CN1147771C - Early warning circuit for fan fault - Google Patents
Early warning circuit for fan fault Download PDFInfo
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- CN1147771C CN1147771C CNB98122444XA CN98122444A CN1147771C CN 1147771 C CN1147771 C CN 1147771C CN B98122444X A CNB98122444X A CN B98122444XA CN 98122444 A CN98122444 A CN 98122444A CN 1147771 C CN1147771 C CN 1147771C
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- microprocessor
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- 238000001914 filtration Methods 0.000 claims abstract description 30
- 230000009183 running Effects 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 241000883990 Flabellum Species 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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Abstract
The present invention relates to a fan failure prewarning circuit which comprises a power supply circuit, a fan rotating control circuit, a wave filtering comparison circuit, a microprocessor and a prewarning display circuit, wherein the fan rotating control circuit is used for outputting the current change produced by the fan rotation in the form of direct-current voltage; the wave filtering comparison circuit is used for filtering waves to the direct-current voltage, and a high-low voltage changing signal generated through the comparison of a comparator with reference voltage is input; the microprocessor is used for calculating the input signal amount of the high-low voltage changing signal; the prewarning display circuit is used for receiving the prewarning control signal output by the microprocessor and sends out a warning signal. When a fan rotates at abnormal rotary speed and the rotary speed is low, the fan is closed and stops rotating, simultaneously, the fan failure prewarning circuit sends out a warning signal so as to inform a user of changing the fan.
Description
Technical field
The present invention relates to a kind of early warning circuit, relate in particular to a kind of early warning circuit for fan fault.
Background technology
No matter be desktop computer, portable computer, body such as servomechanism or UPS is after start running a period of time, the whole machine body internal temperature tends to suitable height, be easy to crash when making the internal body temperature overheating so that the situation that data run off, even electronic component burnt, therefore, how can just become a considerable problem for the internal body heat radiation fast, the heat radiation of aforementioned these bodies at present, mainly be to cooperate radiator fan to use with heating radiator, and the same industry also is no lack of at heating radiator or radiator fan and improved, to reach better heat radiating effect.
As mentioned above, with the radiator fan is example, general uses radiator fan at aforementioned these bodies as price on comparatively cheaply, " TW two wire fan " that specification is comparatively complete and comparatively general, two incoming lines of TW two wire fan connect respectively+(just) ,-(bearing) power supply, in other words, the TW two wire fan turned round when start made the power supply input, power supply can't be imported the TW two wire fan it is shut down during shutdown, in case fan has been broken, and the user does not discover immediately, and then above-mentioned deadlock so that data run off or the situation that burns out other electronic component just is easy to take place; It should be noted that, radiator fan is before breaking down so that shutting down fully, the rotation of flabellum is not moment to enter out-of-work state immediately by normal speed, but lowering slowly, therefore, can learn that by the change of rotation speed of the fan fan is that get well or badly fast, so the dealer designs " three-wire type fan ".The three-wire type fan connects respectively except remaining with the TW two wire fan+two incoming lines of (just)-(bearing) power supply, more include a waveform (CLK, CLOCK) output line, bar waveform (CLK) output line can be learnt the rotating speed of fan thus, and then judges that fan is good or badly fast, when rotation speed of the fan is healed when fast, CLK output is higher, frequency is also higher, otherwise, when rotation speed of the fan is healed when slow, CLK output is lower, frequency is also lower, by using " three-wire type fan ", makes CLK output step-down, and rotation speed of the fan is slack-off to a certain degree the time, can know that fan is badly fast, and the instantaneously changing fan, avoid the shortcoming of " TW two wire fan ".Because the specification of " three-wire type fan " is more incomplete, pattern is few, and the market path is incomplete so that price is higher, so the fan that is used at present in the bodies such as desktop computer, portable computer, servomechanism or UPS is not used " three-wire type fan " fully instead, most computer/system dealer still is to use " TW two wire fan " under considering based on cost.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of early warning circuit for fan fault, it can detect the situation of fan (TW two wire fan) at any time, fan is not rotated and rotating speed when extremely slow (when just the fast bosom of fan is fallen) with rated speed, close fan it is stopped operating, and send alert news simultaneously and notify the user to change.
Another object of the present invention is to provide a kind of early warning circuit for fan fault, it makes fan can change the rotating speed of fan with the temperature variation of environment, and then reaches the function that prolongs fan serviceable life and power saving.
