US20230349387A1 - System and method for ensuring continued operation of fan notwithstanding bmc failure - Google Patents
System and method for ensuring continued operation of fan notwithstanding bmc failure Download PDFInfo
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- US20230349387A1 US20230349387A1 US17/886,799 US202217886799A US2023349387A1 US 20230349387 A1 US20230349387 A1 US 20230349387A1 US 202217886799 A US202217886799 A US 202217886799A US 2023349387 A1 US2023349387 A1 US 2023349387A1
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000002159 abnormal effect Effects 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 50
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 27
- 238000001816 cooling Methods 0.000 abstract 1
- 102100024061 Integrator complex subunit 1 Human genes 0.000 description 5
- 101710092857 Integrator complex subunit 1 Proteins 0.000 description 5
- 102100028043 Fibroblast growth factor 3 Human genes 0.000 description 4
- 108050002021 Integrator complex subunit 2 Proteins 0.000 description 4
- 101710092886 Integrator complex subunit 3 Proteins 0.000 description 3
- 102100025254 Neurogenic locus notch homolog protein 4 Human genes 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Images
Classifications
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- 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
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
-
- 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
-
- 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
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0693—Details or arrangements of the wiring
-
- 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
- F04D27/001—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
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20718—Forced ventilation of a gaseous coolant
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20836—Thermal management, e.g. server temperature control
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Definitions
- the present disclosure relates to the technical field of server, in particular to a system and method for controlling fan.
- the server ensures that its own fan is operating.
- the baseboard management controller (BMC) of the server applies a control method for the baseboard management controller (BMC) to output pulse width modulation (PWM) signals to the fan to adjust the speed of the fan.
- PWM pulse width modulation
- the fan may work abnormally, or even stop, leading to overheating of the server and shut down.
- FIG. 1 is a schematic diagram of a fan control system according to an embodiment of the present disclosure.
- FIG. 2 is a schematic diagram of the fan control system according to another embodiment of the present disclosure.
- FIG. 3 is a schematic diagram of the fan control system according to another embodiment of the present disclosure.
- FIG. 4 is a flowchart of a fan control method according to an embodiment of the present disclosure.
- first”, “second” and other terms are only used for the purpose of distinguishing between descriptions and cannot be understood as indicating or implying relative importance, or as indicating or implying order.
- the features defined as “first” and “second” may include one or more of the features explicitly or implicitly.
- the terms “exemplary” or “for example” are used as examples or explanations. Any embodiment or design described as “exemplary” or “for example” in the embodiments of the present disclosure shall not be interpreted as being more preferred or advantageous than other embodiments or designs.
- first and second are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features.
- first and second defining features can explicitly or implicitly include one or more of the features.
- FIG. 1 illustrates a fan control system 100 in accordance with an embodiment of the present disclosure.
- the fan control system 100 is used to control the operation of a fan 200 .
- the fan control system 100 can be installed in the server (not shown in the figure) to reduce the risk of fan malfunction leading to server overheating and shutdown.
- the fan control system 100 includes a baseboard management controller (BMC) 10 and a control module 20 that are electrically connected to each other.
- BMC baseboard management controller
- the control module 20 may be a controller.
- the control module 20 is electrically connected between the BMC 10 and the fan 200 .
- the control module 20 is used to receive the first signal output by the BMC and determine whether the BMC 10 is in an abnormal state according to the received first signal.
- control module 20 When the control module 20 detects that the BMC 10 is in an abnormal state, the control module 20 outputs a preset pulse width modulation (PWM) signal to the fan 200 to keep the fan 200 running.
- PWM pulse width modulation
- the control module 20 controls the fan 200 to operate according to the received first signal.
- control module 20 When the control module 20 detects that the first signal, for a preset number of continuous cycles, is in an error state, the control module 20 determines that the BMC 10 is in an abnormal state. On the contrary, when the control module 20 detects that the first signal is not in an error state continuously within a preset number of cycles, the control module 20 determines that the BMC 10 is in a normal state.
- control module 20 includes a detection unit 21 , a storage unit 22 , and a signal selection unit 23 .
- the detection unit 21 is electrically connected between the BMC 10 and the signal selection unit 23 to detect whether the first signal is in an error state continuously within a preset number of cycles, so as to output the corresponding second signal to the signal selection unit 23 .
- the first signal output by the BMC 10 can be a dynamic PWM signal.
- the dynamic PWM signal refers to the PWM signal that the BMC 10 adjusts in real time according to the temperature of the server.
- the error state means that the level state of the first signal remains unchanged.
- the control module 20 determines that the BMC 10 is in an abnormal state.
- the control module 20 detects that the first signal is not in an error state continuously within a preset number of cycles, that is, the level state of the first signal has changed at least once in a preset number of consecutive cycles, the control module 20 determines that the BMC 10 is in a normal state.
- the level state of the first signal can remain unchanged, that is, either the level state of the first signal remains at high-level or the level state of the first signal remains at low-level.
- a change in the level state of the first signal may be the first signal falling from the high-level state to the low-level state, or the first signal rising from the low-level state to the high-level state.
- each cycle is a continuous period of time, such as one second.
- the duty cycle of the first signal is slightly less than 100%, such as 99%. That is, even if the fan 200 operates at full speed, the first signal used to control the fan 200 to operate at full speed can change from high to low level at least once in the preset cycle.
