TWM539183U - Automatic braking circuit for power-off of fan motor - Google Patents

Automatic braking circuit for power-off of fan motor Download PDF

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Publication number
TWM539183U
TWM539183U TW105219599U TW105219599U TWM539183U TW M539183 U TWM539183 U TW M539183U TW 105219599 U TW105219599 U TW 105219599U TW 105219599 U TW105219599 U TW 105219599U TW M539183 U TWM539183 U TW M539183U
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Taiwan
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resistor
electrically connected
arm switch
unit
upper arm
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TW105219599U
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Chinese (zh)
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Hu Zhang
xi-sheng Jiang
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Asia Vital Components Co Ltd
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Priority to TW105219599U priority Critical patent/TWM539183U/en
Publication of TWM539183U publication Critical patent/TWM539183U/en

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Description

風扇馬達斷電自動煞車之電路Fan motor power failure automatic brake circuit

本創作有關於一種風扇馬達斷電自動煞車之電路，尤指一種具有自動煞車功能之風扇馬達斷電自動煞車之電路。This creation relates to a circuit in which a fan motor is powered off and automatically braked, and in particular, a circuit in which a fan motor with an automatic braking function is powered off and automatically brakes.

近年來，利用數位微控制器(Micro-Controller Unit,MCU)結合電力電子開關驅動電路，進行電子產品之設計，已是目前業界常用的技術。然而，在操作該電子產品時，該數位微控制器及該電力電子開關會因為操作在高頻而導致該電子產品產生大量熱量；因此，該電子產品之散熱需求將成為相當重要的設計課題。 目前，較常見的散熱方式係以風扇系統之運轉進行該電子產品之驅風散熱，然而基於風扇控制及使用者安全操作之考量，該風扇系統通常會結合一煞車電路，以便在電源斷電時，停止該風扇系統之運轉，以確保風扇控制之精確性及使用者之操作安全。        參閱第1圖示，一般習知風扇煞車電路1包含橋式驅動器11、一控制器13、一煞車電路14及一馬達線圈L，一輸入電源Vin連接至該橋式驅動器11、控制器13及該煞車電路14以提供上述該等構件之電源所需，並該橋式驅動器11由二上臂開關M1、M2與二下臂開關M3、M4所構成，所以當風扇斷電時，是透過該煞車電路14的控制，以進行即時停止運轉之操作來達到煞車的效果。但由於習知風扇煞車電路1中需將該控制器13對二下臂開關M3、M4在做脈衝寬度調變信號(PULSE WIDTH MODULATION；PWM)切割控制，改為控制器13對二上臂開關M1、M2來做脈衝寬度調變信號切割控制，可是會使二上臂開關M1、M2與控制電阻溫度上升，所以必須得增加電子元件(如電阻器)來處理解決上述溫度上升的問題，且二下臂開關M3、M4是與該煞車電路14相電性連接，勢必會因為該煞車電路14之設置，而導致成本增加與增加電路連接複雜度。In recent years, the use of digital-based microcontrollers (MCUs) combined with power electronic switch drive circuits for electronic product design has become a common technology in the industry. However, when the electronic product is operated, the digital microcontroller and the power electronic switch may generate a large amount of heat due to the high frequency operation; therefore, the heat dissipation requirement of the electronic product will become a very important design issue. At present, the more common heat dissipation method is to drive the heat of the electronic product by the operation of the fan system. However, based on the fan control and the safe operation of the user, the fan system usually combines a brake circuit so that when the power is cut off. Stop the operation of the fan system to ensure the accuracy of the fan control and the safety of the user. Referring to FIG. 1 , a conventional fan brake circuit 1 includes a bridge driver 11 , a controller 13 , a brake circuit 14 , and a motor coil L . An input power source Vin is connected to the bridge driver 11 , the controller 13 , and The braking circuit 14 is required to provide power for the above-mentioned components, and the bridge driver 11 is composed of two upper arm switches M1 and M2 and two lower arm switches M3 and M4, so when the fan is powered off, the brake is transmitted through the brake. The control of the circuit 14 is performed to perform an immediate stop operation to achieve the effect of braking. However, in the conventional fan brake circuit 1, the controller 13 is required to perform the pulse width modulation signal (PULSE WIDTH MODULATION; PWM) cutting control on the two lower arm switches M3, M4, and is changed to the controller 13 to the upper arm switch M1. M2 is used for pulse width modulation signal cutting control, but the temperature of the upper arm switches M1 and M2 and the control resistor is increased. Therefore, it is necessary to increase the electronic components (such as resistors) to solve the above problem of temperature rise, and the second The arm switches M3 and M4 are electrically connected to the braking circuit 14, which is bound to increase the cost and increase the circuit connection complexity due to the setting of the braking circuit 14.

