CN114109885A - Detection board, power converter and complete machine fan detection method and system - Google Patents
Detection board, power converter and complete machine fan detection method and system Download PDFInfo
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- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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Abstract
The invention provides a detection board, a power converter and a complete machine fan detection method and a complete machine fan detection system, wherein in the method, after the complete machine fan detection system receives pulse signals output by each fan in a complete machine, the pulse signals are subjected to one-by-one gating output with preset duration according to a preset period to generate time-sharing detected signals; that is, a time-sharing tested signal is used for bearing the part of each pulse signal in the preset duration, and the characteristics of each pulse signal are displayed in a time-sharing manner; then the complete machine fan detection system outputs the time-sharing detected signal to a detection port of the controller, namely the controller respectively judges whether the state of the corresponding fan is normal or not according to the signal in each preset time length of the time-sharing detected signal; and furthermore, only one detection port of the controller is occupied to realize the state detection of each fan, and the resource occupancy rate of the controller is reduced to the maximum extent.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a detection board, a power converter and a complete machine fan detection method and system.
Background
In a converter and an inverter, a fan is an important component of an air-cooled heat dissipation device of the converter and the inverter, and the reliability of the fan influences the stable operation of the whole machine. Meanwhile, the fan is also a vulnerable device, and if the fan cannot be detected to be damaged or not in the process of long-time on-site operation of the machine, the safe operation of the machine is threatened, and unnecessary economic loss is brought while the operation and maintenance cost is increased. Therefore, it is necessary to detect the state of the fan.
In the existing air cooling machine, fans with pulse output are applied in large quantity, and the conventional fan state detection scheme is that all fans used in the whole machine are subjected to frequency detection through a plurality of IO ports of a controller so as to judge the quality of each fan; however, in a high-power air-cooled machine, the number of fans is large, and the IO port is used to detect the frequency of each fan, which occupies a large amount of controller resources.
Disclosure of Invention
In view of this, the present invention provides a detection board, a power converter, and a method and a system for detecting a complete fan, so as to reduce the resource occupancy rate of a controller.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention provides a complete machine fan detection method in a first aspect, which comprises the following steps:
s101, a complete machine fan detection system receives pulse signals output by all fans in a complete machine;
s102, the complete machine fan detection system respectively carries out gating output of preset duration on each pulse signal one by one according to a preset period to generate a time-sharing detected signal;
s103, the complete machine fan detection system outputs the time-sharing detected signal to a detection port of a controller;
and S104, the controller respectively judges whether the state of the corresponding fan is normal according to the signals in each preset time length of the time-sharing detected signals.
Optionally, after step S101, the method further includes:
s201, shaping the period and the duty ratio of each pulse signal by the complete fan detection system;
step S102 is executed again.
Optionally, after step S102, the method further includes:
s202, the complete machine fan detection system performs level conversion and signal isolation on the time-sharing detected signal;
step S103 is executed again.
Optionally, after step S103, the method further includes:
s203, the controller judges whether the time-sharing detected signal changes according to the preset period, and signals exist in each preset duration of the preset period;
if yes, go to step S104; otherwise, the controller judges that the whole fan detection system has faults.
Optionally, after step S104, if the states of the fans are normal, the method further includes:
s301, the controller determines the rotating speed of each fan according to the signal of each fan within the preset time corresponding to each fan;
s302, the controller searches a preset corresponding relation table of the rotating speed and the residual life according to the rotating speeds to determine the residual life of each fan;
and S303, reporting a life early warning signal to the fan with the residual life less than or equal to the preset value by the controller.
The second aspect of the present invention also provides a detection board, including: a first chip selection circuit and a chip selection signal circuit;
the detection board is provided with at least two fan input ends which can respectively receive pulse signals output by corresponding fans in the whole machine;
each input end of the first chip selection circuit is respectively connected with the corresponding fan input end;
the control end of the first chip selection circuit is connected with the corresponding output end of the chip selection signal circuit;
the first chip selection circuit is used for carrying out one-by-one gating output of preset duration on the pulse signals of the input ends of the first chip selection circuit according to the corresponding control signals output by the chip selection signal circuit and a preset period, and the generated signals are used as time-sharing tested signals; and outputting the time-sharing detected signal to a detection port of a controller through a total output end on the detection board, so that the controller respectively judges whether the state of the corresponding fan is normal according to the signals in each preset period of the time-sharing detected signal.
Optionally, the method further includes: the shaping circuit is arranged between each fan input end and each input end of the first chip selection circuit and is used for shaping the period and the duty ratio of each pulse signal;
and/or the presence of a gas in the gas,
and the output driving circuit is arranged between the output end of the first chip selection circuit and the total output end and is used for carrying out level conversion and signal isolation on the time-sharing tested signal.
Optionally, the method further includes: and the first switch module is arranged between the fan input ends and is used for realizing the connection or disconnection between one fan input end and each other fan input end.
