TWI494052B - Method for controlling fan speed and electronic device - Google Patents

Description

Fan speed control method and electronic device

The present invention relates to a fan control technology, and more particularly to a fan speed control method and an electronic device.

At present, computer devices are generally equipped with heat sinks (such as heat sinks, fans, etc.), and among these heat sinks, fans are one of the indispensable parts. Because the fan can effectively exclude the heat source generated by the internal components and/or the device of the computer device from being outside the casing of the computer device, the various components and/or devices in the computer device can operate normally. In view of the commonly used proportional-integral-differential (PID) control fan, the fan width can be controlled according to a pulse width modulation signal (PWM signal). For example, by changing the duty cycle of the pulse width modulation signal, the fan speed (in units per minute/RPM) can be controlled.

However, for a computer device with a large temperature variation, how to balance the energy saving and heat dissipation efficiency is one of the subjects that the technicians in the field need to study.

In view of this, the present invention provides a fan speed control method and an electronic device, which can effectively reduce the risk of damage to an electronic device due to a sudden increase in temperature.

The invention provides a fan speed control method, which is suitable for an electronic device having at least one fan, and the at least one fan controls the fan speed according to a servo signal of the at least one fan. The fan speed control method includes the following steps. The slave control signal of the at least one fan is fed back to the control module of the electronic device. Obtaining a temperature threshold corresponding to an electronic component of the electronic device according to the slave control signal of the at least one fan. Sensing the temperature of the electronic components. Determine if the temperature of the electronic component is less than the temperature threshold. When the temperature of the electronic component is less than the temperature threshold, the preset master signal is generated according to the at least one fan control signal, and the preset master signal is used as the master signal of the electronic component. Generating a control signal of the at least one fan according to a master signal of the electronic component. Controlling, according to the at least one fan control signal, the fan speed of the at least one fan.

In an embodiment of the invention, the fan speed control method further comprises the following steps. Generating a control signal of the at least one fan according to a weight value corresponding to the electronic component and the at least one fan respectively.

In an embodiment of the invention, the step of generating a preset master signal according to the at least one fan control signal includes the following steps. And generating a preset master signal according to the slave control signal of the at least one fan and the weight value of the at least one fan corresponding to the electronic component.

In an embodiment of the present invention, the slave control signal according to the at least one fan and the at least one fan respectively correspond to the weight of the electronic component The value, the step of generating the preset master signal includes the following steps. The servo signal of the at least one fan is divided by the weight value of the at least one fan corresponding to the electronic component to generate at least one candidate signal. The candidate signal having the smallest value among the at least one candidate signal is used as the preset master signal.

In an embodiment of the invention, the fan speed control method further comprises the following steps. When the temperature of the electronic component is not less than the temperature threshold, the master signal of the electronic component is generated according to the temperature of the electronic component.

The invention further provides an electronic device comprising at least one fan, at least one electronic component, a temperature sensor and a control module. The at least one fan is configured to control a fan speed according to the at least one fan control signal, and feed back the at least one fan control signal to a control module of the electronic device. The temperature sensor is coupled to the at least one electronic component for sensing a temperature of the first one of the at least one electronic component. The control module is coupled to the temperature sensing module and the at least one fan, configured to acquire a temperature threshold corresponding to the first electronic component according to the servo signal of the at least one fan, and determine the first electronic component Whether the temperature is less than the temperature threshold. When the temperature of the first electronic component is less than the temperature threshold, the control module generates a preset main control signal according to the at least one fan control signal, and uses the preset main control signal as the main control signal of the first electronic component. The control module generates a slave control signal of the at least one fan according to the master control signal of the first electronic component, and controls a fan speed of the at least one fan according to the slave control signal of the at least one fan.

In an embodiment of the present invention, the control module generates a slave control signal of the at least one fan according to a weight value corresponding to the first electronic component and the at least one fan respectively.

In an embodiment of the present invention, the control module generates a preset master signal according to the slave control signal of the at least one fan and the weight value of the at least one fan corresponding to the first electronic component.

In an embodiment of the present invention, the control module divides the at least one fan control signal by the weight value of the at least one fan corresponding to the first electronic component to generate at least one candidate signal. And selecting, as the preset master signal, the candidate signal with the smallest value among the at least one candidate signal.

In an embodiment of the invention, when the temperature of the first electronic component is not less than the temperature threshold, the control module generates a master signal of the first electronic component according to the temperature of the first electronic component.

