In response to the sensed voltage it receives during fan auto-detection, the input decision component 302 can provide an input decision signal heart. The DC generator 304 is used to output the DC voltage required for the operation of this fan. The PWM generator 306 can output a PWM control signal having a particular duty cycle value. The device 300 also includes three terminals: a DCFANOUT terminal (power/voltage control signal output terminal) 312, coupled to the DC generator 304 and can be regarded as an output terminal; and a FANIN terminal (fan speed signal input terminal) 314 coupled to the speed detector. 11 200949512 ^υ-υπο ζ. /032twf.doc/n 308 and can be regarded as an input terminal; and PWMFAN〇UT terminal (pwM control signal output terminal) 316, coupled to the input judging component 3〇2, and • Energy component 311 is coupled to generator 306. The output enable component 311 can rotate the PWM control signal provided by the PWM generator 306 from the PWMFANOUT terminal 316 based on the output enable signal sEN from the input decision element 302. The PWMFANOUT terminal 316 can be used as an input/output terminal. For example, during system power-up, the pwmfan〇 ❹ terminal 316 is coupled to enable input of a sense voltage associated with the fan type and input to the decision component 302. For example, according to the high voltage output enable signal SEN, the PWMFANOUT terminal 316 is coupled to enable the PWM control signal provided by the PWM generator 306 and transmitted through the output enable component 311 to be output. Moreover, device 300 includes a connector 318 that provides an input and output interface for the fan. Connector 318 can have four pins 32, 322, 324 and 326. Pin 320 is connected to ground or a reference voltage signal. Pins 324 and 326 are coupled to DCFANOUT terminal 312, FANIN terminal 314 and PWMFANOUT terminal 316, respectively. For example, the pin 3 22 'DCFANOUT terminal 312 through the connector 318 can be connected to the voltage control terminal of the fan (if the fan is a two-wire DC fan) or to the power terminal of the fan (if the fan is a four-wire PWM fan) . As another example, the pin 324' FANIN terminal 314 of the connector 318 can be coupled to the fan speed output of the fan. For example, 'through the pin 326 of the connector 318, the PWMFANOUT terminal 316 can be connected to the PWM control terminal of the fan (if the fan is a four-wire pwM fan) or has no effect on the empty leg (if the fan is a three-wire DC fan). The connector 318 can provide the input and output interfaces of the device 300 to different types of fans for the 12 200949512 !?υ-υ^〇 7032twf.doc/n.
根據輸入判斷元件302所接收到的感測電壓，輸入判 斷元件302可判斷連接至裝置300的此風扇是否為具内建 式上拉電阻的四線PWM風扇，但輸入判斷元件3〇2無法 判斷此風扇是否為二線DC風扇或不具内建式上拉電阻的 四線PWM風扇。比如，如果輸入判斷元件3〇2判斷出連 ❹ 接至裝置300的此風扇為具内建式上拉電阻的四線pwM 風扇的話’則輸入判斷元件302會輸出高電位的輸入判斷 信號S〗。否則’輸入判斷元件302會輸出低電位的輸入判 斷信號Sj。 DC產生器304與PWM產生器306都連接至輸入判 斷元件302，以接收此輸入判斷信號心。測速器3〇8連接 至DC產生器304與PWM產生器306以提供比較信號Sc。 如上述’由被控風扇所輸出的轉速資訊會從接腳324輸 ©入’其頻率正比於此風扇的轉速。根據連接至裝置3〇〇的 風扇所依序輸出的兩個連續轉速資訊，測速器308可決定 此風扇是否為三線DC風扇或者為不具内建式上拉電阻的 四線PWM風扇，並輸出可代表判斷結果的比較信號Sc。 比如’當測速器308判斷出連接至裝置300的此風扇為不 具内建式上拉電阻的四線PWM風扇的話，測速器308會 輸出高電位的比較信號Sc。或者，測速器308會輸出低電 位的比較信號Sc，代表此風扇為三線DC風扇。 圖3B顯示本發明實施例之裝置300執行風扇自動偵 13 200949512 ^.7032twf.doc/n 測與控制之方法的流程圖。參考圖3Α與圖3Β，在系統電 源啟動時，DC產生器304先輸出第一或初始電壓，透過 DCFANOUT端312與接腳322而提供電源給連接至此裝 置300的風扇，；PWMFAN0UT端316當成輸入端（圖3B， 步驟350)。