Detection device of three-phase power supply and three-phase electrical equipment

Abstract

The utility model relates to the technical field of power supply detection, and provides a three-phase power supply detection device and three-phase electrical equipment. The detection device comprises a processor and three signal processing modules in one-to-one correspondence with three-phase power supply input ends of a three-phase power supply, and each signal processing module comprises a voltage dividing unit, a rectifying unit, a filtering unit and an AND gate unit. The processor is used for receiving the output signals of the three AND gate units and determining whether the corresponding power input ends are open-phase or not according to the output signals. According to the utility model, the three signal processing modules respectively output the output signal reflecting whether each power supply input end is open-phase or not to the processor, and the processor determines whether open-phase exists in the three-phase power supply input ends and locates the open-phase power supply input end. The detection circuit provided by the invention realizes high-efficiency detection of the phase loss of the power supply.

Description

Technical Field

[0001] The present application relates to the technical field of power supply detection, and in particular to a three-phase power supply detection device and a three-phase electrical device. Background Art

[0002] The detection circuit of the commonly used three-phase power supply can be as follows Figure 1 As shown, the three input ends of the three-phase input power line are each divided by a resistor and rectified by a diode, and then stabilized by a voltage regulator diode and output to the MCU (Micro Control Unit) through an optocoupler. When the three-phase input power line is not missing a phase, the signal received by the MCU from the optocoupler is low. When there is a phase missing in the three-phase input power line, the signal received by the optocoupler becomes intermittent, and the signal received by the MCU from the optocoupler is a square wave signal. The MCU will detect the number of rising edges of the square wave signal. When the number of rising edges detected within a certain period of time reaches the set number, it is determined that there is a phase missing in the current three-phase input power line.

[0003] This phase loss circuit implements basic phase loss detection, but cannot determine which phase of the three-phase input power line is lost. After detecting the phase loss, all three input terminals of the three-phase input power line can only be checked and re-inserted, resulting in low detection efficiency.

[0004] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve. Utility Model Content

[0005] In view of this, an embodiment of the present application provides a three-phase power supply detection device and a three-phase electrical device to solve the problem that the existing technology cannot locate the phase loss.

[0006] In a first aspect of an embodiment of the present application, a three-phase power supply detection device is provided, comprising a processor and three signal processing modules corresponding one-to-one to three-phase power supply input terminals of the three-phase power supply, wherein:

[0007] Each signal processing module includes a voltage divider unit, a rectifier unit, a filter unit, and an AND gate unit, wherein a first end of the voltage divider unit is connected to an input end of each phase power supply, a second end of the voltage divider unit is connected to a first end of the rectifier unit, a second end of the rectifier unit is connected to a first end of the filter unit, a second end of the filter unit is connected to an inverting input end of the AND gate unit, a non-inverting input end of the AND gate unit is connected to a preset power supply, and an output end of the AND gate unit is connected to an input end of the processor;

[0008] The processor is used to receive the output signals of the three AND gate units respectively and determine whether the corresponding power input end is phase-lost according to the output signals.

[0009] According to a second aspect of the embodiments of the present application, a three-phase electrical device is provided, including a three-phase electrical device body and a detection device for a three-phase power supply as described above.

[0010] Compared with the prior art, the embodiments of the present application have at least the following beneficial effects: the embodiments of the present application use three signal processing modules corresponding one-to-one to the three-phase power input terminals to output output signals to the processor reflecting whether each power input terminal is phase-deficient. Each signal processing module performs voltage division, rectification, filtering, and AND gate judgment based on the corresponding connected power input terminal. If the final output signal is high, the power input terminal has not been phase-deficient; if the output signal is low, the power input terminal has been phase-deficient. The processor will determine whether there is a phase-deficient state in the three-phase power input terminal and locate the power input terminal with the phase-deficient state based on these three output signals. According to the detection circuit of this embodiment, it is possible to intuitively and accurately determine whether the three-phase power input terminal is phase-deficient. At the same time, when a phase-deficient state exists, the power input terminal with the phase-deficient state can be quickly located in the three-phase power input terminal, thereby achieving efficient detection of power phase-deficient state. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0012] Figure 1 It is a structural diagram of a detection circuit of a three-phase power supply commonly used in the prior art;

