CN205383099U - Radiator fan's fault detection device and heat abstractor - Google Patents
Radiator fan's fault detection device and heat abstractor Download PDFInfo
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- CN205383099U CN205383099U CN201620198352.7U CN201620198352U CN205383099U CN 205383099 U CN205383099 U CN 205383099U CN 201620198352 U CN201620198352 U CN 201620198352U CN 205383099 U CN205383099 U CN 205383099U
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Abstract
An embodiment of the utility model provides a radiator fan's fault detection device and heat abstractor, radiator fan's fault detection device includes: the voltage signal detection circuit, PWM signal generation circuit and the controller that connect gradually, wherein, the input of voltage signal detection circuit inserts among radiator fan's the power supply loop, the PWM signal generation circuit is used for the basis the detected voltage signal of voltage signal detection circuit output generates the PWM signal, the controller is used for the basis the duty cycle of PWM signal is confirmed radiator fan's fault type. The utility model discloses a radiator fan's fault detection device and heat abstractor, realized accurate, fast to radiator fan's fault detection, and circuit structure is simple, with low costs, the commonality is strong.
Description
Technical field
This utility model relates to fault detection technique field, particularly relates to failure detector and the heat abstractor of a kind of radiator fan.
Background technology
Existing power electronic equipment, owing to self having not low loss, therefore, needs commonly used radiator fan that equipment is cooled down.For the electrical control cubicles of wind power generating set (hereinafter referred to as unit), electrical control cubicles applies all kinds of electronic device such as converter, solid-state relay, transformator, rectification module etc. so that in-cabinet temperature is more and more higher.Too high temperature can reduce the service life of electronic device, even causes damage.Have influence on operation and the availability of unit further.Namely common method is use radiator fan to dispel the heat, so that in-cabinet temperature is maintained in range of normal value.
But, owing to a variety of causes can cause that radiator fan fault, common radiator fan fault have open circuit, stall, aging, deficient lubrication etc..Radiator fan fault can make automatically controlled in-cabinet temperature raise, and then affects unit safety operation.Therefore, the fault detect tool of radiator fan is of great significance.Currently for the detection of radiator fan fault, mainly there is following four method: one is select fan with alarm functions；Two is that the rotating speed to fan detects；Three is the current value gathering fan, judges that whether fan running is normal by the size of current value；Four is use sampled voltage and reference voltage to compare, and output switch amount is reported to the police.
But, above-mentioned four kinds of methods have following weak point: first, and the fan price in first method is higher, are only capable of whether fan is rotated detecting；Secondly, though second method can realize fan failure is detected, but speed measuring device need to be increased, need fan to be transformed or selects to carry rotating speed output function fan so that cost raises simultaneously；Again, the third method need to increase A/D acquisition function in circuit to realize the collection of current value, and needs to use embedded chip to carry out calculation process.Further, since fan type is different, time properly functioning, current value may be different, so after fan type changes, need to change embedded chip program or alarm parameters.If not using embedded chip, and adopting master controller directly to gather, needing again to increase analog measurement passage, these all can increase complexity and the cost of device；Finally, owing to the rated current of different fans is different in the 4th kind of method, so after fan type change, the parameter of electronic device also to change therewith so that the method versatility is not strong.Additionally, reference voltage choose comparatively difficulty, choose high value, be only capable of detection fan whether stall, it is also possible to cause fault to fail to judge, and choose lower value, once electric current, magnitude of voltage drift about, it is easy to generation error detection.
Utility model content
The purpose of this utility model embodiment is in that, it is provided that the failure detector of a kind of radiator fan and heat abstractor, to realize fault detect to radiator fan accurately and rapidly, and simple in construction, cost is low, highly versatile.
For realizing above-mentioned utility model purpose, embodiment of the present utility model provides the failure detector of a kind of radiator fan, including: voltage signal testing circuit, pwm signal generative circuit and the controller being sequentially connected with, wherein, the input of described voltage signal testing circuit accesses in the current supply circuit of radiator fan；Described pwm signal generative circuit is for generating pwm signal according to the detectable voltage signals of described voltage signal testing circuit output, and described controller for determining the fault type of described radiator fan according to the dutycycle of described pwm signal.
