TW201524059A - A fan with over-current protecting function - Google Patents

Abstract

A fan with over-current protecting function includes a fan protection circuit, a fan connector, and a fan circuit. The fan protection circuit includes a hot-swap controller, an electronic switch, first to sixth resistors, first and second capacitors. The hot-swap controller is connected to the electronic switch. The electronic switch is connected to the fan circuit.

Description

具有過流保護功能的風扇Fan with overcurrent protection

本發明係關於一種具有過流保護功能的風扇。The present invention relates to a fan having an overcurrent protection function.

目前，大多數電子產品都需要用風扇進行散熱。習知的風扇保護電路設置於主機板上，佔據主機板佈線空間。Currently, most electronic products require a fan for heat dissipation. The conventional fan protection circuit is disposed on the motherboard and occupies the wiring space of the motherboard.

鑒於以上內容，有必要提供一種具有過流保護功能的風扇，實現過流保護功能的電路設置於風扇內，不會佔據主機板的佈線空間。In view of the above, it is necessary to provide a fan with overcurrent protection function, and the circuit for implementing the overcurrent protection function is disposed in the fan, and does not occupy the wiring space of the motherboard.

一種具有過流保護功能的風扇，包括一風扇保護電路、一風扇連接器及一風扇電路，該風扇保護電路包括一熱交換控制器、一電子開關、第一至第六電阻及第一、第二電容，該熱交換控制器的感測引腳連接於該第一電阻的第一端，該第一電阻的第二端連接該風扇連接器的電源引腳，該風扇連接器的電源引腳還直接連接於該熱交換控制器的輸入引腳，該熱交換控制器的輸入引腳還透過該第二電阻連接於該熱交換控制器的第一電壓引腳，該熱交換控制器的第一電壓引腳還依序透過該第三電阻及該第四電阻接地，該熱交換控制器的第二電壓引腳連接於該第三及第四電阻之間的節點，該熱交換控制器的定時引腳透過該第一電容接地，該熱交換控制器的電源控制引腳透過該第五電阻接地，該熱交換控制器的電源準備好引腳透過該第六電阻連接於該風扇電路及該熱交換控制器的輸出引腳，該熱交換控制器的控制引腳連接於該第一電子開關的控制端，該電子開關的第一端連接於該第一電阻的第一端，該電子開關的第二端連接該熱交換控制器的輸出引腳，該第二電容連接在該熱交換控制器的輸出引腳與地之間；該熱交換控制器的感測引腳及輸入引腳用於偵測該第一電阻兩端的電壓差，進而得到透過第一電阻的電流值，該熱交換控制器將所得到的電流值與風扇正常工作所對應的預設電流值進行比較，當該電流值不大於該預設電流值時，該熱交換控制器的控制引腳輸出高電平訊號，當該電流值大於該預設電流值時，該熱交換控制器的控制引腳輸出低電平訊號；當該電子開關的控制端接收高電平訊號時，該電子開關的第一端與第二端導通，當該電子開關的控制端接收低電平訊號時，該電子開關的第一端與第二端斷開。A fan with an overcurrent protection function includes a fan protection circuit, a fan connector and a fan circuit. The fan protection circuit includes a heat exchange controller, an electronic switch, first to sixth resistors, and first and second a second capacitor, a sensing pin of the heat exchange controller is connected to the first end of the first resistor, and a second end of the first resistor is connected to a power pin of the fan connector, and a power pin of the fan connector Also directly connected to the input pin of the heat exchange controller, the input pin of the heat exchange controller is further connected to the first voltage pin of the heat exchange controller through the second resistor, the heat exchange controller a voltage pin is also grounded through the third resistor and the fourth resistor in sequence, and a second voltage pin of the heat exchange controller is connected to a node between the third and fourth resistors, and the heat exchange controller The timing pin is grounded through the first capacitor, and the power control pin of the heat exchange controller is grounded through the fifth resistor, and the power supply ready pin of the heat exchange controller is connected to the fan circuit through the sixth resistor and An output pin of the heat exchange controller, the control pin of the heat exchange controller is connected to the control end of the first electronic switch, and the first end of the electronic switch is connected to the first end of the first resistor, the electronic switch The second end is connected to the output pin of the heat exchange controller, and the second capacitor is connected between the output pin of the heat exchange controller and the ground; the sensing pin and the input pin of the heat exchange controller are used Detecting a voltage difference across the first resistor to obtain a current value that is transmitted through the first resistor, and the heat exchange controller compares the obtained current value with a preset current value corresponding to a normal operation of the fan, when the current is When the value is not greater than the preset current value, the control pin of the heat exchange controller outputs a high level signal, and when the current value is greater than the preset current value, the control pin of the heat exchange controller outputs a low level. When the control end of the electronic switch receives the high level signal, the first end and the second end of the electronic switch are turned on, and when the control end of the electronic switch receives the low level signal, the first end of the electronic switch With the second end Open.