[0013] Figure 2 1 is a schematic structural diagram of a three-phase power supply detection device provided in an embodiment of the present application;

[0014] Figure 3 1 is a schematic structural diagram of another three-phase power supply detection device provided in an embodiment of the present application;

[0015] Figure 4 1 is a schematic structural diagram of another three-phase power supply detection device provided in an embodiment of the present application;

[0016] Figure 5 It is a structural diagram of a specific three-phase power supply detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0018] A three-phase power supply detection device and a three-phase electrical device according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0019] Figure 2 This is a schematic diagram of the structure of a three-phase power supply detection device provided in an embodiment of the present application. Figure 2 As shown, the detection device includes a processor 20 and three signal processing modules 21 corresponding to the three-phase power input terminals of the three-phase power supply, wherein:

[0020] Each signal processing module 21 includes a voltage divider unit 211, a rectifier unit 212, a filter unit 213, and an AND gate unit 214. The first end of the voltage divider unit 211 is connected to the input end of each phase power supply, the second end of the voltage divider unit 211 is connected to the first end of the rectifier unit 212, the second end of the rectifier unit 212 is connected to the first end of the filter unit 213, the second end of the filter unit 213 is connected to the inverting input end of the AND gate unit 214, the non-inverting input end of the AND gate unit 214 is connected to a preset power supply, and the output end of the AND gate unit 214 is connected to one input end of the processor 20.

[0021] The processor 20 is configured to receive the output signals of the three AND gate units 214 respectively and determine whether the corresponding power input terminal is phase-lost according to the output signals.

[0022] It is understood that the three-phase power supply in this embodiment refers to a three-phase AC power supply. The three-phase power supply is provided with a three-phase power input terminal. Each phase power input terminal outputs a single-phase AC power of a specific frequency, a specific voltage, and a specific phase. The frequency and voltage of the AC power output by the three-phase power input terminal are the same, and there is a phase difference. Theoretically, the phase difference is 120°. Compared with a single-phase power supply, a three-phase power supply has the advantages of greater power and higher efficiency, and is widely used in various types of industrial AC equipment, such as engines. For electrical equipment driven by a three-phase power supply, its input power must be a three-phase AC power that meets the requirements. If one phase of the three-phase AC power fails to be normally input to the electrical equipment, the electrical equipment will not be able to operate normally. Abnormal power supply may also cause the electrical equipment to malfunction. Therefore, whether the three-phase power input of the electrical equipment is normal must be tested, which is exactly the purpose of the three-phase power detection device in this embodiment.

[0023] Specifically, the detection device in this embodiment performs phase loss detection on the three-phase power input end. When the three-phase power input end is connected to the electrical equipment, it outputs three-phase electricity to drive the electrical equipment. When the three-phase power input end is connected to the detection device in this embodiment, the detection device will receive the three-phase electricity output by the three-phase power input end and detect it.

[0024] Specifically, the detection device in this embodiment includes a processor and three signal processing modules, wherein the three signal processing modules correspond to the three-phase power input terminals respectively. The voltage output by each phase power input terminal passes through the voltage divider unit, rectifier unit, filter unit and AND gate unit of each signal processing module to output an output signal within the level range of the processor's readable signal. The processor determines whether there is a phase loss based on the three output signals received.

[0025] It can be understood that the voltage divider unit 211 is used to divide the high voltage output from the power input end to reduce the voltage in the subsequent circuit. Therefore, the voltage divider unit 211 is usually implemented in the form of one or more resistors. Multiple resistors can be optionally connected in series, but the specific resistor model and connection method can be selected according to the actual circuit conditions to ensure that the resistor operates within the working range.

[0026] Furthermore, the rectifier unit 212 is used to rectify alternating current into direct current in the same direction. The specific implementation method of the rectifier unit 212 can be a half-wave rectifier circuit, a full-wave rectifier circuit or a bridge rectifier circuit. The half-wave rectifier circuit, the full-wave rectifier circuit and the bridge rectifier circuit can all be implemented by diodes. The specific selection can be made according to the overall situation of the actual circuit and user needs, and there is no restriction here.