比如，此第一電壓可為四線pWM風扇的正常 操作電壓，其可固定為12V並接近於三線DC風扇的最大 輸入電壓。又比如，輸入判斷元件3〇2可送出低電位的輸 ❹ 出致能信號Sen至輸出致能元件311。因此，pWM產生器 306所輸出的任何pWM控制信號都無法透過輸出致能元 件311來輸出，且PWMFAN0UT端316當成輸入端。 一旦接收到由DC產生器304所送來的電源，風扇可 開始運轉。輸入判斷元件302可從PWMFANOUT端316 接收到感測電壓。比如’此風扇為具内建式上拉電阻的四 線PWM風扇的話，電阻31〇、PWMFANOUT端316與此 四線PWM風扇的内建式上拉電阻會形成電流路徑’所導 致的電流會在電阻310上造成電壓降，其為在 ® PWMFANOUT端316所出現的高電位電壓。否則，相對 於參考電壓信號而言，低電位電壓會在pwMFAN〇UT端 316被感測到。 如果輸入判斷元件302感測(步驟352)到高電位電壓 的話’亦即PWMFANOUT=l(步驟354)，則輸入判斷元件 302會判斷出此風扇為具内建式上拉電阻的四線pWM風 扇（步驟356)，並輸出高電位的判斷信號心至DC：產生器 304與P WM產生器306 ’代表其已偵測到具内建式上拉電 200949512 -，032twf.doc/n 阻的四線PWM風扇。PWMFANOUT端316接著切換成輸 出端(步驟358)。比如，輸入判斷元件302可送出高電位^ 輸出致能信號SEN至輸出致能元件311。因此，由^^^^產 生器306所產生的PWM控制信號可由輸出致能元件311 送出’並送出至PWMFANOUT端316，使得PWmfan〇UtBased on the sensing voltage received by the input determining component 302, the input determining component 302 can determine whether the fan connected to the device 300 is a four-wire PWM fan with a built-in pull-up resistor, but the input determining component 3〇2 cannot determine Whether the fan is a two-wire DC fan or a four-wire PWM fan without a built-in pull-up resistor. For example, if the input judging element 3〇2 judges that the fan connected to the device 300 is a four-wire pwM fan with a built-in pull-up resistor, then the input judging element 302 outputs a high-potential input judging signal S. . Otherwise, the input judging element 302 outputs a low-potential input judging signal Sj. Both DC generator 304 and PWM generator 306 are coupled to input decision component 302 to receive the input decision signal heart. The speed detector 3〇8 is coupled to the DC generator 304 and the PWM generator 306 to provide a comparison signal Sc. The above-mentioned 'rotational speed information outputted by the controlled fan will be transmitted from the pin 324. The frequency is proportional to the rotational speed of the fan. According to the two consecutive speed information outputted by the fan connected to the device 3〇〇, the speedometer 308 can determine whether the fan is a three-wire DC fan or a four-wire PWM fan without a built-in pull-up resistor, and the output can be A comparison signal Sc representing the result of the judgment. For example, when the speedometer 308 determines that the fan connected to the device 300 is a four-wire PWM fan that does not have a built-in pull-up resistor, the speedometer 308 outputs a high potential comparison signal Sc. Alternatively, the tachometer 308 outputs a low level comparison signal Sc representing that the fan is a three wire DC fan. FIG. 3B is a flow chart showing a method for the apparatus 300 of the embodiment of the present invention to perform the automatic detection and control of the fan. Referring to FIG. 3A and FIG. 3A, when the system power is turned on, the DC generator 304 first outputs a first or initial voltage, and supplies power to the fan connected to the device 300 through the DCFANOUT terminal 312 and the pin 322; the PWMFAN0 terminal 316 serves as an input. End (Fig. 3B, step 350). For example, the first voltage can be the normal operating voltage of a four-wire pWM fan that can be fixed at 12V and is close to the maximum input voltage of the three-wire DC fan. For another example, the input judging element 3〇2 can send the low-output output enable signal Sen to the output enable element 311. Therefore, any pWM