Based on the above, the present invention can feed back the servo control signal of the fan to the control module of the electronic device to acquire a temperature threshold corresponding to an electronic component of the electronic device according to the servo signal of the fan. Then, after determining that the temperature of the electronic component in the electronic device is less than the temperature threshold, the preset master signal is generated according to the servo signal of the fan, and the preset master signal is used as the master signal of the electronic component. Then, according to the main control signal of the electronic component, the fan control signal is generated to control the fan speed of the fan according to the servo signal of the fan. In this way, when the fan speed needs to be immediately increased, the fan speed can be directly increased to a higher level based on the current speed of the fan.

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

Generally, an electronic device (for example, a computer device) with a large amount of computation generally has more than one electronic component with a high heat generation, and must be dissipated by a fan. At present, the more common fan control technology is, for example, a proportional-integral-differential (PID) control fan technology. Briefly, the PID control fan technology can control the fan speed of each fan according to a pulse width modulation signal (PWM signal) corresponding to one or more electronic components.

In addition, in order to effectively reduce the noise generated by the fan operation and save the power required for the fan operation, generally, when the temperature of an electronic component in the computer device is low (for example, below a critical temperature), Usually, the computer device will adjust the pulse width modulation signal corresponding to the electronic component to the minimum PWM signal, without controlling the fan, and handing the fan speed to other high temperature. Parts or devices to control.

However, for parts or devices with more severe temperature changes, the above operational mechanism is not appropriate. For example, assume that the temperature of a display card in a computer device is significantly higher than the temperature of a central processing unit (CPU) in the computer device at a certain time. At this time, the display card's requirement for the fan speed is higher than the CPU's requirement for the fan speed, thereby increasing the fan speed. However, the increased fan speed may cause the temperature of the central processor, which is not too high, to drop more rapidly, so that its corresponding pulse width modulation signal is reduced to the minimum pulse. Wide tone signal. Then, assuming that the CPU suddenly rises in temperature due to sudden high-speed operation, the corresponding pulse width modulation signal must be raised from the minimum pulse width modulation signal to the pulse width modulation signal corresponding to the current fan speed. In order to control the fan to increase its current speed, to quickly reduce the temperature of the central processor.

However, in the process of raising the pulse width modulation signal from the minimum pulse width modulation signal to the pulse width modulation signal corresponding to the current fan rotation speed, it may take too long time to cause parts or devices in the computer device. (for example, the above central processor) has been damaged due to its excessive temperature.

Therefore, in order to make the fan speed can be adjusted quickly and adaptively according to the temperature change of the electronic component, the embodiment of the present invention provides a fan speed control method, which can feedback the servo signal of the fan. And a control module for the electronic device to acquire a temperature threshold corresponding to an electronic component of the electronic device according to the servo signal of the fan. Then, when the temperature of the electronic component is less than the temperature threshold, the present invention can generate a preset master signal according to the servo signal fed back by the fan, and preset the master signal as the master signal of the electronic component. Therefore, when the temperature of the electronic component suddenly increases sharply, the main control signal of the electronic component can be quickly upgraded from the preset main control signal to an appropriate intensity to increase the current fan speed to a higher speed in a short time. . Thereby, the present invention can effectively reduce the risk of damage to the electronic device due to sudden changes in temperature.

In addition, embodiments of the present invention further disclose an electronic device that can be used to implement the above-described fan speed control method. In order to make the content of the present invention easier to understand, the following specific embodiments are illustrative of the embodiments of the present invention.

FIG. 1 is a functional block diagram of an electronic device according to an embodiment of the invention. Referring to FIG. 1 , in the embodiment, the electronic device 10 can be a notebook computer, a tablet computer, a desktop computer, an industrial computer, or a server host. Device.

In the embodiment, the electronic device 10 includes an electronic component 11-1, an electronic component 11-2, fans 12-1~12-5, a temperature sensor 13, and a control module 14. The electronic component 11-1 and the electronic component 11-2 may include various types of chips such as a central processing unit (CPU), a power supply, a display card, and a network card. The electronic components such as various components or devices commonly found in interface cards and various computer devices are not limited by the present invention.

