CN101858357B - Fan control method and device - Google Patents

Fan control method and device Download PDF

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Publication number
CN101858357B
CN101858357B CN201010209115.3A CN201010209115A CN101858357B CN 101858357 B CN101858357 B CN 101858357B CN 201010209115 A CN201010209115 A CN 201010209115A CN 101858357 B CN101858357 B CN 101858357B
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fan
rotating speed
electronic equipment
fans
control
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CN101858357A (en
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王治平
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ZTE Corp
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ZTE Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The invention discloses fan control method and device, which are used for electronic equipment comprising at least two fans. The method comprises the following steps of: respectively arranging rotating speed control data of the fans according to the heating state of the electronic equipment; and adjusting the rotating speeds of the fans according to the rotating speed control data of the fans. The step of adjusting the rotating speeds of the fans according to the rotating speed control data of the fans concretely comprises the steps of: converting the rotating speed control data of the fans into a pulse duration modulation signal; outputting the pulse duration modulation signal to the fans, and adjusting the rotating speeds of the fans. By adopting the fan control method and the device, the rotating speeds of the fans are respectively adjusted according to the component number, types and combined state in the electronic equipment and internal and external environment temperatures of the electronic equipment, and the energy saving of the electronic equipment is realized.

Description

Control method for fan and device
Technical field
The present invention relates to electronic equipment, specially refer to a kind of control method for fan and device.
Background technology
Electronic equipment is provided with the assemblies such as such as main control card, line card and power supply to high-density in casing inside, these assemblies generate heat along with electronic device works, and along with the high speed development of Internet technology, Network Traffic amount is increasing, and the thermal value of these assemblies is also increasing.Simultaneously, because electronic equipment is the long-term electronic equipment running without interruption, the thermal value of electronic equipment must be discharged to electronic device shell outside in time, in order to avoid be accumulated in electronic device shell inside, the serviceability that affects electronic equipment, causes damage to electronic equipment even.
The fan that is arranged on electronic device shell inside is being born the substantial responsibility of heat radiation and protection electronic equipment, by cool exterior air being sucked to casing inside, takes away heat through the air channel in casing, hot-air is discharged to casing outside and realize heat radiation.
Fan index of correlation and relation thereof:
Rotation speed of the fan: more wind-force is stronger for rotation speed of the fan conventionally, better to the heat dispersion of electronic equipment, but fan also can generate heat simultaneously, and more self-heating amount is larger for rotation speed of the fan.
Fan power: more power is larger for rotation speed of the fan conventionally, and electricity loss is larger, the rotating speed that reduces fan can reduce electricity loss, realizes energy-conservation.
Fan noise: more noise is larger for rotation speed of the fan conventionally, the rotating speed that reduces fan can reduce noise, improves working environment.
With reference to Fig. 1, the CPU20 of the electronic equipment fan control device of prior art controls fan group 30 by logic control circuit 10, the interior all fans of fan group 30 are with identical rotary speed working, when in electronic equipment, when ambient temperature or key component change, all fans are also raise simultaneously or be reduced to a rotating speed simultaneously, there is a defect in this control method for fan, because electronic equipment internal diverse location and assembly, its heating situation is different, the first fan 301, the second fan 302, three fan 303 is different with the heat of N fan 304 present positions, for the indiscriminate control of all fans, make some fan must be with too high rotary speed working, will produce extra power consumption and noise.
Summary of the invention
Fundamental purpose of the present invention, for a kind of control method for fan and device are provided, can be adjusted respectively the rotating speed of described fan, realizes the energy-conservation of electronic equipment.
The present invention proposes a kind of control method for fan, for comprising the electronic equipment of at least two fans, comprises step:
According to the heating situation of described electronic equipment, the rotating speed control data of described fan are set respectively;
According to the rotating speed control data of described fan, adjust the rotating speed of described fan.
Preferably, described according to the rotating speed control data of fan, the rotating speed of adjusting fan specifically comprises:
The rotating speed control data of described fan are converted into pulse-width signal;
Export described pulse-width signal to described fan, adjust the rotating speed of described fan.
