CN100397295C - Method and circuit for controlling radiator - Google Patents
Method and circuit for controlling radiator Download PDFInfo
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- CN100397295C CN100397295C CNB200510035726XA CN200510035726A CN100397295C CN 100397295 C CN100397295 C CN 100397295C CN B200510035726X A CNB200510035726X A CN B200510035726XA CN 200510035726 A CN200510035726 A CN 200510035726A CN 100397295 C CN100397295 C CN 100397295C
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Abstract
A method for controlling heat radiation device includes outputting a control signal by rotating speed control unit, coupling redundant circuit between said control unit and heat radiation device for receiving control signal and for outputting multiple driving signal to those heat radiation units according to said control signal as well as for receiving the rotating speed signal fedback from each heat radiation unit for monitoring operation state of those heat radiation units in real time.
Description
Technical field
The invention relates to a kind of control method and circuit of heat abstractor, and particularly relevant for a kind of control method and circuit that can a plurality of heat abstractors of synchronous coordination.
Background technology
Along with the advancing by leaps and bounds of computer technology, make the running speed of computer constantly improve in recent years, and the heating power of the electronic package of host computer inside is also constantly soaring thereupon.Overheated for the electronic package that prevents host computer inside, and cause electronic package that temporary or nonvolatil inefficacy takes place, be important topic in the product design so how the enough heat dissipations of the electronic package of host computer inside are provided.With industrial slim computer is example, and it forms cooling systems with a plurality of fans usually, in order to removing the heat energy that electronic package is produced when the working at high speed rapidly, and then reduces the temperature of electronic package itself, so that the running of host computer can be more smooth and easy.
In above-mentioned industrial slim computer, all fans of its cooling system are full-speed operation, to improve the heat dissipation of system.Yet in traditional cooling system, only when main fan fails (fail), cooling system just can give a warning, and other fan fails can not sent any warning.In other words, the cooling system in the slim computer of traditional industry only can return the operating condition of main fan, even other fan lost efficacy, cooling system still continues running.But in fact, when one of them lost efficacy when these fans, the load of other fan will be risen, and then caused the heat dissipation of cooling system integral body to descend.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of heat abstractor control circuit exactly, is suitable for coupling and controls a plurality of heat abstractors, so that these heat abstractors can have been given play to best heat dissipation.
For achieving the above object, heat abstractor control circuit of the present invention comprises: a rotary speed controling unit is suitable for exporting a control signal; An and redundant circuit, be coupled between this rotary speed controling unit and those heat abstractors, in order to receiving this control signal, and this redundant circuit is suitable for exporting the plurality of drive signal to those heat abstractors according to this control signal, and receives a respectively rotating speed feedback signal of this heat abstractor.Described redundant circuit is made of signal processing unit, status signal generator and mode initialization unit.Wherein, signal processing unit is in order to exporting above-mentioned drive signal and to receive above-mentioned rotating speed feedback signal, and exports a control feedback signal to rotary speed controling unit according to these rotating speed feedback signals.The status signal generator then is coupled to signal processing unit, the control feedback signal of being exported in order to the received signal processing unit, and according to this control feedback signal and export a status signal.The mode initialization unit is coupled to redundant circuit, and in order to setting a mode of operation, so that mode of operation that redundant circuit sets according to the mode initialization unit and the rotating speed feedback signal that received and export the control feedback signal.
In one example, status signal for example is digital signal or simulating signal.
In preferred embodiment of the present invention, above-mentioned redundant circuit also comprises a multiplexer switch (multiplexer switch), optionally one of them is coupled to signal processing unit at least with these heat abstractors for it, exports signal processing unit in order to the rotating speed feedback signal with its heat abstractor that couples.
In preferred embodiment of the present invention, signal processing unit is made of driving signal generator and comparer.Wherein, above-mentioned drive signal promptly is to produce by driving signal generator.Comparer then is coupled to driving signal generator and heat abstractor, in order to receiving and the relatively drive signal and the rotating speed feedback signal of each heat abstractor, and exports above-mentioned control feedback signal according to comparative result.
In addition, these heat abstractors for example are fans.