[0027] Furthermore, filter unit 213 is used to filter the pulsating DC power output by rectifier unit 212, outputting DC power with a smoother waveform. Therefore, filter unit 213 can be implemented using an inductor and / or a capacitor. Typically, the inductor is arranged in series within filter unit 213, with the DC power passing through the inductor. The capacitor is a grounded capacitor, with one end of the capacitor connected to the DC power and the other end connected to ground. Furthermore, the specific number and connection relationship of the inductors and capacitors within filter unit 213 can be set and selected based on actual filtering requirements and are not limited herein.

[0028] Therefore, in this embodiment: the voltage dividing unit 211 includes one or more resistors; the filtering unit 213 includes one or more grounding capacitors and / or one or more inductors.

[0029] Correspondingly, in this embodiment, the rectifier unit 212 is a half-wave rectifier circuit including a rectifier diode.

[0030] Alternatively, the rectifier unit 212 is a full-wave rectifier circuit including a rectifier diode.

[0031] Alternatively, the rectifying unit 212 is a bridge rectifying circuit including rectifying diodes.

[0032] Furthermore, the AND gate unit 214 is used to compare the voltage output by the current filtering unit 213 with the AND logic operation result of the preset power supply. The preset power supply is a DC power supply that maintains a high level, so that the positive input terminal of the AND gate unit 214 maintains a high level. If the voltage output by the current filtering unit 213 is a high level, the AND gate unit 214 performs an AND logic operation, and the AND gate unit 214 outputs a high-level output signal. If the voltage output by the current filtering unit 213 is a low level, the AND gate unit 214 performs an AND logic operation, and the AND gate unit 214 outputs a low-level output signal.

[0033] It can be understood that for any signal processing module 21, if there is AC power at the corresponding power input end of the three-phase power supply, then after passing through the voltage divider unit 211, the rectifier unit 212 and the filter unit 213, the voltage output by the filter unit 213 is a high level; if there is no AC power at the power input end, that is, it is manifested as a phase loss, then no voltage passes through the voltage divider unit 211, the rectifier unit 212 and the filter unit 213, and the power output by the filter unit 213 is a low level.

[0034] Furthermore, the processor 20 receives the output signals of the three AND gate units 214. Since each output signal reflects whether the corresponding power input terminal has power, the processor can determine whether the corresponding power input terminal has a phase loss based on the three output signals. If all three output signals are high, the current three-phase power supply is normal and none of the three-phase power input terminals are short of power. If any of the three output signals is low, it is determined that the current three-phase power supply is abnormal, and the cause of the power supply anomaly is a phase loss. The actual meaning of phase loss is that at least one phase of the three-phase power supply is not outputting normally. For the detection device, the power output terminal without normal output is short of power, and the short of power input terminal corresponds to the low-level output signal. The processor 20 can perform further processing measures based on the determination result, such as outputting display information, issuing an alarm, executing a phase loss protection action, etc.

[0035] Furthermore, in addition to the fact that the processor 20 can generate a determination result as an external phase-loss conclusion, the detection device of this embodiment is also provided with a display unit 215 to intuitively show whether the corresponding power input terminal is phase-loss. Specifically, each signal processing module 21 is provided with a display unit 215. The display unit 215 is used to indicate whether there is electricity passing through itself, and to establish a direct connection between whether there is electricity passing through itself and whether there is a power shortage at the power input terminal: if there is no power shortage at the power input terminal, then there must be electricity passing through the display unit 215. If there is a power shortage at the power input terminal, then there is no electricity passing through the display unit 215. To this end, the display unit 215 in this embodiment can be connected between the filter unit 213 and the AND gate unit 214, such as Figure 3In the example shown, alternatively, the display unit may also be connected between the display unit 215 and the processor 20, as shown in FIG. Figure 4 The example shown. Therefore:

[0036] Each signal processing module 21 further includes a display unit 215 for indicating whether electricity passes through it; the filter unit 213 is connected to the AND gate unit 214 through the display unit 215, or the AND gate unit 214 is connected to the processor 20 through the display unit 215.

