CN207764305U - A kind of circuit of detection three-phase alternating-current supply phase shortage - Google Patents
A kind of circuit of detection three-phase alternating-current supply phase shortage Download PDFInfo
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- CN207764305U CN207764305U CN201721893019.9U CN201721893019U CN207764305U CN 207764305 U CN207764305 U CN 207764305U CN 201721893019 U CN201721893019 U CN 201721893019U CN 207764305 U CN207764305 U CN 207764305U
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Abstract
The utility model discloses a kind of circuits of detection three-phase alternating-current supply phase shortage.The circuit includes：Signal sampling unit, rectification unit, optocoupler unit and phase shortage judging unit are rectified into direct current signal by every phase AC signal of signal sampling unit sampling three-phase alternating-current supply.The voltage waveform of direct current signal is detected using photo-coupler, phase shortage judging unit judges the phase shortage situation of three-phase alternating-current supply according to the voltage waveform of direct current signal.The phase shortage situation of three-phase alternating-current supply is detected using the circuit, the result of acquisition can be made more accurate, the mode of resistance decompression can improve the reliability of phase shortage report to avoid using when capacitance since capacitance deviation or capacitance reduction etc. cause the situation for reporting phase shortage situation by mistake.In addition, being detected voltage waveform using photo-coupler, the forceful electric power that can be exported to avoid three-phase alternating-current supply influences the light current of late-class circuit output, ensures to obtain accurate result.
Description
Technical field
The utility model relates to circuit detection technique field more particularly to a kind of circuit of detection three-phase alternating-current supply phase shortage.
Background technology
High-voltage frequency converter product carries out pile defection at the scene in application process, to the three-phase electricity in power cell, can be with
It is reported to controller to carry out emergent management phase shortage situation in time in three-phase electric power open phase, power cell is prevented to be lacked because of long-time
Phase state is run, and causes fault.Therefore it needs to be detected circuit, notifies phase shortage event at once in power cell phase shortage
Barrier normally provides safeguard for circuit, reduces equipment unnecessarily end-of-life state, causes economic loss.
As shown in Figure 1, three-phase electricity is carried out star-like connection by capacitance in the prior art, it is load with capacitance, passes through electricity
After holding the output voltage for reducing three-phase electricity, the phase shortage situation that the electric current in small signal three-phase circuit knows three-phase electricity is detected.Specifically
, it is separately connected optocoupler in each phase line and detects electric current in small signal three-phase electrical circuit, when the electric current in phase line is reduced to
Open-phase fault is quoted when optocoupler can not work normally.Since capacitance is influenced by service life and quality requirements, capacitance is easily caused
Situations such as deviation and capacitance reduce so that the case where reporting open-phase fault by mistake often occurs in three phase mains.For example, when the capacitance of capacitance
When reduction, voltage of the voltage after the capacitance decompression of phase line output also reduces, and reduces so as to cause the electric current for flowing to optocoupler
So that optocoupler can not work normally, open-phase fault is quoted immediately.But if the normal capacitance of capacitance, the then voltage exported want high,
Optocoupler normally.In addition, using this kind of method, when only not exported there are one phase line in three phase mains, transistor base
Current reduction, so that triode is ended, to quote circuit open-phase fault；When three phase lines in three phase mains are not defeated
Go out, i.e., three phase mains out of power when, triode also be cut-off state, to quote circuit open-phase fault, thereby resulting in can not judge
Three phase mains is non-full-phase state or off-position so that maintenance personnel can not learn specific failure cause, cause to safeguard tired
It is difficult.In addition, used more capacitor element and optocoupler using this kind of detection mode, by capacitor element is of high cost and the longevity
The influence of life, more demanding to capacitive property, the situations such as integrated circuit complexity component is excessive make the cost of circuit increase.
Utility model content
Pile defection in order to solve the three phase mains that above-mentioned background technology proposes can not correctly quote asking for open-phase fault
Topic, the utility model provide a kind of circuit of detection three-phase alternating-current supply phase shortage.