Another object of the present invention provides a kind of control method of heat abstractor, is suitable for controlling a plurality of heat abstractors, and this control method can be adjusted the operating condition of each heat abstractor according to the feedback signal that each heat abstractor returned.
For reaching above-mentioned another purpose, the control method of heat abstractor of the present invention comprises: export a control signal; This control signal is converted to the plurality of drive signal, to drive those heat abstractors; And receive the rotating speed feedback signal that this heat abstractor is respectively exported.Above-mentioned control method comprises that also producing and export one according to each rotating speed feedback signal controls feedback signal.And above-mentioned control method also comprises and set a mode of operation earlier, and drive signal and control feedback signal promptly is to produce according to this mode of operation before control signal is converted to drive signal.
In one example, this control method also comprises according to each control feedback signal and export a status signal.Wherein, status signal is digital signal or simulating signal.
In preferred embodiment of the present invention, above-mentioned control method comprises that also drive signal and the rotating speed feedback signal to each heat abstractor compares, and exports above-mentioned control feedback signal according to comparative result before output control feedback signal.
From the above, this mode of operation is a redundant mode, and under this redundant mode, if learnt the heat abstractor of part lost efficacy by the rotating speed feedback signal, and when the quantity of these inefficacy heat abstractors surpassed a default value, rotary speed controling unit stopped the running of these heat abstractors according to the control feedback signal.In another embodiment, this mode of operation for example is a general pattern, and under this general modfel, if when learning these heat abstractors one of them had lost efficacy at least by these rotating speed feedback signals, rotary speed controling unit stops the running of these heat abstractors according to the control feedback signal.In addition, this mode of operation can also be one man-hour shared model.Wherein, under this shared model in man-hour, these drive signals make the running in turn of these heat abstractors, and when learning these heat abstractors by these rotating speed feedback signals one of them lost efficacy at least, rotary speed controling unit is exported next control signal according to these control feedback signals, driving all heat abstractors, and then lost efficacy the heat sinking function of heat abstractor of compensation.
Whether the present invention can control a plurality of heat abstractors simultaneously, and returns the operating condition of each heat abstractor, run well so that monitor these heat abstractors in real time.
The present invention is above-mentioned to be become apparent with other purpose, feature and advantage in order to allow, and preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 illustrates the control method flow chart of steps into heat abstractor in one embodiment of the invention.
Fig. 2 illustrates the block schematic diagram into heat abstractor control circuit in the first embodiment of the invention.
Fig. 3 illustrates the block schematic diagram into heat abstractor control circuit in the second embodiment of the invention.
Fig. 4 illustrates the block schematic diagram into heat abstractor control circuit in the third embodiment of the invention.
Fig. 5 illustrates the block schematic diagram into heat abstractor control circuit in the fourth embodiment of the invention.
Embodiment
Fig. 1 illustrates the control method flow chart of steps into heat abstractor in one embodiment of the invention.Please refer to Fig. 1, the control method of heat abstractor of the present invention is mainly in order to controlling the running of a plurality of heat abstractors, and this control method is output one control signal earlier, as described in step S100.Then, in step S104, this control signal is converted to the drive signal of heat abstractor, and output drive signal is to drive these heat abstractors respectively.Specifically, in a preferred embodiment, this control method is before control signal is converted to the drive signal of heat abstractor, set a mode of operation earlier, as described in step S102, and promptly be control signal to be converted to drive signal in step S104 according to the mode of operation that sets among the step S102.Follow-uply will illustrate the mode of operation that sets among the step S102.
Please continue with reference to Fig. 1, after driving heat abstractor, heat abstractor will the output speed feedback signal, and can receive the rotating speed feedback signal of these heat abstractors this moment by an electronic package, as described in step S106.Then, export a control feedback signal according to these rotating speed feedback signals, as described in step S108.Can carry out step S110 afterwards, just adjust the operating condition of each heat abstractor, so that these heat abstractors reach best integral heat sink usefulness according to this control feedback signal.Specifically, in this preferred embodiment, also can export a status signal SS according to the control feedback signal simultaneously among the step S110, be beneficial to the operating condition that the related personnel monitors each heat abstractor at any time.Wherein, status signal SS for example is a digital signal, therefore when status signal SS exported a host computer (not illustrating) to, host computer can be stored in status signal SS wherein according to user's setting, or status signal SS is exported in the mode of image, literal or sound.Certainly, status signal SS can be a simulating signal also, and the present invention is not limited it.
