CN103233904A - Fan state feedback control device and method thereof - Google Patents
Fan state feedback control device and method thereof Download PDFInfo
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- CN103233904A CN103233904A CN2013101757122A CN201310175712A CN103233904A CN 103233904 A CN103233904 A CN 103233904A CN 2013101757122 A CN2013101757122 A CN 2013101757122A CN 201310175712 A CN201310175712 A CN 201310175712A CN 103233904 A CN103233904 A CN 103233904A
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Abstract
The invention discloses a fan state feedback control device and a method thereof. The fan state feedback control device comprises an information acquisition judging circuit, a state signal output circuit and a state signal display circuit. The information acquisition judging circuit comprises a primary comparison circuit, a high-pass filtering circuit, a secondary comparison circuit and a frequency-voltage converting circuit. The primary comparison circuit enables a fan rotating speed input signal to be converted into a high-low level signal, the high-low level signal is output to the frequency-voltage converting circuit to perform frequency voltage conversion after experiencing high-pass filtering of the high-pass filtering circuit, a fixed voltage signal converted by frequency voltage is input in the secondary comparison circuit to be compared with a reference voltage to obtain a fan state signal, and the fan state signal is output to the state signal output circuit and the state signal display circuit to indicate fan states. The fan state feedback control device and the method of the fan state feedback control device overcome the defect that a microprocessor is needed for calculation and circuit cost is high in the prior art, achieve fan rotating speed monitoring through simple circuit structures, and are simplified in design, low in cost and free of maintenance.
Description
Technical field
The present invention relates to a kind of fan control device and method thereof, especially relate to a kind of fan-status feed back control system and method thereof that is applied to rail vehicles row control equipment, the present invention also can be applied to the fan-status feedback control of other similar field.
Background technique
Along with present railway row are controlled the complicated of device systems function, system's design level of integration becomes big, and a large amount of high density integrated circuits are widely used.But the space of train is limited, and equipment volume can not infinite extension, causes hardware density to improve constantly, and the whole heating value of equipment also increases substantially.Therefore, row control equipment common design on the train is by the radiating subassembly of being made up of various fans at present, and the fan radiating subassembly can provide unobstructed air channel for vehicle-mounted row control equipment, realizes active heat transfer, be equipment cooling to play, guarantee the effect of good running temperature environment.
Fan normally is made up of electric machine assembly and flabellum design, uses in business level to belong to attrition component.And along with the improving constantly of fan electromotor service life, may occur that rotating speed reduces even the phenomenon of stall.The state of fan self will have influence on the temperature quality of whole system running environment.Well behaved fan-status feedback control system can accomplish to make system in time to obtain the working state of radiation system and point out the user to handle, and is in good utilization temperature environment all the time with assurance equipment.Therefore, in real time, the fan-status monitoring requirements becomes the current technical problem that needs to be resolved hurrily efficiently.
And it is current, complicated along with marketization competition, systemic-function proposed new requirement again to monitoring system, and that designs exactly answers lightweight namely low-cost, non-maintaining, and should be in minimumly to the consumption of system, namely should guarantee at minimum state system handles pressure.It all is to adopt the technological scheme of processor (MCU/FPGA)+rotating speed Acquisition Circuit+feeder loop to form that a lot of schemes are arranged at present on the market.When design, need programme to MCU/FPGA, the rotation speed of the fan information that collects by the rotating speed Acquisition Circuit judges whether to meet the demands, and feeds back to system by feeder loop then.Present solution all needs to use processor, and to programme to processor, caused meaningless cost to promote thus, and factors such as the uncontrollability of program-code, processor speed, sample rate both can have influence on the efficient of equipment, may there be simultaneously the defective of code, causes work such as later stage upgrade maintenance.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of fan-status feed back control system and method thereof, having solved prior art need participate in calculating by microprocessor, the defective that circuit cost is high, realize the rotation speed of the fan monitoring by simple circuit configuration, really accomplished design simplification, low cost, non-maintaining.
