WO2018152762A1

WO2018152762A1 - Terminal radiator device and noise control method

Info

Publication number: WO2018152762A1
Application number: PCT/CN2017/074725
Authority: WO
Inventors: 黄忠良
Original assignee: 华为技术有限公司
Priority date: 2017-02-24
Filing date: 2017-02-24
Publication date: 2018-08-30

Abstract

A terminal radiator device (100) and a noise control method. The device comprises: a voltage control module (101) and a module change-over switch (102). The module change-over switch (102) is used for establishing a connection between the voltage control module (101) and a radiator fan (103) of a terminal before the loading of a central processing unit (CPU) of the terminal is completed; the module change-over switch (102) is further used for disconnecting the voltage control module (101) from the radiator fan (103) after the loading of the CPU is completed, and establishing a connection between the CPU and the radiator fan (103). The voltage control module (101) is used for adjusting, according to a power supply duty cycle of the voltage control module (101), a driving voltage provided to the radiator fan (103) before the loading of the CPU is completed. The device and method can reduce the design complexity of the terminal radiator device (100) and improve the applicability of the terminal radiator terminal (100).

Description

Terminal heat sink and noise control method

Technical field

The present invention relates to the field of electronic technologies, and in particular, to a terminal heat sink and a noise control method.

Background technique

With the rapid development of the technology of terminals such as computers or home appliances, the main frequency and power consumption of the terminal's central processing unit (CPU) have also increased, and the importance of terminal cooling technology has become increasingly prominent. The fan is one of the important components of the terminal cooling system. The terminal meets the heat dissipation requirements of the terminal system by controlling the rotation of the fan. However, noise is generated during the rotation of the fan. Too much noise will reduce the user experience of the terminal, so the control of fan noise is also very important. In order to control the fan noise while achieving the expected heat dissipation effect, the current temperature of the terminal CPU and the temperature inside the chassis dynamically adjust the fan speed to achieve the dynamic balance of the fan's heat dissipation and noise. However, in the initial stage of power-on of the terminal, the CPU cannot work normally when the load is not completed, and thus the fan speed cannot be controlled. At this time, the fan runs at full speed, the noise is large, and the terminal may fail to start under low temperature conditions.

The prior art adds a plurality of devices independent of the CPU in the heat dissipation system of the terminal, including a terminal activation state recognition device, a temperature reading device, and a control device. The terminal startup state identifying device is configured to identify that the startup state of the terminal is a state of initial power-on or restart. The temperature reading device is for reading the temperature of the terminal system, and the control device is for controlling the starting strength of the fan according to the terminal starting state and the terminal system temperature. The prior art requires multiple core modules to be added outside the CPU. The newly added core modules need to complete the identification of the terminal startup state, the reading of the terminal system temperature, and the control of the fan startup strength. The prior art hardware design is complicated. High degree, difficult to achieve, low applicability.

Summary of the invention

The application provides a terminal heat dissipation device and a noise control method, which can reduce the design complexity of the terminal heat dissipation device and improve the applicability of the noise control mode of the terminal heat dissipation device.

The first aspect of the present application provides a terminal heat sink, which may include:

Voltage control module and module switching switch;

The module switching switch is configured to establish a connection between the voltage control module and a cooling fan of the terminal before the loading of the central processing unit CPU of the terminal is completed;

The module switching switch is further configured to disconnect the voltage control module from the cooling fan after the CPU is loaded, and establish a connection between the CPU and the cooling fan;

The voltage control module is configured to adjust a driving voltage provided to the heat dissipation fan according to a power supply duty thereof before the CPU is loaded.

The application can output the driving voltage of the adjustable power supply duty ratio to the terminal fan through the voltage control module before the CPU loading of the terminal is completed, and control the speed of the fan by adjusting the power supply duty ratio of the voltage control module, thereby improving the fan speed. Controlling, in turn, prevents the fan from rotating at full speed during the initial stage of powering up the terminal, thereby increasing the user experience of the terminal.

In conjunction with the first aspect, in a first possible implementation, the voltage control module includes a clock generation circuit or Pulse generation circuit.

The voltage control module described in the present application can be a clock generation circuit or a pulse generation circuit, has a simple circuit design, low implementation cost, and high applicability.