One side according to the present utility model, provides a kind of circuit of detection three-phase alternating-current supply phase shortage, which includes：
Signal sampling unit, rectification unit, optocoupler unit and phase shortage judging unit；
Signal sampling unit, including the first dropping resistor, the second dropping resistor and third dropping resistor, each dropping resistor
The phase being correspondingly connected in three-phase alternating-current supply is configured as every phase AC signal of sampling three-phase AC power；
Rectification unit is configured as the three-phase ac signal that signal sampling unit sampling obtains being rectified into direct current signal；
Optocoupler unit, including photo-coupler are configured as the electric conduction of the voltage value and photo-coupler according to direct current signal
The size comparison result of pressure value, detects the voltage waveform of direct current signal；
Phase shortage judging unit is configured as judging the phase shortage feelings of three-phase alternating-current supply according to the voltage waveform of direct current signal
Condition.
Preferably, rectification unit includes：First diode, the second diode, third diode, the 4th diode, the 5th
Diode, the 6th diode；
The anode of first diode and the cathode of the second diode connect the first dropping resistor jointly, and third diode is just
The second dropping resistor of connection, the anode of the 5th diode and the cathode of the 6th diode are total jointly for the cathode of pole and the 4th diode
With connection third dropping resistor；
The cathode of first diode, third diode and the 5th diode connects the positive output of composition direct current signal jointly
End, the negative output terminal of the common connection composition direct current signal of anode of the second diode, the 4th diode and the 6th diode.
Preferably, optocoupler unit further includes the first capacitance, the second capacitance, the 4th resistance, the 5th resistance and zener diode；
The first end of 4th resistance is connect with positive output end, and the second end of the 4th resistance and the cathode of zener diode connect
It connects, the anode of zener diode is connect with the first input end of photo-coupler；The first end of first capacitance and zener diode
Anode connection, the second end of the first capacitance and the second input terminal of photo-coupler connect；Second input terminal of photo-coupler with it is negative
Output end connects；
First output end of the first end of the 5th resistance and photo-coupler connection and as the output end of optocoupler unit, the 5th
The second end of resistance is connect with external power；The first end of second capacitance and the first output end of photo-coupler connect, the second electricity
The second end of appearance and the second output terminal of photo-coupler connect, the second output terminal ground connection of photo-coupler.
Preferably, circuit further includes waveform processing unit, is arranged between optocoupler unit and phase shortage judging unit, including the
Six resistance, third capacitance and phase inverter；
The first end of 6th resistance is connect with the output end of optocoupler unit, the input of the second end and phase inverter of the 6th resistance
End connection；
The first end of third capacitance and the input terminal of phase inverter connect, the second end ground connection of third capacitance；
The output end of phase inverter is connect with phase shortage judging unit.
Preferably, phase shortage judging unit is specifically used for, when the voltage of direct current signal is permanent High level signal, judgement three
Phase AC power is that three-phase is normal；When the voltage of direct current signal is periodical low pulse signal, judgement three-phase alternating-current supply is
Three-phase lacks a phase；Direct current signal voltage be continue low level signal when, judgement three-phase alternating-current supply for three-phase lack two-phase or
It is no electricity.
The beneficial effects of the utility model：
The technical solution of the utility model is dropped by connecting dropping resistor in each phase line of three-phase alternating-current supply
Pressure carries out rectification processing to the three-phase alternating-current supply after decompression, exports direct current signal all the way.Due to resistance resistance value parameter more
Stablize, can accurately export the voltage after three-phase alternating-current supply decompression, avoids when using capacitor element decompression since capacitance drops
The problem of the low voltage output inaccuracy for making three-phase alternating-current supply.Utilize the voltage of the direct current signal after photo-coupler detection decompression
Waveform, the situation of change that can accurately obtain three-phase alternating-current supply output are kept away to obtain the phase shortage situation of three-phase alternating-current supply
Exempt to judge to judge by accident caused by the phase shortage situation of three-phase alternating-current supply by the on and off of triode.Simultaneously as this practicality
The output of three-phase alternating-current supply is carried out rectification output direct current signal all the way by novel scheme, therefore is using a photo-coupler
Pile defection can be completed, reduces the electronic component in detection circuit, while the error in judgement of detection circuit can be reduced, is saved
Circuit cost.
Description of the drawings
Fig. 1 is the physical circuit figure that the prior art detects three-phase alternating-current supply phase shortage；
Fig. 2 is the flow chart of the method for the detection three-phase alternating-current supply phase shortage of the embodiment of the present invention；
Fig. 3 is the functional block diagram of the detection three-phase alternating-current supply phase shortage of the utility model embodiment；
Fig. 4 is the physical circuit figure of the detection three-phase alternating-current supply phase shortage of the utility model embodiment.
