CN101247098A - fan control - Google Patents

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CN101247098A
CN101247098A CNA2007100849615A CN200710084961A CN101247098A CN 101247098 A CN101247098 A CN 101247098A CN A2007100849615 A CNA2007100849615 A CN A2007100849615A CN 200710084961 A CN200710084961 A CN 200710084961A CN 101247098 A CN101247098 A CN 101247098A
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signal
resistor
switch
fan
circuit
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CN100561852C (en
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邓文平
刘铭龙
吴嘉煌
刘政杰
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Delta Electronics Inc
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Delta Electronics Inc
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Abstract

一种风扇控制装置依据一控制讯号来控制一风扇，其包括一讯号输入单元、一启动保护单元以及一驱动单元。该讯号输入单元接收该控制讯号；该启动保护单元输出一保护讯号，并于一段期间之后停止输出该保护讯号；该驱动单元耦接至该启动保护单元与该讯号输入单元以接收该保护讯号与该控制讯号，该保护讯号抑制该驱动单元于该段期间内驱动该风扇的电流，该控制讯号控制该驱动单元于该段期间后驱动该风扇。

Figure 200710084961

A fan control device controls a fan according to a control signal, and includes a signal input unit, a startup protection unit, and a drive unit. The signal input unit receives the control signal; the startup protection unit outputs a protection signal, and stops outputting the protection signal after a period of time; the drive unit is coupled to the startup protection unit and the signal input unit to receive the protection signal and the control signal, the protection signal suppresses the current of the drive unit driving the fan during the period of time, and the control signal controls the drive unit to drive the fan after the period of time.

Figure 200710084961

Description

风扇控制装置 fan control

技术领域 technical field

本发明涉及一种控制装置，特别是涉及一种风扇控制装置。The invention relates to a control device, in particular to a fan control device.

背景技术 Background technique

风扇已常用于现今的电子装置的中，藉以提供散热或导流的机制。Fans are commonly used in today's electronic devices to provide heat dissipation or air conduction mechanisms.

如图1所示，现有风扇控制装置1接收一控制讯号SCNT来控制风扇2的转速。该风扇控制装置1包括一输入电路11与一驱动电路12，该输入电路11接收该控制讯号SCNT，该输入电路11提供稳定的工作点以使该控制讯号SCNT得以正确地输入至该驱动电路12，该驱动电路12依据该控制讯号SCNT来控制该风扇2的转速。As shown in FIG. 1 , the conventional fan control device 1 receives a control signal S CNT to control the speed of the fan 2 . The fan control device 1 includes an input circuit 11 and a drive circuit 12, the input circuit 11 receives the control signal S CNT , the input circuit 11 provides a stable operating point so that the control signal S CNT can be correctly input to the drive A circuit 12, the drive circuit 12 controls the speed of the fan 2 according to the control signal S CNT .

然而，当启动或重置时，该风扇2或该风扇控制装置1皆无可避免地产生如图2所示的启动电流，启动电流将会对于该风扇2或该风扇控制装置1、甚至是其应用的设备或电路造成电流过载。However, when starting or resetting, the fan 2 or the fan control device 1 will inevitably generate a starting current as shown in FIG. The equipment or circuit to which it is applied creates a current overload.

虽然在该驱动电路12中可加入限流功能，但限流功能仅能稍微减少与抑制启动电流，且此种限流功能仅能保护该风扇2内部的半导体组件与线圈，但对于应用的设备或电路来说，限流功能仍不足以降低启动电流。Although a current-limiting function can be added to the drive circuit 12, the current-limiting function can only slightly reduce and suppress the starting current, and this current-limiting function can only protect the semiconductor components and coils inside the fan 2, but for the applied equipment Or circuit, the current limiting function is still not enough to reduce the starting current.

因此，如何提供一种风扇控制装置，避免上述问题的发生及改善上述的缺点，为一重要的课题。Therefore, how to provide a fan control device to avoid the above-mentioned problems and improve the above-mentioned shortcomings is an important issue.

发明内容 Contents of the invention

有鉴于上述课题，本发明的目的为提供一种风扇控制装置，其可降低风扇启动或重设时的启动电流。In view of the above problems, the object of the present invention is to provide a fan control device, which can reduce the starting current when the fan starts or resets.

为实现上述目的，依据本发明的一种风扇控制装置依据一控制讯号来控制一风扇，该装置包括一讯号输入单元、一启动保护单元以及一驱动单元。该讯号输入单元接收该控制讯号；该启动保护单元输出一保护讯号，并于一段期间之后停止输出该保护讯号；该驱动单元耦接至该启动保护单元与该讯号输入单元以接收该保护讯号与该控制讯号，该保护讯号抑制该驱动单元于该段期间内驱动该风扇的电流，该控制讯号控制该驱动单元于该段期间后驱动该风扇。To achieve the above object, a fan control device according to the present invention controls a fan according to a control signal, and the device includes a signal input unit, a startup protection unit and a drive unit. The signal input unit receives the control signal; the start protection unit outputs a protection signal, and stops outputting the protection signal after a period of time; the drive unit is coupled to the start protection unit and the signal input unit to receive the protection signal and The control signal, the protection signal suppresses the current of the drive unit driving the fan during the period, and the control signal controls the drive unit to drive the fan after the period.

