CN113376450A - Circuit for isolating and detecting phase loss function of three-phase voltage - Google Patents
Circuit for isolating and detecting phase loss function of three-phase voltage Download PDFInfo
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- CN113376450A CN113376450A CN202110704440.5A CN202110704440A CN113376450A CN 113376450 A CN113376450 A CN 113376450A CN 202110704440 A CN202110704440 A CN 202110704440A CN 113376450 A CN113376450 A CN 113376450A
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- 239000003990 capacitor Substances 0.000 claims description 15
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- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/16—Measuring asymmetry of polyphase networks
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Abstract
本发明公开了一种隔离检测三相电压缺相功能的电路，包括三相交流输入电源的输入相线L1、L2和L3；L1与二极管D1阳极相接；D1阴极与R1一端相接；R1另一端分别接D6、C1和R2；R2与光耦U1第1管脚相接；U1第2管脚分别接D6阳极、C1和D3；U1第4管脚与U2第3管脚相接；D3与L3相接；U2的第4管脚作为信号检测输出端V0与R5相接；R5另一端与直流电源DC相接；U2的第1管脚与R4相接；R4分别与C2、D5和R3相接；R3与二极管D2相接；D2与L2相接；U2的第2管脚分别与C2、D5和D4相接；D4阴极与L3相接。本发明能够通过较少的器件，可靠地实现对三相输入缺相的检测功能。
The invention discloses a circuit for isolating and detecting phase loss of three-phase voltage. The other end is connected to D6, C1 and R2 respectively; R2 is connected to the first pin of the optocoupler U1; the second pin of U1 is connected to the anode of D6, C1 and D3 respectively; the fourth pin of U1 is connected to the third pin of U2; D3 is connected to L3; the fourth pin of U2 is connected to R5 as a signal detection output terminal; the other end of R5 is connected to the DC power supply DC; the first pin of U2 is connected to R4; R4 is connected to C2, D5 respectively It is connected with R3; R3 is connected with diode D2; D2 is connected with L2; the second pin of U2 is connected with C2, D5 and D4 respectively; the cathode of D4 is connected with L3. The present invention can reliably realize the detection function of three-phase input phase loss through fewer devices.
Description
Technical Field
The invention relates to the technical field of circuit detection, in particular to a circuit for isolating and detecting a phase loss function of three-phase voltage.
Background
For the electric equipment using three-phase alternating current, a basic reliability protection function is a three-phase input open-phase detection function, when any phase voltage in three-phase input is open-phase, an open-phase alarm signal needs to be output through a circuit module, and therefore safety protection of the electric equipment is achieved through further processing of the alarm signal, such as driving of a fault indicator lamp, a fault relay and the like.
At present, in order to realize the function of detecting the three-phase input open-phase, the detection circuit adopted is a complex three-phase input open-phase detection analog circuit or is realized by using a sensor through complex circuit sampling and signal processing.
Referring to fig. 1, a conventional three-phase input open-phase detection analog circuit is shown, which is used for open-phase detection. When three-phase power input is normal, the optical coupler U7 outputs a low-level signal, and when a phase loss problem occurs, the secondary side output of the optical coupler is a high-level signal.
For the existing three-phase input open-phase detection analog circuit, more ID discrete devices are needed, for example, the circuit shown in fig. 1 needs: the circuit comprises 6 diodes, 4 optocouplers, 2 triodes, 4 operational amplifiers and 14 resistors. Therefore, the conventional three-phase input open-phase detection analog circuit not only has higher manufacturing cost because a plurality of discrete devices are used, but also influences the detection reliability of the whole circuit because of the dispersion of performance parameters of the discrete devices.
Referring to fig. 2, a conventional three-phase input open-phase detection analog-digital hybrid circuit is shown, which is used for open-phase detection. When three-phase power input is normal, the voltage of input L1-L2 and L2-L3 lines is isolated through voltage transformers TV1 and TV2, the voltage is converted into a direct-current voltage signal through a precise rectification detection circuit, the direct-current voltage signal enters an analog-to-digital converter of a microcontroller MCU, and finally the input alternating-current voltage signal is converted into a digital quantity signal in the MCU. When an L1 or L3 phase loss fault occurs, the sampling of the corresponding channel digital quantity will be 0, and when an L2 phase loss fault occurs, both channel digital quantities are 0, thereby judging the occurrence of the phase loss fault.
For the existing open-phase detection analog-digital hybrid circuit, the circuit is complex to realize, not only needs R1, R2, R3, R4, TV1, TV2 and a precise rectification detection circuit to form an analog sampling conditioning circuit, but also needs a digital circuit taking an MCU microcontroller as a core to perform analog quantity-to-digital quantity conversion, and judges whether open-phase exists or not in a program. The circuit is complicated, the cost is high, the digital circuit judges the phase failure, the problems of detection and judgment delay, program possibly run away and the like exist, and the reliability is not as high as that of the complete analog circuit.