Preferably, described according to the heating situation of electronic equipment, the rotating speed control data that fan is set respectively specifically comprise:
The rotating speed of described fan is set respectively, the rotating speed of described fan is set respectively, the rotating speed of described fan is set respectively and/or the rotating speed of described fan is set respectively according to environment temperature according to the various combination of line card and power supply according to the various combination of light mouth line card and electricity mouthful line card according to subcard type.
Preferably, according to the heating situation of described electronic equipment, the rotating speed control data that fan is set respectively further comprise:
In the time that described electronic equipment does not have installation component, stop all fans or be reduced to preset rotation speed, described assembly comprises main control card, line card and power supply.
Preferably, described according to the heating situation of electronic equipment, before the rotating speed control data of fan are set respectively, also comprise step:
In the time that described electronic equipment does not have installation component, stop all fans, otherwise read electric device interior environment temperature the initial speed of all fans is set, described assembly comprises main control card, line card and power supply.
The present invention also proposes a kind of fan control device, and for comprising the electronic equipment of at least two fans, described fan control device is connected with described fan, comprises CPU and logic control circuit,
Described CPU, for according to the heating situation of described electronic equipment, arranges respectively the rotating speed control data of described fan;
Described logic control circuit, for according to the rotating speed control data of described fan, adjusts the rotating speed of described fan.
Preferably, described logic control circuit comprises: control signal module, for the rotating speed control data of described fan are converted into pulse-width signal; Speed adjusting module, for exporting described pulse-width signal to described fan, adjusts the rotating speed of described fan.
Preferably, described CPU comprises:
Daughter card module, for arranging respectively the rotating speed of described fan according to subcard type; And/or,
Line card module, for arranging respectively the rotating speed of described fan according to the various combination of light mouth line card and electricity mouthful line card; And/or,
Assembly module, for arranging respectively the rotating speed of described fan according to the various combination of line card and power supply; And/or,
Thermal module, for arranging respectively the rotating speed of described fan according to environment temperature.
Preferably, described CPU also comprises detection module, in the time that described electronic equipment does not have installation component, stops all fans or is reduced to preset rotation speed, and described assembly comprises main control card, line card and power supply.
Preferably, described CPU also comprises initialization module, in the time that described electronic equipment does not have installation component, stops all fans, otherwise read electric device interior environment temperature also arranges the initial speed of all fans, and described assembly comprises main control card, line card and power supply.
Control method for fan and device that the present invention proposes, according to electronic equipment inner assembly quantity, type, combined state and the inside and outside portion of electronic equipment environment temperature, adjust respectively the rotating speed of fan, realizes the energy-conservation of electronic equipment.
Brief description of the drawings
Fig. 1 is the structural representation of prior art cooling system;
Fig. 2 is the schematic flow sheet of control method for fan one embodiment of the present invention;
Fig. 3 is the schematic flow sheet of the another embodiment of control method for fan of the present invention;
Fig. 4 is the front view of the electronic equipment that the present invention is based on;
Fig. 5 is the electronic equipment that the present invention is based on vertical view when line card is installed;
Fig. 6 is the electronic equipment that the present invention is based on vertical view when main control card is installed;
Fig. 7 is the structural representation of fan control device one embodiment of the present invention.
Realization, functional characteristics and the advantage of the object of the invention, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Control method for fan and device that the present invention proposes, according to electronic equipment inner assembly quantity, type, combined state and the inside and outside portion of electronic equipment environment temperature, adjust respectively the rotating speed of fan, realizes the energy-conservation of electronic equipment.
With reference to Fig. 2, an embodiment of control method for fan of the present invention is proposed, for comprising the electronic equipment of at least two fans, comprising:
Step 101, according to the heating situation of electronic equipment, arranges respectively the rotating speed control data of fan;
Specifically comprise:
The rotating speed of fan is set respectively, the rotating speed of fan is set respectively, the rotating speed of fan is set respectively and/or the rotating speed of fan is set respectively according to environment temperature according to the various combination of line card and power supply according to the various combination of light mouth line card and electricity mouthful line card according to subcard type.
Step 102, according to the rotating speed control data of fan, adjusts the rotating speed of fan.
