CN112797018A - Fan speed control circuit, fan device and display system - Google Patents
Fan speed control circuit, fan device and display system Download PDFInfo
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- CN112797018A CN112797018A CN202110162108.0A CN202110162108A CN112797018A CN 112797018 A CN112797018 A CN 112797018A CN 202110162108 A CN202110162108 A CN 202110162108A CN 112797018 A CN112797018 A CN 112797018A
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- 238000001514 detection method Methods 0.000 claims abstract description 38
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000003071 parasitic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
- H05K7/20972—Forced ventilation, e.g. on heat dissipaters coupled to components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/303—Temperature
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
本发明涉及一种风扇调速电路、风扇装置及显示器系统。该风扇调速电路包括：温度检测模块，用于检测环境温度，且根据环境温度输出调节电压；方波生成模块，包括：三角波单元，用于生成三角波电压；方波产生单元，连接温度检测模块与三角波单元，用于将三角波电压与调节电压比较生成PWM方波信号；开关模块，连接方波产生单元以及风扇。该风扇调速电路通过将温度检测模块的输出端设置为与三角波单元进行比较的比较端，从而在方波产生单元生成可以控制开关模块通断的PWM方波信号。开关模块在PWM方波信号的控制下，可以为风扇提供具有对应占空比的电源电压，从而可以控制风扇转速，进而节约电能。
The invention relates to a fan speed regulating circuit, a fan device and a display system. The fan speed control circuit includes: a temperature detection module for detecting the ambient temperature and outputting voltage regulation according to the ambient temperature; a square wave generating module, including: a triangular wave unit for generating a triangular wave voltage; a square wave generating unit, connected to the temperature detection module The triangle wave unit is used to compare the triangle wave voltage with the regulation voltage to generate a PWM square wave signal; the switch module is connected to the square wave generation unit and the fan. By setting the output end of the temperature detection module as a comparison end for comparing with the triangular wave unit, the fan speed regulating circuit generates a PWM square wave signal in the square wave generating unit that can control the on-off of the switch module. Under the control of the PWM square wave signal, the switch module can provide the fan with a power supply voltage with a corresponding duty cycle, so that the fan speed can be controlled, thereby saving power.
Description
Technical Field
The invention relates to the technical field of electronic appliances, in particular to a fan speed regulation circuit, a fan device and a display system.
Background
Displays, especially displays used outdoors, often cause high power consumption of the machine itself due to high ambient temperature, high brightness of the machine itself, and the like. Therefore, the display may be hot after a period of operation. If the temperature can not be reduced, the reliability of the machine has certain problems, and the service life of the machine can not be effectively guaranteed.
At present, the industry practice is to install fans on two sides of the display. The fan will start as soon as the display is powered on. However, this is not energy efficient. When the temperature of the display is low, the fan is still continuously rotated at the maximum rotation speed.
Disclosure of Invention
Accordingly, there is a need for a fan speed control circuit, a fan device and a display system that can save power.
A fan speed regulation circuit comprising:
the temperature detection module is used for detecting the ambient temperature and outputting an adjusting voltage according to the ambient temperature;
a square wave generation module comprising:
a triangular wave unit for generating a triangular wave voltage;
the square wave generating unit is connected with the temperature detection module and the triangular wave unit and used for comparing the triangular wave voltage with the regulating voltage to generate a PWM square wave signal;
and the switch module is connected with the square wave generating unit and the fan.
In one embodiment, the fan speed regulation circuit further comprises a push-pull circuit, and the push-pull circuit is connected with the square wave generation unit and the switch module.
In one embodiment, the fan speed regulation circuit further comprises a current limiting module, and the current limiting module is connected with the push-pull circuit and the switch module.
In one embodiment, the switch module includes a first terminal, a second terminal and a third terminal, the first terminal is connected to the current limiting module, the second terminal is connected to the ground terminal, and the third terminal is connected to the fan.
In one embodiment, the fan speed regulation circuit further includes a pull-down resistor module, one end of the pull-down resistor module is connected to the first end, and the other end of the pull-down resistor module is connected to the second end.
In one embodiment, the current limiting module has an impedance lower than the pull-down resistor module.
