CN101908013A - Pressure sensing device, pressure sensing method and heat dissipation device for electronic device - Google Patents

Abstract

The invention relates to a pressure sensing device and a pressure sensing method for an electronic device and a heat dissipation device. The pressure sensing device for the electronic device comprises a pressure sensing unit, a pressure sensing unit and a pressure sensing unit, wherein the pressure sensing unit is arranged in the electronic device and is used for detecting the fluid pressure in the electronic device so as to generate a pressure signal; the control unit is coupled with the pressure sensing unit and used for judging the change condition of the fluid pressure in the electronic device according to the pressure signal and generating a control signal; and the warning unit is coupled with the control unit and used for outputting a warning signal according to the control signal so as to execute a warning function. The invention not only can effectively improve the heat dissipation efficiency of the electronic device, but also can strengthen the working stability of the electronic device and prolong the service life of internal components of the electronic device. The invention can also detect the atmospheric pressure value of the using environment through the pressure sensing unit to immediately execute a proper heat dissipation program, so that the electronic device can exert the optimal working efficiency.

Description

Pressure sensing device, pressure sensing method and heat dissipation device for electronic device

technical field

The present invention relates to a pressure sensing device for an electronic device, a pressure sensing method thereof, and a heat dissipation device, in particular to a pressure sensing device capable of immediately notifying abnormal conditions, a pressure sensing method thereof, and a heat dissipation device.

Background technique

With the development of information technology, human life is closely related to computer systems, and people use computer systems widely and intensively no matter they work at home. Moreover, due to the advancement of computer technology, no matter it is a computer system such as a notebook computer, a desktop personal computer, or a server, in addition to the higher and higher operating frequency of the processor, the functions of each component are more and more diversified. and strong. Therefore, when the computer system is working, the accompanying heat energy also increases relatively. Once the generated heat cannot be effectively removed, it will not only affect the functioning and computing speed of the computer system and cause the system to crash, but also cause the internal components to overheat and be damaged. Overall performance has a critical impact.

Generally speaking, all kinds of computer systems are designed with complete heat dissipation devices to solve the heat dissipation problem. However, due to dust accumulation or improper use environment, the heat dissipation devices may not work normally, resulting in overheating. For example, there are usually various heat dissipation holes on the casing to provide air circulation. After a long period of use, dust will accumulate on the heat dissipation holes and affect the efficiency of air entry and exit. Dust will enter the computer with the air flow. Or pollutants will also accumulate in the heat sink and internal components, resulting in reduced heat dissipation performance. In this case, although there is a specially designed dust-proof device, it can only slow down the speed of dust accumulation negatively. Therefore, in order to make the computer system work stably, when the dust accumulates to a certain extent, the dust must be removed to facilitate the operation of the computer system. Thermal operation. In addition, when the computer system is used in an inappropriate environment, such as placing the notebook computer on the carpet and blocking the heat dissipation holes, or being too close to the wall to affect the air circulation of the heat dissipation holes, etc., it will affect the performance of the heat dissipation device. work and reduce cooling performance.

On the other hand, users often use computer devices in different environments. For example, when the user is in a high-altitude area, due to the thin air and relatively low air density, the air flow generated by the fan of the cooling device at the same speed is relatively low, which will lead to a decrease in cooling efficiency. reduce, and affect the normal operation of the computer system. However, the design of the current computer system cannot make appropriate adjustments in time as the user's operating environment changes, so that the system can exert the best working performance.

Contents of the invention

Therefore, the present invention mainly provides a pressure sensing device for an electronic device, a pressure sensing method and a heat dissipation device thereof.

The invention discloses a pressure sensing device for an electronic device, which comprises a pressure sensing unit arranged in the electronic device for detecting the fluid pressure in the electronic device to generate a pressure signal; a control unit , coupled to the pressure sensing unit, used to judge the change of the fluid pressure in the electronic device according to the pressure signal, and generate a control signal; and a warning unit, coupled to the control unit, used to The control signal outputs a warning signal to perform a warning function.

The present invention also discloses a pressure sensing method for an electronic device, which includes detecting the fluid pressure in the electronic device to generate a pressure signal; judging the change of the fluid pressure in the electronic device according to the pressure signal , and generate a control signal; and output a warning signal according to the control signal to perform a warning function.