Specifically comprise:
The rotating speed control data of fan are converted into pulse-width signal;
Output pulse width modulation signal, to described fan, is adjusted the rotating speed of fan.
With reference to Fig. 3, the another embodiment of control method for fan of the present invention is proposed, in the above-described embodiments, step 101 also comprises:
In the time that electronic equipment does not have installation component, stop all fans or be reduced to preset rotation speed, said modules comprises main control card, line card and power supply, main control card can comprise subcard.
Before step 101, also comprise:
Step 100, in the time that electronic equipment does not have installation component, stops all fans, otherwise read electric device interior environment temperature the initial speed of all fans is set, said modules comprises main control card, line card and power supply, main control card can comprise subcard.
Describe the principle of work of control method for fan embodiment of the present invention below in detail.
Fig. 4 is the front view of electronic equipment, generally includes the fan group 12 of several fan compositions and the assembly of several equipment, and assembly comprises power supply 13, main control card and line card etc., and main control card can comprise subcard, and assembly is positioned in draw-in groove.Wherein, the thermal value of 1 power supply is about 4 times of 1 line card, and the rotating speed that each fan is set respectively according to the various combination of line card and power supply is as shown in table 1:
Table 1
Rotation speed of the fan gear in above table is multiplied by the current rotating speed of each fan, obtains the rotating speed that in electronic equipment, each fan should be adjusted, the current rotating speed of each fan may be identical may be not identical yet.
Vertical view when Fig. 5 is the installation line card of electronic equipment, two draw-in groove A141 of electronic device shell inside and draw-in groove B142 can install light mouth line card or electricity mouthful line card, the main heater members of light mouth line card is in line card front portion, comprise that taking electronic equipment 3 fans are as example, in fan group, being positioned at anterior fan C123 is its heat radiation main fan, the main heater members of electricity mouthful line card is at line card postmedian, and the fan A121 and the fan B122 that in fan group, are positioned at postmedian are its heat radiation main fans.The rotating speed that each fan is set respectively according to the various combination of light mouth line card and electrical equipment line card is as shown in table 2:
Table 2
According to the various combination of electricity mouthful line card and light mouth line card in above table, fan A121, fan B122 and the current rotating speed of fan C123 are multiplied by respectively to corresponding percentage, obtain the rotating speed of each fan that should adjust.
Figure 6 shows that the vertical view of electronic equipment in the time that main control card is installed, main control card in electronic equipment and subcard can select to install the assembly of different model, when the assembly of different model is installed, the model differences such as its CPU comprising, exchange chip, physical chip, thermal value is also different.The different assemblies such as gigabit light openning card, gigabit electricity openning card or 10,000,000,000 smooth openning cards can be selected to install in such as subcard position, gigabit light openning card is not with physical chip, gigabit electricity openning card and 10,000,000,000 smooth openning cassette tapes have physical chip, and the physical chip thermal value of 10,000,000,000 smooth openning cards is higher than the physical chip thermal value of gigabit electricity openning card.The rotating speed that each fan is set respectively according to subcard type is as shown in table 3:
Table 3
According to position relationship, subcard type major effect fan C123 rotating speed, can only adjust the rotating speed of fan C123 according to subcard type cases, according to the number of fans of installing in electronic equipment, on the position of fan C123, one or more fans can be installed, according to position relationship, the rotating speed of these fans all can be subject to the impact of subcard type.
It should be noted that table 1 arranges when the electronic equipment initialization to the rotation speed of the fan gear described in table 3, and can adjust according to different actual needs.
Can mounting temperature sensor at electronic equipment air intake vent and air outlet, be connected to fan control device by I2C bus, the air themperature that reads air intake vent by fan control device timing is as electronic device exterior environment temperature, and the air themperature that timing reads out air port is as electronic equipment internal environment temperature.In the time detecting ambient temperature higher than 65 DEG C, force all fans on original rotating speed basis, improving 20% of each fan greatest physical rotating speed separately, in the time detecting ambient temperature higher than 50 DEG C, force all fans on original rotating speed basis, to improve 10% of each fan greatest physical rotating speed.In the time detecting interior environment temperature higher than 65 DEG C, force all fans on original rotating speed basis, improving 10% of each fan greatest physical rotating speed separately.It should be noted that above-mentioned related " 65 DEG C " and " 50 DEG C " temperature parameter can be configured by the user of electronic equipment, to adapt to country variant and regional user's demand.
