CN109356875A - A kind of server fan control method, apparatus and system - Google Patents
A kind of server fan control method, apparatus and system Download PDFInfo
- Publication number
- CN109356875A CN109356875A CN201811554581.8A CN201811554581A CN109356875A CN 109356875 A CN109356875 A CN 109356875A CN 201811554581 A CN201811554581 A CN 201811554581A CN 109356875 A CN109356875 A CN 109356875A
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- bmc
- fan
- firmware
- driving signal
- cpld
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001514 detection method Methods 0.000 claims description 8
- 239000004606 Fillers/Extenders Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
Abstract
The invention discloses a kind of server fan control methods, apparatus and system, applied to complex programmable logic device (CPLD), including detect BMC firmware whether failure, if, then the BMC spare driving signal exported is exported to fan, to be controlled according to revolving speed of the spare driving signal to fan.CPLD in the embodiment of the present invention is in the firmware failure for detecting BMC, the signal exported to BMC is only needed to switch over, the BMC spare driving signal exported is exported to fan, to be controlled by the spare driving signal the revolving speed of fan, mechanism and hardware design are simple, the logic gate quantity for reducing CPLD, advantageously reduces product cost.
Description
Technical field
The present embodiments relate to field of computer technology, more particularly to a kind of server fan control method, device
And system.
Background technique
The heat dissipation of usual server is to generate the distinguished and admirable heat for taking away heating device in cabinet by fan to realize.
Currently, the revolving speed of server fan is controlled by BMC firmware, wherein the PWM pin foot of BMC is connected to fan by CPLD
Control terminal establishes heartbeat connection between BMC and CPLD, it is disconnected that heartbeat connection is established when BMC firmware failure, between BMC and CPLD
It opens, needing complicated mechanism and hardware design to realize before BMC restores normal after BMC firmware failure in the prior art will be by
CPLD controls fan.After BMC firmware failure, fan is controlled by CPLD, not only mechanism and hardware design
Complexity, and the usage quantity of CPLD logic gate is larger, can increase the cost of product to a certain extent.
In consideration of it, how to provide it is a kind of solve the server fan control method of above-mentioned technical problem, apparatus and system at
For those skilled in the art's problem to be solved.
Summary of the invention
The purpose of the embodiment of the present invention is that a kind of server fan control method, apparatus and system are provided, in use process
In reduce the logic gate quantity of CPLD, advantageously reduce product cost.
In order to solve the above technical problems, being applied to multiple the embodiment of the invention provides a kind of server fan control method
Miscellaneous programmable logic device (CPLD), comprising:
Detect BMC firmware whether failure, if so, the spare driving signal that the BMC is exported is exported to fan, with
Just the revolving speed of the fan is controlled according to the spare driving signal.
Optionally, further includes:
Detect whether the firmware of the BMC restores normally, if so, the main driving signal that the BMC firmware is exported
Output is to fan, to control according to the main driving signal the revolving speed of the fan.
Optionally, it is described detection BMC firmware whether the process of failure are as follows:
Detect whether the output signal of bus extender GPIO that connect with the BMC from low potential is raised supreme electricity
Position, if so, the firmware failure of the BMC.
Optionally, whether the firmware for detecting the BMC restores normal process are as follows:
Whether the output signal for detecting the bus extender GPIO from high potential is pulled low to low potential, if so, institute
The firmware restoration for stating BMC is normal.
Optionally, the PWM dither signal that the firmware that the main control signal is the BMC exports.
Optionally, the spare driving signal is the timer shake letter for being set to the microcontroller output inside the BMC
Number.
The embodiment of the present invention provides a kind of server fan control device accordingly, is applied to CPLD, comprising:
Detection circuit, for detect BMC firmware whether failure, if so, triggering switching circuit；
The switching circuit, the spare driving signal for exporting the BMC is exported to fan, so as to according to described standby
It is controlled with revolving speed of the driving signal to the fan.
Optionally, the detection circuit, is also used to detect whether the firmware of the BMC restores normally, if so, triggering
The switching circuit；
The switching circuit is also used to export the main driving signal that the BMC firmware exports to fan, so as to according to institute
Main driving signal is stated to control the revolving speed of the fan.
The embodiment of the invention also provides a kind of server fan control systems, including BMC and input terminal with the BMC's
The CPLD that output end connection, output end are used to connect with the control terminal of fan, the CPLD is for executing clothes as described above
The method of business device fan control.
