KR20070063691A - Apparatus and method for radiating heat in eletronic device - Google Patents

Abstract

An apparatus for cooling an electronic device and a method therefor are provided to increase a cooling speed by increasing a rotation speed of a cooling fan for system cooling. An apparatus for cooling an electronic device includes a temperature detection unit(170), a noise detection unit(300), a control unit(110), and a cooling unit(180). The temperature detection unit(170) detects an internal temperature of an electronic device. The noise detection unit(300) detects a noise level of a circumference under an operation environment of the electronic device. The control unit(110) outputs a control signal to drop a temperature of the electronic device if the internal temperature of the detected electronic device is higher than a predetermined temperature. The cooling unit(180) performs cooling to drop the temperature of the electronic device according to the temperature and the noise level by receiving the control signal of the control unit(110).

Description

Apparatus and method for radiating heat in eletronic device

1 is a view showing a fibrous system equipped with a cooling device according to the prior art

2 is a view showing the relationship between the temperature of the electronic device and the cooling fan driving speed in the cooling device of the electronic device according to the prior art

3 is a view showing a PVR system to which a cooling device of an electronic device according to the present invention is applied.

4 is a view showing the relationship between the temperature of the electronic device and the cooling fan driving speed in the cooling device of the electronic device according to the present invention;

5 is a flowchart illustrating a method of driving a cooling device of an electronic device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110: control unit 120: storage unit

130: analog input processor 140: digital input processor

150: stream control unit 160: output signal processing unit

170: temperature detection unit 180: cooling unit

300: noise detector 301: noise sensor

302: A / D conversion unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device and a cooling method of an electronic device, and more particularly, to a cooling device and a method of an electronic device to improve cooling efficiency in consideration of a noise level in an AV device.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include liquid crystal displays (hereinafter referred to as "LCDs"), field emission displays, plasma display panels (hereinafter referred to as "PDPs") and electro lumines. And an electroluminescent (EL) display device.

The flat panel display generates high temperature heat while driving. In particular, since a large LCD TV consumes a lot of power and generates a great amount of heat during operation, it is necessary to dissipate heat quickly for stable operation. In a unit device such as EL, an inert oil having a high thermal conductivity is placed in an element such as EL to cool the heat in order to lower the temperature raised due to the generation of heat.

In addition, in order to cool the heat generated by the central processing unit (CPU), such as a computer to install a cooling device using a cooling fan (fan) to heat the heat generated outside.

On the other hand, digital AV (Audio / Video) equipment employs a processor having a high processing speed for processing a large amount of data. In the case of adopting a processor having a high processing speed as described above, the temperature inside the product increases as the processing speed improves. For stable operation of the electronic device, heat is transferred to the outside to maintain the temperature inside the product below a certain temperature. It is necessary to perform cooling treatment such as discharge.

As described above, in order to ensure stable and efficient operation of the product, it is essential to effectively dissipate heat generated during the operation of the electronic device. Therefore, how to efficiently dissipate the generated heat to the outside to cool the product can be seen as the core of product development.

In order to effectively perform such cooling treatment, a cooling fan or a heat sink is commonly used in electronic products. The heat sink is limited in preventing the temperature rise of the electronics, and the cooling fan is more effective in the cooling treatment.

1 is a view showing a fibral system having a cooling device according to the prior art, Figure 2 is a view showing the relationship between the temperature of the electronic device and the cooling fan driving speed in the cooling device of the electronic device according to the prior art. to be.

Referring to FIG. 1, a personal Vidoe Recodrer (PVR) system equipped with a cooling apparatus according to the related art includes a control unit 110, a storage unit 120, an analog input processing unit 130, And a digital input processor 140, a stream controller 150, an output signal processor 160, a temperature detector 170, and a cooler 180.

The control unit 110 controls the overall operation of the system, including the heat radiation operation of the system.

The storage unit 120 includes a memory and a mass storage device such as a hard disk driver (HDD) or a digital versatile disk (DVD). The storage unit 120 stores system data, multimedia data including video and audio, and other user data. Perform I / O.

The analog input processor 130 includes an NTSC decoder 131 and an MPEG encoder 132, and converts an input analog signal into a high quality audio / video digital data stream and outputs it.

The digital input processor 140 includes a tuner 141 and a VSB demodulator 142 and demodulates and outputs a high quality audio / video digital data stream from the input digital signal.

