CN102996470A - AC (alternating current) fan fault detection circuit - Google Patents
AC (alternating current) fan fault detection circuit Download PDFInfo
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Abstract
The invention discloses an AC (alternating current) fan fault detection circuit, comprising a voltage detection unit, a differential amplification unit, a peak detection unit and a voltage comparison unit which are connected sequentially, wherein the voltage detection unit is used for detecting the voltage between two ends of a starting capacitor and an auxiliary winding; the differential amplification unit is used for carrying out differential amplification on the detection voltage obtained by the voltage detection unit; the peak detection unit is used for obtaining the peak value of the differential amplification voltage output by the differential amplification unit and outputting the peak value of the differential amplification voltage; and the voltage comparison unit is used for comparing the peak value of the differential amplification voltage with a reference voltage and outputting different levels under the conditions that the peak value of the differential amplification voltage is larger than the reference voltage and the peak value of the differential amplification voltage is smaller than the reference voltage, wherein the reference voltage is between the peak value of the differential amplification voltage when an AC fan works normally and the peak value of the differential amplification voltage when the AC fan stalls. According to the invention, whether the AC fan stalls or not can be precisely determined through detecting the voltage of the starting capacitor or auxiliary winding of the AC fan.
Description
Technical field
The present invention relates to single phase alternating current fan control field, more particularly, relate to a kind of alternating-current fan fault detection circuit.
Background technique
Because load motor has power supply characteristics simple, easy to use and is widely used, for example being applied to household electrical appliances, machinery, manufacturing equipment and other has on the product that ventilation and heat requires.In the said goods, because heat dispersion will directly affect product performance and product working life, so the stall faut detection of the load motor in these products also becomes extremely important.
At present, the fault detection method that above-mentioned ac fan is relatively more commonly used has two kinds: the first is fixed a Hall transducer at the motor stator of ac fan, as long as fan rotates, will produce alternating magnetic field, then Hall transducer is exported the alternating voltage that is directly proportional with rotation speed of the fan, can judge by the frequency that detects this alternating voltage whether fan has the stall fault; It two is to carry out current sample at precision resistance of the main circuit power supply of fan series connection, and because of relatively normally operation, the electric current of fan is larger in the stall situation, therefore can judge also by the voltage change of detection sampling resistor whether the stall fault is arranged.
Yet above-mentioned employing Hall transducer detects in the scheme of ac fan fault, needs to use Hall transducer.Hall transducer not only price is higher, and it must be fixed on fan electromotor inside, thereby increases the manufacturing process difficulty of fan.And Hall transducer can not be installed in some fan inside, and can not use this scheme this moment.
Adopt in the scheme of resistance to current sample, main circuit current flows through sampling resistor samples and certainly leads to larger power loss, and frequency and the voltage range of ac fan work are wider usually, and fan when being subjected to the variable effect of frequency and voltage main circuit current change also greatly, the main circuit current that probably works under a certain frequency and the voltage so just is difficult to confirm that ac fan is in normal working or stall state very near the main circuit current during stall under another frequency of okperation and the voltage.
Summary of the invention
The technical problem to be solved in the present invention is,, complex structure expensive for Hall transducer in the above-mentioned ac fan faut detection and the difficult problem of accurately judging of sampling resistor electric current provide a kind of alternating-current fan fault detection circuit.
The technological scheme that the present invention solves the problems of the technologies described above is, a kind of alternating-current fan fault detection circuit is provided, comprise the voltage detection unit, differential amplification unit, peak detection unit and the voltage comparison unit that connect successively, wherein: described voltage detection unit, for detection of start-up capacitance or auxiliary winding both end voltage; Described differential amplification unit is used for the detection voltage that described voltage detection unit obtains is carried out differential amplification; Described peak detection unit, be used for obtaining the output of described differential amplification unit differential amplification voltage peak value and export described differential amplification voltage peak; Described voltage comparison unit, be used for the peak value of differential amplification voltage and reference voltage relatively and at the differential amplification voltage peak greater than exporting varying level with less than reference voltage the time, between the differential amplification voltage peak and the differential amplification voltage peak during stall of described reference voltage when ac fan works.