爰此，為有效解決上述之問題，本創作之一目的在提供一種透過一電阻單元使電路帶有煞車功能，且藉由一儲能單元於斷電時提供一操作電壓給一馬達驅動電路的複數上臂開關組件，令該等上臂開關組件與一馬達線圈形成一封閉迴路而達到煞車的效果的風扇馬達斷電自動煞車之電路。        本創作之另一目的在提供一種具有達到節省成本的風扇馬達斷電自動煞車之電路。        為達上述目的，本創作係在提供一種風扇馬達斷電自動煞車之電路，係包括一儲能單元、一馬達驅動電路、一控制單元及一電阻單元，該儲能單元接收並儲存一操作電壓，該馬達驅動電路具有複數上臂開關組件、複數下臂開關組件、一第一驅動單元及一第二驅動單元，該等上臂開關組件的一第一端電性連接該儲能單元且接收該操作電壓，其一第二端分別與相對該等下臂開關組件的一第一端及該馬達線圈相電性連接，該等下臂開關組件的一第二端則連接至一接地端，並該第一、二驅動單元的一第一端分別電性連接相對該等上臂開關組件的一第三端，而控制單元係電性連接相對該等下臂開關的一第三端與該第一、二驅動單元的一第二端，並該電阻單元的一端電性連接一輸入電源，其另一端電性連接相對該第一、二驅動單元的一第三端，並該第一、二驅動單元的一第四端電性連接該接地端，其中當該風扇斷電時，該等上臂開關組件接收到該儲能單元提供的該操作電壓而導通，該等下臂開關組件無接收到該操作電壓而不導通，令該等上臂開關組件與該馬達線圈形成一封閉迴路而達到煞車的效果，且還有效達到節省成本的效果。         在一實施，該等上臂開關組件具有一第一上臂開關組件與一第二上臂開關組件，該第一、二上臂開關件的該第一端與該儲能單元相電性連接，該第一、二上臂開關組件的該第二端分別電性連接相對該馬達線圈的兩端，該第一、二上臂開關組件的該第三端分別電性連接相對該第一、二驅動單元的該第一端。         在一實施，該等下臂開關組件具有一第一下臂開關組件與一第二下臂開關組件，該第一、二下臂開關組件的該第一端分別電性連接相對該馬達線圈的兩端，該第一、二下臂開關組件的第二端分別電性連接至該接地端，該第一、二下臂開關組件的第三端分別電性連接相對該控制單元。         在一實施，該電阻單元為一電阻器，該電阻單元的一端電性連接該輸入電源，該電阻單元的另一端與相對該第一、二驅動單元的該第三端相電性連接。         在一實施，該控制單元為一中央處理器或一微控制器。         在一實施，該第一驅動單元包含一第一電晶體、一第一電阻器、一第二電阻器、一第三電阻器、一第四電阻器及一第一電容器，該第一電晶體具有一基極、一射極及一集極， 該集極電性連接該第二電阻器的一端，該射極電性連接該第三電阻器的一端與該接地端，該第三電阻器的另一端與該第一電容器的一端、該第一電阻器的一端、該第二電阻器的另一端及該第一上臂開關組件的該第三端共同相電性連接，且該第一電阻器與第一電容器的另一端連接相對該電阻單元的另一端，該第四電阻器的一端電性連接該基極，其另一端電性連接相對該控制單元。         在一實施，該第二驅動單元包含一第二電晶體、一第五電阻器、一第六電阻器、一第七電阻器、一第八電阻器及一第二電容器，該第二電晶體具有一基極、一射極及一集極， 該第二電晶體的該集極電性連接該第七電阻器的一端，該第二電晶體的該射極電性連接該第六電阻器的一端與該接地端，該第六電阻器的另一端與該第二電容器的一端、該第五電阻器的一端、該第七電阻器的另一端及該第二上臂開關組的該第三端共同相電性連接，且該第五電阻器與第二電容器的另一端連接相對該電阻單元的另一端，該第八電阻器的一端電性連接該第二電晶體的該基極，其另一端電性連接相對該控制單元。         在一實施，該電阻單元為0歐姆電阻器。Therefore, in order to effectively solve the above problems, one of the purposes of the present invention is to provide a braking function for a circuit through a resistor unit, and to provide an operating voltage to a motor driving circuit when an energy storage unit is powered off. A plurality of upper arm switch assemblies, such that the upper arm switch assembly and a motor coil form a closed loop to achieve the effect of braking, and the fan motor is powered off and automatically brakes the circuit. Another object of the present invention is to provide a circuit for achieving a cost-saving fan motor power-off automatic braking. In order to achieve the above object, the present invention provides a circuit for a fan motor to be powered off automatically, comprising an energy storage unit, a motor drive circuit, a control unit and a resistor unit, and the energy storage unit receives and stores an operating voltage. The motor drive circuit has a plurality of upper arm switch assemblies, a plurality of lower arm switch assemblies, a first drive unit, and a second drive unit, and a first end of the upper arm switch assemblies is electrically connected to the energy storage unit and receives the operation a second end of the voltage is electrically connected to a first end of the lower arm switch assembly and the motor coil, and a second end of the lower arm switch assembly is connected to a ground end, and A first end of the first and second driving units are electrically connected to a third end of the upper arm switch assembly, and the control unit is electrically connected to a third end of the lower arm switch and the first end, a second end of the second driving unit, and one end of the resistor unit is electrically connected to an input power source, and the other end of the resistor unit is electrically connected to a third end of the first and second driving units, and the first end A fourth end of the first and second driving units is electrically connected to the grounding end, wherein when the fan is powered off, the upper arm switch assembly receives the operating voltage provided by the energy storage unit and is turned on, and the lower arm switch assembly The operation voltage is not received and is not turned on, so that the upper arm switch assembly and the motor coil form a closed loop to achieve the braking effect, and the cost saving effect is also effectively achieved. In one implementation, the upper arm switch assembly has a first upper arm switch assembly and a second upper arm switch assembly, the first end of the first and second upper arm switch members being electrically connected to the energy storage unit, the first The second ends of the two upper arm switch assemblies are electrically connected to opposite ends of the motor coil, and the third ends of the first and second upper arm switch assemblies are electrically connected to the first and second driving units respectively. One end. In one implementation, the lower arm switch assembly has a first lower arm switch assembly and a second lower arm switch assembly, and the first ends of the first and second lower arm switch assemblies are electrically connected to the motor coils respectively The second ends of the first and second lower arm switch assemblies are electrically connected to the ground end, and the third ends of the first and second lower arm switch assemblies are electrically connected to the control unit respectively. In one implementation, the resistor unit is a resistor, and one end of the resistor unit is electrically connected to the input power source, and the other end of the resistor unit is electrically connected to the third end of the first and second driving units. In one implementation, the control unit is a central processing unit or a microcontroller. In one implementation, the first driving unit includes a first transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor, the first transistor Having a base, an emitter, and a collector, the collector is electrically connected to one end of the second resistor, the emitter is electrically connected to one end of the third resistor and the ground, the third resistor The other end is electrically connected to one end of the first capacitor, one end of the first resistor, the other end of the second resistor, and the third end of the first upper arm switch assembly, and the first resistor The other end of the first capacitor is connected to the other end of the resistor unit. One end of the fourth resistor is electrically connected to the base, and the other end of the fourth resistor is electrically connected to the control unit. In one implementation, the second driving unit includes a second transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a second capacitor, the second transistor Having a base, an emitter, and a collector, the collector of the second transistor is electrically connected to one end of the seventh resistor, and the emitter of the second transistor is electrically connected to the sixth resistor One end of the sixth resistor and one end of the second capacitor, one end of the fifth resistor, the other end of the seventh resistor, and the third end of the second upper arm switch group The other end of the second resistor is electrically connected to the other end of the second resistor, and the other end of the second resistor is electrically connected to the base of the second transistor. The other end is electrically connected to the control unit. In one implementation, the resistor unit is a 0 ohm resistor.

