TW201443623A - Electronic device and fan control method thereof - Google Patents

Abstract

A fan control method suitable for an electronic device including a portable device and a docking station is provided, wherein the portable device includes a first fan and the docking station includes a second fan. The fan control method includes following steps: determining whether a sensing signal from the docking station is received so as to switch the portable device to a notebook mode or a pad mode; and, dynamically adjusting rotation speed of the first fan and the second fan according to a first noise-versus-temperature table and a inner temperature value of the portable device in the notebook mode.

Description

Electronic device and fan control method thereof

The present invention relates to an electronic device and a fan control method thereof, and more particularly to an electronic device having a portable device and a docking station and a fan control method thereof.

Portable devices (eg tablets) can be expanded with the docking station to expand their use. In addition, when the portable device is combined with the docking station, the portable device can utilize the fan in the docking station to dissipate heat, in addition to using the internal fan. However, in the prior art, the operating mechanism of the fan in the portable device and the fan in the docking station are often independent of each other. Therefore, the prior art cannot coordinate the rotational speeds of the two fans in response to the operating state of the portable device, thereby affecting the operational performance of the portable device. In addition, when the two fans operate at the same time, the two fans tend to generate a large amount of noise, which causes user discomfort.

The invention provides an electronic device and a fan control method thereof, which can set a first noise value and a second noise value according to an internal temperature value in a notebook mode. Thereby, the operational performance of the portable device can be improved, and the comfort of the user can be taken into consideration.

The fan control method of the present invention is applicable to an electronic device including a portable device and a docking station, wherein the portable device includes a first fan, the docking station includes a second fan, and the fan control method includes the following steps: determining whether Receiving an inductive signal from the docking station to switch the portable device to the notebook mode or the tablet mode; and, in the pen mode, according to the first noise temperature table and the internal temperature value of the portable device, The rotational speeds of the first fan and the second fan are dynamically adjusted.

The electronic device of the present invention includes a portable device and a docking station. The portable device includes a processor, a first controller and a first fan, and the docking station includes a second fan. The portable device determines whether the sensing signal from the docking station is received, and switches to the laptop mode or the tablet mode according to the determination result. In addition, in the notebook mode, the portable device dynamically adjusts the rotational speeds of the first fan and the second fan according to the first noise temperature comparison table and the internal temperature value.

From another point of view, the fan control method of the present invention is applicable to an electronic device including a portable device and a docking station, wherein the portable device includes a first fan, the docking station includes a second fan, and the fan controls The method includes the following steps: determining whether an inductive signal from the docking station is received to switch the portable device to the notebook mode or the tablet mode; and when the portable device is switched from the notebook mode to the tablet mode, The rotation speed of the first fan is adjusted to the maximum rated rotation of the first fan speed.

Based on the above, the present invention can simultaneously set the first noise value of the first fan and the second noise value of the second fan according to the internal temperature value of the portable device. Thereby, in the notebook mode, the rotational speeds of the two fans can be dynamically adjusted according to the operating state of the portable device, and the noise generated by the two fans can be taken into consideration while adjusting the rotational speed of the two fans.

The above described features and advantages of the invention will be apparent from the following description.

10‧‧‧Electronic devices

100‧‧‧ portable device

200‧‧‧Expansion base

201‧‧‧ Groove

110‧‧‧First fan

120‧‧‧ processor

130‧‧‧temperature sensor

140‧‧‧First controller

150‧‧‧Basic input and output system

210‧‧‧second fan

220‧‧‧second controller

S410~S490, S471~S473‧‧‧ steps in the flow chart of Figure 4

S610~S690, S671~S673‧‧‧ steps in the flowchart of Figure 6

S710~S790‧‧‧Steps in the flow chart of Figure 7

1 and 2 are schematic structural views of an electronic device according to an embodiment of the invention, respectively.

3 is a block diagram of an electronic device in a notebook mode according to an embodiment of the invention.