上述具有過流保護功能的風扇將風扇保護電路設置於該風扇內，不佔據主機板的空間，該風扇保護電路在該風扇短路時，該電子開關斷開以切斷該風扇連接器的電源引腳至該風扇電路的供電電路。The fan with the overcurrent protection function is disposed in the fan, and does not occupy the space of the motherboard. When the fan is short-circuited, the electronic switch is turned off to cut off the power of the fan connector. The foot is connected to the power supply circuit of the fan circuit.

100‧‧‧風扇保護電路100‧‧‧Fan protection circuit

400‧‧‧主機板風扇連接器400‧‧‧ motherboard fan connector

200‧‧‧風扇連接器200‧‧‧Fan Connector

300‧‧‧風扇電路300‧‧‧Fan Circuit

2‧‧‧風扇2‧‧‧fan

U1‧‧‧熱交換控制器U1‧‧‧Heat Exchange Controller

Q1‧‧‧場效應電晶體Q1‧‧‧ Field Effect Transistor

R1-R6‧‧‧電阻R1-R6‧‧‧ resistance

C1-C3‧‧‧電容C1-C3‧‧‧ capacitor

圖1是本發明具有過流保護功能的風扇較佳實施方式的電路圖。BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a circuit diagram of a preferred embodiment of a fan having an overcurrent protection function of the present invention.

請參考圖1，本發明具有過流保護功能的風扇2包括一風扇連接器200、一風扇電路300及一風扇保護電路100。該風扇保護電路100、風扇連接器200及該風扇電路300設置於該風扇2的殼體內。該風扇保護電路100包括一熱交換控制器U1、一場效應電晶體Q1、電阻R1-R6及電容C2、C3，其中該場效應電晶體Q1為N溝道場效應電晶體。Referring to FIG. 1 , the fan 2 with overcurrent protection function includes a fan connector 200 , a fan circuit 300 , and a fan protection circuit 100 . The fan protection circuit 100, the fan connector 200, and the fan circuit 300 are disposed in a casing of the fan 2. The fan protection circuit 100 includes a heat exchange controller U1, a field effect transistor Q1, resistors R1 - R6 and capacitors C2, C3, wherein the field effect transistor Q1 is an N-channel field effect transistor.

主機板上設有一主機板風扇連接器400，該主機板風扇連接器400的電源引腳VCC連接於一風扇供電電源P12V，該風扇供電電源P12V還透過一電容C1接地。A motherboard fan connector 400 is disposed on the motherboard. The power pin VCC of the motherboard fan connector 400 is connected to a fan power supply P12V. The fan power supply P12V is also grounded through a capacitor C1.