The object of the present invention is achieved like this, a kind of early warning circuit for fan fault, it is characterized in that, it comprises: a fan rotation control circuit, and it comprises a transistor and a transfer resistance in order to the control fan running, transistorized emitter and transfer resistance join, when transistor during in off working state fan do not turn round, when transistor fan running in working order the time, the electric current variation meeting that fan is produced when rotating produces voltage drop on this transfer resistance, export with DC voltage; One filtering comparator circuit, it comprises a direct current filtering circuit and a comparer, the output terminal of DC filtering circuit and the positive input of comparer join, the DC voltage that described fan rotation control circuit is exported is at first via this DC filtering circuit filtering, then imports this comparer and a reference voltage comparison and produces a height voltage change signal; One microprocessor, after receiving the height voltage change signal that described filtering comparator circuit produced, calculate its input signal amount, when the calculated value that is obtained is lower than its setting value, this microprocessor is exported a fan shutdown signal and is given the transistor of this fan rotation control circuit and then fan is stopped operating, and exports an early warning control signal; One early warning display circuit, in order to receive the early warning control signal that described microprocessor is exported, then send alert news, this early warning display circuit comprises a cresset display unit and a hummer, cresset display unit and hummer join with microprocessor respectively, and controlled by microprocessor; And a power circuit, in order to supply described fan rotation control circuit, filtering comparator circuit, microprocessor and the required power supply of early warning display circuit running.
Owing to adopted above-mentioned technical solution, in order to detect the situation of fan at any time, can not rotate and rotating speed when extremely slow (when also fan breaks down soon) at fan with rated speed, closing fan stops operating it, and send alert news simultaneously and notify the user to change, in addition, fan can change the rotating speed of fan with the temperature variation of environment, reach the function that prolongs fan serviceable life and power saving, thereby significantly reduce cost.
Description of drawings
Below in conjunction with drawings and Examples early warning circuit for fan fault of the present invention is elaborated.
Fig. 1 is the circuit block diagram of preferred embodiment of the present invention;
Fig. 2 is the detailed circuit diagram of of the present invention preferred embodiment of microprocessor when being connected with first fan;
Fig. 3 is that the microprocessor of Fig. 2 is connected with second fan;
Fig. 4 is that the microprocessor of Fig. 2 is connected with three fan;
Fig. 5 is that the microprocessor of Fig. 2 is connected with the 4th fan.
Embodiment
As Fig. 1, shown in 2, early warning circuit for fan fault of the present invention comprises a fan rotation control circuit 1, a filtering comparator circuit 2, a microprocessor 3, an early warning display circuit 4, a current-limiting circuit 5 and a power circuit 6, please cooperate consult shown in Figure 3, early warning circuit for fan fault of the present invention can supply four desk fans 7 (first fan 71 simultaneously, second fan 72, three fan 73, the 4th fan 74) connects, in Fig. 2, only show the state that connects a desk fan (first fan 71), other fans (second fan 72, three fan 73, the 4th fan 74) then is shown in Fig. 3 with being connected of microprocessor 3,4, in 5.
This fan rotation control circuit 1 comprises a transistor Q1 and a transfer resistance R5, at this is to be numbered the preferable enforcement as transistor Q1 of 882 transistor with one, by this transistor Q1 control fan 7 (first fan 71) running, when transistor Q1 during in off working state fan 7 do not turn round, when transistor Q1 fan 7 runnings in working order the time, when fan 7 rotates because of the existence of carbon brush is arranged, the feasible variation that produces Weak current, this electric current variation meeting produces voltage drop on this transfer resistance R5, export with DC voltage.
This filtering comparator circuit 2 comprises a DC filtering circuit 20 and a comparer 21, this DC filtering circuit 20 is made up of a resistor R 6, a capacitor C1 and a resistor R 8, and this comparer 21 then is numbered the comparer of LM339 as preferable enforcement with one at this; The DC voltage that aforementioned this fan rotation control circuit 1 is exported is then imported this comparer 21 and a reference voltage (dividing potential drop that is produced is a reference voltage) and is relatively produced a height voltage change signal at first via these DC filtering circuit 20 filtering between resistor R 7 and R9; When via these DC filtering circuit 20 filtered DC voltage during greater than this reference voltage, comparer 21 output HIGH voltage signals (HIGH), when via these DC filtering circuit 20 filtered DC voltage during less than this reference voltage, comparer 21 output LOW voltage signals (LOW).