Optionally, the detection board further includes: a second chip select circuit; the detection board is also provided with a cascade output end and at least one cascade input end;
one input end of the second chip selection circuit is respectively connected with the cascade output end and the output end of the first chip selection circuit;
the other input ends of the second chip selection circuit are respectively connected with the cascade output ends of other detection boards through the corresponding cascade input ends;
the control end of the second chip selection circuit is connected with the corresponding output end of the chip selection signal circuit;
and the second chip selection circuit is used for gating the signals of the input ends of the second chip selection circuit one by one according to the corresponding control signals output by the chip selection signal circuit to output, and replacing the generated signals with the signals generated by the first chip selection circuit as the time-sharing tested signals.
Optionally, the method further includes: a second switch module;
the second switch module is arranged between the input ends of the second chip selection circuit and used for realizing connection or disconnection between the output end of the first chip selection circuit and the cascade input ends.
Optionally, the chip select signal circuit includes: a crystal oscillator circuit and at least two frequency divider circuits;
the crystal oscillator circuit is used for outputting an initial signal;
the frequency divider circuits are sequentially connected in series, the frequency divider circuit at the head end receives the initial signal, and the frequency divider circuits respectively generate a chip selection signal;
k adjacent chip selection signals are combined to form one control signal for controlling the corresponding chip selection circuit to realize 2-bit selectionkThe input terminals receive a strobe of the signal.
The third aspect of the present invention further provides a complete machine fan detection system, including: a detector plate as described in any of the preceding paragraphs for the first aspect; or, a master board and at least one slave board; wherein:
the slave board is the detection board as described in any one of the above paragraphs of the first aspect, and the input ends of the fans of the slave board can respectively receive pulse signals output by corresponding fans in the whole machine;
the slave board is used for respectively carrying out gating output of preset duration one by one on the pulse signals of the input ends of the slave board according to a preset period;
the master board is used for gating the signals output by the slave boards one by one to generate time-sharing tested signals; and outputting the time-sharing detected signal to a detection port of a controller, so that the controller respectively judges whether the state of the corresponding fan is normal according to the signal in each preset period of the time-sharing detected signal.
Optionally, the main board is the detection board including the second chip selection circuit in the first aspect, and is provided with: at least two of the fan inputs, at least one cascade input, a cascade output, and a total output;
each fan input end of the mainboard can respectively receive the pulse signal output by the corresponding fan;
each slave board is connected with the corresponding cascade input end of the master board through the cascade output end of the slave board;
the main output end of the main board is connected with a detection port of the controller.
Optionally, the slave plate and the master plate have the same structure.
A third aspect of the invention provides a power converter comprising: a housing, a power conversion module, a controller, a plurality of fans, and a complete fan detection system as described in any of the paragraphs above in the second aspect;
the power conversion module, the controller and the complete machine fan detection system are all arranged in the shell;
each fan is arranged on and/or in the shell respectively;
the complete machine fan detection system and the controller are used for jointly executing the complete machine fan detection method in any paragraph of the first aspect.
After the complete machine fan detection system receives the pulse signals output by each fan in the complete machine, the complete machine fan detection system respectively carries out gating output of preset duration on each pulse signal one by one according to a preset period to generate a time-sharing detected signal; that is, a time-sharing tested signal is used for bearing the part of each pulse signal in the preset duration, and the characteristics of each pulse signal are displayed in a time-sharing manner; then the complete machine fan detection system outputs the time-sharing detected signal to a detection port of the controller, namely the controller respectively judges whether the state of the corresponding fan is normal or not according to the signal in each preset time length of the time-sharing detected signal; and furthermore, only one detection port of the controller is occupied to realize the state detection of each fan, and the resource occupancy rate of the controller is reduced to the maximum extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart of a method for detecting a fan of a complete machine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pulse signal gating period in the complete machine fan detection method according to the embodiment of the present invention;
fig. 3 and fig. 4 are two other flow charts of the complete machine fan detection method according to the embodiment of the present invention, respectively;
fig. 5 and fig. 6 are schematic structural diagrams of a detection board according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a chip select signal circuit in the complete machine fan detection system according to the embodiment of the present invention;
FIG. 8 is a combination diagram of chip select signals according to an embodiment of the present invention;
fig. 9 and fig. 10 are schematic structural diagrams of a complete machine fan detection system according to an embodiment of the present invention;
fig. 11 is a schematic diagram of a signal gating period in the complete machine fan detection method according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention provides a complete machine fan detection method to reduce the resource occupancy rate of a controller.
As shown in fig. 1, the method for detecting a complete fan specifically includes:
s101, the complete machine fan detection system receives pulse signals output by all fans in the complete machine.
When the whole machine is an air cooling device with pulse output fans, the pulse signals output by the fans can be used for carrying out self state detection; in the prior art, for n fans, n IO ports of a controller need to be occupied for status detection, which undoubtedly causes an excessively high resource occupancy rate of the controller. However, after receiving the pulse signals of the fans, the present embodiment does not transmit the pulse signals to the corresponding IO ports of the controller, but executes step S102.
S102, the complete machine fan detection system respectively carries out gating output of preset duration on each pulse signal one by one according to a preset period to generate a time-sharing detected signal.