In alternating-current fan fault detection circuit of the present invention, described voltage detection unit comprises divider resistance R1, the R2 that is serially connected with described start-up capacitance or auxiliary winding two ends.
In alternating-current fan fault detection circuit of the present invention, described differential amplification unit comprises resistance R 3, R4, R5, R6 and operational amplifier U1, and two ends, the other end that the end of wherein said resistance R 3, R4 is connected to respectively one of them divider resistance is connected respectively to first input end and the second input end of operational amplifier U1; First input end, the other end that one end of described resistance R 5 is connected to operational amplifier U1 is connected to the output terminal of operational amplifier U1; One end of described resistance R 6 is connected to the second input end, the other end ground connection of operational amplifier U1.
In alternating-current fan fault detection circuit of the present invention, the resistance of described resistance R 3, R4 equates, and the resistance of resistance R 5, R6 equates.
In alternating-current fan fault detection circuit of the present invention, described peak detection unit comprises diode D1, capacitor C 2 and resistance R 10, one end ground connection of wherein said capacitor C 2, the other end are connected to the output terminal of differential amplification unit via the diode D1 of reversal connection, and described resistance R 10 is connected to the two ends of described capacitor C 2.
In alternating-current fan fault detection circuit of the present invention, described voltage comparison unit comprises comparator U3, and the first input end of this comparator U3 connects the output terminal of reference voltage, the second input end connection peak detection unit.
In alternating-current fan fault detection circuit of the present invention, described voltage comparison unit comprises resistance R 8, R9, described resistance R 8, R9 are serially connected with between two input voltage VCC, the VEE, and the mid point of these two resistance R 8, R9 is connected to the first input end of comparator.
In alternating-current fan fault detection circuit of the present invention, described voltage comparison unit is exported high level, output low level when the ac fan stall when ac fan works
Alternating-current fan fault detection circuit of the present invention by detecting ac fan start-up capacitance or auxiliary winding voltage, can accurately be judged whether stall of ac fan.The present invention adopts the most basic components and parts, and is not only with low cost but also power loss is very low.
Description of drawings
Fig. 1 is the schematic representation of single phase alternating current fan drive circuit.
Main winding voltage, start-up capacitance voltage, auxiliary winding voltage concerned schematic representation when Fig. 2 was the ac fan normal operation.
Main winding voltage, start-up capacitance voltage, auxiliary winding voltage concerned schematic representation when Fig. 3 was the ac fan stall.
Fig. 4 is alternating-current fan fault detection circuit embodiment's of the present invention schematic representation.
Fig. 5 is the circuit diagram of alternating-current fan fault detection circuit specific implementation among Fig. 4.
Fig. 6 is alternating-current fan fault detection circuit of the present invention each several part voltage oscillogram when ac fan works.
Fig. 7 is alternating-current fan fault detection circuit of the present invention each several part voltage oscillogram when the ac fan stall.
Embodiment
In order to make purpose of the present invention, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, be the schematic representation of ac fan drive circuit.In this drive circuit, suppose that the supply voltage (also being main winding voltage) of motor power supply is Vs, start-up capacitance voltage is Vc, and auxiliary winding voltage is Vm, and then three voltage vectors should satisfy: Vs=Vc+Vm or Vc=Vs-Vm.
Since the phase shift effect of electric capacity, 90 ° in the auxiliary leading approximately main winding voltage of winding voltage Vm Vs phase place.When ac fan works, have counterelectromotive force on the auxiliary winding, this moment, auxiliary winding voltage Vm was larger, so start-up capacitance voltage Vc is also larger, and the corresponding voltage vector relations is as shown in Figure 2; When the ac fan stall, there is not counterelectromotive force on the auxiliary winding, auxiliary winding voltage Vm is then smaller, so start-up capacitance voltage Vc is also smaller, corresponding vector relations such as Fig. 3.