- the detection unit 21 can determine whether the BMC 10 is in an abnormal state by detecting the absence of a change in the level state within a preset number of cycles in the generated first signal.
- the detection unit 21 detects that the first signal has not changed the level state within a preset number of cycles (such as 5 cycles), that is, the BMC 10 is in an abnormal state, the second signal output by the detection unit 21 is in the first level state, such as a low-level state.
- the detection unit 21 detects that the first signal has changed the level state within a preset number of cycles (such as 5 cycles), that is, the BMC 10 is in a normal state
- the second signal output by the detection unit 21 is in the second level state, such as a high-level state.
- the storage unit 22 is electrically connected to the signal selection unit 23 , the storage unit 22 is used to output a preset PWM signal to the signal selection unit 23 .
- the preset PWM signal is also a pulse width modulated signal.
- the storage unit 22 may be a register.
- the signal selection unit 23 is also directly electrically connected to the BMC 10 , to receive the first signal.
- the signal selection unit 23 outputs a target PWM signal directed to the fan 200 according to the level state of the second signal input by the detection unit 21 and controls the fan 200 to operate at the speed of the target PWM.
- the target PWM signal is either the first signal or the preset PWM signal according to the level state of the second signal.
- the signal selection unit 23 selects the first signal or the preset PWM signal to output to the fan 200 according to the level state of the second signal input by the detection unit 21 to control the operation of the fan 200 .
- the signal selection unit 23 includes a first input terminal INT 1 , a second input terminal INT 2 , a third input terminal INT 3 , and an output terminal OUT.
- the first input terminal INT 1 is electrically connected to the output terminal of the detection unit 21 for receiving the second signal.
- the second input terminal INT 2 is electrically connected to the BMC 10 for receiving the first signal.
- the third input terminal INT 3 is electrically connected to the output terminal of the storage unit 22 to receive a preset PWM signal.
- the output terminal OUT of the signal selection unit 23 is electrically connected to the fan 200 for outputting a target PWM signal to the fan 200 .
- the preset number of cycles is k cycles (for example, k is equal to 5), and when during the k-th cycle and any cycle after that, the level state of the second signal received by the first input terminal INT 1 of the signal selection unit 23 is low. That is, when the BMC 10 is currently in an abnormal state, the target PWM signal output by the signal selection unit 23 is a preset PWM signal. Thereby, the fan 200 operates at a preset speed upon receiving the target PWM signal.
- the fan 200 operates at a corresponding speed after receiving the target PWM signal.
- the target PWM signal output by the signal selection unit 23 is the first signal at this time.
- the duty cycle of the output first signal in each cycle is 99%.
- the fan control system 100 controls the fan 200 to run at full speed in the previous k ⁇ 1 cycle.
- the duty cycle refers to the proportion of the effective signal time to the total time in a cycle.
- the effective pulse width of the first signal may be 1 ⁇ s.
- the preset period can be 4 ⁇ s, and then in the current cycle, the duty cycle of the first signal is 0.25, that is, at this time, the value of the duty cycle of the first signal is 0.25.
- the signal selection unit 23 is a multiplexer (MUX).
- the duty cycle of the preset PWM signal output by the storage unit 22 can be set by those skilled in the art according to needs.
- the present disclosure does not limit the duty cycle of the preset PWM signal.
- the detection unit 21 determines whether the BMC 10 is in an abnormal state by determining whether there is a change in the level state of the first signal of the current cycle and the previous k ⁇ 1 cycles.
- the detection unit 21 detects that the level state of the first signal of the current cycle and the previous k ⁇ 1 cycles remains unchanged, the detection unit 21 determines that the BMC 10 is in an abnormal state and outputs the second signal in a low-level state.
- the detection unit 21 detects at least one change in the level state of the first signal in the current cycle and the previous k ⁇ 1 cycles, the detection unit 21 determines that the BMC 10 is in a normal state and outputs the second signal in a high-level state.
- the control module 20 may be a complex programmable logic device (CPLD). It can be understood that in other embodiments, the control module 20 can also be an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
- CPLD complex programmable logic device
- ASIC application specific integrated circuit
- FPGA field programmable gate array
- the fan control system 100 further includes a warning unit (not shown), such as LED lights, buzzers, voice modules, and other graphic warning modules.
- the warning unit is electrically connected to the control module 20 .
- the control module 20 controls the warning unit to output information to technicians to make repairs.
- the fan control system 100 of the embodiment of the present disclosure detects whether the first signal output by the BMC 10 remains unchanged for a preset number of cycles, through the detection unit 21 , to determine whether the BMC is in an abnormal state.
- the control module 20 outputs a preset PWM signal to control and continue the normal operation of the fan 200 , so as to ensure the heat dissipation from the server and reduce the risk of the server shutting down due to overheating.
- FIG. 3 illustrates a fan control system 100 a in accordance with an embodiment of the present disclosure.
- the fan control system 100 a includes a BMC 10 and a control module 20 a.
- control module 20 a also includes a signal processing unit 24 and a PWM signal generation unit 25 .
- the level state of the first signal not changing remains the error state.
- the first signal output by the BMC 10 is a dynamic PWM signal.