如上所述，因依据本发明的风扇控制装置，其输出保护讯号来强迫控制驱动单元避免驱动风扇，因而可减少风扇或风扇控制装置于启动或重置时的启动电流。As mentioned above, according to the fan control device of the present invention, it outputs a protection signal to forcibly control the drive unit to avoid driving the fan, thereby reducing the starting current of the fan or the fan control device when starting or resetting.

附图说明 Description of drawings

图1为一种现有风扇控制装置的示意图；FIG. 1 is a schematic diagram of an existing fan control device;

图2为图1中驱动风扇的电流波形图；Fig. 2 is a current waveform diagram of driving the fan in Fig. 1;

图3为依据本发明较佳实施例的一种风扇控制装置的示意图；3 is a schematic diagram of a fan control device according to a preferred embodiment of the present invention;

图4为图3中驱动风扇的电流波形图；以及FIG. 4 is a current waveform diagram for driving the fan in FIG. 3; and

图5为图3的风扇控制装置的电路图。FIG. 5 is a circuit diagram of the fan control device in FIG. 3 .

附图符号说明：Explanation of reference symbols:

1               风扇控制装置             11        输入电路1 Fan control device 11 Input circuit

12              驱动电路                 2         风扇12 Drive circuit 2 Fan

3               风扇控制装置             31        讯号输入单元3 Fan control device 31 Signal input unit

32              启动保护单元             321       缓启动控制电路32 Start protection unit 321 Slow start control circuit

322             低速控制电路             323       隔离电路322 Low-speed control circuit 323 Isolation circuit

324             逆电流保护电路           33        驱动单元324 Reverse current protection circuit 33 Drive unit

34              讯号重置单元             35        电源重置单元34 Signal reset unit 35 Power reset unit

4               风扇4 fans

BUF1            重置缓冲电路              BUF2     延迟缓冲电路BUF 1 reset buffer circuit BUF 2 delay buffer circuit

C1～C3          第一～第三电容器          D1       二极管C 1 ~C 3 first ~ third capacitor D 1 diode

R1～R15         第一～第十五电阻器        SW1～SW3 第一～第三开关R 1 to R 15 first to fifteenth resistors SW 1 to SW 3 first to third switches

SW4             低速控制开关              SW5      第五开关SW 4 Low speed control switch SW 5 Fifth switch

SW6             缓启动开关                SW7      讯号重置开关SW 6 Slow start switch SW 7 Signal reset switch

SW8             电源重置开关              SW9      开关SW 8 Power Reset Switch SW 9 Switch

SCNT            控制讯号                  SPROT    保护讯号S CNT control signal S PROT protection signal

SRESET          重置控制讯号S RESET reset control signal

SRST_S、SRST_P  重置讯号S RST_S , S RST_P reset signal

VCC、VIN、VREF  电源讯号V CC , V IN , V REF power supply signal

具体实施方式 Detailed ways

以下将参照相关附图，说明依据本发明较佳实施例的一种风扇控制装置。A fan control device according to a preferred embodiment of the present invention will be described below with reference to related drawings.

请参照图3所示，依据本发明较佳实施例的一风扇控制装置3依据一控制讯号SCNT来控制一风扇4，该装置包括一讯号输入单元31、一启动保护单元32以及一驱动单元33。Please refer to FIG. 3, a fan control device 3 according to a preferred embodiment of the present invention controls a fan 4 according to a control signal S CNT , the device includes a signal input unit 31, a start protection unit 32 and a drive unit 33.

一电源讯号VCC驱动该驱动单元33动作，一电源讯号VREF驱动该讯号输入单元31与该启动保护单元32动作。A power signal V CC drives the drive unit 33 to act, and a power signal V REF drives the signal input unit 31 and the boot protection unit 32 to act.

该讯号输入单元31接收该控制讯号SCNT，该讯号输入单元31提供稳定的工作点以使该控制讯号SCNT得以正常地输入至该驱动单元33。The signal input unit 31 receives the control signal S CNT , and the signal input unit 31 provides a stable working point so that the control signal S CNT can be normally input to the driving unit 33 .

当该风扇控制装置3启动或重设时，该启动保护单元32输出一保护讯号SPROT，并于一段期间之后停止输出该保护讯号SPROT，该驱动单元33耦接至该启动保护单元32与该讯号输入单元31以接收该保护讯号SPROT与该控制讯号SCNT。该保护讯号SPROT抑制该驱动单元33于该段期间内驱动该风扇4的电流，该控制讯号SCNT控制该驱动单元33于该段期间后驱动该风扇4。When the fan control device 3 is started or reset, the start protection unit 32 outputs a protection signal S PROT , and stops outputting the protection signal S PROT after a period of time. The drive unit 33 is coupled to the start protection unit 32 and The signal input unit 31 receives the protection signal S PROT and the control signal S CNT . The protection signal S PROT inhibits the drive unit 33 from driving the fan 4 during the period, and the control signal S CNT controls the drive unit 33 to drive the fan 4 after the period.