The present invention also discloses a heat dissipation device for an electronic device, which includes a heat dissipation module installed in the electronic device for generating air flow through a fan to dissipate heat energy; a pressure sensing unit for detecting The atmospheric pressure value of the environment where the electronic device is used to generate a pressure signal; and a control unit, coupled to the pressure sensing unit and the heat dissipation module, used to judge the atmosphere in the electronic device according to the pressure signal Changes in the pressure and generate a speed control signal to control the speed of the fan.

The present invention also discloses a pressure sensing method for an electronic device, which includes detecting the atmospheric pressure value of the environment where the electronic device is used to generate a pressure signal; and judging the pressure in the electronic device according to the pressure signal Changes of atmospheric pressure, and generate a rotation speed control signal to control the rotation speed of a fan of the electronic device.

The present invention combines the pressure sensing method to detect dust accumulation and abnormal conditions in real time, and notify the user to eliminate them. In addition to effectively improving the heat dissipation performance of the electronic device, it further enhances the stability of the electronic device and prolongs the use of the internal components of the electronic device. life. In addition, the present invention can detect the atmospheric pressure value of the operating environment through the pressure sensing unit, and make appropriate adjustments accordingly, so as to execute an appropriate heat dissipation procedure in real time, so that the electronic device can exert the best working performance.

Description of drawings

FIG. 1 is a schematic diagram of a pressure sensing device for an electronic device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a pressure sensing process according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a heat dissipation device of a notebook computer according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of the appearance of a cooling hole of a notebook computer.

FIG. 5 is a schematic diagram of a heat dissipation device for an electronic device according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a pressure sensing process according to an embodiment of the present invention.

Description of main component symbols:

10 Pressure Sensing Device 308, 514 Internal Components

102, 502 pressure sensing unit 300A, 300B, 300C direction

104, 504 Control unit 304A Air intake

106 Warning unit 304B Exhaust port

20, 60 Process 306A Air Inlet

200, 202, 204, 206, 306B air outlet

208, 602, 604, 606 Steps 402 Cooling holes

30, 50 Heat Dissipation Device 506 Heat Dissipation Module

31 Laptop S _Alarm warning signal

302 Heat pipe S _C control signal

304 Cooling fins S _P Pressure signal

306, 512 Fan S _SPEED speed control signal

Detailed ways

Please refer to FIG. 1 , which is a schematic diagram of a pressure sensing device 10 for an electronic device according to an embodiment of the present invention. The electronic device can be a notebook computer, a desktop computer or a server, etc., but not limited thereto. The pressure sensing device 10 includes a pressure sensing unit 102 , a control unit 104 and an alarm unit 106 . The pressure sensing unit 102 is disposed in the electronic device for detecting the fluid pressure inside the electronic device to generate a pressure signal S _P . The control unit 104 is coupled to the pressure sensing unit 102, and is used for judging the change of the fluid pressure inside the electronic device according to the pressure signal S _P and generating a control signal S _C . The alarm unit 106 is coupled to the control unit 104 for outputting an alarm signal S _Alarm according to the control signal S _C to perform an alarm function.

For the working method of the pressure sensing device 10 , please refer to FIG. 2 . FIG. 2 is a schematic diagram of a pressure sensing process 20 according to an embodiment of the present invention. The pressure sensing process 20 includes the following steps:

Step 200: start.

Step 202: Detect the fluid pressure in the electronic device to generate a pressure signal S _P .

Step 204: According to the pressure signal S _P , determine the change of the fluid pressure in the electronic device, and generate a control signal S _C .

Step 206: Output an alarm signal S _Alarm according to the control signal S _C to execute the alarm function.

Step 208: end.

According to the process 20, the pressure sensing device 10 detects the fluid pressure in the electronic device, such as the pressure generated by air flow, to judge the condition of the air flow in the electronic device, and then generate a warning signal S _P to notify the user about the electronic device. The dust accumulation situation or the use environment state. In other words, when the dust accumulation in the electronic device or the current operating environment is sufficient to affect the heat dissipation process, the pressure sensing device 10 can detect the abnormal situation in real time, and notify the user to further perform related elimination actions.