本創作之上述目的及其結構與功能上的特性，將依據所附圖式之較佳實施例予以說明。         本創作係提供一種風扇馬達斷電自動煞車之電路2，請參閱第2、3圖示，係顯示本創作之較佳實施例之方塊與電路示意圖；該風扇馬達斷電自動煞車之電路2係應用在一風扇(如軸流風扇或離心風扇；圖中未示)上，該電路2包括一儲能單元21、一馬達驅動電路22、一控制單元24及一電阻單元25，該儲能單元21在本實施例表示為一電容器，該儲能單元21用以接收並儲存一操作電壓Vcc (如12伏特)，而該馬達驅動電路22具有複數上臂開關組件、複數下臂開關組件、一第一驅動單元225及一第二驅動單元226，該等上臂開關組件在本實施例表示為2個上臂開關組件，該等上臂開關組件具有一第一上臂開關組件221與一第二上臂開關組件222，該第一、二上臂開關組件221、222各具有一第一端2211、2221、一第二端2212、2222及一第三端2213、2223，並該第一、二上臂開關件221、222的第一端2211、2221 (即該等上臂開關組件的第一端2211、2221)與相對該儲能單元21相電性連接且接收該操作電壓Vcc，該第一、二上臂開關組件221、222的第二端2212、2222(該等上臂開關組件的第二端2212、2222)與相對該馬達線圈L的兩端相電性連接，該第一、二上臂開關組件221、222的第三端2213、2223(即該等上臂開關組件的第三端2213、2223)分別電性連接相對該第一驅動單元225的一第一端2251與該第二驅動單元226的一第一端2261。         而該等下臂開關組件在本實施例表示為2個下臂開關組件，該等下臂開關組件具有一第一下臂開關組件223與一第二下臂開關組件224，該第一、二下臂開關組件223、224各具有一第一端2231、2241、一第二端2232、2242及一第三端2233、2243，該第一、二下臂開關組件223、224的第一端2231、2241 (該等下開關組件的第一端2231、2241)分別電性連接相對該第一、二上臂開關組件221、222的第二端2212、2222，該第一、二下臂開關組件223、224的第二端2232、2242 (該等下開關組件的第二端2232、2242)則連接至一接地端GND，並該第一、二下臂開關組件223、224的第三端2233、2243 (該等下臂關組件的第三端2233、2243)分別電性連接相對該控制單元24。前述第一、二驅動單元225、226各具有前述第一端2251、2261、一第二端2252、2262、一第三端2253、2263及一第四端2254、2264，該第一、二驅動單元225、226的第一端2251、2261分別電性連接相對該等上臂開關組件的第三端2213、2223，該第一、二驅動單元225、226的第二端2252、2262分別電性連接相對該控制單元24，該第一、二驅動單元225、226的第三端2253、2263電性連接相對該電阻單元25的另一端，該第一、二驅動單元225、226的第四端2254、2264電性連接該接地端GND，並該電阻單元25的一端電性連接一輸入電源Vin，該輸入電源Vin (如12伏特)用以提供電源。         另者，前述電阻單元25為一電阻器，在本實施例表示電阻單元25為0歐姆電阻器。前述控制單元24為一中央處理器(Central Processing Unit，CPU)或一微控制器(Micro control unit，MCU)，且該控制單元24具有複數接腳，其中該控制單元24的四隻接腳分別連接對應該第一、二驅動單元225、226的第二端2252、2262及該第一、二下臂開關組件223、224的第三端2233、2243，且前述控制單元24的四隻接腳用以輸出一脈衝寬度調變(Pulse Width Modulation；PWM)信號控制該第一、二驅動單元225、226分別驅動對應的第一、二上臂開關組件221、222的開關動作(如開關為導通或開關為不導通)與控制該第一、二下臂開關組件223、224的開關動作(如開關為導通或開關為不導通)，而該控制單元24的另一接腳(如第五接腳)則電性連接一霍爾元件(圖中未示)，用以接收霍爾元件傳送的霍爾訊號，該控制單元24的另一接腳(如第六接腳)則接收一工作電壓Vs (如5伏特)。所以透過本創作之前述電阻單元25使電路帶有煞車功能，並藉由該儲能單元21於斷電時提供該操作電壓Vcc給該馬達驅動電路22的第一、二上臂開關組件221、222而導通，令該第一、二上臂開關組件221、222與馬達線圈L的兩端短路形成一封閉迴路而達到煞車的效果。藉由本創作的電路2設計，當風扇斷電後，風扇的扇葉會因本身之慣性作用而旋轉(或運轉)，且根據法拉第電磁感應定律(Faraday's law)，使封閉迴路上的馬達線圈L為閉合線圈而產生感應電流，此感應電流將使馬達線圈L產生一個反向磁場阻止扇葉運轉，讓風扇可很快停止達到剎車的效果。         續請參閱第3圖示，將就各結構詳細說明：         前述第一驅動單元225包含一第一電晶體Q1、一第一電阻器R1、一第二電阻器R2、一第三電阻器R3、一第四電阻器R4及一第一電容器C1，該第一電晶體Q1在本實施例表示為BJT (Bipolar Junction Transistor)電晶體，該第一電晶體Q1具有一基極、一射極及一集極，該第一電晶體Q1之集極電性連接該第二電阻器R2的一端，該第一電晶體Q1之射極電性連接該第三電阻器R3的一端與該接地端GND，該第三電阻器R3的另一端(即該第一驅動單元225的第一端2251)與該第一電容器C1的一端、該第一電阻器R1的一端、該第二電阻器R2的另一端及該第一上臂開關組件221的該第三端2213共同相電性連接，且該第一電阻器R1的另一端與第一電容器C1的另一端共同連接相對該電阻單元25的另一端，該第四電阻器R4的一端電性連接該第一電晶體Q1之基極，其另一端電性連接相對該控制單元24的一接腳(如第一接腳)。         並該第二驅動單元226包含一第二電晶體Q2、一第五電阻器R5、一第六電阻器R6、一第七電阻器R7、一第八電阻器R8及一第二電容器C2，該第二電晶體Q2具有一基極、一射極及一集極， 該第二電晶體Q2的集極電性連接該第七電阻器R7的一端，該第二電晶體Q2的射極電性連接該第六電阻器R6的一端與該接地端GND，該第六電阻器R6的另一端(即該第二驅動單元226的第一端2261)與該第二電容器C2的一端、該第五電阻器R5的一端、該第七電阻器R7的另一端及該第二上臂開關組222的該第三端2223共同相電性連接，且該第五電阻器R5的另一端與第二電容器C2的另一端共同連接相對前述電阻單元25的另一端，該第八電阻器R8的一端電性連接該第二電晶體Q2的基極，其另一端電性連接相對該控制單元24的另一接腳(如第二接腳)。         前述第一上臂開關組件221包含一第一上MOS電晶體M1，該第二上臂開關組件222包含一第二上MOS電晶體M2，該第一、二上MOS電晶體M1、M2在本實施例表示為一P型金氧半場效(PMOS) 電晶體，並該第一、二上MOS電晶體M1、M2的源極(即該第一、二上臂開關組件221、222的第一端2211、2221)共同連接相對該儲能單元21的一端(即該儲能單元21的正極)，該儲能單元21的另一端(即該儲能單元21的負極)電性連接該接地端GND，其中該儲能單元21電性連接一整流穩壓電路(圖中未示)，前述整流穩壓電路將接收到的輸入電源Vin (如12伏特)經整流穩壓後輸出該操作電壓Vcc (如12伏特)給該儲能單元21，而該第一、二上MOS電晶體M1、M2的閘極(即該第一、二上臂開關組件的第三端2213、2223)分別電性連接對應的該第一、二電容器C1、C2的一端。而該第一下臂開關組件223包含一第一下MOS電晶體M3、一第九電阻器R9、一第十電阻器R10及一第三電容器C3，該第一下MOS電晶體M3在本實施例表示為一N型金氧半場效(NMOS) 電晶體，該第一下MOS電晶體M3的汲極(即該第一下臂開關組件223的第一端2231)電性連接對應該第一上MOS電晶體M1的汲極(即該第一上臂開關組件的第二端2212)及該馬達線圈L的一端，該第一下MOS電晶體M3的閘極電性連接該第九、十電阻器R9、R10的一端及第三電容器C3的一端，該第三電容器C3的另一端與該第十電阻的另一端及該接地端GND共同電性連接一起，該第九電阻器R9的另一端(即該第一下臂開關組件223的第三端2233)連接對應該控制單元24的另一接腳(如第三接腳)。         另者，前述該第二下臂開關組件224包含一第二下MOS電晶體M4、一第十一電阻器R11、一第十二電阻器R12及一第四電容器C4，該第二下MOS電晶體M4在本實施例表示為一N型金氧半場效(NMOS) 電晶體，該第二下MOS電晶體M4的汲極(即該第二下臂開關組件224的第一端2241)電性連接對應該第二上MOS電晶體M2的汲極(即該第二上臂開關組件222的第二端2222)及馬達線圈L的另一端，該第二下MOS電晶體M4的閘極電性連接該第十一、十二電阻器R11、R12的一端及第四電容器C4的一端，該第四電容器C4的另一端與該第十二電阻的另一端及該接地端GND共同電性連接一起，該第十一電阻器R11的另一端(即該第二下臂開關組件224的第三端2243)連接對應該控制單元24的另一接腳(如第四接腳)，並該第一、二下MOS電晶體M3、M4的源極(即該第二下臂開關組件224的第二端2242)與一第十三電阻器R13的一端相電性連接，該第十三電阻器R13的另一端電性連接該接地端GND。 所以當風扇要啟動時，該馬達驅動電路22可接收到輸入電源Vin，並藉由該控制單元24輸出的PWM信號控制該第一、二驅動單元225、226分別驅動對應的第一、二上MOS電晶體M1、M2的開關動作以及控制該第一、二下MOS電晶體M3、M4的開關動作，藉以達到控制風扇運轉與風扇轉速，同時該儲能單元21會將接收到的操作電壓Vcc儲存(即儲能單元21被充電)；若當風扇斷電時，前述控制單元24未接收到該工作電壓Vs而不能工作，相對該控制單元24中輸出PWM信號的四隻接腳電位為0伏特，使該第一、二驅動單元225、226的第一、二電晶體Q1、Q2、該第一、二下MOS電晶體M3、M4也均不導通，此時該第一、二上MOS電晶體M1、M2的閘極各自通過相對該第三、六電阻器R3、R6與儲能單元的負極相連接而下拉為低電位(即0伏特)，並同時該儲能單元21所儲存的操作電壓Vcc(即12伏特)會提供給該第一、二上MOS電晶體M1、M2的源極，使該第一、二上MOS電晶體M1、M2的源極電壓經儲能單元21放電為高電位為12伏特，此時該第一、二上MOS電晶體M1、M2的源極與閘極間的電壓為負12伏特(-12V)，同時該第一、二上MOS電晶體M1、M2導通(即該第一、二上MOS電晶體M1、M2的源極與汲極導通)，使該第一、二上MOS電晶體M1、M2與馬達線圈L兩端短路形成封閉迴路，因風扇斷電後之扇葉本身慣性作用而運轉，使封閉迴路上的馬達線圈L中產生感應電流，此感應電流將使馬達線圈L產生一個反向磁場阻止扇葉運轉，讓風扇可很快停止達到煞車的效果。         因此，藉由本創作之輸入電源Vin與第一電阻器R1的另一端間串聯該電阻單元25及該第一電容器C1的另一端與操作電壓Vcc間不串聯一個電阻器的電路結構設計，使電路2帶有煞車功能，且藉由該儲能單元21於斷電時提供操作電壓Vcc給該馬達驅動電路22的第一、二上臂開關組件221、222而導通，令該第一、二上臂開關組件221、222與馬達線圈L形成封閉迴路進而達到煞車的效果。另外，透過本創作此電路2的設計，使得可有效改善習知馬達煞車電路的下臂開關組件需要額外加入更多電子元件來實現煞車，故本創作可有效達到節省成本的效果。The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings. The present invention provides a circuit 2 for fan motor power-off automatic braking. Please refer to the figures 2 and 3 for a block and circuit diagram of a preferred embodiment of the present invention; the fan motor is powered off and the circuit is automatically braked. Applied to a fan (such as an axial fan or a centrifugal fan; not shown), the circuit 2 includes an energy storage unit 21, a motor drive circuit 22, a control unit 24, and a resistor unit 25, the energy storage unit 21 is shown as a capacitor in the embodiment, the energy storage unit 21 is configured to receive and store an operating voltage Vcc (eg, 12 volts), and the motor driving circuit 22 has a plurality of upper arm switch components, a plurality of lower arm switch components, and a first A driving unit 225 and a second driving unit 226 are shown as two upper arm switching assemblies in the embodiment. The upper arm switching assemblies have a first upper arm switch assembly 221 and a second upper arm switch assembly 222. The first and second upper arm switch assemblies 221 and 222 each have a first end 2211, 2221, a second end 2212, 2222, and a third end 2213, 2223, and the first and second upper arm switch members 221, 2 The first ends 2211, 2221 of the 22 (ie, the first ends 2211, 2221 of the upper arm switch assemblies) are electrically connected to the energy storage unit 21 and receive the operating voltage Vcc, the first and second upper arm switch assemblies 221 The second ends 2212, 2222 of the 222 (the second ends 2212, 2222 of the upper arm switch assemblies) are electrically connected to opposite ends of the motor coil L, and the first and second upper arm switch assemblies 221, 222 The third end 2213, 2223 (ie, the third end 2213, 2223 of the upper arm switch assembly) is electrically connected to a first end 