该保护讯号SPROT与该控制讯号SCNT的线路共同耦接至该驱动单元33的讯号输入端，该驱动单元33的讯号输入端的电平设定为与该风扇4的转速成反比，为了在该风扇控制装置3启动或重设时避免该驱动单元33产生过大的启动电流来驱动该风扇4，该保护讯号可设为高电平来输入至该驱动电路，藉以强迫该驱动电路输出极低的电流来驱动该风扇4，使得该风扇4不转动或是以极低的转速运作。The circuit of the protection signal S PROT and the control signal S CNT is jointly coupled to the signal input end of the drive unit 33 , and the level of the signal input end of the drive unit 33 is set to be inversely proportional to the speed of the fan 4 , in order to When the fan control device 3 is started or reset, the drive unit 33 is prevented from generating an excessive starting current to drive the fan 4, and the protection signal can be set to a high level to be input to the drive circuit, so as to force the drive circuit to output extremely Low current is used to drive the fan 4, so that the fan 4 does not rotate or operates at a very low speed.

当该段期间之后该风扇控制装置3于稳态运转时，其依据该控制讯号SCNT的电平来控制该风扇4的转速，该控制讯号SCNT的电平与该风扇4的转速成反比。When the fan control device 3 operates in a steady state after the period, it controls the speed of the fan 4 according to the level of the control signal S CNT , which is inversely proportional to the level of the control signal S CNT .

在本实施例中，为了获得较佳的控制效果，在该段期间内该保护讯号SPROT是先防止该驱动单元33驱动该风扇4，之后再控制该驱动单元33驱动该风扇4维持低转速，使得该风扇4的转速可以逐渐增加，于该段期间之后便可顺利地进入稳态运作。也就是说，在该段期间内该保护讯号SPROT是先为高电平并逐渐变为中电平，并以该保护讯号SPROT来控制该驱动单元33，在该段期间之后改以该控制讯号SCNT来控制该驱动单元33，该风扇4的转速控制于该控制讯号SCNT所对应的转速。In this embodiment, in order to obtain a better control effect, the protection signal S PROT first prevents the drive unit 33 from driving the fan 4 during this period, and then controls the drive unit 33 to drive the fan 4 to maintain a low speed. , so that the rotation speed of the fan 4 can be gradually increased, and after this period, it can smoothly enter into a steady state operation. That is to say, during this period, the protection signal S PROT is at high level first and then gradually becomes a middle level, and the driving unit 33 is controlled by the protection signal S PROT , and then changed to the The driving unit 33 is controlled by the control signal S CNT , and the speed of the fan 4 is controlled at the speed corresponding to the control signal S CNT .

如此一来，驱动该风扇4的电流波形如图4所示，明显的，驱动电流于该风扇控制装置3启动或重设的初的启动电流趋近于0，因而启动电流可有效地受到压抑。In this way, the current waveform for driving the fan 4 is shown in FIG. 4 . Obviously, the initial starting current of the driving current tends to zero when the fan control device 3 is started or reset, so the starting current can be effectively suppressed. .

在本实施例中，为了达到瞬间输出高电平的保护讯号SPROT，该启动保护单元32包括一第一电容器，该第一电容器具有一第一端与一第二端，该第一端接收该电源讯号，该第二端耦接该驱动单元33，该电源讯号的瞬间能量使该第一电容器短路以在该第二端输出高电平的该保护讯号SPROT至该驱动单元33。因此，不论该风扇控制装置3于启动或重置时皆可确保输入至该驱动单元33的讯号为高电平。In this embodiment, in order to output a high-level protection signal S PROT instantaneously, the startup protection unit 32 includes a first capacitor, the first capacitor has a first terminal and a second terminal, and the first terminal receives The second end of the power signal is coupled to the driving unit 33 , and the instantaneous energy of the power signal short-circuits the first capacitor to output the high-level protection signal S PROT to the driving unit 33 at the second end. Therefore, no matter when the fan control device 3 is started or reset, the signal input to the drive unit 33 can be guaranteed to be at a high level.

另外，该驱动单元33包括一数字模拟转换电路(图未示)以及一模拟驱动电路(图未示)，该数字模拟转换电路耦接至该启动保护电路32与该讯号输入电路31，以将该控制讯号SCNT与该保护讯号SPROT由数字转换为模拟。该模拟驱动电路耦接至该数字模拟转换电路，该保护讯号SPROT抑制该模拟驱动单元于该段期间内驱动该风扇4的电流，该控制讯号SCNT控制该模拟驱动单元于该段期间后驱动该风扇4。In addition, the drive unit 33 includes a digital-to-analog conversion circuit (not shown) and an analog drive circuit (not shown), the digital-to-analog conversion circuit is coupled to the start-up protection circuit 32 and the signal input circuit 31, so as to The control signal S CNT and the protection signal S PROT are converted from digital to analog. The analog drive circuit is coupled to the digital-to-analog conversion circuit, the protection signal S PROT inhibits the analog drive unit from driving the current of the fan 4 during the period, and the control signal S CNT controls the analog drive unit after the period The fan 4 is driven.