In this embodiment, the fans 12-1~12-5 are, for example, proportional proportional derivative control fans, which can control the fan speed according to the pulse width modulation signal. For example, the fans 12-1~12-5 each have a control chip, and the fan speed can be controlled according to the respective servo signals. It is worth mentioning that the electronic component 11-1 and the electronic component 11-2 and the fans 12-1~12-5 shown in FIG. 1 are used as the description in the embodiment, and the actual number thereof is substantially visual practice. Increasing or decreasing the design requirements, the invention is not limited thereto.

The temperature sensor 13 is coupled to the electronic component 11-1 and the electronic component 11-2 for sensing the temperature of the electronic component 11-1 and the electronic component 11-2. In this embodiment, temperature sensor 13 may include one or more general temperature sensors and/or temperature sensing wafers. In addition, the temperature sensor 13 can also be disposed on the electronic component 11-1 and the electronic component 11-2, or can be coupled to the electronic component 11-1 and the electronic component 11-2 only in a coupled manner. The temperature of the electronic component 11-1 and the electronic component 11-2 is sensed, and the present invention is also not limited thereto.

The control module 14 is coupled to the temperature sensing module 13 and the fans 12-1~12-5 for sensing the temperature of the electronic component 11-1 and the electronic component 11-2 according to the temperature sensing module 13. To control the fan speed of the fans 12-1~12-5. Specifically, the electronic component 11-1 is taken as an example. The control module 14 can generate a main control signal corresponding to the electronic component 11-1 according to the temperature of the electronic component 11-1. Then, the control module 14 generates a plurality of servo signals corresponding to the fans 12-1~12-5 according to the main control signals corresponding to the electronic components 11-1, wherein each of the slave signals corresponds to the fan 12-1~ One of 12-5. Thereby, the fans 12-1~12-5 can adjust the respective fan speeds according to their respective servo signals. In particular, in the present embodiment, the fans 12-1~12-5 can also feed back the respective servo signals to the control module 14.

It should be noted that the main control signal and the servant signal mentioned in the embodiments of the present invention are mainly used to distinguish the electronic component 11-1 from the electronic component 11-2 and the fans 12-1~12-5. Speed control signal. In addition, Both the master signal and the servo signal mentioned in the embodiments of the present invention can be regarded as a fan speed control signal in the form of a PWM value.

In particular, when the electronic component 11-1 and the electronic component 11-2 operate simultaneously, the control module 14 can generate the electronic component 11-1 and the electronic component 11 according to the temperatures of the electronic component 11-1 and the electronic component 11-2, respectively. The main control signal of 2, and simultaneously generate the servo signals of the fans 12-1~12-5 according to the main control signals of the electronic component 11-1 and the electronic component 11-2, to control the fans 12-1~12-5 speed of the fan. For example, in this embodiment, the control module 14 can respectively correspond to the electronic component 11 according to the respective main control signals of the electronic component 11-1 and the electronic component 11-2 and the fans 12-1~12-5. 1 and the weight value of the electronic component 11-2 to generate the servo signals of the fans 12-1~12-5. For convenience of explanation, in the present embodiment, it is assumed that the weight values of the electronic component 11-1 corresponding to the fans 12-1 to 12-5 are 80%, 100%, 100%, 80%, and 100%, respectively, and the electronic component 11 The weight values of -2 corresponding to the fans 12-1 to 12-5 are 100%, 100%, 100%, 80%, and 0, respectively. In particular, the weight value of the electronic component 11-2 for the fan 12-5 is 0, indicating that the electronic component 11-2 has no control for the fan 12-5. In addition, the temperatures of the electronic component 11-1 and the electronic component 11-2 are represented by T1 and T2, respectively.

In this embodiment, the control module 14 can generate the main control signal PWM1 of the electronic component 11-1 and the main component of the electronic component 11-2 according to the temperature T1 of the electronic component 11-1 and the temperature T2 of the electronic component 11-2. Control signal PWM2. Then, in order to generate the servo signal of the fan 12-1, the control module 14 multiplies the main control signal PWM1 of the electronic component 11-1 by the electronic component 11-1. Corresponding to the weight value (for example, 80%) of the fan 12-1, and multiplying the main control signal PWM2 of the electronic component 11-2 by the weight value (for example, 100%) of the electronic component 11-2 corresponding to the fan 12-1. The larger the result of the multiplication is used as the servo signal of the fan 12-1. For example, if the value of PWM1×80% is greater than the value of PWM2×100%, the control module 14 uses the value of PWM1×80% as the servo signal of the fan 12-1.