Hence one can see that, in the present invention, the control feedback signal that step S108 exported is except can directly being back to system, so that system adjusts beyond the operating condition of each heat abstractor automatically, also can make system export the operating condition that a status signal is informed each heat abstractor of related personnel, to adjust its operating condition by the related personnel.
In addition, in a preferred embodiment of the present invention, can also earlier the drive signal and the rotating speed feedback signal of each heat abstractor be made comparisons, as described in step S107 in output control feedback signal (seeing step S108) before.Again in step S108, export the control feedback signal afterwards according to the comparative result that is produced in the step 107.
It should be noted that the control feedback signal exported in step S108 except relevant with the rotating speed feedback signal of heat abstractor, it is also relevant with the mode of operation that sets in the step 102.For instance, if be redundant mode (redundant mode) with Working mode set in step S102, then the drive signal of being exported among the step S104 is to make all heat abstractors turn round simultaneously.Afterwards, the rotating speed feedback signal that is received in step S106 shows a part of heat abstractor and lost efficacy, and the heat abstractor quantity that lost efficacy is less than a default value, the control feedback signal military order step S110 output of then being exported among the step S108 is in order to the control signal of the rotating speed of raising efficiently radiates heat device, to compensate the heat dissipation that lost efficacy and reduced because of the part heat abstractor.Otherwise greater than default value, the control feedback signal military order step S110 that is then exported among the step S108 exports the control signal in order to the running that stops all heat abstractors as if the heat abstractor quantity that lost efficacy.
In addition, if the mode of operation that sets in the step 102 is a general modfel, then the drive signal of being exported among the step S104 is to make all heat abstractors turn round simultaneously.And when the rotating speed feedback signal demonstration that is received among the step S106 had at least a heat abstractor to lose efficacy, the control feedback signal military order step S110 that is exported among the step S108 exported the control signal in order to the running that stops all heat abstractors.
In addition, if the mode of operation that sets in the step 102 is a shared model in man-hour (time sharingmode), then the drive signal of being exported among the step S104 is to make the running in turn of these heat abstractors.And, when the rotating speed feedback signal demonstration that is received among the step S106 has at least a heat abstractor to lose efficacy, the control feedback signal military order step S110 output of being exported among the step S108 can drive the control signal of all effective heat abstractors simultaneously, to compensate the heat dissipation that lost efficacy and reduced because of the part heat abstractor.
From the above, the present invention can be learnt the operating condition of each heat abstractor by the rotating speed feedback signal that each heat abstractor returned, so that the operating condition of these heat abstractors is done suitable adjustment, so that these heat abstractors can reach best heat dissipation.Have the knack of this operator and understand the present invention more for making, below will can be in order to carrying out the control circuit of above-mentioned control method for the embodiment explanation, but it is not in order to limit the present invention.
Fig. 2 illustrates the block schematic diagram into heat abstractor control circuit in the first embodiment of the invention.Please refer to Fig. 2, heat abstractor control circuit 200 is coupled to a plurality of heat abstractors 202, and it mainly is made of rotary speed controling unit 210 and redundant circuit 220.Wherein, rotary speed controling unit 210 is coupled to redundant circuit 220, in order to export a control signal CS to redundant circuit 220.220 of redundant circuits are to be coupled between rotary speed controling unit 210 and the heat abstractor 202, in order to receiving the control signal CS that rotary speed controling unit 210 is exported, and according to control signal CS respectively output drive signal DS to heat abstractor 202.It should be noted that, though in Fig. 2, each drive signal DS is all in order to single heat abstractor 202, in other embodiments of the invention, each drive signal DS also can be in order to controlling a pack heat dissipation device 202 simultaneously, and the present invention is not limited it.In addition, these heat abstractors 202 for example are fans.