另外，请再参照图3所示，该风扇控制装置3还包括一讯号重置单元34以及一电源重置单元35。In addition, please refer to FIG. 3 again, the fan control device 3 further includes a signal reset unit 34 and a power reset unit 35 .

该讯号重置单元34耦接至该启动保护单元32，并检测一重置控制讯号SRESET以输出一重置讯号SRST_S来控制该启动保护单元32输出该保护讯号SPROT。The signal reset unit 34 is coupled to the boot protection unit 32 and detects a reset control signal S RESET to output a reset signal S RST_S to control the boot protection unit 32 to output the protection signal S PROT .

该电源重置单元35耦接至该启动保护单元32，并检测该电源讯号VREF是否重置以输出一重置讯号SRST_P来控制该启动保护单元32输出该保护讯号SPROT。The power reset unit 35 is coupled to the boot protection unit 32 and detects whether the power signal V REF is reset to output a reset signal S RST_P to control the boot protection unit 32 to output the protection signal S PROT .

于本实施例中，该讯号重置单元34于该风扇4的扇叶被强迫停止时而致能(enable)，而电源重置单元35则于该风扇4、风扇控制装置3或其它相关单元热插拔时而致能。In this embodiment, the signal reset unit 34 is enabled (enable) when the fan blades of the fan 4 are forced to stop, and the power reset unit 35 is used when the fan 4, the fan control device 3 or other related units are hot. It is enabled when plugging and unplugging.

如图5所示，图5示出了该风扇控制装置3的电路图。该讯号输入单元31包括一第十一～第十四电阻器R11～R14、一第五开关SW5，该第十二～第十四电阻器R12～R14与该电源讯号VREF构成一输入偏压电路以接收该控制讯号SCNT，该控制讯号SCNT输入至该第五开关SW5，该第十一电阻器R11作为负载以稳定地传送出该控制讯号SCNT。As shown in FIG. 5 , FIG. 5 shows a circuit diagram of the fan control device 3 . The signal input unit 31 includes an eleventh to fourteenth resistors R 11 to R 14 , a fifth switch SW 5 , the twelfth to fourteenth resistors R 12 to R 14 are connected to the power signal V REF An input bias circuit is formed to receive the control signal S CNT , the control signal S CNT is input to the fifth switch SW 5 , and the eleventh resistor R 11 acts as a load to stably transmit the control signal S CNT .

该启动保护单元32包括一第一电阻器R1、一第一电容器C1、一缓启动控制电路321、一低速控制电路322以及一隔离电路323。The start protection unit 32 includes a first resistor R 1 , a first capacitor C 1 , a slow start control circuit 321 , a low speed control circuit 322 and an isolation circuit 323 .

一电源讯号VREF输入至该第一电阻器R1，该第一电容器C1具有一第一端与一第二端，该第一端连接至该第一电阻器R1以接收该电源讯号VREF，该第二端耦接该驱动单元33，该电源讯号VREF的瞬间能量使该第一电容器C1短路以在该第二端输出高电平的该保护讯号SPROT至该驱动单元33。A power signal V REF is input to the first resistor R 1 , the first capacitor C 1 has a first terminal and a second terminal, the first terminal is connected to the first resistor R 1 to receive the power signal V REF , the second terminal is coupled to the driving unit 33, the instantaneous energy of the power signal V REF short-circuits the first capacitor C 1 to output the high-level protection signal S PROT to the driving unit at the second terminal 33.

该缓启动控制电路321耦接于该第一电容器C1的该第一端，并控制该第一电容器C1停止输出高电平的该保护讯号SPROT。The slow start control circuit 321 is coupled to the first terminal of the first capacitor C 1 , and controls the first capacitor C 1 to stop outputting the high-level protection signal S PROT .

该缓启动控制电路321包括一缓启动开关SW6以及一重置缓冲电路BUF1。该缓启动开关SW6的一端耦接该第一电容器C1的该第一端，另一端耦接一接地端。该重置缓冲电路BUF1的一端耦接该缓启动开关SW6并经由一第十电阻器R10接收该电源讯号VREF，另一端耦接该接地端，其控制该缓启动开关SW6以导通该第一电容器C1该第一端与该接地端的路径，使该第一电容器C1停止输出高电平的该保护讯号SPROT。The soft start control circuit 321 includes a soft start switch SW6 and a reset buffer circuit BUF1. One end of the slow start switch SW 6 is coupled to the first end of the first capacitor C 1 , and the other end is coupled to a ground. One end of the reset buffer circuit BUF 1 is coupled to the slow-start switch SW 6 and receives the power signal V REF through a tenth resistor R 10 , and the other end is coupled to the ground terminal, which controls the slow-start switch SW 6 to The path between the first terminal and the ground terminal of the first capacitor C 1 is turned on, so that the first capacitor C 1 stops outputting the high-level protection signal S PROT .

该低速控制电路322与该缓启动控制电路321及该驱动单元33耦接，以输出中电平的保护讯号SPROT至该驱动单元33。The low-speed control circuit 322 is coupled to the slow-start control circuit 321 and the driving unit 33 to output a middle-level protection signal S PROT to the driving unit 33 .