該熱交換控制器U1的感測引腳SENSE連接於該電阻R1的第一端，該電阻R1的第二端連接該風扇連接器200的電源引腳VCC。該風扇連接器200的電源引腳VCC還直接連接於該熱交換控制器U1的輸入引腳VIN。該熱交換控制器U1的輸入引腳VIN還透過電阻R2連接於該熱交換控制器U1的第一電壓引腳UVLO，該熱交換控制器U1的第一電壓引腳UVLO還依序透過該電阻R3及電阻R4接地，該熱交換控制器U1的第二電壓引腳OVLO連接於該電阻R3與R4之間的節點。該熱交換控制器U1的定時引腳TIMER透過該電容C2接地，該熱交換控制器U1的電源控制引腳PWR透過電阻R5接地，該熱交換控制器U1的電源準備好引腳PGD透過電阻R6連接於該風扇電路300及該熱交換控制器U1的輸出引腳OUT。The sensing pin SENSE of the heat exchange controller U1 is connected to the first end of the resistor R1, and the second end of the resistor R1 is connected to the power pin VCC of the fan connector 200. The power pin VCC of the fan connector 200 is also directly connected to the input pin VIN of the heat exchange controller U1. The input pin VIN of the heat exchange controller U1 is also connected to the first voltage pin UVLO of the heat exchange controller U1 through the resistor R2, and the first voltage pin UVLO of the heat exchange controller U1 is also sequentially transmitted through the resistor. R3 and resistor R4 are grounded, and a second voltage pin OVLO of the heat exchange controller U1 is connected to a node between the resistors R3 and R4. The timing pin TIMER of the heat exchange controller U1 is grounded through the capacitor C2. The power control pin PWR of the heat exchange controller U1 is grounded through the resistor R5. The power supply of the heat exchange controller U1 is ready to be pinged through the resistor R6. Connected to the fan circuit 300 and the output pin OUT of the heat exchange controller U1.

該熱交換控制器U1的控制引腳GATE連接於該場效應電晶體Q1的閘機，該場效應電晶體Q1的汲極連接該電阻R1的第一端，該場效應電晶體Q1的源極連接該熱交換控制器U1的輸出引腳OUT，該電容C3連接在該熱交換控制器U1的輸出引腳OUT與地之間。The control pin GATE of the heat exchange controller U1 is connected to the gate of the field effect transistor Q1, and the drain of the field effect transistor Q1 is connected to the first end of the resistor R1, the source of the field effect transistor Q1 The output pin OUT of the heat exchange controller U1 is connected, and the capacitor C3 is connected between the output pin OUT of the heat exchange controller U1 and the ground.

該風扇供電電源P12V直接給該主機板風扇連接器400供電，當該風扇2透過該風扇連接器200連接於該主機板風扇連接器400後，即該風扇連接器200的電源引腳VCC連接於該主機板風扇連接器400的電源引腳VCC後，該風扇供電電源P12V透過該熱交換控制器U1及該場效應電晶體Q1供電給該風扇電路300。The fan power supply P12V directly supplies power to the motherboard fan connector 400. When the fan 2 is connected to the motherboard fan connector 400 through the fan connector 200, the power connector VCC of the fan connector 200 is connected to After the power supply pin VCC of the motherboard fan connector 400, the fan power supply P12V is supplied to the fan circuit 300 through the heat exchange controller U1 and the field effect transistor Q1.

該熱交換控制器U1的感測引腳SENSE及輸入引腳VIN用於偵測該電阻R1兩端的電壓差，進而根據電阻R1的阻值得到透過電阻R1的電流值，該熱交換控制器U1根據所得到的電流值與預設電流值進行比較。當該電流值不大於該熱交換控制器U1的預設電流值時，該熱交換控制器U1的控制引腳GATE輸出高電平訊號，當該電流值大於該熱交換控制器U1的預設電流值時，該熱交換控制器U1的控制引腳GATE輸出低電平訊號。The sensing pin SENSE and the input pin VIN of the heat exchange controller U1 are used to detect the voltage difference across the resistor R1, and the current value of the transimpedance resistor R1 is obtained according to the resistance of the resistor R1. The heat exchange controller U1 The current value is compared with the preset current value. When the current value is not greater than the preset current value of the heat exchange controller U1, the control pin GATE of the heat exchange controller U1 outputs a high level signal, when the current value is greater than the preset of the heat exchange controller U1. At the current value, the control pin GATE of the heat exchange controller U1 outputs a low level signal.