- the signal processing unit 24 is electrically connected between the BMC 10 and the signal selection unit 23 to process the received first signal to obtain the duty cycle of the first signal in each preset cycle and generate the corresponding third signal.
- the value of the third signal is the duty cycle value of the PWM signal contained in the first signal.
- the storage unit 22 is electrically connected to the signal selection unit 23 for outputting a preset adjustment signal to the signal selection unit 23 .
- the value of the preset adjustment signal is also the preset duty cycle value.
- the signal selection unit 23 is used to select and output the third signal or the preset adjustment signal to the PWM signal generation unit 25 according to the state of the second signal input by the detection unit 21 , so as to control the PWM signal generation unit 25 to generate the pulse width modulated signal.
- the fourth signal output by the signal selection unit 23 is either the third signal or it is the preset adjustment signal.
- the first input terminal INT 1 of the signal selection unit 23 is electrically connected to the output terminal of the detection unit 21 for receiving the second signal.
- the second input terminal INT 2 is electrically connected to the output terminal of the signal processing unit 24 for receiving the third signal.
- the third input terminal INT 3 is electrically connected to the output terminal of the storage unit 22 to receive a preset adjustment signal.
- the output terminal OUT of the signal selection unit 23 is electrically connected to the PWM signal generation unit 25 to output a fourth signal to the PWM signal generation unit 25 .
- the PWM signal generation unit 25 is used to receive the fourth signal output by the signal selection unit 23 to generate the corresponding PWM signal, so as to control the fan 200 to operate at a speed to dissipate heat from the server.
- the PWM signal generation unit 25 When the fourth signal received by the PWM signal generation unit 25 is a third signal, the PWM signal generation unit 25 generates a target pulse width modulated signal according to the third signal and outputs it to the fan 200 .
- the PWM signal generation unit 25 When the fourth signal received by the PWM signal generation unit 25 is a preset adjustment signal, the PWM signal generation unit 25 generates a preset pulse width modulation signal according to the preset adjustment signal and outputs it to the fan 200 .
- the preset adjustment signal stored by the storage unit 22 can be data containing the duty cycle value, and the duty cycle of the first signal can be extracted by the signal processing unit 24 . Therefore, the number of PWM signals required by the fan control system 100 can be reduced, and complexity of the circuitry for the fan control system 100 can be reduced.
- the first signal output by the BMC 10 can also be an inter integrated circuit (I2C) signal, and the first signal contains the duty cycle value.
- the error state is the loss of the first signal, that is, the BMC 10 does not output the first signal.
- I2C bus is the existing signal transmission line between the BMC 10 and control module 20 .
- the BMC 10 does not need to output additional PWM signal, the duty cycle value of PWM signal is merely stored in the register, and I2C bus is electrically connected to the register, so that the BMC 10 can output the first signal to the signal processing unit 24 .
- the BMC 10 does not need to set an additional PWM signal generation module, which can simplify the circuit structure.
- the BMC 10 is provided with a specific register (not shown in the figures) to output the first signal at a fixed time.
- the BMC 10 outputs the first signal in a period of one second. It is understandable that when the BMC 10 does not output the first signal continuously within a preset number of cycles, it can be considered that the BMC 10 is in an abnormal state.
- the detection unit 21 is electrically connected between the BMC 10 and the signal selection unit 23 to detect whether the BMC 10 outputs a first signal within a preset number of consecutive cycles, to output a second signal to the signal selection unit 23 .
- the detection unit 21 detects that the BMC 10 has not output the first signal continuously for a preset number of cycles, such as k cycles, that is, when the BMC 10 is in an abnormal state, and the detection unit 21 outputs the second signal in the first level state to the signal selection unit 23 .
- the detection unit 21 detects that the first signal has not been output by the BMC 10 for at most k ⁇ 1 consecutive cycles, that is, when the BMC 10 is in the normal state, and the detection unit 21 outputs the second signal in the second level state to the signal selection unit 23 .
- the BMC 10 is connected to the control module 20 through the I2C bus.
- the signal processing unit 24 is used to decode the received first signal based on the I2C protocol to output a corresponding third signal.
- the third signal is also a signal containing the duty cycle value.
- the signal processing unit 24 is also provided with a specific register (not shown in the figures) for storing the value of the third signal obtained from the previous cycle of processing.
- the signal processing unit 24 outputs the third signal processed in the previous cycle to the second input terminal INT 2 of the signal selection unit 23 , so that the signal selection unit outputs the fourth signal and controls the fan 200 to continue working normally.
- FIG. 4 is a flowchart depicting an embodiment of a fan control method.
- the fan control method can be applied to the fan control system 100 as described above.
- the fan control method can be performed by the control module 20 or the control module 20 a.
- Each block shown in FIG. 4 represents one or more processes, methods, or subroutines, carried out in the example method. Furthermore, the illustrated order of blocks is illustrative only and the order of the blocks can change. Additional blocks can be added or fewer blocks may be utilized, without departing from the present disclosure.
- the example method can begin at block 41 .
- block 42 determining whether the first signal is in an error state continuously within a preset number of cycles. If the first signal is in an error state continuously within a preset number of cycles, block 43 is implement, otherwise block 44 is implement.
- the error state is the error state mentioned in the above embodiments 1 to 2, which will not be repeated here.
