CN206906560U - A kind of three-phase power detection circuit - Google Patents
A kind of three-phase power detection circuit Download PDFInfo
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- CN206906560U CN206906560U CN201720922174.2U CN201720922174U CN206906560U CN 206906560 U CN206906560 U CN 206906560U CN 201720922174 U CN201720922174 U CN 201720922174U CN 206906560 U CN206906560 U CN 206906560U
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Abstract
The utility model discloses a kind of three-phase power detection circuit, including Power Entry Module, optocoupler U1 and signal output module, it is characterised in that Power Entry Module includes：First resistor R1, first resistor R1 one end are connected with zero-power line N, and the other end is connected with optocoupler U1 the first pin and the 5th resistance R5；Second resistance R2,3rd resistor R3 and the 4th resistance R4, second resistance R2,3rd resistor R3 and the 4th resistance R4 one end are connected with three-phase A, B and C of power firestreak respectively, and the other end is connected with optocoupler U1 second pin and the 5th resistance R5；5th resistance R5, the 5th resistance R5 one end are connected with optocoupler U1 the first pin, and the other end is connected with optocoupler U1 second pin.When open phases of three-phase power source or it is under-voltage when, there is voltage in the 5th resistance R5 both ends, optocoupler U1 conductings, export detection signal, and so as to realize three-phase electric power open phase, the detection of under-voltage circuit integrating, circuit structure is simple.
Description
Technical field
It the utility model is related to electric and electronic technical field, more particularly to a kind of three-phase power detection circuit.
Background technology
In the electrical equipment such as equipment such as three phase arc welder, threephase motor powered using three-phase electricity, often due to big
The fluctuation of the startup of power termination or power network in itself, causes the under-voltage of three-phase voltage, and three-phase electricity consumption situation it is unbalanced then
The phase shortage of three-phase electricity is likely to result in, it can also happen that user's wrong voltage, such as wrong by 220V voltages when actual use
It is connected to 380V voltages or three phase connections is missed and result in phase shortage, and these situations are likely to the damage for causing electrical equipment,
Even cause the failure of power network, cause serious consequence.
In the prior art, Publication No. CN103457349B Chinese patent literature discloses a kind of SCM Based double
Power conversion control circuit, including conventional power phase failure signal detection circuit, by four groups of current-limiting resistances, Signal Regulation resistance, light
Coupling, three groups of piezo-resistances and electrochemical capacitor composition, the corresponding three-phase and zero line for connecing conventional power supply of four groups of current-limiting resistances point, each limit
First pin of another termination optocoupler of leakage resistance, three groups of piezo-resistances be correspondingly arranged at respectively conventional power supply three-phase and zero line it
Between, the crus secunda connecting to neutral line of optocoupler, the pin of optocoupler the 3rd connects Signal Regulation resistance and electrochemical capacitor, the pin of optocoupler the 4th access telecommunications
Number, the positive pole of electrochemical capacitor connects the I/O interfaces of single-chip microcomputer；Also include conventional power supply and owe over-pressed signal deteching circuit.But the base
The phase shortage of conventional power supply in the dual power supply conversion control circuit of single-chip microcomputer and under-voltage detection need to carry out in two circuits,
Thus, circuit structure is complex.
Therefore, how to realize in same circuit while carry out that three phase mains is under-voltage and the detection of phase shortage, simplify circuit knot
It is configured to urgent problem to be solved.
Utility model content
Therefore, the technical problems to be solved in the utility model is that solution three phase mains is under-voltage and phase shortage parallel circuit detects,
The problem of circuit structure is complex.
Therefore, according in a first aspect, the utility model embodiment provides a kind of three-phase power detection circuit, including power supply
Input module, optocoupler U1 and signal output module, it is characterised in that Power Entry Module includes：First resistor R1, first resistor
R1 one end is connected with zero-power line N, and the other end is connected with optocoupler U1 the first pin and the 5th resistance R5；Second resistance R2,
3rd resistor R3 and the 4th resistance R4, second resistance R2,3rd resistor R3 and the 4th resistance R4 one end respectively with power firestreak
Three-phase A, B connected with C, the other end is connected with optocoupler U1 second pin and the 5th resistance R5；5th resistance R5, the 5th resistance
R5 one end is connected with optocoupler U1 the first pin, and the other end is connected with optocoupler U1 second pin.