4 is a flow chart of a fan control method in a notebook mode according to an embodiment of the invention.

FIG. 5 is a block diagram of an electronic device in a tablet mode according to an embodiment of the invention.

6 is a flow chart of a fan control method in a tablet mode according to an embodiment of the invention.

FIG. 7 is a flow chart of a fan control method according to an embodiment of the invention.

1 and 2 are schematic structural views of an electronic device according to an embodiment of the invention, respectively. As shown in FIG. 1 , the electronic device 10 includes a portable device 100 and a docking station 200 . The portable device 100 is, for example, a tablet PC or a portable device with independent computing and display functions. The type of the portable device 100 is not limited herein. In addition, the portable device 100 is adapted to be detachably assembled to the docking station 200. For example, the docking station 200 includes a recess 201, and the portable device 100 can be inserted into the recess 201 to be electrically connected to the docking station 200. Moreover, as shown in FIG. 2 , the portable device 100 can also be detached from the expansion base 200 to be electrically separated from the expansion base 200 .

In other words, the portable device 100 can be electrically connected or electrically separated from the docking station 200. In addition, when the portable device 100 is inserted into the docking station 200, that is, when the portable device 100 is electrically connected to the docking station 200, the portable device 100 can receive the sensing signal from the docking station 200, and according to The sensing signal is switched to the NB mode. At this time, the docking station 200 will be used as an extension kit of the portable device 100 and used to expand the use function of the portable device 100.

In contrast, when the portable device 100 is detached from the docking station 200, that is, when the portable device 100 is electrically separated from the docking station 200, the portable device 100 cannot receive the sensing signal from the docking station 200. Switch to a flat mode (PAD mode). In other words, in operation, the portable device 100 determines whether the sensing signal from the docking station 200 is received, and switches to the laptop mode or the tablet mode according to the determination result. Wherein, when receiving from the docking station 200 When the signal is sensed, the portable device 100 will switch to the notebook mode. Conversely, when the inductive signal from the docking station 200 cannot be received, the portable device 100 will switch to the tablet mode.

Further, the portable device 100 includes a first fan 110, and the docking station 200 includes a second fan 210, wherein the heat dissipation capability of the first fan 110 is smaller than the heat dissipation capability of the second fan 210. In operation, when the portable device 100 is switched to the notebook mode, the portable device 100 can simultaneously utilize the first fan 110 and the second fan 210 to dissipate heat. In contrast, when the portable device 100 is switched to the tablet mode, the portable device 100 will be able to dissipate heat through the first fan 110.

3 is a block diagram of an electronic device in a notebook mode according to an embodiment of the invention, in order to enable a person skilled in the art to better understand the control of the fan in the notebook mode. 4 is a flowchart of a fan control method in a notebook mode according to an embodiment of the present invention. The operation of the electronic device 10 in the notebook mode will be further described below with reference to FIGS. 3 and 4.

As shown in FIG. 3, the portable device 100 further includes a processor 120, a temperature sensor 130, a first controller 140, and a Basic Input Output System (BIOS) 150. The processor 120 includes a central processing unit (CPU). The first controller 140 can be, for example, an embedded controller. The docking station 200 further includes a second controller 220, and the second controller 220 can also be, for example, an embedded controller. In addition, as shown in FIG. 3, when the portable device 100 is inserted into the docking station 200, the first controller 140 electrically connects the connection interface (not shown) in the permeable recess 201. The second fan 210 in the base 200 is filled with the second controller 220.

Please refer to FIG. 3 and FIG. 4 at the same time. When the portable device 100 is inserted into the docking station 200, that is, when the portable device 100 is electrically connected to the docking station 200, as shown in step S410, the portable device 100 can be based on the sensing signal from the docking station 200. Switch to the notebook mode. In addition, as shown in step S420, the temperature sensor 130 detects the temperature of the portable device 100 to generate an internal temperature value, and the temperature sensor 130 continuously updates the internal temperature value. Furthermore, as shown in step S430, the first controller 140 determines whether the internal temperature value is greater than a temperature threshold. In other words, in the notebook mode, the temperature sensor 130 can be used to detect the temperature of the portable device 100 to obtain an internal temperature value, and the first controller 140 can be further used to determine whether the internal temperature value is greater than a temperature threshold. .