[0037] Furthermore, the display unit 215 can be implemented by a light emitting diode (LED). The specific selection and operating parameter range of the light emitting diode (LED) can be set and selected according to actual circuit conditions and are not limited here.

[0038] Therefore, in an exemplary embodiment, the display unit 215 is a light emitting diode;

[0039] When the filter unit 213 is connected to the AND gate unit 214 through the display unit 215, the internal current of the light emitting diode flows from the filter unit 213 to the AND gate unit 214;

[0040] When the AND gate unit 214 is connected to the processor 20 through the display unit 215 , the internal current of the light emitting diode flows from the AND gate unit 214 to the processor 20 .

[0041] At this time, if two of the three LEDs are emitting light but one is not, it is determined that the power input terminal corresponding to the non-emitting LED is out of power, and the specific power input terminal can be located according to the physical connection relationship.

[0042] Furthermore, to distinguish the three power input terminals, the three LEDs can be configured to emit different colors. If a particular LED is not illuminated, the corresponding power input terminal can be identified as being shorted based on the color of the remaining LED. For example, if the three LEDs are configured to emit red, yellow, and green, corresponding to the R / S / T three-phase power input terminals, respectively, if the green LED is not illuminated, a phase of the three-phase power supply can be determined to be shorted, and the shorted phase can be determined to be the T phase.

[0043] It is understood that the processor 20 in this embodiment can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), MCUs, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Depending on the type of processor 20, a corresponding communication protocol and communication interface are selected accordingly. For example, when the processor 20 is implemented as an MCU, the interface used by the processor 20 to receive the output signal of the AND gate unit 214 is a GPIO (General Purpose Input Output) interface.

[0044] Furthermore, the processor 20 performs further processing measures based on the determination result, including alarms, displays, and execution of phase loss protection actions. The alarm is triggered by triggering an alarm unit, which may specifically include a warning light, a buzzer, a display screen, etc. The execution of the phase loss protection action is achieved by issuing an action instruction to a protection switch. The protection switch is typically located between the three-phase power input terminal and the electrical equipment, controlling the power supply from the three-phase power input terminal to the electrical equipment. The opening and closing of the protection switch is controlled by the processor 20. The display is achieved via a display screen, which receives the display signal output by the processor and displays a corresponding image. The image content includes: no phase loss, a phase loss, and the corresponding power input terminal. If the light-emitting diodes correspond to different luminous colors, the corresponding relationship between the power input terminals and the luminous colors, whether the light-emitting diodes are illuminated, and other details can also be displayed. In addition, the display screen can also indicate the specific execution status of whether the phase loss protection action is executed. The specific display content of the display screen can be set according to actual conditions and user needs and is not limited here.

[0045] Therefore, in some specific embodiments, the detection device further includes a display screen connected to the processor 20;

[0046] The processor 20 is further configured to determine whether a corresponding power input terminal is phase-lost based on the output signal, and output a corresponding display signal to the display screen.

[0047] Furthermore, in some specific embodiments, each light emitting diode emits a different light color;

[0048] The processor 20 is further configured to, when there is a power input terminal with a missing phase, determine the luminous color of the light-emitting diode corresponding to the power input terminal with the missing phase.

[0049] Furthermore, in some specific embodiments, the detection device further includes a display screen connected to the processor 20;

[0050] The processor 20 is further configured to determine whether the corresponding power input terminal is phase-lost and the luminous color of the light-emitting diode corresponding to the phase-lost power input terminal according to the output signal, and output a corresponding display signal to the display screen.

[0051] Furthermore, in some specific embodiments, the processor 20 is further configured to:

[0052] When it is determined that at least one phase of the power input terminal is missing, a phase-missing protection action is executed.

[0053] It is understandable that after the processor 20 executes the corresponding processing measures, the staff can troubleshoot the missing phase power input terminal based on the displayed information. The cause of the fault may be disconnection or lack of actual voltage input at the power input terminal, which requires further inspection and determination by the staff.