Alternatively, the 5th resistance R5 is adjustable resistance.
Alternatively, second resistance R2,3rd resistor R3 and the 4th resistance R4 are a resistance or multiple series resistances.
Alternatively, optocoupler U1 includes：First pin, the first pin are the positive pole of light emitting diode；Second pin, second draws
Pin is the negative pole of light emitting diode；3rd pin, the 3rd pin are the colelctor electrode of phototriode；4th pin, the 4th pin
For the emitter stage of phototriode.
Alternatively, signal output module includes：Out-put supply, the positive pole VCC and optocoupler U1 of out-put supply the 3rd pin
Connection；6th resistance R6, the 6th resistance R6 one end are connected with optocoupler U1 the 4th pin, the other end and the 7th resistance R7,
Two electric capacity C2 connect with signal output part；7th resistance R7 other end ground connection；Second electric capacity C2 other end ground connection.
Alternatively, signal output module also includes：First electric capacity C1, the first electric capacity C1 one end is drawn with the 3rd of optocoupler U1
Pin is connected with the positive pole VCC of out-put supply, and the other end is connected with optocoupler U1 the 4th pin and the 6th resistance R6.
Alternatively, the second electric capacity C2 is has an electrode capacitance, the second electric capacity C2 positive pole and the 6th resistance R6, the 7th resistance R7 and
Signal output part connects, the second electric capacity C2 negative pole ground connection.
Alternatively, signal output module includes：3rd electric capacity C3, the 3rd electric capacity C3 one end and optocoupler U1 the 3rd pin
Connected with signal output part, the other end is connected and is grounded with optocoupler U1 the 4th pin；8th resistance R8, the one of the 8th resistance R8
End is connected with signal output part, the positive pole VCC connections of the other end and out-put supply.
Technical scheme provided by the utility model, has the following advantages that：First resistor R1 one end connects with zero-power line N
Connect, the other end is connected with optocoupler U1 the first pin and the 5th resistance R5；Second resistance R2,3rd resistor R3 and the 4th resistance R4
One end be connected respectively with three-phase A, B and C of power firestreak, the other end and optocoupler U1 second pin and the 5th resistance R5 connect
Connect, thus, when open phases of three-phase power source or it is under-voltage when, voltage, optocoupler U1 conductings, signal output be present in the 5th resistance R5 both ends
Module exports detection signal, so as to realize that three-phase electric power open phase, under-voltage circuit integrating detect, circuit structure is simple.
In addition, the 5th resistance R5 is adjustable resistance, thus, when three phase mains is under-voltage, produced between the three-phase of three phase mains
During certain voltage difference, the voltage at the 5th resistance R5 both ends, control can be changed by the size for the resistance for adjusting the 5th resistance R5
Whether optocoupler U1 input turns under the voltage difference, so as to realize the tune of the detection threshold value to the under-voltage detection of three phase mains
Section.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of a kind of circuit diagram of three-phase power detection circuit disclosed in the present embodiment；
Fig. 2 is a kind of another circuit diagram of three-phase power detection circuit disclosed in the present embodiment.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
In the description of the invention, it is necessary to which explanation, term " first ", " second ", " the 3rd " etc. are only used for describing mesh
, and it is not intended that instruction or hint relative importance.
Embodiment 1
Present embodiment discloses a kind of three-phase power detection circuit, as shown in figure 1, including Power Entry Module, optocoupler U1
And signal output module, wherein, Power Entry Module includes：First resistor R1, first resistor R1 one end connect with zero-power line N
Connect, the other end is connected with optocoupler U1 the first pin and the 5th resistance R5；Second resistance R2,3rd resistor R3 and the 4th resistance
R4, second resistance R2,3rd resistor R3 and the 4th resistance R4 one end are connected with three-phase A, B and C of power firestreak respectively, another
End is connected with optocoupler U1 second pin and the 5th resistance R5；The of 5th resistance R5, the 5th resistance R5 one end and optocoupler U1
One pin is connected, and the other end is connected with optocoupler U1 second pin.In a particular embodiment, second resistance R2,3rd resistor R3
It is a resistance or multiple series resistances, specifically, second resistance R2,3rd resistor R3 and the 4th resistance with the 4th resistance R4
R4 resistance is preferably between 100k~1M, and first resistor R1 resistance is preferably between 0~100 Ω.