- Each functional module in each embodiment of the present disclosure can be integrated in the same processing module, each module can exist separately, or two or more modules can be integrated in the same module.
- the above integrated modules can be realized in the form of hardware or hardware plus software function modules.
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Abstract
A system for maintaining the operation of a cooling fan for a server if that function of a baseboard management controller (BMC) of the server should fail includes the BMC and a control module. The control module is electrically connected to the BMC and the fan, and the control module receives a first signal outputted by the BMC in a cycle and determines the state of the BMC depending on whether the first signal includes a change in level or fails to include a change in level. When an abnormal state of the BMC is determined, the control module outputs a preset pulse width modulation (PWM) signal to the fan to maintain operation of the fan. The present disclosure also provides a fan control method.
Description
- The present disclosure relates to the technical field of server, in particular to a system and method for controlling fan.
- In order to ensure the stability of the server, the server ensures that its own fan is operating. At present, the baseboard management controller (BMC) of the server applies a control method for the baseboard management controller (BMC) to output pulse width modulation (PWM) signals to the fan to adjust the speed of the fan. However, when BMC is working abnormally, the fan may work abnormally, or even stop, leading to overheating of the server and shut down.
- Therefore, improvement is desired.
-
FIG. 1 is a schematic diagram of a fan control system according to an embodiment of the present disclosure. -
FIG. 2 is a schematic diagram of the fan control system according to another embodiment of the present disclosure. -
FIG. 3 is a schematic diagram of the fan control system according to another embodiment of the present disclosure. -
FIG. 4 is a flowchart of a fan control method according to an embodiment of the present disclosure. - The technical solutions in the embodiments of the present disclosure will be described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure. The terms used in the description of the present disclosure herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.
- In the embodiment of the present disclosure, “first”, “second” and other terms are only used for the purpose of distinguishing between descriptions and cannot be understood as indicating or implying relative importance, or as indicating or implying order. The features defined as “first” and “second” may include one or more of the features explicitly or implicitly. In the description of the embodiments of the present disclosure, the terms “exemplary” or “for example” are used as examples or explanations. Any embodiment or design described as “exemplary” or “for example” in the embodiments of the present disclosure shall not be interpreted as being more preferred or advantageous than other embodiments or designs.
- In the article, unless otherwise expressly specified and limited, for location words, the terms “above”, “below”, “upper end”, “lower end”, “lower surface”, “clockwise”, “counterclockwise”, “left”, “right” and so on indicate that the location and position relationship are based on the location or position relationship shown in the attached drawings, and are only for the convenience of describing this article and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed, or be operated in a specific orientation, it cannot be understood as limiting the specific scope of protection of the present disclosure.
- In the article, unless otherwise expressly specified and limited, the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, “first” and “second” defining features can explicitly or implicitly include one or more of the features.
- Some embodiments of the present disclosure are described in detail below in combination with the accompanying drawings. Without conflict, the following embodiments and features in the embodiments can be combined with each other.
-
FIG. 1 illustrates afan control system 100 in accordance with an embodiment of the present disclosure. - The
fan control system 100 is used to control the operation of afan 200. Thefan control system 100 can be installed in the server (not shown in the figure) to reduce the risk of fan malfunction leading to server overheating and shutdown. Thefan control system 100 includes a baseboard management controller (BMC) 10 and acontrol module 20 that are electrically connected to each other. In some embodiments, thecontrol module 20 may be a controller. - The
control module 20 is electrically connected between the BMC 10 and thefan 200. Thecontrol module 20 is used to receive the first signal output by the BMC and determine whether the BMC 10 is in an abnormal state according to the received first signal. - When the
control module 20 detects that the BMC 10 is in an abnormal state, thecontrol module 20 outputs a preset pulse width modulation (PWM) signal to thefan 200 to keep thefan 200 running. When thecontrol module 20 detects that the BMC 10 is in a normal state, thecontrol module 20 controls thefan 200 to operate according to the received first signal. - When the
control module 20 detects that the first signal, for a preset number of continuous cycles, is in an error state, thecontrol module 20 determines that the BMC 10 is in an abnormal state. On the contrary, when thecontrol module 20 detects that the first signal is not in an error state continuously within a preset number of cycles, thecontrol module 20 determines that the BMC 10 is in a normal state. - Referring to
FIG. 2 , in one embodiment, thecontrol module 20 includes adetection unit 21, astorage unit 22, and asignal selection unit 23. - The
detection unit 21 is electrically connected between the BMC 10 and thesignal selection unit 23 to detect whether the first signal is in an error state continuously within a preset number of cycles, so as to output the corresponding second signal to thesignal selection unit 23. - The first signal output by the BMC 10 can be a dynamic PWM signal.
- The dynamic PWM signal refers to the PWM signal that the BMC 10 adjusts in real time according to the temperature of the server. The error state means that the level state of the first signal remains unchanged.
- When the level state of the first signal remains unchanged for a preset number of cycles, the
control module 20 determines that the BMC 10 is in an abnormal state. When thecontrol module 20 detects that the first signal is not in an error state continuously within a preset number of cycles, that is, the level state of the first signal has changed at least once in a preset number of consecutive cycles, thecontrol module 20 determines that the BMC 10 is in a normal state. - The level state of the first signal can remain unchanged, that is, either the level state of the first signal remains at high-level or the level state of the first signal remains at low-level.