Please continue with reference to Fig. 2, each heat abstractor 202 all can be exported its rotating speed feedback signal RFS to redundant circuit 220, returns a control feedback signal CFS according to these rotating speed feedback signal RFS to rotary speed controling unit 210 by redundant circuit 220 again.Therefore, rotary speed controling unit 210 can be adjusted the operating condition of each heat abstractor 202 according to control feedback signal CFS.For instance, in the present embodiment, redundant circuit 220 is made of signal processing unit 222 and status signal generator 228.Wherein, signal processing unit 222 is in order to producing and output drive signal DS, and receives the rotating speed feedback signal RFS that heat abstractor 202 is exported, and exports control feedback signal CFS to rotary speed controling unit 210 according to rotating speed feedback signal RFS that it received.228 of status signal generators are coupled to signal processing unit 222, the control feedback signal CFS that is exported in order to received signal processing unit 222, and according to control feedback signal CFS that it received and export a status signal SS.At this, status signal SS for example is a digital signal, and it can be to export in the mode of signal of video signal or voice signal, can certainly be to export in the mode of video-audio signal, so that inform the operating condition of the some or all heat abstractors 202 of related personnel, and then make the related personnel do suitable processing according to the operating condition of heat abstractor 202.
Fig. 3 illustrates the block schematic diagram into heat abstractor control circuit in the second embodiment of the invention.Please refer to Fig. 3, in an embodiment of the present invention, can control the operating condition of each heat abstractor 202 respectively in order to make heat abstractor control circuit 200 of the present invention, it is optionally at least one heat abstractor 202 to be coupled to signal processing unit 222 by a multiplexer switch 221, so that the rotating speed feedback signal RFS of the heat abstractor 202 that multiplexer switch 221 is coupled may be output to signal processing unit 222.Afterwards, signal processing unit 222 can be exported control feedback signal CFS according to its received rotating speed feedback signal RFS to rotary speed controling unit 210 and status signal generator 228.
Hence one can see that, heat abstractor control circuit 200 of the present invention can be controlled a plurality of heat abstractors 202 simultaneously, and the present invention can be learnt the operating condition of each heat abstractor 202 by the rotating speed feedback signal RFS that each heat abstractor 202 is returned, and then adjust the operating condition of each heat abstractor 202, to improve the integral heat sink usefulness of these heat abstractors 202.
In addition, in a preferred embodiment, heat abstractor control circuit 200 of the present invention also comprises a mode initialization unit 230, as shown in Figure 4, it is coupled to redundant circuit 220, in order to setting the mode of operation of redundant circuit 220, redundant circuit 220 will be according to its mode of operation output drive signal DS and control feedback signal CFS.
For instance, when mode initialization unit 230 was redundant mode with the Working mode set of redundant circuit 220, the drive signal DS that redundant circuit 220 is exported made all heat abstractors 202 turn round simultaneously.Afterwards, if the heat abstractor 202 of learning some for the rotating speed feedback signal RFS of rotary speed controling unit 210 by these passbacks lost efficacy, and heat abstractor 202 quantity that lost efficacy are less than a default value, then redundant circuit 220 will be exported a control feedback signal CFS to rotary speed controling unit 210, rotary speed controling unit 210 will be controlled feedback signal CFS and export another control signal according to this, to compensate the heat dissipation that lost efficacy and reduced because of part heat abstractor 202 by the rotating speed that improves remaining efficiently radiates heat device 202.
Otherwise, if heat abstractor 202 quantity that lost efficacy are greater than default value, then redundant circuit 220 will be exported control feedback signal CFS to rotary speed controling unit 210, so that rotary speed controling unit 210 is exported another control signal according to control feedback signal CFS, to stop the running of all heat abstractors 202.Status signal generator 228 will be exported a status signal SS at this moment, change failed heat abstractor 202 to notify the related personnel, avoid the electronic package of desire heat radiation to produce unexpected start because of rate of heat dissipation reduces.
In addition, mode initialization unit 230 can be general modfel with the Working mode set of redundant circuit 220 also.Under general modfel, the drive signal DS that redundant circuit 220 is exported makes all heat abstractors 202 turn round simultaneously.Afterwards, if learn for the rotating speed feedback signal RFS of rotary speed controling unit 210 by these passbacks, have at least a heat abstractor 202 to lose efficacy, then redundant circuit 220 will be exported control feedback signal CFS to rotary speed controling unit 210, so that rotary speed controling unit 210 stops the running of all heat abstractors 202 according to control feedback signal CFS.
