CN217305332U - 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
- Publication number
- CN217305332U CN217305332U CN202121413312.7U CN202121413312U CN217305332U CN 217305332 U CN217305332 U CN 217305332U CN 202121413312 U CN202121413312 U CN 202121413312U CN 217305332 U CN217305332 U CN 217305332U
- Authority
- CN
- China
- Prior art keywords
- phase
- pin
- diode
- input
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a circuit for isolating and detecting the phase loss function of three-phase voltage, which comprises input phase lines L1, L2 and L3 of a three-phase AC input power supply; l1 is connected with the anode of a diode D1; the cathode of the D1 is connected with one end of the R1; the other end of R1 is connected with D6, C1 and R2 respectively; the R2 is connected with the 1 st pin of the optocoupler U1; the 2 nd pin of U1 is connected with D6 anode, C1 and D3 respectively; the 4 th pin of U1 is connected with the 3 rd pin of U2; d3 is connected with L3; the 4 th pin of U2 is connected with R5 as a signal detection output end V0; the other end of the R5 is connected with a DC power supply DC; the 1 st pin of U2 is connected with R4; r4 is respectively connected with C2, D5 and R3; r3 is connected with a diode D2; d2 is connected with L2; the 2 nd pin of U2 is connected with C2, D5 and D4 respectively; the D4 cathode was connected to L3. The utility model discloses can realize the detection function that lacks the looks to three-phase input reliably through less device.
Description
Technical Field
The utility model relates to a circuit detection technical field especially relates to a keep apart circuit that detects three-phase voltage phase loss function.
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 one-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 usually adopted is a more 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 optocoupler U7 outputs a low level signal, and when the phase failure problem occurs, the secondary side output of the optocoupler outputs 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 existing three-phase input open-phase detection analog circuit not only has higher manufacturing cost because more discrete devices are used, but also influences the detection reliability of the whole circuit because of the discreteness 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 input line voltages of L1-L2 and L2-L3 are isolated through voltage transformers TV1 and TV2, converted into direct-current voltage signals through a precise rectification detection circuit, and then enter an analog-to-digital converter of a microcontroller MCU, and finally the input alternating-current voltage signals are converted into digital quantity signals 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 the channel digital quantities are 0, thereby judging the occurrence of the loss of phase 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 higher, the digital circuit judges the phase failure, there are problems such as detecting and judging time delay, program may have run-off, etc., the reliability is not as high as the complete analog circuit.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an keep apart circuit that detects three-phase voltage phase loss function to the technical defect that prior art exists.
Therefore, the utility model provides a circuit for isolating and detecting the phase-lack function of three-phase voltage, which comprises an input phase line L1, an input phase line L2 and an input phase line 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 optical couplers U1 and U2 are used for realizing isolated sampling.
By the above the technical scheme provided by the utility model it is visible, compare with prior art, the utility model provides an keep apart circuit that detects three-phase voltage and lack looks function, its structural design science, to current three-phase input lack looks detection analog circuit exist the structure complicated, the discrete device that exists is many and the problem that the reliability is low, can pass through less device, realize reliably lacking the detection function of looks to three-phase input, also avoided using voltage transformer simultaneously, the detection circuitry that constitutes such as microcontroller is complicated, the shortcoming that the reliability is not high has great production practice meaning.
To the utility model discloses, only need use 2 opto-couplers, 6 diodes, 5 resistance, 2 electric capacity, can creatively realize lacking the detection function of looks.
The utility model discloses, solved the current three-phase input and lacked the problem that the phase detection analog circuit exists carries out sampling and signal processing through the circuit of complicacy, simplified the device, improved the 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 utility model.
Detailed Description
The technical solution of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 3, the present invention provides a circuit for detecting open-phase function of three-phase voltage in an isolated manner, 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 a three-phase AC power of other rated values);
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 a voltage regulator diode D6, the other end of the capacitor C1 and the anode of a 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.
The utility model discloses in, in the concrete realization, direct current power supply DC is 12V's direct current power supply.
The utility model discloses in, on specifically realizing, adopt opto-coupler U1 and U2 to realize keeping apart the 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 manufacturers such as asem, hundred million light, and photonic, and are not limited to the optocouplers of the above companies and types, and can be applied to the technical solution. The opto-coupler is in the utility model discloses well main effect of keeping apart that plays consequently does not have special requirement to producer and model.
To opto-coupler U1 and U2, the 1 st pin that it had 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 present invention, it should be noted that, for the signal detection output terminal V0, when the open-phase fault occurs, the output of the V0 terminal 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 understand the technical solution of the present invention more clearly, the working principle of the present invention is explained below.