This microprocessor 3 is to be numbered the microprocessor of AT89C1051 as preferable enforcement with one at this, this microprocessor 3 is after receiving the height voltage change signal that this filtering comparator circuit 2 produced, calculate its input signal amount, when the calculated value that is obtained is lower than setting value, this microprocessor 3 can be exported the transistor Q1 that a fan shutdown signal is given this fan rotation circuit 1, fan 7 is stopped operating, and export an early warning control signal.This early warning display circuit 4 is in order to receive the early warning control signal that this microprocessor 3 is exported, send alert news then, this early warning display circuit 4 comprises a cresset display unit 40, a hummer 41 and a push switch 42, wherein this cresset display unit 40 comprises four LEDs 1, LED2, LED3 and LED4, each light emitting diode does not work usually, in case receive corresponding fan first fan 71 that this microprocessor 3 is exported, second fan 72, the early warning control signal of three fan 73 or the 4th fan 74, corresponding LED 1, LED2, LED3 or LED4 can be bright; Aforementioned this microprocessor 3 must be earlier via the concussion of an oscillating circuit 43, and the early warning control signal that hummer 41 like this just can be subjected to microprocessor 3 to be exported is moved and work (sound gives the alarm); Moreover, push switch 42 is at the state of not conducting that cuts off the power supply (OFF) when flat, when giving the alarm sound when hummer 41 actions, push switch 42 will be switched on (ON) and takeoff, when the user hears alarm sound and desires to go to when handling, if press push switch 42 just can be so that hummer 41 stops to give the alarm sound (stopping to move).
This current-limiting circuit 5 electrically connects with aforementioned this fan rotation control circuit 1, when being high voltage (high), the input voltage of this current-limiting circuit 5 makes not conducting of diode D1, this moment fan rotation control circuit 1 transistor Q1 in working order, and then make fan 7 runnings; Make diode D1 conducting when the input voltage of this current-limiting circuit 5 is low-voltage (LOW), this moment, transistor Q1 was in off working state, and then fan 7 is shut down.This current-limiting circuit 5 also comprises a hot end instrument 50, at this is with the preferable enforcement of a thermistor as hot end instrument 50, environment temperature by these thermistor sensing fan 7 places, change the rotating speed of fan 7, when environment temperature that this thermistor sensed higher, the resistance of thermistor is lower, fan 7 rotating speeds are faster, opposite, when environment temperature that this thermistor sensed is lower, the resistance of thermistor is higher, and fan 7 rotating speeds are slower, by the use of this hot end instrument 50, can reach the function that prolongs 7 serviceable lifes of fan and power saving.This power circuit 6, power supply are given aforementioned this fan rotation control circuit 1, this filtering comparator circuit 2, this microprocessor 3, this early warning display circuit 4 and 5 runnings of this current-limiting circuit.
By the early warning circuit for fan fault of the present invention that foregoing circuit constituted, can use with low price, handy " TW two wire fan " collocation, make " TW two wire fan " reach the advantage of " three-wire type fan ".Circuit operation brief description of the present invention is in following.
When being high voltage (high), the input voltage of this current-limiting circuit 5 makes not conducting of diode D1, the transistor Q1 of fan rotation control circuit 1 in working order at this moment, and fan 7 is turned round, when fan 7 rotates because of the existence of carbon brush is arranged, produce the variation of Weak current, this electric current variation meeting produces voltage drop on this transfer resistance R5, export with DC voltage, and, then import this comparer 21 and a reference voltage comparison and produce a height voltage change signal through DC filtering circuit 20 filtering of this filtering comparator circuit 2; Regularly calculate the electric current varied number that is produced when fan 7 rotates by microprocessor 3; to judge the situation of fan 7; the setting value that is lower than microprocessor 3 when calculated value (is that rotation speed of the fan is extremely slow; when breaking down soon) will close fan 7 via fan rotation control circuit 1 it is stopped operating; and simultaneously send alert news and make the user learn to change by early warning display circuit 4; protecting the system at these fan 7 places, exempt because of the fault of fan 7 so that system overheat, cause crashing so that data run off or burn out other electronic component equivalent risk.
In sum, early warning circuit for fan fault of the present invention can reach following advantage really:
1. detect the situation of fan at any time, fan do not rotate with rated speed and rotating speed when extremely slow (when just fan breaks down soon) just close fan it stopped operating, can send alert news simultaneously and make the user learn to change.