control signal output by the pWM generator 306 cannot be output through the output enable component 311, and the PWMFANOUT terminal 316 acts as an input. Once the power delivered by the DC generator 304 is received, the fan can begin to operate. Input determination component 302 can receive the sensed voltage from PWMFANOUT terminal 316. For example, if the fan is a four-wire PWM fan with built-in pull-up resistor, the current caused by the resistor 31〇, PWMFANOUT terminal 316 and the built-in pull-up resistor of the four-wire PWM fan will form a current path. A voltage drop is induced across resistor 310, which is the high potential voltage present at the PWMFANOUT terminal 316. Otherwise, the low potential voltage will be sensed at the pwMFAN〇UT terminal 316 relative to the reference voltage signal. If the input determination component 302 senses (step 352) to a high potential voltage, ie, PWMFANOUT=l (step 354), the input determination component 302 determines that the fan is a four-wire pWM fan with a built-in pull-up resistor. (Step 356), and outputting a high-potential determination signal to DC: generator 304 and P WM generator 306' represent four that have been detected with built-in pull-up 200949512 -, 032twf.doc/n resistance Line PWM fan. The PWMFANOUT terminal 316 is then switched to the output (step 358). For example, the input determination component 302 can send the high potential output enable signal SEN to the output enable element 311. Therefore, the PWM control signal generated by the ^^^^ generator 306 can be sent out by the output enable element 311 and sent out to the PWMFANOUT terminal 316, so that PWmfan〇Ut
端316當成輸出端。接著，裝置3〇〇可控制所偵測到的具 内建式上拉電阻的四線PWM風扇，於不同轉速。偵測完 畢，裝置300根據外界溫度輸入訊號S()，調整對風 制訊號大小。 乃一方面 职禾爾入判斷το件302感測到低電位電壓 的話，亦即PWMFANOUT=〇(步驟360)，則輸入判斷元件 3〇2會輸出不同的判斷信號Sj(比如低電位)至Dc： 3〇4與PWM產生器3〇6，代表需要更進一步的風扇價測。 如上述’PWMFAN0UT端316也切換成輸出端(步驟362)。 如果DC產生器綱與pWM產生器鄕從輸入判斷 兀件302所收到的判斷信號&代表需要更進一步的風 =話’ DC產生器3G4會輸出第二電壓，此第二電壓= 於弟-電位但仍足夠使風扇持續運轉，且pw _ 輸出具初始責任職的P侧控制信號(步驟364)。在某一 產生器綱所輸出的第二電壓可為^線 Γ由輸人電壓的寫(亦即，此第二電壓為6 %， 任_為50。/ 所輸出的PWM控制信號的初始責 4周，月為50/。。一般來說，對 輸入電壓的與安全的操作::線DC風扇來說’最大 15 200949512 >υ-υηο ^/O32twf.doc/n 連接至裝置300的此風扇會透過DCFANOUT端312 與接腳322而接收到從DC產生304所輸出的第二電 壓。如果此風扇是四線PWM風扇，此風扇也會透過 PWMFANOUT端316與接腳326而接收到由PWM產生器 306所輸出的具初始責任周期的PWM控制信號。根據此 風扇的運轉，回應於此第二電壓及可能的具初始責任周期 的PWM控制信號，此風扇會輸出代表此風扇的第一轉速 ❹ RPM1的第一轉速資訊。測速器308透過FANIN端314與 接腳324而接收到此第一轉速資訊，並記錄下步驟 366)。如果RPM1為〇’則決定：（1)風扇未連接至裝置3〇〇; 或(2)風扇有連接至裝置300，但此風扇異常/不工作。在另 一實施例中，裝置300會告知電子裝置此風扇並未正常 工作’則電子裝置D。的使用者可收到風扇警示，警示（j) 風扇未連接至裝置300 ;或(2)風扇有連接至裝置3〇〇，但 此風扇異常/不工作。 如果RPM1不為〇，則測速器308送出具第一值的比 β 較信號Sc至DC產生器304與PWM產生器306。一旦接 收從測速器308所送出的具第一值的比較信號&，產 生器304繼續送出第二電壓，且PWM產生器3〇6所輸出 的PWM控制信號的責任周期會增加(步驟368)。在某一實 施例中’PWM產生器306所輸出的PWM控制信號的責任 周期會增加為75%。 如果此風扇是四線PWM風扇的話，連接至裝置3q〇 的此風扇可透過PWMFANOUT端316與接腳326而接收 16 200949512 yo-u叫δ z/032twf.doc/n 到責任周期增加的PWM控制信號。根據風扇的運轉，回 應於此第二電壓及責任周期增加的PWM控制信號，此風 扇會輸出代表此風扇的第二轉速RPM2的第二轉速資訊。 測速器308透過FANIN端314而接收到此第二轉速資訊， 並記錄下RPM2，其代表風扇的新的轉速(步驟370)。 如上述’三線DC風扇的轉速可由改變此三線DC風 扇的輸入電壓而改變，而四線PWM風扇的轉速可由改變 輸入至此四線PWM風扇的PWM控制信號的責任周期而 改變。因而，比較RPM1與RPM2(步驟372)，測速器308 可決定此風扇是三線DC風扇還是不具内建式上拉電阻的 四線PWM風扇。比如，如果RPM2大於RPM1，代表風 扇的轉速已提高，測速器308可判斷出此風扇是不具内建 式上拉電阻的四線PWM風扇（步驟374)。如果RPM2不大 於RPM1，代表風扇的轉速未提高，測速器308可判斷出 此風扇是三線DC風扇（步驟376)。 一旦測速器308決定出此風扇是三線DC風扇還是不 具内建式上拉電阻的四線PWM風扇，測迷器308送出具 第二值的比較信號Sc給DC產生器304與PWM產生器 306。比如，測速器308所送出的具第二值的比較信號Sc 為高電位的話，則代表偵測到不具内建式上拉電阻的四線 PWM風扇；或者，具第二值的比較信號Sc為低電位的話， 則代表偵測到三線DC風扇。 