The embodiment of the invention provides a kind of server fan control methods, apparatus and system, are applied to complex programmable
Logic device (CPLD), comprising: detect BMC firmware whether failure, if so, by BMC export spare driving signal export to
Fan, to be controlled according to revolving speed of the spare driving signal to fan.As it can be seen that the CPLD in the embodiment of the present invention is being detected
To BMC firmware failure when, it is only necessary to BMC output signal switch over, by BMC export spare driving signal export to
Fan, to be controlled by the spare driving signal the revolving speed of fan, mechanism and hardware design are simple, reduce
The logic gate quantity of CPLD, advantageously reduces product cost.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of flow diagram of server fan control method provided in an embodiment of the present invention；
Fig. 2 is a kind of electrical block diagram of server fan control system provided in an embodiment of the present invention；
Fig. 3 is a kind of structural block diagram of server fan control device provided in an embodiment of the present invention.
Specific embodiment
The embodiment of the invention provides a kind of server fan control methods, apparatus and system, reduce in use
The logic gate quantity of CPLD, advantageously reduces product cost.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of flow diagram of server fan control method provided in an embodiment of the present invention.
This method is applied to complex programmable logic device (CPLD), can specifically include:
S110: detect BMC firmware whether failure, if so, into S120；
It should be noted that after powering, BMC can export two kinds of control signals to CPLD, one is main driving signal, one
It kind is spare driving signal, wherein in the normal situation of firmware of BMC, BMC can export main driving signal, and
The main driving signal that CPLD default exports BMC when booting is exported to fan, so as to the wind speed using main driving signal to fan
It is controlled.Wherein, the PWM dither signal that the present embodiment Zong Guo winner driving signal can export for the firmware of BMC, spare drive
Dynamic signal can be set to inside BMC microcontroller output timer dither signal, be specifically as follows microcontroller according to
The fluctuation signal of the timer duty output of timer setting.
S120: the BMC spare driving signal exported is exported to fan, to turn according to spare driving signal to fan
Speed is controlled.
Specifically, needing to switch over output signal, exporting when CPLD detects the firmware failure of BMC
Signal switches to spare driving signal by main driving signal, thus controlled using wind speed of the spare driving signal to fan,
In order to avoid fan is rotated with a certain fixed frequency, cause to influence system radiating effect or waste of energy.CPLD in the present embodiment is only
It needs to execute the movement of switching after the firmware failure for detecting BMC, CPLD can be greatly reduced compared with the existing technology
Logic gate usage quantity reduces the consumption of CPLD logic gate, and then reduces cost.
Further, this method can also include:
Detect whether the firmware of BMC restores normally, if so, exporting the main driving signal that BMC firmware exports to wind
Fan, to be controlled according to revolving speed of the main driving signal to fan.
Specifically, can consolidate after the firmware failure of BMC to BMC to preferably control the revolving speed of fan
Part state is measured in real time, and after the firmware restoration of BMC is normal, BMC will normally export main driving signal, so
After the firmware restoration of BMC is normal, output signal is switched to main driving signal by spare driving signal by CPLD, to continue to use
Main driving signal controls the wind speed of fan.
Further, in above-mentioned S110 detect BMC firmware whether the process of failure, be specifically as follows:
Detect whether the output signal of bus extender GPIO that connect with BMC from low potential is pulled to high potential, if
It is, then the firmware failure of BMC.
Specifically, can be set in the GPIO of BMC connection, GPIO is external to draw high resistance, when BMC firmware is normal, GPIO's
Output signal is low potential, and when BMC firmware failure, the output signal current potential of GPIO is drawn high resistance and drawn high as high potential, institute
Can judge that BMC firmware is high potential or low potential according to the current potential situation of GPIO output signal, so that it is determined that BMC out
Whether firmware breaks down.
Further, whether the above-mentioned firmware for detecting BMC restores normal process, is specifically as follows:
Whether the output signal for detecting bus extender GPIO from high potential is pulled low to low potential, if so, BMC's consolidates
Part restores normal.
That is, detecting that the output signal of GPIO is restored by high potential to low potential in CPLD, then illustrate that the firmware of BMC is extensive
It is multiple normal, so the control signal of fan can be switched to the main driving signal that BMC firmware exports at this time, and by the main driving
Signal is exported to fan.