When the internal temperature value is not greater than the temperature threshold, as shown in step S440, the first controller 140 determines whether it is necessary to improve the operational performance of the processor 120. In addition, when the result of the determination is that the performance of the processor 120 needs to be improved, as shown in step S450, the first controller 140 generates a control signal to improve the operational performance of the processor 120. The operating performance of the processor 120 can be, for example, the clock frequency of the processor 120, and the clock frequency of the processor 120 can be, for example, the operating frequency of the central processing unit. In addition, in an embodiment, as shown by the dotted line in FIG. 3, the control signal is transmitted to the processor 120, and the processor 120 adjusts its operational performance according to the control signal.

Moreover, in another embodiment, as shown by the solid line in FIG. 3, the control signal is transmitted to the basic input/output system 150, and the basic input/output system 150 The processor 120 is controlled based on the control signal to cause the processor 120 to adjust its operational performance. In other words, the first controller 140 can control the processor 120 through the basic input output system 150. However, in practical applications, those skilled in the art can also use an application unit to replace the basic input and output system 150 and control the processor 120 through the application unit.

When the result of the determination is that the performance of the processor 120 is not required to be improved, or after the operational performance of the processor 120 is improved, as shown in step S460, the first controller 140 will be based on the internal temperature value and a first noise temperature. The first noise value of the first fan 110 and the second noise value of the second fan 210 are set in a comparison table to adjust the rotational speeds of the first fan 110 and the second fan 210.

For example, the first controller 140 has a first noise temperature comparison table, and the first noise temperature comparison table records a plurality of preset temperature values, a plurality of first preset noise values, and a plurality of second The preset noise value is preset, and each preset temperature value corresponds to a first preset noise value and a second preset noise value. In addition, in an embodiment, as shown by the solid line in FIG. 3, the first controller 140 compares the plurality of preset temperature values according to the internal temperature value, and according to the comparison result, the plurality of first The first noise value is set by selecting one of the preset noise values, and the second noise value is set by selecting one of the plurality of second preset noise values. Moreover, the first controller 140 adjusts the rotation speed of the first fan 110 according to the first noise value, and adjusts the rotation speed of the second fan 210 by using the second noise value.

In addition, in another embodiment, as shown by the dotted line in FIG. 3, the first controller 140 and the second controller 220 respectively have a first noise temperature comparison table. the first The controller 140 sets the first noise value according to the internal temperature value and the internal first noise temperature comparison table, and adjusts the rotation speed of the first fan 110 by using the first noise value. Furthermore, the first controller 140 transmits the internal temperature value to the second controller 220. The second controller 220 sets the second noise value according to the internal temperature value and the internal first noise temperature comparison table, and adjusts the rotation speed of the second fan 210 by using the second noise value. Thereby, the first controller 140 can adjust the rotation speed of the second fan 210 through the second controller 220.

It is worth mentioning that the preset noise value in the first noise temperature comparison table is an optimized adjustment, so that the first fan 110 and the second fan 210 can have a minimum under a cooling ability. The noise, in turn, causes the portable device 100 to provide a comfortable operating environment for the user. For example, as shown in Table (1), under the same anti-heating capability, the first preset noise value and the second preset noise value have different combinations, and the different combinations can be calculated through an arithmetic expression. A total noise value for each combination. Wherein, the arithmetic expression can be, for example, And N _Z is the total noise value, N _X is the first preset noise value, and N _Y is the second preset noise value.