The data that assembly situation in electronic equipment timing detected electrons equipment and temperature sensor are beamed back, according to the rotating speed of above four combined factors adjustment fan.
The adjustment of above-mentioned all rotation speeds of the fan all realizes based on control method for fan, for each fan in fan group, in logic control circuit for it distributes one group of register, every group of register is only responsible for arranging the rotating speed of this fan, CPU is by this group register of steering logic control circuit, trigger the logical process of logic control circuit, adjust separately the rotating speed of this fan.
First, CPU arranges respectively the rotating speed control data of each fan, and above-mentioned data are exported in the register of each fan of correspondence of logic control circuit, secondly, rotating speed control data are converted into pulse-width signal by logic control circuit, export pulse-width signal to each fan, reach the object of adjusting rotation speed of the fan.
In the time that electronic equipment starts, while thering is no installation component as detected electrons equipment, stop all fans, otherwise read electric device interior environment temperature also arranges the initial speed of all fans, and in electronic equipment operational process timing detected electrons equipment, in the time that electronic equipment does not have installation component, stop all fans or be reduced to preset rotation speed.
Said fans control method can be controlled separately one or several fan, also can control all fans simultaneously, can, by each fan of different rotating speeds difference control, greatly reduce the power consumption of electronic equipment.
The control method for fan that the present invention proposes, according to electronic equipment inner assembly quantity, type, combined state and the inside and outside portion of electronic equipment environment temperature, adjusts respectively the rotating speed of fan, realizes the energy-conservation of electronic equipment.
With reference to Fig. 7, an embodiment of fan control device 60 of the present invention is proposed, for comprising the electronic equipment of at least two fans, fan control device 60 is connected with fan, comprises CPU21 and logic control circuit 11,
Wherein, CPU21, for according to the heating situation of electronic equipment, arranges respectively the rotating speed control data of fan;
Logic control circuit 11, for according to the rotating speed control data of fan, is adjusted the rotating speed of fan.
Above-mentioned CPU21 comprises:
Daughter card module 212, for arranging respectively the rotating speed of fan according to subcard type; And/or,
Line card module 213, for arranging respectively the rotating speed of fan according to the various combination of light mouth line card and electricity mouthful line card; And/or,
Assembly module 214, for arranging respectively the rotating speed of fan according to the various combination of line card and power supply; And/or,
Thermal module 215, for arranging respectively the rotating speed of fan according to environment temperature.
Above-mentioned logic control circuit 11 comprises:
Control signal module 111, for being converted into pulse-width signal by the rotating speed control data of fan;
Speed adjusting module 112, to fan, adjusts the rotating speed of fan for output pulse width modulation signal.
The present invention also proposes the another embodiment of fan control device 60, and in the embodiment shown in fig. 7, CPU21 also comprises:
Detection module 211, in the time that electronic equipment does not have installation component, stops all fans or is reduced to preset rotation speed, and said modules comprises main control card, line card and power supply, and main control card can comprise subcard.
Initialization module 210, in the time that electronic equipment does not have installation component, stops all fans, otherwise read electric device interior environment temperature the initial speed of all fans is set, said modules comprises main control card, line card and power supply, main control card can comprise subcard.
Describe the principle of work of fan control device 60 of the present invention below in detail.
Fig. 4 is the front view of electronic equipment, generally includes the fan group 12 of several fan compositions and the assembly of several equipment, and assembly comprises power supply 13, main control card and line card etc., and main control card can comprise subcard, and assembly is positioned in draw-in groove.Wherein, the thermal value of 1 power supply is about 4 times of 1 line card, and the rotating speed that the assembly module 214 in fan control device 60 arranges respectively each fan according to the various combination of line card and power supply is as shown in table 1:
Table 1
Rotation speed of the fan gear in above table is multiplied by the current rotating speed of each fan, obtains the rotating speed that in electronic equipment, each fan should be adjusted, the current rotating speed of each fan may be identical may be not identical yet.