In short, the present invention detects the fluid pressure in the electronic device to judge the air flow condition, and then takes relevant measures to avoid affecting the operation of the electronic device. It should be noted that the electronic device is not limited to any type, as long as it is a device or equipment that generates heat during operation, the concept of the present invention can be applied. For example, please refer to FIG. 3 and FIG. 4 , FIG. 3 is a schematic diagram of a cooling device 30 of a notebook computer 31 according to an embodiment of the present invention, and FIG. 4 is a schematic diagram of the appearance of a cooling hole 402 of the notebook computer 31 . Generally speaking, due to the limited internal space of the notebook computer 31, various internal components (such as the central processing unit, chip or other electronic components, etc.) are usually arranged very closely together. Therefore, the notebook computer 31 is designed with a cooling device 30 to discharge the heat generated by the internal electronic components of the notebook computer 31 through the heat dissipation holes 40 shown in FIG. 4 . In FIG. 3 , the heat dissipation device 30 includes a heat pipe 302 , a heat dissipation fin 304 and a fan 306 . The heat pipe 302 is connected to an internal component 308 of the notebook computer 31 , and transfers the heat energy generated by the internal component 308 to the cooling fin 304 through the principle of heat transfer (from high temperature to low temperature). The cooling fins 304 are connected to the other end of the heat pipe 302 for dissipating heat energy transmitted from the heat pipe 302 . The fan 306 is disposed on one side of the heat dissipation fins 304 for blowing air to the heat dissipation fins 304 to dissipate heat energy on the heat dissipation fins 304 . In detail, the fan 306 in the cooling device 30 can suck air in the direction of the arrow 300A from an air inlet 306A, and blow it out to each of the cooling fins 304 from a corresponding air outlet 306B in the direction of the arrow 300B. Air passages formed by the gaps between fin arrays. As shown in FIG. 3 , the air is blown into an air inlet 304A of the cooling fin 304 through the air outlet 306B, and is discharged from the air outlet 304B along the direction of arrow 300C. When the air is in the air channel of the heat dissipation fins 304 (during the flow from the air inlet 304A to the air outlet 304B), it will exchange heat with the heat dissipation fins 304 to absorb heat energy. The hot air after absorbing heat flows out through the exhaust port 304B, and can discharge the heat energy generated by the internal components 308 during operation, so as to achieve the purpose of heat dissipation. In this case, the present invention can place the pressure sensing unit 102 anywhere inside the notebook computer 31 to detect the pressure caused by the air flow.

For example, the pressure sensing unit 102 can be placed between the air outlet 306B side of the fan 306 and the cooling fin 304 (such as at P1 in FIG. 3 ) or at the exhaust port 304B of the cooling fin 304 ( For example, P2 in FIG. 3 ), to detect the fluid pressure caused by the air flow driven by the fan 306 . In addition, the pressure sensing unit 102 can also be placed outside (such as P1 in FIG. 4 ) or inside (not shown in FIG. 4 ) of the heat dissipation hole 402 for detection. Due to the flow of dust or pollutants through the air, they will gradually accumulate in the heat dissipation holes 402, fan 306, heat dissipation fins 304, internal components 308, etc. After a long period of accumulation, the blades of the fan 306 will accumulate due to excessive dust. The rotation speed will be slowed down, thereby affecting the heat dissipation efficiency, and the heat dissipation holes 402 and the heat dissipation fins 304 will block the flow of air due to dust accumulation, and relatively affect the flow of air driven by the fan. In this way, the flow capacity of the gas in the notebook computer 31 will be slowed down. Similarly, the value of the pressure signal S _P detected by the pressure sensing unit 102 will also decrease accordingly. Therefore, taking the pressure sensing unit 102 placed at P2 in FIG. 3 as an example, when the magnitude of the pressure signal S _P (the wind pressure value blown by the fan 306) is smaller than a first threshold _TH1 , the warning unit 106 will be based on The control signal S _C outputs an alarm signal S _Alarm to notify the user to perform the dust removal procedure. Wherein, the first threshold TH ₁ may be a preset pressure value. In addition, since the cooling holes 402 may be pressured by environmental factors (such as being blocked by carpets), the pressure signal S _P may decrease instantaneously, and the warning unit 106 may output a warning signal S _Alarm to notify the user to use it. Environmental testing procedures, such as checking whether the surroundings of the cooling holes 402 are kept clear. Preferably, the alarm unit 106 can output the alarm signal S _Alarm to a processing unit (such as a central processing unit) of the notebook computer 31 when the control signal indicates that the pressure signal S _P is smaller than the first threshold TH, and through its operating system, Executing a pop-up window function to notify the user to perform a dust removal procedure or to perform a usage environment detection procedure.