In order to realize the foregoing invention purpose, the present invention specifically provides a kind of technic relization scheme of fan-status feed back control system, a kind of fan-status feed back control system comprises: information gathering decision circuitry, state signal output circuit and state signal display circuit.Described information gathering decision circuitry further comprises one-level comparison circuit, high-pass filtering circuit, secondary comparison circuit and frequency-voltage conversion circuit.Described one-level comparison circuit is converted to stable high-low level signal with the rotation speed of the fan input signal of voltage functuation, after described high-low level signal carries out the high-pass filtering processing through described high-pass filtering circuit, export described frequency-voltage conversion circuit again to and carry out the voltage to frequency conversion, import through the fixed voltage signal of voltage to frequency conversion and to obtain the fan-status signal after described secondary comparison circuit and reference voltage compare, described fan-status signal exports described state signal output circuit and state signal display circuit to, is used to indicate fan-status.
Preferably, described fan-status feed back control system comprises that N group information gathering decision circuitry is for detection of the rotation speed of the fan input signal corresponding with described information gathering decision circuitry more than the two-way, N 〉=2.Described state signal output circuit comprises N the voltage ratio corresponding with rotation speed of the fan input signal way than path, and described state signal display circuit comprises N the fan-status indicating circuit corresponding with rotation speed of the fan input signal way.
Preferably, the rotation speed of the fan input signal of described voltage functuation and one is relatively exported stable high-low level signal in the back to determining voltage signal through described one-level comparison circuit, the described determining voltage signal of giving is determined by the minimum pressure reduction of rotation speed of the fan input signal, and is obtained by electric resistance partial pressure by power supply circuits.
Preferably, described high-pass filtering circuit comprises capacitor C 1 and resistance R 2, and described capacitor C 1 is in parallel with resistance R 2, and the appearance value C of described capacitor C 1 is given by the following formula:
R is the resistance of resistance R 2 and the appearance resistance sum of capacitor C 1, and n is rotation speed of the fan.
Preferably, described state signal output circuit further comprises triode and relay, and described triode links to each other with the secondary comparison circuit output terminal of many groups of described information gathering decision circuitry respectively.When described information gathering decision circuitry is all exported high level, then described triode conducting, described relay adhesive is fed back a weak electric signal by the contact of described relay, or drags down a level signal that provides in the control gear, points out all fan works normal; In the output signal of the secondary comparison circuit of many groups of described information gathering decision circuitry, have one the tunnel to be low level, then described triode ends, cause described relay adhesive to disconnect, corresponding weak electric signal disconnects or level signal is elevated, and prompting has fan work unusual.
Preferably, the reference voltage Uc' of described secondary comparison circuit is determined by following formula:
Uc' ≈ V
0+ (V
1-V
0) * (1-exp
-t/R ' C '), wherein, V
0Be the initial voltage value on the electric capacity in the frequency-voltage conversion circuit, V
1Be the magnitude of voltage on the t moment electric capacity, t is the duration of charge, and R ' is the resistance value of resistance in the frequency-voltage conversion circuit, and C ' is the capacitance of electric capacity.
Preferably, the reference voltage Uc' of described secondary comparison circuit is less than or equal to 3.6V.
Preferably, described state signal display circuit comprises comparator and display unit, the corresponding described display unit of each transportation work style fan rotating speed input signal, high-low level and reference voltage Uc' according to the output of described information gathering decision circuitry compare, and the change output state makes display unit light or extinguish, when fan-status just often, corresponding display unit is lighted, and when fan-status was unusual, corresponding display unit extinguished.
The present invention also specifically provides a kind of technic relization scheme of fan-status feedback in addition, a kind of fan-status feedback, the fan-status feed back control system comprises: information gathering decision circuitry, state signal output circuit and state signal display circuit, described information gathering decision circuitry further comprises one-level comparison circuit, high-pass filtering circuit, secondary comparison circuit and frequency-voltage conversion circuit, and described controlling method may further comprise the steps:
(A): described one-level comparison circuit is converted to stable high-low level signal with the rotation speed of the fan input signal of voltage functuation;
(B): described high-pass filtering circuit carries out the high-pass filtering processing to the high-low level signal of described one-level comparison circuit output;
(C): described frequency-voltage conversion circuit will carry out the voltage to frequency conversion through the high-low level signal that high-pass filtering is handled, and output fixed voltage signal;
(D): import through the fixed voltage signal of voltage to frequency conversion and to obtain the fan-status signal after described secondary comparison circuit and reference voltage compare, described fan-status signal exports described state signal output circuit and state signal display circuit to, is used to indicate fan-status.
Preferably, the rotating speed control of described fan is changeed 800～1200.