Assuming that the preset duration is t, fig. 2 shows a gating scheme for 16 pulse signals; wherein a high level indicates gated and a low level indicates ungated; as can be seen from fig. 2, the preset period T is 16T. That is, the generated time-sharing measured signals periodically change according to a preset period of m × t, wherein m is the number of pulse signals; in each preset period, the complete machine fan detection system gates all m pulse signals one by one according to a certain sequence, and further the generated time-sharing detected signals can display the pulse signals of the corresponding fans in a time-sharing manner.
Because each pulse signal is displayed only in the time period of the preset time t, in practical application, the selection of the preset time t takes the characteristics of the pulse signal which can be displayed and the detection of the state of the fan as the consideration standard; the value is not particularly limited, and is within the scope of the present application, depending on the application environment.
S103, the complete machine fan detection system outputs the time-sharing detected signal to a detection port of the controller.
In step S102, a time-sharing detected signal is used to carry the respective parts of the m pulse signals within the preset time duration, so that the time-sharing display of the characteristics of the m pulse signals can be realized, and therefore, only one IO port of the controller, that is, the detection port, needs to be occupied, so that the transmission of the m pulse signals to the controller can be realized.
And S104, respectively judging whether the state of the corresponding fan is normal or not by the controller according to the signals in each preset time length of the time-sharing detected signals.
Specifically, the fan rotating speed corresponding to each pulse signal can be respectively determined according to the signal in each preset time length of the time-sharing measured signal; then respectively judging whether the rotating speed of each fan exceeds the normal working rotating speed range (F1, F2), wherein F1 is less than F2; if the fan number exceeds the range, the state of the corresponding fan is judged to be abnormal, and the corresponding fan number is reported.
The working rotating speed range (F1, F2) and the fan number of each fan can be set in the debugging stage after the whole machine is installed; specifically, after the power is controlled on the whole machine, the controller may set the operating speed range (F1, F2) by detecting the fan pulse, and number each fan, such as 1 to 16 shown in fig. 2, although other numbering forms may be adopted in practical application, and the invention is not limited thereto.
The method for detecting the fan of the whole machine provided by the embodiment can bear the part of each pulse signal within the preset time length by using a time-sharing detected signal through the principle no matter what the number m of the pulse signals is, and further shows the characteristics of each pulse signal in a time-sharing manner; the larger m is, the longer the preset period T of the time-sharing detected signal is; however, no matter how long the preset period T is, only one detection port of the controller is occupied, and the signals in each preset time duration can be respectively judged by receiving the time-sharing detected signals, so that the state detection of the corresponding fan is realized, the resource occupancy rate of the controller is reduced to the maximum extent, and the fan state detection of the high-power air cooling machine is favorably realized.
In practical application, due to the fact that the duty ratio of the pulse signal output by the fan is large, for example, in a specific case, the high level time is about 22.4ms, and the low level time is about 0.6ms, the low level time is very short, and a very large filtering delay circuit is arranged in the controller, so that the low level of the us stage cannot be accurately detected; secondly, because the pulse signals output by the fan are transmitted to the fan detection system of the whole machine by long lines, for the weak-level transmission signals, the signals are greatly attenuated, and the signals are easily interfered; therefore, based on the previous embodiment, it is preferable that the method for detecting a complete fan provided by this embodiment performs step S201 first and then step S102 after step S101, as shown in fig. 3.
S201, shaping the period and the duty ratio of each pulse signal by the complete fan detection system.
Through step S201, the pulse signal transmitted by the fan to the complete machine fan detection system may be shaped, for example, and converted into a square wave signal with a duty ratio of 50% of two times the fan output pulse period, but is not limited thereto.
In addition, in the method for detecting a complete fan according to the above embodiment, after the step S102, the step S202 may be executed first, and then the step S103 may be executed, as shown in fig. 3.
S202, the complete machine fan detection system performs level conversion and signal isolation on the time-sharing detected signals.
In practical application, the isolation operational amplifier equipment can be adopted to perform level conversion and signal isolation on the time-sharing tested signal, so that mutual interference between board-level signals can be reduced.
On the basis of the above embodiment, it is preferable that, after the step S103, the method further includes the following steps as shown in fig. 4 (shown on the basis of fig. 3 as an example):
s203, the controller judges whether the time-sharing detected signal changes according to a preset period, and the signal exists in each preset duration of the preset period.
If yes, go to step S104. Otherwise, the controller judges the fault of the complete fan detection system.
At the moment, the complete machine fan detection method can also distinguish the fan fault and the detection system fault, and avoids influencing the reliability of the fan state detection result due to the detection system fault.
In addition, in practical application, a certain corresponding relation exists between the rotating speed of the fan and the residual service life of the fan, so that the corresponding relation can be detected to prepare a preset corresponding relation table and store the preset corresponding relation table in the controller in advance; further, after step S104, if the states of the fans are normal, the fan detection method further includes, as shown in fig. 4:
s301, the controller determines the rotating speed of each fan according to the signal of each fan within the corresponding preset time length.