In conjunction with the first possible implementation of the first aspect, in a second possible implementation, the clock generating circuit or the pulse generating circuit includes: a crystal oscillator, a multivibrator, a monostable trigger, and a Schmitt trigger At least one of the devices.

The clock generation circuit or the pulse generation circuit described in the present application can include a variety of representations of devices, and the selection is diverse, which increases the flexibility of circuit design.

With reference to any one of the first aspect to the second possible implementation manner of the first aspect, in a third possible implementation, the driving voltage includes a plurality of order driving voltages, wherein each order The driving voltage corresponds to a power supply duty ratio of the voltage control module, and the driving voltage of each order corresponds to one rotation speed of the fan.

In the present application, the driving voltage corresponding to each power supply duty ratio can be set, and the rotational speed of the fan can be controlled by the driving voltage, which is simple in operation and low in design cost.

With reference to the first aspect to any one of the third possible implementation manners of the first aspect, in a fourth possible implementation, the terminal heat dissipation device further includes: an anti-hanging device;

The anti-hanging device is connected between the module switching switch and the cooling fan, and is configured to be the cooling fan when the voltage control module or the CPU provides an abnormality in the driving voltage of the cooling fan. A driving voltage is supplied to prevent the cooling fan from hanging.

The application adds an anti-hanging device to the terminal heat sink to prevent the terminal CPU or the voltage control module from providing an abnormality in the driving voltage of the fan, and the fan of the terminal hangs, thereby improving the stability of the terminal heat sink and improving the heat dissipation of the fan. Reliability.

A second aspect of the present application provides a noise control method for a terminal heat sink, which may include:

When the terminal is started, the voltage control module establishes a connection with the cooling fan of the terminal through the module switching switch;

The voltage control module adjusts a driving voltage outputted to the heat dissipation fan according to a power supply duty thereof, and adjusts a rotation speed of the heat dissipation fan by the driving voltage;

When the central processor CPU loading of the terminal is completed, the module switching switch disconnects from the voltage control module, and establishes a connection with the CPU to provide driving for the cooling fan through the CPU. Voltage.

In conjunction with the second aspect, in a first possible implementation, the voltage control module includes a clock generation circuit or a pulse generation circuit.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the clock generating circuit or the pulse generating circuit includes: a crystal oscillator, a multivibrator, a monostable trigger, and a Schmitt trigger At least one of the devices.

With reference to any one of the second aspect to the second possible implementation manner of the second aspect, in a third possible implementation, the driving voltage includes a plurality of order driving voltages, wherein each order The driving voltage corresponds to a power supply duty ratio of the voltage control module, and the driving voltage of each order corresponds to one rotating speed of the fan;

The voltage control module adjusts a driving voltage outputted to the heat dissipation fan according to a power supply duty ratio thereof, including:

The voltage control module adjusts the power supply duty ratio according to the speed requirement of the heat dissipation fan, and according to the adjusted The power supply duty ratio determines a driving voltage output to the heat dissipation fan.

With reference to any one of the second aspect to the third possible implementation manner of the second aspect, in a fourth possible implementation, the method further includes:

Establishing a connection between the cooling fan and the anti-hanging device of the terminal;

The anti-hanging device is configured to provide a driving voltage for the cooling fan to prevent the cooling fan from hanging when the voltage control module or the CPU provides an abnormality in the driving voltage of the cooling fan.

In the initial stage of power-on of the terminal, before the CPU loading of the terminal is completed, the driving voltage of the adjustable power supply duty ratio can be output to the terminal fan through a voltage control module such as a crystal oscillator, and the fan is controlled by adjusting the power supply duty ratio of the voltage control module. The speed of the fan improves the controllability of the fan speed, thereby preventing noise interference caused by the full-speed rotation of the fan in the initial stage of powering up the terminal, and improving the user experience of the terminal. The terminal heat dissipating device provided by the present application only needs to add a crystal oscillator and a switch in addition to the fan and the CPU included in the terminal heat dissipation system, thereby realizing the controllability of the terminal fan speed in the initial stage of the terminal power-on, the circuit design is simple, and the realization cost is low. , high applicability. The application can also improve the stability of the terminal fan rotation through the anti-hanging device, and improve the reliability of the terminal heat sink device.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is a schematic structural diagram of a terminal fan control device provided by a prior implementation manner;