该低速控制电路322包括一第二电阻器R2以及一低速控制开关SW4，该第二电阻器R2作为一分压组件，其耦接该驱动电路33并从一第三电阻器R3接收一电源讯号VIN；该低速控制开关SW4耦接于该第二电阻器R2与该接地端之间，该缓启动开关SW6控制该低速控制开关SW4以导通该第二电阻器R2与该接地端的路径，以在该段期间之后于该第二电阻器R2输出中电平的保护讯号SPROT至该驱动单元33。The low-speed control circuit 322 includes a second resistor R 2 and a low-speed control switch SW 4 , the second resistor R 2 is used as a voltage divider, which is coupled to the drive circuit 33 and is connected to the drive circuit 33 from a third resistor R 3 Receive a power signal V IN ; the low-speed control switch SW 4 is coupled between the second resistor R 2 and the ground terminal, the slow-start switch SW 6 controls the low-speed control switch SW 4 to turn on the second resistor The path between the resistor R2 and the ground terminal, so that the second resistor R2 outputs the protection signal S PROT of the middle level to the driving unit 33 after the period.

该隔离电路323耦接于该缓启动控制电路321与该驱动电路33之间，防止该控制讯号SCNT与该缓启动控制电路321互相干扰。The isolation circuit 323 is coupled between the slow start control circuit 321 and the driving circuit 33 to prevent the control signal S CNT from interfering with the slow start control circuit 321 .

该隔离电路323包括一第一开关SW1、一第二开关SW2、一第八电阻器R8及一第九电阻器R9，该缓启动控制电路321控制该第二开关SW2导通该第九电阻器R9与该接地端的路径，该第二开关SW2控制该第一开关SW1导通该第八电阻器R8与该接地端的路径，该第八电阻器R8耦接至该驱动电路33。The isolation circuit 323 includes a first switch SW 1 , a second switch SW 2 , an eighth resistor R 8 and a ninth resistor R 9 , and the slow start control circuit 321 controls the second switch SW 2 to conduct The path between the ninth resistor R 9 and the ground terminal, the second switch SW 2 controls the first switch SW 1 to conduct the path between the eighth resistor R 8 and the ground terminal, and the eighth resistor R 8 is coupled to to the drive circuit 33 .

另外，为了确保前后级电路的稳定度，在该启动保护单元32还包括一逆电流保护电路324，该逆电流保护电路324耦接于该缓启动控制电路321与该驱动电路33之间，其包括一二极管D1、一第三开关SW3，该二极管D1耦接于该讯号输入单元31与该驱动电路33之间，该第三开关SW3受控于该缓启动控制电路321以导通该二极管D1与该接地端的路径。In addition, in order to ensure the stability of the front and back stage circuits, the startup protection unit 32 also includes a reverse current protection circuit 324, the reverse current protection circuit 324 is coupled between the slow start control circuit 321 and the drive circuit 33, its It includes a diode D 1 and a third switch SW 3 , the diode D 1 is coupled between the signal input unit 31 and the drive circuit 33 , the third switch SW 3 is controlled by the slow start control circuit 321 to lead A path through the diode D1 and the ground terminal.

该重置缓冲电路BUF1包括一第四电阻器R4与一第二电容器C2，于该风扇控制装置3启动或重置时，该电源讯号VREF对该第二电容器C2充电，使得该缓启动开关SW6与该第一开关SW1关闭，而该第二开关SW2与该低速控制开关SW4导通，该中电平的该保护讯号SPROT经由该第三电阻器R3及该第二电阻器R2将该电源讯号VIN分压输入至该驱动电路33。The reset buffer circuit BUF 1 includes a fourth resistor R 4 and a second capacitor C 2 , when the fan control device 3 is started or reset, the power signal V REF charges the second capacitor C 2 , so that The slow start switch SW 6 and the first switch SW 1 are turned off, and the second switch SW 2 and the low speed control switch SW 4 are turned on, and the protection signal S PROT of the middle level passes through the third resistor R 3 And the second resistor R 2 divides the power signal V IN and inputs it to the driving circuit 33 .

该第二电容器C2与该第十电阻器R10的时间常数可决定该保护讯号SPROT维持在中电平的时间。当该第二电容器C2充电达到稳态之后，则该缓启动开关SW6关闭该低速控制开关SW4、该逆电流保护电路324的该第三开关SW3及该隔离电路323的该第二开关SW2，因而该第一开关SW1导通该第八电阻器R8与该接地端的路径，使得该等第三、第八电阻器R3、R8得以作为该控制讯号SCNT输入至该驱动单元33的偏压电路。该控制讯号SCNT可控制该驱动单元33来驱动该风扇4的转速。The time constants of the second capacitor C 2 and the tenth resistor R 10 can determine the time for the protection signal S PROT to maintain the middle level. After the charging of the second capacitor C 2 reaches a steady state, the slow start switch SW 6 closes the low speed control switch SW 4 , the third switch SW 3 of the reverse current protection circuit 324 and the second switch of the isolation circuit 323. Switch SW 2 , so the first switch SW 1 conducts the path between the eighth resistor R 8 and the ground terminal, so that the third and eighth resistors R 3 and R 8 can be input as the control signal S CNT to The bias circuit of the driving unit 33 . The control signal S CNT can control the driving unit 33 to drive the speed of the fan 4 .