By implementing a kind of fan-status feed back control system that the invention described above provides and the technological scheme of method thereof, have following technique effect:
(1) the invention solves prior art can only be by the expensive scheme of processor and rotating speed Acquisition Circuit, realize the monitoring of rotation speed of the fan by simple comparator and band-pass circuit, and can realize fan failure feedback of status function by the display unit of relay and equipment itself simultaneously;
(2) the present invention uses the two-way comparison circuit to form, the rotation speed of the fan pulse signal is converted to voltage signal to be compared, realize the rotation speed of the fan monitoring by the stop voltage signal amplitude, and pass through the fault feedback that another road comparator is realized display unit and relay weak electric signal, realized the mutual isolation between strong and weak electricity, reliable circuit and the unreliable circuit;
(3) The whole control device of the present invention need not the processor participation, need not programming, can calculate the mean free error time by hardware, has really realized low cost, non-maintaining, and has simplified system's design of device greatly.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technological scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the system architecture diagram of a kind of embodiment of fan-status feed back control system of the present invention;
Fig. 2 is the control procedure flow chart of a kind of embodiment of fan-status feedback of the present invention;
Fig. 3 is the circuit theory diagrams of a kind of embodiment information gathering of fan-status feed back control system of the present invention decision circuitry;
Fig. 4 is the oscillogram that a kind of embodiment rotation speed of the fan of fan-status feed back control system of the present invention calculates principle;
Fig. 5 is the circuit theory diagrams of a kind of embodiment state signal of fan-status feed back control system of the present invention output circuit;
Fig. 6 is the circuit theory diagrams of a kind of embodiment state signal of fan-status feed back control system of the present invention display circuit;
Among the figure: 1-information gathering decision circuitry, 2-state signal output circuit, 3-state signal display circuit, 10-one-level comparison circuit, 11-high-pass filtering circuit, 12-secondary comparison circuit, 13-frequency-voltage conversion circuit.
Embodiment
For quote and know for the purpose of, with the technical term that hereinafter uses, write a Chinese character in simplified form or abridge and be described below:
MCU:Micro Control Unit, microcontroller;
FPGA:Field Programmable Gate Array, i.e. field programmable gate array;
LED:Light Emitting Diode, light emitting diode;
ATP:Automatic Train Proteciton, train protection system also claims the train automatic protective system;
SMD:Surface Mounted Devices, surface mount;
F/V transducer: frequency;
For the purpose, technological scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technological scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment who obtains under the creative work prerequisite.
To shown in the accompanying drawing 6, provided the specific embodiment of a kind of fan-status feed back control system of the present invention and method thereof as accompanying drawing 1, the invention will be further described below in conjunction with the drawings and specific embodiments.
The embodiment of a kind of fan-status feed back control system shown in accompanying drawing 1 and accompanying drawing 3 comprises: information gathering decision circuitry 1, state signal output circuit 2 and state signal display circuit 3.Information gathering decision circuitry 1 further comprises one-level comparison circuit 10, high-pass filtering circuit 11, secondary comparison circuit 12 and frequency-voltage conversion circuit 13.Wherein, one-level comparison circuit 10 and secondary comparison circuit 12 adopt the LM139D comparator.One-level comparison circuit 10 is converted to stable high-low level signal with the rotation speed of the fan input signal of voltage functuation, after the high-low level signal carries out the high-pass filtering processing through high-pass filtering circuit 11, export frequency-voltage conversion circuit 13 again to and carry out the voltage to frequency conversion, import through the fixed voltage signal of voltage to frequency conversion and obtain the fan-status signal after secondary comparison circuit 12 compares with reference voltage.The fan-status signal exports state signal output circuit 2 and state signal display circuit 3 to, is used to indicate fan-status.
The information gathering decision circuitry 1 that the fan-status feed back control system comprises N group is for detection of the rotation speed of the fan input signal corresponding with information gathering decision circuitry 1 more than the two-way, N 〉=2.State signal output circuit 2 comprises N the voltage ratio corresponding with rotation speed of the fan input signal way than path, and state signal display circuit 3 comprises N the fan-status indicating circuit corresponding with rotation speed of the fan input signal way.As a kind of typical mode of execution, 1 fan unit block comprises 4 fans, and the fan-status feed back control system shown in the present embodiment comprises that specifically 4 groups of information gathering decision circuitry 1 are for detection of 4 tunnel the rotation speed of the fan input signal corresponding with information gathering decision circuitry 1.State signal output circuit 2 comprises the voltage ratio of 4 tunnel correspondences than path, and state signal display circuit 3 comprises 4 tunnel fan-status indicating circuits corresponding with rotation speed of the fan input signal way.