- A change in the level state of the first signal may be the first signal falling from the high-level state to the low-level state, or the first signal rising from the low-level state to the high-level state.
- In the embodiment of the present disclosure, each cycle is a continuous period of time, such as one second.
- When the
fan 200 is running at full speed, that is, when thefan 200 is running at the highest speed, the duty cycle of the first signal is slightly less than 100%, such as 99%. That is, even if thefan 200 operates at full speed, the first signal used to control thefan 200 to operate at full speed can change from high to low level at least once in the preset cycle. Thedetection unit 21 can determine whether the BMC 10 is in an abnormal state by detecting the absence of a change in the level state within a preset number of cycles in the generated first signal. - When the
detection unit 21 detects that the first signal has not changed the level state within a preset number of cycles (such as 5 cycles), that is, the BMC 10 is in an abnormal state, the second signal output by thedetection unit 21 is in the first level state, such as a low-level state. When thedetection unit 21 detects that the first signal has changed the level state within a preset number of cycles (such as 5 cycles), that is, the BMC 10 is in a normal state, the second signal output by thedetection unit 21 is in the second level state, such as a high-level state. - In the embodiment of the present disclosure, the
storage unit 22 is electrically connected to thesignal selection unit 23, thestorage unit 22 is used to output a preset PWM signal to thesignal selection unit 23. In the embodiment of the present disclosure, the preset PWM signal is also a pulse width modulated signal. - In some embodiments, the
storage unit 22 may be a register. - In the embodiment of the present disclosure, the
signal selection unit 23 is also directly electrically connected to the BMC 10, to receive the first signal. Thesignal selection unit 23 outputs a target PWM signal directed to thefan 200 according to the level state of the second signal input by thedetection unit 21 and controls thefan 200 to operate at the speed of the target PWM. The target PWM signal is either the first signal or the preset PWM signal according to the level state of the second signal. - The
signal selection unit 23 selects the first signal or the preset PWM signal to output to thefan 200 according to the level state of the second signal input by thedetection unit 21 to control the operation of thefan 200. - For example, the
signal selection unit 23 includes a first input terminal INT1, a second input terminal INT2, a third input terminal INT3, and an output terminal OUT. - The first input terminal INT1 is electrically connected to the output terminal of the
detection unit 21 for receiving the second signal. The second input terminal INT2 is electrically connected to the BMC 10 for receiving the first signal. The third input terminal INT3 is electrically connected to the output terminal of thestorage unit 22 to receive a preset PWM signal. The output terminal OUT of thesignal selection unit 23 is electrically connected to thefan 200 for outputting a target PWM signal to thefan 200. - When the preset number of cycles is k cycles (for example, k is equal to 5), and when during the k-th cycle and any cycle after that, the level state of the second signal received by the first input terminal INT1 of the
signal selection unit 23 is low. That is, when theBMC 10 is currently in an abnormal state, the target PWM signal output by thesignal selection unit 23 is a preset PWM signal. Thereby, thefan 200 operates at a preset speed upon receiving the target PWM signal. - When the preset number of cycles is k cycles (for example, k is equal to 5), and when during the k-th cycle and any cycle after that, the level state of the second signal received by the first input terminal INT1 of the
signal selection unit 23 is high, the target PWM signal output by thesignal selection unit 23 is the first signal. Thereby, thefan 200 operates at a corresponding speed after receiving the target PWM signal. - Until the operation cycle of the
fan control system 100 has reached the preset number of cycles, that is, the level state of the second signal output by thedetection unit 21 is high in the previous k−1 cycle of thefan control system 100, the target PWM signal output by thesignal selection unit 23 is the first signal at this time. - In some embodiments, until the operation cycle of the
fan control system 100 has reached the preset number of cycles, that is, during the previous k−1 cycles of theBMC 10, the duty cycle of the output first signal in each cycle is 99%. Thefan control system 100 controls thefan 200 to run at full speed in the previous k−1 cycle. - The duty cycle refers to the proportion of the effective signal time to the total time in a cycle. For example, the effective pulse width of the first signal may be 1 μs. The preset period can be 4 μs, and then in the current cycle, the duty cycle of the first signal is 0.25, that is, at this time, the value of the duty cycle of the first signal is 0.25.