使用時，該風扇2透過該風扇連接器200連接於該主機板風扇連接器400，即該風扇連接器200的電源引腳VCC連接於該主機板風扇連接器400的電源引腳VCC，當該風扇2正常工作時，即透過該電阻R1的電流值不大於該熱交換控制器U1的預設電流值，該熱交換控制器U1的控制引腳GATE持續輸出高電平訊號使得該場效應電晶體Q1導通，該風扇供電電源P12V透過該電阻R1及該場效應電晶體Q1持續供電給該風扇電路300。In use, the fan 2 is connected to the motherboard fan connector 400 through the fan connector 200, that is, the power pin VCC of the fan connector 200 is connected to the power pin VCC of the motherboard fan connector 400. When the fan 2 is working normally, that is, the current value through the resistor R1 is not greater than the preset current value of the heat exchange controller U1, the control pin GATE of the heat exchange controller U1 continuously outputs a high level signal to make the field effect electric The crystal Q1 is turned on, and the fan power supply P12V continuously supplies power to the fan circuit 300 through the resistor R1 and the field effect transistor Q1.

當該風扇2短路或電流異常增大時，即透過該電阻R1的電流值大於該熱交換控制器U1的預設電流值時，該熱交換控制器U1的控制引腳GATE輸出低電平訊號使得該場效應電晶體Q1截止，該風扇供電電源P12V停止給該風扇電路300供電，該風扇2停止工作。When the fan 2 is short-circuited or the current is abnormally increased, that is, when the current value of the resistor R1 is greater than the preset current value of the heat exchange controller U1, the control pin GATE of the heat exchange controller U1 outputs a low-level signal. The field effect transistor Q1 is turned off, the fan power supply P12V stops supplying power to the fan circuit 300, and the fan 2 stops operating.

從上面的描述可以看出，該場效應電晶體Q1起到電子開關的作用，其他實施方式中，該場效應電晶體Q1亦可用其他電子開關來代替，其中，場效應電晶體的閘機、汲極及源極分別對應電子開關的控制端、第一端及第二端。As can be seen from the above description, the field effect transistor Q1 functions as an electronic switch. In other embodiments, the field effect transistor Q1 can also be replaced by other electronic switches, wherein the gate of the field effect transistor, The drain and the source respectively correspond to the control end, the first end and the second end of the electronic switch.

上述具有過流保護功能的風扇2將風扇保護電路100設置於該風扇2內，不佔據主機板的空間，該風扇保護電路100在該風扇2短路時，該場效應電晶體Q1截止以切斷該風扇供電電源P12V供電至該風扇電路300的供電電路。The fan 2 having the overcurrent protection function has the fan protection circuit 100 disposed in the fan 2 and does not occupy the space of the motherboard. When the fan protection circuit 100 is short-circuited, the field effect transistor Q1 is turned off to cut off. The fan power supply P12V is supplied to the power supply circuit of the fan circuit 300.

綜上所述，本發明確已符合發明專利的要件，爰依法提出專利申請。惟，以上所述者僅為本發明的較佳實施方式，本發明的範圍並不以上述實施方式為限，舉凡熟悉本案技藝的人士援依本發明的精神所作的等效修飾或變化，皆應涵蓋於以下申請專利範圍內。In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. It should be covered by the following patent application.

無no

100‧‧‧風扇保護電路 100‧‧‧Fan protection circuit

400‧‧‧主機板風扇連接器 400‧‧‧ motherboard fan connector

200‧‧‧風扇連接器 200‧‧‧Fan Connector

300‧‧‧風扇電路 300‧‧‧Fan Circuit

2‧‧‧風扇 2‧‧‧fan

U1‧‧‧熱交換控制器 U1‧‧‧Heat Exchange Controller

Q1‧‧‧場效應電晶體 Q1‧‧‧ Field Effect Transistor

R1-R6‧‧‧電阻 R1-R6‧‧‧ resistance

C1-C3‧‧‧電容 C1-C3‧‧‧ capacitor

Claims (2)