According to the table (1), in the case of the anti-heating capacity of 5 W, a plurality of total noise values can be calculated according to various combinations of preset noise values. Wherein, in various combinations, the first preset noise value and the second preset noise value are both less than a noise threshold (eg, 38 dB). In addition, as shown in Table (1), when the first preset noise value is 25 dB and the second preset noise value is 28 dB, the minimum total noise value at the heat-dissipating capability of 5 W can be obtained (for example, 29.76 dB). . Therefore, in the first noise temperature comparison table, when the preset temperature value is 40 ° C, the corresponding first preset noise value will be set to 25 dB, and the corresponding second preset noise value is set to 28dB.

After the rotation speeds of the two fans are adjusted, as shown in step S480, the first controller 140 determines whether the portable device 100 is maintained in the notebook mode. If the portable device 100 is continuously maintained in the notebook mode, it will return to step S420 to continuously use the temperature sensor 130 to detect the temperature of the portable device 100 and continuously update the internal temperature value. . On the other hand, if the portable device 100 is electrically separated from the docking station 200, the first controller 140 will execute step S490 to end the notebook mode.

In practical applications, the user may continuously turn on the application function in the portable device 100, thereby causing the temperature of the portable device 100 to continuously rise. At this time, the temperature sensor 130 continuously increases the internal temperature value according to the detection result. In addition, during the period in which the internal temperature value continues to rise to the temperature threshold, as shown in steps S450 and S460, the portable device 100 will timely improve the operational performance of the processor 120, and simultaneously adjust the first fan 110 and the first The rotational speed of the two fans 210.

On the other hand, when the internal temperature value is greater than the temperature threshold, as shown in step S470, the first controller 140 compares the noise threshold with the first noise value and the second The noise value is used to reduce the operating efficiency of the processor 120 or to increase the rotational speeds of the first fan 110 and the second fan 210 with reference to the first noise temperature comparison table. As seen in the detailed flow of step S470, as shown in step S471, the first controller 140 determines whether the first noise value and the second noise value are greater than the noise threshold.

When the first noise value and the second noise value are greater than the noise threshold, the first controller 140 generates a limit signal to reduce the operating efficiency of the processor 120, as shown in step S473. For example, in an embodiment, as shown by the dashed line in FIG. 3, the limit signal is transmitted to the processor 120, and the processor 120 reduces its operational efficiency according to the limit signal. Furthermore, in another embodiment, as shown by the solid line in FIG. 3, the limit signal is transmitted to the basic input/output system 150, and the basic input/output system 150 controls the processor 120 according to the limit signal. So that the processor 120 reduces its operational efficiency.

When the first noise value and the second noise value are not greater than the noise threshold, as shown in step S472, the first controller 140 increases the first noise value and the second noise value with reference to the first noise temperature comparison table to increase the number. The speed of a fan and the second fan. In addition, after the speed of the two fans is increased, or after the performance of the processor 120 is reduced, as shown in step S480, the first controller 140 determines whether the portable device 100 is maintained in the notebook mode, and The process returns to step S420 or step S490 according to the discrimination result.

In other words, in the notebook mode, when the temperature of the portable device 100 exceeds the temperature threshold, as shown in steps S472 and S473, the portable device 100 increases the rotational speed of the first fan 110 and the second fan 210 or Reduce the operation of the processor 120 Efforts are made to thereby cause the temperature of the portable device 100 to be lowered.

In order to enable those skilled in the art to better understand the control of the fan in the tablet mode of the portable device 100, FIG. 5 is a block diagram of the electronic device in the tablet mode according to an embodiment of the invention, FIG. According to a flowchart of a fan control method in a tablet mode according to an embodiment of the present invention, the operation of the electronic device 10 in the tablet mode will be further described below with reference to FIGS. 5 and 6.

Please refer to FIG. 5 and FIG. 6 at the same time. When the portable device 100 is detached from the docking station 200, the portable device 100 and the docking station 200 are electrically separated. At this time, as shown in step S610, the portable device 100 will not be able to receive the sensing signal from the docking station 200, and then switch to the tablet mode. In addition, as shown in step S620, the temperature sensor 130 detects the temperature of the portable device 100 to generate an internal temperature value, and the temperature sensor 130 continuously updates the internal temperature value. Furthermore, as shown in step S630, the first controller 140 determines whether the internal temperature value is greater than a temperature threshold.

