CN112666494A - Circuit for detecting three-phase mains power failure - Google Patents
Circuit for detecting three-phase mains power failure Download PDFInfo
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- CN112666494A CN112666494A CN202011609380.0A CN202011609380A CN112666494A CN 112666494 A CN112666494 A CN 112666494A CN 202011609380 A CN202011609380 A CN 202011609380A CN 112666494 A CN112666494 A CN 112666494A
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Abstract
The application relates to a detect circuit that three-phase commercial power falls down relates to the commercial power and falls down the technical field that detects, include: three relay K, relay K includes coil L and switch M, every coil L is coupled between the zero line and a live wire of three-phase commercial power, and is three switch M establishes ties and forms a circuit, the one end of circuit inserts the power VCC as the input, the other end of circuit is through concatenating a resistance R4 back ground connection, and will the one end that the earthing terminal was kept away from to resistance R4 is as the output, the output is configured into the output signal of telecommunication. This application can detect out fast whether three-phase commercial power falls down, and circuit composition simple structure, low cost.
Description
Technical Field
The application relates to the technical field of mains supply power failure detection, in particular to a circuit for detecting three-phase mains supply power failure.
Background
With the rapid development of industrialization, the requirements of electric equipment on power supply reliability are higher and higher, and the power supply reliability is closely related to the timely detection of the power failure of the mains supply.
Generally, a mains supply power failure detection circuit adopts two modes, one mode is that a hardware circuit is utilized to carry out voltage division, rectification, isolation and shaping on three-phase mains supply to generate a power frequency square wave pulse, and then whether power failure occurs is judged by detecting whether a pulse is input in a power frequency period; and the other method is to utilize a pure software mode, sample the three-phase commercial power and compare the three-phase commercial power with a set threshold value to judge whether the power is off or not. However, both of these two methods need to adopt more hardware components to obtain the commercial power failure information, and also need a certain sampling period.
In the related technology, a method for detecting the power failure of a three-phase mains supply is disclosed, the method samples the instantaneous value of the voltage of the three-phase mains supply in real time, and carries out simple logic operation on the instantaneous value of the voltage of the three-phase mains supply to obtain a voltage difference value; and meanwhile, according to the effective value of the three-phase mains supply voltage, determining a correct threshold interval of the three-phase mains supply voltage, and judging whether the voltage difference value is in the threshold interval so as to quickly judge whether the three-phase mains supply voltage is powered down. Therefore, the related technology can detect the commercial power abnormity, but needs to sample the commercial power voltage in real time, and can judge whether the commercial power is powered down or not by carrying out operation judgment on the sampling signal.
Therefore, in the actual power failure detection process, more hardware components and certain sampling period are needed for sampling voltage or current, so that the cost of the mains power failure is higher and the detection speed is limited.
Disclosure of Invention
The embodiment of the application provides a circuit for detecting power failure of a three-phase mains supply, so that whether the three-phase mains supply is powered down or not can be detected quickly and simply.
The embodiment of the application provides a circuit that detects three-phase commercial power and loses power, it includes:
three relay K, relay K includes coil L and switch M, every coil L is coupled between the zero line and a live wire of three-phase commercial power, and is three switch M establishes ties and forms a circuit, the one end of circuit inserts the power VCC as the input, the other end of circuit is through concatenating a resistance R4 back ground connection, and will the one end that the earthing terminal was kept away from to resistance R4 is as the output, the output is configured into the output signal of telecommunication.
In some embodiments, the switch M comprises a normally open contact.
In some embodiments, the electrical signal is a high-low level signal.
In some embodiments, the positive pole of the coil L is connected to the live wire and the negative pole is connected to the neutral wire.
In some embodiments, the coil L is sized to accommodate an ac 220V voltage.
In some embodiments, three of the relays K are of the same size.
In some embodiments, it further comprises:
and each coil L is connected with one relay protection circuit in parallel.
In some embodiments, the relay protection circuit includes an RC circuit.
In some embodiments, the RC circuit includes a resistor R and a capacitor C, which are connected in parallel.
In some embodiments, the relay protection circuit includes a diode D connected in anti-parallel with the coil L.
The beneficial effect that technical scheme that this application provided brought includes: whether three-phase commercial power is cut off can be detected out fast, and circuit composition simple structure, low cost.
The embodiment of the application provides a circuit for detecting three-phase mains supply power failure, wherein each phase is connected with a relay coil in series and each relay switch in series to form a circuit for outputting an electric signal; whether the three-phase commercial power is powered off or not directly causes the power on/off of the relay coil on the corresponding phase to be changed, so that the action of a relay switch on the circuit is controlled to change an electric signal output by the output end of the circuit, and whether the three-phase commercial power is powered off or not is directly determined through the output electric signal. Therefore, the circuit for detecting the power failure of the three-phase mains supply in the embodiment of the application does not need to sample the voltage or the current of the three-phase mains supply, does not need to further calculate and process the sampled information to determine, and can determine whether the three-phase mains supply is powered down or not more quickly.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit diagram of a circuit for detecting a three-phase mains power failure according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a circuit for detecting power failure of a three-phase mains supply, which can quickly detect whether the power failure of the three-phase mains supply occurs or not, and has a simple structure and low cost.