2 is another schematic structural diagram of a terminal fan control device provided by a prior implementation manner;

3 is a schematic structural diagram of a terminal heat dissipation device according to an embodiment of the present invention;

4 is another schematic structural diagram of a terminal heat dissipation device according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a noise control method of a terminal heat dissipation device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

In a specific implementation, the terminal provided by the embodiment of the present invention may specifically be a device that uses a fan to dissipate heat and is sensitive to noise, and may include: a computer, a server, an air purifier, a household appliance, a home digital product, a wireless router, and a network communication. Equipment, etc. The above devices are merely examples, and are not exhaustive, including but not limited to the above devices. It can be determined according to the actual application scenario, and no limitation is imposed here.

In the specific implementation, during the operation of the terminal system, the CPU of the terminal can generate a pulse width modulation (PWM) wave, control the power supply duty cycle of the CPU through the PWM wave, and adjust the fan by the power supply duty ratio of the CPU. The supply voltage, that is, the driving voltage of the cooling fan (hereinafter referred to as the fan). However, in the initial stage of powering up the terminal, the CPU of the terminal has not been loaded yet, and the CPU is still unable to work normally, and the driving voltage of the fan cannot be adjusted. In addition, fans without CPU control will rotate at full speed, which will generate more noise and may be due to temperature. Lower environmental conditions cause the terminal to fail to start, which in turn reduces the user experience of the terminal.

Referring to FIG. 1 , it is a schematic structural diagram of a terminal fan control device provided by a prior implementation. In order to solve the problem that the terminal fan rotates at full speed and brings a large noise before the CPU is loaded, most of the current terminal devices adopt the method of adding an independent controller to control the speed of the terminal fan. As shown in FIG. 1 , the existing implementation adds a fan controller to the CPU of the terminal, and the fan controller can be preset in the fan controller. When the terminal is powered on, the fan controller can work normally, and then the driving voltage of the fan can be controlled, and the driving speed of the fan can be controlled by controlling the driving voltage of the fan. In the prior implementation, the fan controller is specifically a programmable logic device or a fan control integrated chip dedicated to fan control, and the device has high design cost and low applicability.

Referring to FIG. 2, it is another schematic structural diagram of a terminal fan control device provided by the prior implementation. The existing implementation adds a plurality of devices independent of the CPU in the heat dissipation system of the terminal, including: a terminal activation state recognition device, a temperature reading device, and a control device. The terminal startup state identifying device is configured to identify that the startup state of the terminal is a state of initial power-on or restart. The temperature reading device is for reading the temperature of the terminal system, and the control device is for controlling the starting strength of the fan according to the terminal starting state and the terminal system temperature. Wherein, the terminal activation state recognition device, the temperature reading device and the control device are independent active programmable devices, which will bring additional device design to the terminal heat dissipation system, increase the hardware design complexity of the terminal, and improve The hardware design cost of the terminal is low and the applicability is low.

The embodiment of the invention provides a terminal heat dissipating device, which has simple design, low implementation cost and high applicability.

FIG. 3 is a schematic structural diagram of a terminal heat dissipation device according to an embodiment of the present invention. The terminal heat sink 100 provided by the embodiment of the present invention includes a module such as a voltage control module 101, a module switch 102, and a fan 103. The output end of the module changeover switch 102 is connected to the fan 103, and the voltage control module 101 is connected to the terminal fan 103 through the module changeover switch 102. The module switch 102 can be a single-pole double-throw switch, or a multi-way selector, or other switch module having a multi-channel data input selection function, which is not limited herein.

In a specific implementation, the module switch 102 can also establish a connection with the CPU of the terminal, and the module switch 102 can determine the module that provides the driving voltage for the fan of the terminal by switching the module to which the module is connected to the voltage control module 101 or the CPU of the terminal. It is the voltage control module 101 or the CPU of the terminal.