Preferably, described voltage signal testing circuit includes sampling resistor and the amplifying circuit of parallel connection, and wherein, described sampling resistor accesses in the current supply circuit of described radiator fan, and the outfan of described amplifying circuit connects described pwm signal generative circuit.
Preferably, described pwm signal generative circuit includes ramp signal generative circuit and comparison circuit, wherein, the outfan of described ramp signal generative circuit is connected with the input of described comparison circuit respectively with the outfan of described amplifying circuit, and the outfan of described comparison circuit is connected with described controller.
Preferably, described amplifying circuit includes: amplifier, the first resistance and the second resistance；The in-phase input end of described amplifier is connected with described radiator fan and by described sampling resistor ground connection；The inverting input of described amplifier connects the outfan of described amplifier by described first resistance, and by described second resistance eutral grounding；The outfan of described amplifier is the outfan of described amplifying circuit.
Preferably, described ramp signal generative circuit includes: intervalometer, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and audion；The power end of described intervalometer described 3rd resistance, the 4th resistance and the second capacity earth by being sequentially connected with；The trigger input of described intervalometer, threshold value end and discharge end pass through described second capacity earth；The control end of described intervalometer passes through described first capacity earth；One end of described 5th resistance connects the node between described 4th resistance and described second electric capacity, and the other end is connected with the base stage of described audion；The colelctor electrode of described audion and the first DC source are connected；The emitter stage of described audion passes through described 6th resistance eutral grounding, and connects the node between described 3rd resistance and the 4th resistance by described 3rd electric capacity.
Preferably, described comparison circuit includes comparator and the 7th resistance, and the inverting input of described comparator is connected with the emitter stage of described audion；The in-phase input end of described comparator connects the outfan of described amplifying circuit, and is connected the outfan of described comparison circuit by described 7th resistance.
Preferably, described failure detector also includes: be connected on the 8th resistance between the outfan of described controller and described comparison circuit.
Embodiment of the present utility model additionally provides a kind of heat abstractor, including: the failure detector of radiator fan and radiator fan as in the foregoing embodiment, described radiator fan electrically connects with the failure detector of described radiator fan.
The failure detector of the radiator fan that this utility model embodiment provides and heat abstractor, the detectable voltage signals exported according to voltage signal testing circuit by pwm signal generative circuit generates pwm signal, determine the fault type of radiator fan further according to the dutycycle of the pwm signal generated by controller, it is achieved thereby that fault detect to radiator fan accurately and rapidly, and circuit structure is simple, cost is low, it is adaptable to the fault detect of various types of radiator fans.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the failure detector of the radiator fan of this utility model embodiment one；
Fig. 2 is another structured flowchart of the failure detector of the radiator fan of this utility model embodiment two；
Fig. 3 is the waveform diagram of the ramp voltage signal of this utility model embodiment two, the voltage signal of once-through type radiator fan and pwm signal；
Fig. 4 is the waveform diagram of the ramp voltage signal of this utility model embodiment two, the voltage signal of AC type radiator fan and pwm signal；
Fig. 5 is the circuit structure diagram of the failure detector of the radiator fan of this utility model embodiment three.
Detailed description of the invention
It is described in detail below in conjunction with the accompanying drawing failure detector to this utility model embodiment radiator fan and heat abstractor.
Embodiment one
Fig. 1 is the structured flowchart of the failure detector of the radiator fan of this utility model embodiment one.With reference to Fig. 1, the failure detector of radiator fan includes the voltage signal testing circuit 110, pwm signal generative circuit 120 and the controller 130 that are sequentially connected with, and wherein, the input of voltage signal testing circuit 110 accesses in the current supply circuit of radiator fan；Pwm signal generative circuit 120 is for generating pwm signal according to the detectable voltage signals of voltage signal testing circuit 110 output, and controller 130 for determining the fault type of radiator fan according to the dutycycle of pwm signal.