Therefore, the present invention can combine the pressure sensing method of the pressure sensing device 10 to detect dust accumulation and abnormal conditions in real time, and notify the user to eliminate them. In this way, the heat dissipation performance of the notebook computer 31 can be effectively improved, and further , further enhance the stability of the notebook computer 31 and prolong the service life of internal components.

It should be noted that, in the notebook computer 31, the internal component 308 may be a central processing unit, a chip or other electronic components, and is not limited thereto. In addition, any device capable of detecting fluid pressure can be used to realize the pressure sensing unit 102 , and the pressure sensing unit 102 can be disposed at any position inside the notebook computer 31 to detect the fluid pressure value. The number and shape of the cooling holes 402 are not limited, as long as they can be used for air in and out, it depends on the system design. The warning unit 106 can be a speaker, a light emitting diode or a vibrating unit, etc., and is used for notifying the user by sending out specific sounds, lights or vibrations when the control signal indicates that the pressure signal S _P is less than the first threshold TH ₁ .

On the other hand, users may use electronic devices in various operating environments. According to different operating environments, the present invention can adjust a suitable heat dissipation function. Please refer to FIG. 5 , which is a schematic diagram of a heat dissipation device 50 for an electronic device according to an embodiment of the present invention. The electronic device can be a notebook computer, a desktop computer or a server, etc., but not limited thereto. The heat dissipation device 50 includes a pressure sensing unit 502 , a control unit 504 and a heat dissipation module 506 . The pressure sensing unit 502 is used to detect the atmospheric pressure value of the environment where the electronic device is currently used to generate a pressure signal S _P . The control unit 504 is coupled to the pressure sensing unit 502, and is used for judging the change of the atmospheric pressure at the position of the electronic device according to the pressure signal S _P , and generating a speed control signal S _SPEED to control a fan of the cooling module 506 512 rpm. Of course, in addition to the fan 512 , the heat dissipation module 506 may also include common heat dissipation components such as heat pipes and heat dissipation fins, and the arrangement thereof may refer to FIG. 3 , which will not be repeated here. In the pressure sensing device 50 , when the pressure signal S _P measured by the pressure sensing unit 502 is smaller than a second threshold TH ₂ , the control unit 504 generates a speed control signal S _SPEED to increase the speed of the fan 512 . Wherein, the second threshold TH ₂ may be a preset atmospheric pressure value (for example, an atmospheric pressure (1 atm)). Similarly, when the pressure signal S _P measured by the pressure sensing unit 502 is greater than the second threshold TH ₂ , the control unit 504 generates a speed control signal S _SPEED to reduce the speed of the fan 512 . Besides, the pressure sensing unit 502 can be any device capable of detecting atmospheric pressure, for example, it can be a HCE pressure sensor.

Therefore, the present invention can detect the atmospheric pressure value of the operating environment through the pressure sensing unit, and make appropriate adjustments accordingly, and execute appropriate heat dissipation procedures in real time, so that the electronic device can exert the best working performance.

For the working method of the pressure sensing device 50 , please refer to FIG. 6 . FIG. 6 is a schematic diagram of a pressure sensing process 60 according to an embodiment of the present invention. The pressure sensing process 60 includes the following steps:

Step 600: start.

Step 602: Detect the atmospheric pressure of the environment where the electronic device is used to generate a pressure signal S _P .

Step 604: According to the pressure signal S _P , determine the variation of the atmospheric pressure in the electronic device, and generate a speed control signal S _SPEED to control the speed of the fan 512 .

Step 606: end.

The pressure sensing process 60 is used to illustrate the working method of the pressure sensing device. For detailed description and related changes, please refer to the foregoing description, and details are not repeated here.

