CN103244447A - Fault detection circuit and method for accurately detecting running conditions of alternating current fan - Google Patents
Fault detection circuit and method for accurately detecting running conditions of alternating current fan Download PDFInfo
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- CN103244447A CN103244447A CN2013101889403A CN201310188940A CN103244447A CN 103244447 A CN103244447 A CN 103244447A CN 2013101889403 A CN2013101889403 A CN 2013101889403A CN 201310188940 A CN201310188940 A CN 201310188940A CN 103244447 A CN103244447 A CN 103244447A
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Abstract
The invention relates to a fault detection circuit and method for accurately detecting running conditions of an alternating current fan. The fault detection circuit comprises the alternating current fan. The alternating current fan is connected with a fan current detection processing circuit for detecting working current of the alternating current fan, the fan current detection processing circuit outputs detected working current to a control circuit, and the control circuit is connected with the alternating current fan through a fan driving circuit so as to drive the alternating current fan through the fan driving circuit. A first working current value of the alternating current fan in normal working is prestored in the control circuit, the control circuit compares the detected working current with the first working current value; and when the detected working current is unmatched with the first working current value, the control circuit judges running faults of the alternating current fan according to conditions of driving signals output to the fan driving circuit. The fault detection circuit is compact in structure, high in detection precision, low in detection cost, wide in applied range, and safe and reliable.
Description
Technical field
The present invention relates to a kind of fault-detecting circuit and method, especially a kind of fault-detecting circuit and method of accurate detection ac fan operation conditions belong to the technical field of ac fan faut detection.
Background technique
High-power electrical equipment is widely used in the industry-by-industry of society, higher owing to power level as powerful devices such as the energy, machinery, metallurgy, telecommunications, heating value is big, so heat dissipation problem is paid close attention to by everybody always, existing heat exchange means has: natural air heat loss through convection, forced air cooling, water-cooled etc.In the forced air cooling heat radiation, fan is one of most important parts, and its working condition directly influences the ride quality of equipment.Because fan is in the air channel, environment facies are to badly, and are in mechanical rotation status, thereby belong to easily worn part in electrical equipment, and rate of fault is very high, seems particularly important so fan failure detects.Existing fan failure detects two kinds of thinkings, and a kind of is that fan inside carries trouble signal output, is the fan peripheral auxiliary circuits to be monitored draw trouble signal in another.
Possess on the fan cost of trouble signal output much larger than the fan of the fault-free signal output of same specification, and then weakening complete machine competitive advantage, the shortcoming of this fault detection method can only detect the fault of fan itself in addition, shortage is communicated by letter (still needing peripheral auxiliary circuits that trouble signal is handled) with control unit, and can't and the driving signal of control unit between do logic and judge, if breaking down, the circuit between control unit and the fan (comprises blower fan insurance open circuit, circuit connects fault etc.) cause the fan stall, fan can't provide trouble signal and alarm.
By peripheral auxiliary circuits fan is carried out the method for malfunction monitoring, have employing in the fan loop, to seal in diode, when control unit sends the driving signal, fan running, the conduction voltage drop of diode drives the former limit of optical coupler, can pass through peripheral circuit after the conducting of optical coupler secondary, passes signal back control unit, when fan breaks down, current vanishes, diode does not have conduction voltage drop, and the optical coupler secondary obtains opposite signal, and then the judgement fan failure, its principle schematic such as Fig. 1.
The shortcoming of this testing circuit is to detect the open fault of fan, and when short circuit took place, diode also can conducting, and the optical coupler secondary obtains correct signal, thereby can't detect the fan short trouble; Need in the fan major loop, seal in diode and rectifier bridge in addition, increase power consumption greatly, calculate according to the loss of diode:
P
diode=N*V
f*I
f
Wherein, V
fBe the conduction voltage drop of diode, I
fBe fan electrical current, N is diode series connection quantity in the loop.When this circuit was used for the powerful fan faut detection, the loss meeting of diode and rectifier bridge was very big, and need to increase extra heat radiation and solve, and then the overall plan cost that increases.
Though this circuit can be realized the isolation of trouble signal and main circuit by optical coupler, the isolation Level that common optocoupler provides is lower, and the isolation of high insulation class is provided if desired, must select the expanded letter optocoupler for use, and its cost is several times of normal optical Coupler.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of fault-detecting circuit and method of accurate detection ac fan operation conditions is provided, its compact structure, the testing precision height, it is low to detect cost, and wide accommodation is safe and reliable.