As shown in Figure 3, the rotation speed of the fan input signal Ua of voltage functuation and relatively exports stable high-low level signal in the back through one-level comparison circuit 10 for determining voltage signal Uc.Giving determining voltage signal Uc is that peak value is the free voltage value, electrical pulsing signal with certain dutycycle, and is obtained by electric resistance partial pressure by power supply circuits.Generally speaking, determined for determining voltage signal Uc by the minimum pressure reduction of rotation speed of the fan input signal, in the use data file of selected fan, can have a detailed description.
As a kind of typical mode of execution, the comparative result of one-level comparison circuit 10 outputs is transformed into signal Ub by the high-pass filtering circuit of being made up of capacitor C 1 and resistance R 2 11.The capacitor C 1 of high-pass filtering circuit 11 is in parallel with resistance R 2, and the minimum speed that limits fan is 1000(± 20%) change, the appearance value C of capacitor C 1 is given by the following formula:
As shown in Figure 4, among the figure, Us
HighBe output voltage high level, Us
LowBe the output voltage low level, the rotation speed of the fan formula is as follows:
The rotational frequency f=2 of fan * n/60Hz
Wherein, n is rotation speed of the fan.
The appearance value estimation equation of capacitor C 1 is as follows:
Wherein, C is the appearance value of capacitor C 1, and π gets resistance that 3.14, R is resistance R 2 and the electric capacity capacitive reactance sum of capacitor C 1, and f is the rotational frequency of fan.Wherein, the electric capacity capacitive reactance Xc of capacitor C 1 is the resistance value of the relative electric current of electric capacity: formula: Xc=1/(ω * C), ω is angular velocity, and C is the appearance value.Can be drawn the appearance value estimation equation (formula all uses international unit) of capacitor C 1 by above two formula:
Calculating can get, and the appearance value of capacitor C 1 is 0.048 μ F, and therefore, the appearance value that C1 is held in power taking is 0.047 μ F.
10 pairs of fan rotating speed signals output amplitudes of one-level comparison circuit limit, and the fan rotating speed signals that the fan unit block adopts is square signal, and high level fluctuates with rotating speed and the different of input voltage, and amplitude range is 2.5V～5V.In like manner, the low level amplitude range is 0V～0.4V, so the minimum pressure reduction of frequency signal is 2.1V.Because the fan-status feed back control system adopts the power supply circuits of 24V, therefore can pass through electric resistance partial pressure, and then obtain judging voltage U c.The reference voltage Uc' of secondary comparison circuit 12 is further determined by following formula:
Uc'≈V
0+(V
1-V
0)×(1-exp
-t/R′C′)
Frequency-voltage conversion circuit 13 further comprises capacitor C 2 and resistance R 3, wherein, and V
0Be the initial voltage value on the capacitor C 2, V
1Be the magnitude of voltage on the t moment capacitor C 2, t is the duration of charge, and R ' is the resistance value of resistance R 3, and C ' is the capacitance of capacitor C 2.
Rotation speed of the fan is higher than 1000 comparative results that change and is sent to the frequency-voltage conversion circuit of being made up of diode D1, capacitor C 2 and resistance R 3 13 and converts fixed voltage Ud to, and is delivered to secondary comparison circuit 12.Because the frequency that discharges and recharges of capacitor C 2 changes, by capacitor charge and discharge formula Uc' ≈ V
0+ (V
1-V
0) * (1-exp
-t/RC), can draw fan when rotating speed is 1000～2800 commentaries on classics, the approximate extents of one-level comparison circuit 10 output voltages is 3.4～5.0V(± 5%), be less than or equal to 3.6V and compare so get the reference voltage Uc ' of secondary comparison circuit 12, draw the fan-status signal.The output result is: when the rotating speed of fan is higher than 1000 commentaries on classics (containing 1000 changes), and secondary comparison circuit 12 output 24V high level; When the rotating speed of fan is lower than 1000 commentaries on classics, secondary comparison circuit 12 output 0V low levels.