The stream controller 150 selectively outputs the digital data stream output from the analog input processor 130 and the digital input processor 140 under the control of the controller 110.

The output signal processor 160 includes a transport stream (TS) demux 161, an amplifier decoder and a graphic processor 162, and processes an output signal of the stream controller 150 to process an analog audio / video signal. Outputs

The temperature detector 170 detects the internal temperature of the system and outputs the detected temperature data to the controller 110.

The cooling unit 180 cools the system according to the control signal of the control unit 110 when the internal temperature of the electronic device is above a predetermined temperature. To this end, the cooling unit 180 may form a cooling fan 182 for forming an air flow for dissipating heat generated in the system to the outside, and the cooling fan 182 according to a control signal of the controller 110. A cooling fan control unit 181 for driving at a speed is provided.

Looking at the operation of the FB system equipped with a cooling apparatus according to the prior art configured as described above, which is received through the analog input processing unit 130 and the digital input processing unit 140 under the control of the control unit 110. High-speed data processing in the operation of the output signal processor 160 for processing the broadcast signal and the operation of the stream controller 150, the output signal processor 160, and the storage 120 according to a recording and playback command of the user. This generates a lot of heat.

 In this case, when the internal temperature of the system detected by the temperature detector 170 exceeds a predetermined temperature, the controller 110 applies a control signal for cooling the system to the cooling unit 180 to cool the system. That is, the cooling fan controller 181 of the cooling unit 180 outputs a predetermined voltage as a driving signal of a predetermined cooling fan 182 according to temperature according to a control signal for system cooling of the controller 110. The cooling fan 182 rotates at a speed corresponding to the driving voltage to form airflow, thereby releasing heat generated from the system to the outside to cool the system.

The cooling fan driving voltage output from the cooling fan controller 181 increases in proportion to the detected system internal temperature. As a result, the driving speed of the cooling fan 182 also increases as the detected system internal temperature increases.

Referring to FIG. 2, when the detected system internal temperature is To, the cooling fan 182 starts to rotate at a speed of Vo to start cooling, and when the detected system internal temperature is Tt, the cooling fan 182 is Vt. By increasing the speed of rotation, the system cools the system faster by increasing the efficiency of dissipating heat inside the system to the outside.

However, when the internal temperature of the system is greater than or equal to Tt, if the speed of the cooling fan 182 is increased to increase the cooling effect, the noise generated by the rotation of the cooling fan 182 is increased, and as a result, the noise is limited. Since the specification (No) is exceeded, the rotational speed of the cooling fan 182 is inevitably limited to satisfy the noise standard of the electronic device.

In particular, in order to prevent degradation of the audio output quality due to the rotational speed of the cooling fan 182 in a product in which audio output quality is important, such as an A / V device, the noise limiting standard (No) becomes more sensitive.

The present invention provides a cooling device and a cooling method of an electronic device to increase the cooling efficiency by further increasing the rotational speed of the cooling fan for cooling the system according to the ambient noise level in the environment in which the electronic device is used. There is a purpose.

In particular, the present invention considers the noise level output from the AV device together with the cooling device of the electronic device to increase the cooling efficiency by further increasing the rotational speed of the cooling fan for the system cooling when the overall noise level is high; Its purpose is to provide a cooling method.

In order to achieve the above object, an apparatus for cooling an electronic device includes a temperature detector for detecting an internal temperature of the electronic device, a noise detector for detecting an ambient noise level in an environment in which the electronic device is operated; A controller for outputting a control signal for lowering the temperature of the electronic device when the detected internal temperature of the electronic device is higher than a predetermined temperature, and receiving the control signal of the controller to adjust the temperature of the electronic device according to the temperature and the noise level. It characterized in that it comprises a cooling unit for performing the cooling to drop.

The noise detection unit includes a noise sensor for detecting a noise level in the surroundings, and an AD converter for converting the noise level detected by the noise sensor into a digital signal and outputting the digital signal.

The noise detection unit includes a noise sensor for detecting a noise level in the surroundings, and an AD converter for converting and outputting an overall noise level including the audio output level of the electronic device and the noise level detected by the noise sensor into a digital signal. It is done.

The cooling unit includes a cooling fan for forming an air flow for dissipating heat of the electronic device to the outside, and a cooling fan controller for receiving a control signal from the controller and outputting a driving voltage corresponding to a temperature and a noise level to the cooling fan. Characterized in that it comprises a.