In addition, mode initialization unit 230 can also be shared model in man-hour (time sharing mode) with the Working mode set of redundant circuit 220.Under the man-hour shared model, the drive signal DS system that redundant circuit 220 is exported makes these heat abstractors 202 runnings in turn.Yet, in case redundant circuit 220 received rotating speed feedback signal RFS show when having at least a heat abstractor 202 to lose efficacy, redundant circuit 220 will be exported control feedback signal CFS to rotary speed controling unit 210, and rotary speed controling unit 210 is exported next control signal according to control feedback signal CFS, so that redundant circuit 220 drives all effective heat abstractors 202.
In addition, the present invention can also be in the heat abstractor control circuit otherwise circuit arrangement reach above-mentioned effect, below will be, but it is not in order to limit the present invention for the embodiment explanation.And the identical person of assembly of the assembly of following examples and first embodiment all shows with identical assembly label in graphic, and is special in this explanation.
Fig. 5 illustrates the block schematic diagram into heat abstractor control circuit in the fourth embodiment of the invention.Please refer to Fig. 5, signal processing unit 222 is made of driving signal generator 224 and comparer 226.Wherein, driving signal generator 224 is in order to produce drive signal DS, comparer 226 then is coupled to driving signal generator 224 and heat abstractor 202, in order to receive and to compare the drive signal DS and the rotating speed feedback signal RFS of each heat abstractor 202, and export control feedback signal CFS according to comparative result to status signal generator 228 and rotary speed controling unit 210, be beneficial to the operating condition that rotary speed controling unit 210 next control signal of output are adjusted heat abstractor 202.Writ attitude signal generator 228 output status signal SS then on the other hand are to inform the operating condition of related personnel's heat abstractor 202.
Whether in sum, the present invention can control a plurality of heat abstractors simultaneously, and returns the operating condition of each heat abstractor, run well so that monitor these heat abstractors in real time.And, when the operating condition of part heat abstractor is undesired, control circuit of the present invention can be adjusted other still operating condition of the heat abstractor of normal operation automatically, so that integral heat sink usefulness still maintains in the permissible scope, and send alarm signal and do suitable processing to notify the related personnel.Therefore, with conventional art in comparison, the present invention comparatively coordinated mode controls heat abstractor, and then makes the best heat dissipation of heat abstractor performance.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this operator, do not breaking away from the spirit and scope of the invention; when can doing a little change and retouching, so the present invention's protection domain attached claims person of defining after looking is as the criterion.
Claims (12)
1. a heat abstractor control circuit is coupled to most heat abstractors, it is characterized in that this heat abstractor control circuit comprises:
One rotary speed controling unit is suitable for exporting a control signal;
One redundant circuit, be coupled between this rotary speed controling unit and those heat abstractors, in order to receive this control signal, and this redundant circuit is suitable for exporting the plurality of drive signal to those heat abstractors according to this control signal, and receive a respectively rotating speed feedback signal of this heat abstractor, and this redundant circuit comprises:
One signal processing unit is suitable for exporting those drive signals and receives those rotating speed feedback signals, and exports a control feedback signal to this rotary speed controling unit according to this rotating speed feedback signal respectively; And
One status signal generator is coupled to this signal processing unit, is suitable for receiving those control feedback signals, and export according to this control feedback signal respectively a status signal and
One mode initialization unit is coupled to this redundant circuit, and this mode initialization unit is suitable for setting a mode of operation, so that this redundant circuit is exported those drive signals and those control feedback signals according to this mode of operation.
2. heat abstractor control circuit according to claim 1, it is characterized in that: respectively this status signal is a digital signal.
3. heat abstractor control circuit according to claim 1, it is characterized in that: this redundant circuit also comprises a multiplexer switch, optionally one of them is coupled to this signal processing unit at least with those heat abstractors for it, is suitable for exporting this rotating speed feedback signal of this heat abstractor respectively to this signal processing unit.
4. heat abstractor control circuit according to claim 1 is characterized in that this signal processing unit comprises:
One driving signal generator is suitable for producing those drive signals; And
One comparer is coupled to this driving signal generator and those heat abstractors, be suitable for receiving and respectively this drive signal and this rotating speed feedback signal of this heat abstractor, and export according to comparative result those corresponding control feedback signals one of them.