In concrete implementation mode, controller 130 gathers high level and low level duration in the waveform of this pwm signal, thus calculating dutycycle.The computing formula of dutycycle is the cycle divided by the pwm signal waveform time being in high level.When radiator fan is properly functioning, dutyfactor value is less value；After radiating fan rotation speed is slack-off, dutycycle can become larger.When dutycycle is close to 1, it was shown that radiator fan stall, the situation of stall is usually that the axle is worn, or fan is seized by foreign body；When the relative normal value of dutycycle goes out greatly a lot (as more than normal value three times), it was shown that the aging or deficient lubrication of radiator fan, namely because aging or deficient lubrication, cause that rotating speed is slack-off, but still be rotary.It should be noted that in actual applications, dutycycle tapers into the open circuit generally referred to after short circuit, and this process, than very fast, generally can soon result in open circuit after short circuit.Thus when dutycycle is close to 0, it was shown that radiator fan internal break.Open circuit be exactly in radiator fan loop current value close to 0, now need to get rid of radiator fan situation about not starting because when radiator fan working power is not switched on, the current value measured also is 0.
The failure detector of the radiator fan that this utility model embodiment provides, the detectable voltage signals exported according to voltage signal testing circuit by pwm signal generative circuit generates pwm signal, determine the fault type of radiator fan further according to the dutycycle of the pwm signal generated by controller, it is achieved thereby that fault detect to radiator fan accurately and rapidly, and circuit structure is simple, cost is low, it is adaptable to the fault detect of various types of radiator fans.
Embodiment two
Fig. 2 is another structured flowchart of the failure detector of the radiator fan of this utility model embodiment two, can be considered a kind of specific implementation of Fig. 1 shown device embodiment.With reference to Fig. 2, compare the apparatus structure of embodiment illustrated in fig. 1, Fig. 2 particularly illustrates the specific implementation of voltage signal testing circuit and the specific implementation of pwm signal generative circuit.
With reference to Fig. 2, voltage signal testing circuit 110 includes sampling resistor 201 and the amplifying circuit 202 of parallel connection, and wherein, sampling resistor 201 accesses in the current supply circuit of radiator fan, and the outfan of amplifying circuit connects pwm signal generative circuit.
Pwm signal generative circuit 120 includes ramp signal generative circuit 203 and comparison circuit 204, wherein, the outfan of ramp signal generative circuit 203 is connected with the input of comparison circuit 204 respectively with the outfan of amplifying circuit 202, and the outfan of comparison circuit 204 is connected with controller 130.
The principle of the structured flowchart of the failure detector of radiator fan as shown in Figure 2 described further below.Shown in relational expression such as following formula (1) between motor speed and the electric current of radiator fan:
Wherein, n is motor speed, and U is armature voltage, and I is armature supply, and R is the resistance of armature circuit, and L is armature inductance,Being magnetic flux, K is induction electric potential constant.
From formula (1) it can be seen that armature voltage one timing, motor speed is more low, and electric current is more big, therefore, the size of current of detection radiator fan, just can reflect the speed conditions of radiator fan, thus the running status of radiator fan is judged.
With reference to Fig. 2, due to sampling resistor 201 and Cascaded radiator fan, the size of current of detection radiator fan just can convert the size of current of detection sampling resistor 201 to.Furthermore, the resistance of sampling resistor 201 is certain, and magnitude of voltage obtains current value divided by resistance value, because voltage and current is directly proportional so that the size of current of detection sampling resistor 201 can convert again the voltage swing of detection sampling resistor 201 to.It is to say, the voltage of the sampling resistor 201 by detecting goes the size of current of reflection radiator fan, thus judging the fault of radiator fan.In actual applications, sampling resistor 201 generally selects resistance to be 0.1 ohm, and power is the resistance of 10W.