该讯号重置单元34具有一讯号重置开关SW7，以及一第十五电阻器R15，该第十五电阻器R15接收该电源讯号VREF并耦接该讯号重置开关SW7的一控制端，该讯号重置开关SW7的一端耦接该重置缓冲电路BUF1，另一端耦接该接地端。于本实施例中，当该风扇4的扇叶被强迫停止时，该重置控制讯号SRESET控制该讯号重置开关SW7导通该重置缓冲电路BUF1与该接地端的路径，并输出一重置讯号SRST_S至该缓启动开关SW6来控制该启动保护单元32输出该保护讯号SPROT。The signal reset unit 34 has a signal reset switch SW 7 and a fifteenth resistor R 15 , the fifteenth resistor R 15 receives the power signal V REF and is coupled to the signal reset switch SW 7 A control terminal, one terminal of the signal reset switch SW 7 is coupled to the reset buffer circuit BUF 1 , and the other terminal is coupled to the ground terminal. In this embodiment, when the blades of the fan 4 are forced to stop, the reset control signal S RESET controls the signal reset switch SW 7 to conduct the path between the reset buffer circuit BUF 1 and the ground terminal, and output A reset signal S RST_S is sent to the slow start switch SW 6 to control the start protection unit 32 to output the protection signal S PROT .

该电源重置单元35具有一延迟缓冲电路BUF2与一电源重置开关SW8，该电源重置开关SW8的一端耦接该重置缓冲电路BUF1，另一端耦接该接地端。于本实施例中，当该风扇4在插拔之后，该延迟缓冲电路BUF2缓冲该电源讯号VREF控制该电源重置开关SW8导通该重置缓冲电路BUF1与该接地端的路径，并输出一重置讯号SREF_P至该缓启动开关SW6来控制该启动保护单元32输出该保护讯号SPROT。The power reset unit 35 has a delay buffer circuit BUF 2 and a power reset switch SW 8 , one end of the power reset switch SW 8 is coupled to the reset buffer circuit BUF 1 , and the other end is coupled to the ground. In this embodiment, after the fan 4 is plugged in and out, the delay buffer circuit BUF 2 buffers the power signal V REF to control the power reset switch SW 8 to turn on the path between the reset buffer circuit BUF 1 and the ground terminal, And output a reset signal S REF_P to the slow start switch SW 6 to control the start protection unit 32 to output the protection signal S PROT .

该延迟缓冲电路BUF2包括一第五、第六、第七电阻器R5～R7、一第三电容器C3与一开关SW9，该电源讯号VREF输入至该第五电阻器R5及该第六电阻器R6，该第六电阻器R6、该第七电阻器R7与该第三电容器C3的一端共同耦接至该开关SW9以控制该电源重置开关SW8。The delay buffer circuit BUF 2 includes a fifth, sixth and seventh resistors R 5 -R 7 , a third capacitor C 3 and a switch SW 9 , the power signal V REF is input to the fifth resistor R 5 and the sixth resistor R 6 , the sixth resistor R 6 , the seventh resistor R 7 and one end of the third capacitor C 3 are commonly coupled to the switch SW 9 to control the power reset switch SW 8 .

当该风扇控制装置3启动或重置时，该开关SW9的导通会因该第六电阻器R6与该第三电容器C3的充电时间而延迟，该电源讯号VREF控制该开关SW8导通该缓启动开关SW6与该接地端的路径，并将该第二电容器C2的储能瞬间释放，使得该缓启动开关SW6关闭以控制该保护讯号SPROT于中电平。When the fan control device 3 is started or reset, the turn-on of the switch SW 9 will be delayed due to the charging time of the sixth resistor R 6 and the third capacitor C 3 , and the power signal V REF controls the switch SW 8 turns on the path between the slow-start switch SW 6 and the ground terminal, and releases the energy stored in the second capacitor C 2 instantaneously, so that the slow-start switch SW 6 is turned off to control the protection signal S PROT at the middle level.

经过该第六电阻器R6与该第三电容器C3的充电时间之后，该开关SW9导通且该电源重置开关SW8关闭，因此该第四电阻器R4与该第二电容器C2开始充电，但是该缓启动开关SW6仍维持在关闭因而维持该保护讯号SPROT于中电平。After the charging time of the sixth resistor R6 and the third capacitor C3 , the switch SW9 is turned on and the power reset switch SW8 is turned off, so the fourth resistor R4 and the second capacitor C 2 starts to charge, but the slow-start switch SW 6 is still closed to maintain the protection signal S PROT at the middle level.

当该风扇4正常运作时，该重置控制讯号SRESET为低电平并控制该讯号重置开关SW7关闭；但当该风扇4的转子发生锁住情况时，此时该重置控制讯号SRESET为高电平，并控制该讯号重置开关SW7导通，并使该第二电容器C2的储能瞬间释放以关闭该缓启动开关SW6。When the fan 4 is in normal operation, the reset control signal S RESET is at low level and controls the reset switch SW 7 of the signal to close; but when the rotor of the fan 4 is locked, the reset control signal S RESET is at a high level, and controls the signal to turn on the reset switch SW 7 , and instantly releases the energy stored in the second capacitor C 2 to turn off the slow start switch SW 6 .