Disclosure of Invention
The invention aims to provide a circuit for isolating and detecting a three-phase voltage open-phase function aiming at the technical defects in the prior art.
Therefore, the invention provides a circuit for isolating and detecting the open-phase function of three-phase voltage, which comprises input phase lines L1, L2 and L3 of a three-phase alternating-current input power supply;
wherein, an input phase line L1 of the three-phase AC input power supply is connected with the anode of the diode D1;
the cathode of the diode D1 is connected with one end of the resistor R1;
the other end of the resistor R1 is respectively connected with the cathode of the voltage stabilizing diode D6, one end of the capacitor C1 and one end of the resistor R2;
the other end of the resistor R2 is connected with the 1 st pin of the optocoupler U1;
the 2 nd pin of the optocoupler U1 is respectively connected with the anode of the voltage regulator diode D6, the other end of the capacitor C1 and the anode of the diode D3;
a 3 rd pin of the optical coupler U1 is grounded;
the 4 th pin of the optical coupler U1 is connected with the 3 rd pin of the optical coupler U2;
wherein, the cathode of the diode D3 is connected with the input phase line L3 of the three-phase AC input power supply;
the 4 th pin of the optocoupler U2 is used as a signal detection output end V0 and is connected with one end of a resistor R5;
the other end of the resistor R5 is connected with a direct current power supply DC;
the 1 st pin of the optocoupler U2 is connected with one end of the resistor R4;
the other end of the resistor R4 is respectively connected with one end of the capacitor C2, the cathode of the voltage stabilizing diode D5 and one end of the resistor R3;
the other end of the resistor R3 is connected with the cathode of the diode D2;
the anode of the diode D2 is connected with an input phase line L2 of a three-phase alternating-current input power supply;
the 2 nd pin of the optocoupler U2 is respectively connected with the other end of the capacitor C2, the anode of the voltage stabilizing diode D5 and the anode of the diode D4;
the cathode of the diode D4 is connected with the input phase line L3 of the three-phase AC input power supply.
Preferably, the DC power supply DC is a 12V DC power supply.
Preferably, the three-phase alternating current input power supply is a 380V rated alternating current input power supply.
Preferably, the isolation sampling is realized by using optical couplers U1 and U2.
Compared with the prior art, the circuit for isolating and detecting the open-phase function of the three-phase voltage is scientific in structural design, can reliably realize the function of detecting the open-phase of the three-phase input through fewer devices aiming at the problems of complex structure, more discrete devices and low reliability of the existing three-phase input open-phase detection analog circuit, and meanwhile avoids the defects of complex detection circuit and low reliability formed by using a voltage transformer, a microcontroller and the like, so that the circuit has great production practice significance.
For the invention, only 2 optocouplers, 6 diodes, 5 resistors and 2 capacitors are needed to creatively realize the phase-loss detection function.
The invention solves the problems of sampling and signal processing through a complex circuit in the existing three-phase input open-phase detection analog circuit, simplifies devices and improves reliability.
Drawings
Fig. 1 is a schematic diagram of a conventional three-phase input open-phase detection analog circuit;
fig. 2 is a schematic diagram of a conventional three-phase input open-phase detection analog-digital hybrid circuit;
fig. 3 is a schematic diagram of a circuit for isolating and detecting a phase loss function of a three-phase voltage provided by the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below with reference to embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, shall fall within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 3, the present invention provides a circuit for isolating and detecting a phase loss function of a three-phase voltage, which includes input phase lines L1, L2 and L3 (i.e. representing A, B and C phase lines, respectively) of a three-phase AC input power (e.g. an AC input power of 380V, or other rated three-phase AC power);
wherein, an input phase line L1 of the three-phase AC input power supply is connected with the anode of the diode D1;
the cathode of the diode D1 is connected with one end of the resistor R1;
the other end of the resistor R1 is respectively connected with the cathode of the voltage stabilizing diode D6, one end of the capacitor C1 and one end of the resistor R2;
the other end of the resistor R2 is connected with the 1 st pin of the optocoupler U1;
the 2 nd pin of the optocoupler U1 is respectively connected with the anode of the voltage regulator diode D6, the other end of the capacitor C1 and the anode of the diode D3;
a 3 rd pin of the optical coupler U1 is grounded;
the 4 th pin of the optical coupler U1 is connected with the 3 rd pin of the optical coupler U2;
wherein, the cathode of the diode D3 is connected with the input phase line L3 of the three-phase AC input power supply;
the 4 th pin of the optocoupler U2 is used as a signal detection output end V0 and is connected with one end of a resistor R5;
the other end of the resistor R5 is connected with a direct current power supply DC;
the 1 st pin of the optocoupler U2 is connected with one end of the resistor R4;
the other end of the resistor R4 is respectively connected with one end of the capacitor C2, the cathode of the voltage stabilizing diode D5 and one end of the resistor R3;
the other end of the resistor R3 is connected with the cathode of the diode D2;
the anode of the diode D2 is connected with an input phase line L2 of a three-phase alternating-current input power supply;
the 2 nd pin of the optocoupler U2 is respectively connected with the other end of the capacitor C2, the anode of the voltage stabilizing diode D5 and the anode of the diode D4;
the cathode of the diode D4 is connected with the input phase line L3 of the three-phase AC input power supply.