According to another aspect of the present invention, there is provided a method of driving a cooling device for an electronic device, the method including: a first driving step of driving a cooling fan within a first set speed limit when a system internal temperature reaches a cooling device driving temperature; When the internal temperature exceeds a predetermined threshold temperature, the ambient noise level is detected, and when the detected ambient noise level exceeds the set level, the driving unit increases the rotational speed of the cooling fan at a predetermined rotation speed exceeding the set first speed limit. Characterized in that it comprises a two drive step.

The first driving step may include detecting a system internal temperature according to an operation of an electronic device, determining whether the detected temperature reaches a cooling device driving temperature, and as a result of determining the cooling device driving temperature. And driving the cooling fan within the set first speed limit, and determining whether the system internal temperature is lower than the cooling device driving temperature after a predetermined time since the cooling fan is driven.

Determining whether the internal temperature of the system is equal to or lower than a cooling device driving temperature, and when the driving temperature is lower than the cooling temperature, stopping the driving of the cooling fan.

The second driving step may include determining whether the system internal temperature is greater than or equal to a predetermined threshold temperature, and if the determination result is greater than or equal to a predetermined threshold temperature, detect whether the ambient noise level exceeds a predetermined reference value. And determining the driving speed by increasing the rotational speed of the cooling fan at a predetermined rotational speed exceeding the set first speed limit when the ambient noise level exceeds a predetermined reference value. .

The method may further include driving the cooling fan at a rotation speed within the set first speed limit when the ambient noise level does not exceed the set reference value.

In the driving step of increasing the rotational speed of the cooling fan, the rotational speed of the cooling fan is characterized in that it does not exceed the second set speed limit.

According to the cooling apparatus of the electronic device and the driving method thereof according to the present invention configured as described above, when the ambient noise level detected by detecting the ambient noise level in the noise detection unit exceeds the set level, the speed beyond the conventional cooling fan speed limit The furnace cooling fan can be driven, thereby improving the cooling rate of the electronic device.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the cooling apparatus of the electronic device and a driving method thereof.

3 is a view showing a PVR system to which a cooling device of an electronic device according to the present invention is applied, and FIG. 4 is a view showing a relationship between a temperature of the electronic device and a cooling fan driving speed in the cooling device of the electronic device according to the present invention. 5 is a flowchart illustrating a method of driving a cooling device of an electronic device according to the present invention.

Referring to FIG. 3, the PVR system to which the cooling apparatus of the electronic device according to the present invention is applied includes a control unit 110, a storage unit 120, an analog input processing unit 130, a digital input processing unit 140, And a stream controller 150, an output signal processor 160, a temperature detector 170, a cooler 180, and a noise detector 300.

The control unit 110 controls the overall operation of the system, including the heat radiation operation of the system.

The storage unit 120 includes a memory and a mass storage device such as a hard disk driver (HDD) or a digital versatile disk (DVD). The storage unit 120 stores system data, multimedia data including video and audio, and other user data. Perform I / O.

The analog input processor 130 includes an NTSC decoder 131 and an MPEG encoder 132, and converts an input analog signal into a high quality audio / video digital data stream and outputs it.

The digital input processor 140 includes a tuner 141 and a VSB demodulator 142 and demodulates and outputs a high quality audio / video digital data stream from the input digital signal.

The stream controller 150 selectively outputs the digital data stream output from the analog input processor 130 and the digital input processor 140 under the control of the controller 110.

The output signal processor 160 includes a transport stream (TS) demux 161, an amplifier decoder and a graphic processor 162, and processes an output signal of the stream controller 150 to process an analog audio / video signal. Outputs

The temperature detector 170 detects the internal temperature of the system and outputs the detected temperature data to the controller 110.

The noise detector 300 detects the ambient noise level in an environment in which the electronic device operates, converts the detected noise level into digital data, and outputs the converted noise level to the controller 110.

The noise detector 300 includes a noise sensor 301 for detecting a noise level in the surroundings, and an AD converter 302 for converting the noise level detected by the noise sensor into a digital signal and outputting the digital signal. Alternatively, the noise detection unit 300 converts the total noise level of the noise sensor 301 that detects the ambient noise level, the audio output level of the electronic device, and the noise level detected by the noise sensor into a digital signal, and outputs the digital signal. It may be configured with an AD conversion unit 302 to.