For another example, in order to generate the servo signal of the fan 12-2, the control module 14 multiplies the main control signal PWM1 of the electronic component 11-1 by the weight value of the electronic component 11-1 corresponding to the fan 12-2 (for example, 100%). And multiplying the main control signal PWM2 of the electronic component 11-2 by the weight value (for example, 100%) of the electronic component 11-2 corresponding to the fan 12-2, so that the result of the multiplication is greater as the fan 12. -2 servant signal. For example, if the value of PWM2×100% is greater than the value of PWM1×100%, the control module 14 uses the value of PWM2×100% as the servo signal of the fan 12-2. The manner of generating the servant signals of the remaining fans 12-3~12-5 can be obtained by analogy with the above-mentioned methods, and will not be described here. In addition, in other embodiments, the weight value may also be expressed in a parameter or any other form, which is not limited herein. For example, the above weight value may be 100% for 3 and/or 80% for 2 or the like.

In this embodiment, the control module 14 can be a micro-controller, an embedded controller, or a central processing unit (CPU), and can be independently disposed on the electronic device 10 . Or in the electronic component 11-1 and the electronic component 11-2, but the embodiments of the present invention are not limited to Said. For example, in another embodiment, the control module 14 can also be a firmware or software module stored in a hard disk or a memory of the electronic device 10, and can be loaded into the processor of the electronic device 10, and Perform the above functions.

FIG. 2 is a schematic flow chart of a method for controlling a fan speed according to an embodiment of the invention. The electronic device 10 and the fan speed control method of the present embodiment will be described in detail below with reference to FIG. Referring to FIG. 1 and FIG. 2, first, in step S202, the fans 12-1~12-5 feed back their respective servo signals to the control module 14. Then, in step S208, the control module 14 can calculate and acquire the temperature threshold values corresponding to the electronic component 11-1 and the electronic component 11-2 according to the servo signals fed back by the fans 12-1~12-5. . In addition, the control module 14 may also specify temperature threshold values corresponding to the electronic component 11-1 and the electronic component 11-2, for example, by looking up a table, etc., which is not limited by the present invention.

In this embodiment, the temperature threshold is, for example, any temperature between 30 degrees and 45 degrees, and the actual temperature threshold may also be determined by the heat resistance of the electronic component 11-1 and the electronic component 11-2. Turn up or down. For example, assuming that the degree of heat resistance of the electronic component 11-1 is high, the temperature threshold corresponding to the electronic component 11-1 can be slightly increased. For another example, assuming that the degree of heat resistance of the electronic component 11-2 is low, the temperature threshold corresponding to the electronic component 11-2 can be slightly lowered.

Then, in step S206, the temperature sensor 13 senses the temperature of the electronic component 11-1 and the electronic component 11-2, and transmits the sensed temperature of the electronic component 11-1 and the electronic component 11-2 to the control. Module 14. Next, proceeding to step S206, in step S208, the control module 14 determines the electronic component Whether the temperature of 11-1 and the electronic component 11-2 is smaller than a temperature threshold corresponding to each of the electronic component 11-1 and the electronic component 11-2.

If the control module 14 determines that the temperature of the electronic component 11-1 and the electronic component 11-2 is not less than (eg, equal to or greater than) the temperature threshold, then step S210 is followed by step S210, and the control module 14 is configured according to the electronic The temperature of the component 11-1 and the electronic component 11-2 generates respective master signals of the electronic component 11-1 and the electronic component 11-2.

On the other hand, when the control module 14 determines that the temperature of the one or more electronic components of the electronic component 11-1 and the electronic component 11-2 is less than the temperature threshold, the control module 14 may be configured according to the fan 12 in step S212. The slave control signal of -1~12-5 generates a preset master signal and uses the preset master signal as the master signal of the electronic component whose temperature is lower than the temperature threshold. For example, the electronic component 11-1 is taken as an example. If the control module 14 determines that the temperature of the electronic component 11-1 is less than a temperature threshold (for example, 30 degrees), the control module 14 can be based on the fan 12-1. The slave control signal feedback from ~12-5 is used to generate the preset master signal. In addition, the control module 14 can also directly use the servo signal of one of the fans 12-1~12-5 as the preset master signal. Alternatively, the control module 14 may also use the average servo signal of the fans 12-1~12-5 as the preset master signal, which is not limited by the present invention.