In some feasible implementation manners, after the terminal is powered on, the CPU of the terminal needs to complete the loading first, and the normal operation is performed after the loading is completed. The CPU cannot adjust the speed of the terminal fan until the CPU loading of the terminal is completed. At this time, the signal output by the CPU to the module changeover switch 102 may be empty by default. For example, before the CPU loading of the terminal is completed, the signal output by the CPU to the module switching switch 102 may be a low level signal, for example, '0'. At this time, the module switching switch 102 can be connected to the voltage control module 101 to pass The voltage control module 101 adjusts the rotational speed of the terminal fan 103. The voltage control module 101 can provide a driving voltage to the fan 103 before the CPU completes loading. After the CPU loading of the terminal is completed, a high level signal can be output to the module switch 102, such as '1'. At this time, the module switching module 102 can turn on the connection with the CPU of the terminal to supply the driving voltage to the terminal fan 103 through the CPU of the terminal, and control the rotation speed of the terminal fan 103.

In some feasible implementation manners, the voltage control module 101 can determine the speed requirement of the fan in the initial stage of the power-on of the terminal according to the fan noise requirement of the terminal heat dissipation system, and further, the power supply that meets the fan speed requirement can be set according to the fan speed requirement. Empty ratio. The voltage control module 101 can adjust the power supply duty ratio of the output voltage thereof, and output a corresponding driving voltage to the fan, so that the fan rotates according to the determined rotational speed requirement, and the noise of the fan rotation can be controlled to the fan noise requirement. Within the scope, the noise controllability of the terminal cooling system is improved.

In some possible implementations, the voltage control module 101 described above may include a clock generation circuit or a pulse generation circuit. The clock generation circuit or the pulse generation circuit includes at least one of a crystal oscillator, a multivibrator, a monostable trigger, and a Schmitt trigger. The above multi-vibrator may include a multi-vibrator with several resistors and capacitors externally connected to the 555 timer, and a multi-vibrator realized by other components, which is not limited herein. The crystal oscillator will be described as an example below. FIG. 4 is another schematic structural diagram of a terminal heat dissipation device according to an embodiment of the present invention. The terminal heat sink 100 provided by the embodiment of the invention includes a crystal oscillator 1011, a module switch 102 and a fan 103. In the initial stage of power-on of the terminal, before the CPU loading is completed, the crystal oscillator 1011 can output driving voltages of different orders to the terminal fan 103 according to different power supply duty cycles. The driving voltage of each order corresponds to one power supply duty ratio of the crystal oscillator 1011, and the driving voltage of each order corresponds to one rotation speed of the fan 103. That is, each power supply duty ratio of the crystal oscillator 1011 corresponds to one rotation speed of the fan 103. For example, the crystal oscillator 1011 can output a driving voltage corresponding to a 50% power supply duty ratio to the fan 103, and the rotational speed of the fan by the driving voltage drop is adjusted to 50%, that is, 50% of the rotational speed of the fan 103 at full speed. If the fan 103 needs to be adjusted to a lower rotation speed, it can be realized by adjusting the power supply duty ratio of the crystal oscillator, and adjusting the rotation speed of the fan 103 by adjusting the power supply duty ratio of the crystal oscillator, thereby further controlling the noise caused by the rotation of the fan. influences.

In some feasible implementation manners, after the CPU loading of the terminal is completed, the module switching switch 102 switches its input terminal to the CPU of the terminal to establish a connection between the CPU of the terminal and the fan 103. After the CPU establishes the connection with the fan 103 through the module switching switch 102, the driving voltage output to the fan 103 can be adjusted by the PWM wave generated by the CPU, and the detection of the terminal startup state is not required, and the rotation speed of the fan during the terminal startup process is not dependent on the CPU. Control, realize simple circuit, low design difficulty, reduce the difficulty of fan noise control, and high applicability.

In some possible implementation manners, referring to FIG. 4, the terminal heat dissipation device provided by the embodiment of the present invention further includes: an anti-hanging device 104. Wherein, the anti-hanging device may specifically comprise a device such as a triode and a resistor r. The collector of the above-mentioned transistor is connected to the power source VCC through a resistor r, the emitter of the transistor is grounded, and the base of the transistor is connected to the output terminal of the module control switch 102. The fan 103 is connected between the collector and the emitter of the triode.

In a specific implementation, the anti-hanging device 104 is configured to provide a driving voltage for the fan 103 when the CPU of the voltage control module 101 or the terminal provides an abnormality of the driving voltage for the fan 103, so as to prevent the fan 103 from hanging, and the heat dissipating device can be improved. Stability, improve the reliability of the terminal heat sink.