Specific implementation mode
The technical issues of in order to solve to propose in background technology, inventor expect being combined with photo-coupler using resistance decompression
The mode of detection detects the phase shortage situation of three-phase alternating-current supply, can accurately obtain the phase shortage situation of three-phase alternating-current supply.To make
The purpose of this utility model, technical solution and advantage are clearer, make to the utility model embodiment below in conjunction with attached drawing
Further it is described in detail.
As shown in Fig. 2, detecting three-phase alternating current using the circuit of detection three-phase alternating-current supply phase shortage provided by the utility model
The method of power phase shortage, including：
Step S10：Every phase AC signal of mode sampling three-phase AC power is depressured using resistance；
Each phase line exports AC signal in three-phase alternating-current supply, and the AC signal exported is high-voltage signal, unsuitable
Directly measure.By the way of resistance decompression, high-voltage signal is reduced to low pressure by corresponding resistance of connecting in each phase line
Signal, to be detected.Specifically, by each phase line series connection dropping resistor of three-phase alternating-current supply, each phase line warp is obtained
AC signal after dropping resistor partial pressure.Series resistance can carry out current limliting partial pressure in circuit, by high-voltage large current signal
It is reduced to low-voltage low current signal, to be detected analysis or to be applied to light current occasion.Resistance can both lead to AC signal or
Direct current signal can be led to, extra influence is not present to circuit in the effect in addition to carrying out decompression current limliting.
Step S20：The three-phase ac signal that sampling obtains is rectified into direct current signal；
AC signal output by resistance decompression is still AC signal, and the detection of AC signal is opposite and direct current signal
It is complex, it is therefore desirable to which that the AC signal is converted into direct current signal.Connecting diode after resistance can be by AC signal
Rectification forms direct current signal.Through over commutation, the three-phase alternating current of three-phase alternating-current supply output can form direct current with rectification, pass through
The variation of detection direct current can obtain the output variation of three-phase alternating-current supply so that more hold to three-phase alternating-current supply detection
Easily, testing result can be obtained faster.In addition, direct current more intuitively reacts the output situation of three-phase alternating-current supply, it is not required to
Carry out extra calculation processing.
Step S30：The voltage waveform that direct current signal is detected using photo-coupler is judged according to the voltage waveform of direct current signal
The phase shortage situation of three-phase alternating-current supply.
Photo-coupler converts electrical signals to optical signal, then converts optical signals to electric signal and exported so that input
Electrical isolation is formed between end and output end, the normal work between not influencing.Photo-coupler is only received in input terminal
To rated operational current input when can just be connected, remaining situation is then ended.It is constant in circuit load and be not present LC device
In the case of, current waveform and the voltage waveform of direct current signal change linearly.In direct current signal rear end series connection photo-coupler, profit
The voltage waveform of direct current signal can be detected with photo-coupler, it is possible thereby to the situation of change of direct-flow signal voltage waveform is obtained,
The variation of the direct-flow signal voltage waveform can be more intuitively observed simultaneously.
Specifically, when three-phase alternating-current supply works normally, three phase lines export AC signal, and rectification forms direct current letter
After number, the voltage of direct current signal is permanent High level signal, and circuit can effectively work, and can make photo-coupler by the electric current in circuit
Continuous illumination judges that three-phase alternating-current supply is normal for three-phase at this time.
When only there are two phase lines to export AC signal in three phase lines of three-phase alternating-current supply, another phase line does not export
When, the direct current signal that rectification is formed leads to of short duration moment no-voltage in circuit loop at the time of there are voltages down to zero at this time,
Down to zero or Weak current is only existed by the electric current of photo-coupler so that photo-coupler can not be connected.It is straight in the case of this kind
When the voltage for flowing signal output is periodical low pulse signal, thus judge that the three-phase of three-phase alternating-current supply output lacks a phase, i.e.,
There are a phase lines not to export.
When do not exported there are two phase lines in three phase lines of three-phase alternating-current supply or three phase lines without output i.e. without
When the situation of electricity, voltage is extremely low in no-voltage or circuit always in circuit loop, and photo-coupler ends always, at this time direct current signal
The voltage of output is to continue low level signal, judges that three-phase alternating-current supply is that three-phase lacks two-phase or without electricity at this time.