When the internal temperature value is not greater than the temperature threshold, as shown in step S640, the first controller 140 determines whether it is necessary to improve the operational performance of the processor 120. In addition, when the result of the determination is that the performance of the processor 120 needs to be improved, as shown in steps S650 and S660, the first controller 140 first generates a control signal to adjust the operational performance of the processor 120, and then the first controller 140. The first noise value of the first fan 110 is set according to the internal temperature value and a second noise temperature comparison table to adjust the rotational speed of the first fan 110. In addition, when the result of the determination is that the performance of the processor 120 is not required to be improved, the first controller 140 will also perform step S660 to set the first noise value according to the internal temperature value and the second noise temperature comparison table, and accordingly Adjust the first wind The speed of the fan 110.

For example, the first controller 140 has a second noise temperature comparison table, and the second noise temperature comparison table records a plurality of preset temperature values and a plurality of preset noise values, and each preset temperature The value corresponds to a preset noise value. In operation, the first controller 140 compares the plurality of preset temperature values according to the internal temperature value, and selects the first noise value according to the comparison result. In addition, the first controller 140 adjusts the rotational speed of the first fan 110 according to the first noise value.

In addition, after the rotation speed of the first fan 110 is adjusted, as shown in step S680, the first controller 140 determines whether the portable device 100 is maintained in the tablet mode. If the portable device 100 is continuously maintained in the tablet mode, it will return to step S620 to continuously use the temperature sensor 130 to detect the temperature of the portable device 100 and continuously update the internal temperature value. On the other hand, if the portable device 100 is electrically connected to the docking station 200, the first controller 140 will execute step S690 to end the tablet mode.

Therefore, in the tablet mode, during the period in which the temperature of the portable device 100 continues to rise to the temperature threshold, as shown in steps S650 and S660, the portable device 100 will timely improve the operating efficiency of the processor 120. And adjusting the rotational speed of the first fan 110.

On the other hand, when the internal temperature value is greater than the temperature threshold, as shown in step S670, the first controller 140 compares the first threshold value with the noise threshold to reduce the operating efficiency of the processor 120 or refer to the second Noise temperature comparison table increases first The rotational speed of the fan 110. As seen in the detailed flow of step S670, as shown in step S671, the first controller 140 determines whether the first noise value is greater than the noise threshold.

When the first noise value is greater than the noise threshold, as shown in step S673, the first controller 140 generates a limit signal to reduce the operational efficiency of the processor 120. On the other hand, when the first noise value is not greater than the noise threshold, as shown in step S672, the first controller 140 will increase the first noise value with reference to the second noise temperature comparison table to increase the rotational speed of the first fan. In addition, after the speed of the first fan is increased, or after the performance of the processor 120 is reduced, the first controller 140 determines whether the portable device 100 is maintained in the tablet mode, as shown in step S680. The process returns to step S620 or step S690 based on the discrimination result.

In other words, in the tablet mode, when the temperature of the portable device 100 exceeds the temperature threshold, as shown in steps S672 and S673, the portable device 100 will increase the rotational speed of the first fan 110 or reduce the operation of the processor 120. The efficiency is such that the temperature of the portable device 100 is lowered.

It is worth mentioning that FIG. 6 is mainly used to explain the related operations of the electronic device 10 in the tablet mode. However, in the initial stage of switching from the notebook mode to the tablet mode, the electronic device 10 can also initially set the two fans in response to the change of the mode. For example, FIG. 7 is a flow chart of a fan control method according to an embodiment of the invention. As shown in step S710 of FIG. 7, in an embodiment, the portable device 100 is initially in the notebook mode.