Vertical view when Fig. 5 is the installation line card of electronic equipment, two draw-in groove A141 of electronic device shell inside and draw-in groove B142 can install light mouth line card or electricity mouthful line card, the main heater members of light mouth line card is in line card front portion, comprise that taking electronic equipment 3 fans are as example, in fan group, being positioned at anterior fan C123 is its heat radiation main fan, the main heater members of electricity mouthful line card is at line card postmedian, and the fan A121 and the fan B122 that in fan group, are positioned at postmedian are its heat radiation main fans.The rotating speed that line card module 213 in fan control device 60 arranges respectively each fan according to the various combination of light mouth line card and electrical equipment line card is as shown in table 2:
Table 2
According to the various combination of electricity mouthful line card and light mouth line card in above table, fan A121, fan B122 and the current rotating speed of fan C123 are multiplied by respectively to corresponding percentage, obtain the rotating speed of each fan that should adjust.
Figure 6 shows that the vertical view of electronic equipment in the time that main control card is installed, main control card in electronic equipment and subcard can select to install the assembly of different model, when the assembly of different model is installed, the model differences such as its CPU comprising, exchange chip, physical chip, thermal value is also different.The different assemblies such as gigabit light openning card, gigabit electricity openning card or 10,000,000,000 smooth openning cards can be selected to install in such as subcard position, gigabit light openning card is not with physical chip, gigabit electricity openning card and 10,000,000,000 smooth openning cassette tapes have physical chip, and the physical chip thermal value of 10,000,000,000 smooth openning cards is higher than the physical chip thermal value of gigabit electricity openning card.The rotating speed that daughter card module 212 in fan control device 60 arranges respectively each fan according to subcard type is as shown in table 3:
Table 3
According to position relationship, subcard type major effect fan C123 rotating speed, can only adjust the rotating speed of fan C123 according to subcard type cases, according to the number of fans of installing in electronic equipment, on the position of fan C123, one or more fans can be installed, according to position relationship, the rotating speed of these fans all can be subject to the impact of subcard type.
It should be noted that table 1 arranges when the electronic equipment initialization to the rotation speed of the fan gear described in table 3, and can adjust according to different actual needs.
Can mounting temperature sensor 40 at electronic equipment air intake vent and air outlet, be connected to fan control device 60 by I2C bus, the air themperature that reads air intake vent by thermal module 215 timings in fan control device 60 is as electronic device exterior environment temperature, and the air themperature that fan control device 60 timings read out air port is as electronic equipment internal environment temperature.In the time detecting ambient temperature higher than 65 DEG C, force all fans on original rotating speed basis, improving 20% of each fan greatest physical rotating speed separately, in the time detecting ambient temperature higher than 50 DEG C, force all fans on original rotating speed basis, to improve 10% of each fan greatest physical rotating speed.In the time detecting interior environment temperature higher than 65 DEG C, force all fans on original rotating speed basis, improving 10% of each fan greatest physical rotating speed separately.It should be noted that above-mentioned related " 65 DEG C " and " 50 DEG C " temperature parameter can be configured by the user of electronic equipment, to adapt to country variant and regional user's demand.
The data that assembly 50 situations in the fan control device 60 timing detected electrons equipment of electronic equipment and temperature sensor 40 are beamed back, according to the rotating speed of above four combined factors adjustment fan.
The adjustment of above-mentioned all rotation speeds of the fan all realizes based on fan control device 60, for each fan in fan group, in logic control circuit 11 for it distributes one group of register, every group of register is only responsible for arranging the rotating speed of this fan, CPU21 is by this group register of steering logic control circuit 11, trigger the logical process of logic control circuit 11, adjust separately the rotating speed of this fan.
First, CPU21 arranges respectively the rotating speed control data of each fan, and above-mentioned data are exported in the register of each fan of correspondence of control signal module 111, secondly, rotating speed control data are converted into pulse-width signal by speed adjusting module 112, export pulse-width signal to each fan, reach the object of adjusting rotation speed of the fan.