In short, the present invention detects the atmospheric pressure value of the environment of the electronic device, judges the air density, and then takes related measures to make the electronic device exert the best working performance. It should be noted that the electronic device is not limited to any type, as long as it is an electronic device, equipment, etc. that generates heat during operation, the concept of the present invention can be applied. Taking a notebook computer as an example, the present invention can detect the atmospheric pressure value of the current use environment of the notebook computer through the pressure sensing unit 502, and then provide the pressure signal S _P value to the control unit 504 to judge the current use environment status . In this case, the control unit 504 can be an embedded controller (Embedded Controller, EC) or a keyboard controller (Keyboard controller, KBC) of the notebook computer. Therefore, when the control unit 504 receives the pressure signal _SP value , the value of the pressure signal S _P can be compared with a preset look-up table, for example, when the pressure signal S _P is less than atmospheric pressure, the control unit 504 will trigger a processing unit (such as a central processing unit) of the notebook computer to make the processing The unit increases the speed of the fan 512 and vice versa. In this way, the notebook computer can adjust the best heat dissipation efficiency in real time according to the change of the use environment, so that the notebook computer can perform functions stably. In contrast, in the known technology, when the user is in a high-altitude area, due to the thin air and relatively low air density, the air flow generated by the fan of the cooling device at the same speed is also relatively low, which will cause The reduction of heat dissipation efficiency affects the normal operation of the computer system.

To sum up, the present invention combines the pressure sensing method to detect dust accumulation and abnormal conditions in real time, so as to notify the user to eliminate them. In addition to effectively improving the heat dissipation performance of the electronic device, it further strengthens the stability of the electronic device and prolongs the electronic life. The service life of the internal components of the device. In addition, the present invention can detect the atmospheric pressure value of the operating environment through the pressure sensing unit, and make appropriate adjustments accordingly, so as to execute an appropriate heat dissipation procedure in real time, so that the electronic device can exert the best working performance.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the present invention.

Claims (29)

1. pressure-sensing device that is used for an electronic installation comprises:

One pressure-sensing unit is arranged in the described electronic installation, is used for detecting the hydrodynamic pressure in the described electronic installation, to produce a pressure signal;

One control module is coupled to described pressure-sensing unit, is used for judging the situation of change of the hydrodynamic pressure in the described electronic installation according to described pressure signal, and produces a control signal; And

One caution unit is coupled to described control module, is used for exporting an alarm signal according to described control signal, to carry out an alarm function.

2. pressure-sensing device as claimed in claim 1, wherein said pressure-sensing unit is arranged at the outside of a louvre of described electronic installation.

3. pressure-sensing device as claimed in claim 1, wherein said pressure-sensing unit is arranged at the inboard of a louvre of described electronic installation.

4. pressure-sensing device as claimed in claim 1 also comprises:

One heat pipe, described heat pipe one end is connected in an intraware of described electronic installation;

A plurality of radiating fins are connected in the other end of described heat pipe, are used for loosing removing the heat energy that described heat pipe transmitted; And

One fan is arranged at a side of described a plurality of radiating fins, is used for air is blowed to described a plurality of radiating fin, removes the heat energy on described a plurality of radiating fins to loose.

5. pressure-sensing device as claimed in claim 4, wherein said pressure-sensing unit are arranged between described fan and the described a plurality of radiating fin, to detect the hydrodynamic pressure that described fan is produced.

6. pressure-sensing device as claimed in claim 4, wherein said pressure-sensing unit are arranged between described a plurality of radiating fin, to detect the hydrodynamic pressure that described fan is produced.

7. when pressure-sensing device as claimed in claim 1, wherein said caution unit are indicated described pressure signal less than a first threshold in described control signal, export described alarm signal, carry out a dedusting program to notify a user.

8. pressure-sensing device as claimed in claim 1, wherein said caution unit during less than a first threshold, is exported described alarm signal at described control signal indicated pressure signal, carries out an environment for use trace routine to notify a user.

9. pressure-sensing device as claimed in claim 1, wherein said electronic installation are a computer system.

10. pressure-sensing device as claimed in claim 9, wherein said caution unit is at described control signal indicated pressure signal during less than a first threshold, export the processing unit of described alarm signal to described computer system, with a operating system by described computer system, carry out a pop-up window, notify the user to carry out dedusting program or environment for use trace routine.

11. pressure-sensing device as claimed in claim 1, wherein said caution unit is a loudspeaker.

12. pressure-sensing device as claimed in claim 11, wherein said alarm signal are a sound.

13. pressure-sensing device as claimed in claim 1, wherein said caution unit are a vibrations unit.