In the present invention, the DC power supply DC is a 12V DC power supply.
In the invention, in particular, the optical couplers U1 and U2 are adopted to realize isolated sampling.
In particular, it should be noted that the optocouplers U1 and U2 are common optocouplers, such as TLP521 and TLP621 manufactured by toshiba, uk high-count light, friend station semiconductor, and the like, or 817 series optocouplers manufactured by ansenmei, hundred million light, photonic and the like, and the optocouplers are not limited to the optocouplers of the above companies and types and can be applied to the present technical solution. The optical coupler mainly plays a role in isolation, so that no special requirements are made on manufacturers and models.
For opto-couplers U1 and U2, the 1 st pin that it has is the inside emitting diode positive pole of opto-coupler, and the 2 nd pin of opto-coupler is the inside emitting diode negative pole of opto-coupler, and the 3 rd pin of opto-coupler is the projecting pole of the inside phototriode of opto-coupler, and the 4 th pin of opto-coupler is the collecting electrode of the inside phototriode of opto-coupler.
In the invention, it should be noted that, for the signal detection output terminal V0, when a phase-lacking fault occurs, the output of the terminal V0 is a high level, which can be used to drive the relay coil and provide an alarm contact to the outside; the fault indicator lamp, the buzzer and the like can be driven to provide acousto-optic alarm (because the high level can meet the working voltage of the fault indicator lamp or the buzzer, the acousto-optic alarm is realized, and the low level cannot meet the working voltage); other circuits can also be put into a protection state by using high level; the phase-lack fault detection circuit can also be applied to a singlechip and the like for collecting the high and low levels of the V0 position to judge the phase-lack fault and indirectly control other circuits. Different circuits can be adapted according to the needs of specific scenes. Of course, other ways can be adopted to collect the level state of the V0 terminal.
In order to more clearly understand the technical solution of the present invention, the following describes the working principle of the present invention.
For the circuit provided by the invention, L1, L2 and L3 are three-phase input phase lines of a three-phase alternating current input power supply (for example, 380V alternating current AC input power supply), respectively, and V0 is an isolated level signal, and whether the phase is open is detected by acquiring the level of V0. The specific situation is as follows:
an input phase line L1 is subjected to half-wave rectification with an input phase line L3 through D1, R1, C1 and D3, an input phase line L2 is subjected to half-wave rectification with an input phase line L3 through D2, R3, D5 and D4, wherein R1 and R3 are voltage reduction resistors, and D6 and D5 are voltage stabilizing diodes; c1 and C2 are filter capacitors and are connected between D5 and D6 in parallel, so that a stable stabilized power supply is obtained; r2 and R4 are current-limiting resistors, voltages of C1 and C2 are limited by R2 and R4 and then are added to the optical couplers U1 and U2, secondary phases of U1 and U2 are conducted, the voltage of the signal detection output end V0 is pulled down, and the signal detection output end V0 outputs low level, which indicates that three phases are normal.
When the input phase line L1 is absent, no loop exists from L1 to L3, no voltage exists on C1, U1 is not conducted, and V0 outputs high level, so that the voltage provided by the input phase line L1 is indicated to indicate that the phase is absent (namely, the phase is absent).
And when the input phase line L2 is absent, no loop exists from L2 to L3, no voltage exists on C2, U2 is not conducted, and V0 outputs high level, so that the voltage provided by the input phase line L2 is indicated to be absent (namely, the absent phase is reported).
And when the L3 is absent, no loop exists from L1L2 to L3, no voltage exists in C1C2, no conduction exists in U1U2, and the V0 outputs a high level, so that the voltage provided by the input phase line L3 is indicated to be absent (namely, the absent phase is reported).
In summary, compared with the prior art, the circuit for isolating and detecting the phase loss function of the three-phase voltage provided by the invention has scientific structural design, can reliably realize the detection function of the phase loss of the three-phase input through fewer devices aiming at the problems of complex structure, more discrete devices and low reliability of the existing analog circuit for detecting the phase loss of the three-phase input, and simultaneously avoids the defects of complex detection circuit and low reliability formed by using a voltage transformer, a microcontroller and the like, thereby having great production practice significance.
For the invention, only 2 optocouplers, 6 diodes, 5 resistors and 2 capacitors are needed to creatively realize the phase-loss detection function.
The invention solves the problems of sampling and signal processing through a complex circuit in the existing three-phase input open-phase detection analog circuit, simplifies devices and improves reliability.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A circuit for detecting the open-phase function of three-phase voltage in an isolation way is characterized by comprising input phase lines L1, L2 and L3 of a three-phase alternating-current input power supply;
wherein, an input phase line L1 of the three-phase AC input power supply is connected with the anode of the diode D1;
the cathode of the diode D1 is connected with one end of the resistor R1;
the other end of the resistor R1 is respectively connected with the cathode of the voltage stabilizing diode D6, one end of the capacitor C1 and one end of the resistor R2;
the other end of the resistor R2 is connected with the 1 st pin of the optocoupler U1;
the 2 nd pin of the optocoupler U1 is respectively connected with the anode of the voltage regulator diode D6, the other end of the capacitor C1 and the anode of the diode D3;
a 3 rd pin of the optical coupler U1 is grounded;
the 4 th pin of the optical coupler U1 is connected with the 3 rd pin of the optical coupler U2;
wherein, the cathode of the diode D3 is connected with the input phase line L3 of the three-phase AC input power supply;
the 4 th pin of the optocoupler U2 is used as a signal detection output end V0 and is connected with one end of a resistor R5;
the other end of the resistor R5 is connected with a direct current power supply DC;
the 1 st pin of the optocoupler U2 is connected with one end of the resistor R4;
the other end of the resistor R4 is respectively connected with one end of the capacitor C2, the cathode of the voltage stabilizing diode D5 and one end of the resistor R3;
the other end of the resistor R3 is connected with the cathode of the diode D2;
the anode of the diode D2 is connected with an input phase line L2 of a three-phase alternating-current input power supply;
the 2 nd pin of the optocoupler U2 is respectively connected with the other end of the capacitor C2, the anode of the voltage stabilizing diode D5 and the anode of the diode D4;
the cathode of the diode D4 is connected with the input phase line L3 of the three-phase AC input power supply.
2. The circuit for isolating and detecting the open-phase function of three-phase voltage according to claim 1, wherein the DC power supply DC is a 12V DC power supply.
3. The circuit for isolating and detecting the open-phase function of three-phase voltage according to claim 1, wherein the three-phase AC input power supply is 380V rated AC input power supply.
4. The circuit for detecting the open-phase function of the three-phase voltage in an isolating way as claimed in claim 1, is characterized in that the isolating sampling is realized by adopting optocouplers U1 and U2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110704440.5A CN113376450A (en) | 2021-06-24 | 2021-06-24 | Circuit for isolating and detecting phase loss function of three-phase voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110704440.5A CN113376450A (en) | 2021-06-24 | 2021-06-24 | Circuit for isolating and detecting phase loss function of three-phase voltage |
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| CN113376450A true CN113376450A (en) | 2021-09-10 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413975A (en) * | 2007-10-16 | 2009-04-22 | 深圳市汇川技术股份有限公司 | Three-phase power input phase lack detection circuit |
| CN102183704A (en) * | 2011-02-23 | 2011-09-14 | 广州邦讯信息系统有限公司 | An antitheft sensor for a transformer |
| CN202217019U (en) * | 2011-09-15 | 2012-05-09 | 广州三晶电气有限公司 | Three-phase power input phase loss detection circuit |
| CN217305332U (en) * | 2021-06-24 | 2022-08-26 | 天津铁路信号有限责任公司 | Circuit for isolating and detecting phase loss function of three-phase voltage |
-
2021
- 2021-06-24 CN CN202110704440.5A patent/CN113376450A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413975A (en) * | 2007-10-16 | 2009-04-22 | 深圳市汇川技术股份有限公司 | Three-phase power input phase lack detection circuit |
| CN102183704A (en) * | 2011-02-23 | 2011-09-14 | 广州邦讯信息系统有限公司 | An antitheft sensor for a transformer |
| CN202217019U (en) * | 2011-09-15 | 2012-05-09 | 广州三晶电气有限公司 | Three-phase power input phase loss detection circuit |
| CN217305332U (en) * | 2021-06-24 | 2022-08-26 | 天津铁路信号有限责任公司 | Circuit for isolating and detecting phase loss function of three-phase voltage |
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