Thus, amplifying circuit 202, by the voltage amplification on sampling resistor 201, reaches the discernible voltage range of comparison circuit 204.Ramp signal generative circuit 203 is used for producing ramp voltage signal.The ramp voltage signal that the detectable voltage signals amplified by amplified circuit 202 and ramp signal generative circuit 203 produce is input in comparison circuit 204, if the voltage after amplifying is higher than ramp voltage, comparison circuit 204 exports high level, if the voltage after amplifying is lower than ramp voltage, comparison circuit 204 output low level, thus produces the pwm signal of certain dutycycle.According to the dutycycle of this pwm signal, controller 130 is determined how the fault type of radiator fan, concrete fault type are determined and is described in previous embodiment one, do not do tired stating at this.It should be noted that the excursion of ramp voltage is 0V～7V, voltage range is very wide so that accidental electric current, the drift of voltage will not cause error detection.
The type of the power supply according to radiator fan is different, and radiator fan can be divided into once-through type and AC type, separately below for once-through type radiator fan, AC type radiator fan, and in conjunction with the accompanying drawings.
Fig. 3 is the waveform diagram of the ramp voltage signal of this utility model embodiment two, the voltage signal of once-through type radiator fan and pwm signal.For the master controller of unit, master controller passes through DI passage (digital quantity input signal channel) and gathers the signal condition of pwm signal as shown in Figure 3, and according to high level and low level duration computed duty cycle.Dutycycle can reflect rotating speed or the current situation of radiator fan.The fault type of radiator fan is determined further according to dutycycle.
In actual applications, also in the host controller fault pre-alarming scope, fault alarm threshold value can be carried out general setting.Such as, the rated current of the DC fan that conventional 24V powers is 0.3A, sampling resistor is resistance is 0.1 ohm, power is the resistance of 10W, then the magnitude of voltage on sampling resistor is 0.05V, and this magnitude of voltage is amplified 40 times, and the voltage obtained is 1.2V, if the ramp voltage signal peak that ramp signal generative circuit 203 generates is about 7V, then now dutycycle is 1.2/7=0.17.When radiator fan due to aging, owe the reason rotating speed such as lubrication slack-off time, electric current becomes big, and dutycycle rises, if electric current rises 3 times, then when dutycycle is more than 0.51 it is believed that radiator fan has started to abnormal conditions occur, therefore fault pre-alarming scope can be set to about 0.6～0.7.When radiator fan stall, electric current becomes much larger, and dutycycle close to 1, thus can arrange fault alarm threshold value.Largely ensure that automatically controlled in-cabinet temperature maintains in range of normal value, protect electronic device in electrical control cubicles.Meanwhile, radiator fan fault can be avoided to cause the unit disorderly closedown that electrical control cubicles temperature is too high and causes.
Except can being amplified by amplifying circuit 202 except DC voltage, the alternating voltage of low amplitude value also can be amplified by amplifying circuit 202.Fig. 4 is the waveform diagram of the ramp voltage signal of this utility model embodiment two, the voltage signal of AC type radiator fan and pwm signal.With reference to Fig. 4, when voltage after amplification is higher than ramp voltage, comparison circuit 204 exports high level, when voltage after amplification is lower than ramp voltage, comparison circuit 204 output low level, so the first half of the pwm signal waveform of comparison circuit 204 output is the cycle is the square-wave signal of 20ms, frequency is 50Hz；Latter half is 0V.The signal frequency that DI passage capable of being collects is 100Hz to the maximum, gathers requirement so meeting on hardware.The scan period of master controller is 20ms, from master controller scan period and four scan periods it can be seen that each scan period of master controller can collect high level signal.Master controller often collects a high level signal, just counting is once, after 1.5 seconds oblique wave cycles arrived, it is multiplied by time scan period 20ms by the counts of high level, as high level time, with high level time divided by oblique wave cycle 1500ms, draw the dutycycle that AC type radiator fan runs, carry out the counting statistics in next cycle afterwards again.
