CN111963469A - Fan control circuit and electronic device - Google Patents
Fan control circuit and electronic device Download PDFInfo
- Publication number
- CN111963469A CN111963469A CN201910420291.2A CN201910420291A CN111963469A CN 111963469 A CN111963469 A CN 111963469A CN 201910420291 A CN201910420291 A CN 201910420291A CN 111963469 A CN111963469 A CN 111963469A
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- fan
- switch
- resistor
- electrically connected
- control module
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- 239000003990 capacitor Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000004134 energy conservation Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The application provides a fan control circuit, which comprises a fan controller, wherein the fan controller is connected with a fan, and the fan control system further comprises an adjusting module, a feedback module, a temperature sensor and a control module; the adjusting module is electrically connected between a pulse width modulation pin of the fan controller and the control module so as to receive a pulse width modulation signal from the control module to adjust the rotating speed of the fan; the feedback module is electrically connected between a rotating speed pin of the fan controller and the control module so as to feed back a fan rotating speed signal to the control module; the temperature sensor is electrically connected with the control module so as to sense the temperature of the electronic device and output a temperature signal to the control module; and the control module adjusts the duty ratio of the pulse width modulation signal according to the temperature signal and the fan rotating speed signal. The application also provides an electronic device. Therefore, the rotating speed of the fan can be changed along with the temperature change, so that the aim of saving energy is fulfilled.
Description
Technical Field
The application relates to a fan control circuit and an electronic device using the same.
Background
Generally, a fan in an existing electronic device usually rotates at a fixed rotation speed, and when a temperature in the electronic device rises, the rotation speed of the fan cannot be correspondingly increased, so that the temperature in the electronic device cannot be effectively reduced, and when the temperature in the electronic device falls, the rotation speed of the fan cannot be correspondingly reduced, so that electric energy is wasted.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a fan control circuit and an electronic device using the same, which can change the rotation speed of the fan with the temperature change, so as to achieve the purpose of saving energy.
One embodiment of the application provides a fan control circuit, which comprises a fan controller, wherein the fan controller is electrically connected with a fan and comprises a rotating speed pin and a pulse width modulation pin, and the fan control circuit further comprises a regulating module, a feedback module, a temperature sensor and a control module;
the adjusting module is electrically connected between a pulse width modulation pin of the fan controller and the control module and used for receiving a pulse width modulation signal from the control module to adjust the rotating speed of the fan;
the feedback module is electrically connected between a rotating speed pin of the fan controller and the control module and is used for feeding back a fan rotating speed signal to the control module;
the temperature sensor is electrically connected with the control module and used for sensing the temperature of the electronic device and outputting a corresponding temperature signal to the control module; and
the control module is used for setting the corresponding relation between the temperature and the fan rotating speed and correspondingly adjusting the duty ratio of the pulse width modulation signal according to the temperature signal and the fan rotating speed signal.
As a preferable scheme, the adjusting module includes a first switch, a first resistor, a second resistor, and a third resistor, a first end of the first switch is electrically connected to a first power supply through the first resistor, a second end of the first switch is electrically connected to a pulse width modulation pin of the fan controller through the second resistor, a third end of the first switch is electrically connected to the first power supply through the third resistor, and the third end of the first switch is further electrically connected to the control module.
As a preferred scheme, the feedback module includes a second switch, a fourth resistor, a fifth resistor, and a sixth resistor, a first end of the second switch is electrically connected to the rotation speed pin of the fan controller through the fourth resistor, a second end of the second switch is electrically connected to the first power supply through the fifth resistor, the second end of the second switch is also electrically connected to the control module through the sixth resistor, and a third end of the second switch is grounded.
As a preferable scheme, the feedback module further includes a seventh resistor and a first capacitor, the rotation speed pin of the fan controller is grounded through the first capacitor, and the rotation speed pin of the fan controller is further connected to the first power supply through the seventh resistor.
As a preferred scheme, the fan controller further includes a power pin and a ground pin, the power pin is electrically connected to the second power supply, the power pin is further grounded through the second capacitor, and the ground pin is grounded.
Preferably, the first switch and the second switch are both NPN transistors.
Preferably, first ends of the first switch and the second switch are bases of the NPN-type triode, second ends of the first switch and the second switch are collectors of the NPN-type triode, and third ends of the first switch and the second switch are emitters of the NPN-type triode.
Preferably, the first power supply is configured to output a voltage of 3.3 volts, and the second power supply is configured to output a voltage of 12 volts.
As a preferred scheme, the control module is a super input/output chip.