In the embodiment of the present invention, before the CPU loading of the terminal is completed, the driving voltage of the fixed or adjustable power supply duty ratio can be output to the terminal fan through the voltage control module such as a crystal oscillator, and the voltage control module is adjusted. The power supply duty cycle controls the speed of the fan, which improves the controllability of the fan speed, thereby preventing the fan from rotating at full speed during the initial stage of powering up the terminal, thereby improving the user experience of the terminal. The terminal heat dissipating device provided by the embodiment of the invention only needs to add a crystal oscillator and a switch to the fan and the CPU included in the terminal heat dissipation system, so that the terminal fan speed can be controlled in the initial stage of the terminal power-on, and the circuit design is simple and realized. Low cost and high applicability. In the embodiment of the invention, the stability of the terminal fan rotation can be improved by the anti-hanging device, and the reliability of the terminal heat dissipation device can be improved.

FIG. 5 is a schematic flowchart of a noise control method of a terminal heat dissipation device according to an embodiment of the present invention. The noise control method provided by the embodiment of the present invention can be applied to the terminal heat dissipation device provided by the foregoing embodiment of the present invention, and specifically, the steps described in each step of the noise control method of the terminal heat dissipation device can be performed by each module included in the terminal heat dissipation device. Method to realize. The noise control method of the terminal heat sink provided by the embodiment of the invention includes the following steps:

S501: When the terminal is started, the voltage control module establishes a connection with the cooling fan of the terminal through the module switching switch.

In some possible implementation manners, after the terminal is powered on, the CPU of the terminal needs to complete loading first, and the loading is completed. After that, it will run normally. The CPU cannot adjust the speed of the terminal fan until the CPU loading of the terminal is completed. At this time, the signal output from the CPU to the module switch can be empty by default. For example, before the CPU loading of the terminal is completed, the signal output by the CPU to the module switching switch may be a low level signal, such as '0'. At this time, the module switching switch may be connected to the voltage control module. The voltage control module establishes a connection with the fan through the module switching switch, thereby adjusting the speed of the terminal fan. The voltage control module provides the drive voltage to the fan before the CPU finishes loading. After the CPU loading of the terminal is completed, a high level signal can be output to the module switching switch, for example, '1'. At this time, the module switching module can be connected to the CPU of the terminal to provide a driving voltage to the terminal fan through the CPU of the terminal, and control the rotation speed of the terminal fan.

S502. The voltage control module adjusts a driving voltage outputted to the heat dissipation fan according to a power supply duty thereof, and adjusts a rotation speed of the heat dissipation fan by the driving voltage.

In some feasible implementation manners, the voltage control module can determine the speed requirement of the fan in the initial stage of powering up the terminal according to the fan noise requirement of the terminal heat dissipation system, and then set the power supply duty to meet the fan speed requirement according to the fan speed requirement. ratio. The voltage control module can adjust the power supply duty ratio of the output voltage to output a corresponding driving voltage to the fan, so that the fan rotates according to the speed determined by the above-mentioned determined speed, thereby controlling the noise of the fan rotation to the fan noise requirement. Within the scope, the noise controllability of the terminal cooling system is improved.

In some possible implementations, the voltage control module described above may include a clock generation circuit or a pulse generation circuit. The clock generation circuit or the pulse generation circuit includes at least one of a crystal oscillator, a multivibrator, a monostable trigger, and a Schmitt trigger. The above multi-vibrator may include a multi-vibrator with several resistors and capacitors externally connected to the 555 timer, and a multi-vibrator realized by other components, which is not limited herein. The crystal oscillator will be described as an example below. In the initial stage of power-on of the terminal, before the CPU loading is completed, the crystal oscillator can output different order driving voltages to the terminal fan according to different power supply duty cycles. Wherein, the driving voltage of each order corresponds to one power supply duty ratio of the crystal oscillator, and the driving voltage of each order corresponds to one rotating speed of the fan. That is, each power supply duty cycle of the crystal oscillator corresponds to one rotational speed of the fan. For example, the crystal oscillator can output a driving voltage corresponding to a 50% power supply duty cycle to the fan, and the speed of the fan by the driving voltage drop is adjusted to 50%, that is, 50% of the rotation speed of the fan at full speed. If the fan needs to be adjusted to a lower speed, it can be adjusted by adjusting the duty cycle of the crystal oscillator. The speed of the fan can be adjusted by adjusting the duty cycle of the crystal oscillator, so that the noise caused by the fan rotation can be better controlled.