The cooling unit 180 performs an operation for cooling the system according to the system internal temperature and the noise level according to the control signal of the controller 110 when the internal temperature of the electronic device is above a predetermined temperature. To this end, the cooling unit 180 may form a cooling fan 182 for forming an air flow for dissipating heat generated in the system to the outside, and the cooling fan 182 according to a control signal of the controller 110. A cooling fan control unit 181 for driving at a speed is provided. The cooling fan 182 may be provided in plural, and in order to improve the efficiency of the cooling fan 182, a plurality of heat sinks may be provided on a substrate equipped with a signal processor that generates a large amount of heat in a FV system. It is preferable.

Hereinafter, an operation of a fibral system having a cooling device according to the present invention configured as described above and a method of driving a cooling device for an electronic device according to the present invention will be described.

First, the operation of the output signal processor 160 for processing the broadcast signal received through the analog input processor 130 and the digital input processor 140 under the control of the controller 110, and recording and playback of the user. During the operation of the stream controller 150, the output signal processor 160, and the storage 120 according to the command, a lot of heat is generated due to the high speed data processing.

 As described above, when the internal temperature of the system exceeds a predetermined temperature due to a large amount of heat generated by the operation of the system, the controller 110 controls the cooling fan controller 181 of the cooling unit 180 according to the internal temperature of the system and the noise level. The control signal for cooling the system is applied.

The cooling fan controller 181 of the cooling unit 180 outputs a predetermined voltage as a driving signal for driving the cooling fan according to the system internal temperature and the noise level according to the control signal for system cooling of the controller 110. In addition, the cooling fan 182 rotates at a speed corresponding to the driving voltage to form an airflow for dissipating heat to release heat generated in the system to the outside to cool the system.

As described above, the cooling device of the electronic device according to the present invention drives the cooling fan 182 according to the system internal temperature and the noise level.

Referring to FIG. 4, when the system internal temperature at which the system's cooling system starts to operate is less than or equal to Tt, the cooling system 182 starts to rotate at a speed of Vo when the internal system temperature is detected as To. When the system starts to be driven and the detected system internal temperature is Tt, the cooling fan 182 rotates at a speed of Vt to rotate to increase the efficiency of dissipating heat inside the system to cool the system more quickly. Doing. As such, in the section where the system internal temperature is lower than To to Tt, the cooling fan rotation speed is controlled according to the system internal temperature, so the corresponding section is called a temperature control section.

However, when the internal temperature of the system is above Tt, the driving speed of the cooling fan may be increased to a certain degree in order to increase the cooling effect. In other words, if the noise level of the conventional noise limiting standard (No) and the system's audio output level and the external environment's noise level exceed a certain level, the allowable noise level by the cooling fan can be increased by the corresponding noise.

That is, if the audio output level generated by the system and the noise level of the external environment appear as ΔN higher than the noise level in the daily environment during system operation, the conventional noise limit standard that allows the noise limit caused by the rotation of the cooling fan (No. It is possible to increase the driving speed up to the rotational speed Vn, which is higher than?). In this way, when the internal temperature of the system is greater than or equal to Tt, the cooling fan rotation speed is controlled according to the internal temperature of the system and the noise level, so the corresponding section is called a temperature / noise control section.

As described above, even when the system internal temperature becomes Tt or more, the system can be cooled faster by increasing the driving speed of the cooling fan in proportion to the system internal temperature to the speed allowed by the noise level ΔN.

A method for driving the cooling apparatus of the electronic device according to the present invention as described above will be described with reference to FIG.

First, as the system starts operation (S510), a lot of heat is generated due to high speed data processing.

The temperature detector 170 detects the system internal temperature at predetermined time intervals and outputs the information about the detected system internal temperature to the controller 110 (S520).

The controller 110 determines whether the detected system internal temperature reaches an initial driving temperature To for driving the cooling device (S530).

As a result of the determination (S530), when the detected system internal temperature does not reach the initial driving temperature To for driving the cooling device, determining whether the initial driving temperature To is reached again after a predetermined time without driving the cooling device. (S530) is repeatedly performed.

However, when the determination result (S530), the detected system internal temperature reaches the initial drive temperature To for driving the cooling device, the rotation starts from the speed of the initial drive speed Vo to start driving the cooling device (S540).