As shown in Figure 5, state signal output circuit 2 further comprises triode Q9 and relay K 2, and triode Q9 links to each other with secondary comparison circuit 12 output terminals of multipacket message collection decision circuitry 1 respectively.State signal output circuit 2 is connected to triode Q9 jointly by 4 comparator outputs, and 4 comparators judge that respectively corresponding signal collection circuit output level is high level or low level.When information gathering decision circuitry 1 is all exported high level, then triode Q9 conducting, relay K 2 adhesives are fed back a weak electric signal by the contact of relay K 2, or dragging down a level signal that provides in the control gear, all fan works in the prompting fan unit block are normal; In gathering the output signal of secondary comparison circuit 12 of decision circuitry 1, multipacket message have one the tunnel to be low level, then triode Q9 ends, cause relay K 2 adhesives to disconnect, corresponding weak electric signal disconnects or level signal is elevated, and has fan work unusual in the prompting fan unit block.
As shown in Figure 6, state signal display circuit 3 further comprises comparator and display unit, the corresponding display unit of each transportation work style fan rotating speed input signal, high-low level and reference voltage Uc' according to 1 output of information gathering decision circuitry compare, change output state, make display unit light or extinguish.When fan-status just often, corresponding display unit is lighted, when fan-status was unusual, corresponding display unit extinguished.In this specific embodiment, comparator adopts a LM139D comparator chip, display unit adopts LED(Light Emitting Diode, light emitting diode) lamp, the corresponding LED lamp in each unit, compare according to high-low level and the reference voltage of gathering decision circuitry output, the change output state makes the LED lamp light or extinguish.
As shown in Figure 2, a kind of embodiment of fan-status feedback, the fan-status feed back control system comprises: information gathering decision circuitry 1, state signal output circuit 2 and state signal display circuit 3, information gathering decision circuitry 1 further comprises one-level comparison circuit 10, high-pass filtering circuit 11, secondary comparison circuit 12 and frequency-voltage conversion circuit 13, and controlling method may further comprise the steps:
(A): one-level comparison circuit 10 is converted to stable high-low level signal with the rotation speed of the fan input signal of voltage functuation;
(B): the high-low level signal of 11 pairs of one-level comparison circuits of high-pass filtering circuit, 10 outputs carries out high-pass filtering to be handled;
(C): frequency-voltage conversion circuit 13 will carry out the voltage to frequency conversion through the high-low level signal that high-pass filtering is handled, and output fixed voltage signal;
(D): obtain the fan-status signal after the fixed voltage signal input secondary comparison circuit 12 of process voltage to frequency conversion compares with reference voltage, the fan-status signal exports state signal output circuit 2 and state signal display circuit 3 to, is used to indicate fan-status.When the frequency comparative result meets the demands, light fan unit block LED lamp relay closes state signal; When the frequency comparative result does not meet the demands, extinguish fan unit block LED lamp relay off state signal.
As a kind of preferred implementation in the present embodiment rotating speed control of fan is changeed 800～1200.
For the calculating of rotation speed of the fan resonable degree, as: newly design a radiation system, be used for the hidden danger that the former heat radiation of improvement system causes the heat exchange deficiency easily.Former radiation system uses 2 ventilations to be 150m
3The fan of/h, wherein, the air quantity that AF provides for single fan, under the situation of not considering windage, the air quantity that two fan unit blocks can provide is:
AF
total0=4×AF=4×150m
3/h=600m
3/h
It is 170m that new design radiation system adopts 4 ventilations
3The fan of/h, under the situation of not considering windage, the air quantity that four fans can provide is:
AF
total1=8×AF=8×170m
3/h=1360m
3/h
If fan unit block ventilation arrives 600m
3Be unreasonable ventilation during/h, then under the situation of not considering windage, 4 fan mean speeds of new departure radiation system are reduced to 44% of rated speed, then enter " danger " state, and the ventilation of this moment may cause system's plate operating temperature too high.Formula is:
If rotation speed of the fan is S, new fan unit block fan's rated speed is S
New0, the hazardous condition rotating speed is S
New1, ventilation fan amount and rotating speed are in direct ratio, and scale factor is t, and it is as follows to obtain formula:
S
new1=t×S
new0=（AF
total0÷AF
total1）×100%×S
new0=600/1360×100%×2800=1260（RPM）
So control gear changes (± 20%), realistic demand with the rotating speed control of fan 1000.