5. heat abstractor control circuit according to claim 1, it is characterized in that: those heat abstractors are fan.
6. the control method of a heat abstractor is suitable for controlling the running of most heat abstractors, it is characterized in that the control method of this heat abstractor comprises:
Export a control signal;
This control signal is converted to the plurality of drive signal, to drive those heat abstractors;
Receive the rotating speed feedback signal that this heat abstractor is respectively exported; And
Produce and export a control feedback signal according to this rotating speed feedback signal respectively, and before this control signal is converted to those drive signals, comprise that also setting a mode of operation ， And and those drive signals and those control feedback signals produces according to this mode of operation.
7. as the control method of heat abstractor as described in the claim 6, it is characterized in that: also comprise according to this control feedback signal respectively and export a status signal.
8. as the control method of heat abstractor as described in the claim 7, it is characterized in that: respectively this status signal is a digital signal.
9. as the control method of heat abstractor as described in the claim 6, it is characterized in that: before those control feedback signals of output, also comprise respectively this drive signal and this rotating speed feedback signal of this heat abstractor are compared, and export according to comparative result those corresponding control feedback signals one of them.
10. as the control method of heat abstractor as described in the claim 6, it is characterized in that: this mode of operation comprises a redundant mode, and under this redundant mode, if learnt those heat abstractors of part lost efficacy by those rotating speed feedback signals, and when the quantity of the heat abstractor of those inefficacies surpassed a default value, this rotary speed controling unit stopped the running of all those heat abstractors according to those control feedback signals.
11. control method as heat abstractor as described in the claim 6, it is characterized in that: this mode of operation comprises general modfel, and under this general modfel, at least one of them lost efficacy if learn those heat abstractors by those rotating speed feedback signals, and this rotary speed controling unit system stops the running of all those heat abstractors according to those control feedback signals.
12. control method as heat abstractor as described in the claim 6, it is characterized in that: this mode of operation comprise one man-hour shared model, and under this shared model in man-hour, those drive signals make the running in turn of those heat abstractors, and when learning those heat abstractors by those rotating speed feedback signals one of them lost efficacy at least, this rotary speed controling unit is exported next control signal according to those control feedback signals, so that effectively those heat abstractors turn round simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510035726XA CN100397295C (en) | 2005-07-11 | 2005-07-11 | Method and circuit for controlling radiator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510035726XA CN100397295C (en) | 2005-07-11 | 2005-07-11 | Method and circuit for controlling radiator |
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| CN1896912A CN1896912A (en) | 2007-01-17 |
| CN100397295C true CN100397295C (en) | 2008-06-25 |
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| CNB200510035726XA Expired - Fee Related CN100397295C (en) | 2005-07-11 | 2005-07-11 | Method and circuit for controlling radiator |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105573369B (en) * | 2014-11-06 | 2018-11-09 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| CN112524062B (en) * | 2019-09-19 | 2022-11-25 | 台达电子工业股份有限公司 | Heat dissipation device with energy-saving effect and control method thereof |
| CN112763805B (en) * | 2019-11-06 | 2023-10-20 | 中强光电股份有限公司 | Heat dissipation device and detection method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6597972B2 (en) * | 2001-02-27 | 2003-07-22 | International Business Machines Corporation | Integrated fan assembly utilizing an embedded fan controller |
| US6657325B2 (en) * | 2001-01-11 | 2003-12-02 | International Business Machines Corporation | Multiple fan sensing circuit and method for monitoring multiple cooling fans utilizing a single fan sense input |
| CN1624662A (en) * | 2004-12-17 | 2005-06-08 | 李谦 | Method of monitoring device on AGP plate and its device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6657325B2 (en) * | 2001-01-11 | 2003-12-02 | International Business Machines Corporation | Multiple fan sensing circuit and method for monitoring multiple cooling fans utilizing a single fan sense input |
| US6597972B2 (en) * | 2001-02-27 | 2003-07-22 | International Business Machines Corporation | Integrated fan assembly utilizing an embedded fan controller |
| CN1624662A (en) * | 2004-12-17 | 2005-06-08 | 李谦 | Method of monitoring device on AGP plate and its device |
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