In the time that electronic equipment starts, when initialization module 210 does not have installation component as detected electrons equipment, stop all fans, otherwise read electric device interior environment temperature also arranges the initial speed of all fans, and detection module 211, in electronic equipment operational process, timing detected electrons equipment, in the time that electronic equipment does not have installation component, stops all fans or is reduced to preset rotation speed.
Fan control device 60 can be controlled separately one or several fan, also can control all fans simultaneously, can, by each fan of different rotating speeds difference control, greatly reduce the power consumption of electronic equipment.
The fan control device 60 that the present invention proposes, according to electronic equipment inner assembly quantity, type, combined state and the inside and outside portion of electronic equipment environment temperature, adjusts respectively the rotating speed of fan, realizes the energy-conservation of electronic equipment.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (8)

1. a control method for fan, for comprising the electronic equipment of at least two fans, is characterized in that, comprises step:
According to the heating situation of described electronic equipment, the rotating speed control data of described fan are set respectively;
According to the rotating speed control data of described fan, adjust the rotating speed of described fan;
Described according to the heating situation of electronic equipment, the rotating speed control data that fan is set respectively specifically comprise:
The rotating speed of described fan is set respectively, the rotating speed of described fan is set respectively, the rotating speed of described fan is set respectively and/or the rotating speed of described fan is set respectively according to environment temperature according to the various combination of line card and power supply according to the various combination of light mouth line card and electricity mouthful line card according to subcard type.
2. control method for fan as claimed in claim 1, is characterized in that, described according to the rotating speed control data of fan, and the rotating speed of adjusting fan specifically comprises:
The rotating speed control data of described fan are converted into pulse-width signal;
Export described pulse-width signal to described fan, adjust the rotating speed of described fan.
3. control method for fan as claimed in claim 1, is characterized in that, according to the heating situation of described electronic equipment, the rotating speed control data that fan is set respectively further comprise:
In the time that described electronic equipment does not have installation component, stop all fans or be reduced to preset rotation speed, described assembly comprises main control card, line card and power supply.
4. control method for fan as claimed in claim 1 or 2, is characterized in that, described according to the heating situation of electronic equipment, before the rotating speed control data of fan are set respectively, also comprises step:
In the time that described electronic equipment does not have installation component, stop all fans, otherwise read electric device interior environment temperature the initial speed of all fans is set, described assembly comprises main control card, line card and power supply.
5. a fan control device, for comprising the electronic equipment of at least two fans, described fan control device is connected with described fan, it is characterized in that, comprises CPU and logic control circuit,
Described CPU, for according to the heating situation of described electronic equipment, arranges respectively the rotating speed control data of described fan;
Described logic control circuit, for according to the rotating speed control data of described fan, adjusts the rotating speed of described fan;
Described CPU comprises:
Daughter card module, for arranging respectively the rotating speed of described fan according to subcard type; And/or,
Line card module, for arranging respectively the rotating speed of described fan according to the various combination of light mouth line card and electricity mouthful line card; And/or,
Assembly module, for arranging respectively the rotating speed of described fan according to the various combination of line card and power supply; And/or,
Thermal module, for arranging respectively the rotating speed of described fan according to environment temperature.
6. fan control device as claimed in claim 5, is characterized in that, described logic control circuit comprises: control signal module, for the rotating speed control data of described fan are converted into pulse-width signal; Speed adjusting module, for exporting described pulse-width signal to described fan, adjusts the rotating speed of described fan.
7. fan control device as claimed in claim 6, is characterized in that, described CPU also comprises detection module, in the time that described electronic equipment does not have installation component, stops all fans or is reduced to preset rotation speed, and described assembly comprises main control card, line card and power supply.
8. the fan control device as described in claim 6 or 7, it is characterized in that, described CPU also comprises initialization module, for in the time that described electronic equipment does not have installation component, stop all fans, otherwise read electric device interior environment temperature also arranges the initial speed of all fans, and described assembly comprises main control card, line card and power supply.
CN201010209115.3A 2010-06-24 2010-06-24 Fan control method and device Active CN101858357B (en)

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