It should be noted that if the accuracy of detection of photo-coupler is improved, exist when in three phase lines of three-phase alternating-current supply
Two phase lines do not export, when only having output there are one phase line, since there is also of short duration height electricity for the voltage of DC signal output
It is flat, therefore photo-coupler can also have of short duration conducting, turn-on time when only than one phase line of turn-on time does not export
It is short；Only when three phase lines do not export, photo-coupler can just end always, and the voltage of DC signal output is lasting low
Level.Therefore, the accuracy of detection of photo-coupler is improved, can accurately obtain the specific phase shortage situation of three-phase alternating-current supply.
After the AC signal rectification of three-phase alternating-current supply output forms direct current signal, the variation of the direct current signal is excessive, i.e.,
There are larger fluctuations for voltage.If not handling the fluctuation, it is directly accessed photo-coupler, photo-coupler may be punctured,
It is set to can not work normally, to which the phase shortage situation of three-phase alternating-current supply can not be obtained.Therefore, it is necessary to the direct current letter after rectification
Number output voltage carry out voltage stabilizing and current limliting processing.Preferably, before the voltage waveform that direct current signal is detected using photo-coupler,
Voltage stabilizing and current limliting processing are carried out to the voltage of direct current signal.Specifically, the input terminal in rectification output end, that is, photo-coupler is connected
Resistance carries out current limliting, ensures that the electric current of photo-coupler input terminal is not more than rated operational current, avoids the hair of breakdown photo-coupler
Light device, it is ensured that photophore being capable of normal luminous work.Furthermore it is also possible in the input terminal series voltage stabilizing diode of photo-coupler,
When the voltage of DC signal output reaches certain value, zener diode is made to be connected, photo-coupler is started to work, by direct current signal
In voltage fluctuation disturbance reject, improve the working efficiency of circuit.
The light-receiving device of optocoupler output is generally phototriode, and when photo-coupler ends, phototriode exports
High level signal, when conducting, export low level signal.That is the voltage of three-phase alternating-current supply output is optical coupling when continuing low level
Device cut-off output high level signal, when the voltage of three-phase alternating-current supply output is permanent High level, photo-coupler conducting output is low
Level signal.To make the output of photo-coupler and the output of three-phase alternating-current supply be consistent, the output to photo-coupler is needed
Carry out reverse phase processing.Preferably, right before the phase shortage situation for judging three-phase alternating-current supply according to the voltage waveform of direct current signal
The voltage waveform for the direct current signal that photo-coupler detects is filtered and reverse phase processing.Capacitance and phase inverter specifically may be used
It is filtered and reverse phase, the low level signal that photo-coupler exports when being connected is filtered and reverse phase processing, can be disturbed
High level signal that is smaller and being easy to detection.In three-phase alternating-current supply there are when phase shortage situation, the processing of filtered and reverse phase is defeated
The voltage waveform variation gone out becomes apparent, and can more intuitively reflect the phase shortage situation of three-phase alternating-current supply.It is handled by reverse phase,
The output variation of photo-coupler is consistent with the output variation of three-phase alternating-current supply, makes the specific phase shortage feelings of three-phase alternating-current supply
Condition becomes easier to judge.
Fig. 3 is the functional block diagram of the detection three-phase alternating-current supply phase shortage of the utility model embodiment；Fig. 4 is the utility model
The physical circuit figure of the detection three-phase alternating-current supply phase shortage of embodiment.In conjunction with shown in Fig. 3 and Fig. 4, the utility model embodiment carries
The circuit of the detection three-phase alternating-current supply phase shortage of confession includes：Signal sampling unit 10, rectification unit 20, optocoupler unit 30 and phase shortage
Judging unit 40.