The signal in each preset time duration is actually a part of the signal of the pulse signal output by the corresponding fan in the preset time duration; therefore, the rotation speed of the corresponding fan can be determined according to the signal, and the determination process is referred to the prior art, which is not described herein again.
S302, the controller searches in a preset corresponding relation table of the rotating speed and the residual service life according to the rotating speeds to determine the residual service life of each fan.
And S303, reporting a life early warning signal to the fan with the residual life less than or equal to the preset value by the controller.
The preset value can be determined according to the actual application environment, for example, the preset value can be half a year, 3 months and the like, and is within the protection scope of the application; if the residual service life is less than or equal to the preset value, the corresponding fan is about to be damaged or fail, and at the moment, the controller can report an early warning fault and prompt operation and maintenance personnel to replace the fan so as to ensure that the whole machine can operate at a proper temperature. That is, the complete machine fan detection method can realize the fault state detection of a plurality of fans, and can coordinate the complete machine to realize the prediction of fan faults and eliminate the fan faults before the occurrence of the fan faults.
Another embodiment of the present invention further provides a detection board, as shown in fig. 5, including: a first chip select circuit 101 and a chip select signal circuit (not shown); wherein:
the detection board is provided with at least two FAN input terminals (shown by taking 4 as an example in fig. 5, specifically FAN1, FAN2, FAN3, and FAN4 shown in fig. 5), which can respectively receive pulse signals output by corresponding FANs in the whole machine.
Respective input terminals (I shown in fig. 5) of the first chip selection circuit 10111、I12、I13And I14) Respectively connected with the corresponding input end of the fan.
The control terminal of the first chip select circuit 101 is connected to the corresponding output terminal of the chip select signal circuit, and receives the corresponding control signal.
The first chip selection circuit 101 is used for respectively carrying out gating output of preset duration on the pulse signals of the input ends of the first chip selection circuit one by one according to the corresponding control signals and the preset period, and using the generated signals as time-sharing detected signals; and OUTPUTs the time-sharing measured signal to a detection port (such as IN shown IN fig. 5) of the controller through the total OUTPUT terminal OUTPUT on the detection board, so that the controller respectively judges whether the state of the corresponding fan is normal according to the signals IN each preset period of the time-sharing measured signal.
The specific working principle of the detection board can be referred to the above embodiments, and is not described in detail herein. The method can also reduce the resource occupancy rate of the controller, and is favorable for realizing the fan state detection of the high-power air cooling machine. Moreover, no matter what type of machine the detection plate is applied to, the number of the fans is, and the fans are respectively located at what positions, the detection plate can be suitable, is high in applicability, and is beneficial to popularization and application.
Further, as shown in fig. 5, the detection board may further include: and a shaping circuit 103 provided between each fan input terminal and each input terminal of the first selection circuit 101, for shaping a cycle and a duty ratio of each pulse signal.
The shaping circuit 103 may specifically include two-stage shaping, where the one-stage shaping is to shape the input irregular square wave pulse signal into a regular square wave signal, and specifically may adopt a schmitt trigger to flip and shape the irregular square wave twice according to a threshold value of the schmitt trigger having high and low levels; the second-stage shaping can adopt a D trigger, the first-stage shaping result is sent to the CLK end of the D trigger, and the rising edge of the LCK end is detected, so that the period of the output waveform is two times of that of the CLK signal, and the duty ratio is 50%. In practical applications, the specific configuration of the shaping circuit 103 is not limited to this, and may be determined depending on the specific application environment, and may realize a shaping function for a pulse signal.
And/or, the detection board can also comprise: and the OUTPUT driving circuit 104 is arranged between the OUTPUT end of the first chip selection circuit and the total OUTPUT end OUTPUT and is used for carrying out level conversion and signal isolation on the time-sharing tested signal. Fig. 5 shows an example including both the shaping circuit 103 and the output driver circuit 104.
The detection board provided by the embodiment can realize simultaneous detection of multiple fans, for example, fig. 5 can realize simultaneous detection of at most 4 fans; only one IO port of the ARM is needed, and low resource occupancy rate is achieved. Moreover, the logic signal of the detection board is built by a hardware circuit, so that the cost is low, and hardware maintenance is not needed.
It should be noted that, if in practical application, the number of the FAN input ends of the detection board is large, and the FANs used in the complete machine are small, and all the FAN input ends cannot be fully connected, in consideration of the continuity of the output signal, a first switch module 105 may be added between the FAN input ends thereof to connect or disconnect one FAN input end (e.g., FAN1 shown in fig. 5) and the other FAN input ends (e.g., FAN2 to FAN4 shown in fig. 5). In practical applications, the first switch module may be disposed at a front stage or a rear stage of the shaping circuit 103, and the front stage is illustrated as an example in fig. 5.
The first switch module 101 can be specifically realized by a dial switch, and a port which is not connected with a fan is short-circuited to a port which is connected with the fan through the dial switch, so that the continuity of an output signal of a detection board can be ensured.
That is, the detection board can be applied only by adjusting the dial switch according to the number of different fans, and the hardware compatibility is strong; the software maintenance work is reduced, and the method can be adapted to various machine types.