As shown in step S720, the portable device 100 determines whether an inductive signal from the docking station 200 is received. Wherein, if the portable device 100 cannot be connected Upon receiving the sensing signal from the docking station 200, as shown in step S730, the portable device 100 will switch from the notebook mode to the tablet mode. In addition, as shown in step S740, the portable device 100 adjusts the rotational speed of the first fan 110 to the maximum rated rotational speed of the first fan 110 to thereby approach the heat dissipation requirement of the portable device 100. Similarly, as shown in step S750, the rotational speed of the second fan 210 will be adjusted to the maximum rated rotational speed of the second fan 210 until the temperature of the docking station 200 drops to a predetermined allowable range.

In addition, as shown in step S760, the portable device 100 at this time can display a mode switching message, for example, “the device has been safely detached from the docking station”, thereby allowing the user to understand the operating state of the portable device 100. It should be noted that this embodiment does not limit the order of execution of steps S730-S760. In addition, after the portable device 100 displays the mode switching message, as shown in step S770, the portable device 100 dynamically adjusts the rotational speed of the first fan 110 according to the second noise temperature comparison table and an internal temperature value. The detailed process of step S770 of FIG. 7 may include, for example, steps S620 to S670 in FIG. 6 , and thus is not described herein.

On the other hand, if the portable device 100 receives the sensing signal from the docking station 200, the portable device 100 will remain in the notebook mode as shown in step S780. Furthermore, as shown in step S790, the portable device 100 at this time dynamically adjusts the rotational speeds of the first fan 110 and the second fan 210 according to the first noise temperature comparison table and the internal temperature value. The detailed process of step S790 of FIG. 7 may include, for example, steps S420 to S470 in FIG. 4, and thus is not described herein.

In summary, when the portable device is switched to the notebook mode, the present invention can The first noise value of the first fan and the second noise value of the second fan are simultaneously set according to an internal temperature value of the portable device. Therefore, the present invention can dynamically adjust the rotational speeds of the two fans according to the operating state of the portable device, and can adjust the rotational speed of the two fans while taking into account the noise generated by the two fans. In this way, the operational performance of the portable device can be improved, and the user's comfort is taken into consideration.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

10‧‧‧Electronic devices

100‧‧‧ portable device

200‧‧‧Expansion base

201‧‧‧ Groove

110‧‧‧First fan

120‧‧‧ processor

130‧‧‧temperature sensor

140‧‧‧First controller

150‧‧‧Basic input and output system

210‧‧‧second fan

220‧‧‧second controller

Claims (30)