In normal operation with during stall, the above-mentioned characteristic of start-up capacitance and auxiliary winding voltage judges whether the motor of ac fan the stall fault occurs according to above-mentioned ac fan in the present invention.
As shown in Figure 4, be alternating-current fan fault detection circuit embodiment's of the present invention schematic representation.In the present embodiment, fault-detecting circuit comprises voltage detection unit 41, differential amplification unit 42, peak detection unit 43 and the voltage comparison unit 44 that connects successively, wherein voltage detection unit 41 is connected to the two ends of start-up capacitance or auxiliary winding, and voltage comparison unit 44 is the output varying level when ac fan normal operation and stall.
Voltage detection unit 41 is for detection of start-up capacitance or auxiliary winding both end voltage.Because start-up capacitance or auxiliary winding voltage difference when ac fan normal operation and stall is very obvious, therefore by can be easy to judge the state of ac fan to the detection of this voltage.
Differential amplification unit 42 is used for the detection voltage that voltage detection unit 41 obtains is carried out differential amplification.
Peak detection unit 43 be used for obtaining the output of differential amplification unit differential amplification voltage peak value and export this differential amplification voltage peak to voltage comparison unit 44.
Voltage comparison unit 44 is used for the peak value of differential amplification voltage and reference voltage relatively and at the differential amplification voltage peak greater than exporting varying level with less than reference voltage the time.Between the differential amplification voltage peak and the differential amplification voltage peak during stall of above-mentioned reference voltage when ac fan works.
As shown in Figure 5, be the circuit diagram of alternating-current fan fault detection circuit specific implementation among Fig. 4.Capacitor C 1 among this figure is the start-up capacitance (in actual applications, also can change auxiliary winding into) of AC motor, and its both end voltage is sinusoidal wave.
Voltage detection unit 41 comprises resistance R 1, R2, and these two resistance R 1, R2 are used for start-up capacitance C1 institute making alive is carried out dividing potential drop.Be used for current limliting by resistance R 3, R4, R5, R6(resistance R 3, R4) and operational amplifier U1 forms differential amplification unit 42(VCC and VEE is the power supply voltage of operational amplifier U1) and the end of resistance R 3, the R4 two ends, the other end that are connected to respectively resistance R 2 be connected respectively to first input end and the second input end of operational amplifier U1, first input end, the other end that one end of resistance R 5 is connected to operational amplifier U1 is connected to the output terminal of operational amplifier U1, and an end of resistance R 6 is connected to the second input end of operational amplifier U1, the other end ground connection.As resistance R3=R4, during R5=R6, the output voltage V 0=Vc of operational amplifier U1 * (R/ (R1+R)) * (R5/R3), wherein R=(2R2 * R3)/(R2+2R3).
Peak detection unit 43 comprises diode D1, capacitor C 2, resistance R 10, wherein an end ground connection of capacitor C 2, the other end are connected to the output terminal (being the output terminal of operational amplifier U1) of differential amplification unit 42 via the diode D1 of reversal connection, and resistance R 10 is connected to the two ends of capacitor C 2.If ignore the conduction voltage drop of diode D1, then operational amplifier U1 directly charges to capacitor C 2 by diode D1 when its output voltage V 0 is higher than the voltage V1 of capacitor C 2; When the output voltage V 0 of operational amplifier U1 was lower than the voltage V1 of capacitor C 2, capacitor C 2 was by resistance R 10 discharges.The duration of charge of above-mentioned capacitor C 2 much smaller than discharge time (resistance of resistance R 10 is larger, and the velocity of discharge of capacitor C 2 is slower), suitably select the resistance of resistance R 10 can make capacitor C 2 almost maintain the peak value of V0.