According to technological scheme provided by the invention, the fault-detecting circuit of described accurate detection ac fan operation conditions comprises ac fan; Described ac fan is connected with blower fan current detecting processing circuit for detection of described ac fan operating current, described blower fan current detecting processing circuit transfers to control circuit with the operating current that detects, described control circuit is connected with ac fan by the blower fan drive circuit, to drive ac fan by the blower fan drive circuit; First working current value when being pre-stored with the ac fan proper functioning in the control circuit, control circuit compares operating current and first working current value that detects; When the operating current that detects and first working current value did not match, control circuit was according to the operation troubles of the driving RST judgement output AC fan of aweather drive circuit output.
The operation troubles of described control circuit output comprises open circuit, short circuit or the stall of ac fan.Described blower fan current detecting processing circuit comprises that current transformer, hall effect sensor, shunt or giant magneto-resistance sensor etc. are for detection of Detecting element isolation or non-isolation of electric current.
When described blower fan current detecting processing circuit adopts current transformer, one end on the former limit of current transformer is connected with ac fan, the other end on the former limit of current transformer is connected with the blower fan drive circuit, one end of the secondary of current transformer is connected with an end of an end of second resistance and the 3rd resistance, the equal ground connection of the other end of the other end of current transformer secondary and second resistance, the other end of the 3rd resistance is connected with the in-phase end of operational amplifier, the end of oppisite phase of operational amplifier is connected with the output terminal of operational amplifier, and the output terminal of operational amplifier is connected with control circuit.
Described blower fan drive circuit comprises controllable silicon, and described silicon controlled control end is connected with the output terminal of control circuit.
A kind of fault detection method of accurate detection ac fan operation conditions, described ac fan operation conditions fault detection method comprises the steps:
A, obtain the operating current of ac fan, and described operating current is transferred in the control circuit;
B, control circuit compare first working current value of described operating current and prestor;
C, when the described operating current that obtains and first working current value do not match, control circuit is judged the working state of ac fan according to the state of drive circuit output drive signal aweather; When ac fan is in fault state, control circuit output trouble signal.
Among the described step c, when the operating current that obtains and first working current value did not match, control circuit was aweather during the drive circuit output drive signal, and control circuit is determined and the trouble signal of output AC fan.
Among the described step a, utilize blower fan current detecting processing circuit to obtain the operating current of ac fan, described blower fan current detecting processing circuit comprises that current transformer, hall effect sensor, shunt or giant magneto-resistance sensor etc. are for detection of Detecting element isolation or non-isolation of electric current.
When described blower fan current detecting processing circuit adopts current transformer, one end on the former limit of current transformer is connected with ac fan, the other end on the former limit of current transformer is connected with the blower fan drive circuit, one end of the secondary of current transformer is connected with an end of an end of second resistance and the 3rd resistance, the equal ground connection of the other end of the other end of current transformer secondary and second resistance, the other end of the 3rd resistance is connected with the in-phase end of operational amplifier, the end of oppisite phase of operational amplifier is connected with the output terminal of operational amplifier, and the output terminal of operational amplifier is connected with control circuit.
In a kind of similar techniques scheme, a kind of fault detection method of accurate detection ac fan operation conditions, its described ac fan operation conditions fault detection method comprises the steps:
S1, obtain the operating current of ac fan, and described operating current is transferred in the control circuit;
S2, obtain the operating voltage at ac fan two ends, and described operating voltage is transferred in the control circuit;
S3, control circuit are judged the also working state of output AC fan according to the working current value that receives and operational voltage value.
Advantage of the present invention: obtain the operating current of ac fan by blower fan current detecting processing circuit, adopt operating current as the foundation of judging the ac fan running state, the testing precision height, it is low to detect cost, and the fault coverage that detects ac fan is wide; Control circuit can only judge whether ac fan exists operating current, judges whether ac fan is in fault state, and wide accommodation can detect at a plurality of ac fans simultaneously synchronously, and is simple and compact for structure, safe and reliable.
Description of drawings
The circuit theory diagrams that Fig. 1 detects for existing ac fan operation conditions.
The circuit block diagram that Fig. 2 detects for electric current mode of operation of fan of the present invention.
Fig. 3 is circuit theory diagrams of the present invention.
Fig. 4 judges the flow chart of ac fan operation conditions for control circuit of the present invention.
Description of reference numerals: 1-control circuit, 2-blower fan drive circuit, 3-ac fan, 4-blower fan current detecting processing circuit, 21-controllable silicon, 41-current transformer and 42-operational amplifier.
Embodiment
The invention will be further described below in conjunction with concrete drawings and Examples.