It should also be noted that, the microcontroller of BMC itself includes timer pin, it is mainly used in array setting time
After inverse, externally the signal of output variation, part timer pin support automatic cycle is arranged can export duty to reach
Than (duty cycle), therefore the circuit diagram of one of the application specific embodiment can be as shown in Figure 2, in which:
The first output end of BMC is connected by the first input end of timer pin and CPLD, and the second output terminal of BMC is logical
The second input terminal connection of PWM pin and CPLD are crossed, the output end of CPLD and the control terminal of fan connect, and the third end of BMC is logical
GPIO is crossed to connect with the test side CPLD.Wherein, timer pin is for the microcontroller in BMC according to preset timer
The duty signal of duty output；PWM pin controls rotation speed of the fan for BMC firmware.
Wherein, timer pin is used for when the firmware of BMC is out of order and is unable to control fan, and CPLD is by the microcontroller in BMC
The control terminal to fan for the duty signal output that device is exported according to preset timer duty, with the wind speed to fan into
Row control；PWM pin controls rotation speed of the fan for BMC firmware.After host booting, CPLD default exports the firmware in BMC
Pwm signal export to the control terminal of fan, PWM pin is also switched to fan control end, when the firmware for detecting BMC goes out
After failure, timer pin is switched to fan control end, to exporting the driving signal that the microcontroller of BMC exports to wind
The control terminal of fan.
The embodiment of the invention provides a kind of server fan control methods, are applied to Complex Programmable Logic Devices
CPLD, comprising: detect BMC firmware whether failure, if so, by BMC export spare driving signal export to fan, so as to
It is controlled according to revolving speed of the spare driving signal to fan.As it can be seen that the CPLD in the embodiment of the present invention is detecting consolidating for BMC
When part failure, it is only necessary to the signal of BMC output is switched over, the BMC spare driving signal exported is exported to fan,
To be controlled by the spare driving signal the revolving speed of fan, mechanism and hardware design are simple, reduce patrolling for CPLD
Lock quantity is collected, product cost is advantageously reduced.
On the basis of the above embodiments, the embodiment of the present invention provides a kind of server fan control device accordingly,
Applied to CPLD, specifically referring to figure 3..The apparatus may include:
Detection circuit 31, for detect BMC firmware whether failure, if so, triggering switching circuit 32；
Switching circuit 32, the spare driving signal for exporting BMC is exported to fan, so as to according to spare driving signal
The revolving speed of fan is controlled.
Optionally, detection circuit 31, are also used to detect whether the firmware of BMC restores normally, if so, triggering switching electricity
Road 32；
Switching circuit 32, the main driving signal for being also used to export in BMC firmware are exported to fan, to believe according to main driving
Number the revolving speed of fan is controlled.
It should be noted that server fan control device provided in the present embodiment has and institute in above-described embodiment
The identical beneficial effect of server fan control method of offer controls server fan involved in this present embodiment
The specific introduction of method please refers to above-described embodiment, and details are not described herein by the application.
On the basis of the above embodiments, the embodiment of the invention also provides a kind of server fan control systems, including
The CPLD that the connection of the output end of BMC and input terminal and BMC, output end are used to connect with the control terminal of fan, CPLD is for executing
The method controlled such as above-mentioned server fan.
It should be noted that the embodiment of the present invention has and server fan control method provided in above-described embodiment
Identical beneficial effect please refers to the specific introduction of server fan control method involved in this present embodiment above-mentioned
Embodiment, details are not described herein by the application.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of server fan control method is applied to complex programmable logic device (CPLD) characterized by comprising
Detect BMC firmware whether failure, if so, the spare driving signal that the BMC is exported is exported to fan, so as to according to
The revolving speed of the fan is controlled according to the spare driving signal.
2. server fan control method according to claim 1, which is characterized in that further include:
Detect whether the firmware of the BMC restores normally, if so, the main driving signal of BMC firmware output is exported
To fan, to control according to the main driving signal the revolving speed of the fan.
3. server fan control method according to claim 2, which is characterized in that whether the firmware of the detection BMC
The process of failure are as follows:
Detect whether the output signal of bus extender GPIO that connect with the BMC from low potential is pulled to high potential, if
It is, then the firmware failure of the BMC.
4. server fan control method according to claim 3, which is characterized in that described to detect consolidating for the BMC
Whether part restores normal process are as follows:
Whether the output signal for detecting the bus extender GPIO from high potential is pulled low to low potential, if so, the BMC
Firmware restoration it is normal.
5. server fan control method according to any one of claims 1-4, which is characterized in that the main control letter
Number for the BMC firmware export PWM dither signal.