On the basis of the above embodiment, if the number of fans installed in the complete machine is large, the number of fan input ends required to be arranged on the detection board is large, and the first chip selection circuit 101 also needs to be capable of realizing gating of more paths of signals; for the hardware design with multiple resource utilization, if all resources are integrated together, the design has a great defect, on one hand, the hardware size is inevitably larger, the whole machine installation is inconvenient, on the other hand, if part of the resources are damaged, the whole hardware needs to be replaced completely, and the hardware maintenance cost is greatly increased. Therefore, in practical application, a plurality of detection plate cascades can be arranged, and the plurality of detection plates can be conveniently maintained and replaced respectively through the discrete arrangement.
In order to realize the cascade connection among a plurality of detection boards, the specific structure of the detection board is based on the above embodiment, as shown in fig. 6, a second chip selection circuit 102 may be further added; and the detection board is also provided with a cascade output end OUTCascade connectionAnd at least one cascade input (IN each case IN fig. 6)Cascade connectionCarrying out unified display); specifically, the method comprises the following steps:
one input terminal (shown as I in FIG. 6) of the second chip select circuit 10221) Respectively connected to the cascade output terminals OUTCascade connectionAnd the output end of the first chip selection circuit is connected. The other input terminal (shown as I in FIG. 6) of the second chip select circuit 10222、I23And I24) And the detection channels are respectively connected with the cascade output ends of other detection boards through corresponding cascade input ends so as to expand the detection channels. The control terminal of the second chip select circuit 102 is connected to the corresponding output terminal of the chip select signal circuit, and receives the corresponding control signal.
And the second chip selection circuit 102 is used for gating the signals of the input ends thereof one by one according to the corresponding control signals and outputting the signals, so that the generated signals replace the signals generated by the first chip selection circuit 101 to be used as time-sharing detected signals.
That is, when the second chip selection circuit 102 is not provided, the signal generated and output by the first chip selection circuit 101 can be directly used as the time-sharing measured signal; when the second chip selection circuit 102 is additionally arranged and receives signals output by the first chip selection circuit 101 in the other detection boards, the signals output by the second chip selection circuit 102 to the signals output by the first chip selection circuits 101 are further gated to serve as the time-sharing detected signals, so that cascade connection among the detection boards is realized, and the number of detectable fans is increased.
Moreover, a second switch module 106 may be additionally disposed between the input ends of the second chip selection circuit 102, and is used for realizing connection or disconnection between the output end of the first chip selection circuit 101 and each cascade input end.
The second switch module 106 may be implemented by a dial switch, so as to ensure the continuity of the time-sharing measured signal.
In this case, the chip select signal circuit may be configured to generate control signals for the first chip select circuits 101 and the second chip select circuits 102 to control the first chip select circuits 101 and the second chip select circuits 102 to perform corresponding gating operations.
On the basis of the above embodiment, referring to fig. 7, the chip select signal circuit may specifically include: a crystal oscillator circuit 201 and at least two frequency divider circuits 202; wherein:
the crystal oscillator circuit 201 is used to output an initial signal.
The frequency divider circuits 202 are connected in series in turn, the frequency divider circuit 202 at the head end receives the initial signal, and then each frequency divider circuit 202 generates a chip select signal. Specifically, the frequency divider circuit 202 may utilize a dual D flip-flop shift function to perform signal frequency multiplication.
k paths of adjacent chip selection signals are combined to form a control signal for controlling the corresponding chip selection circuit to realize 2 pairs of chip selection circuitskThe input terminals receive a strobe of the signal. Taking the case shown in fig. 6 as an example, since the chip selection circuit chip adopts a scheme of 1-out-of-4, each chip selection circuit needs two chip selection signals; specifically, a frequency divider may be used to obtain the desired four-chip select signal. The combination result of the two chip select signals LCK2 and CLK3 of the first chip select circuit 101 and the combination result of the two chip select signals LCK4 and CLK5 of the second chip select circuit 102 are shown in fig. 8. Among them, chip select signals LCK2 and CLK3 are used to implement pulse signal gating of 4 fans (fan 1 to fan4 as shown in fig. 8) in a single sense board, and chip select signals LCK4 and CLK5 are used to implement output signal gating of each sense board (master board, slave board 1 to slave board 3 as shown in fig. 8) in cascade. The frequencies of the chip select signals in fig. 7 and 8 are only shown schematically, and are not limited to the situation shown in the figures, depending on the specific application environment.
Another embodiment of the present invention further provides a complete machine fan detection system, including a detection board as described in any of the above embodiments; the structure and principle of the detection board can be referred to the above embodiments, and are not described in detail here.
Alternatively, the complete machine fan detection system may also specifically include, as shown in fig. 9: one master board 10 and at least one slave board 20 (slave board 1, slave board 2 … shown in fig. 9, slave board N); wherein:
the board 20 is a pickup board as described in any of the above embodiments, and each FAN input terminal (FAN 1, FAN2 … FAN shown in fig. 9) can receive a pulse signal output by a corresponding FAN in the whole machine.