S503, when the CPU of the terminal is loaded, the module switching switch disconnects from the voltage control module, and establishes a connection with the CPU to pass the CPU as the cooling fan. Provide drive voltage.

In some possible implementation manners, after the CPU loading of the terminal is completed, the module switching switch switches its input end to the CPU of the terminal, and establishes a connection between the CPU of the terminal and the fan. After the CPU establishes the connection with the fan through the module switching switch, the PWM wave generated by the CPU can be adjusted to the driving voltage of the fan without detecting the startup state of the terminal, and the rotation speed of the fan during the terminal startup process does not depend on the control of the CPU. The circuit is simple, the design difficulty is low, the difficulty of fan noise control is reduced, and the applicability is high.

In some possible implementations, the fan may also be coupled to an anti-hanging device included in the heat sink. When the CPU of the voltage control module or the terminal provides abnormality to the driving voltage of the fan, the driving voltage can be provided to the fan through the anti-hanging device to prevent the fan from hanging, thereby improving the stability of the heat dissipating device and improving the heat dissipating device of the terminal. reliability.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

Claims

A terminal heat dissipation device, comprising:

Voltage control module and module switching switch;

The module switching switch is configured to establish a connection between the voltage control module and a cooling fan of the terminal before the loading of the central processing unit CPU of the terminal is completed;

The module switching switch is further configured to disconnect the voltage control module from the cooling fan after the CPU is loaded, and establish a connection between the CPU and the cooling fan;

The voltage control module is configured to adjust a driving voltage provided to the heat dissipation fan according to a power supply duty thereof before the CPU is loaded.
The terminal heat sink according to claim 1, wherein said voltage control module comprises a clock generating circuit or a pulse generating circuit.
The terminal heat sink according to claim 2, wherein the clock generating circuit or the pulse generating circuit comprises at least one of a crystal oscillator, a multivibrator, a monostable trigger, and a Schmitt trigger.
The terminal heat sink according to any one of claims 1 to 3, wherein the driving voltage comprises a plurality of order driving voltages, wherein each order driving voltage corresponds to one of the voltage control modules The duty cycle of the power supply, the drive voltage of each order corresponds to one speed of the fan.
The terminal heat sink according to any one of claims 1 to 4, wherein the terminal heat sink further comprises: an anti-hanging device;

The anti-hanging device is connected between the module switching switch and the cooling fan, and is configured to be the cooling fan when the voltage control module or the CPU provides an abnormality in the driving voltage of the cooling fan. A driving voltage is supplied to prevent the cooling fan from hanging.
A noise control method for a terminal heat sink is characterized by comprising:

When the terminal is started, the voltage control module establishes a connection with the cooling fan of the terminal through the module switching switch;

The voltage control module adjusts a driving voltage outputted to the heat dissipation fan according to a power supply duty thereof, and adjusts a rotation speed of the heat dissipation fan by the driving voltage;

When the central processor CPU loading of the terminal is completed, the module switching switch disconnects from the voltage control module, and establishes a connection with the CPU to provide driving for the cooling fan through the CPU. Voltage.
The method of claim 6 wherein said voltage control module comprises a clock generation circuit or a pulse generation circuit.
The method of claim 7 wherein said clock generating circuit or pulse generating circuit comprises: At least one of a crystal oscillator, a multivibrator, a monostable flip-flop, and a Schmitt trigger.
The method according to any one of claims 6-8, wherein the driving voltage comprises a plurality of order driving voltages, wherein each order driving voltage corresponds to a voltage supply of the voltage control module Air ratio, the driving voltage of each order corresponds to one speed of the fan;

The voltage control module adjusts a driving voltage outputted to the heat dissipation fan according to a power supply duty ratio thereof, including:

The voltage control module adjusts a power supply duty ratio according to the rotation speed requirement of the heat dissipation fan, and determines a driving voltage output to the heat dissipation fan according to the adjusted power supply duty ratio.
The method of any of claims 6-9, wherein the method further comprises:

Establishing a connection between the cooling fan and the anti-hanging device of the terminal;

The anti-hanging device is configured to provide a driving voltage for the cooling fan to prevent the cooling fan from hanging when the voltage control module or the CPU provides an abnormality in the driving voltage of the cooling fan.