14. a pressure-sensing method that is used for an electronic installation comprises:

Detect the hydrodynamic pressure in the described electronic installation, to produce a pressure signal;

According to described pressure signal, judge the situation of change of the hydrodynamic pressure in the described electronic installation, and produce a control signal; And

According to described control signal, export an alarm signal, to carry out an alarm function.

15. pressure-sensing method as claimed in claim 14, wherein detect hydrodynamic pressure in the described electronic installation to produce the step of described pressure signal, be to detect the pressure that airflow is produced through a louvre of described electronic installation, to produce described pressure signal.

16. pressure-sensing method as claimed in claim 14, wherein detect hydrodynamic pressure in the described electronic installation to produce the step of described pressure signal, be the pressure that air flow produced that detects the fan drive of described electronic installation, to produce described pressure signal.

17. pressure-sensing method as claimed in claim 14, wherein export described alarm signal according to described control signal, to carry out the step of described alarm function, be at described control signal indicated pressure signal during less than a first threshold, export described alarm signal, carry out the dedusting program to notify the user.

18. pressure-sensing method as claimed in claim 14, wherein export described alarm signal according to described control signal, to carry out the step of described alarm function, be at described control signal indicated pressure signal during less than a first threshold, export described alarm signal, carry out an environment for use trace routine to notify a user.

19. pressure-sensing method as claimed in claim 14, wherein said electronic installation are a computer system.

20. pressure-sensing method as claimed in claim 19, wherein export described alarm signal according to described control signal, to carry out the step of described alarm function, be at described control signal indicated pressure signal during less than a first threshold, export the processing unit of described alarm signal to described computer system, with a operating system by described computer system, carry out a pop-up window, notify a user to carry out a dedusting program or an environment for use trace routine.

21. a heat abstractor that is used for an electronic installation comprises:

One radiating module is located in the described electronic installation, is used for producing air flow by a fan, removes heat energy to loose;

One pressure-sensing unit is used for detecting the atmospheric pressure value of described electronic installation environment for use of living in, to produce a pressure signal; And

One control module is coupled to described pressure-sensing unit and described radiating module, is used for judging the situation of change of the atmospheric pressure in the described electronic installation according to described pressure signal, and produces a speed controling signal, to control the rotating speed of described fan.

22. heat abstractor as claimed in claim 21, wherein said radiating module also comprises:

One heat pipe is connected in an intraware of described electronic installation; And

A plurality of radiating fins are connected in the other end of described heat pipe, are used for loosing removing the heat energy that described heat pipe transmitted.

23. heat abstractor as claimed in claim 22, wherein said fan are arranged at a side of described a plurality of radiating fins, are used for air is blowed to described a plurality of radiating fin, remove the heat energy on described a plurality of radiating fins to loose.

24. heat abstractor as claimed in claim 21, wherein said pressure-sensing unit are a HCE pressure sensor.

25. heat abstractor as claimed in claim 21, wherein said control module are during less than one second threshold value, to produce described speed controling signal, to improve the rotating speed of described fan at described pressure signal.

26. heat abstractor as claimed in claim 21, wherein said control module are during greater than one second threshold value, to produce described speed controling signal, to reduce the rotating speed of described fan at described pressure signal.

27. a pressure-sensing method that is used for an electronic installation comprises:

Detect the atmospheric pressure value of described electronic installation environment for use of living in, to produce a pressure signal; And

According to described pressure signal, judge the situation of change of the atmospheric pressure in the described electronic installation, and produce a speed controling signal, with the rotating speed of a fan of controlling described electronic installation.

28. pressure-sensing method as claimed in claim 27, wherein judge the situation of change of the atmospheric pressure in the described electronic installation according to described pressure signal, and produce described speed controling signal, step with the rotating speed of the described fan of controlling described electronic installation, be at described pressure signal during less than one second threshold value, produce described speed controling signal, to improve the rotating speed of described fan.

29. pressure-sensing method as claimed in claim 27, wherein judge the situation of change of the atmospheric pressure in the described electronic installation according to described pressure signal, and produce described speed controling signal, step with the rotating speed of the described fan of controlling described electronic installation, be at described pressure signal during greater than one second threshold value, produce described speed controling signal, to reduce the rotating speed of described fan.

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