An embodiment of the present application further provides an electronic device, including a fan and the fan control circuit as described above, where the fan is used for dissipating heat for the electronic device, and the fan control circuit is electrically connected to the fan to control a rotation speed of the fan.
According to the fan control circuit and the electronic device, the adjusting module receives the pulse width modulation signal from the control module to adjust the rotating speed of the fan, the feedback module feeds back the rotating speed signal of the fan to the control module, the temperature sensor senses the temperature in the electronic device and feeds back the temperature signal to the control module, and the control module adjusts the duty ratio of the pulse width modulation signal according to the temperature signal and the rotating speed signal of the fan. Therefore, the fan control circuit and the electronic device provided by the embodiment of the application can change the rotating speed of the fan along with the temperature change so as to achieve the purpose of energy conservation.
Drawings
FIG. 1 is a block diagram of a preferred embodiment of an electronic device according to the present application.
Fig. 2 is a block diagram of a preferred embodiment of the fan control circuit of fig. 1.
Fig. 3 is a circuit diagram of a preferred embodiment of the fan control circuit of fig. 1.
Description of the main elements
Adjusting module 12
First to seventh resistors R1-R7
First capacitor C1
Second capacitance C2
First switch Q1
Second switch Q2
First power supply V1
Second power supply V2
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application.
All other embodiments that can be obtained by a person skilled in the art without inventive step based on the embodiments in this application are within the scope of protection of this application.
Referring to fig. 1, fig. 1 is a block diagram of an electronic device 100 according to a preferred embodiment of the present application. The electronic device 100 includes a fan control circuit 10 and a fan 20.
The fan 20 is disposed inside the electronic device 100, and is used for dissipating heat of the electronic device 100. The fan control circuit 10 is used for controlling the rotation speed of the fan 20 according to the temperature of the electronic device 100.
In the present embodiment, the electronic device 100 may be a computer, and the fan 20 may be used for dissipating heat from a central processing unit (not shown) of the computer.
Referring to fig. 2, fig. 2 is a block diagram of a fan control circuit 10 according to a preferred embodiment of the present application. The fan control circuit 10 includes a fan controller 11, a regulation module 12, a feedback module 13, a temperature sensor 14, and a control module 15.
In the embodiment of the present application, the fan controller 11 is electrically connected to the fan 20. The fan controller 11 includes a rotation speed pin TACH, a pulse width modulation pin PWM, a power supply pin VCC, and a ground pin GND.
The adjusting module 12 is electrically connected between the PWM pin PWM of the fan controller 11 and the control module 15, and the adjusting module 12 is configured to receive a PWM signal from the control module 15 to adjust the rotation speed of the fan 20.
The feedback module 13 is electrically connected between the rotation speed pin TACH of the fan controller 11 and the control module 15, and the feedback module 13 is configured to feed back a fan rotation speed signal to the control module 15.
The temperature sensor 14 is electrically connected to the control module 15, and the temperature sensor 14 is configured to sense a temperature of the electronic device 100 and output a corresponding temperature signal to the control module 15.
The control module 15 is configured to set fan rotation speeds corresponding to different temperatures, and correspondingly adjust the duty ratio of the pulse width modulation signal according to the temperature signal and the fan rotation speed signal.
Specifically, the control module 15 is preset with a fan speed comparison table, and the fan speed comparison table stores different fan speeds corresponding to a plurality of different temperatures. For example, a fan speed of 300 rpm corresponding to a temperature of 40 degrees and a fan speed of 600 rpm corresponding to a temperature of 50 degrees. Therefore, the control module 15 can correspondingly adjust the duty ratio of the pwm signal according to the fan speed look-up table by obtaining the temperature fed back by the temperature sensor 14 and the fan speed signal fed back by the feedback module 13, so as to correspondingly adjust the speed of the fan 20.
In this embodiment, the electronic device 100 may be a notebook computer or a desktop computer, or may be other electronic apparatuses. The control module 15 may be a super input output chip.
Referring to fig. 3, fig. 3 is a circuit diagram of a fan control circuit 10 according to a preferred embodiment of the present application.
In this embodiment, the adjusting module 12 may include a first switch Q1, a first resistor R1, a second resistor R2, and a third resistor R3.
A first terminal of the first switch Q1 is electrically connected to a first power source V1 through the first resistor R1, a second terminal of the first switch Q1 is electrically connected to a pulse width modulation pin PWM of the fan controller 11 through the second resistor R2, a third terminal of the first switch Q1 is electrically connected to the first power source V1 through the third resistor R3, and the third terminal of the first switch Q1 is also electrically connected to the control module 15.
In this embodiment, the feedback module 13 may include a second switch Q2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
A first end of the second switch Q2 is electrically connected to the rotation speed pin TACH of the fan controller 11 through the fourth resistor R4, a second end of the second switch Q2 is electrically connected to the first power source V1 through the fifth resistor R5, a second end of the second switch Q2 is also electrically connected to the control module 15 through the sixth resistor R6, and a third end of the second switch Q2 is grounded.
In a preferred embodiment, the feedback module 13 may further include a seventh resistor R7 and a first capacitor C1.
The speed pin TACH of the fan controller 11 is grounded through the first capacitor C1, and the speed pin TACH of the fan controller 11 is further connected to the first power source V1 through the seventh resistor R7. The power supply pin VCC is electrically connected with a second power supply V2, the power supply pin VCC is grounded through a second capacitor C2, and the ground pin GND is grounded.
In this embodiment, the first switch Q1 and the second switch Q2 are both NPN transistors. First ends of the first switch Q1 and the second switch Q2 are bases of the NPN-type transistor, second ends of the first switch Q1 and the second switch Q2 are collectors of the NPN-type transistor, and third ends of the first switch Q1 and the second switch Q2 are emitters of the NPN-type transistor.
When the electronic device 100 is in the operating state, the first power source V1 outputs 3.3V, and the second power source outputs 12V.
The operation principle of the fan control circuit 10 and the electronic device 100 of the present application will be described as follows:
when the electronic device 100 is powered on and turned on, the temperature sensor 14 starts to detect the temperature of the electronic device 100, and the first power source V1 outputs a voltage signal of 3.3V to the first terminal of the first switch Q1 to turn on the first switch Q1. Thus, the control module 15 outputs a pulse modulation signal to the pulse modulation pin PWM of the fan controller 11 through the first switch Q1 and the second resistor R2. At this time, the fan 20 starts to operate.
Next, the fan controller 11 detects the rotation speed of the fan 20 and outputs a control signal to the first terminal of the second switch Q2 through the rotation speed pin TACH, wherein the control signal is used to control the second switch Q2 to be turned on. Therefore, the rotation speed of the fan 20 is different, and the rotation speed pin TACH of the fan controller 11 outputs control signals with different frequencies. In this way, the feedback module 13 may feed back different fan speed signals to the control module 15 according to different fan speeds of the fan 20.
The control module 15 receives the fan speed signal and the temperature signal transmitted by the temperature sensor 14, and refers to the corresponding relationship between the temperature and the fan speed stored in the fan speed look-up table.
For example, in the fan speed comparison table, the fan speed corresponding to the temperature of 40 degrees is 300 revolutions per minute, and when the control module 15 obtains that the temperature of the electronic device 100 is 40 degrees and the fan speed is only 200 revolutions per minute, the control module 15 adjusts the duty ratio of the pulse modulation signal to increase the fan speed of the fan 20. When the control module 15 obtains that the temperature of the electronic device 100 is 40 degrees and the fan speed is 400 rpm, the control module 15 adjusts the duty ratio of the pulse modulation signal to reduce the fan speed of the fan 20.
In the fan control circuit 10 and the electronic device 100 using the fan control circuit 10 provided in the above embodiments, the control module 15 obtains the temperature fed back by the temperature sensor 14 and the fan rotation speed signal fed back by the feedback module 13, and the duty ratio of the pulse width modulation signal can be correspondingly adjusted according to the fan rotation speed comparison table, so as to correspondingly adjust the rotation speed of the fan 20. Therefore, the fan control circuit 10 and the electronic device provided in the embodiment of the present application can change the fan rotation speed with the temperature change, so as to achieve the purpose of energy saving. The rotating speed of the fan can be changed along with the temperature change so as to achieve the purpose of energy conservation.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not used as limitations of the present application, and that suitable modifications and changes of the above embodiments are within the scope of the claims of the present application as long as they are within the spirit and scope of the present application.
Claims (10)
1. A fan control circuit comprises a fan controller, wherein the fan controller is electrically connected with a fan and comprises a rotating speed pin and a pulse width modulation pin;
the adjusting module is electrically connected between a pulse width modulation pin of the fan controller and the control module and used for receiving a pulse width modulation signal from the control module to adjust the rotating speed of the fan;
the feedback module is electrically connected between a rotating speed pin of the fan controller and the control module and is used for feeding back a fan rotating speed signal to the control module;
the temperature sensor is electrically connected with the control module and used for sensing the temperature of the electronic device and outputting a corresponding temperature signal to the control module; and
the control module is used for setting the corresponding relation between the temperature and the fan rotating speed and correspondingly adjusting the duty ratio of the pulse width modulation signal according to the temperature signal and the fan rotating speed signal.
2. The fan control circuit according to claim 1, wherein the adjusting module comprises a first switch, a first resistor, a second resistor, and a third resistor, a first terminal of the first switch is electrically connected to a first power source through the first resistor, a second terminal of the first switch is electrically connected to a pwm pin of the fan controller through the second resistor, a third terminal of the first switch is electrically connected to the first power source through the third resistor, and the third terminal of the first switch is further electrically connected to the control module.
3. The fan control circuit according to claim 2, wherein the feedback module includes a second switch, a fourth resistor, a fifth resistor, and a sixth resistor, a first end of the second switch is electrically connected to the rpm pin of the fan controller through the fourth resistor, a second end of the second switch is electrically connected to the first power supply through the fifth resistor, a second end of the second switch is also electrically connected to the control module through the sixth resistor, and a third end of the second switch is grounded.
4. The fan control circuit of claim 3 wherein the feedback module further comprises a seventh resistor and a first capacitor, wherein the speed pin of the fan controller is coupled to ground via the first capacitor, and wherein the speed pin of the fan controller is further coupled to the first power supply via the seventh resistor.
5. The fan control circuit of claim 4 wherein the fan controller further comprises a power pin and a ground pin, the power pin being electrically connected to a second power supply, the power pin further being grounded through a second capacitor, the ground pin being grounded.
6. The fan control circuit of claim 3, wherein the first switch and the second switch are both NPN transistors.
7. The fan control circuit according to claim 6, wherein first terminals of the first switch and the second switch are bases of the NPN transistor, second terminals of the first switch and the second switch are collectors of the NPN transistor, and third terminals of the first switch and the second switch are emitters of the NPN transistor.
8. The fan control circuit of claim 5 wherein the first power supply is configured to output a voltage of 3.3 volts and the second power supply is configured to output a voltage of 12 volts.
9. The fan control circuit of claim 1, wherein the control module is a super input output chip.
10. An electronic device comprising a fan for dissipating heat from the electronic device and a fan control circuit according to any one of claims 1 to 9 electrically connected to the fan for speed control of the fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910420291.2A CN111963469A (en) | 2019-05-20 | 2019-05-20 | Fan control circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910420291.2A CN111963469A (en) | 2019-05-20 | 2019-05-20 | Fan control circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111963469A true CN111963469A (en) | 2020-11-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910420291.2A Pending CN111963469A (en) | 2019-05-20 | 2019-05-20 | Fan control circuit and electronic device |
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| CN (1) | CN111963469A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060013571A1 (en) * | 2004-07-13 | 2006-01-19 | Squibb George F | Pulse width modulation fan control |
| CN101751053A (en) * | 2008-12-04 | 2010-06-23 | 鸿富锦精密工业（深圳）有限公司 | Fan drive circuit |
| CN103671188A (en) * | 2012-09-26 | 2014-03-26 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN204003548U (en) * | 2014-07-04 | 2014-12-10 | 深圳市金威源科技股份有限公司 | A kind of fan control circuitry of temperature regulate speed |
| CN104953900A (en) * | 2014-03-31 | 2015-09-30 | 海洋王（东莞）照明科技有限公司 | Three-phase DC fan control circuit and three-phase DC fan |
| CN205841285U (en) * | 2016-07-01 | 2016-12-28 | 深圳市金威源科技股份有限公司 | A kind of fan speed regulation control circuit |
-
2019
- 2019-05-20 CN CN201910420291.2A patent/CN111963469A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060013571A1 (en) * | 2004-07-13 | 2006-01-19 | Squibb George F | Pulse width modulation fan control |
| CN101751053A (en) * | 2008-12-04 | 2010-06-23 | 鸿富锦精密工业（深圳）有限公司 | Fan drive circuit |
| CN103671188A (en) * | 2012-09-26 | 2014-03-26 | 鸿富锦精密工业（深圳）有限公司 | Fan control circuit |
| CN104953900A (en) * | 2014-03-31 | 2015-09-30 | 海洋王（东莞）照明科技有限公司 | Three-phase DC fan control circuit and three-phase DC fan |
| CN204003548U (en) * | 2014-07-04 | 2014-12-10 | 深圳市金威源科技股份有限公司 | A kind of fan control circuitry of temperature regulate speed |
| CN205841285U (en) * | 2016-07-01 | 2016-12-28 | 深圳市金威源科技股份有限公司 | A kind of fan speed regulation control circuit |
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Application publication date: 20201120 |