As shown in fig. 1, an embodiment of the present application provides a circuit for detecting a three-phase mains power failure, which includes:
three relay K, relay K includes coil L and switch M, every coil L is coupled between the zero line and a live wire of three-phase commercial power, and is three switch M establishes ties and forms a circuit, the one end of circuit inserts the power VCC as the input, the other end of circuit is through concatenating a resistance R4 back ground connection, and will the one end that the earthing terminal was kept away from to resistance R4 is as the output, the output is configured into the output signal of telecommunication.
The embodiment of the application provides a detect circuit that three-phase commercial power falls down, its theory of operation is:
when the three-phase mains supply is not powered off, the three coils L are powered on, the corresponding switches M are in a closed state, a circuit formed by the three switches M is in an open state, one end of the circuit is connected with a power supply VCC, and at the moment, the output end outputs a first signal;
when any phase of the three-phase mains supply is powered off, the coil L on the phase is powered off, then the switch M on the phase acts, the corresponding switch M is turned on, then a circuit formed by the three switches M is in an open circuit state, the other end of the circuit is grounded after being connected with a resistor R4 in series, at the moment, the output end outputs a second signal different from the first signal, and whether the three-phase mains supply is powered off or not is determined according to the first signal or the second signal which is output.
Preferably, the switch M comprises a normally open contact. In this embodiment, the switch M includes a normally open contact, so that when the three-phase mains supply is in a normal state, the three coils L are all powered on to control the three switches M to be closed, and further, a line where the three switches M are located is in an access state; when at least one phase of the three-phase mains supply is abnormal in power failure, the coil L on the corresponding phase loses power, the corresponding switch M is further controlled to be opened, and the circuit where the three switches M are located is broken.
Preferably, the electrical signal is a high-low level signal. When the three-phase mains supply is in a normal state, the three coils L are all electrified to control the three switches M to be closed, and then the circuit where the three switches M are located is in a circuit state; when at least one phase of the three-phase mains supply is in power failure abnormality, the coil L on the corresponding phase loses power, the corresponding switch M is further controlled to be opened, the circuit where the three switches M are located is broken, at the moment, the three switches are grounded through the resistor R4, and therefore the output end outputs a low-level signal.
Further, the positive pole of the coil L is connected with the live wire, and the negative pole of the coil L is connected with the zero line.
Preferably, the coil L is dimensioned for an alternating 220V voltage. The coil L is used in the three-phase ac commercial power environment in this embodiment, and in order to ensure normal use of the coil L, the specification of the coil L is adapted to the ac 220V voltage to meet the use safety index.
Preferably, the three relays K are the same size. The current of each phase on the three-phase commercial power is the same, and the phase angle difference value on the adjacent two phases is the same, so the same relay K is adopted to be connected in series on the three-phase commercial power to ensure the three-phase electric balance on the three-phase commercial power.
Preferably, it further comprises:
and each coil L is connected with one relay protection circuit in parallel. In this embodiment, each coil L is connected in parallel with a relay protection circuit, and the relay protection circuit absorbs energy lost by power failure of the three-phase mains supply.
As an example of the relay protection circuit, as shown in fig. 1, the relay protection circuit includes an RC circuit.
Further, the RC circuit comprises a resistor R and a capacitor C, and the resistor R and the capacitor C are connected in parallel.
As another embodiment of the relay protection circuit, the relay protection circuit includes a diode D connected in inverse parallel with the coil L. In this embodiment, the anode of the diode D is connected to the cathode of the coil L, and the cathode is connected to the anode of the coil L. The diode D is known to those skilled in the art and will not be described herein.
As shown in fig. 1, an embodiment of the present application specifically provides a circuit for detecting a power failure of a three-phase mains supply, which includes a relay K1, a relay K2, a relay K3, a resistor R1, a capacitor C1, a resistor R2, a capacitor C2, a resistor R3, and a capacitor C3; the relay K1 comprises a coil L1 and a switch M1, the relay K2 comprises a coil L2 and a switch M2, the relay K3 comprises a coil L3 and a switch M3, and the switch M1, the switch M2 and the switch M3 are all normally open switches; the positive electrode of the coil L1 is connected with a live wire UA, the negative electrode of the coil L1 is connected with a zero wire UN, and the resistor R1, the capacitor C1 and the coil L1 are both connected in parallel; the positive electrode of the coil L2 is connected with a live wire UB, the negative electrode of the coil L2 is connected with a zero wire UN, and the resistor R2, the capacitor C2 and the coil L2 are both connected in parallel; the positive electrode of the coil L3 is connected with a live wire UC, the negative electrode of the coil L3 is connected with a zero line UN, and the resistor R3, the capacitor C3 and the coil L3 are both connected in parallel; the switch M1, the switch M2 and the switch M3 are connected in series to form a circuit, one end of the circuit is connected with a forward Power VCC, the other end of the circuit is connected in series with a resistor R4 and then grounded GND, one end of the resistor R4 far away from the ground is used as an output end, and the output end Power _ Off is configured to output a high level or a low level.