Consider in actual applications the pressure drop of diode D1, then the voltage V1 of capacitor C 2 almost maintains the conduction voltage drop Vd that the V0 peak value deducts diode D1, if the peak value of V0
The voltage of capacitor C 2 then
R=(2R2 * R3)/(R2+2R3) wherein.
By the analysis of front as can be known start-up capacitance C1(or auxiliary winding) voltage less (the start-up capacitance C1 voltage of establishing this moment is Vc_1) when voltage works at fan, during stall large (the start-up capacitance voltage of establishing this moment is Vc_2), the voltage V1 of same capacitor C 2 is also when normal operation when large (voltage of establishing the capacitor C 2 of this moment is V1_Normal) and stall less (voltage of establishing capacitor C 2 this moment is V1_Fault), then
R=(2R2 * R3)/(R2+2R3) wherein.
Resistance R 7, R8, R9 and comparator U3 consist of voltage comparison unit 44, and wherein resistance R 7 is used for current limliting, and the first input end of comparator U3 connects the output terminal of reference voltage, the second input end connection peak detection unit.
R8, R9 are used for providing reference voltage, its two sections institute's making alives and equal VCC-VEE, the mid-point voltage V2=VEE+ of resistance R 8, R9 (R9/ (R8+R9)) * (VCC-VEE) then, the first input end of this voltage input comparator U3.
Suitably select the value of R8, R9, when making the ac fan normal operation voltage of reference voltage V2 less than V1_Normal and leave certain pre-amount, simultaneously during stall the voltage of reference voltage V2 greater than V1_Fault and leave certain pre-amount.Namely when fan worked, start-up capacitance C1 voltage was that Vc_1 is larger, and the voltage V1_Normal of capacitor C 2 is greater than reference voltage V2, and the output voltage ERR of comparator U3 is high level, and the each several part voltage waveform as shown in Figure 6; When the stall fault appearred in motor, start-up capacitance voltage was that Vc_2 is less, and the voltage V1_Fault of corresponding capacitor C 2 is less than reference voltage V2, and comparator U3 output voltage ERR is low level, and namely low level namely represents the fault level, and the each several part waveform as shown in Figure 7.
Certainly, above-mentioned each unit can adopt the circuit with identical function to replace when specific implementation.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (8)
1. alternating-current fan fault detection circuit, it is characterized in that: comprise the voltage detection unit, differential amplification unit, peak detection unit and the voltage comparison unit that connect successively, wherein: described voltage detection unit, for detection of start-up capacitance or auxiliary winding both end voltage; Described differential amplification unit is used for the detection voltage that described voltage detection unit obtains is carried out differential amplification; Described peak detection unit, be used for obtaining the output of described differential amplification unit differential amplification voltage peak value and export described differential amplification voltage peak; Described voltage comparison unit, be used for the peak value of differential amplification voltage and reference voltage relatively and at the differential amplification voltage peak greater than exporting varying level with less than reference voltage the time, between the differential amplification voltage peak and the differential amplification voltage peak during stall of described reference voltage when ac fan works.
2. alternating-current fan fault detection circuit according to claim 1, it is characterized in that: described voltage detection unit comprises divider resistance R1, the R2 that is serially connected with described start-up capacitance or auxiliary winding two ends.
3. alternating-current fan fault detection circuit according to claim 2, it is characterized in that: described differential amplification unit comprises resistance R 3, R4, R5, R6 and operational amplifier U1, and two ends, the other end that the end of wherein said resistance R 3, R4 is connected to respectively one of them divider resistance is connected respectively to first input end and the second input end of operational amplifier U1; First input end, the other end that one end of described resistance R 5 is connected to operational amplifier U1 is connected to the output terminal of operational amplifier U1; One end of described resistance R 6 is connected to the second input end, the other end ground connection of operational amplifier U1.
4. alternating-current fan fault detection circuit according to claim 3 is characterized in that: the resistance of described resistance R 3, R4 equates, and the resistance of resistance R 5, R6 equates.