在偵測出連接至此裝置3〇〇的風扇的類型後，DC產 生器304與PWM產生器306可設成相關工作模式。比如， 17 200949512 ^〇-wh〇 ^ /032twf.doc/n 此風扇是不具内建式上拉電阻的四線PWM風扇或者是具 内建式上拉電阻的四線PWM風扇的話，DC產生器304 . 可透過DCFANOUT端312與接腳322而輸出固定電壓(如 12V)或此四線PWM風扇的正常工作電壓給此四線pwM 風扇，以及PWM產生器306可透過PWMFANOUT端316 與接腳326而輸出責任周期可調整的PWM控制信號以控 制風扇轉速(步驟378)。另外，如果此風扇是此風扇是三線 φ DC風扇的話，DC產生器304可透過DCFANOUT端312 與接腳322而輸出可調式電壓以控制此風扇的轉遠，而輸 出致月b元件311被關閉（步驟380)。比如，當輸出致能元件 311被關閉時’pwMFANOUT端316為空腳無作用或保持 於低電位。 在某一實施例中，在接收到由輸入判斷元件3〇2所送 出的判斷仏號Sj與由測速器308所送出的比較信號心之 外’DC產生裔304與PWM產生器306也可接收由控制電 路(未顯不於圖3A)所送出的控制信號s〇。此控制信號s〇 可祀X據待冷卻元件的溫度而產生，且其所包括的資訊可代 表連接至裝置300的風扇的轉速是否需要降低或提高。根 據此控制信號S〇,在褒置3〇〇债測出此風扇的類型後，裝 置300可控制此風扇的轉速。 一比如，如果此控制信號s〇所包括的資訊代表需要提 高風扇的轉速且如果錢偵測到此風扇為三線DC風 扇的話’則Dc產生器304之輸出電壓會增加以增加三線 DC風扇的轉速。又比如，如果此控制信號％所包括的資 18 200949512 ^^ι~\β-τ\Λ ^7032twf.doc/nTerminal 316 acts as an output. Next, the device 3 can control the detected four-wire PWM fan with built-in pull-up resistors at different speeds. After the detection is completed, the device 300 inputs the signal S() according to the external temperature to adjust the size of the wind signal. If the low voltage is sensed, that is, PWMFANOUT=〇 (step 360), the input determination component 3〇2 outputs a different determination signal Sj (such as a low potential) to Dc. : 3〇4 with PWM generator 3〇6, which means that further fan price measurement is needed. The 'PWMFANOUT terminal 316 is also switched to the output as described above (step 362). If the DC generator and the pWM generator 鄕 from the input judgment component 302, the judgment signal & represents that further wind is required. The DC generator 3G4 outputs a second voltage, which is the second voltage. - Potential but still sufficient for the fan to continue to run, and pw_ output has a P-side control signal with initial responsibility (step 364). The second voltage outputted by a generator program can be written by the input voltage (that is, the second voltage is 6%, and _ is 50. / The initial duty of the PWM control signal outputted) 4 weeks, month is 50 /. In general, for the input voltage and safe operation:: line DC fan 'max 15 15951952 > υ-υηο ^ / O32twf.doc / n connected to the device 300 The fan receives the second voltage output from the DC generation 304 through the DCFANOUT terminal 312 and the pin 322. If the fan is a four-wire PWM fan, the fan is also received by the PWMFANOUT terminal 316 and the pin 326. The PWM control signal output by the generator 306 has an initial duty cycle. According to the operation of the fan, in response to the second voltage and possibly the PWM control signal with an initial duty cycle, the fan outputs a first speed representative of the fan.第一 The first rotational speed information of RPM 1. The speedometer 308 receives the first rotational speed information through the FANIN terminal 314 and the pin 324, and records step 366). If RPM1 is 〇' then decides: (1) the fan is not connected to device 3; or (2) the fan is connected to device 300, but the fan is abnormal/not working. In another embodiment, device 300 will inform the electronic device that the fan is not functioning properly 'electronic device D'. The user can receive a fan alert, alert (j) that the fan is not connected to device 300; or (2) the fan is connected to device 3, but the fan is abnormal/not working. If RPM1 is not 〇, then the tachometer 308 sends a