A fan control method is applicable to an electronic device including a portable device and a docking station, wherein the portable device includes a first fan, the docking station includes a second fan, and the fan control method includes: determining Receiving an inductive signal from the docking station to switch the portable device to an electric mode or a tablet mode; and in the cap mode, according to a first noise temperature comparison table and the portability An internal temperature value of the device dynamically adjusts the rotational speed of the first fan and the second fan. The fan control method of claim 1, further comprising: detecting, by the temperature sensor, a temperature of the portable device in the pen mode and the tablet mode to obtain the internal temperature value . The fan control method of claim 1, wherein in the notebook mode, the first fan is dynamically adjusted according to the first noise temperature comparison table and the internal temperature value of the portable device. The step of rotating the second fan includes: setting the first fan according to the internal temperature value and the first noise temperature comparison table when the internal temperature value of the portable device is not greater than a temperature threshold a first noise value and a second noise value of the second fan to adjust a rotation speed of the first fan and the second fan; and when the internal temperature value is greater than the temperature threshold, using a noise threshold comparison The first noise value and the second noise value are used to reduce the operating efficiency of a processor in the portable device or to increase the rotational speed of the first fan and the second fan by referring to the first noise temperature comparison table. The fan control method of claim 3, wherein the noise threshold is used to compare the first noise value with the second noise value to reduce the performance of the processor in the portable device or The step of increasing the rotation speed of the first fan and the second fan by referring to the first noise temperature comparison table includes: determining whether the first noise value and the second noise value are greater than the noise threshold; when the first noise value is When the second noise value is greater than the noise threshold, reducing the operating efficiency of the processor; and when the first noise value and the second noise value are not greater than the noise threshold, refer to the first noise temperature comparison table The first noise value and the second noise value increase the rotational speed of the first fan and the second fan. The fan control method of claim 3, further comprising: upgrading the processor before setting the first noise value and the second noise value according to the internal temperature value and the first noise temperature comparison table. Operational effectiveness. The fan control method of claim 1, further comprising: dynamically adjusting the rotation speed of the first fan according to a second noise temperature comparison table and the internal temperature value in the tablet mode. The fan control method according to claim 6, wherein in the tablet mode, the step of dynamically adjusting the rotation speed of the first fan according to the second noise temperature comparison table and the internal temperature value comprises: when When the internal temperature value is not greater than the temperature threshold, the first noise value is set according to the internal temperature value and the second noise temperature comparison table to adjust the rotation speed of the first fan; When the internal temperature value is greater than the temperature threshold, the noise threshold is used to compare the first noise value to reduce the operating efficiency of a processor in the portable device or increase the reference to the second noise temperature table. The rotational speed of the first fan. The fan control method of claim 7, wherein the noise threshold is used to compare the first noise value to reduce the operating efficiency of the processor in the portable device or refer to the second noise temperature. The step of increasing the rotation speed of the first fan by the comparison table includes: determining whether the first noise value is greater than the noise threshold; and when the first noise value is greater than the noise threshold, reducing the operating efficiency of the processor; When the first noise value is not greater than the noise threshold, the first noise value is increased by referring to the second noise temperature comparison table to increase the rotation speed of the first fan. The fan control method of claim 7, further comprising: improving the operating efficiency of the processor before setting the first noise value according to the internal temperature value and the second noise temperature comparison table. The fan control method of claim 1, wherein the heat dissipation capability of the first fan is smaller than the heat dissipation capability of the second fan. The fan control method of claim 1, wherein the step of determining whether the sensing signal from the docking station is received to switch the portable device to the pen power mode or the tablet mode comprises: Switching the portable device to the laptop mode when receiving the sensing signal from the docking station; When the sensing signal from the docking station cannot be received, the portable device is switched to the tablet mode. An electronic device includes: a portable device, including a processor, a first controller and a first fan; and a docking station, including a second fan, wherein the portable device determines whether the slave device receives An inductive signal of the docking station is switched to an electric mode or a tablet mode according to the discriminating result, and in the cap mode, the portable device is based on a first noise temperature comparison table and an internal temperature value. The rotational speeds of the first fan and the second fan are dynamically adjusted. The electronic device of claim 12, wherein the portable device further comprises: a temperature sensor, detecting a temperature of the portable device to generate the internal temperature value, and the temperature sensor This internal temperature value is continually updated. The electronic device of claim 12, wherein, in the notebook mode, when the internal temperature value of the portable device is not greater than a temperature threshold, the first controller is based on the internal temperature value And setting a first noise value of the first fan and a second noise value of the second fan to adjust a rotation speed of the first fan and the second fan, and the pen In the electrical mode, when the internal