2251 of the first driving unit 225 and a first end 2261 of the second driving unit 226, respectively. . The lower arm switch assemblies are shown in the present embodiment as two lower arm switch assemblies having a first lower arm switch assembly 223 and a second lower arm switch assembly 224, the first and second The lower arm switch assemblies 223, 224 each have a first end 2231, 2241, a second end 2232, 2242, and a third end 2233, 2243. The first end 2231 of the first and second lower arm switch assemblies 223, 224 2241 (the first ends 2231, 2241 of the lower switch assemblies) are electrically connected to the second ends 2212, 2222 of the first and second upper arm switch assemblies 221, 222, respectively, the first and second lower arm switch assemblies 223 The second ends 2232, 2242 of the 224 (the second ends 2232, 2242 of the lower switch components) are connected to a ground GND, and the third ends 2233 of the first and second lower arm switch assemblies 223, 224, 2243 (the third ends 2233, 2243 of the lower arm closing assemblies) are electrically connected to the control unit 24, respectively. The first and second driving units 225 and 226 each have the first end 2251, 2261, a second end 2252, 2262, a third end 2253, 2263 and a fourth end 2254, 2264. The first and second driving The first ends 2251, 2261 of the units 225, 226 are electrically connected to the third ends 2213, 2223 of the upper arm switch assemblies, respectively, and the second ends 2252, 2262 of the first and second driving units 225, 226 are electrically connected The third ends 2253, 2263 of the first and second driving units 225, 226 are electrically connected to the other end of the resistor unit 25, and the fourth end 2254 of the first and second driving units 225, 226 is opposite to the control unit 24. 2264 is electrically connected to the ground GND, and one end of the resistor unit 25 is electrically connected to an input power source Vin, and the input power source Vin (such as 12 volts) is used to supply power. In addition, the resistor unit 25 is a resistor, and in the embodiment, the resistor unit 25 is a 0 ohm resistor. The control unit 24 is a central processing unit (CPU) or a micro control unit (MCU), and the control unit 24 has a plurality of pins, wherein the four pins of the control unit 24 respectively Connecting the second ends 2252, 2262 of the first and second driving units 225, 226 and the third ends 2233, 2243 of the first and second lower arm switch assemblies 223, 224, and the four pins of the foregoing control unit 24 The first and second driving units 225 and 226 respectively drive the switching operations of the corresponding first and second upper arm switching components 221 and 222 to output a pulse width modulation (PWM) signal (for example, the switch is turned on or The switch is non-conducting) and controlling the switching action of the first and second lower arm switch assemblies 223, 224 (eg, the switch is conducting or the switch is non-conducting), and the other pin of the control unit 24 (such as the fifth pin) And electrically connected to a Hall element (not shown) for receiving the Hall signal transmitted by the Hall element, and another pin of the control unit 24 (such as the sixth pin) receives an operating voltage Vs (such as 5 volts). Therefore, the circuit has a braking function through the foregoing resistor unit 25 of the present invention, and the operating voltage Vcc is supplied to the first and second upper arm switch assemblies 221, 222 of the motor driving circuit 22 when the energy storage unit 21 is powered off. Turning on, the first and second upper arm switch assemblies 221, 222 and the motor coil L are short-circuited to form a closed loop to achieve the braking effect. With the circuit 2 design of the present invention, when the fan is powered off, the fan blade rotates (or operates) due to its own inertia, and the motor coil L on the closed circuit is made according to Faraday's law. Inductive current is generated to close the coil. This induced current will cause the motor coil L to generate a reverse magnetic field to prevent the fan blade from running, so that the fan can quickly stop braking. Please refer to FIG. 3 for a detailed description of each structure. The first driving unit 225 includes a first transistor Q1, a first resistor R1, a second resistor R2, and a third resistor R3. a fourth resistor R4 and a first capacitor C1. The first transistor Q1 is represented as a BJT (Bipolar Junction Transistor) transistor in the embodiment, and the first transistor Q1 has a base, an emitter and a a collector, the collector of the first transistor Q1 is electrically connected to one end of the second resistor R2, and the emitter of the first transistor Q1 is electrically connected to one end of the third resistor R3 and the ground GND. The other end of the third resistor R3 (ie, the first end 2251 of the first driving unit 225) and one end of the first capacitor C1, one end of the first resistor R1, and the other end of the second resistor R2 The third end 2213 of the first upper arm switch assembly 221 is electrically connected in common, and the other end of the first resistor R1 is commonly connected with the other end of the first capacitor C1 with respect to the other end of the resistor unit 25. One end of the fourth resistor R4 is electrically connected to the first transistor The base of Q1 is electrically connected to a pin (such as a first pin) of the control unit 24. The second driving unit 226 includes a second transistor Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a second capacitor C2. The second transistor Q2 has a base, an emitter and a collector. The collector of the second transistor Q2 is electrically connected to one end of the seventh resistor R7, and the emitter of the second transistor Q2 is electrically connected. One end of the sixth resistor R6 is connected to the ground GND, the other end of the sixth resistor R6 (ie, the first end 2261 of the second driving unit 226) and one end of the second capacitor C2, the fifth One end of the resistor R5, the other end of the seventh resistor R7, and the third end 2223 of the second upper arm switch group 222 are electrically connected in common, and the other end of the fifth resistor R5 and the second capacitor C2 are electrically connected. The other end of the second resistor R8 is electrically connected to the other end of the second transistor Q2, and the other end of the eighth resistor R8 is electrically connected to the other end of the control unit 24 Foot (such as the second pin). The first upper arm switch assembly 221 includes a first upper MOS transistor M1, and the second upper arm switch unit 222 includes a second upper MOS transistor M2. The first and second upper MOS transistors M1 and M2 are in this