CN116717495A - Fan noise reduction circuit based on temperature control - Google Patents
Fan noise reduction circuit based on temperature control Download PDFInfo
- Publication number
- CN116717495A CN116717495A CN202310910303.6A CN202310910303A CN116717495A CN 116717495 A CN116717495 A CN 116717495A CN 202310910303 A CN202310910303 A CN 202310910303A CN 116717495 A CN116717495 A CN 116717495A
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- Prior art keywords
- temperature
- detection circuit
- fan
- circuit
- temperature detection
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- 238000001514 detection method Methods 0.000 claims abstract description 75
- 230000017525 heat dissipation Effects 0.000 abstract description 9
- 230000005855 radiation Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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
-
- 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
-
- 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
- F04D27/007—Conjoint control of two or more different functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The application discloses a fan noise reduction circuit based on temperature control, which belongs to the technical field of fan heat dissipation and noise reduction and comprises a power supply, a first temperature detection circuit, a second temperature detection circuit, an amplifying circuit and a fan control circuit, wherein the power supply is respectively connected with the temperature detection circuit, the second temperature detection circuit, the amplifying circuit and the fan control circuit in an electric signal manner, and the fan control circuit respectively receives output signals of the first temperature detection circuit and the second temperature detection circuit through the amplifying circuit. The rotating speed of the fan is adjusted according to different temperatures by the first temperature detection circuit, and the fan is subjected to high-temperature high-rotating speed and low-temperature low-rotating speed. The fan can reduce wind noise during intermittent operation and ensure enough heat dissipation during high-strength operation. And the fan which is reduced to the safe temperature is continuously kept running for a period of time through the second temperature detection circuit, so that the service lives and the stability of the power device and the rectifying tube are protected.
Description
Technical Field
The application relates to the technical field of fan heat dissipation and noise reduction, in particular to a fan noise reduction circuit based on temperature control.
Background
At present, many household appliances are equipped with cooling fans, such as projection devices, and the projector devices generate a large amount of heat when circuits such as an optical machine, a main chip, a power supply system and the like work, so that the temperature of the whole equipment is high, and therefore the projector devices are equipped with the fans as cooling devices, noise is generated when the fan blades rotate at a high speed and are contacted with air, and the higher the rotating speed of the fans is, the stronger the cooling capability is, but the larger the generated noise is.
In the prior art, by configuring sound-producing silencing equipment, noise with opposite phases of fan noise is produced by the silencing equipment, so that the noise reduction effect is realized, but the design complexity and the cost of the system are increased in the mode. In order to overcome the problems, in the prior art, the collected environmental noise value is compared with a preset noise threshold value, and the fan rotating speed is adjusted according to the comparison result, so that the fan noise is always smaller than the noise threshold value, but the mode cannot be attached to the actual use condition, the fan rotating speed adjustment lacks flexibility, and the heat dissipation capacity of the heat dissipation fan is reduced. Meanwhile, after the heat dissipation work is finished, when the fan stops running, if the fan stops running immediately, the temperature of the node on the component can be continuously increased due to thermal inertia, and the service life and stability of the power device and the rectifying tube are affected.
Therefore, how to provide a circuit to make the fan reduce wind noise during intermittent operation and ensure enough heat dissipation during high-strength operation, and to keep the fan running for a period of time until the detected temperature is reduced to a safe temperature is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
Therefore, the application provides a fan noise reduction circuit based on temperature control, which solves the problems that the fan rotation speed adjustment lacks flexibility and the heat radiation capability of a heat radiation fan is reduced because the noise and the heat radiation of the fan cannot be taken into consideration in the prior art.
In order to achieve the above object, the present application provides the following technical solutions:
the utility model provides a fan noise reduction circuit based on temperature control, includes power, first temperature detection circuit, second temperature detection circuit, amplifier circuit and fan control circuit, the power respectively with first temperature detection circuit, second temperature detection circuit, amplifier circuit and fan control circuit electrical signal connection, fan control circuit passes through amplifier circuit receives respectively first temperature detection circuit with second temperature detection circuit's output signal.
Further, the first temperature detection circuit comprises a first temperature control switch and a second temperature control switch, the first temperature control switch and the second temperature control switch are connected in parallel, and the first temperature control switch and the second temperature control switch are connected with the power supply electric signal.