If the system internal temperature exceeds the initial drive temperature To and does not exceed the first noise limit temperature Tt, as shown in Fig. 4, the system internal temperature is changed from the initial drive speed Vo to the speed between the first noise limit speed Vt. Proportionally increasing the rotational speed of the cooling fan 182 to drive the system cooling device.

Meanwhile, although the rotation speed of the cooling fan 182 may be continuously increased in proportion to the internal temperature of the system as described above, the noise limiting temperature Tt is divided into predetermined temperature sections at the initial driving temperature To with respect to the internal system temperature. The rotational speed of the cooling fan 182 may be discontinuously increased by setting the rotational speed of the cooling fan corresponding to the temperature section.

After the cooling fan 182 rotates for a predetermined time according to the start of driving the cooling device (S540), it is determined whether the internal temperature of the system has dropped below the initial driving temperature To due to the cooling device operation (S550).

As a result of the determination (S550), when the system internal temperature drops below the initial driving temperature To, the driving of the cooling fan is stopped (S560). Thereafter, the process of determining whether the internal temperature of the system reaches the initial driving temperature To for driving the cooling device at a predetermined time interval is performed again (S530).

However, when the determination result (S550), the internal temperature of the system does not fall below the initial driving temperature To, the internal temperature of the system is increased so that the noise limit temperature or the rotational speed of the cooling fan 182 is the first noise limit speed (Vt). It is determined whether to reach (S570).

As a result of the determination (S570), when the internal temperature of the system does not reach the noise limit temperature Tt or the rotation speed of the cooling fan 182 reaches the first noise limit speed Vt, the cooling device is driven within the first noise limit speed. Continue (S540).

However, when the determination result (S570), the system internal temperature rises to the noise limit temperature (Tt) and the rotational speed of the cooling fan 182 reaches the first noise limit speed (Vt), according to the ambient noise level In order to determine whether the rotation speed of the cooling fan 182 can be further increased, the noise detector 300 first detects an ambient noise level (S580).

When the noise sensor 301 of the noise detector 300 detects the ambient noise level in an environment in which the electronic device operates, the detected noise level is converted into digital data by the AD converter 302 of the noise detector 300. It is converted and input to the controller 110.

On the other hand, the noise detector 300 may detect the ambient noise level in the noise sensor 301 and convert only the noise level into a digital signal to output the control unit 110, but the surroundings detected by the noise sensor 301 Digital data conversion processing may be performed on the total noise level obtained by adding the noise level and the audio output level output from the system and output to the controller 110.

When the controller 110 receives an ambient noise level value according to the detecting of the ambient noise level (S580), the controller 110 determines whether the detected ambient noise level is equal to or greater than a set reference value (S590).

The set reference value may use an average noise level value in a daily environment, or may use a noise limit standard (No).

As a result of the determination (S590), when the detected ambient noise level is lower than or equal to the set reference value, the rotational speed of the cooling fan 182 is changed to the first noise limiting speed Vt when the system internal temperature exceeds the noise limiting temperature Tt. In operation (S540).

However, when the determination result (S590), the detected ambient noise level exceeds the set reference value, by increasing the rotation speed of the cooling fan 182, as shown in Figure 4, the cooling fan 182 1 The cooling device is operated at a speed exceeding the noise limit speed (Vt) (S595).

In this case, as shown in FIG. 4, although the rotation speed of the cooling fan 182 may be continuously increased in proportion to the system internal temperature with respect to the noise limiting speed Vt, the system cooling device may be driven. The internal temperature exceeding the temperature Tt may be divided into predetermined sections and the rotation speed of the cooling fan corresponding to the corresponding temperature section may be set to discontinuously increase the rotation speed of the cooling fan 182.

On the other hand, even if the cooling device operates at a speed exceeding the first noise limiting speed (Vt) as described above, in order to ensure the audio output in the A / V equipment, the speed at which the cooling fan 182 operates at a constant temperature It is preferable to limit it to a constant speed (second noise limiting speed: Vn) corresponding to (second noise limiting temperature: Tn). That is, even if the temperature exceeds the predetermined temperature (second noise limit temperature: Tn), the speed at which the cooling fan 182 operates is fixed at a constant speed (second noise limit rate: Vn).