embodiment. Expressed as a P-type MOSFET, and the sources of the first and second upper MOS transistors M1, M2 (ie, the first ends 2211 of the first and second upper arm switch assemblies 221, 222) 2221) is connected in common with one end of the energy storage unit 21 (ie, the positive pole of the energy storage unit 21), and the other end of the energy storage unit 21 (ie, the negative pole of the energy storage unit 21) is electrically connected to the ground GND, wherein The energy storage unit 21 is electrically connected to a rectifying and stabilizing circuit (not shown). The rectifying and stabilizing circuit rectifies and receives the input power supply Vin (such as 12 volts), and outputs the operating voltage Vcc (such as 12). The volts are given to the energy storage unit 21, and the gates of the first and second upper MOS transistors M1, M2 (ie, the third ends 2213, 2223 of the first and second upper arm switch assemblies) are electrically connected to the corresponding ones. One end of the first and second capacitors C1, C2. The first lower arm switch module 223 includes a first lower MOS transistor M3, a ninth resistor R9, a tenth resistor R10 and a third capacitor C3. The first lower MOS transistor M3 is in the implementation. The example is represented as an N-type MOSFET (NMOS) transistor, and the drain of the first lower MOS transistor M3 (ie, the first end 2231 of the first lower arm switch component 223) is electrically connected to the first The drain of the upper MOS transistor M1 (ie, the second end 2212 of the first upper arm switch assembly) and one end of the motor coil L, the gate of the first lower MOS transistor M3 is electrically connected to the ninth and tenth resistors One end of the R9, R10 and one end of the third capacitor C3, the other end of the third capacitor C3 is electrically connected together with the other end of the tenth resistor and the ground GND, and the other end of the ninth resistor R9 That is, the third end 2233 of the first lower arm switch assembly 223 is connected to another pin (such as the third pin) corresponding to the control unit 24. In addition, the second lower arm switch assembly 224 includes a second lower MOS transistor M4, an eleventh resistor R11, a twelfth resistor R12 and a fourth capacitor C4, and the second lower MOS device The crystal M4 is represented as an N-type metal oxide half field effect (NMOS) transistor in this embodiment, and the drain of the second lower MOS transistor M4 (ie, the first end 2241 of the second lower arm switch assembly 224) is electrically Connecting the drain of the second upper MOS transistor M2 (ie, the second end 2222 of the second upper arm switch assembly 222) and the other end of the motor coil L, the gate of the second lower MOS transistor M4 is electrically connected One end of the eleventh and twelfth resistors R11 and R12 and one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is electrically connected together with the other end of the twelfth resistor and the ground GND. The other end of the eleventh resistor R11 (ie, the third end 2243 of the second lower arm switch assembly 224) is connected to another pin (such as the fourth pin) corresponding to the control unit 24, and the first The source of the second MOS transistor M3, M4 (ie, the second end 2242 of the second lower arm switch assembly 224) and a thirteenth resistor R13 One end electrically connected to the other terminal of the thirteenth resistor R13 is connected to the ground terminal GND. Therefore, when the fan is to be started, the motor driving circuit 22 can receive the input power source Vin, and control the first and second driving units 225 and 226 to drive the corresponding first and second respectively by the PWM signal outputted by the control unit 24. The switching operation of the MOS transistors M1 and M2 and the switching operation of the first and second MOS transistors M3 and M4 are performed to control the fan operation and the fan rotation speed, and the energy storage unit 21 receives the received operating voltage Vcc. The storage (ie, the energy storage unit 21 is charged); if the control unit 24 does not receive the operating voltage Vs and fails to operate when the fan is powered off, the four pin potentials of the PWM signal outputted from the control unit 24 are 0. Volts, the first and second transistors Q1, Q2, the first and second lower MOS transistors M3, M4 of the first and second driving units 225, 226 are also non-conducting, at this time, the first and second MOS The gates of the transistors M1 and M2 are respectively pulled down to a low potential (ie, 0 volts) by being connected to the negative electrodes of the energy storage unit with respect to the third and sixth resistors R3 and R6, and simultaneously stored by the energy storage unit 21. Operating voltage Vcc (ie 12 volts) will be provided to the first The sources of the two upper MOS transistors M1 and M2 are such that the source voltages of the first and second upper MOS transistors M1 and M2 are discharged through the energy storage unit 21 to a high potential of 12 volts. The voltage between the source and the gate of the MOS transistors M1 and M2 is minus 12 volts (-12 V), and the first and second upper MOS transistors M1 and M2 are turned on (ie, the first and second upper MOS transistors M1) The source and the drain of the M2 are turned on, so that the first and second upper MOS transistors M1 and M2 and the motor coil L are short-circuited at both ends to form a closed loop, and the blade itself is operated by the inertia of the fan after the power is turned off, so that An induced current is generated in the motor coil L on the closed circuit. This induced current will cause the motor coil L to generate a reverse magnetic field to prevent the fan blade from running, so that the fan can quickly stop reaching the braking effect. Therefore, the circuit structure design in which the resistor unit 25 and the other end of the first capacitor C1 are not connected in series with the operating voltage Vcc by the input power source Vin of the present invention and the other end of the first resistor R1, so that the circuit is designed 2 with a braking function, and the operating voltage Vcc is supplied to the first and second upper arm switch assemblies 221, 222 of the motor drive circuit 22 when the energy storage unit 21 is powered off, so that the first and second upper arm switches are turned on. The components 221, 222 and the motor coil L form a closed loop to achieve the effect of braking. In addition, through the design of the circuit 2 of the present invention, the lower arm switch assembly of the conventional motor brake circuit can be effectively improved by adding more electronic components to realize the brake, so the creation can effectively achieve the cost-saving effect.