Signal sampling unit 10 includes the first dropping resistor R1, the second dropping resistor R2 and third dropping resistor R3, each
Dropping resistor is correspondingly connected with the phase in three-phase alternating-current supply 60, is configured as believing per mutually exchange for sampling three-phase AC power 60
Number.Specifically, the first dropping resistor R1 is connect with the first phase line 1, and the second dropping resistor R2 is connect with the second phase line 2, third drop
Piezoresistance R3 is connect with third phase line 3.Resistance is also different according to the different effects for carrying out decompression current limliting to circuit of resistance value, specifically
It is bigger for resistance, voltage drop it is lower, electric current also becomes smaller.Resistance in signal sampling unit 10 can be according to actually answering
With being chosen, the resistance in multiple resistance increasing circuits can be connected in each phase line, so that three-phase alternating-current supply 60 is every
The output voltage of one phase line drops to the range that can be detected application, resistance number of the utility model to signal sampling unit 10
It is not construed as limiting with resistance value.
Rectification unit 20 is configured as the three-phase ac signal that the sampling of signal sampling unit 10 obtains being rectified into direct current letter
Number.When carrying out rectification to AC signal, can be used full-wave rectification and halfwave rectifier, full-wave rectification to the positive period of AC signal and
Negative cycle is all exported, and halfwave rectifier is only to exporting the positive period of AC signal.In the present embodiment, detection three is needed
The entire output process of phase AC power 60, it is preferred to use full-wave rectification, i.e., to the output of 60 each phase line of three-phase alternating-current supply
AC signal carries out full-wave rectification and forms direct current signal respectively, positive period and negative cycle is exported so that testing result
It is more accurate.Specifically, rectification unit 20 includes the first diode D1, the second diode D2, third diode D3, the four or two pole
Pipe D4, the 5th diode D5, the 6th diode D6.
The anode of first diode D1 and the cathode of the second diode D2 connect the first dropping resistor R1, the three or two pole jointly
The anode of pipe D3 and the cathode of the 4th diode D4 connect the second dropping resistor R2, the anode of the 5th diode D5 and the 6th jointly
The cathode connection third dropping resistor R3 of diode D6.First diode D1, third diode D3 and the 5th diode D5's is negative
Extremely common connection composition positive output end, the common connection of anode of the second diode D2, the 4th diode D4 and the 6th diode D6
Form negative output terminal.
As shown in figure 4, by taking the first phase line 1 as an example, when the AC signal of the first phase line 1 output is in positive period, the one or two
The positive terminal potential of pole pipe D1 is higher than zero, and the electric current in circuit flows to negative pole end from the positive terminal of the first diode D1, passes through
It is flowed back to from the positive terminal of the second diode D2 after load, completes electric energy output services；The AC signal of first phase line 1 output is in
When negative cycle, the positive terminal potential of the first diode D1 is less than zero, positive terminal of the electric current in circuit from the second diode D2
The positive terminal for flowing to the first diode D1 completes electric energy output services after overload.Using the rectifier system, three-phase alternating current
The AC signal that power supply 60 exports can be exported all, ensured the continuity of voltage output, kept the result of acquisition clearer
React the phase shortage situation of three-phase alternating-current supply 60.
Optocoupler unit 30, including photo-coupler OC are configured as according to the voltage value of direct current signal and photo-coupler OC
The size comparison result of turn-on voltage, detects the voltage waveform of direct current signal.The input terminal of photo-coupler OC is light-emitting diodes
Pipe, output end is phototriode.The light emitting diode of input terminal shines when receiving rated operational current, phototriode
It receives illumination to be switched on, i.e. photo-coupler OC is switched on, and is exported accordingly.That is, when Light-Emitting Diode both ends
When voltage value reaches the turn-on voltage of photo-coupler OC, Light-Emitting Diode just shines, and photo-coupler OC is connected at this time.Optical coupling
The cathode of the just extremely first input end of photo-coupler OC of the light emitting diode of device OC, light emitting diode is photo-coupler OC's
Second input terminal；The current collection of phototriode extremely the first output end of photo-coupler OC, the transmitting extremely light of phototriode
The second output terminal of coupler OC.