temperature value is greater than the temperature threshold, the first controller uses a noise threshold to compare the first noise value with the second noise value to reduce the operating efficiency of the processor or Adding the first fan and the second wind with reference to the first noise temperature comparison table The speed of the fan. The electronic device of claim 14, wherein in the notebook mode, the first controller further determines whether the first noise value and the second noise value are greater than the noise threshold, wherein the first When the noise value and the second noise value are greater than the noise threshold, the first controller generates a limit signal to reduce the operating performance of the processor, when the first noise value and the second noise value are not greater than the The first controller adds the first noise value and the second noise value to the first noise temperature comparison table to increase the rotation speed of the first fan and the second fan. The electronic device of claim 14, wherein the first controller generates a control signal to improve the operational performance of the processor before setting the first noise value and the second noise value. The electronic device of claim 12, wherein the docking station further comprises a second controller, and the first controller transmits the internal temperature value to the second controller to transmit the second control The speed of the second fan is adjusted. The electronic device of claim 12, wherein in the tablet mode, the first controller dynamically adjusts the rotational speed of the first fan according to a second noise temperature comparison table and the internal temperature value. The electronic device of claim 18, wherein in the tablet mode, when the internal temperature value is not greater than the temperature threshold, the first controller compares the internal temperature value with the second noise temperature. Setting the first noise value to adjust the rotation speed of the first fan, and in the tablet mode, when the internal temperature value is greater than the temperature threshold, the first controller uses the noise threshold to compare The first noise value is used to reduce the operating efficiency of the processor or to increase the rotational speed of the first fan by referring to the second noise temperature comparison table. The electronic device of claim 18, wherein the first controller further determines whether the first noise value is greater than the noise threshold, and when the first noise value is greater than the noise threshold, the first control The controller generates a limit signal to reduce the operating performance of the processor. When the first noise value is not greater than the noise threshold, the first controller increases the first noise value by referring to the second noise temperature comparison table to Increase the rotational speed of the first fan. The electronic device of claim 18, wherein the first controller generates a control signal to increase the first noise value according to the internal temperature value and the second noise temperature comparison table. The operating efficiency of the processor. The electronic device of claim 12, wherein the heat dissipation capability of the first fan is less than the heat dissipation capability of the second fan. The electronic device of claim 12, wherein when the portable device is inserted into the docking station, the portable device receives the sensing signal from the docking station and switches to the battery mode. When the portable device is detached from the docking station, the portable device cannot receive the sensing signal and switch to the tablet mode. A fan control method is applicable to an electronic device including a portable device and a docking station, wherein the portable device includes a first fan, the docking station includes a second fan, and the fan control method includes: determining Whether an inductive signal from the docking station is received to carry the portability The device switches to an electric mode or a tablet mode; and when the portable device is switched from the pen mode to the tablet mode, the rotation speed of the first fan is adjusted to the maximum rated speed of the first fan. The fan control method of claim 24, further comprising: dynamically adjusting the first temperature value according to a first noise temperature comparison table and an internal temperature value of the portable device in the notebook mode The speed of the fan and the second fan. The fan control method of claim 24, further comprising: displaying a mode switching message through the portable device when the portable device is switched from the pen mode to the tablet mode; After the portable device displays the mode switching message, the rotational speed of the first fan is dynamically adjusted according to a second noise temperature comparison table and an internal temperature value of the portable device. The fan control method of claim 26, wherein the step of dynamically adjusting the rotational speed of the first fan according to the second noise temperature comparison table and the internal temperature value of the portable device comprises: when When the internal temperature value is not greater than a temperature threshold, a first noise value of the first fan is set according to the internal temperature value and the second noise temperature comparison table to adjust the rotation speed of the first fan; and when the internal When the temperature value is greater than the temperature threshold, the noise threshold is used to compare the first noise value to reduce the operating efficiency of a processor in the portable device or to increase the first reference to the second noise temperature comparison table. The speed of the fan. The fan control method as described in claim 24, further comprising: When the portable device is switched from the battery mode to the tablet mode, the rotation speed of the second fan is adjusted to the maximum rated speed of the second fan until the temperature of the docking station drops to a predetermined allowable range. The fan control method of claim 24, wherein the heat dissipation capability of the first fan is smaller than the heat dissipation capability of the second fan. The fan control method of claim 24, wherein the step of determining whether the sensing signal from the docking station is received to switch the portable device to the pen power mode or the tablet mode comprises: Switching the portable device to the charging mode when receiving the sensing signal from the docking station; and switching the portable device to the receiving device when the sensing signal from the docking station cannot be received Tablet mode.