6. server fan control method according to claim 5, which is characterized in that the spare driving signal is setting
The timer dither signal of microcontroller output inside the BMC.
7. a kind of server fan control device is applied to CPLD characterized by comprising
Detection circuit, for detect BMC firmware whether failure, if so, triggering switching circuit；
The switching circuit, the spare driving signal for exporting the BMC are exported to fan, so as to according to the spare drive
Dynamic signal controls the revolving speed of the fan.
8. server fan control device according to claim 7, which is characterized in that
The detection circuit, is also used to detect whether the firmware of the BMC restores normally, if so, the triggering switching electricity
Road；
The switching circuit is also used to export the main driving signal that the BMC firmware exports to fan, so as to according to the master
Driving signal controls the revolving speed of the fan.
9. a kind of server fan control system, which is characterized in that connect including BMC and input terminal with the output end of the BMC,
Output end is used for the CPLD connecting with the control terminal of fan, and the CPLD is as claimed in any one of claims 1 to 6 for executing
Server fan control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811554581.8A CN109356875B (en) | 2018-12-18 | 2018-12-18 | Server fan control method, device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811554581.8A CN109356875B (en) | 2018-12-18 | 2018-12-18 | Server fan control method, device and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109356875A true CN109356875A (en) | 2019-02-19 |
| CN109356875B CN109356875B (en) | 2020-11-10 |
Family
ID=65329869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811554581.8A Active CN109356875B (en) | 2018-12-18 | 2018-12-18 | Server fan control method, device and system |
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| Country | Link |
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| CN (1) | CN109356875B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826822A (en) * | 2019-04-11 | 2019-05-31 | 苏州浪潮智能科技有限公司 | A kind of control method for fan and relevant apparatus |
| CN109882440A (en) * | 2019-04-16 | 2019-06-14 | 苏州浪潮智能科技有限公司 | A kind of fan rotation speed control apparatus and control method |
| CN111124827A (en) * | 2019-12-22 | 2020-05-08 | 苏州浪潮智能科技有限公司 | Monitoring device and monitoring method for equipment fan |
| CN111382027A (en) * | 2020-02-29 | 2020-07-07 | 浪潮电子信息产业股份有限公司 | BMC IP obtaining method and device and cabinet type server |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213227A (en) * | 2010-04-02 | 2011-10-12 | 英业达股份有限公司 | Multi-fan combined control system |
| CN107023504A (en) * | 2017-06-02 | 2017-08-08 | 郑州云海信息技术有限公司 | A kind of fan control system and control method based on BMC |
| CN206647293U (en) * | 2017-03-03 | 2017-11-17 | 郑州云海信息技术有限公司 | A kind of server fan rotating speed control system based on CPLD |
| CN108170575A (en) * | 2017-12-25 | 2018-06-15 | 曙光信息产业(北京)有限公司 | A kind of control method and device of server radiating |
-
2018
- 2018-12-18 CN CN201811554581.8A patent/CN109356875B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213227A (en) * | 2010-04-02 | 2011-10-12 | 英业达股份有限公司 | Multi-fan combined control system |
| CN206647293U (en) * | 2017-03-03 | 2017-11-17 | 郑州云海信息技术有限公司 | A kind of server fan rotating speed control system based on CPLD |
| CN107023504A (en) * | 2017-06-02 | 2017-08-08 | 郑州云海信息技术有限公司 | A kind of fan control system and control method based on BMC |
| CN108170575A (en) * | 2017-12-25 | 2018-06-15 | 曙光信息产业(北京)有限公司 | A kind of control method and device of server radiating |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826822A (en) * | 2019-04-11 | 2019-05-31 | 苏州浪潮智能科技有限公司 | A kind of control method for fan and relevant apparatus |
| CN109882440A (en) * | 2019-04-16 | 2019-06-14 | 苏州浪潮智能科技有限公司 | A kind of fan rotation speed control apparatus and control method |
| CN111124827A (en) * | 2019-12-22 | 2020-05-08 | 苏州浪潮智能科技有限公司 | Monitoring device and monitoring method for equipment fan |
| CN111124827B (en) * | 2019-12-22 | 2022-12-02 | 苏州浪潮智能科技有限公司 | Monitoring device and monitoring method for equipment fan |
| CN111382027A (en) * | 2020-02-29 | 2020-07-07 | 浪潮电子信息产业股份有限公司 | BMC IP obtaining method and device and cabinet type server |
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| Publication number | Publication date |
|---|---|
| CN109356875B (en) | 2020-11-10 |
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