In particular, assuming that the fans 12-1~12-5 respectively have weight values corresponding to the electronic components 11-1, the control module 14 can also be based on the servo signals of the fans 12-1~12-5 and the fan 12-1. ~12-5 each corresponding to the weight value of the electronic component 11-1, generating the preset master signal. For example, in this embodiment, it is assumed that the control module 14 first electrically connects the electronic component 11-1. The sub-components 11-2, the respective main control signals PWM1 and PWM2 multiplied by the fans 12-1~12-5 respectively correspond to the weight values of the electronic component 11-1 and the electronic component 11-2, and then are larger according to the multiplication result. The respective servo signals are used as the fans 12-1 to 12-5 (please refer to the description of the embodiment of Fig. 1). Therefore, in step S212, when the temperature of the electronic component 11-1 is less than the temperature threshold, the control module 14 can divide the servo signals of the fans 12-1~12-5 by the fans 12-1~12- 5 each corresponds to a weight value of the electronic component 11-1 to generate one or more candidate signals. Then, the control module 14 can select the candidate signal with the smallest value from the one or more candidate signals as the preset master signal. For example, assume that the weight values of the fans 12-1~12-5 corresponding to the electronic component 11-1 are 80%, 100%, 100%, 80%, and 100%, respectively, and the current servants of the fans 12-1~12-5 The control signals are respectively PWMS1~PWMS5, and the control module 14 can use PWMS1×80%, PWMS2×100%, PWMS3×100%, PWMS4×80%, and PWMS5×100% as candidate signals. Then, assuming that PWMS4×80% is the one with the smallest value, the control module 14 can use PWMS4×80% as the preset master signal.

Next, in step S214, the control module 14 can generate the servo signals of the fans 12-1~12-5 according to the main control signals of the electronic component 11-1 and the electronic component 11-2. For details of how to generate the servant signal, refer to the description of the foregoing embodiment, and details are not described herein again. Then, in step S216, the control module 14 controls the fan speeds of the fans 12-1~12-5 according to the servo signals of the fans 12-1~12-5.

For the implementation details in the above method, sufficient teachings, suggestions and implementation descriptions can be obtained from the above embodiments, and details are not described herein again.

In other words, the present invention generates a preset master signal corresponding to the electronic component by using a servo signal fed back by the fan to limit the minimum master signal corresponding to the electronic component by using the preset master signal. It is worth mentioning that the meaning of the above minimum master signal is essentially the master signal that can reduce the fan speed to a minimum. Therefore, when it is required to immediately increase the fan speed, the present embodiment can directly increase the fan speed to a higher level based on the current speed of the fan. In addition, by increasing the basic rotational speed of the fan, the present invention can also achieve the effect of making the fan rotational speed more stable.

In order to more clearly illustrate the efficacy of the present invention, the conventional PID fan control technique will be compared with the measured results of the present invention. 3 is a graph showing the relationship between the sensed value and time of the electronic component, the master signal and time, and the servo signal of the fan in the conventional PID fan control technology. Referring to FIG. 3, a curve 301 is a relationship between a sensed value of an electronic component and a time in a prior art, wherein the sensed value of the electronic component corresponding to the temperature is referred to the right vertical axis of FIG. 3, which is in the PID control technology. The sensing parameters are represented. The curve 302 is a graph of the relationship between the main control signal and the time in the prior art. The reference value of the main control signal is the left vertical axis of FIG. 3, and the main control signal is represented by PWM. The curve 303 and the curve 304 are used to represent the PWM values corresponding to the servo signals of the two fans in each time unit. In addition, the time unit of FIG. 3 is in units of seconds.

First, as seen by curve 303 and curve 304, before 609 seconds, since the sensing values of other electronic components (for example, display cards) are higher, the PWM values of the servo signals of the two fans are maintained at about 80 and respectively. 100. Then, as seen by the curve 301, under the heat dissipation effect of the two fans, at 609 Before the second, the sensed value of the electronic component (for example, the CPU) is not high (for example, below a threshold), so the PWM value of the corresponding master signal is adjusted and maintained at about 25 as seen by the curve 302. . Assume that at 609 seconds, as seen by curve 301, the sensed value of an electronic component (e.g., CPU) suddenly increases substantially by about -11. At this time, as seen by the curve 302, the PWM value of the main control signal corresponding to the electronic component (for example, the CPU) is raised from about 25 to about 225.