2. significantly reduce cost.
3. fan can change the rotating speed of fan with the temperature variation of environment, reaches the function that prolongs fan serviceable life and power saving.
Claims (3)
1. early warning circuit for fan fault is characterized in that it comprises:
One fan rotation control circuit, comprise a transistor and a transfer resistance in order to the control fan running, transistorized emitter and transfer resistance join, when transistor during in off working state fan do not turn round, when transistor fan running in working order the time, the electric current variation that fan is produced when rotating produces voltage drop on described transfer resistance, and exports with DC voltage;
One filtering comparator circuit, comprise a direct current filtering circuit and a comparer, the output terminal of DC filtering circuit and the positive input of comparer join, the DC voltage of described fan rotation control circuit output is at first via this DC filtering circuit filtering, then imports this comparer and a reference voltage comparison and produces a voltage change signal just;
One calculates the microprocessor of its input signal amount behind the height voltage change signal that receives described filtering comparator circuit generation, when the calculated value that is obtained is lower than its setting value, described microprocessor is exported the described transistor that a fan shutdown signal is given described fan rotation control circuit, and exports an early warning control signal;
One in order to receive early warning control signal that described microprocessor exports, then to send the early warning display circuit of alert news, comprises a cresset display unit and a hummer, and cresset display unit and hummer join with microprocessor respectively, and controlled by microprocessor; And
One in order to supply described fan rotation control circuit, filtering comparator circuit, microprocessor, to reach the power circuit that the early warning display circuit operates required power supply.
2. early warning circuit for fan fault as claimed in claim 1, it is characterized in that: also comprise a current-limiting circuit that electrically connects with described fan rotation control circuit, when the input voltage of described current-limiting circuit makes transistor in working order during for high voltage, when the input voltage of this current-limiting circuit does not work transistor during for low-voltage.
3. early warning circuit for fan fault as claimed in claim 2 is characterized in that: described current-limiting circuit also comprises a sensing fan place environment temperature and then changes the hot end instrument of rotation speed of the fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB98122444XA CN1147771C (en) | 1998-11-16 | 1998-11-16 | Early warning circuit for fan fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB98122444XA CN1147771C (en) | 1998-11-16 | 1998-11-16 | Early warning circuit for fan fault |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1254116A CN1254116A (en) | 2000-05-24 |
| CN1147771C true CN1147771C (en) | 2004-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB98122444XA Expired - Fee Related CN1147771C (en) | 1998-11-16 | 1998-11-16 | Early warning circuit for fan fault |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1147771C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329377B (en) * | 2007-06-21 | 2011-04-06 | 台达电子工业股份有限公司 | Electronic system and warning apparatus thereof |
| CN102865241A (en) * | 2012-09-25 | 2013-01-09 | 北京机械设备研究所 | Fan operational monitoring method based on fan operation current detection |
| CN103412638A (en) * | 2013-08-16 | 2013-11-27 | 宁夏新航信息科技有限公司 | Method for automatically turning off display |
| CN103592919B (en) * | 2013-11-13 | 2016-03-09 | 青岛海尔软件有限公司 | A kind of home appliance failure risk Prediction System and method |
| US9562933B2 (en) * | 2013-12-03 | 2017-02-07 | Ford Global Technologies, Llc | Diagnostic method for multiple speed relay-controlled electric fan |
| CN104728143B (en) * | 2013-12-23 | 2016-10-05 | 江苏春兰清洁能源研究院有限公司 | Fan detector |
| CN105868530B (en) * | 2016-03-21 | 2018-11-09 | 联想(北京)有限公司 | The method and apparatus of information processing |
| 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 |
| CN110488683A (en) * | 2019-08-01 | 2019-11-22 | 江苏斯菲尔电气股份有限公司 | A kind of active filter fan monitoring system |
| CN111420325A (en) * | 2020-04-29 | 2020-07-17 | 大连理工度达安全工程有限公司 | Dust explosion-proof integrated system |
| TWI762122B (en) * | 2020-12-29 | 2022-04-21 | 建準電機工業股份有限公司 | Fan automatic detection system and fan automatic detection method |
-
1998
- 1998-11-16 CN CNB98122444XA patent/CN1147771C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1254116A (en) | 2000-05-24 |
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Granted publication date: 20040428 Termination date: 20091216 |