2‧‧‧風扇馬達斷電自動煞車之電路
21‧‧‧儲能單元
22‧‧‧馬達驅動電路
221‧‧‧第一上臂開關組件
222‧‧‧第二上臂開關組件
2211、2221‧‧‧第一端
2212、2222‧‧‧第二端
2213、2223‧‧‧第三端
223‧‧‧第一下臂開關組件
224‧‧‧第二下臂開關組件
2231、2241‧‧‧第一端
2232、2242‧‧‧第二端
2233、2243‧‧‧第三端
225‧‧‧第一驅動單元
226‧‧‧第二驅動單元
2251、2261‧‧‧第一端
2252、2262‧‧‧第二端
2253、2263‧‧‧第三端
2254、2264‧‧‧第四端
24‧‧‧控制單元
25‧‧‧電阻單元
L‧‧‧馬達線圈
Vin‧‧‧輸入電源
Vcc‧‧‧操作電壓
Vs‧‧‧工作電壓
GND‧‧‧接地端
M1‧‧‧第一上MOS電晶體
M2‧‧‧第二上MOS電晶體
M3‧‧‧第一下MOS電晶體
M4‧‧‧第二下MOS電晶體
Q1‧‧‧第一電晶體
Q2‧‧‧第二電晶體
R1‧‧‧第一電阻器
R2‧‧‧第二電阻器
R3‧‧‧第三電阻器
R4‧‧‧第四電阻器
R5‧‧‧第五電阻器
R6‧‧‧第六電阻器
R7‧‧‧第七電阻器
R8‧‧‧第八電阻器
R9‧‧‧第九電阻器
R10‧‧‧第十電阻器
R11‧‧‧第十一電阻器
R12‧‧‧第十二電阻器
R13‧‧‧第十三電阻器
C1‧‧‧第一電容器
C2‧‧‧第二電容器
C3‧‧‧第三電容器
C4‧‧‧第四電容器2‧‧‧Circuit motor power failure automatic brake circuit
21‧‧‧ Energy storage unit
22‧‧‧Motor drive circuit
221‧‧‧First upper arm switch assembly
222‧‧‧Second upper arm switch assembly
2211, 2221‧‧‧ first end
2212, 2222‧‧‧ second end
2213, 2223‧‧‧ third end
223‧‧‧First lower arm switch assembly
224‧‧‧Second lower arm switch assembly
2231, 2241‧‧‧ first end
2232, 2242‧‧‧ second end
2233, 2243‧‧‧ third end
225‧‧‧First drive unit
226‧‧‧Second drive unit
2251, 2261‧‧‧ first end
2252, 2262‧‧‧ second end
2253, 2263‧‧‧ third end
2254, 2264‧‧‧ fourth end
24‧‧‧Control unit
25‧‧‧Resistor unit
L‧‧‧Motor coil
Vin‧‧‧Input power supply
Vcc‧‧‧ operating voltage
Vs‧‧‧ working voltage
GND‧‧‧ ground terminal
M1‧‧‧First MOS transistor
M2‧‧‧Second upper MOS transistor
M3‧‧‧First MOS transistor
M4‧‧‧Second MOS transistor
Q1‧‧‧First transistor
Q2‧‧‧Second transistor
R1‧‧‧ first resistor
R2‧‧‧second resistor
R3‧‧‧ third resistor
R4‧‧‧ fourth resistor
R5‧‧‧ fifth resistor
R6‧‧‧ sixth resistor
R7‧‧‧ seventh resistor
R8‧‧‧ eighth resistor
R9‧‧‧ ninth resistor
R10‧‧‧10th Resistor
R11‧‧‧Eleventh Resistor
R12‧‧‧12th resistor
R13‧‧‧13th resistor
C1‧‧‧First Capacitor
C2‧‧‧second capacitor
C3‧‧‧ third capacitor
C4‧‧‧fourth capacitor