The present invention is converted to voltage signal by the two-way comparison circuit with the rotational speed pulse signal of fan, compare with reference potential, being higher than reference potential, then to export fan-status good, and light the LED lamp of corresponding fan-status, be lower than reference potential and then extinguish corresponding LED lamp, by relay output radiation system status information, make system can obtain the radiation system status information in real time, thereby realize the function of rotation speed of the fan monitoring simultaneously.The present invention adopts the two-way comparison circuit, the rotation speed of the fan pulse signal is converted to voltage signal to be compared, realize the rotation speed of the fan monitoring by the stop voltage signal amplitude, and by another road comparator realization LED lamp of state signal output circuit 2 and the weak electric signal fault feedback of relay, realize the mutual isolation between strong and weak electricity, reliable circuit and the unreliable circuit.Whole device need not processor and participates in, and need not programming, can calculate the mean free error time by hardware, has really realized non-maintaining, purpose cheaply.The technological scheme that the specific embodiment of the invention is described can be monitored 4 fan state simultaneously, and makes restriction by the rotary speed information incoming frequency of 4 fans on 1 pair of fan unit block of 4 tunnel information gathering decision circuitry.When rotation speed of the fan is higher than limit value; the fan-status feed back control system is to ATP(Automatic Train Protection; train protection system; also claim the train automatic protective system) output state information; and lighted the LED lamp of each fan correspondence on the fan unit block by 4 line state signal display circuits 3; when the rotating speed of any one fan is lower than limit value; the fan-status feed back control system stops to ATP output state information; extinguish on the fan unit block LED lamp that should fan, thereby reach the purpose that fan-status is judged.
The present invention can also use the F/V transducer, carries out simple frequency-voltage transitions, as F/V conversion chips such as use LM2917, realizes function of the present invention.But use F/V transducer can't be realized the isolation between fan-status feed back control system fan test section and the signal acquisition part branch, and is low in Security.Simultaneously, comparator in the middle of the specific embodiment of the invention can use other any models comparator (as change 74 series of comparisons devices into by LM series of comparisons device, 2 road comparators change to 4 road comparators etc. mode), the capacitance kind device, as ceramic condenser being replaced by tantalum electric capacity, SMD(Surface Mounted Devices, surface mount) electric capacity is replaced by plug-in mounting electric capacity etc.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and other embodiments' difference that identical similar part is mutually referring to getting final product between each embodiment.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet is not in order to limit the present invention.Any those of ordinary skill in the art, under the situation that does not break away from spiritual essence of the present invention and technological scheme, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, be equal to replacements, equivalence changes and modify, all still belong in the scope that technical solution of the present invention protects.
Claims (10)
1. fan-status feed back control system, it is characterized in that, comprise: information gathering decision circuitry (1), state signal output circuit (2) and state signal display circuit (3), described information gathering decision circuitry (1) further comprises one-level comparison circuit (10), high-pass filtering circuit (11), secondary comparison circuit (12) and frequency-voltage conversion circuit (13), described one-level comparison circuit (10) is converted to stable high-low level signal with the rotation speed of the fan input signal of voltage functuation, after described high-low level signal carries out the high-pass filtering processing through described high-pass filtering circuit (11), export described frequency-voltage conversion circuit (13) again to and carry out the voltage to frequency conversion, the fixed voltage signal of process voltage to frequency conversion is imported and is obtained the fan-status signal after described secondary comparison circuit (12) compares with reference voltage, described fan-status signal exports described state signal output circuit (2) and state signal display circuit (3) to, is used to indicate fan-status.
2. a kind of fan-status feed back control system according to claim 1, it is characterized in that: described fan-status feed back control system comprises that N group information gathering decision circuitry (1) is for detection of the rotation speed of the fan input signal corresponding with described information gathering decision circuitry (1) more than the two-way, N 〉=2; Described state signal output circuit (2) comprises N the voltage ratio corresponding with rotation speed of the fan input signal way than path, and described state signal display circuit (3) comprises N the fan-status indicating circuit corresponding with rotation speed of the fan input signal way.
3. a kind of fan-status feed back control system according to claim 1 and 2 is characterized in that: the stable high-low level signal of output after the rotation speed of the fan input signal of described voltage functuation and gives determining voltage signal (Uc) the described one-level comparison circuit of process (10) relatively.
4. a kind of fan-status feed back control system according to claim 3, it is characterized in that: described high-pass filtering circuit (11) comprises capacitor C 1 and resistance R 2, and described capacitor C 1 is in parallel with resistance R 2, and the appearance value C of described capacitor C 1 is given by the following formula:
R is the resistance of resistance R 2 and the electric capacity capacitive reactance sum of capacitor C 1, and n is rotation speed of the fan.