ratio of the first value to the beta signal SC to the DC generator 304 and the PWM generator 306. Upon receiving the comparison signal & with the first value sent from the speedometer 308, the generator 304 continues to send the second voltage, and the duty cycle of the PWM control signal output by the PWM generator 3〇6 is increased (step 368). . In one embodiment, the duty cycle of the PWM control signal output by the 'PWM generator 306 is increased by 75%. If the fan is a four-wire PWM fan, the fan connected to the device 3q〇 can receive the PWM control through the PWMFANOUT terminal 316 and the pin 326. 2009 20091212 yo-u called δ z/032twf.doc/n to increase the duty cycle PWM control signal. According to the operation of the fan, the PWM control signal with the second voltage and the duty cycle is increased, and the fan outputs the second rotation speed information representing the second rotation speed RPM2 of the fan. The tachometer 308 receives this second rotational speed information through the FANIN terminal 314 and records the RPM 2, which represents the new rotational speed of the fan (step 370). The rotational speed of the 'three-wire DC fan as described above can be changed by changing the input voltage of the three-wire DC fan, and the rotational speed of the four-wire PWM fan can be changed by changing the duty cycle of the PWM control signal input to the four-wire PWM fan. Thus, comparing RPM1 with RPM2 (step 372), tachometer 308 can determine whether the fan is a three-wire DC fan or a four-wire PWM fan that does not have a built-in pull-up resistor. For example, if RPM2 is greater than RPM1, which represents an increase in the speed of the fan, tachometer 308 can determine that the fan is a four-wire PWM fan that does not have a built-in pull-up resistor (step 374). If RPM2 is not greater than RPM1, indicating that the fan speed has not increased, tachometer 308 can determine that the fan is a three-wire DC fan (step 376). Once the speedometer 308 determines whether the fan is a three-wire DC fan or a four-wire PWM fan that does not have a built-in pull-up resistor, the muzzle 308 sends a second value comparison signal Sc to the DC generator 304 and the PWM generator 306. For example, if the comparison signal Sc with the second value sent by the speed indicator 308 is high, it means that the four-wire PWM fan without the built-in pull-up resistor is detected; or the comparison signal Sc with the second value is A low potential means that a three-wire DC fan is detected. After detecting the type of fan connected to the device 3, the DC generator 304 and the PWM generator 306 can be set to an associated mode of operation. For example, 17 200949512 ^〇-wh〇^ /032twf.doc/n This fan is a four-wire PWM fan without built-in pull-up resistor or a four-wire PWM fan with built-in pull-up resistor, DC generator 304. The fixed voltage (such as 12V) or the normal working voltage of the four-wire PWM fan can be output to the four-wire pwM fan through the DCFANOUT terminal 312 and the pin 322, and the PWM generator 306 can pass through the PWMFANOUT terminal 316 and the pin 326. The duty cycle adjustable PWM control signal is output to control the fan speed (step 378). In addition, if the fan is a three-wire φ DC fan, the DC generator 304 can output an adjustable voltage through the DCFANOUT terminal 312 and