The slave board 20 is used for gating and outputting the pulse signals at the input ends of the slave board one by one for a preset time length according to a preset period; the main board 10 is used for gating the signals output by the slave boards 20 one by one to generate time-sharing tested signals; and outputs the time-sharing measured signal to the detection port (IN shown IN fig. 9) of the controller 30 (such as the ARM shown IN fig. 9), so that the controller 30 respectively determines whether the state of the corresponding fan is normal according to the signal IN each preset period of the time-sharing measured signal.
The specific working principle of the complete machine fan detection system can be referred to the above embodiments, and details are not repeated here. The method can also reduce the resource occupancy rate of the controller, and is favorable for realizing the fan state detection of the high-power air cooling machine. In addition, no matter what type of machine the complete machine fan detection system is applied to, the number of the fans is, and the fans are respectively located at what positions, the complete machine fan detection system is applicable, high in applicability and beneficial to popularization and application.
In practical applications, the second chip selection circuit 102 shown in fig. 6 does not need to be included inside each slave board 20, and the master board 10 does not need to receive pulse signals output by corresponding fans in the complete machine, but only gates the signals output by each slave board 20 one by one; however, it is more preferable that the master board 10 and each slave board 20 are designed to have the same structure, and the detection boards shown in fig. 6 are used, and the connection is realized through different ports, and the specific connection relationship can be seen in fig. 10, where fig. 10 shows that the sum of the numbers of the master board 10 and the slave boards 20 (such as the slave boards 1, 2 and 3 shown in fig. 6) is 4, and a single detection board detects 4 fans, and in this case, the system can detect 16 fan states at the same time.
As shown in fig. 10, the master plate 10 and the slave plate 20 are identical in structure, and each includes: at least two FAN inputs (4 shown IN fig. 10, specifically FAN1, FAN2, FAN3, and FAN4 shown IN fig. 10), at least one cascade input (IN fig. 10)Cascade connectionFor unified display), one cascade output terminal OUTCascade connectionAnd a global OUTPUT. Each fan input end of the main board 10 can also receive the pulse signal output by the corresponding fan in the whole machine; furthermore, each slave board 20 is connected to its own cascade output OUTCascade connectionConnecting corresponding cascade input ends of the main board 10; the general OUTPUT terminal OUTPUT of the main board 10 is connected to the detection port IN of the controller 30. For the structure of the master board 10 and the slave board 20, reference is made to the above embodiments, and details are not repeated here.
The specific working principle is as follows:
the duty ratio of the pulse signals received by the FAN input terminals FAN1, FAN2, FAN3 and FAN4 is relatively large, so the period and duty ratio of each pulse signal are shaped by the shaping circuit 103, for example, the pulse signals are converted into square wave signals with a duty ratio of 50% of twice the FAN output pulse period, but the invention is not limited thereto.
Then, the first chip selection circuit 101 inputs I to the respective input terminals I11、I12、I13And I14The received pulse signals are respectively subjected to one-by-one gating output with preset duration, and the generated signals are outputIs fed to the input terminal I of the second chip selection circuit 10221。
The other input terminal I of the second chip selection circuit 10222、I23And I24Will receive the respective slave board 20 through its cascade output OUT separatelyCascade connectionThe output signal; then, the second chip select circuit 102 will gate each input terminal I one by one21、I22、I23And I24Outputting the received signal to generate a time-sharing detected signal; the time-sharing measured signal is converted by the level conversion and signal isolation functions of the OUTPUT driving circuit 104, and meanwhile, mutual interference of board-level signals is reduced, and then the time-sharing measured signal is transmitted to the controller through the total OUTPUT end OUTPUT.
That is, in the complete machine fan detection system, the master board 10 and the slave board 20 are completely the same, but only the difference in definition is that the slave board 20 mainly uses the function of the cascade output thereof, and the master board 10 mainly uses the function of the cascade input thereof, and finally, the master board 10 outputs the time-sharing detected signal to the controller 30.
Taking the structures shown in fig. 6 and 10 as an example, a single detection board can simultaneously detect pulse signals of 4 fans, and only one fan outputs the pulse signals; the 4 detection boards only have one output, so the gating scheme is used for detecting the states of a plurality of fans, and the states of 16 fans can be detected at one time. The detection real-time performance requirement of the fan is not high, so that the scheme of gating detection is feasible. Assuming that the gating time of the single fan, that is, the preset time period is t, the gating detection period of the single detection board is 4t, and the cascaded gating detection period is 16 t. See fig. 11 in particular, where a high level indicates gated and a low level indicates ungated. Specifically, the preset time duration for each pulse signal of the input end of each first chip selection circuit 101 to gate each pulse signal, for example, any pulse signal corresponding to any one of groups of fan numbers 1 to 4, 5 to 8, 9 to 12, and 13 to 16 shown in fig. 11, is t; the second chip select circuit 102 in the motherboard 10 sequentially couples its corresponding input terminals (I in the motherboard shown in fig. 8)21In the main board I22In the main board I23And in the main board I24) The received output signal of the first chip selection circuit 101 is gatedOutputting, wherein the gating duration of the second chip selection circuit 102 for receiving signals at each input end is 4 t; the period of the finally generated time-sharing measured signal, which is the changing period T, is 16T. It can be seen that, in each preset period T, the whole fan detection system gates all 16 pulse signals one by one according to a certain sequence, so that the generated time-sharing detected signals can display the pulse signals of the corresponding fans in a time-sharing manner.