第1圖係習知之風扇煞車電路電路示意圖。 第2圖係本創作之一實施例之方塊示意圖。 第3圖係本創作之一實施例之電路示意圖。Figure 1 is a schematic diagram of a conventional circuit of a fan brake circuit. Figure 2 is a block diagram of one embodiment of the present invention. Figure 3 is a circuit diagram of one embodiment of the present invention.

2‧‧‧風扇馬達斷電自動煞車之電路 2‧‧‧Circuit motor power failure automatic brake circuit

21‧‧‧儲能單元 21‧‧‧ Energy storage unit

22‧‧‧馬達驅動電路 22‧‧‧Motor drive circuit

221‧‧‧第一上臂開關組件 221‧‧‧First upper arm switch assembly

222‧‧‧第二上臂開關組件 222‧‧‧Second upper arm switch assembly

2211、2221‧‧‧第一端 2211, 2221‧‧‧ first end

2212、2222‧‧‧第二端 2212, 2222‧‧‧ second end

2213、2223‧‧‧第三端 2213, 2223‧‧‧ third end

223‧‧‧第一下臂開關組件 223‧‧‧First lower arm switch assembly

224‧‧‧第二下臂開關組件 224‧‧‧Second lower arm switch assembly

2231、2241‧‧‧第一端 2231, 2241‧‧‧ first end

2232、2242‧‧‧第二端 2232, 2242‧‧‧ second end

2233、2243‧‧‧第三端 2233, 2243‧‧‧ third end

225‧‧‧第一驅動單元 225‧‧‧First drive unit

226‧‧‧第二驅動單元 226‧‧‧Second drive unit

2251、2261‧‧‧第一端 2251, 2261‧‧‧ first end

2252、2262‧‧‧第二端 2252, 2262‧‧‧ second end

2253、2263‧‧‧第三端 2253, 2263‧‧‧ third end

2254、2264‧‧‧第四端 2254, 2264‧‧‧ fourth end

24‧‧‧控制單元 24‧‧‧Control unit

25‧‧‧電阻單元 25‧‧‧Resistor unit

L‧‧‧馬達線圈 L‧‧‧Motor coil

Vin‧‧‧輸入電源 Vin‧‧‧Input power supply

Vcc‧‧‧操作電壓 Vcc‧‧‧ operating voltage

Vs‧‧‧工作電壓 Vs‧‧‧ working voltage

Claims (8)