the pin 322 to control the turn-around of the fan, and the output-causing b-element 311 is turned off. (Step 380). For example, when the output enable component 311 is turned off, the 'pwMFANOUT terminal 316 is inactive or remains low. In one embodiment, the DC generator 304 and the PWM generator 306 can also receive the decision signal Sj sent by the input determination component 3〇2 and the comparison signal sent by the speedometer 308. The control signal s〇 sent by the control circuit (not shown in Fig. 3A). This control signal s〇 can be generated based on the temperature of the component to be cooled, and the information it includes can indicate whether the rotational speed of the fan connected to the device 300 needs to be reduced or increased. Based on this control signal S, after the type of the fan is measured, the device 300 can control the speed of the fan. For example, if the information included in the control signal s represents the need to increase the speed of the fan and if the money detects that the fan is a three-wire DC fan, then the output voltage of the Dc generator 304 will increase to increase the speed of the three-wire DC fan. . For another example, if the control signal % includes the capital 18 200949512 ^^ι~\β-τ\Λ ^7032twf.doc/n
訊代表需要提高風扇的轉速且如果裝置3〇〇偵測到此風扇 為四線PWM風扇的話，則PWM產生器3〇6所輸出之pWM 控制信號的責任周期會增加以增加四線PWM風扇的轉 速。 圖4A與圖4B顯示根據本發明實施例之風扇自動備測 與控制之積體電路400。比如，積體電路400可為電腦主 機板上的積體電路’且其連接至可將電腦元件(亦即待冷卻 〇 元件，比如電腦的處理器）所產生之熱能散去的風扇。此風 扇種類比如為，（1)三線DC風扇，（2)具内建式上拉電阻的 四線PWM風扇或者是(3)不具内建式上拉電阻的四線 PWM風扇。積體電路400可自動偵測風扇的類型，並根 據待冷卻元件的溫度而控制風扇的轉速。 積體電路400可包括：輸入判斷元件4〇2，DC產生器 404 ’ PWM產生器406，測速器408，電阻410與輸出致 能元件411’其位於基板上且其操作相同於圖3A之輸入判 斷元件302，DC產生器304，PWM產生器306，測速器 β 308，電阻310與輸出致能元件311。輸入判斷元件402可 包括數位電路’包括類比電路’或同時包括數位電路與類 比電路；DC產生器404可包括類比電路；PWM產生器406 可包括數位電路’或同時包括數位電路與類比電路；測速 器408可包括數位電路。積體電路400可更包括 DCFANOUT 端 412，FANIN 端 414 與 PWMFANOUT 端 416，其操作分別相同於圖3A之DCFANOUT端312， FANIN 端 314 與 PWMFANOUT 端 316。 19 200949512 νο-υ^δ z /032twf.doc/n 在本發明實施例中，可在積體電路4〇〇外部提供連接 器418，其用於提供連接至此積體電路4⑻之風扇所需的 輸出入介面。連接器418可具有四個接腳42〇，422，424 與426。接腳420耦接至接地端或參考電壓信號。接腳422, 424與426則分別搞接至DCFANOUT端412，FANIN端 414 與 PWMFANOUT 端 416。 因1C製程的關係’DC產生器404與PWM產生器406 ❹ 所輸出之電壓或彳§號可能無法足夠驅動連接至積體電路 400的風扇。比如，DC產生器404所輸出之電壓可能為 3〜5V，而風扇之最大輸入電壓則為my。因而，電壓 調整電路430與PWM電壓調整電路432可位於積體電路 400外部，以分別放大DC產生器404與PWM產生器406 所輸出之信號。另外，DC電壓調整電路430，PWM電壓 5周整電路432 ’輸入判斷元件402，DC產生器404，PWM 產生器406，測速器408位於積體電路4〇〇内部。 在圖4A之實施例申，透過DC電壓調整電路430， ® DCFANOUT端412福接至連接器418的接腳422。透過 PWM電壓調整電路432 ’ PWMFANOUT端416輕接至連 接器418的接腳426。DC電壓調整電路430可放大由DC 產生器404所輸出的DC電壓；而PWM電壓調整電路432 可放大由PWM產生器406所輸出之PWM控制信號。 在圖4B所示之另一實施例中，DC電壓調整電路 430 ’ PWM電壓調整電路432，輸入判斷元件4〇2，DC產 生态404 ’ PWM產生器406，測速器408都位於積體電路 20 200949512 yo-υ 外 δ z /032twf.doc/n 400的基板。DC電壓調整電路.430耦接於DC產生器4〇4 與DCFANOUT端412之間，以放大由DC產生器404所 輸出的DC電壓，·而PWM電壓調整電路432耦接於pwM 產生器406與PWMFANOUT端416之間，以放大由pwM 產生器406所輸出之pwM控制信號。 雖然本發明已以實施例揭露如上’然其並非用以限定 本發明，任何所屬技術領域中具有通常知識者，在不脫離 ❹ 本發明之精神和範圍内，當可作些許之更動與潤飾，因此 ^發明之保護範圍當視後附之申請專利範圍所界定者為 【圖式簡單說明】 圖1顯示傳統的三線Dc風扇的輪出入介面。 圖2顯示傳統的四線PWM風扇的輸出入介面。 置。圖3A顯示本發明實施例之風扇自動偵測與控制之襄 β控制顯示本發明實施例之裝置執行風扇自動偵測與 與控積與趙圖電4Γ示根據本發明實施例之風扇自動偵測 【主要元件符號說明】 .