Additionally, when radiator fan is properly functioning, it is possible to automatically gathered dutyfactor value record by master controller, as the normal duty cycle value of this radiator fan.Concrete setting steps is as follows: when electrical control cubicles is debugged for the first time, check when whether radiator fan function is normal, man-machine interface (HumanMachineInterface can be passed through, HMI) picture arranges initialization dutycycle function, namely run radiator fan, it is ensured that after radiator fan normal operation, press HMI button, then master controller computed duty cycle record preservation, as the reference value run later.When just starting due to radiator fan, electric current is slightly larger, and reaching rated speed after current can diminish.So needing early warning is processed to add certain time delay.Additionally, radiator fan is generally by main controller controls, it starts, stops, and master controller can also can add " radiator fan startup " this Rule of judgment in dutycycle judges.
The failure detector of the radiator fan that this utility model embodiment provides, on the basis of previous embodiment, also has the following technical effect that
On the one hand, simple in construction and cost are low, it is not necessary to gather the concrete numerical value of voltage, electric current, carry out calculation process without using embedded software, so that it may detect radiator fan short circuit, open circuit, stall, owe various faults such as lubricating, aging；
On the other hand, owing to have employed ramp voltage computed duty cycle, and the excursion of ramp voltage is very wide, and therefore, accidental electric current, the drift of voltage will not cause error detection；
Another aspect, general for AC type, once-through type radiator fan, only need to change the amplification of amplifying circuit.For the radiator fan of same power supply type, even if model changes, without the parameter of electronic device in amendment circuit, meanwhile without the software in amendment controller.
Embodiment three
Fig. 5 is the circuit structure diagram of the failure detector of the radiator fan of this utility model embodiment three, can be considered a kind of specific implementation of Fig. 2 shown device embodiment.With reference to Fig. 5, compare the apparatus structure of embodiment illustrated in fig. 2, Fig. 5 particularly illustrates the specific implementation of amplifying circuit, the specific implementation of ramp signal generative circuit, and the specific implementation of comparison circuit；Further, between controller and comparison circuit, increase by the 8th resistance.
With reference to Fig. 5, amplifying circuit 202 includes: amplifier the 301, first resistance 302 and the second resistance 303；The in-phase input end of amplifier 301 is connected with radiator fan and by sampling resistor 201 ground connection；The inverting input of amplifier 301 connects the outfan of amplifier 301 by the first resistance 302, and by the second resistance 303 ground connection；The outfan of amplifier 301 is the outfan of amplifying circuit 202.
Specifically, the input that node is voltage signal testing circuit 110 between in-phase input end and one end of sampling resistor 201 of amplifier 301, node between one end of first resistance 302 and one end of the second resistance 303 is connected the inverting input of amplifier 301, the other end of sampling resistor 201, node ground connection between the other end and the negative power end of amplifier 301 of the second resistance 303, the positive power source terminal of amplifier 301 and the first DC source (as illustrated in the drawing+12V) are connected, the outfan that node is voltage signal testing circuit 110 between the other end and the outfan of amplifier 301 of the first resistance 302.
In concrete implementation mode, the amplifier 301 in amplifying circuit 202 can be selected for the operational amplifier such as model OPA4228.OPA4228 is a kind of high-precision operational amplifier chip of dual power supply, power supply voltage range width, it is allowed to the voltage range of input reaches as high as 36V.Therefore, can directly use the power supply of 12V, so may amplify the signal to maximum 12V.It is aforementioned it is stated that the scope of ramp voltage signal is at 0～7V; for the ease of detectable voltage signals and ramp voltage signal contrast; within voltage after amplification can being limited in 7V; the distorted signals that high-amplification-factor causes can be reduced so on the one hand, protect the electronic device in comparison circuit 204 below on the other hand.