In practical application, the preset time t can be set to be millisecond level, and each detection board can be set to perform second level acquisition on the middle section of the corresponding pulse signal under the condition that each detection board is electrified simultaneously; but is not limited thereto and is within the scope of the present application depending on the specific application environment.
The complete machine fan detection system provided by the embodiment can realize simultaneous detection of multiple fans, for example, fig. 10 can realize simultaneous detection of 16 fans at most; only one IO port of the ARM is needed, and low resource occupancy rate is achieved. Moreover, through the multi-plate cascading scheme, independent maintenance of each detection plate can be achieved, the size is small, and installation is convenient.
It should be noted that the number of fans of various types in a general complete machine is not necessarily exactly equal to an integral multiple of the number of fan input ends on a detection board, taking the case shown in fig. 6 as an example:
fans of the same type may not be integral multiples of 4, which inevitably causes the input ends of 4 fans of a single detection board to be sometimes unsatisfied; therefore, the first switch module 105 described in the above embodiments may be added to its detection board; when the number of the fans connected with the single detection board is less than 4, the dial corresponding to the input end of the spare fan is closed, so that the pulse signal at the input end of the spare fan is the pulse signal input by the fan1, and the continuity of the pulse output by the single detection board is further ensured.
In addition, there is a possibility that the cascade 4-way detection board may be not fully connected, and in this case, the second switch module 106 described in the above embodiment may be added to the detection board; when the main board 10 has a vacant cascade input end, the corresponding dial is closed, so that the pulse signal of the vacant cascade input end is the signal output by the first chip selection circuit 101 in the main board 10; therefore, the continuity of cascade pulses, namely time-sharing tested signals, can be ensured, so that the time-sharing tested signals of one period output by the mainboard 10 at each time can be disassembled into 16 pulse signal groups with t as the period, the controller only needs to judge the signal pulse groups, the state detection of connecting fans of different models and numbers can be completed, and the software version is not required to be changed. The problem that different versions of software need to be maintained in the prior art is solved under the condition that different types of fans are different in number.
The complete machine fan detection system provided by the embodiment can realize the fault state detection of fans of different models, can provide corresponding fan numbers when the fans are in fault, and is suitable for rapidly finding out fault fans in multiple fan models. In addition, the cost is low, the logic signal is built by a hardware circuit, hardware maintenance is not needed, the logic signal can be realized by only adjusting a dial switch on a detection board according to different fan numbers, and the hardware compatibility is strong; the software maintenance work is reduced, and the method can be adapted to various machine types.
Another embodiment of the present invention further provides a power converter, including: the fan detection system comprises a shell, a power conversion module, a plurality of fans, a controller and the complete machine fan detection system according to any one of the embodiments; wherein:
the power conversion module, the controller and the complete machine fan detection system are all arranged in the shell; the power conversion module can be a DC/DC converter, a DC/AC/converter, an AC/DC converter or an AC/AC converter in any topological form, and is within the protection scope of the application; which is controlled by a controller. The structure and the working principle of the complete fan detection system can be obtained by referring to the above embodiments, and are not described in detail herein.
The fans are respectively arranged on and/or in the shell and used for realizing temperature control of devices inside the shell.
The complete machine fan detection system and the controller are used for jointly executing the complete machine fan detection method in any one of the embodiments, so that the fault state detection of fans of different types and the detection of the complete machine fan detection system can be realized; and moreover, the prediction of fan faults can be realized by coordinating the whole machine, and the fan faults can be eliminated before the occurrence of the fan faults.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. A complete machine fan detection method is characterized by comprising the following steps:
s101, a complete machine fan detection system receives pulse signals output by all fans in a complete machine;
s102, the complete machine fan detection system respectively carries out gating output of preset duration on each pulse signal one by one according to a preset period to generate a time-sharing detected signal;
s103, the complete machine fan detection system outputs the time-sharing detected signal to a detection port of a controller;
and S104, the controller respectively judges whether the state of the corresponding fan is normal according to the signals in each preset time length of the time-sharing detected signals.
2. The complete machine fan detection method according to claim 1, further comprising, after step S101:
s201, shaping the period and the duty ratio of each pulse signal by the complete fan detection system;
step S102 is executed again.
3. The complete machine fan detection method according to claim 1, further comprising, after step S102:
s202, the complete machine fan detection system performs level conversion and signal isolation on the time-sharing detected signal;
step S103 is executed again.
4. The complete machine fan detection method according to any one of claims 1 to 3, further comprising, after step S103:
s203, the controller judges whether the time-sharing detected signal changes according to the preset period, and signals exist in each preset duration of the preset period;
if yes, go to step S104; otherwise, the controller judges that the whole fan detection system has faults.