5. alternating-current fan fault detection circuit according to claim 1, it is characterized in that: described peak detection unit comprises diode D1, capacitor C 2 and resistance R 10, one end ground connection of wherein said capacitor C 2, the other end are connected to the output terminal of differential amplification unit via the diode D1 of reversal connection, and described resistance R 10 is connected to the two ends of described capacitor C 2.
6. alternating-current fan fault detection circuit according to claim 1, it is characterized in that: described voltage comparison unit comprises comparator U3, the first input end of this comparator U3 connects the output terminal that reference voltage, the second input end connect peak detection unit.
7. alternating-current fan fault detection circuit according to claim 6, it is characterized in that: described voltage comparison unit comprises resistance R 8, R9, described resistance R 8, R9 are serially connected with between two input voltage VCC, the VEE, and the mid point of these two resistance R 8, R9 is connected to the first input end of comparator.
8. each described alternating-current fan fault detection circuit according to claim 1-7 is characterized in that: described voltage comparison unit is exported high level, output low level when the ac fan stall when ac fan works.
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| CN201210407200.XA CN102996470B (en) | 2012-10-23 | 2012-10-23 | AC (alternating current) fan fault detection circuit |
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| CN201210407200.XA CN102996470B (en) | 2012-10-23 | 2012-10-23 | AC (alternating current) fan fault detection circuit |
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Cited By (6)
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| CN104343713A (en) * | 2014-01-20 | 2015-02-11 | 上海新时达电气股份有限公司 | Failure detection circuit of alternating current fan |
| CN104929923A (en) * | 2015-06-02 | 2015-09-23 | 常州市巍纳赛电子科技有限公司 | Fan detection system of jacquard |
| CN106224276A (en) * | 2016-08-26 | 2016-12-14 | 北京新能源汽车股份有限公司 | A kind of speed adjusting module pulse width modulation closed control circuit |
| 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 |
| CN112653093A (en) * | 2019-10-10 | 2021-04-13 | 惠州拓邦电气技术有限公司 | Method and device for preventing AC motor from stalling |
| CN117914228A (en) * | 2024-01-24 | 2024-04-19 | 江苏科流达电子科技有限公司 | Electric curtain locked-rotor reverse rotation detection, stroke calibration and motion compensation method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343713A (en) * | 2014-01-20 | 2015-02-11 | 上海新时达电气股份有限公司 | Failure detection circuit of alternating current fan |
| CN104343713B (en) * | 2014-01-20 | 2016-05-25 | 上海新时达电气股份有限公司 | The failure detector circuit of ac fan |
| CN104929923A (en) * | 2015-06-02 | 2015-09-23 | 常州市巍纳赛电子科技有限公司 | Fan detection system of jacquard |
| CN104929923B (en) * | 2015-06-02 | 2018-03-09 | 常州市巍纳赛电子科技有限公司 | A kind of fan detection system of jacquard |
| CN106224276A (en) * | 2016-08-26 | 2016-12-14 | 北京新能源汽车股份有限公司 | A kind of speed adjusting module pulse width modulation closed control circuit |
| CN106224276B (en) * | 2016-08-26 | 2019-01-25 | 北京新能源汽车股份有限公司 | A kind of speed adjusting module pulse width modulation closed control circuit |
| 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 |
| 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 |
| CN112653093A (en) * | 2019-10-10 | 2021-04-13 | 惠州拓邦电气技术有限公司 | Method and device for preventing AC motor from stalling |
| CN112653093B (en) * | 2019-10-10 | 2023-09-01 | 惠州拓邦电气技术有限公司 | Method and device for preventing alternating current motor from being locked |
| CN117914228A (en) * | 2024-01-24 | 2024-04-19 | 江苏科流达电子科技有限公司 | Electric curtain locked-rotor reverse rotation detection, stroke calibration and motion compensation method |
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