Formula Vout=Vin* (R1+R2)/R2 according to amplifier in the same direction, it can be seen that adjust the resistance of resistance R1, just can change the amplification of amplifier.Once-through type radiator fan electric current is less, it is possible to selecting higher amplification, AC type radiator fan electric current is bigger, it is possible to select relatively low amplification.Here, the first resistance 302 in the present embodiment is equivalent to the R1 in formula, and the second resistance 303 in the present embodiment is equivalent to the R2 in formula.Thus, it is only necessary to change the resistance of the first resistance 302, just can be suitably used for the radiator fan of another kind of power supply type.For the fan of same power supply type, for the 24V once-through type radiator fan powered, owing to fan model or manufacturer are different, rated current is generally different.When detecting the radiator fan of different model, the hardware in device described in the present embodiment need not change.It addition, after arranging slightly wider scope on software parameter, such software parameter is also substantially without change.
Referring now still to Fig. 5, ramp signal generative circuit 203 includes: intervalometer the 304, the 3rd resistance the 305, the 4th resistance the 306, the 5th resistance the 307, the 6th resistance the 308, first electric capacity the 309, second electric capacity the 310, the 3rd electric capacity 311 and audion 312；The power end of intervalometer 304 the 3rd resistance the 305, the 4th resistance 306 and the second electric capacity 310 ground connection by being sequentially connected with；The trigger input of intervalometer 304, threshold value end and discharge end pass through the second electric capacity 310 ground connection；The control end of intervalometer 304 passes through the first electric capacity 309 ground connection；One end of 5th resistance 307 connects the node between the 4th resistance 306 and the second electric capacity 310, and the other end is connected with the base stage of audion 312；The colelctor electrode of audion 312 and the first DC source are connected；The emitter stage of audion 312 passes through the 6th resistance 308 ground connection, and connects the node between the 3rd resistance 305 and the 4th resistance 306 by the 3rd electric capacity 311.
nullSpecifically，Node and the first DC source between one end of 3rd resistance 305 and the power end (VCC) of intervalometer 304 are connected，Node and one end of the 3rd electric capacity 311 between the other end and one end of the 4th resistance 306 of 3rd resistance 305 are connected，The trigger input (TR) of intervalometer 304、Node between threshold value end (TH) and discharge end (DC)，The other end with the 4th resistance 306、Node between one end and one end of the second electric capacity 310 of 5th resistance 307 is connected，The other end of the 5th resistance 307 is connected with the base stage of audion 312，The colelctor electrode of audion 312 and the first DC source are connected，The control end (CV) of intervalometer 304 is connected with one end of the first electric capacity 309，The other end of the first electric capacity 309、The earth terminal (GND) of intervalometer 304、Node ground connection between the other end and one end of the 6th resistance 308 of second electric capacity 310，The other end of the 3rd electric capacity 311、The outfan that node is ramp signal generative circuit 203 between the other end and the emitter stage of audion 312 of the 6th resistance 308.
In concrete implementation mode, the intervalometer 304 in ramp signal generative circuit 203 generally adopts NE555 intervalometer to generate ramp voltage, by adjusting circuit parameter, is set greater than the low frequency signal of 1 second, in order to controller collection the oblique wave cycle.NE555 uses 12V power voltage supply, then the crest voltage of the ramp signal that can generate is 7V.The capacitance of resistance and the second electric capacity 310 by adjusting the 3rd resistance the 305, the 4th resistance 306, thus it is possible to vary the frequency of the ramp signal of generation.The radiator fan still used for unit electrical control cubicles, it is assumed that the cycle of the ramp signal of setting is 1.5 seconds, belongs to low frequency signal, therefore unit master controller only needs to use common DI passage, it becomes possible to complete the collection of switch amount signal.
With continued reference to Fig. 5, comparison circuit 204 includes comparator 313 and the 7th resistance 314, and the inverting input of comparator 313 is connected with the emitter stage of audion 312；The in-phase input end of comparator 313 connects the outfan of amplifying circuit 202, and is connected the outfan of comparison circuit 204 by the 7th resistance 314.