In the present embodiment, optocoupler U1 includes：First pin, the first pin are the positive pole of light emitting diode；Second pin,
Second pin is the negative pole of light emitting diode；3rd pin, the 3rd pin are the colelctor electrode of phototriode；4th pin, the
Four pins are the emitter stage of phototriode.Specifically, when three phase mains is normal, not phase shortage or it is under-voltage when, three phase mains
Voltage vector and be zero, voltage is not present in the 5th resistance R5 both ends, and optocoupler U1 input is not turned on, and thus, optocoupler U1's is defeated
Go out end to be not turned on, signal output normal level signal；When open phases of three-phase power source or it is under-voltage when, the voltage vector of three phase mains and
It is not zero, the 5th resistance R5 both ends have voltage, when the pressure difference between three-phase is increasing so that the electricity at the 5th resistance R5 both ends
Pressure is raised to when enough turning on optocoupler U1 input, optocoupler U1 input conducting, thus, lead optocoupler U1 output end
Lead to, signal output module output abnormality level signal, open phases of three-phase power source or undervoltage warning, so as to realize three-phase electric power open phase
Or under-voltage circuit integrating detection, circuit structure are simple.In the present embodiment, optocoupler U1 input refers to, optocoupler U1
The first pin, the light emitting diode between second pin and the first pin and second pin；Optocoupler U1 output end refers to
Phototriode between optocoupler U1 the 3rd pin, the 4th pin and the 3rd pin and the 4th pin.
In an alternate embodiment of the invention, the 5th resistance R5 in the Power Entry Module of the three-phase power detection circuit is adjustable
Resistance, can be by adjusting the 5th resistance R5 when three phase mains is under-voltage, and certain voltage difference is produced between the three-phase of three phase mains
Resistance size change the 5th resistance R5 both ends voltage, control optocoupler U1 whether turned under the voltage difference, so as to, realize
Regulation to the under-voltage detection threshold value of three phase mains, in the present embodiment, under-voltage detection threshold value refer to, a certain phase in three phase mains
Magnitude of voltage is less than or equal to the size of the threshold value, signal output module output abnormality signal.In a particular embodiment, the 5th resistance R5
Maximum can be selected to adjust 1M adjustable resistance, it is preferable that the 5th resistance R5 adjustable range is 3.3k to 200k.
In the present embodiment, when the 5th resistance R5 resistance increase, under identical voltage difference, the voltage at the 5th resistance R5 both ends subtracts
It is small, thus, optocoupler U1 input conducting required voltage difference increase, i.e., the threshold value of under-voltage detection improves, specifically, when the 5th
When resistance R5 resistance is 47K, the threshold value of under-voltage detection is 160V~170V, when the 5th resistance R5 resistance is 4.7k, is owed
The threshold value of pressure detection is 92V or so.It should be noted that above-mentioned concrete numerical value is only for ease of skilled artisan understands that this reality
The specific example applied the scheme of example and lifted, above-mentioned concrete numerical value are understood not to the limit formed to the present embodiment technical scheme
System.
In an alternate embodiment of the invention, the signal output module of the three-phase power detection circuit includes：Out-put supply, output electricity
The positive pole VCC and optocoupler U1 in source the 3rd pin are connected；6th resistance R6, the 6th resistance R6 one end are drawn with the 4th of optocoupler U1
Pin is connected, and the other end is connected with the 7th resistance R7, the second electric capacity C2 and signal output part；7th resistance R7 other end ground connection；
Second electric capacity C2 other end ground connection.In the present embodiment, when three phase mains is normal, optocoupler U1 output end is not turned on, the
One end no-voltage that six resistance R6 are connected with optocoupler U1 the 4th pin, the 7th resistance R7 both ends also no-voltage, thus, signal
Output end exports low level signal；When open phases of three-phase power source or it is under-voltage when, optocoupler U1 output end conducting, the 6th resistance R6 with
The voltage of one end of optocoupler U1 the 4th pin connection is lifted to the magnitude of voltage of out-put supply, then, the 6th resistance R6 and the 7th
Voltage, signal output part output high level signal be present in resistance R7 partial pressures, the 7th resistance R7 both ends.In a particular embodiment,
6th resistance R6 resistance is preferably between 4.7k~20K, and the 7th resistance R7 resistance is preferably between 47K~200K second
Electric capacity C2 capacitance is preferably between 10uF~68uf.