Further, the second temperature detection circuit comprises a third temperature control switch and a triode, the third temperature control switch is connected with a collector electrode of the triode, and the power supply is connected with a base electrode of the triode.
Further, the first temperature detection circuit at least comprises an on state, the power supply is in an operation state based on the fact that the first temperature detection circuit is in the on state, and the temperature of the first temperature control switch or the second temperature control switch is larger than a first temperature threshold.
Further, the first temperature detection circuit further comprises a closing state, the power supply is in an operating state based on the fact that the first temperature detection circuit is in the closing state, and the temperatures of the first temperature control switch and the second temperature control switch are smaller than a first temperature threshold.
Further, the second temperature detection circuit at least comprises a first off state, and the power supply is in an operating state based on the second temperature detection circuit being in the first off state.
Further, the second temperature detection circuit further comprises a second off state, the power supply is in a standby state based on the second off state of the second temperature detection circuit, and the temperature of the third temperature control switch is greater than a second temperature threshold.
Further, the second temperature detection circuit further comprises an on state, the power supply is in a standby state based on the fact that the second temperature detection circuit is in the on state, and the temperature of the third temperature control switch is smaller than a second temperature threshold.
Further, the first temperature control switch, the second temperature control switch and the third temperature control switch are bimetallic strip temperature control switches.
Further, a plurality of fans are arranged in the fan control circuit, and a voltage dividing component is connected in series at the port of each fan.
The application has the following advantages:
the fan noise reduction circuit comprises a power supply, a first temperature detection circuit, a second temperature detection circuit, an amplifying circuit and a fan control circuit, wherein the power supply is respectively connected with the temperature detection circuit, the second temperature detection circuit, the amplifying circuit and the fan control circuit in an electric signal mode, and the fan control circuit is respectively used for receiving output signals of the first temperature detection circuit and the second temperature detection circuit through the amplifying circuit.
According to the application, the rotating speed of the fan in the fan control circuit is regulated according to different temperatures through the first temperature detection circuit, and the high-temperature high-rotating speed and the low-temperature low-rotating speed are carried out on the fan through opening and closing of the first temperature detection circuit. The fan can reduce wind noise during intermittent operation and ensure enough heat dissipation during high-strength operation.
The fan which is reduced to the safe temperature is continuously kept running for a period of time through the second temperature detection circuit, so that the node temperature on the component is prevented from continuously rising due to thermal inertia, and the service lives and the stability of the power component and the rectifying tube are protected.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the application, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present application, should fall within the ambit of the technical disclosure.
FIG. 1 is a circuit diagram of a fan noise reduction circuit based on temperature control provided by the application;
in the figure:
1 a first temperature detection circuit; 101 a first temperature control switch; 102 a second temperature control switch; 2 a second temperature detection circuit; 201 a third temperature control switch; 202 triode; 3 an amplifying circuit; 4 a fan control circuit.
Detailed Description
Other advantages and advantages of the present application will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order to solve the problem that the fan rotation speed adjustment lacks flexibility and reduces the heat radiation capability of the heat radiation fan caused by the fact that the noise and the heat radiation of the fan cannot be compatible in the prior art, the fan noise reduction circuit based on temperature control is provided, as shown in fig. 1, and comprises a power supply, a first temperature detection circuit 1, a second temperature detection circuit 2, an amplifying circuit 3 and a fan control circuit 4, wherein the power supply is respectively connected with the first temperature detection circuit 1, the second temperature detection circuit 2, the amplifying circuit 3 and the fan control circuit 4 through electric signals, and the fan control circuit 4 respectively receives output signals of the first temperature detection circuit 1 and the second temperature detection circuit 2 through the amplifying circuit 3.
The first temperature detection circuit 1 comprises a first temperature control switch 101 and a second temperature control switch 102, the first temperature control switch 101 and the second temperature control switch 102 are connected in parallel, and the first temperature control switch 101 and the second temperature control switch 102 are connected with a power supply electric signal. The application adjusts the rotation speed of the fan in the fan control circuit 4 according to different temperatures through the first temperature detection circuit 1, and carries out high-temperature high-rotation speed and low-temperature low-rotation speed on the fan through opening and closing of the first temperature detection circuit 1. The fan can reduce wind noise during intermittent operation and ensure enough heat dissipation during high-strength operation.