In particular, when the curve 302 intersects the curve 303 and the curve 304, respectively, the PWM value of the main control signal of the electronic component begins to exceed the PWM value of the servo signals of the two fans, and the PWM of the servo signals of the two fans at this time The value will increase the fan speed due to the increase in the PWM value of the master signal. In other words, when the sensing value of the electronic component (for example, the CPU) suddenly increases sharply, the rotation speed of the fan does not increase immediately, but the PWM value of the main control signal of the electronic component (for example, the CPU) must be exceeded. When the PWM value of the servo signal of the two fans is started, the fan speed will start to increase to dissipate heat from the electronic components (for example, the CPU). Assuming that the sensed value of the electronic component (for example, the CPU) exceeds -5 may cause damage to the device, according to the result of the experiment, the time when the sensed value of the electronic component (for example, the CPU) exceeds -5 is about 150 seconds, indicating There is a great deal of potential damage to electronic components (for example, CPU).

On the other hand, FIG. 4 is a graph showing the sensed value and time of the electronic component, the main control signal and time, and the servo signal of the fan and time according to the actual measurement result according to an embodiment of the present invention. Referring to FIG. 4, a curve 401 is a sensing value of an electronic component (for example, the electronic component 11-1) in the embodiment. A graph of time versus time in which an electronic component (e.g., electronic component 11-1) corresponds to a sensed value of temperature, please refer to the right vertical axis of Figure 4, which is represented by sensed parameters in the PID control technique. The curve 402 is a graph of the relationship between the main control signal and the time of the electronic component (for example, the electronic component 11-1) in the embodiment. The reference value of the main control signal is the left vertical axis of FIG. 3, and the main control signal is Expressed in PWM. The curve 403 and the curve 404 are used to indicate the PWM values corresponding to the servo signals of the two fans (for example, the fans 12-1 and 12-2) in each time unit. In addition, the time unit of FIG. 4 is also in units of seconds.

Looking at the curve 403 and the curve 404, before 609 seconds, since the sensing values of other electronic components (for example, the electronic component 11-2) are high, two fans (for example, the fans 12-1 and 12-2) The PWM values of the servo signals are maintained at approximately 80 and 100, respectively. Next, as seen by the curve 401, under the heat dissipation of the two fans (for example, the fans 12-1 and 12-2), the sensed value of the electronic component (for example, the electronic component 11-1) is not before 609 seconds. High (eg, below a temperature threshold), so as seen by curve 402, the PWM value of the corresponding master signal of the electronic component (eg, electronic component 11-1) is adjusted and maintained at approximately 100 (ie, pre- The PWM value of the master signal is set to overlap with the curve 403. Assume that at 609 seconds, as seen by curve 401, the sensed value of the electronic component (e.g., electronic component 11-1) suddenly increases substantially by about -11. At this time, as seen by the curve 402, the PWM value of the main control signal corresponding to the electronic component (for example, the electronic component 11-1) is raised from about 100 to about 225.

In particular, since the PWM value of the main control signal has overlapped with the curve 403 and/or the curve 404 before 609 seconds, the PWM value of the main control signal will immediately drive two fans (for example, the fan 12- The servo signals of 1 and 12-2) are also simultaneously increased, and the fan speed can be immediately increased to dissipate heat from electronic components (for example, electronic component 11-1). Therefore, assuming that the sensed value of the electronic component (for example, the electronic component 11-1) exceeds -5 may cause damage to the device, the sensing of the electronic component (for example, the electronic component 11-1) according to the experimental result of the present embodiment The value hardly exceeds -5, and the risk of damage to the electronic device due to a sudden rise in temperature can be effectively reduced.

In summary, the fan speed control method and the electronic device in the embodiment of the present invention can determine whether the temperature of the electronic component in the electronic device is less than a temperature threshold. When the temperature of the electronic component in the electronic device is less than the temperature threshold, the preset master signal is generated according to the servo signal fed back by the fan, and the preset master signal is used as the master signal of the electronic component. Then, the servo signal of the fan is generated according to the main control signal of the electronic component, and the fan speed of the fan is controlled according to the servo signal of the fan. In other words, by limiting the minimum master signal corresponding to the electronic component, the present invention can be based on the current speed of the fan, and directly raises the fan speed to a higher level when the fan speed needs to be immediately increased. Thereby, the risk of damage to the electronic device due to a sudden rise in temperature of the electronic device can be effectively reduced.