In the present embodiment, the second electric capacity C2 is used to filter, and the second electric capacity C2 is preferably to have electrode capacitance, the second electric capacity C2's
Positive pole is connected with the 6th resistance R6, the 7th resistance R7 and signal output part, the second electric capacity C2 negative pole ground connection, specifically, when the
Two electric capacity C2 is when having electrode capacitance, after three-phase electricity recovers normal, the second electric capacity C2 are without charge and discharge process repeatedly, signal output
The level signal of end output is reset to low level speed from high level.
In an alternate embodiment of the invention, the signal output module of the three-phase power detection circuit also includes the first electric capacity C1, the
One electric capacity C1 one end is connected with the positive pole VCC of optocoupler U1 the 3rd pin and out-put supply, the other end and the 4th of optocoupler U1
Pin and the 6th resistance R6 connections.In the present embodiment, the first electric capacity C1 is used to filter, meanwhile, when three phase mains from phase shortage or
When person's under-voltage condition recovers normal, the first electric capacity C1 can extend certain level signal resetting time, prevent because signal is answered
Position phase shortage that is too fast and not finding three phase mains or under-voltage exception.In a particular embodiment, the first electric capacity C1 capacitance is excellent
Elect as between 47nF~470nF.
In an alternate embodiment of the invention, as shown in Fig. 2 the signal output module of the three-phase power detection circuit includes：3rd
Electric capacity C3, the 3rd electric capacity C3 one end are connected with optocoupler U1 the 3rd pin and signal output part, and the of the other end and optocoupler U1
Four pins are connected and are grounded；8th resistance R8, the 8th resistance R8 one end are connected with signal output part, the other end and out-put supply
Positive pole VCC connections.In the present embodiment, when three phase mains is normal, optocoupler U1 output end is not turned on, the 8th resistance R8's
The voltage at both ends is the magnitude of voltage of out-put supply, thus, signal output part output size is the height of the magnitude of voltage of out-put supply
Level signal；When open phases of three-phase power source or it is under-voltage when, optocoupler U1 output end conducting, the voltage at the 8th resistance R8 both ends because
8th resistance R8 itself resistance and be pulled low, thus, signal output part output low level signal.In a particular embodiment,
Eight resistance R8 resistance is preferably between 4.7k~10K, and the 3rd electric capacity C3 capacitance is preferably between 47nF~470nF.
The technical scheme that the utility model embodiment provides, has the following advantages that：First resistor R1 one end and power supply zero
Line N connections, the other end are connected with optocoupler U1 the first pin and the 5th resistance R5；Second resistance R2,3rd resistor R3 and the 4th
Resistance R4 one end is connected with three-phase A, B and C of power firestreak respectively, the second pin and the 5th resistance of the other end and optocoupler U1
R5 connections, thus, when open phases of three-phase power source or it is under-voltage when, voltage, optocoupler U1 conductings, signal be present in the 5th resistance R5 both ends
Output module exports detection signal, so as to realize that three-phase electric power open phase, under-voltage circuit integrating detect, circuit structure is simple.
In addition, the 5th resistance R5 is adjustable resistance, thus, when three phase mains is under-voltage, produced between the three-phase of three phase mains
During certain voltage difference, the voltage at the 5th resistance R5 both ends, control can be changed by the size for the resistance for adjusting the 5th resistance R5
Whether optocoupler U1 input turns under the voltage difference, so as to realize the tune of the detection threshold value to the under-voltage detection of three phase mains
Section.
When the power supply detected is not three-phase alternating-current supply, similar to phase shortage or under-voltage detection, in above-described embodiment
Three-phase power detection circuit can also output abnormality level signal make warning, realize the detection to non-three phase mains.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among the protection domain that variation is created still in the utility model.
Claims (8)
1. a kind of three-phase power detection circuit, including Power Entry Module, optocoupler U1 and signal output module, it is characterised in that
The Power Entry Module includes：
First resistor R1, one end of the first resistor R1 are connected with zero-power line N, and the other end draws with the first of the optocoupler U1
Pin and the 5th resistance R5 connections；
Second resistance R2,3rd resistor R3 and the 4th resistance R4, the second resistance R2, the 3rd resistor R3 and the described 4th
Resistance R4 one end is connected with three-phase A, B and C of power firestreak respectively, the other end and the optocoupler U1 second pin and described
5th resistance R5 connections；
The 5th resistance R5, one end of the 5th resistance R5 are connected with first pin of the optocoupler U1, the other end
It is connected with the second pin of the optocoupler U1.
2. three-phase power detection circuit according to claim 1, it is characterised in that the 5th resistance R5 is adjustable electric
Resistance.
3. three-phase power detection circuit according to claim 1, it is characterised in that the second resistance R2, the described 3rd
Resistance R3 and the 4th resistance R4 is a resistance or multiple series resistances.
4. three-phase power detection circuit according to claim 1, it is characterised in that the optocoupler U1 includes：
First pin, first pin are the positive pole of light emitting diode；
The second pin, the second pin are the negative pole of the light emitting diode；
3rd pin, the 3rd pin are the colelctor electrode of phototriode；
4th pin, the 4th pin are the emitter stage of the phototriode.
5. three-phase power detection circuit according to claim 4, it is characterised in that the signal output module includes：
Out-put supply, the positive pole VCC of the out-put supply are connected with the 3rd pin of the optocoupler U1；
6th resistance R6, one end of the 6th resistance R6 are connected with the 4th pin of the optocoupler U1, the other end and
Seven resistance R7, the second electric capacity C2 connect with signal output part；
The other end ground connection of the 7th resistance R7；
The other end ground connection of the second electric capacity C2.
6. three-phase power detection circuit according to claim 5, it is characterised in that the signal output module also includes：
First electric capacity C1, one end of the first electric capacity C1 and the 3rd pin of the optocoupler U1 and the out-put supply
Positive pole VCC connections, the other end are connected with the 4th pin of the optocoupler U1 and the 6th resistance R6.
7. three-phase power detection circuit according to claim 5, it is characterised in that the second electric capacity C2 is extremely electric to have
Hold, the positive pole of the second electric capacity C2 is connected with the 6th resistance R6, the 7th resistance R7 and the signal output part, institute
State the second electric capacity C2 negative pole ground connection.
8. three-phase power detection circuit according to claim 4, it is characterised in that the signal output module includes：
3rd electric capacity C3, the 3rd electric capacity C3 one end connect with the 3rd pin and signal output part of the optocoupler U1
Connect, the other end is connected and is grounded with the 4th pin of the optocoupler U1；
8th resistance R8, one end of the 8th resistance R8 are connected with the signal output part, and the other end and out-put supply are just
Pole VCC connections.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720922174.2U CN206906560U (en) | 2017-07-27 | 2017-07-27 | A kind of three-phase power detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720922174.2U CN206906560U (en) | 2017-07-27 | 2017-07-27 | A kind of three-phase power detection circuit |
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| CN206906560U true CN206906560U (en) | 2018-01-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466735A (en) * | 2021-09-06 | 2021-10-01 | 西安热工研究院有限公司 | Variable power supply monitoring circuit |
| CN113612203A (en) * | 2021-08-06 | 2021-11-05 | 国网河北省电力有限公司检修分公司 | Device and method for protecting phase sequence relay of transformer |
-
2017
- 2017-07-27 CN CN201720922174.2U patent/CN206906560U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612203A (en) * | 2021-08-06 | 2021-11-05 | 国网河北省电力有限公司检修分公司 | Device and method for protecting phase sequence relay of transformer |
| CN113466735A (en) * | 2021-09-06 | 2021-10-01 | 西安热工研究院有限公司 | Variable power supply monitoring circuit |
| CN113466735B (en) * | 2021-09-06 | 2022-02-11 | 西安热工研究院有限公司 | Variable power supply monitoring circuit |
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