Specifically, the inverting input of comparator 313 is connected with the outfan of ramp signal generative circuit 203, node between one end and the positive power source terminal of comparator 313 of the 7th resistance 314, it is connected with the node between the in-phase input end of the outfan of voltage signal testing circuit 110 and comparator 313, and with the second DC source (as illustrated in the drawing+24V)) be connected, the outfan that node is comparison circuit 204 between the other end and the outfan of comparator 313 of the 7th resistance 314.
In order to improve the driving force of comparison circuit output, alternatively, failure detector also includes: be connected on the 8th resistance 315 between the outfan of controller 130 and comparison circuit 204.
In concrete implementation mode, in comparison circuit 204, the chip of model LM339 generally selected by comparator 313, its advantage is voltage offsets little (being usually 2mV), common mode range is very big, the internal resistance comparing signal source is limited very wide, the voltage range allowing input reaches as high as 36V, it is possible to directly use the power supply of 24V.In comparison circuit 204, when the voltage of the in-phase input end of comparator 313 is higher than the voltage of inverting input, the output of comparator 313 is high level.Here, the 7th resistance 314 is equivalent to a pull-up resistor, 24V, 24V voltage is drawn high in the output of comparator 313 and exports controller 130 through the 7th resistance 314 and the 8th resistance 315；When the voltage of in-phase input end of comparator 313 is lower than the voltage of inverting input, the output of comparator 313 is low level, 24V voltage electric current on the 7th resistance 314, flows into the outfan of comparator 313, and namely electric current fills formation loop in comparator 313.Now the outfan no current of comparison circuit 204 flows through, and the voltage being input to controller 130 is 0V.Thus produce the pwm signal of certain dutycycle.Subsequent controllers 130 gathers this pwm signal, judges the process of radiator fan fault according to the dutycycle size of pwm signal, and previous embodiment describes in detail, does not do tired stating at this.
The failure detector of the radiator fan that this utility model embodiment provides, has the following technical effect that
One is that circuit structure is simple, cost is low, highly versatile, it is adaptable to various types of radiator fans.Even if detecting different types of radiator fan, it is not necessary to change or hardware in newly-increased circuit, without the parameter of amendment software and hardware；
Two to be because basis for estimation be dutycycle, it is not necessary to obtain the magnitude of voltage as amplified circuit amplifies, the magnitude of voltage such as ramp voltage signal peak that ramp signal generative circuit generates, etc. concrete numerical value, so that it may detect the various faults of radiator fan accurately and rapidly；
Three is owing to have employed ramp voltage computed duty cycle, and the excursion of ramp voltage is very wide, and therefore, accidental electric current, the drift of voltage will not cause error detection.
Embodiment four
Heat abstractor include radiator fan and arbitrary in previous embodiment one, embodiment two and embodiment three as described in the failure detector of radiator fan, radiator fan electrically connects with the failure detector of radiator fan.
The heat abstractor that this utility model embodiment provides, the detectable voltage signals exported according to voltage signal testing circuit by pwm signal generative circuit generates pwm signal, determine the fault type of radiator fan further according to the dutycycle of the pwm signal generated by controller, it is achieved thereby that while radiator fan carries out radiating treatment, can fault detect to radiator fan accurately and rapidly, and circuit structure is simple, cost is low, it is adaptable to the fault detect of various types of radiator fans.
The above; it is only detailed description of the invention of the present utility model; but protection domain of the present utility model is not limited thereto; any those familiar with the art is in the technical scope that this utility model discloses; change can be readily occurred in or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with described scope of the claims.
Claims (8)
1. the failure detector of a radiator fan, it is characterised in that including: voltage signal testing circuit, pwm signal generative circuit and the controller being sequentially connected with, wherein, the input of described voltage signal testing circuit accesses in the current supply circuit of radiator fan；
Described pwm signal generative circuit is for generating pwm signal according to the detectable voltage signals of described voltage signal testing circuit output, and described controller for determining the fault type of described radiator fan according to the dutycycle of described pwm signal.