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 does not deviate. In the spirit and scope of the present invention, the scope of protection of the present invention is defined by the scope of the appended claims.

10‧‧‧Electronic devices

11-1, 11-2‧‧‧ electronic components

12-1~12-5‧‧‧Fan

13‧‧‧Temperature Sensor

14‧‧‧Control Module

301~304, 401~404‧‧‧ Curve

S202, S204, S206, S208, S210, S212, S214, S216, ‧ ‧ each step of the fan speed control method according to an embodiment of the present invention

FIG. 1 is a functional block diagram of an electronic device according to an embodiment of the invention.

FIG. 2 is a schematic flow chart of a method for controlling a fan speed according to an embodiment of the invention.

3 is a graph showing the relationship between the sensed value and time of the electronic component, the master signal and time, and the servo signal of the fan in the conventional PID fan control technology.

FIG. 4 is a graph showing the sensed value and time of the electronic component, the master signal and time, and the servo signal of the fan and time according to the measured results according to an embodiment of the present invention.

S202, S204, S206, S208, S210, S212, S214, S216‧‧‧ steps of fan speed control method

Claims (10)

A fan speed control method is applicable to an electronic device having at least one fan, wherein the at least one fan controls a fan speed according to a servo signal of the at least one fan, and the fan speed control method includes: the at least one fan The control signal is fed back to a control module of the electronic device; the control module acquires a temperature threshold corresponding to an electronic component of the electronic device according to the servo signal of the at least one fan; Detecting a temperature of the electronic component; determining whether a temperature of the electronic component is less than the temperature threshold; when the temperature of the electronic component is less than the temperature threshold, generating according to the at least one fan control signal a preset master signal, and the preset master signal is used as the master signal of the electronic component; and the slave control signal of the at least one fan is generated according to the master signal of the electronic component. The fan speed control method of claim 1, further comprising: generating a servant of the at least one fan according to the weight value of the main control signal and the at least one fan respectively corresponding to the electronic component Control signal. The method for controlling the fan speed according to the second aspect of the invention, wherein the step of generating the preset master signal according to the at least one fan control signal comprises: according to the at least one fan control signal and The at least one fan respectively corresponds to a weight value of the electronic component, and the preset master signal is generated. The fan speed control method according to claim 3, wherein the preset master is generated according to a duty signal of the at least one fan and a weight value of the at least one fan corresponding to the electronic component. The step of controlling the signal includes: dividing the servo signal of the at least one fan by the weight value of the at least one fan corresponding to the electronic component to generate at least one candidate signal; and the at least one candidate signal The candidate signal with the smallest median value is used as the preset master signal. The fan speed control method of claim 1, further comprising: when the temperature of the electronic component is not less than the temperature threshold, generating a master control of the electronic component according to a temperature of the electronic component Signal. An electronic device comprising: at least one electronic component; at least one fan for controlling a fan speed according to a servo signal of the at least one fan; and a temperature sensor coupled to the at least one electronic component for sensing a temperature of a first electronic component of the at least one electronic component; and a control module coupled to the temperature sensing module and the at least one fan to determine whether the temperature of the first electronic component is less than a temperature threshold, wherein when the temperature of the first electronic component is less than the temperature threshold, the control module generates a servo signal according to the at least one fan a preset master signal, and the preset master signal is used as the master signal of the first electronic component, wherein the control module generates the at least one according to the master signal of the first electronic component a fan control signal, and controlling, according to the at least one fan control signal, a fan speed of the at least one fan, wherein the at least one fan feeds back the control signal of the at least one fan to the control a module, wherein the control module acquires the temperature threshold according to a servo signal of the at least one fan. The electronic device of claim 6, wherein the control module generates the at least one according to a weight value corresponding to the first electronic component and the at least one fan respectively. The servo signal of the fan. The electronic device of claim 7, wherein the control module generates a weighting value corresponding to the first electronic component according to a servo signal of the at least one fan and the at least one fan. The preset master signal. The electronic device of claim 8, wherein the control module divides the at least one fan control signal by the weight value of the at least one fan corresponding to the first electronic component, The candidate signal is generated to generate at least one candidate signal, and the candidate signal having the smallest value among the at least one candidate signal is used as the preset master signal. The electronic device of claim 6, wherein when the temperature of the first electronic component is not less than the temperature threshold, the control module generates the The master signal of the first electronic component.