在本实施例中，这些开关SW1～SW9可用双极接合型晶体管(BJT)或金属氧化物半导体场效晶体管(MOSFET)来实现，以金属氧化物半导体场效应晶体管实现来说，这些开关SW1～SW9的栅极作为控制开关动作的输入端，漏极与源作为被控制要导通的两端。In this embodiment, these switches SW 1 to SW 9 can be realized by bipolar junction transistors (BJT) or metal oxide semiconductor field effect transistors (MOSFET). The gates of SW 1 -SW 9 are used as input terminals for controlling switching actions, and the drains and sources are used as two ends controlled to be turned on.

该风扇控制装置3的优点在于可使用开关、晶体管、电容器、与电阻器等小型且低价组件来实现，除了可调整电阻值来改变低转速的运转控制之外，并可藉由电容器来实现缓启动与正常运转控制。此外，外部输入的控制讯号无法影响保护讯号的动作，藉此可确保风扇控制装置于稳态之后才控制风扇动作。The advantage of the fan control device 3 is that it can be implemented using small and low-cost components such as switches, transistors, capacitors, and resistors. In addition to adjusting the resistance value to change the operation control at low speeds, it can also be implemented by capacitors. Slow start and normal running control. In addition, the externally input control signal cannot affect the action of the protection signal, thereby ensuring that the fan control device controls the action of the fan after the steady state.

综上所述，本发明的风扇控制装置输出保护讯号来强迫控制驱动单元避免驱动风扇，因而可减少风扇或风扇控制装置于启动或重置时的启动电流。To sum up, the fan control device of the present invention outputs a protection signal to forcibly control the drive unit to avoid driving the fan, thereby reducing the starting current of the fan or the fan control device when starting or resetting.

以上所述仅为举例说明而非为限制本发明。任何未脱离本发明的精神与范畴的前提下而对其进行的等效修改或变更，均应包含于本发明的权利要求的范围中。The above description is only for illustration and not for limiting the present invention. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the claims of the present invention.

Claims (20)