As shown in Figures 2 and 3: in order to the present invention includes ac fan 3 quickly and accurately to the operation conditions detection of ac fan 3; Described ac fan 3 is connected with blower fan current detecting processing circuit 4 for detection of described ac fan 3 operating currents, described blower fan current detecting processing circuit 4 transfers to control circuit 1 with the operating current that detects, described control circuit 1 is connected with ac fan 3 by blower fan drive circuit 2, to drive ac fan 3 by blower fan drive circuit 2; First working current value when being pre-stored with ac fan 3 proper functioning in the control circuit 1, control circuit 1 compares operating current and first working current value that detects; When the operating current that detects and first working current value did not match, control circuit 1 was according to the operation troubles of the driving RST judgement output AC fan 3 of aweather drive circuit 2 outputs.
Particularly, the operation troubles of ac fan 3 generations in service comprises open circuit, short circuit or stall, and the operation troubles of therefore described control circuit 1 output comprises open circuit, short circuit or the stall of ac fan 3.During ac fan 3 open circuits, the operating current that blower fan current detecting processing circuit 4 detects is zero, and when ac fan 3 was in short circuit or stall, the operating current that blower fan current detecting processing circuit 4 detects was higher than running current, namely can be higher than first working current value.Control circuit 1 comprises single-chip microcomputer, also can adopt little process chip commonly used (perhaps simple logic control circuit), and control circuit 1 stores first working current value in advance according to Environmental Conditions and the requirement of ac fan 3; When the operating current that obtains ac fan 3 by blower fan current detection circuit 4 and first working current value did not match, control circuit 1 was again according to having or not drive circuit 2 output drive signals aweather to judge the operation troubles of ac fan 3; When control circuit 1 aweather during drive circuit 2 output drive signals, 1 of control circuit judges that ac fan 1 is in the failure operation state.
Described blower fan current detecting processing circuit 4 comprises that current transformer 41, hall effect sensor, shunt or giant magneto-resistance sensor etc. are for detection of Detecting element isolation or non-isolation of electric current.
Say as Fig. 3: as described in blower fan current detecting processing circuit 4 when adopting current transformers 41, one end on current transformer 41 former limits is connected with ac fan 3, the other end on current transformer 41 former limits is connected with blower fan drive circuit 2, one end of the secondary of current transformer 41 is connected with an end of second resistance R 2 and an end of the 3rd resistance R 3, the equal ground connection of the other end of the other end of current transformer 41 secondary and second resistance R 2, the other end of the 3rd resistance R 3 is connected with the in-phase end of operational amplifier 42, the end of oppisite phase of operational amplifier 42 is connected with the output terminal of operational amplifier 42, and the output terminal of operational amplifier 42 is connected with control circuit 1.Described blower fan drive circuit 2 comprises controllable silicon 21, and the control end of described controllable silicon 21 is connected with the output terminal of control circuit 1.Blower fan drive circuit 2 can also adopt circuit realizations such as relay.In the embodiment of the invention, among Fig. 3 and being connected of not shown control circuit 1 and controllable silicon 21 and operational amplifier 42.
As Fig. 2, Fig. 3 and shown in Figure 4: as described in the fault detection method of detection ac fan operation conditions comprise the steps:
A, obtain the operating current of ac fan 3, and described operating current is transferred in the control circuit 1;
In the embodiment of the invention, the working current value by obtaining ac fan 3 is as the foundation that detects ac fan 1 running state; Obtain the operating current of ac fan 3 by blower fan current detecting processing circuit 4, blower fan current detecting processing circuit 4 comprises current transformer 41, and the current value that current transformer 41 detects is transferred in the control circuit 1 after handling by operational amplifier 42.The current value that blower fan current detecting processing circuit 4 detects is zero current value or is higher than first working current value.
B, control circuit 1 compare first working current value of described operating current and prestor;
After control electric current 1 receives working current value, can compare with first working current value of storage, to carry out follow-up judgement.
C, when the described operating current that obtains and first working current value do not match, control circuit 1 is judged the working state of ac fan 3 according to the state of drive circuit 2 output drive signals aweather; When ac fan 3 is in fault state, control circuit 1 output trouble signal.
In the embodiment of the invention, in order to realize the detection to ac fan 3 running statees quickly and easily, described ac fan operation conditions fault detection method can also comprise the steps:
S1, obtain the operating current of ac fan 3, and described operating current is transferred in the control circuit 1;
The described method of obtaining ac fan 3 operating currents can adopt corresponding current detecting processing circuit 4 to realize as above-mentioned method;
S2, obtain the operating voltage at ac fan 3 two ends, and described operating voltage is transferred in the control circuit 1;
The described method of obtaining ac fan 3 two ends operating voltages can adopt voltage sensor senses to realize.