Optocoupler unit 30 further includes the first capacitance C1, the second capacitance C2, the 4th resistance R4, two pole the 5th resistance R5 and voltage stabilizing
Pipe D7.The collector of phototriode is connect with the first end of the 5th resistance R5, and the first end of the 5th resistance R5 is as optocoupler list
The output end of member 30, the second end of the 5th resistance R5 are connect with power supply；The emitter of phototriode is grounded.5th resistance R5 is
The effect of circuit is protected, power supply is directly grounded when phototriode being avoided to be connected.Second capacitance C2 is connected to phototriode
Between collector and emitter, i.e., the collector of the first end of the second capacitance C2 and phototriode connects, the second capacitance C2's
The emitter of second end and phototriode connects.The collector output optical coupler OC of phototriode is to direct-flow signal voltage
The testing result of waveform, if voltage is permanent High level signal, photo-coupler OC is constantly on, and bright triode is also led always
Logical, collector exports lasting low level signal；If voltage is periodically pulsing signal, photo-coupler OC believes in high impulse
Number when be connected, when low pulse signal, ends, and collector also exports periodically pulsing signal；If without voltage, photo-coupler OC
Cut-off, collector export lasting high level signal.
In optocoupler unit 30, the first end of the 4th resistance R4 is connect with positive output end, the second end of the 4th resistance R4 with
The cathode of zener diode D7 connects, and the anode of zener diode D7 is connect with the first input end of photo-coupler OC；First electricity
The first end for holding C1 is connect with the anode of zener diode D7, the second end of the first capacitance C1 and the second input of photo-coupler OC
End connection；The second input terminal of photo-coupler OC is connect with negative output terminal.What the 4th resistance R4 mainly exported rectification unit 20
Direct current signal carries out decompression current limliting；Zener diode D7 mainly carries out stablizing control to the voltage for being input to photo-coupler OC input terminals
System, reducing voltage disturbance influences the work of photo-coupler OC；First capacitance C1 connects with the light emitting diode of photo-coupler OC, dimension
It keeps steady and determines the current potential at the both ends photo-coupler OC, slow down the current potential transformation of light emitting diode positive and negative anodes, ensure the steady of light emitting diode
Fixed work.Three-phase ac signal passes through 20 rectification of rectification unit, the electricity of the direct-flow signal voltage value of acquisition relative to AC signal
Pressure amplitude value increases, and to which electric current also increases accordingly, if unfavorable carry out current limliting with resistance, excessive electric current can puncture optical coupling
The light emitting diode of device OC input terminals so that circuit cisco unity malfunction can not obtain the phase shortage situation of three-phase alternating-current supply 60.
Therefore series resistance carries out current limliting after direct current output, ensures the normal work of circuit.
Phase shortage judging unit 40 is configured as judging the phase shortage of three-phase alternating-current supply 60 according to the voltage waveform of direct current signal
Situation.Phase shortage judging unit 40 is processor, can obtain the output state of photo-coupler OC, and obtain three according to output state
The phase shortage situation of phase AC power 60.Processor can preserve the phase shortage situation of acquisition, subsequently be checked for user, and be directed to phase shortage
Situation is analyzed, to find the method for solving the problems, such as phase shortage.
Due to the output of photo-coupler OC and the output of three-phase alternating-current supply 60 on the contrary, i.e. 60 fault-free of three-phase alternating-current supply
When normal output, photo-coupler OC exports lasting low level, and when the failure of three-phase alternating-current supply 60 does not export, light
Coupler OC exports lasting high level.Output and the output of three-phase alternating-current supply 60 to make photo-coupler OC are consistent,
In the present embodiment, circuit further includes the waveform processing unit 50 being arranged between optocoupler unit 30 and phase shortage judging unit 40,
Waveform processing unit 50 is configured as being filtered the output of optocoupler unit 30 and reverse phase is handled.Waveform processing unit 50 includes
6th resistance R6, third capacitance C3 and phase inverter Z1.The first end of 6th resistance R6 connects with the first output end of photo-coupler OC
It connects, the second end of the 6th resistance R6 is connect with the input terminal of phase inverter Z1；The first end of third capacitance C3 is defeated with phase inverter Z1's
Enter end connection, the second end ground connection of third capacitance C3；The output end of phase inverter Z1 is connect with phase shortage judging unit 40.6th resistance
The level that R6 exports the power supply being connect with the 5th resistance R5 reduces, it is ensured that the normal work of phase inverter Z1.Phase inverter Z1 will be low
Level translation is high level output, converts high level to low level output, and output is intended to square wave output, can be brighter
The aobvious low and high level variation for embodying pulse signal.By the filtering reverse phase of third capacitance C3 and phase inverter Z1, photo-coupler
The voltage waveform difference of OC outputs is more obvious, can more intuitively find out the phase shortage situation of three-phase alternating-current supply 60.