2. failure detector according to claim 1, it is characterized in that, described voltage signal testing circuit includes sampling resistor and the amplifying circuit of parallel connection, wherein, described sampling resistor accesses in the current supply circuit of described radiator fan, and the outfan of described amplifying circuit connects described pwm signal generative circuit.
3. failure detector according to claim 2, it is characterized in that, described pwm signal generative circuit includes ramp signal generative circuit and comparison circuit, wherein, the outfan of described ramp signal generative circuit is connected with the input of described comparison circuit respectively with the outfan of described amplifying circuit, and the outfan of described comparison circuit is connected with described controller.
4. failure detector according to claim 3, it is characterised in that described amplifying circuit includes: amplifier, the first resistance and the second resistance；The in-phase input end of described amplifier is connected with described radiator fan and by described sampling resistor ground connection；The inverting input of described amplifier connects the outfan of described amplifier by described first resistance, and by described second resistance eutral grounding；The outfan of described amplifier is the outfan of described amplifying circuit.
5. the failure detector according to claim 3 or 4, it is characterised in that described ramp signal generative circuit includes: intervalometer, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity and audion；The power end of described intervalometer described 3rd resistance, the 4th resistance and the second capacity earth by being sequentially connected with；The trigger input of described intervalometer, threshold value end and discharge end pass through described second capacity earth；The control end of described intervalometer passes through described first capacity earth；One end of described 5th resistance connects the node between described 4th resistance and described second electric capacity, and the other end is connected with the base stage of described audion；The colelctor electrode of described audion and the first DC source are connected；The emitter stage of described audion passes through described 6th resistance eutral grounding, and connects the node between described 3rd resistance and the 4th resistance by described 3rd electric capacity.
6. failure detector according to claim 5, it is characterised in that described comparison circuit includes comparator and the 7th resistance, and the inverting input of described comparator is connected with the emitter stage of described audion；The in-phase input end of described comparator connects the outfan of described amplifying circuit, and is connected the outfan of described comparison circuit by described 7th resistance.
7. failure detector according to claim 6, it is characterised in that described failure detector also includes: be connected on the 8th resistance between the outfan of described controller and described comparison circuit.
8. a heat abstractor, it is characterised in that described heat abstractor includes: the failure detector of radiator fan and the radiator fan as according to any one of claim 1～7, described radiator fan electrically connects with the failure detector of described radiator fan.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589327A (en) * | 2017-09-19 | 2018-01-16 | 天津康途科技有限公司 | A kind of detection means of fan of frequency converter failure |
| CN107725451A (en) * | 2016-08-11 | 2018-02-23 | 佛山市顺德区美的电热电器制造有限公司 | Blower fan method for detecting abnormality, device and the electromagnetic heater of electromagnetic heater |
| CN110501604A (en) * | 2019-08-22 | 2019-11-26 | 江苏春博电子科技有限公司 | A kind of detection device and its detection method of brushed DC blower open-circuit fault |
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2016
- 2016-03-15 CN CN201620198352.7U patent/CN205383099U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725451A (en) * | 2016-08-11 | 2018-02-23 | 佛山市顺德区美的电热电器制造有限公司 | Blower fan method for detecting abnormality, device and the electromagnetic heater of electromagnetic heater |
| CN107725451B (en) * | 2016-08-11 | 2020-07-28 | 佛山市顺德区美的电热电器制造有限公司 | Fan abnormity detection method and device of electromagnetic heating device and electromagnetic heating device |
| CN107589327A (en) * | 2017-09-19 | 2018-01-16 | 天津康途科技有限公司 | A kind of detection means of fan of frequency converter failure |
| CN110501604A (en) * | 2019-08-22 | 2019-11-26 | 江苏春博电子科技有限公司 | A kind of detection device and its detection method of brushed DC blower open-circuit fault |
| CN110501604B (en) * | 2019-08-22 | 2021-10-12 | 江苏春博电子科技有限公司 | Detection device and detection method for open-circuit fault of brushed direct-current fan |
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