The second temperature detection circuit 2 comprises a third temperature control switch 201 and a triode 202, the third temperature control switch 201 is connected with a collector electrode of the triode 202, and a power supply is connected with a base electrode of the triode 202. The fan which is reduced to the safe temperature is continuously kept to run for a period of time through the second temperature detection circuit 2, so that the node temperature on the component is prevented from continuously rising due to thermal inertia, and the service lives and the stability of the power component and the rectifying tube are protected.
When the power supply is in an operating state, the fan in the fan control circuit 4 rotates, and the first temperature threshold is set between 40 and 120 ℃. When the temperature value detected by the first temperature control switch 101 or the second temperature control switch 102 is greater than the first temperature threshold value, the first temperature detection circuit 1 is in an on state. When the temperature values detected by the first temperature control switch 101 and the second temperature control switch 102 are both smaller than the first temperature threshold value, the first temperature detection circuit 1 is in an off state. When the power supply is in an operation state, standby_by in the second temperature detection circuit 2 is at a low level, the triode 202V is turned off, the third temperature control switch 201 is not in effect, and the second temperature detection circuit 2 is in a first off state.
The first temperature control switch 101 and the second temperature control switch 102 are normally open temperature switches, the working principle of the temperature switches is that the bimetallic strip is mechanical, and the bending degree of the bimetallic strip is changed at different temperatures due to different thermal expansion coefficients and different expansion and contraction degrees of the two sides when the temperature of the bimetallic strip is changed. After the first temperature threshold of the metal sheet is set, the first temperature control switch 101 and the second temperature control switch 102 are in an off state. When the temperature is higher than the expansion temperature of the set bimetallic strip, the contact point position of the bimetallic strip is restored to be closed, the switch is conducted, and the circuit is closed.
In the first temperature detection circuit 1, a first temperature control switch 101 and a second temperature control switch 102 are connected in series with a 100 ohm resistor. When the first temperature control switch 101 and the second temperature control switch 102 are both smaller than the first temperature threshold, the voltage on the fan isWhen one of the first temperature control switch 101 and the second temperature control switch 102 is higher than the first temperature threshold, the first temperature control switch 101 or the first temperature control switch 101 is turned on, and the resistance after the parallel connection of 6.8K and 100 ohms is 99 ohms, so the voltage on the fan is +.>Therefore, the automatic switching of the high speed and the low speed of the fan at the high temperature and the low speed is realized, namely the rotating speed of the fan at the high temperature is high, and the rotating speed of the fan at the low temperature is low.
When the power supply is in a standby state, the fan in the fan control circuit 4 still keeps rotating through the second temperature detection circuit 2, the rotating speed is reduced, and the second temperature threshold is set between 40 ℃ and 90 ℃. When the power supply is in a standby state, standby_by in the second temperature detection circuit 2 is high, and the transistor 202 is turned on. When the temperature of third temperature-controlled switch 201 is greater than the second temperature threshold, second temperature detection circuit 2 is in the second off state. When the temperature of third temperature-controlled switch 201 is less than the second temperature threshold, second temperature detection circuit 2 is in an on state.
Third temperature-controlled switch 201 is in an off state when it is greater than the second temperature threshold. The working principle of the temperature switch is that the bimetallic strip is mechanical, when the temperature threshold value of the metal strip is set, the temperature switch is in a normally closed conduction state, when the temperature is higher than the expansion temperature of the bimetallic strip, the contact point of the bimetallic strip is deformed to be disconnected, the switch is disconnected, and the circuit is disconnected. At this time, the voltage on the fan was reduced from 23.8V to 14.3V with the decrease in temperature, and the fan was reduced from high speed to low speed. When the constant temperature is reduced below the second temperature threshold, the bimetallic contact point in the switch is restored to be closed, the normally closed temperature switch connected to the third temperature control switch 201 is turned on, and the circuit is turned on, at this time, the voltage on the fan is reduced to 0V, and the fan stops running. The problems that the temperature of the nodes on the components can be continuously increased due to thermal inertia to influence the service lives and the stability of the power device and the rectifying tube are avoided. The fan continues to operate for a period of time, and the fan is not stopped until the detected temperature is reduced below the safe temperature.
The first temperature control switch 101, the second temperature control switch 102 and the third temperature control switch 201 are wind speed aluminum radiators or heating components.
The fan control circuit 4 is provided with a plurality of fans, and the ports of the fans are connected in series with a voltage dividing component. The rated current difference of each fan is 20-80%, and the resonance noise generated when a plurality of fans work simultaneously can be effectively solved.