After waveform processing unit 50 is arranged, phase shortage judging unit 40 can pass through the test point of detection phase inverter Z1 output ends
TP49 obtains the output situation of phase inverter Z1, so that it is determined that the phase shortage situation of three-phase alternating-current supply 60.Specifically, working as test point
When TP49 exports permanent High level signal, direct current signal is also lasting high level signal, at this time the three of three-phase alternating-current supply 60
A phase line normally exports；When the periodical low pulse signal of test point TP49 outputs, direct current signal is also periodic low level
Signal, phase line normally exports there are two three-phase alternating-current supplies 60 at this time, another phase line breaks down, i.e., three-phase lacks a phase；
When test point TP49 outputs continue low level signal, direct current signal is lasting low level signal, at this time three-phase alternating-current supply
60 at least two phase line failures do not export, or there is a situation where without electricity.Phase shortage judging unit 40 is by detecting photo-coupler OC
Output, the voltage waveform situation of direct current signal is known, so as to accurately obtain the specific phase shortage feelings of three-phase alternating-current supply 60
Condition avoids that error reporting phase shortage situation occurs, reduces the unnecessary end-of-life state of equipment, cause economic loss.
In conclusion being depressured by dropping resistor of connecting in each phase line of three-phase alternating-current supply, three-phase is obtained
Every phase AC signal of AC power output exports the direct current signal all the way convenient for detection, is detected by photo-coupler after rectification
The voltage waveform of direct current signal judges the phase shortage situation of three-phase alternating-current supply according to the voltage waveform.Using the detection circuit, three
The voltage of phase AC power output is depressured accordingly by dropping resistor, switchs to low pressure electric signal from high-voltage signal, just
In detection and analysis；And AC signal rectification is formed into direct current signal, it can more intuitively reflect the output of three-phase alternating-current supply
Situation of change detects the voltage waveform of direct current signal using photo-coupler, you can detects the variation of three-phase alternating-current supply output
Situation knows phase shortage result.When there are a certain phase lines without output for three-phase alternating-current supply, photo-coupler is in a certain period of time
Cut-off；If there are two or more phase lines without output, photo-coupler can end for a long time, from being switched off and on for photo-coupler
Time change it can be learnt that three-phase alternating-current supply accurate phase shortage situation, avoid occur wrong report cause economic loss.In addition, sharp
With photo-coupler detect voltage waveform, can by three-phase alternating-current supply export forceful electric power and photo-coupler late-class circuit light current into
Row isolation, avoids the two from influencing each other, and improves the reliability of output result.Meanwhile the processor of phase shortage judging unit can be protected
Phase shortage situation is deposited, the reason of analysis causes phase shortage is carried out for user, takes safeguard procedures early, avoid breaking down.
Above description is only a specific implementation of the present invention, under the above-mentioned introduction of the utility model, this field
Technical staff can carry out other improvement or deformation on the basis of the above embodiments.It will be understood by those skilled in the art that
Above-mentioned specific descriptions only preferably explain the purpose of this utility model, and the scope of protection of the utility model should be with claim
Protection domain subject to.
Claims (5)
1. a kind of circuit of detection three-phase alternating-current supply phase shortage, which is characterized in that the circuit includes：It is signal sampling unit, whole
Flow unit, optocoupler unit and phase shortage judging unit；
The signal sampling unit, including the first dropping resistor, the second dropping resistor and third dropping resistor, each dropping resistor
The phase being correspondingly connected in the three-phase alternating-current supply is configured as sampling every phase AC signal of the three-phase alternating-current supply；
The rectification unit is configured as the three-phase ac signal that the signal sampling unit sampling obtains being rectified into direct current letter
Number；
The optocoupler unit, including photo-coupler are configured as the voltage value according to the direct current signal and the photo-coupler
Turn-on voltage size comparison result, detect the voltage waveform of the direct current signal；
The phase shortage judging unit is configured as judging the phase shortage of three-phase alternating-current supply according to the voltage waveform of the direct current signal
Situation.