S3, control circuit 1 are judged the also working state of output AC fan 3 according to the working current value that receives and operational voltage value.
When control circuit 1 when receiving operating voltage and operating current, control circuit 1 can fast and effeciently be judged the running state of ac fan 3 according to the relation of operating voltage and operating current.Non-vanishing as receive the operating voltage of ac fan 3 when control circuit 1, and the operating current of ac fan 3 can determine that ac fan 3 is in open-circuit condition when being zero.
As shown in the above description, the operating current of blower fan current detecting processing circuit 4 detections may or be higher than first working current value for zero current.When the current value of blower fan current detecting processing circuit 4 detections is zero, control circuit 1 judges whether oriented blower fan drive circuit 2 output drive signals, when drive circuit 2 output drive signals aweather, ac fan 3 should be able to be in running order, the operating current that detects when blower fan current detecting processing circuit 4 is zero and aweather during drive circuit 2 output drive signals, control circuit 1 can be judged and output AC fan 3 is in open-circuit condition.Non-vanishing when the operating current that blower fan current detecting processing circuit 4 detects, when control circuit 1 not aweather during drive circuit 2 output drive signals, control circuit 1 judges that ac fan 3 is in fault state; When the operating current that blower fan current detection circuit 4 detects non-vanishing, control circuit 1 is drive circuit 2 output drive signals aweather, and the working current value that 4 detections of blower fan current detecting processing circuit are obtained and the size of first working current value be not at once, and control circuit 1 judges and output AC fan 3 is in the failure operation state; Be that control circuit 1 can the output trouble signal when ac fan 3 is in the failure operation state.Aweather the driving signal of drive circuit 2 outputs can conveniently obtain corresponding signal by control circuit 1 output.
The present invention obtains the operating current of ac fan 3 by blower fan current detecting processing circuit 4, adopts operating current as the foundation of judging ac fan 3 running statees, the testing precision height, and it is low to detect cost, and the fault coverage that detects ac fan 3 is wide; Control circuit 1 can only judge whether ac fan 3 exists operating current, judges whether ac fan 3 is in fault state, and wide accommodation can detect at a plurality of ac fans 3 simultaneously synchronously, and is simple and compact for structure, safe and reliable.
Claims (10)
1. a fault-detecting circuit that accurately detects the ac fan operation conditions comprises ac fan (3); It is characterized in that: described ac fan (3) is connected with blower fan current detecting processing circuit (4) for detection of described ac fan (3) operating current, described blower fan current detecting processing circuit (4) transfers to control circuit (1) with the operating current that detects, described control circuit (1) is connected with ac fan (3) by blower fan drive circuit (2), to drive ac fan (3) by blower fan drive circuit (2); First working current value when being pre-stored with ac fan (3) proper functioning in the control circuit (1), control circuit (1) compares operating current and first working current value that detects; When the operating current that detects and first working current value did not match, control circuit (1) was according to the operation troubles of the driving RST judgement output AC fan (3) of drive circuit (2) output aweather.
2. the fault-detecting circuit of accurate detection ac fan operation conditions according to claim 1 is characterized in that: the operation troubles of described control circuit (1) output comprises open circuit, short circuit or the stall of ac fan (3).
3. the fault-detecting circuit of accurate detection ac fan operation conditions according to claim 1, it is characterized in that: described blower fan current detecting processing circuit (4) comprises current transformer (41), hall effect sensor, shunt or giant magneto-resistance sensor.
4. the fault-detecting circuit of accurate detection ac fan operation conditions according to claim 3, it is characterized in that: when described blower fan current detecting processing circuit (4) adopts current transformer (41), one end on the former limit of current transformer (41) is connected with ac fan (3), the other end on the former limit of current transformer (41) is connected with blower fan drive circuit (2), one end of the secondary of current transformer (41) is connected with an end of second resistance (R2) and an end of the 3rd resistance (R3), the other end of current transformer (41) secondary and the equal ground connection of the other end of second resistance (R2), the other end of the 3rd resistance (R3) is connected with the in-phase end of operational amplifier (42), the end of oppisite phase of operational amplifier (42) is connected with the output terminal of operational amplifier (42), and the output terminal of operational amplifier (42) is connected with control circuit (1).
5. the fault-detecting circuit of accurate detection ac fan operation conditions according to claim 4, it is characterized in that: described blower fan drive circuit (2) comprises controllable silicon (21), and the control end of described controllable silicon (21) is connected with the output terminal of control circuit (1).