When the three-phase mains supply is not powered down, the coil L1, the coil L2 and the coil L3 are all powered on, the switch M1, the switch M2 and the switch M3 are all closed, a circuit formed by connecting the switch M1, the switch M2 and the switch M3 in series is in a pass state, the voltage potential of the output end is the same as the voltage potential of a power supply, and therefore a high-level signal is output; when any phase of three-phase mains supply is powered off, the coil L on the phase is powered off, the corresponding switch M is switched from closed to open, a circuit formed by the switch M1, the switch M2 and the switch M3 is in an open circuit state, and the other end of the circuit is grounded after being connected in series with a resistor R4, so that the voltage potential of the output end is zero, and a low-level signal is output; therefore, in the embodiment, whether the three-phase mains supply is powered down or not can be directly determined according to the level of the output, and the method is simple and rapid.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A circuit for detecting a three-phase mains power failure, comprising:
three relay K, relay K includes coil L and switch M, every coil L is coupled between the zero line and a live wire of three-phase commercial power, and is three switch M establishes ties and forms a circuit, the one end of circuit inserts the power VCC as the input, the other end of circuit is through concatenating a resistance R4 back ground connection, and will the one end that the earthing terminal was kept away from to resistance R4 is as the output, the output is configured into the output signal of telecommunication.
2. A circuit for detecting a loss of mains power in three phases according to claim 1, wherein the switch M comprises a normally open contact.
3. The circuit for detecting a three-phase mains power failure of claim 1, wherein the electrical signal is a high-low level signal.
4. The circuit for detecting the power failure of a three-phase mains supply according to claim 1, wherein an anode of the coil L is connected to the live wire and a cathode thereof is connected to the neutral wire.
5. The circuit for detecting a three-phase mains power failure according to claim 1, wherein the coil L is sized to accommodate an ac 220V voltage.
6. The circuit for detecting the power failure of three-phase mains supply according to claim 1, wherein the three relays K have the same specification.
7. The circuit for detecting a three-phase mains power failure of claim 1, further comprising:
and each coil L is connected with one relay protection circuit in parallel.
8. The circuit for detecting a three-phase mains power failure of claim 7, wherein the relay protection circuit comprises an RC circuit.
9. The circuit for detecting three-phase mains power failure according to claim 8, wherein the RC circuit comprises a resistor R and a capacitor C, and the resistor R and the capacitor C are connected in parallel.
10. The circuit for detecting a power failure in a three-phase mains supply of claim 8, wherein the relay protection circuit includes a diode D connected in anti-parallel with the coil L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011609380.0A CN112666494A (en) | 2020-12-30 | 2020-12-30 | Circuit for detecting three-phase mains power failure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011609380.0A CN112666494A (en) | 2020-12-30 | 2020-12-30 | Circuit for detecting three-phase mains power failure |
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| CN112666494A true CN112666494A (en) | 2021-04-16 |
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| CN202011609380.0A Pending CN112666494A (en) | 2020-12-30 | 2020-12-30 | Circuit for detecting three-phase mains power failure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113232694A (en) * | 2021-06-02 | 2021-08-10 | 中车青岛四方机车车辆股份有限公司 | Three-phase motor power supply system |
| CN114295887A (en) * | 2021-12-22 | 2022-04-08 | 科德数控股份有限公司 | Power failure detection method |
| CN117543788A (en) * | 2024-01-09 | 2024-02-09 | 山东寿光市坤隆石油机械股份有限公司 | New forms of energy screw pump power supply control system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113232694A (en) * | 2021-06-02 | 2021-08-10 | 中车青岛四方机车车辆股份有限公司 | Three-phase motor power supply system |
| CN114295887A (en) * | 2021-12-22 | 2022-04-08 | 科德数控股份有限公司 | Power failure detection method |
| CN114295887B (en) * | 2021-12-22 | 2023-07-18 | 科德数控股份有限公司 | Power failure detection method |
| CN117543788A (en) * | 2024-01-09 | 2024-02-09 | 山东寿光市坤隆石油机械股份有限公司 | New forms of energy screw pump power supply control system |
| CN117543788B (en) * | 2024-01-09 | 2024-04-02 | 山东寿光市坤隆石油机械股份有限公司 | New forms of energy screw pump power supply control system |
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