In one embodiment, the temperature detection module includes a temperature detection unit and an amplification unit, the temperature detection unit is configured to detect an ambient temperature and output a feedback voltage according to the ambient temperature, and the amplification unit is connected to the temperature detection unit and configured to amplify the feedback voltage by a preset multiple to form the adjustment voltage.
In one embodiment, the fan speed regulation circuit further includes a voltage reduction module, and the voltage reduction module is connected to the temperature detection module and the square wave generation module.
A fan device comprises a fan and the fan speed regulation circuit.
A display system comprises a display and the fan device, wherein the fan device is used for cooling the display.
According to the fan speed regulation circuit, the output end of the temperature detection module is set to be the comparison end which is compared with the triangular wave unit, the regulation voltage output by the temperature detection module is compared with the triangular wave voltage generated by the triangular wave unit, and therefore the square wave generation unit generates the PWM square wave signal which can control the on-off of the switch module. The switch module can provide power supply voltage with corresponding duty ratio for the fan under the control of the PWM square wave signal, so that the rotating speed of the fan can be controlled, and electric energy is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a fan speed regulation circuit according to an embodiment;
fig. 2a is a relationship diagram of the adjustment voltage output by the temperature detection module, the triangular wave voltage output by the triangular wave unit, and the PWM square wave signal generated by the square wave generation unit when the ambient temperature is less than or equal to the first temperature threshold;
fig. 2b is a relationship diagram of the adjustment voltage output by the temperature detection module, the triangular wave voltage output by the triangular wave unit, and the PWM square wave signal generated by the square wave generation unit when the ambient temperature is greater than or equal to the first temperature threshold;
fig. 2c is a relationship diagram of the adjustment voltage output by the temperature detection module, the triangular wave voltage output by the triangular wave unit, and the PWM square wave signal generated by the square wave generation unit when the ambient temperature is greater than the first temperature threshold and less than the second temperature threshold;
fig. 3 is a schematic diagram of a voltage reduction module in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first transistor can be referred to as a second transistor, and similarly, a second transistor can be referred to as a first transistor, without departing from the scope of the present application. The first transistor and the second transistor are both transistors, but they are not the same transistor.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In one embodiment, a fan apparatus is provided. The fan device can be applied to cooling the display in the display system. Of course, the fan device may also be used to cool other electronic devices, and the application is not limited thereto.
Specifically, the fan device comprises a fan and a fan speed regulating circuit connected with the fan. The fan speed regulating circuit is used for regulating the rotating speed of the fan.
In one embodiment, referring to fig. 1, the fan speed regulation circuit includes a temperature detection module 100, a square wave generation module 200, and a switch module 300.
The temperature detection module 100 is used for detecting an ambient temperature and outputting a regulated voltage according to the ambient temperature. In particular, the ambient temperature is the temperature around the electronic device (e.g. display) which is cooled by the fan device.
The square wave generating module 200 includes a triangular wave unit 210 and a square wave generating unit 220. The triangular wave unit 210 is used to generate a triangular wave voltage. In particular, it may comprise a hysteresis comparator. Hysteresis comparators for generating triangular wave voltages are well known to those skilled in the art and will not be described in detail herein.
The square wave generating unit 220 is connected to the temperature detecting module 100 and the triangular wave unit 210, and is configured to compare the triangular wave voltage with the adjustment voltage output by the temperature detecting module 100 to generate a PWM square wave signal. The generation of the square wave by means of a triangular wave is a technical measure commonly used by those skilled in the art and will not be described in detail here.
The switch module 300 is connected to the square wave generating unit 220, and further, the PWM square wave signal generated by the square wave generating unit 220 can be used as a control signal of the switch module 300 to control the on/off of the switch module 300. Meanwhile, the switch module 300 is also connected to the fan, so that the fan can be controlled to be turned on or off, thereby controlling the rotation speed of the fan.
In the embodiment, the output end of the temperature detection module 100 is set as the comparison end for comparing with the triangular wave unit 210, and the adjustment voltage output by the temperature detection module 100 is compared with the triangular wave voltage generated by the triangular wave unit 210, so that the square wave generation unit 220 generates the PWM square wave signal capable of controlling the on/off of the switch module 300. The switching module 300 may provide a power voltage having a corresponding duty ratio to the fan under the control of the PWM square wave signal, so as to control the rotation speed of the fan and further save electric energy.
Specifically, the higher the ambient temperature, the greater the regulated voltage output by the temperature detection module 100.
As an example, when the ambient temperature is set to be equal to the first temperature threshold, the lowest value of the adjustment voltage output by the temperature detection module 100 and the triangular wave voltage output by the triangular wave unit 210; when the ambient temperature is equal to the second temperature threshold, the maximum value of the adjustment voltage output by the temperature detection module 100 and the triangular wave voltage output by the triangular wave unit 210 is reached.
Referring to fig. 2a, when the ambient temperature is less than or equal to the first temperature threshold, the regulation voltage Vout output by the temperature detection module 100 is less than or equal to the lowest value of the triangular wave voltage Vt output by the triangular wave unit 210, and the PWM square wave signal generated by the square wave generation unit 220 is always "0" (low level). At this time, the switch module 300 is turned off and the fan is turned off without being started.
Referring to fig. 2b, when the ambient temperature is greater than or equal to the second temperature threshold, the regulation voltage Vout output by the temperature detection module 100 is greater than or equal to the maximum value of the triangular wave voltage Vt output by the triangular wave unit 210, and the PWM square wave signal generated by the square wave generation unit 220 is always "1" (high level). At this time, the switch module 300 is turned on, and the fan is always turned on and thus rotates at the highest rotation speed.
Referring to fig. 2c, when the ambient temperature is greater than the first temperature threshold and less than the second temperature threshold, the adjustment voltage Vout output by the temperature detection module 100 is between the highest value and the lowest value of the triangular wave voltage Vt output by the triangular wave unit 210, and the PWM square wave signal generated by the square wave generation unit 220 has a certain duty ratio. At this time, the switching module 300 turns on and off the fan according to the duty ratio of the PWM square wave signal, so that the fan rotates at a certain rotational speed. The higher the ambient temperature is, the larger the duty ratio of the PWM square wave signal is, the faster the fan rotates, and further the stepless speed regulation can be realized along with the change of the ambient temperature by the rotating speed of the fan. Therefore, the electric energy can be reasonably utilized by the embodiment, and the electric energy is effectively saved.
It is understood that the first temperature threshold, the second temperature threshold, the triangular wave, etc. can be designed according to actual requirements. For example, the first temperature threshold may be 48 ℃. The triangle wave can be a 3.6V-5.4V20KHz triangle wave.
In one embodiment, referring to fig. 1, the fan speed regulation circuit further includes a push-pull circuit 400. The push-pull circuit 400 connects the square wave generating unit 220 and the switching module 300. The push-pull circuit 400 is arranged to effectively accelerate the control speed of the PWM square-wave signal to the switch module 300.
The push-pull circuit 400 may include a first transistor 410 and a second transistor 420 of two different polarities. The first transistor 410 is connected to a power supply, and the second transistor 420 is connected to a ground terminal.
Specifically, the first transistor 410 and the second transistor 420 may be transistors, field effect transistors, or the like.
As an example, the first transistor 410 is an NPN type transistor, and the second transistor 420 is a PNP type transistor. Alternatively, the first transistor 410 is an N-type fet and the second transistor 420 is a P-type fet.
At this time, when the PWM square wave signal is a high level signal, the first transistor 410 is turned on, and the second transistor 410 is turned off. When the PWM square wave signal is a low level signal, the first transistor 410 is turned off, and the second transistor 410 is turned on.
In one embodiment, the fan speed regulation circuit further includes a current limiting module 500. The current limiting module 500 is connected to the push-pull circuit 400 and the switch module 500, so as to prevent the switch module 500 from being burnt out due to excessive current flowing into the switch module 500.
Specifically, the current limiting module 500 may include at least one resistor. When the fan device is used to cool the display, the push-pull circuit 400 may be connected to a power terminal of the display, thereby obtaining a power voltage. At this time, when the first transistor 410 is turned on, the push-pull circuit 400 obtains a larger power voltage, so that the current flowing into the switch module 500 may be too large to burn the switch module 500.
In this embodiment, the current limiting module 500 is additionally disposed between the push-pull circuit 400 and the switch module 500, so that the current flowing to the switch module 500 can be reduced by the voltage division and current limitation of the current limiting module 500, thereby protecting the switch module 500.
In one embodiment, the switch module 300 includes a first terminal 310, a second terminal 320, and a third terminal 330. The first end 210 is connected to the current limiting module 500. The second terminal 320 is connected to the ground terminal, and the third terminal 320 is connected to the fan.
At this time, when the switch module 300 is turned on, the ground terminal of the fan is grounded through the switch module 300, thereby turning on the fan circuit and thus rotating the fan.
As an example, the switch module 300 may be an N-type field effect transistor or the like.
In one embodiment, the fan speed control circuit further comprises a pull-down resistor module 600. Specifically, the pull-down resistance module 600 may include at least one resistance.
One end of the pull-down resistor module 600 is connected to the first end 310, and the other end of the pull-down resistor module 600 is connected to the second end 320 (i.e., connected to the ground), so that the parasitic capacitance of the switch module 300 is effectively discharged when the switch module 300 is turned off.
Meanwhile, the other end of the pull-down resistor module 600 is connected to the second terminal 320, i.e., the pull-down resistor module 600 is connected to the ground terminal. At this time, if static electricity is generated when the switch module 300 is turned off, since the impedance of the pull-down resistor module 600 is smaller than that of the switch module 300, a current flows through the pull-down resistor module 600 to the ground first, so that a good static electricity prevention effect can be exerted on the switch module 300.
In one embodiment, the impedance of the current limiting module 500 is lower than the impedance of the pull-down resistor module 600.
When the switching module 300 is turned off to discharge, the first transistor 410 of the push-pull circuit is turned off, and the second transistor 420 connected to the ground terminal is turned on. Therefore, when the switch module 300 is turned off to perform discharging, the impedance of the current limiting module 500 is low, and the second transistor 420 connected to the ground terminal is turned on. Therefore, the switching module 300 may sequentially pass through the current limiting module 500 and the second transistor 420 to be discharged.
In one embodiment, the temperature detection module 100 includes a temperature detection unit 110 and an amplification unit 120.
The temperature detecting unit 110 is used for detecting an ambient temperature and outputting a feedback voltage according to the ambient temperature. Specifically, the temperature detection unit 110 may be a temperature sensor, which may detect an ambient temperature and convert a temperature signal into a feedback voltage. The higher the ambient temperature, the larger the feedback voltage.
Since the feedback voltage output from the temperature detection unit 110 such as a temperature sensor is generally small, it is difficult to generate a PWM square wave signal having a certain duty ratio by comparing with the triangular wave voltage of the triangular wave unit 210.
Therefore, the present embodiment is provided with the amplifying unit 120 connected to the temperature detecting unit 110. The amplifying unit 120 is configured to amplify the feedback voltage by a predetermined multiple to form a regulated voltage.
The specific numerical value of the preset multiple can be set according to actual needs.
In one embodiment, referring to fig. 3, the fan speed regulation circuit further includes a voltage reduction module 700. The voltage reduction module 700 is connected to the temperature detection module 100 and the square wave generation module 200, so as to provide the required power voltage for the temperature detection module and the square wave generation module.
Specifically, the voltage reduction module 700 may include a first voltage reduction unit 710 and a second voltage reduction unit 720. When the fan apparatus is used to cool the display, the voltage dropping module 700 may connect a power supply terminal of the display (the voltage at the power supply terminal is, for example, 12V), and then generate a first voltage (for example, 10.8V) through the first voltage dropping unit 710 and a second voltage (for example, 5V) through the second voltage dropping unit 720.
The second voltage reducing unit 720 may be specifically connected to the temperature detecting unit 110 and the amplifying unit 120 to supply power to the two. The first voltage-reducing unit 710 may be specifically connected to the triangular wave unit 210 to supply power thereto.
In the description herein, references to the description of "one embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110162108.0A CN112797018A (en) | 2021-02-05 | 2021-02-05 | Fan speed control circuit, fan device and display system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110162108.0A CN112797018A (en) | 2021-02-05 | 2021-02-05 | Fan speed control circuit, fan device and display system |
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| CN112797018A true CN112797018A (en) | 2021-05-14 |
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| CN202110162108.0A Pending CN112797018A (en) | 2021-02-05 | 2021-02-05 | Fan speed control circuit, fan device and display system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113915154A (en) * | 2021-10-13 | 2022-01-11 | 中国船舶重工集团公司第七0四研究所 | Fan speed regulation circuit based on temperature real-time monitoring |
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