To the utility model provides a circuit, L1, L2 and L3 are the three-phase input phase line of three-phase AC input power supply (for example 380V's AC input power supply) respectively, and V0 is the level signal after the isolation, detects whether lack of phase through the level of gathering V0. The concrete conditions are 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 in parallel between D5 and D6, so that a stable stabilized power supply is obtained; the R2 and the R4 are current-limiting resistors, the voltages of the C1 and the C2 are added to the optical couplers U1 and U2 after being limited by the current of the R2 and the current of the R4, the secondary poles of the U1 and the secondary poles of the 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 the 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 in an open phase (namely, the open 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).
To sum up, compare with prior art, the utility model provides a pair of keep apart circuit that detects three-phase voltage and lack looks function, its structural design science, to current three-phase input lack looks detect the structure that analog circuit exists complicated, the discrete device of existence is many and the reliability is low problem, can realize the detection function to three-phase input lack looks reliably through less device, the detection circuitry who has also avoided using voltage transformer, microcontroller etc. to constitute simultaneously is complicated, the shortcoming that the reliability is not high has the important production practice meaning.
To the utility model discloses, only need use 2 opto-couplers, 6 diodes, 5 resistance, 2 electric capacity, can creatively realize lacking the detection function of looks.
The utility model discloses, solved the current three-phase input and lacked the problem that the phase detection analog circuit exists carries out sampling and signal processing through the circuit of complicacy, simplified the device, improved the reliability.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of 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 with a function of isolating and detecting the phase loss of a three-phase voltage 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 an input phase line L3 of a three-phase alternating current 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 the function of detecting the phase loss of three-phase voltage as claimed in claim 1, wherein the three-phase ac input power is 380V rated ac input power.
4. The circuit for realizing the function of isolating and detecting the open phase of the three-phase voltage according to claim 1, wherein the isolation sampling is realized by adopting optocouplers U1 and U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121413312.7U CN217305332U (en) | 2021-06-24 | 2021-06-24 | Circuit for isolating and detecting phase loss function of three-phase voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121413312.7U CN217305332U (en) | 2021-06-24 | 2021-06-24 | Circuit for isolating and detecting phase loss function of three-phase voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217305332U true CN217305332U (en) | 2022-08-26 |
Family
ID=82912990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121413312.7U Active CN217305332U (en) | 2021-06-24 | 2021-06-24 | Circuit for isolating and detecting phase loss function of three-phase voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217305332U (en) |
-
2021
- 2021-06-24 CN CN202121413312.7U patent/CN217305332U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105572523A (en) | AC detection circuit | |
| CN101614795B (en) | Default-phase signal detection circuit for three-phase power | |
| CN217305332U (en) | Circuit for isolating and detecting phase loss function of three-phase voltage | |
| CN108982981A (en) | A kind of lack detection circuit of multiple pulse rectification circuit | |
| CN203513016U (en) | Power supply open-phase protection device of lift control cabinet | |
| CN217112498U (en) | Support anti-interference electricity degree metering device | |
| CN102222887B (en) | Under-voltage supervision circuit | |
| CN206225989U (en) | Three-phase voltage open-phase protection circuit | |
| CN113376450A (en) | Circuit for isolating and detecting phase loss function of three-phase voltage | |
| CN103472354A (en) | Switching-closing judging circuit of electric leakage reclosure breaker | |
| CN211529816U (en) | Automatic change-over switch position signal detection circuit and automatic change-over switch | |
| CN203502529U (en) | Switching on/of judging circuit of electric leakage reclosure breaker | |
| CN211687833U (en) | Door lock data acquisition system of elevator | |
| CN211018407U (en) | Integrated controller and control cabinet | |
| CN204166102U (en) | A kind of strong electrically driven (operated) switch condition detection circuit | |
| CN208836035U (en) | The control system of permanent magnet synchronous motor with position sensor | |
| CN210038065U (en) | Circuit structure capable of judging zero breaking and phase breaking of circuit breaker | |
| CN101867309A (en) | Univoltage switch status conversion circuit | |
| CN207424116U (en) | Detection circuit | |
| CN211225921U (en) | Power failure detection circuit applied to elevator backup power supply | |
| CN201742312U (en) | Single-voltage switch state converting circuit | |
| CN202997504U (en) | Electronic overload relay with open-phase protection function | |
| CN202888793U (en) | Open-phase protection circuit | |
| CN205407230U (en) | Converter with prevent that input lacks looks function | |
| CN205583660U (en) | Output overcurrent protection circuit of frequency converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |