CN107345989A - A kind of three-phase input power phase shortage detects circuit - Google Patents
A kind of three-phase input power phase shortage detects circuit Download PDFInfo
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- CN107345989A CN107345989A CN201710656273.5A CN201710656273A CN107345989A CN 107345989 A CN107345989 A CN 107345989A CN 201710656273 A CN201710656273 A CN 201710656273A CN 107345989 A CN107345989 A CN 107345989A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
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Abstract
The present invention provides a kind of three-phase input power phase shortage detection circuit, including signaling conversion circuit, latching circuit and output circuit, signaling conversion circuit are used to three phase mains input voltage being converted to level signal；Latching circuit is used for high level signal is locked；Output circuit is used for outputs level signals；The input connection three phase mains of signaling conversion circuit, its output end connection latching circuit input, the input of the output end connection output circuit of the latching circuit.When three-phase voltage input is normal, output circuit exports low level；If power down or phase shortage occur for any one phase voltage in the three-phase voltage of outside three-phase alternating current, output circuit persistently exports high level and locked, and whether power phase shortage is detected by the outputs level signals for observing output circuit.Circuit of the present invention is simple, detection is quick, accurately and reliably, strong antijamming capability, there is good application prospect.
Description
Technical field
The present invention relates to electric circuit inspection field, and in particular to a kind of lack detection circuit of three-phase input power supply.
Background technology
Because power network self reason or power input wiring are unreliable, Switching Power Supply is it sometimes appear that the feelings of phase-deficient operation
Condition, and phase-deficient operation is not easy to be found.When power supply is in phase-deficient operation, a certain arm no current of rectifier bridge, and other arms can be because
Serious excessively stream and damage, while it is abnormal inverter work occur, it is therefore necessary to which phase shortage is protected.
Power network phase shortage generally use current transformer or electronics lack detection circuit are detected, due to current transformer cost
Height, volume are big, therefore typically use electronics open-phase protection circuit in Switching Power Supply.And in general electronics open-phase protection circuit is more multiple
It is miscellaneous, need other devices to be used cooperatively, cost is higher, and reliability is not high.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of pile defection of three-phase input power supply electricity
Road, the circuit structure is simple, detection is quick, accurately and reliably, strong antijamming capability.
To achieve the above object, the present invention provides a kind of lack detection circuit of three-phase input power supply, including signal conversion
Circuit 1, latching circuit 2 and output circuit 3, the signaling conversion circuit 1 are used to three phase mains input voltage being converted to electricity
Ordinary mail number；The latching circuit 2 is used for high level signal is locked；The output circuit 3 is used for outputs level signals；The letter
The input connection three phase mains of number change-over circuit 1, its output end connection input of latching circuit 2, the latching circuit 2 it is defeated
Go out end connection output circuit 3 input, the output circuit 3 include optocoupler V4, diode D5, electric capacity C5 and resistance R18,
R19, described resistance R18 one end connect 12 supply voltages, its other end connection optocoupler V4 anode；Optocoupler V4 colelctor electrode connection
5V supply voltages, its emitter stage are grounded through electric capacity C5；Resistance R19 is parallel to electric capacity C5 both ends；Diode D5 negative electrodes connect optocoupler
V4 negative electrodes, its anode connect the output end of latching circuit 2.
Specifically, the signaling conversion circuit 1 includes branch road A, B and C, and the branch road A includes optocoupler V1, diode
D1 and operational amplifier U4, resistance R1 one end connect the A phases of three phase mains, sun of its other end through resistance R4 connection optocouplers V1
Pole, optocoupler V1 colelctor electrode concatenation operation amplifier U4 in-phase input ends；The negative electrode of the diode D1 anodes connection optocoupler V1,
Its negative electrode connection optocoupler V1 anode；The branch road B includes optocoupler V2, diode D2 and operational amplifier U3, resistance R2 mono-
End connection power supply B phase voltages, anode of its other end through resistance R5 connection optocouplers V2, optocoupler V2 colelctor electrode concatenation operation amplification
Device U2 in-phase input ends；The negative electrode of the diode D2 anodes connection optocoupler V2, its negative electrode connection optocoupler V2 anode；The branch
Road C includes optocoupler V3, diode D3 and operational amplifier U3, and resistance R3 one end connection power supply C phase voltages, its other end is through electricity
Hinder R6 connection optocouplers V3 anode, optocoupler V3 colelctor electrode concatenation operation amplifier U3 in-phase input ends；The diode D3 sun
Pole connection optocoupler V3 negative electrode, its negative electrode connection optocoupler V3 anode；Optocoupler V1, V2, V3 negative electrode are connected, and resistance R7 one end connects
12V supply voltages are connect, its other end connection optocoupler V1 colelctor electrode；Resistance R8 one end connects 12V supply voltages, and its other end connects
Connect optocoupler V2 colelctor electrode；Resistance R9 one end connects 12V supply voltages, its other end connection optocoupler V3 colelctor electrode；Resistance R10
One end connects 12V supply voltages, and its other end is grounded through resistance R11, and electric capacity C1 is parallel to resistance R11 both ends；The computing is put
Big node of device U4, U2, U3 inverting input between resistance R10, R11 is connected；Resistance R12 one end connection 12V power supply electricity
Pressure, its other end are grounded through electric capacity C2；Operational amplifier U4, U2, U3 output end is between resistance R12, electric capacity C2
Node is connected；The output end connection input of latching circuit 2 of the operational amplifier U4.
Specifically, the latching circuit 2 include triode Q1, operational amplifier U1, diode D4 and electric capacity C3,
C4, described triode Q1 base stages concatenation operation amplifier U4, U2, U3 output end, its colelctor electrode is through R13 connection 12V power supplys electricity
Pressure, its grounded emitter；The inverting input connecting triode Q1 of operational amplifier U1 colelctor electrode, its in-phase input end
It is grounded through resistance R15 connection 12V supply voltages, through resistance R16；Electric capacity C3 one end concatenation operation amplifier U1 just powers
End, its other end ground connection；Electric capacity C4 is parallel to electric capacity C3 both ends；Resistance R14 one end concatenation operation amplifier U1 inverting inputs,
Its other end is grounded；Resistance R17 one end connects 12V supply voltages, its other end concatenation operation amplifier U1 output end；Two poles
Pipe D4 anode concatenation operation amplifiers U1 output end, its negative electrode concatenation operation amplifier U1 in-phase input end；Operation amplifier
Device U1 output end connection diode D5 anode.
From above technical scheme, the invention provides a kind of lack detection circuit of three-phase input power supply, including letter
Number change-over circuit, latching circuit and output circuit, the input connection three phase mains of signaling conversion circuit, the connection of its output end
Latching circuit input, the input of the output end connection output circuit of latching circuit；The circuit structure is simple, examine it is quick,
Accurately, strong antijamming capability, stability are higher.
Brief description of the drawings
Fig. 1 is the schematic diagram of the lack detection circuit of three-phase input power supply of the present invention.
Triode Q1 base voltage waveform figure when Fig. 2 is the lack detection circuit phase shortage of three-phase input power supply of the present invention.
Embodiment
With reference to accompanying drawing, the present invention will be further described：
Embodiments of the invention as shown in Figure 1, a kind of lack detection circuit of three-phase input power supply, including signaling conversion circuit
1st, latching circuit 2 and output circuit 3, signaling conversion circuit 1 are used to three phase mains input voltage being converted to level signal；From
Lock circuit 2 is used for high level signal is locked；Output circuit 3 is used for outputs level signals；The input of signaling conversion circuit 1 connects
Three phase mains is connect, its output end connection input of latching circuit 2, the input of the output end connection output circuit 3 of latching circuit 2
End, output circuit 3 include optocoupler V4, voltage-regulator diode D5, electric capacity C5 and resistance R18, R19, the electricity of resistance R18 one end connection 12
Source voltage, its other end connection optocoupler V4 anode；Optocoupler V4 colelctor electrode connection 5V supply voltages, its emitter stage is through electric capacity C5
Ground connection；Resistance R19 is parallel to electric capacity C5 both ends；Voltage-regulator diode D5 negative electrodes connect optocoupler V4 negative electrodes, its anode connection self-locking electricity
The output end on road 2.
Signaling conversion circuit 1 includes branch road A, B and C, and branch road A includes optocoupler V1, diode D1 and operational amplifier
U4, resistance R1 one end connect the A phases of three phase mains, anode of its other end through resistance R4 connection optocouplers V1, optocoupler V1 current collection
Pole concatenation operation amplifier U4 in-phase input ends；Diode D1 anodes connection optocoupler V1 negative electrode, its negative electrode connection optocoupler V1's
Anode；Branch road B includes optocoupler V2, diode D2 and operational amplifier U3, and resistance R2 one end connection power supply B phase voltages, its is another
Anode of the one end through resistance R5 connection optocouplers V2, optocoupler V2 colelctor electrode concatenation operation amplifier U2 in-phase input ends；Diode
D2 anodes connection optocoupler V2 negative electrode, its negative electrode connection optocoupler V2 anode；Branch road C includes optocoupler V3, diode D3 and fortune
Calculate amplifier U3, resistance R3 one end connection power supply C phase voltages, anode of its other end through resistance R6 connection optocouplers V3, optocoupler V3
Colelctor electrode concatenation operation amplifier U3 in-phase input ends；Diode D3 anodes connection optocoupler V3 negative electrode, its negative electrode connection light
Coupling V3 anode；Optocoupler V1, V2, V3 negative electrode are connected, resistance R7 one end connection 12V supply voltages, its other end connection optocoupler
V1 colelctor electrode；Resistance R8 one end connects 12V supply voltages, its other end connection optocoupler V2 colelctor electrode；Resistance R9 one end connects
12V supply voltages are connect, its other end connection optocoupler V3 colelctor electrode；Resistance R10 one end connects 12V supply voltages, its other end
It is grounded through resistance R11, electric capacity C1 is parallel to resistance R11 both ends；Operational amplifier U4, U2, U3 inverting input are and resistance
Node between R10, R11 is connected；Resistance R12 one end connects 12V supply voltages, and its other end is grounded through electric capacity C2；Computing is put
Big node of device U4, U2, U3 output end between resistance R12, electric capacity C2 is connected；Operational amplifier U4 output end connection is certainly
The input of lock circuit 2.Optocoupler V1, V2, V3 in three branch roads, three-phase mains high voltage and power supply signal can be isolated, it is ensured that
Circuit safety, moreover it is possible to improve the antijamming capability of circuit.
Latching circuit 2 includes triode Q1, operational amplifier U1, diode D4 and electric capacity C3, C4, triode Q1 base stages
Concatenation operation amplifier U4, U2, U3 output end, its colelctor electrode is through R13 connection 12V supply voltages, its grounded emitter；Computing
Amplifier U1 inverting input connecting triode Q1 colelctor electrode, its in-phase input end is through resistance R15 connection 12V power supplys electricity
Press, be grounded through resistance R16；The positive feeder ears of electric capacity C3 one end concatenation operation amplifier U1, its other end ground connection；Electric capacity C4 is parallel to
Electric capacity C3 both ends；Resistance R14 one end concatenation operation amplifier U1 inverting inputs, its other end ground connection；Resistance R17 one end connects
12V supply voltages, its other end concatenation operation amplifier U1 output end；Diode D4 anode concatenation operation amplifiers U1's is defeated
Go out end, its negative electrode concatenation operation amplifier U1 in-phase input end；Operational amplifier U1 output end connection voltage-regulator diode D5
Anode.
The operation principle of the present embodiment is as follows：
When outside three-phase alternating current is normal, optocoupler V1, optocoupler V1 and optocoupler V1 are turned in turn, and triode Q1 base stage is always
Low level, triode Q1 are not turned on, and operational amplifier U1 output end is low level, and now voltage-regulator diode D5 plays voltage stabilizing and made
With optocoupler V4 conductings, its emitter stage is that alarm signal PH_FAULT is low level.
Power down or phase shortage, triode Q1 base voltage occur for any phase voltage in the three-phase voltage of outside three-phase alternating current
Oscillogram, as shown in Figure 2.Assuming that when lacking C phases, line voltage only has U AB, work as U ABIn near zero-crossing point, three optocouplers are not led
Logical, now triode Q1 base stages are high level, and transistor collector and emitter stage turn on, operational amplifier U1 inverting input
For low level, operational amplifier U1 output end is high level, and locked by diode D4, causes its output end persistently to export
High level, after so as to which locked alarm signal PH_FAULT be high level, powering off, fixing a breakdown, re-power, circuit is normal, transports
Amplifier U1 output low levels are calculated, alarm signal PH_FAULT reverts to low level.
By observing alarm signal PH_FAULT level signal, whether three-phase input power phase shortage can be accurately detected.
Circuit is detected by the three-phase input power phase shortage of the present embodiment, can accurately and timely detect open phases of three-phase power source
Whether.Compared in general electronics open-phase protection circuit, the circuit structure in the present embodiment is simple, cheap, without other dresses
Put, calculated without software, and with the advantages of detection is quick, result is accurate, reliability is high, strong antijamming capability, have very
Good application prospect.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made, it all should fall into the protection domain of claims of the present invention determination.
Claims (3)
1. a kind of three-phase input power phase shortage detects circuit, it is characterised in that：Including signaling conversion circuit (1), latching circuit (2)
And output circuit (3), the signaling conversion circuit (1) are used to three phase mains input voltage being converted to level signal；It is described
Latching circuit (2) is used for high level signal is locked；The output circuit (3) is used for outputs level signals；The signal conversion
The input connection three phase mains of circuit (1), the input of its output end connection latching circuit (2), the latching circuit（2）'s
Output end connects output circuit（3）Input, the output circuit（3）Including optocoupler V4, diode D5, electric capacity C5 and electricity
R18, R19 are hindered, described resistance R18 one end connects 12 supply voltages, its other end connection optocoupler V4 anode；Optocoupler V4 current collection
Pole connects 5V supply voltages, and its emitter stage is grounded through electric capacity C5；Resistance R19 is parallel to electric capacity C5 both ends；Diode D5 negative electrodes connect
Optocoupler V4 negative electrode is connect, its anode connection latching circuit（2）Output end.
2. three-phase input power phase shortage according to claim 1 detects circuit, it is characterised in that：The signaling conversion circuit
（1）Including branch road A, B and C, the branch road A includes optocoupler V1, diode D1 and operational amplifier U4, and resistance R1 one end connects
Connect the A phases of three phase mains, anode of its other end through resistance R4 connection optocouplers V1, optocoupler V1 colelctor electrode concatenation operation amplifier
U4 in-phase input ends；The negative electrode of the diode D1 anodes connection optocoupler V1, its negative electrode connection optocoupler V1 anode；The branch road
B includes optocoupler V2, diode D2 and operational amplifier U3, and resistance R2 one end connection power supply B phase voltages, its other end is through resistance
R5 connection optocouplers V2 anode, optocoupler V2 colelctor electrode concatenation operation amplifier U2 in-phase input ends；The diode D2 anodes
Connect optocoupler V2 negative electrode, its negative electrode connection optocoupler V2 anode；The branch road C includes optocoupler V3, diode D3 and computing
Amplifier U3, resistance R3 one end connection power supply C phase voltages, anode of its other end through resistance R6 connection optocouplers V3, optocoupler V3's
Colelctor electrode concatenation operation amplifier U3 in-phase input ends；The negative electrode of the diode D3 anodes connection optocoupler V3, the connection of its negative electrode
Optocoupler V3 anode；Optocoupler V1, V2, V3 negative electrode are connected, resistance R7 one end connection 12V supply voltages, its other end connection light
Coupling V1 colelctor electrode；Resistance R8 one end connects 12V supply voltages, its other end connection optocoupler V2 colelctor electrode；Resistance R9 one end
Connect 12V supply voltages, its other end connection optocoupler V3 colelctor electrode；Resistance R10 one end connects 12V supply voltages, and its is another
End is grounded through resistance R11, and electric capacity C1 is parallel to resistance R11 both ends；Operational amplifier U4, U2, U3 inverting input with
Node between resistance R10, R11 is connected；Resistance R12 one end connects 12V supply voltages, and its other end is grounded through electric capacity C2；Institute
Node of operational amplifier U4, U2, U3 output end between resistance R12, electric capacity C2 is stated to be connected；The operational amplifier
U4, U2, U3 output end are all connected with latching circuit（2）Input.
3. three-phase input power phase shortage according to claim 1 detects circuit, it is characterised in that：The latching circuit（2）
Including triode Q1, operational amplifier U1, diode D4 and electric capacity C3, C4, the triode Q1 base stages concatenation operation amplification
Device U4, U2, U3 output end, its colelctor electrode is through R13 connection 12V supply voltages, its grounded emitter；The operational amplifier U1
Inverting input connecting triode Q1 colelctor electrode, its in-phase input end through resistance R15 connection 12V supply voltages, through resistance
R16 is grounded；The positive feeder ears of electric capacity C3 one end concatenation operation amplifier U1, its other end ground connection；Electric capacity C4 is parallel to electric capacity
C3 both ends；Resistance R14 one end concatenation operation amplifier U1 inverting inputs, its other end ground connection；Resistance R17 one end connects 12V
Supply voltage, its other end concatenation operation amplifier U1 output end；Diode D4 anode concatenation operation amplifiers U1 output
End, its negative electrode concatenation operation amplifier U1 in-phase input end；Operational amplifier U1 output end connection diode D5 anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710656273.5A CN107345989B (en) | 2017-08-03 | 2017-08-03 | Open-phase detection circuit of three-phase input power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710656273.5A CN107345989B (en) | 2017-08-03 | 2017-08-03 | Open-phase detection circuit of three-phase input power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107345989A true CN107345989A (en) | 2017-11-14 |
| CN107345989B CN107345989B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710656273.5A Active CN107345989B (en) | 2017-08-03 | 2017-08-03 | Open-phase detection circuit of three-phase input power supply |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2595041Y (en) * | 2003-01-15 | 2003-12-24 | 尹修平 | Intelligent protector of motor |
| WO2013044602A1 (en) * | 2011-09-30 | 2013-04-04 | 海信科龙电器股份有限公司 | Zero-crossing signal detection circuit |
| CN203982473U (en) * | 2014-08-01 | 2014-12-03 | 重庆宁来科贸有限公司 | Arrangements for automotive doors drops into a kind of locking device of conversion automatically |
| CN205450126U (en) * | 2015-12-30 | 2016-08-10 | 天津诚电科技有限公司 | Three -phase power input open -phase detection circuit |
| CN207557357U (en) * | 2017-08-03 | 2018-06-29 | 合肥华耀电子工业有限公司 | A kind of three-phase input power phase shortage detection circuit |
-
2017
- 2017-08-03 CN CN201710656273.5A patent/CN107345989B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2595041Y (en) * | 2003-01-15 | 2003-12-24 | 尹修平 | Intelligent protector of motor |
| WO2013044602A1 (en) * | 2011-09-30 | 2013-04-04 | 海信科龙电器股份有限公司 | Zero-crossing signal detection circuit |
| CN203982473U (en) * | 2014-08-01 | 2014-12-03 | 重庆宁来科贸有限公司 | Arrangements for automotive doors drops into a kind of locking device of conversion automatically |
| CN205450126U (en) * | 2015-12-30 | 2016-08-10 | 天津诚电科技有限公司 | Three -phase power input open -phase detection circuit |
| CN207557357U (en) * | 2017-08-03 | 2018-06-29 | 合肥华耀电子工业有限公司 | A kind of three-phase input power phase shortage detection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 付燕星;杨年法;盛占石;姜庆旺;: "三相交流电源过零点及相序检测电路设计" * |
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| Publication number | Publication date |
|---|---|
| CN107345989B (en) | 2023-05-23 |
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