- In the embodiment, the
signal selection unit 23 is a multiplexer (MUX). - The duty cycle of the preset PWM signal output by the
storage unit 22 can be set by those skilled in the art according to needs. The present disclosure does not limit the duty cycle of the preset PWM signal. - In the embodiment, when the preset number of cycles is k cycles (for example, k is equal to 5), the
detection unit 21 determines whether theBMC 10 is in an abnormal state by determining whether there is a change in the level state of the first signal of the current cycle and the previous k−1 cycles. When thedetection unit 21 detects that the level state of the first signal of the current cycle and the previous k−1 cycles remains unchanged, thedetection unit 21 determines that theBMC 10 is in an abnormal state and outputs the second signal in a low-level state. When thedetection unit 21 detects at least one change in the level state of the first signal in the current cycle and the previous k−1 cycles, thedetection unit 21 determines that theBMC 10 is in a normal state and outputs the second signal in a high-level state. - The
control module 20 may be a complex programmable logic device (CPLD). It can be understood that in other embodiments, thecontrol module 20 can also be an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. - In some embodiments, the
fan control system 100 further includes a warning unit (not shown), such as LED lights, buzzers, voice modules, and other graphic warning modules. The warning unit is electrically connected to thecontrol module 20. When thedetection unit 21 detects that theBMC 10 is in an abnormal state, thecontrol module 20 controls the warning unit to output information to technicians to make repairs. - The
fan control system 100 of the embodiment of the present disclosure detects whether the first signal output by theBMC 10 remains unchanged for a preset number of cycles, through thedetection unit 21, to determine whether the BMC is in an abnormal state. When thedetection unit 21 detects that theBMC 10 is in an abnormal state, thecontrol module 20 outputs a preset PWM signal to control and continue the normal operation of thefan 200, so as to ensure the heat dissipation from the server and reduce the risk of the server shutting down due to overheating. -
FIG. 3 illustrates afan control system 100 a in accordance with an embodiment of the present disclosure. - The
fan control system 100 a includes aBMC 10 and acontrol module 20 a. - The difference between the
fan control system 100 a and thefan control system 100 is that thecontrol module 20 a also includes asignal processing unit 24 and a PWMsignal generation unit 25. The level state of the first signal not changing remains the error state. - In the embodiment, the first signal output by the
BMC 10 is a dynamic PWM signal. - In the embodiment, the
signal processing unit 24 is electrically connected between theBMC 10 and thesignal selection unit 23 to process the received first signal to obtain the duty cycle of the first signal in each preset cycle and generate the corresponding third signal. The value of the third signal is the duty cycle value of the PWM signal contained in the first signal. - The
storage unit 22 is electrically connected to thesignal selection unit 23 for outputting a preset adjustment signal to thesignal selection unit 23. In the embodiment of the present disclosure, the value of the preset adjustment signal is also the preset duty cycle value. - The
signal selection unit 23 is used to select and output the third signal or the preset adjustment signal to the PWMsignal generation unit 25 according to the state of the second signal input by thedetection unit 21, so as to control the PWMsignal generation unit 25 to generate the pulse width modulated signal. In other words, the fourth signal output by thesignal selection unit 23 is either the third signal or it is the preset adjustment signal. - The first input terminal INT1 of the
signal selection unit 23 is electrically connected to the output terminal of thedetection unit 21 for receiving the second signal. The second input terminal INT2 is electrically connected to the output terminal of thesignal processing unit 24 for receiving the third signal. The third input terminal INT3 is electrically connected to the output terminal of thestorage unit 22 to receive a preset adjustment signal. The output terminal OUT of thesignal selection unit 23 is electrically connected to the PWMsignal generation unit 25 to output a fourth signal to the PWMsignal generation unit 25. - The PWM
signal generation unit 25 is used to receive the fourth signal output by thesignal selection unit 23 to generate the corresponding PWM signal, so as to control thefan 200 to operate at a speed to dissipate heat from the server. When the fourth signal received by the PWMsignal generation unit 25 is a third signal, the PWMsignal generation unit 25 generates a target pulse width modulated signal according to the third signal and outputs it to thefan 200. When the fourth signal received by the PWMsignal generation unit 25 is a preset adjustment signal, the PWMsignal generation unit 25 generates a preset pulse width modulation signal according to the preset adjustment signal and outputs it to thefan 200. - In the present disclosure, the preset adjustment signal stored by the
storage unit 22 can be data containing the duty cycle value, and the duty cycle of the first signal can be extracted by thesignal processing unit 24. Therefore, the number of PWM signals required by thefan control system 100 can be reduced, and complexity of the circuitry for thefan control system 100 can be reduced. - Referring to
FIG. 3 , in another embodiment, the first signal output by theBMC 10 can also be an inter integrated circuit (I2C) signal, and the first signal contains the duty cycle value. In this embodiment, the error state is the loss of the first signal, that is, theBMC 10 does not output the first signal. - I2C bus is the existing signal transmission line between the
BMC 10 andcontrol module 20. - The
BMC 10 does not need to output additional PWM signal, the duty cycle value of PWM signal is merely stored in the register, and I2C bus is electrically connected to the register, so that theBMC 10 can output the first signal to thesignal processing unit 24. In the embodiment, theBMC 10 does not need to set an additional PWM signal generation module, which can simplify the circuit structure. - In some embodiments, the
BMC 10 is provided with a specific register (not shown in the figures) to output the first signal at a fixed time. - For example, in the
fan control system 100 a, theBMC 10 outputs the first signal in a period of one second. It is understandable that when theBMC 10 does not output the first signal continuously within a preset number of cycles, it can be considered that theBMC 10 is in an abnormal state. - The
detection unit 21 is electrically connected between theBMC 10 and thesignal selection unit 23 to detect whether theBMC 10 outputs a first signal within a preset number of consecutive cycles, to output a second signal to thesignal selection unit 23. - When the
detection unit 21 detects that theBMC 10 has not output the first signal continuously for a preset number of cycles, such as k cycles, that is, when theBMC 10 is in an abnormal state, and thedetection unit 21 outputs the second signal in the first level state to thesignal selection unit 23. When thedetection unit 21 detects that the first signal has not been output by theBMC 10 for at most k−1 consecutive cycles, that is, when theBMC 10 is in the normal state, and thedetection unit 21 outputs the second signal in the second level state to thesignal selection unit 23. - In the embodiment, the