The method comprises the following steps: fans with different rated operating currents of 2 or more are adopted, for example, 1 0.15A and 1 0.75A or 2 0.75A.
The second method is as follows: resistors or diodes may also be connected in series in the CN5 and CN7 fans to power the 2 and 2 or 1 and 1 port lines. The principle is that the voltage is reduced, the resistor voltage is reduced according to R=U/I, U is the voltage to be reduced, I is the working current of the electric fan, the direct current fan is generally marked with rated working current, but the actual working current is reduced along with the voltage reduction. Diode deceleration is achieved by using its forward conduction drop, i.e., one diode voltage per string is reduced by about 0.6 volts.
While the application has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the application and are intended to be within the scope of the application as claimed.
Claims (10)
1. The utility model provides a fan noise reduction circuit based on temperature control, its characterized in that includes power, first temperature detection circuit (1), second temperature detection circuit (2), amplifier circuit (3) and fan control circuit (4), the power respectively with first temperature detection circuit (1), second temperature detection circuit (2), amplifier circuit (3) and fan control circuit (4) electrical signal connection, fan control circuit (4) pass through amplifier circuit (3) are received respectively first temperature detection circuit (1) with the output signal of second temperature detection circuit (2).
2. The temperature control-based fan noise reduction circuit according to claim 1, wherein the first temperature detection circuit (1) includes a first temperature control switch (101) and a second temperature control switch (102), the first temperature control switch (101) and the second temperature control switch (102) are connected in parallel, and the first temperature control switch (101) and the second temperature control switch (102) are electrically connected with the power supply.
3. The fan noise reduction circuit based on temperature control according to claim 2, wherein the second temperature detection circuit (2) comprises a third temperature control switch (201) and a triode (202), the third temperature control switch (201) is connected with a collector of the triode (202), and the power supply is connected with a base of the triode (202).
4. The fan noise reduction circuit based on temperature control according to claim 2, wherein the first temperature detection circuit (1) includes at least an on state, and the power supply is in an operation state based on the first temperature detection circuit (1) being in an on state, and a temperature of the first temperature control switch (101) or the second temperature control switch (102) is greater than a first temperature threshold.
5. The fan noise reduction circuit based on temperature control according to claim 2, wherein the first temperature detection circuit (1) further includes an off state, and the power supply is in an operating state based on the first temperature detection circuit (1) being in the off state, and the temperatures of the first temperature control switch (101) and the second temperature control switch (102) are both less than a first temperature threshold.
6. A fan noise reduction circuit based on temperature control according to claim 3, characterized in that the second temperature detection circuit (2) comprises at least a first off state and the power supply is in an operating state based on the second temperature detection circuit (2) being in the first off state.
7. A fan noise reduction circuit based on temperature control as claimed in claim 3, characterized in that the second temperature detection circuit (2) further comprises a second off state, and that the power supply is in a standby state and the temperature of the third temperature controlled switch (201) is greater than a second temperature threshold based on the second off state of the second temperature detection circuit (2).
8. A fan noise reduction circuit based on temperature control as claimed in claim 3, characterized in that the second temperature detection circuit (2) further comprises an on state, and the power supply is in a standby state and the temperature of the third temperature controlled switch (201) is less than a second temperature threshold value based on the second temperature detection circuit (2) being on.
9. A fan noise reduction circuit based on temperature control as claimed in claim 3, characterized in that the first temperature controlled switch (101), the second temperature controlled switch (102) and the third temperature controlled switch (201) are bimetallic temperature controlled switches.
10. A fan noise reduction circuit based on temperature control according to claim 1, characterized in that a plurality of fans are arranged in the fan control circuit (4), and a voltage dividing component is connected in series at the ports of the fans.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310910303.6A CN116717495A (en) | 2023-07-24 | 2023-07-24 | Fan noise reduction circuit based on temperature control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310910303.6A CN116717495A (en) | 2023-07-24 | 2023-07-24 | Fan noise reduction circuit based on temperature control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116717495A true CN116717495A (en) | 2023-09-08 |
Family
ID=87871709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310910303.6A Pending CN116717495A (en) | 2023-07-24 | 2023-07-24 | Fan noise reduction circuit based on temperature control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116717495A (en) |
-
2023
- 2023-07-24 CN CN202310910303.6A patent/CN116717495A/en active Pending
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