After the cooling fan 182 operates at a speed exceeding the first noise limiting speed Vt (S595), after a predetermined time, whether the internal temperature of the system has dropped below the initial driving temperature To due to the operation of the cooling device. If it is determined again that the internal temperature of the system falls below the initial driving temperature To, the step of stopping the driving of the cooling fan (S560) is repeatedly performed.

The cooling apparatus for the electronic device and the driving method thereof according to the present invention have been described in detail above. However, the present invention is not limited to the above embodiments, and many modifications are possible by those skilled in the art within the spirit of the present invention. Therefore, changes and modifications are included in the present invention without departing from the spirit of the invention, such facts will be apparent to those skilled in the art.

According to the present invention has an effect that can increase the cooling efficiency by increasing the rotational speed of the cooling fan for cooling the system further in accordance with the ambient noise level in the environment in which the electronic device is used.

In particular, the present invention has the effect of further increasing the rotational speed of the cooling fan for cooling the system when the overall noise level is high in consideration of the noise level output from the AV device to further increase the cooling speed.

The present invention can quickly discharge the heat generated from the inside of the electronic device to the outside during the driving of the electronic device can stably drive the system and has the effect of maintaining the life of the electronic device for a long time.

Claims (10)

A temperature detector for detecting an internal temperature of the electronic device; A noise detector for detecting ambient noise levels in an environment in which the electronic device operates; A controller for outputting a control signal for lowering the temperature of the electronic device when the detected internal temperature of the electronic device is higher than a predetermined temperature; A cooling unit configured to receive a control signal from the control unit and perform cooling to lower the temperature of the electronic device according to a temperature and a noise level; Cooling device of an electronic device, characterized in that configured to include. The method of claim 1, wherein the noise detection unit, A noise sensor for detecting a noise level in the surroundings; An AD converter converting the noise level detected by the noise sensor into a digital signal and outputting the digital signal; Cooling apparatus of an electronic device comprising a. The method of claim 1, wherein the noise detection unit, A noise sensor for detecting a noise level in the surroundings; An AD converter for converting the total noise level of the sum of the audio output level of the electronic device and the noise level detected by the noise sensor into a digital signal and outputting the digital signal; Cooling apparatus of an electronic device comprising a. The method of claim 1, wherein the cooling unit, A cooling fan for forming an airflow for dissipating heat of the electronic device to the outside; A cooling fan controller configured to receive a control signal from the controller and output a driving voltage corresponding to a temperature and a noise level to the cooling fan; Cooling apparatus of an electronic device, characterized in that comprises a. A first driving step of driving the cooling fan within the set first speed limit when the system internal temperature reaches the cooling device driving temperature; When the internal temperature of the system exceeds a predetermined threshold temperature, the ambient noise level is detected. When the detected ambient noise level exceeds the set level, the cooling fan is driven at a predetermined rotation speed exceeding the set first speed limit. A second driving step; Cooling device driving method of the electronic device, characterized in that comprises a. The method of claim 5, wherein the first driving step, Detecting an internal temperature of the system according to the start of operation of the electronic device; Determining whether the detected temperature reaches a chiller driving temperature; Driving the cooling fan within the set first speed limit when the determination result reaches a cooling device driving temperature; Determining whether the system internal temperature is lower than the cooling device driving temperature after a predetermined time has elapsed since driving the cooling fan; Cooling device driving method of the electronic device, characterized in that comprises a. The method of claim 6, wherein in the determining whether the system internal temperature is equal to or lower than the chiller driving temperature The method of claim 1, further comprising stopping the driving of the cooling fan when the temperature of the cooling device is lower than the driving temperature. The method of claim 5, wherein the second driving step, Determining whether the system internal temperature is above a predetermined threshold temperature; Determining whether the detected ambient noise level exceeds a predetermined reference value by detecting the ambient noise level when the determination result is greater than or equal to a predetermined threshold temperature; Driving by increasing the rotational speed of the cooling fan at a predetermined rotational speed exceeding the set first limiting speed when the reference value is exceeded as a result of the determination; Cooling device driving method of the electronic device, characterized in that comprises a. The method of claim 8, wherein when it is determined whether the ambient noise level exceeds the set reference value, the ambient noise level does not exceed the set reference value. And driving the cooling fan at a rotation speed within the set first speed limit. According to claim 8, In the step of driving to increase the rotational speed of the cooling fan, The rotational speed of the cooling fan does not exceed the second set speed limit.

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