1. a fan control device is controlled a fan according to a controlling signal, and it comprises:
One signal input unit receives this controlling signal;
One starts protected location, output one protection signal, and after length, stop to export this protection signal; And
One driver element; be coupled to this startup protected location and this signal input unit to receive this protection signal and this controlling signal; this protection signal suppresses the electric current that this driver element drives this fan in during this section, and this controlling signal is controlled this driver element this fan of rear drive during this section.
2. fan control device as claimed in claim 1; wherein the rotating speed of the level of this controlling signal and this fan is inversely proportional to; and this protection signal is a high level; and this protection signal prevents this fan of drive unit drives with high level earlier, drives this fan with middle level control drive unit more afterwards and keeps the slow-speed of revolution.
3. fan control device as claimed in claim 2, wherein this startup protected location comprises:
One first capacitor; have one first end and one second end; this first termination is received a power signal, and this second end couples this driver element, and the transient energy of this power signal makes this first capacitor short-circuit to export the protection signal of high level to this driver element at this second end.
4. fan control device as claimed in claim 3, wherein this startup protected location also comprises:
One first resistor, a power signal input to this first resistor, and this first end of this first capacitor couples this first resistor to receive this power signal.
5. fan control device as claimed in claim 3, wherein this startup protected location also comprises:
One slow starting control circuit is coupled to this first end of this first capacitor, and controls the protection signal that this first capacitor stops to export high level; And
One low speed control circuit; be coupled between this slow starting control circuit and this driver element; when this slow starting control circuit is controlled this first capacitor and stopped to export the protection signal of high level, make the protection signal of level in this low speed control circuit control output simultaneously to this driver element.
6. fan control device as claimed in claim 5, wherein this low speed control circuit comprises:
One second resistor couples this drive circuit and receives a power signal from one the 3rd resistor; And
One low speed control switch; be coupled between this second resistor and the earth terminal; and be controlled by the path of this slow starting control circuit with this second resistor of conducting and this earth terminal, with after during this section in this second resistor output the protection signal of level to this driver element.
7. fan control device as claimed in claim 5, wherein this slow starting control circuit comprises:
One slow starting switch, an end couples this first end of this first capacitor, and the other end couples this earth terminal; And
One replacement buffer circuit; one end couples this slow starting switch and receives this power signal; the other end couples this earth terminal, and it controls this slow starting switch with this first end of this first capacitor of conducting and the path of this earth terminal, makes this first capacitor stop to export this protection signal of high level.
8. fan control device as claimed in claim 7 wherein should comprise by the replacement buffer circuit:
One the 4th resistor receives this power signal;
One second capacitor, an end of the 4th resistor and this second capacitor couples this slow starting switch, and the other end couples this earth terminal.
9. fan control device as claimed in claim 7, it also comprises:
One signal reset cell; has a signal reset switch; one end of this signal reset switch couples this replacement buffer circuit; the other end couples this earth terminal; one replacement controlling signal is controlled this signal reset switch should the replacement buffer circuit with conducting and the path of this earth terminal, and exports a replacement signal and export this protection signal to should slow starting switch controlling this startup protected location.
10. fan control device as claimed in claim 7, it also comprises:
One power supply reset cell; have one and postpone a buffer circuit and a power supply reset switch; one end of this power supply reset switch couples this replacement buffer circuit; the other end couples this earth terminal; this delay buffer circuit cushions this power signal should the replacement buffer circuit and the path of this earth terminal to control this power supply reset switch conducting, and exports a replacement signal and export this protection signal to should slow starting switch controlling this startup protected location.
11. fan control device as claimed in claim 10, wherein this delay buffer circuit comprises:
One the 5th resistor receives this power signal;
One the 6th resistor receives this power signal;
One the 7th resistor;
One the 3rd capacitor;
One switch, an end of the 6th resistor, the 7th resistor and the 3rd capacitor are coupled to this switch jointly should the replacement buffer circuit and the path of this earth terminal to control this power supply reset switch conducting.
12. fan control device as claimed in claim 5, wherein this low speed control circuit comprises:
One dividing potential drop assembly couples this drive circuit and receives this power signal; And
One low speed control switch; be coupled between this dividing potential drop assembly and this earth terminal; this slow starting control circuit is controlled the path of this low speed control switch with this dividing potential drop assembly of conducting and this earth terminal so that in the output of this dividing potential drop assembly the protection signal of level to this driver element.
13. fan control device as claimed in claim 12, this startup protected location also comprises:
One buffer circuit is coupled between this slow starting control circuit and this driver element, prevents that this controlling signal and this slow starting control circuit from interfering with each other.
14. fan control device as claimed in claim 13, this buffer circuit comprises:
One first switch;
One second switch;
One the 8th resistor is coupled to this driver element;
One the 9th resistor receives this power signal;
Wherein this slow starting control circuit is controlled the path of this second switch conducting the 9th resistor and this earth terminal, and this second switch is controlled the path of this first switch conduction the 8th resistor and this earth terminal.
15. fan control device as claimed in claim 5, this startup protected location also comprises:
One reverse-current protection circuit; be coupled between this slow starting control circuit and this driver element; it comprises a diode and one the 3rd switch; this diode is coupled between this signal input unit and this driver element, and the 3rd switch is via the path of this slow starting control circuit control this diode of conducting and this earth terminal.
16. fan control device as claimed in claim 1, it also comprises:
Whether one power supply reset cell is coupled to this startup protected location, and detect a power signal and reset and control this startup protected location and export this protection signal to export a replacement signal.
17. fan control device as claimed in claim 1, it also comprises:
One signal reset cell is coupled to this startup protected location, and detects a replacement controlling signal and control this startup protected location and export this protection signal to export a replacement signal.
18. fan control device as claimed in claim 1, wherein this driver element comprises:
One D/A conversion circuit is coupled to this startup protective circuit and this signal input circuit, being simulation with this controlling signal and this protection signal by digital translation; And
One analog drive circuit is coupled to this D/A conversion circuit, and this protection signal suppresses the electric current that this analog-driven unit drives this fan in during this section, and this controlling signal is controlled this analog-driven unit this fan of rear drive during this section.
19. fan control device as claimed in claim 1, wherein this signal input unit comprises:
The 11 resistor connects religion one power signal;
The 12 resistor receives this controlling signal;
The 13 resistor receives this power signal;
The 14 resistor constitutes an input bias circuit with the 13 resistor; And
One the 5th switch is coupled between the 11 resistor and the earth terminal, and receives this controlling signal also with it output by the 12 resistor.
20. as claim 6,7,9,10,11,14,15 or 19 described fan control devices, wherein this switch can be a bipolar maqting type transistor or a metal oxide semiconductcor field effect transistor.
CNB2007100849615A 2007-02-17 2007-02-17 Fan control device Active CN100561852C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102445977A (en) * 2010-09-30 2012-05-09 鸿富锦精密工业（深圳）有限公司 System and method for lowering startup peak current of server
CN105577037A (en) * 2014-10-31 2016-05-11 台达电子工业股份有限公司 Fan starting control method and fan
CN110099542A (en) * 2018-01-30 2019-08-06 广达电脑股份有限公司 Ensure the method for power supply device normal operation in electronic equipment

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000324807A (en) * 1999-05-10 2000-11-24 Seiko Instruments Inc Switching regulator
CN2600975Y (en) * 2003-02-22 2004-01-21 孟祥生 Start device for AC asynchronous motor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102445977A (en) * 2010-09-30 2012-05-09 鸿富锦精密工业（深圳）有限公司 System and method for lowering startup peak current of server
CN105577037A (en) * 2014-10-31 2016-05-11 台达电子工业股份有限公司 Fan starting control method and fan
CN105577037B (en) * 2014-10-31 2018-12-04 台达电子工业股份有限公司 Fan starting control method and fan
CN110099542A (en) * 2018-01-30 2019-08-06 广达电脑股份有限公司 Ensure the method for power supply device normal operation in electronic equipment

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