5. according to claim 1,2, the described a kind of fan-status feed back control system of arbitrary claim in 4, it is characterized in that: described state signal output circuit (2) comprises triode (Q9) and relay (K2), described triode (Q9) links to each other with secondary comparison circuit (12) output terminal of many groups of described information gathering decision circuitry (1) respectively, when described information gathering decision circuitry (1) when all exporting high level, then described triode (Q9) conducting, described relay (K2) adhesive, a weak electric signal is fed back in contact by described relay (K2), or drag down a level signal that provides in the control gear, point out all fan works normal; In the output signal of the secondary comparison circuit (12) of many groups of described information gathering decision circuitry (1), have one the tunnel to be low level, then described triode (Q9) ends, cause described relay (K2) adhesive to disconnect, corresponding weak electric signal disconnects or level signal is elevated, and prompting has fan work unusual.
6. a kind of fan-status feed back control system according to claim 5, it is characterized in that: the reference voltage Uc' of described secondary comparison circuit (12) is determined by following formula:
Uc' ≈ V
0+ (V
1-V
0) * (1-exp
-t/R ' C '), wherein, V
0Be the initial voltage value on the electric capacity (C2) in the frequency-voltage conversion circuit (13), V
1Be the magnitude of voltage on the t moment electric capacity (C2), t is the duration of charge, and R ' is the resistance value of resistance (R3) in the frequency-voltage conversion circuit (13), and C ' is the capacitance of electric capacity (C2).
7. a kind of fan-status feed back control system according to claim 6, it is characterized in that: the reference voltage Uc' of described secondary comparison circuit (12) is less than or equal to 3.6V.
8. according to claim 1,2,4,6, the described a kind of fan-status feed back control system of arbitrary claim in 7, it is characterized in that: described state signal display circuit (3) comprises comparator and display unit, the corresponding described display unit of each transportation work style fan rotating speed input signal, high-low level and reference voltage Uc' according to described information gathering decision circuitry (1) output compare, change output state, make display unit light or extinguish, when fan-status just often, corresponding display unit is lighted, when fan-status was unusual, corresponding display unit extinguished.
9. fan-status feedback, it is characterized in that, the fan-status feed back control system comprises: information gathering decision circuitry (1), state signal output circuit (2) and state signal display circuit (3), described information gathering decision circuitry (1) further comprises one-level comparison circuit (10), high-pass filtering circuit (11), secondary comparison circuit (12) and frequency-voltage conversion circuit (13), and described controlling method may further comprise the steps:
(A): described one-level comparison circuit (10) is converted to stable high-low level signal with the rotation speed of the fan input signal of voltage functuation;
(B): described high-pass filtering circuit (11) carries out the high-pass filtering processing to the high-low level signal of described one-level comparison circuit (10) output;
(C): described frequency-voltage conversion circuit (13) will carry out the voltage to frequency conversion through the high-low level signal that high-pass filtering is handled, and output fixed voltage signal;
(D): the fixed voltage signal of process voltage to frequency conversion is imported and is obtained the fan-status signal after described secondary comparison circuit (12) compares with reference voltage, described fan-status signal exports described state signal output circuit (2) and state signal display circuit (3) to, is used to indicate fan-status.
10. a kind of fan-status feedback according to claim 9 is characterized in that: the rotating speed control of described fan is changeed 800～1200.
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| CN201310175712.2A CN103233904B (en) | 2013-05-13 | 2013-05-13 | A kind of fan-status feed back control system and method thereof |
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| CN201310175712.2A CN103233904B (en) | 2013-05-13 | 2013-05-13 | A kind of fan-status feed back control system and method thereof |
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| CN107605777A (en) * | 2016-07-11 | 2018-01-19 | 奇鋐科技股份有限公司 | fan detection system and method |
| CN109342761A (en) * | 2018-09-11 | 2019-02-15 | 陕西千山航空电子有限责任公司 | A kind of rotor monitor speed processor |
| CN109899310A (en) * | 2019-02-28 | 2019-06-18 | 苏州浪潮智能科技有限公司 | A kind of rotation speed of the fan detection method, system, equipment and computer storage medium |
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| Publication number | Publication date |
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| CN103233904B (en) | 2015-12-02 |
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