5. The complete machine fan detection method according to any one of claims 1 to 3, wherein after step S104, if the states of the fans are normal, the complete machine fan detection method further comprises:
s301, the controller determines the rotating speed of each fan according to the signal of each fan within the preset time corresponding to each fan;
s302, the controller searches a preset corresponding relation table of the rotating speed and the residual life according to the rotating speeds to determine the residual life of each fan;
and S303, reporting a life early warning signal to the fan with the residual life less than or equal to the preset value by the controller.
6. A detection board, comprising: a first chip selection circuit and a chip selection signal circuit;
the detection board is provided with at least two fan input ends which can respectively receive pulse signals output by corresponding fans in the whole machine;
each input end of the first chip selection circuit is respectively connected with the corresponding fan input end;
the control end of the first chip selection circuit is connected with the corresponding output end of the chip selection signal circuit;
the first chip selection circuit is used for carrying out one-by-one gating output of preset duration on the pulse signals of the input ends of the first chip selection circuit according to the corresponding control signals output by the chip selection signal circuit and a preset period, and the generated signals are used as time-sharing tested signals; and outputting the time-sharing detected signal to a detection port of a controller through a total output end on the detection board, so that the controller respectively judges whether the state of the corresponding fan is normal according to the signals in each preset period of the time-sharing detected signal.
7. The sensing plate of claim 6, further comprising: the shaping circuit is arranged between each fan input end and each input end of the first chip selection circuit and is used for shaping the period and the duty ratio of each pulse signal;
and/or the presence of a gas in the gas,
and the output driving circuit is arranged between the output end of the first chip selection circuit and the total output end and is used for carrying out level conversion and signal isolation on the time-sharing tested signal.
8. The sensing plate of claim 6, further comprising: and the first switch module is arranged between the fan input ends and is used for realizing the connection or disconnection between one fan input end and each other fan input end.
9. The detection panel of any one of claims 6 to 8, further comprising: a second chip select circuit; the detection board is also provided with a cascade output end and at least one cascade input end;
one input end of the second chip selection circuit is respectively connected with the cascade output end and the output end of the first chip selection circuit;
the other input ends of the second chip selection circuit are respectively connected with the cascade output ends of other detection boards through the corresponding cascade input ends;
the control end of the second chip selection circuit is connected with the corresponding output end of the chip selection signal circuit;
and the second chip selection circuit is used for gating the signals of the input ends of the second chip selection circuit one by one according to the corresponding control signals output by the chip selection signal circuit to output, and replacing the generated signals with the signals generated by the first chip selection circuit as the time-sharing tested signals.
10. The sensing plate of claim 9, further comprising: a second switch module;
the second switch module is arranged between the input ends of the second chip selection circuit and used for realizing connection or disconnection between the output end of the first chip selection circuit and the cascade input ends.
11. A patch according to any one of claims 6 to 8, wherein said chip select signal circuit includes: a crystal oscillator circuit and at least two frequency divider circuits;
the crystal oscillator circuit is used for outputting an initial signal;
the frequency divider circuits are sequentially connected in series, the frequency divider circuit at the head end receives the initial signal, and the frequency divider circuits respectively generate a chip selection signal;
k adjacent chip selection signals are combined to form one control signal for controlling the corresponding chip selection circuit to realize 2-bit selectionkThe input terminals receive a strobe of the signal.
12. A complete machine fan detecting system is characterized by comprising: a test plate according to any one of claims 6 to 11; or, a master board and at least one slave board; wherein:
the slave plate is a detection plate according to any one of claims 6 to 11, wherein the input end of each fan can respectively receive pulse signals output by the corresponding fan in the whole machine;
the slave board is used for respectively carrying out gating output of preset duration one by one on the pulse signals of the input ends of the slave board according to a preset period;
the master board is used for gating the signals output by the slave boards one by one to generate time-sharing tested signals; and outputting the time-sharing detected signal to a detection port of a controller, so that the controller respectively judges whether the state of the corresponding fan is normal according to the signal in each preset period of the time-sharing detected signal.
13. The complete machine fan detection system according to claim 12, wherein the main board is a detection board according to claim 9 or 10, on which: at least two of the fan inputs, at least one cascade input, a cascade output, and a total output;
each fan input end of the mainboard can respectively receive the pulse signal output by the corresponding fan;
each slave board is connected with the corresponding cascade input end of the master board through the cascade output end of the slave board;
the main output end of the main board is connected with a detection port of the controller.
14. The complete machine fan detection system according to claim 13, wherein the slave plate and the master plate are identical in structure.
15. A power converter, comprising: a housing, a power conversion module, a controller, a plurality of fans, and the complete machine fan detection system of any one of claims 12 to 14;
the power conversion module, the controller and the complete machine fan detection system are all arranged in the shell;
each fan is arranged on and/or in the shell respectively;
the whole fan detection system and the controller are used for jointly executing the whole fan detection method according to any one of claims 1 to 5.
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