BMC 10 is connected to thecontrol module 20 through the I2C bus. Thesignal processing unit 24 is used to decode the received first signal based on the I2C protocol to output a corresponding third signal. It can be understood that in the embodiment of the present disclosure, the third signal is also a signal containing the duty cycle value. - In the embodiment, the
signal processing unit 24 is also provided with a specific register (not shown in the figures) for storing the value of the third signal obtained from the previous cycle of processing. When theBMC 10 does not output the first signal within k−1 cycles, thesignal processing unit 24 outputs the third signal processed in the previous cycle to the second input terminal INT2 of thesignal selection unit 23, so that the signal selection unit outputs the fourth signal and controls thefan 200 to continue working normally. -
FIG. 4 is a flowchart depicting an embodiment of a fan control method. The fan control method can be applied to thefan control system 100 as described above. The fan control method can be performed by thecontrol module 20 or thecontrol module 20 a. - Each block shown in
FIG. 4 represents one or more processes, methods, or subroutines, carried out in the example method. Furthermore, the illustrated order of blocks is illustrative only and the order of the blocks can change. Additional blocks can be added or fewer blocks may be utilized, without departing from the present disclosure. The example method can begin atblock 41. - At
block 41, receiving a first signal input by a BMC - At
block 42, determining whether the first signal is in an error state continuously within a preset number of cycles. If the first signal is in an error state continuously within a preset number of cycles, block 43 is implement, otherwise block 44 is implement. - The error state is the error state mentioned in the
above embodiments 1 to 2, which will not be repeated here. - In
block 42, when it is detected that the first signal is in an error state continuously for a preset number of cycles, it is determined that theBMC 10 is in an abnormal state. - At
block 43, outputting a preset pulse width modulation signal to a fan. Inblock 42, When it is detected that the first signal is not in the error state continuously within the preset number of cycles, it is determined that theBMC 10 is in a normal state. - At
block 44, controlling operation of the fan according to the first signal. - Each functional module in each embodiment of the present disclosure can be integrated in the same processing module, each module can exist separately, or two or more modules can be integrated in the same module. The above integrated modules can be realized in the form of hardware or hardware plus software function modules.
- Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present disclosure, but not to limit the present disclosure. As long as they are within the essential spirit of the present disclosure, the above embodiments are appropriately made and changes fall within the scope of protection of the present disclosure.
Claims (20)
1. A fan control system configured for controlling a fan to operate and comprising:
a baseboard management controller (BMC);
a control module electrically connected to the BMC and the fan, and configured to receive a first signal outputted by the BMC and determine whether the BMC is in an abnormal state according to the first signal;
wherein when the BMC is in an abnormal state, the control module outputs a preset pulse width modulation (PWM) signal to the fan to keep continuous operation of the fan; and
wherein when the first signal is in an error state continuously within a preset number of cycles, the control module determines the BMC is in the abnormal state.
2. The fan control system of claim 1 , wherein when the BMC is in a normal state, the control module control module controls operation of the fan according to the first signal; wherein when the first signal is not in an error state continuously within a preset number of cycles, the control module determines the BMC is in the normal state.
3. The fan control system of claim 2 , wherein the control module further comprises a detection unit, a storage unit and a signal selection unit, the detection unit is electrically connected between the BMC and the signal selection unit to detect whether a level state of the first signal is continuously in the error state within the preset number of cycles, to output a second signal to the signal selection unit; the storage unit is electrically connected to the signal selection unit, the storage unit is configured to output the preset PWM signal to the signal selection unit; the BMC is electrically connected to the signal selection unit, the signal selection unit is configured to output the first signal to the signal selection unit; and the signal selection unit is electrically connected to the fan, and the signal selection unit selects to output the first signal or the preset PWM signal to the fan according to the second signal.
4. The fan control system of claim 3 , wherein when the detection unit detects the BMC is in the abnormal state according to the first signal, the detection unit outputs the second signal, and the second signal is in a first level state, the signal selection unit outputs the preset PWM signal to the fan according to the second signal; and when the detection unit detects the BMC is in the normal state according to the first signal, the detection unit outputs the second signal, and the second signal is in a second level state, the signal selection unit outputs the first signal to the fan according to the second signal.
5. The fan control system of claim 4 , wherein the first signal is a PWM signal.
6. The fan control system of claim 1 , wherein the error state is that level state of the first signal remains unchanged.
7. The fan control system of claim 1 , wherein the control module further comprises a detection unit, a storage unit, a signal selection unit, a signal processing unit and a PWM signal generation unit, the detection unit is electrically connected between the BMC and the signal selection unit to detect whether a level state of the first signal is continuously in the error state within the preset number of cycles, to output a second signal to the signal selection unit; the signal processing unit is electrically connected between the BMC and the signal selection unit, the signal processing unit is configured to process the first signal to obtain a duty cycle of the first signal in each preset cycle and generate a third signal, and output the third signal to the signal selection unit; the storage unit is electrically connected to the signal selection unit, the storage unit is configured to output a preset adjustment signal to the signal selection unit; the signal selection unit is also electrically connected to the PWM signal generation unit, and the signal selection unit selects to output the third signal or the preset adjustment signal to the PWM signal generation unit according to the second signal; the PWM signal generation unit is electrically connected to the fan, the PWM signal generation unit is configured to generate a target PWM signal according to the third signal and outputting the target PWM signal to the fan, or the PWM signal generation unit is configured to generate the preset PWM signal according to the preset adjustment signal and output the preset PWM signal to the fan.