6. a fault detection method that accurately detects the ac fan operation conditions is characterized in that described ac fan operation conditions fault detection method comprises the steps:
(a), obtain the operating current of ac fan (3), and described operating current is transferred in the control circuit (1);
(b), control circuit (1) compares first working current value of described operating current and prestor;
(c), when the described operating current that obtains and first working current value do not match, control circuit (1) is judged the working state of ac fan (3) according to the state of drive circuit (2) output drive signal aweather; When ac fan (3) when being in fault state, control circuit (1) output trouble signal.
7. according to the fault detection method of the described accurate detection ac fan operation conditions of claim 6, it is characterized in that, in the described step (c), when the operating current that obtains and first working current value do not match, control circuit (1) is aweather during drive circuit (2) output drive signal, and control circuit (1) is determined and the trouble signal of output AC fan (1).
8. according to the fault detection method of the described accurate detection ac fan operation conditions of claim 6, it is characterized in that, in the described step (a), utilize blower fan current detecting processing circuit (4) to obtain the operating current of ac fan (3), described blower fan current detecting processing circuit (4) comprises current transformer (41), hall effect sensor or shunt or giant magneto-resistance sensor.
9. the fault detection method of described accurate detection ac fan operation conditions according to Claim 8, it is characterized in that, when described blower fan current detecting processing circuit (4) adopts current transformer (41), one end on the former limit of current transformer (41) is connected with ac fan (3), the other end on the former limit of current transformer (41) is connected with blower fan drive circuit (2), one end of the secondary of current transformer (41) is connected with an end of second resistance (R2) and an end of the 3rd resistance (R3), the other end of current transformer (41) secondary and the equal ground connection of the other end of second resistance (R2), the other end of the 3rd resistance (R3) is connected with the in-phase end of operational amplifier (42), the end of oppisite phase of operational amplifier (42) is connected with the output terminal of operational amplifier (42), and the output terminal of operational amplifier (42) is connected with control circuit (1).
10. a fault detection method that accurately detects the ac fan operation conditions is characterized in that described ac fan operation conditions fault detection method comprises the steps:
(S1), obtain the operating current of ac fan (3), and described operating current is transferred in the control circuit (1);
(S2), obtain the operating voltage at ac fan (3) two ends, and described operating voltage is transferred in the control circuit (1);
(S3), control circuit (1) is judged the also working state of output AC fan (3) according to the working current value that receives and operational voltage value.
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| CN201310188940.3A CN103244447B (en) | 2013-05-20 | 2013-05-20 | Accurately detect failure detector circuit and the method for ac fan operation conditions |
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| CN201310188940.3A CN103244447B (en) | 2013-05-20 | 2013-05-20 | Accurately detect failure detector circuit and the method for ac fan operation conditions |
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| CN104570804A (en) * | 2013-10-12 | 2015-04-29 | 樱花卫厨（中国）股份有限公司 | Applying circuit for detecting current of fan in real time |
| WO2015158231A1 (en) * | 2014-04-14 | 2015-10-22 | 江苏多维科技有限公司 | Direct-current fan control chip |
| CN107477017A (en) * | 2017-08-31 | 2017-12-15 | 广东美芝制冷设备有限公司 | Fans drive protection circuit, fan and vehicle |
| CN108825545A (en) * | 2018-06-06 | 2018-11-16 | 珠海格力电器股份有限公司 | Fan detection method, device and system and air conditioning equipment |
| CN109931287A (en) * | 2019-04-10 | 2019-06-25 | 深圳市恩玖科技有限公司 | A kind of fault detection circuit and its fault detection method of ac fan |
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| CN104570804A (en) * | 2013-10-12 | 2015-04-29 | 樱花卫厨（中国）股份有限公司 | Applying circuit for detecting current of fan in real time |
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| CN109931287B (en) * | 2019-04-10 | 2020-06-12 | 深圳市恩玖科技有限公司 | Fault detection circuit of alternating current fan and fault detection method thereof |
| CN109931287A (en) * | 2019-04-10 | 2019-06-25 | 深圳市恩玖科技有限公司 | A kind of fault detection circuit and its fault detection method of ac fan |
| 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 |
| CN110501604A (en) * | 2019-08-22 | 2019-11-26 | 江苏春博电子科技有限公司 | A detection device and detection method for an open circuit fault of a brushed DC fan |
| CN114060297A (en) * | 2020-08-03 | 2022-02-18 | 广东美的环境电器制造有限公司 | Control method, circuit and device of electric fan and storage medium |
| CN114060297B (en) * | 2020-08-03 | 2024-01-09 | 广东美的环境电器制造有限公司 | Control method, circuit, device and storage medium of electric fan |
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