一種風扇馬達斷電自動煞車之電路，係包括：      一儲能單元，係接收並儲存一操作電壓；      一馬達驅動電路，具有複數上臂開關組件、複數下臂開關組件、一第      一驅動單元及一第二驅動單元，該等上臂開關組件的一第一端電性連     接該儲能單元且接收該操作電壓，其一第二端分別與相對該等下臂開     關組件的一第一端及該馬達線圈相電性連接，該等下臂開關組件的一     第二端則連接至一接地端，並該第一、二驅動單元的一第一端分別電     性連接相對該等上臂開關組件的一第三端；     一控制單元，電性連接相對該等下臂開關的一第三端與該第一、二驅     動單元的一第二端；     一電阻單元，其一端電性連接一輸入電源，其另一端電性連接相對該     第一、二驅動單元的一第三端，並該第一、二驅動單元的一第四端電     性連接該接地端；及     其中當該風扇斷電時，該等上臂開關組件接收到該儲能單元提供的該     操作電壓而導通，該等下臂開關組件未接收到該操作電壓而不導通，     令該等上臂開關組件與該馬達線圈形成一封閉迴路而煞車。A circuit for a fan motor to be powered off automatically includes: an energy storage unit that receives and stores an operating voltage; a motor drive circuit having a plurality of upper arm switch assemblies, a plurality of lower arm switch assemblies, a first drive unit, and a a second driving unit, the first end of the upper arm switch assembly is electrically connected to the energy storage unit and receives the operating voltage, and a second end thereof is opposite to a first end of the lower arm switch assembly and The motor coils are electrically connected to each other. A second end of the lower arm switch assembly is connected to a ground end, and a first end of the first and second drive units are electrically connected to the upper arm switch assembly respectively. a third end; a control unit electrically connected to a third end of the lower arm switch and a second end of the first and second driving units; a resistor unit electrically connected to an input power source at one end thereof The other end is electrically connected to a third end of the first and second driving units, and the first and second driving A fourth end of the element is electrically connected to the ground end; and wherein when the fan is powered off, the upper arm switch assembly receives the operating voltage provided by the energy storage unit and is turned on, and the lower arm switch assembly is not received The operating voltage is not turned on, so that the upper arm switch assembly and the motor coil form a closed loop to brake. 如申請專利範圍第1項所述之風扇馬達斷電自動煞車之電路，其中該等上臂開關組件具有一第一上臂開關組件與一第二上臂開關組件，該第一、二上臂開關件的該第一端與該儲能單元相電性連接，該第一、二上臂開關組件的該第二端分別電性連接相對該馬達線圈的兩端，該第一、二上臂開關組件的該第三端分別電性連接相對該第一、二驅動單元的該第一端。The circuit of the fan motor power-off automatic brake according to claim 1, wherein the upper arm switch assembly has a first upper arm switch assembly and a second upper arm switch assembly, and the first and second upper arm switch members The first end is electrically connected to the energy storage unit, and the second ends of the first and second upper arm switch assemblies are respectively electrically connected to opposite ends of the motor coil, and the third end of the first and second upper arm switch assemblies The terminals are electrically connected to the first ends of the first and second driving units respectively. 如申請專利範圍第2項所述之風扇馬達斷電自動煞車之電路，其中該等下臂開關組件具有一第一下臂開關組件與一第二下臂開關組件，該第一、二下臂開關組件的該第一端分別電性連接相對該馬達線圈的兩端，該第一、二下臂開關組件的第二端分別電性連接至該接地端，該第一、二下臂開關組件的第三端分別電性連接相對該控制單元。The circuit of the fan motor power-off automatic brake according to claim 2, wherein the lower arm switch assembly has a first lower arm switch assembly and a second lower arm switch assembly, the first and second lower arms The first ends of the switch assembly are electrically connected to opposite ends of the motor coil, and the second ends of the first and second lower arm switch assemblies are electrically connected to the ground end, respectively, the first and second lower arm switch assemblies The third ends are electrically connected to the control unit respectively. 如申請專利範圍第3項所述之風扇馬達斷電自動煞車之電路，其中該電阻單元為一電阻器，該電阻單元的一端電性連接該輸入電源，該電阻單元的另一端與相對該第一、二驅動單元的該第三端相電性連接。The circuit of the fan motor power-off automatic brake according to claim 3, wherein the resistor unit is a resistor, one end of the resistor unit is electrically connected to the input power source, and the other end of the resistor unit is opposite to the first The third ends of the first and second driving units are electrically connected. 如申請專利範圍第1項所述之風扇馬達斷電自動煞車之電路，其中該控制單元為一中央處理器或一微控制器。The circuit of the fan motor power-off automatic brake according to claim 1, wherein the control unit is a central processing unit or a microcontroller. 如申請專利範圍第2項所述之風扇馬達斷電自動煞車之電路，其中該第一驅動單元包含一第一電晶體、一第一電阻器、一第二電阻器、一第三電阻器、一第四電阻器及一第一電容器，該第一電晶體具有一基極、一射極及一集極， 該集極電性連接該第二電阻器的一端，該射極電性連接該第三電阻器的一端與該接地端，該第三電阻器的另一端與該第一電容器的一端、該第一電阻器的一端、該第二電阻器的另一端及該第一上臂開關組件的該第三端共同相電性連接，且該第一電阻器與該第一電容器的另一端連接相對該電阻單元的另一端，該第四電阻器的一端電性連接該基極，其另一端電性連接相對該控制單元。The circuit of the fan motor power-off automatic brake according to the second aspect of the invention, wherein the first driving unit comprises a first transistor, a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor, the first transistor has a base, an emitter and a collector, the collector is electrically connected to one end of the second resistor, and the emitter is electrically connected And a first end of the third resistor The third end is electrically connected to the other end, and the other end of the first resistor is connected to the other end of the resistor unit, and one end of the fourth resistor is electrically connected to the base, and the other One end is electrically connected to the control unit. 如申請專利範圍第6項所述之風扇馬達斷電自動煞車之電路，其中該第二驅動單元包含一第二電晶體、一第五電阻器、一第六電阻器、一第七電阻器、一第八電阻器及一第二電容器，該第二電晶體具有一基極、一射極及一集極， 該第二電晶體的該集極電性連接該第七電阻器的一端，該第二電晶體的該射極電性連接該第六電阻器的一端與該接地端，該第六電阻器的另一端與該第二電容器的一端、該第五電阻器的一端、該第七電阻器的另一端及該第二上臂開關組的該第三端共同相電性連接，且該第五電阻器與第二電容器的另一端連接相對該電阻單元的另一端，該第八電阻器的一端電性連接該第二電晶體的該基極，其另一端電性連接相對該控制單元。The circuit of the fan motor power-off automatic brake according to the sixth aspect of the invention, wherein the second driving unit comprises a second transistor, a fifth resistor, a sixth resistor, a seventh resistor, An eighth resistor and a second capacitor, the second transistor has a base, an emitter and a collector, and the collector of the second transistor is electrically connected to one end of the seventh resistor, The emitter of the second transistor is electrically connected to one end of the sixth resistor and the ground, the other end of the sixth resistor and one end of the second capacitor, one end of the fifth resistor, and the seventh The other end of the resistor and the third end of the second upper arm switch group are electrically connected in common, and the other end of the fifth resistor and the second capacitor are connected to the other end of the resistor unit, the eighth resistor One end of the second transistor is electrically connected to the base of the second transistor, and the other end of the second electrode is electrically connected to the control unit. 如申請專利範圍第4項所述之風扇馬達斷電自動煞車之電路，其中該電阻單元為0歐姆電阻器。The circuit of the fan motor power-off automatic brake according to claim 4, wherein the resistor unit is a 0 ohm resistor.
TW105219599U 2016-12-23 2016-12-23 Automatic braking circuit for power-off of fan motor TWM539183U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107070313A (en) * 2017-06-08 2017-08-18 合肥凯利科技投资有限公司 A kind of controller with power-off lock electric motors function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107070313A (en) * 2017-06-08 2017-08-18 合肥凯利科技投资有限公司 A kind of controller with power-off lock electric motors function

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