二線DC風扇之輪出入介面 104 :三線DC風扇 200949512 ^/032twf.doc/n 108 :電壓控制端 106 ·接地端 110 :轉速器端 2〇2 :四線PWM風扇之輪出入介面 204 :四線PW1V[風扇 206 :接地端 208 :電源端 210 :轉速器端 212 : PWM控制端 300 :裝置 302 :輸入判斷元件 304 : DC產生器 306 : PWM產生器 308 :測速器 310 :電阻 311 :輸出致能元件 312 : DCFANOUT端（電源/電壓控制訊號輸出端） 314 : FANIN端(風扇轉速訊號輸入端） 316 : PWMFANOUT端(PWM控制訊號輸出端） 318 :連接器 320、322、324、326 :接腳 350、352、354、356、358、360、362、364、366、 368、370、372、374、376、378、380 :步驟 400 :積體電路 22 200949512 y〇-\jH〇 z. /032twf.doc/n 402 :輸入判斷元件 404 : DC產生器 406 : PWM產生器 408 :測速器 410 :電阻 411 :輸出致能元件 412 : DCFANOUT端（電源/電壓控制訊號輸出端) 414 : FANIN端(風扇轉速訊號輸入端） 416 : PWMFANOUT端(PWM控制訊號輸出端） 418 :連接器 420、422、424、426 :接腳 430 : DC電壓調整電路 432 : PWM電壓調整電路The representative needs to increase the fan speed. If the device 3 detects that the fan is a four-wire PWM fan, the duty cycle of the pWM control signal output by the PWM generator 3〇6 is increased to increase the four-wire PWM fan. Rotating speed. 4A and 4B show an integrated circuit 400 for automatic fan preparation and control according to an embodiment of the present invention. For example, the integrated circuit 400 can be an integrated circuit on a computer main board and connected to a fan that dissipates heat generated by a computer component (i.e., a processor to be cooled, such as a computer processor). The types of fans are, for example, (1) three-wire DC fans, (2) four-wire PWM fans with built-in pull-up resistors, or (3) four-wire PWM fans without built-in pull-up resistors. The integrated circuit 400 automatically detects the type of the fan and controls the speed of the fan based on the temperature of the component to be cooled. The integrated circuit 400 can include an input determining component 4〇2, a DC generator 404 'PWM generator 406, a speedometer 408, a resistor 410 and an output enabling component 411' on the substrate and operating the same as the input of FIG. 3A. The determining component 302, the DC generator 304, the PWM generator 306, the speedometer β 308, the resistor 310 and the output enabling component 311. The input determination component 402 can include a digital circuit 'including analog circuits' or both digital and analog circuits; the DC generator 404 can include analog circuits; the PWM generator 406 can include digital circuits or both digital and analog circuits; The 408 can include a digital circuit. The integrated circuit 400 can further include a DCFANOUT terminal 412, a FANIN terminal 414 and a PWMFANOUT terminal 416, which operate the same as the DCFANOUT terminal 312, the FANIN terminal 314 and the PWMFANOUT terminal 316 of FIG. 3A, respectively. 19 200949512 νο-υ^δ z /032twf.doc/n In the embodiment of the present invention, a connector 418 may be provided outside the integrated circuit 4 for providing a fan connected to the integrated circuit 4 (8). Input and output interface. Connector 418 can have four pins 42 〇, 422, 424 and 426. Pin 420 is coupled to ground or a reference voltage signal. Pins 422, 424 and 426 are connected to DCFANOUT terminal 412, FANIN terminal 414 and PWMFANOUT terminal 416, respectively. The voltage or 输出§ output by the DC generator 404 and the PWM generator 406 可能 may not be sufficient to drive the fan connected to the integrated circuit 400 due to the relationship of the 1C process. For example, the voltage output by the DC generator 404 may be 3 to 5V, and the maximum input voltage of the fan is my. Thus, the voltage adjustment circuit 430 and the PWM voltage adjustment circuit 432 can be external to the integrated circuit 400 to amplify the signals output by the DC generator 404 and the PWM generator 406, respectively. Further, the DC voltage adjusting circuit 