2. circuit according to claim 1, which is characterized in that the rectification unit includes：First diode, the two or two pole
Pipe, third diode, the 4th diode, the 5th diode, the 6th diode；
The anode of first diode and the cathode of second diode connect first dropping resistor jointly, and described the
The anode of three diodes and the cathode of the 4th diode connect second dropping resistor jointly, the 5th diode
The cathode of positive and described 6th diode connects the third dropping resistor jointly；
The cathode of first diode, the third diode and the 5th diode connects the composition direct current letter jointly
Number positive output end, second diode, the 4th diode and the 6th diode the common connection composition of anode
The negative output terminal of the direct current signal.
3. circuit according to claim 2, which is characterized in that the optocoupler unit further include the first capacitance, the second capacitance,
4th resistance, the 5th resistance and zener diode；
The first end of 4th resistance is connect with the positive output end, second end and two pole of the voltage stabilizing of the 4th resistance
The cathode of pipe connects, and the anode of the zener diode is connect with the first input end of the photo-coupler；First capacitance
The anode of first end and the zener diode connect, the second end of first capacitance and the second of the photo-coupler defeated
Enter end connection；Second input terminal of the photo-coupler is connect with the negative output terminal；
The first end of 5th resistance connect with the first output end of the photo-coupler and as the defeated of the optocoupler unit
The second end of outlet, the 5th resistance is connect with external power；The first end of second capacitance and the photo-coupler
First output end connects, and the second end of second capacitance is connect with the second output terminal of the photo-coupler, the optical coupling
The second output terminal of device is grounded.
4. circuit according to claim 1, which is characterized in that the circuit further includes waveform processing unit, is arranged in institute
It states between optocoupler unit and the phase shortage judging unit, including the 6th resistance, third capacitance and phase inverter；
The first end of 6th resistance is connect with the output end of the optocoupler unit, the second end of the 6th resistance with it is described
The input terminal of phase inverter connects；
The first end of the third capacitance is connect with the input terminal of the phase inverter, the second end ground connection of the third capacitance；
The output end of the phase inverter is connect with the phase shortage judging unit.
5. according to claim 1-4 any one of them circuits, which is characterized in that the phase shortage judging unit is specifically used for,
When the voltage of the direct current signal is permanent High level signal, judgement three-phase alternating-current supply is normal for three-phase；Believe in the direct current
Number voltage when being periodical low pulse signal, judgement three-phase alternating-current supply lacks a phase for three-phase；In the electricity of the direct current signal
When pressure is continues low level signal, judgement three-phase alternating-current supply is that three-phase lacks two-phase or without electricity.
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| CN201721893019.9U CN207764305U (en) | 2017-12-28 | 2017-12-28 | A kind of circuit of detection three-phase alternating-current supply phase shortage |
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| CN201721893019.9U CN207764305U (en) | 2017-12-28 | 2017-12-28 | A kind of circuit of detection three-phase alternating-current supply phase shortage |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037377A (en) * | 2017-12-28 | 2018-05-15 | 北京动力源科技股份有限公司 | A kind of method and circuit for detecting three-phase alternating-current supply phase shortage |
| CN109387708A (en) * | 2018-12-08 | 2019-02-26 | 中国科学院宁波材料技术与工程研究所 | A kind of the pile defection device and its detection method of n phase power supply |
| CN112068024A (en) * | 2020-09-30 | 2020-12-11 | 中国航空工业集团公司雷华电子技术研究所 | Fault detection method and fault detection circuit for three-phase alternating current source |
| CN111521886B (en) * | 2020-04-28 | 2021-07-16 | 美的集团股份有限公司 | Phase-loss detection circuit and air conditioner |
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2017
- 2017-12-28 CN CN201721893019.9U patent/CN207764305U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037377A (en) * | 2017-12-28 | 2018-05-15 | 北京动力源科技股份有限公司 | A kind of method and circuit for detecting three-phase alternating-current supply phase shortage |
| CN109387708A (en) * | 2018-12-08 | 2019-02-26 | 中国科学院宁波材料技术与工程研究所 | A kind of the pile defection device and its detection method of n phase power supply |
| CN111521886B (en) * | 2020-04-28 | 2021-07-16 | 美的集团股份有限公司 | Phase-loss detection circuit and air conditioner |
| CN112068024A (en) * | 2020-09-30 | 2020-12-11 | 中国航空工业集团公司雷华电子技术研究所 | Fault detection method and fault detection circuit for three-phase alternating current source |
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