一種具有過流保護功能的風扇，包括一風扇保護電路、一風扇連接器及一風扇電路，該風扇保護電路包括一熱交換控制器、一電子開關、第一至第六電阻及第一、第二電容，該熱交換控制器的感測引腳連接於該第一電阻的第一端，該第一電阻的第二端連接該風扇連接器的電源引腳，該風扇連接器的電源引腳還直接連接於該熱交換控制器的輸入引腳，該熱交換控制器的輸入引腳還透過該第二電阻連接於該熱交換控制器的第一電壓引腳，該熱交換控制器的第一電壓引腳還依序透過該第三電阻及該第四電阻接地，該熱交換控制器的第二電壓引腳連接於該第三及第四電阻之間的節點，該熱交換控制器的定時引腳透過該第一電容接地，該熱交換控制器的電源控制引腳透過該第五電阻接地，該熱交換控制器的電源準備好引腳透過該第六電阻連接於該風扇電路及該熱交換控制器的輸出引腳，該熱交換控制器的控制引腳連接於該第一電子開關的控制端，該電子開關的第一端連接於該第一電阻的第一端，該電子開關的第二端連接該熱交換控制器的輸出引腳，該第二電容連接在該熱交換控制器的輸出引腳與地之間；該熱交換控制器的感測引腳及輸入引腳用於偵測該第一電阻兩端的電壓差，進而得到透過第一電阻的電流值，該熱交換控制器將所得到的電流值與風扇正常工作所對應的預設電流值進行比較，當該電流值不大於該預設電流值時，該熱交換控制器的控制引腳輸出高電平訊號，當該電流值大於該預設電流值時，該熱交換控制器的控制引腳輸出低電平訊號；當該電子開關的控制端接收高電平訊號時，該電子開關的第一端與第二端導通，當該電子開關的控制端接收低電平訊號時，該電子開關的第一端與第二端斷開。A fan with an overcurrent protection function includes a fan protection circuit, a fan connector and a fan circuit. The fan protection circuit includes a heat exchange controller, an electronic switch, first to sixth resistors, and first and second a second capacitor, a sensing pin of the heat exchange controller is connected to the first end of the first resistor, and a second end of the first resistor is connected to a power pin of the fan connector, and a power pin of the fan connector Also directly connected to the input pin of the heat exchange controller, the input pin of the heat exchange controller is further connected to the first voltage pin of the heat exchange controller through the second resistor, the heat exchange controller a voltage pin is also grounded through the third resistor and the fourth resistor in sequence, and a second voltage pin of the heat exchange controller is connected to a node between the third and fourth resistors, and the heat exchange controller The timing pin is grounded through the first capacitor, and the power control pin of the heat exchange controller is grounded through the fifth resistor, and the power supply ready pin of the heat exchange controller is connected to the fan circuit through the sixth resistor and An output pin of the heat exchange controller, the control pin of the heat exchange controller is connected to the control end of the first electronic switch, and the first end of the electronic switch is connected to the first end of the first resistor, the electronic switch The second end is connected to the output pin of the heat exchange controller, and the second capacitor is connected between the output pin of the heat exchange controller and the ground; the sensing pin and the input pin of the heat exchange controller are used Detecting a voltage difference across the first resistor to obtain a current value that is transmitted through the first resistor, and the heat exchange controller compares the obtained current value with a preset current value corresponding to a normal operation of the fan, when the current is When the value is not greater than the preset current value, the control pin of the heat exchange controller outputs a high level signal, and when the current value is greater than the preset current value, the control pin of the heat exchange controller outputs a low level. When the control end of the electronic switch receives the high level signal, the first end and the second end of the electronic switch are turned on, and when the control end of the electronic switch receives the low level signal, the first end of the electronic switch With the second end Open. 如申請專利範圍第1項所述之具有過流保護功能的風扇，其中該電子開關為N溝道場效應電晶體，該電子開關的控制端、第一端及第二端分別對應N溝道場效應電晶體的閘機、汲極及源極。
The fan with overcurrent protection function according to claim 1, wherein the electronic switch is an N-channel field effect transistor, and the control terminal, the first end and the second end of the electronic switch respectively correspond to an N-channel field effect The gate, drain and source of the transistor.