430, the PWM voltage 5 week complete circuit 432' inputs the determining element 402, the DC generator 404, the PWM generator 406, and the speed measuring device 408 is located inside the integrated circuit 4'. In the embodiment of FIG. 4A, through the DC voltage adjustment circuit 430, the DCFANOUT terminal 412 is coupled to the pin 422 of the connector 418. The PWMFANOUT terminal 416 is lightly coupled to the pin 426 of the connector 418 via the PWM voltage adjustment circuit 432'. The DC voltage adjustment circuit 430 can amplify the DC voltage output by the DC generator 404; and the PWM voltage adjustment circuit 432 can amplify the PWM control signal output by the PWM generator 406. In another embodiment shown in FIG. 4B, DC voltage adjustment circuit 430 'PWM voltage adjustment circuit 432, input determination element 4〇2, DC generation state 404 'PWM generator 406, and speed detector 408 are all located in integrated circuit 20 200949512 yo-υ Outside δ z /032twf.doc/n 400 substrate. The DC voltage adjustment circuit .430 is coupled between the DC generator 4〇4 and the DCFANOUT terminal 412 to amplify the DC voltage output by the DC generator 404, and the PWM voltage adjustment circuit 432 is coupled to the pwM generator 406. Between the PWMFANOUT terminals 416 to amplify the pwM control signal output by the pwM generator 406. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the invention is defined by the scope of the appended patent application. [Simplified illustration of the drawings] Figure 1 shows the wheel-in and out interface of a conventional three-wire Dc fan. Figure 2 shows the input and output interface of a conventional four-wire PWM fan. Set. FIG. 3A shows the 控制β control of the automatic detection and control of the fan according to the embodiment of the present invention. The device of the embodiment of the present invention performs automatic fan detection and control and the control of the fan and the display of the automatic detection of the fan according to the embodiment of the present invention. [Main component symbol description]. Two-wire DC fan wheel access interface 104: Three-wire DC fan 200949512 ^/032twf.doc/n 108: Voltage control terminal 106 · Ground terminal 110: Tachometer terminal 2〇2: Four-wire PWM fan Wheel access interface 204: four-wire PW1V [fan 206: ground terminal 208: power terminal 210: tachometer terminal 212: PWM control terminal 300: device 302: input determination component 304: DC generator 306: PWM generator 308: speed measurement 310: resistor 311: output enable component 312: DCFANOUT terminal (power/voltage control signal output terminal) 314: FANIN terminal (fan speed signal input terminal) 316: PWMFANOUT terminal (PWM control signal output terminal) 318: connector 320 , 322, 324, 326: pins 350, 352, 354, 356, 358, 360, 362, 364, 366, 368, 370, 372, 374, 376, 378, 380: step 400: integrated circuit 22 200949512 y 〇-\jH〇z. /032twf.doc/n 402 : Enter Breaking element 404: DC generator 406: PWM generator 408: tachometer 410: resistor 411: output enabling component 412: DCFANOUT terminal (power/voltage control signal output) 414: FANIN terminal (fan speed signal input) 416 : PWMFANOUT terminal (PWM control signal output terminal) 418 : Connector 420, 422, 424, 426 : Pin 430 : DC voltage adjustment circuit 432 : PWM voltage adjustment circuit
23twenty three