8. The fan control system of claim 7 , wherein when the detection unit detects the BMC is in the abnormal state according to the first signal, the detection unit outputs the second signal, and the second signal is in a first level state, the signal selection unit outputs the preset adjustment signal to the PWM signal generation unit according to the second signal; and when the detection unit detects the BMC is in the normal state according to the first signal, the detection unit outputs the second signal, and the second signal is in a second level state, the signal selection unit outputs the third signal to the PWM signal generation unit according to the second signal.
9. The fan control system of claim 8 , wherein the error state is that level state of the first signal remains unchanged, and the first signal is a PWM signal.
10. The fan control system of claim 8 , wherein the BMC is electrically connected to the signal processing unit through an integrated circuit bus, and the first signal comprises a duty cycle value, and the error state is loss of the first signal.
11. A fan control system configured for controlling a fan to operate and comprising:
a baseboard management controller (BMC);
a control module electrically connected to the BMC and the fan, and configured to receive a first signal outputted by the BMC and determine whether the BMC is in an abnormal state according to the first signal; wherein the error state is that level state of the first signal remains unchanged.
wherein when the BMC is in an abnormal state, the control module outputs a preset pulse width modulation (PWM) signal to the fan to keep continuous operation of the fan; and
wherein when the first signal is in an error state continuously within a preset number of cycles, the control module determines the BMC is in the abnormal state.
12. The fan control system of claim 11 , wherein when the BMC is in a normal state, the control module control module controls operation of the fan according to the first signal; wherein when the first signal is not in an error state continuously within a preset number of cycles, the control module determines the BMC is in the normal state.
13. The fan control system of claim 12 , wherein the control module further comprises a detection unit, a storage unit and a signal selection unit, the detection unit is electrically connected between the BMC and the signal selection unit to detect whether a level state of the first signal is continuously in the error state within the preset number of cycles, to output a second signal to the signal selection unit; the storage unit is electrically connected to the signal selection unit, the storage unit is configured to output the preset PWM signal to the signal selection unit; the BMC is electrically connected to the signal selection unit, the signal selection unit is configured to output the first signal to the signal selection unit; and the signal selection unit is electrically connected to the fan, and the signal selection unit selects to output the first signal or the preset PWM signal to the fan according to the second signal.
14. The fan control system of claim 13 , wherein when the detection unit detects the BMC is in the abnormal state according to the first signal, the detection unit outputs the second signal, and the second signal is in a first level state, the signal selection unit outputs the preset PWM signal to the fan according to the second signal; and when the detection unit detects the BMC is in the normal state according to the first signal, the detection unit outputs the second signal, and the second signal is in a second level state, the signal selection unit outputs the first signal to the fan according to the second signal.
15. The fan control system of claim 14 , wherein the first signal is a PWM signal.
16. The fan control system of claim 11 , wherein the control module further comprises a detection unit, a storage unit, a signal selection unit, a signal processing unit and a PWM signal generation unit, the detection unit is electrically connected between the BMC and the signal selection unit to detect whether a level state of the first signal is continuously in the error state within the preset number of cycles, to output a second signal to the signal selection unit; the signal processing unit is electrically connected between the BMC and the signal selection unit, the signal processing unit is configured to process the first signal to obtain a duty cycle of the first signal in each preset cycle and generate a third signal, and output the third signal to the signal selection unit; the storage unit is electrically connected to the signal selection unit, the storage unit is configured to output a preset adjustment signal to the signal selection unit; the signal selection unit is also electrically connected to the PWM signal generation unit, and the signal selection unit selects to output the third signal or the preset adjustment signal to the PWM signal generation unit according to the second signal; the PWM signal generation unit is electrically connected to the fan, the PWM signal generation unit is configured to generate a target PWM signal according to the third signal and outputting the target PWM signal to the fan, or the PWM signal generation unit is configured to generate the preset PWM signal according to the preset adjustment signal and output the preset PWM signal to the fan.
17. The fan control system of claim 16 , wherein when the detection unit detects the BMC is in the abnormal state according to the first signal, the detection unit outputs the second signal, and the second signal is in a first level state, the signal selection unit outputs the preset adjustment signal to the PWM signal generation unit according to the second signal; and when the detection unit detects the BMC is in the normal state according to the first signal, the detection unit outputs the second signal, and the second signal is in a second level state, the signal selection unit outputs the third signal to the PWM signal generation unit according to the second signal.
18. The fan control system of claim 17 , wherein the first signal is a PWM signal.
19. The fan control system of claim 17 , wherein the BMC is electrically connected to the signal processing unit through an integrated circuit bus, and the first signal comprises a duty cycle value, and the error state is loss of the first signal.
20. A fan control method configured for controlling a fan to operate and comprising:
receiving a first signal input by a baseboard management controller (BMC);
determining whether the first signal is in an error state continuously within a preset number of cycles;
outputting a preset pulse width modulation (PWM) signal to the fan;
controlling operation of the fan according to the first signal.
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