[0054] For details, see Figure 5 The detection device shown, Figure 5 is a structural diagram of a specific detection device. Figure 5 Considering the cost and number of components, the detection device includes the voltage divider unit 211, which is two series resistors; the rectifier unit 212, which is a half-wave rectifier unit of a rectifier diode; the filter unit 213, which is a grounded capacitor; the three AND gate units 214 of the three signal processing modules 21, which can be implemented by a digital chip 74LS11; the display unit 215, which is a light-emitting diode, is provided between the filter unit 213 and the AND gate unit 214; and the processor 20, which is specifically an MCU. It is understood that Figure 5 The detection device in the embodiment achieves efficient power phase loss detection with a relatively low number of components. On this basis, the number, structure, and model of components can be increased or modified according to actual conditions and user needs to ensure that the component selection conforms to the actual circuit conditions. There is no restriction here.

[0055] The embodiment of the present application uses three signal processing modules corresponding one-to-one to the three-phase power input terminals to output output signals to the processor reflecting whether each power input terminal is missing a phase. Each signal processing module performs voltage division, rectification, filtering, and AND gate judgment based on the corresponding connected power input terminal. If the final output signal is high, the power input terminal has not experienced a phase loss; if the output signal is low, the power input terminal has experienced a phase loss. The processor will determine whether there is a phase loss in the three-phase power input terminal and locate the power input terminal with the missing phase based on these three output signals. According to the detection circuit of this embodiment, it is possible to intuitively and accurately determine whether the three-phase power input terminal is missing a phase. At the same time, when a phase loss exists, the power input terminal with the missing phase can be quickly located in the three-phase power input terminal, thereby achieving efficient detection of power phase loss.

[0056] All of the above optional technical solutions can be combined in any way to form optional embodiments of the present application, and will not be described in detail here. It should be understood that the order of the sequence numbers of the steps in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0057] An embodiment of the present application further provides a three-phase electrical device, comprising a three-phase electrical device body and a three-phase power supply detection device as described in any one of the above items.

[0058] It is understood that the three-phase electrical device body in this embodiment refers to an electrical device driven by a three-phase power supply. The front end of the three-phase electrical device body is connected to the three-phase power supply through the three-phase power supply detection device, and the three-phase power supply is used to power the three-phase electrical device body through the three-phase power supply detection device.

[0059] It can be understood that the specific content of the three-phase power supply detection device in this embodiment can refer to the detailed description in the above embodiment, and will not be repeated here.

[0060] It can be understood that the three-phase electrical equipment in this embodiment has the same beneficial effects as the three-phase power supply detection device. For details, please refer to the description in the above embodiment and will not be repeated here.

[0061] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0062] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. The computer program may include computer program code, which may be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0063] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A three-phase power supply detection device, characterized in that: It includes a processor and three signal processing modules corresponding to the three-phase power input terminals of the three-phase power supply, wherein: Each of the signal processing modules includes a voltage divider unit, a rectifier unit, a filter unit, and an AND gate unit, wherein a first end of the voltage divider unit is connected to an input end of each phase power supply, a second end of the voltage divider unit is connected to a first end of the rectifier unit, a second end of the rectifier unit is connected to a first end of the filter unit, a second end of the filter unit is connected to an inverting input end of the AND gate unit, a non-inverting input end of the AND gate unit is connected to a preset power supply, and an output end of the AND gate unit is connected to an input end of the processor; The processor is used to receive the output signals of the three AND gate units respectively and determine whether the corresponding power input end is phase-lost according to the output signals.

2. The detection device according to claim 1, characterized in that The voltage dividing unit includes one or more resistors; The filtering unit includes one or more grounded capacitors and / or one or more inductors.

3. The detection device according to claim 1, characterized in that The rectifier unit is a half-wave rectifier circuit including a rectifier diode. Or, the rectifier unit is a full-wave rectifier circuit including a rectifier diode, Alternatively, the rectifier unit is a bridge rectifier circuit including a rectifier diode.

4. The detection device according to claim 1, characterized in that Also included is a display screen connected to the processor; The processor is further configured to determine whether the corresponding power input terminal is phase-lost according to the output signal, and output a corresponding display signal to the display screen.

5. The detection device according to claim 1, characterized in that Each of the signal processing modules further includes a display unit for indicating whether electricity passes through the module; The filtering unit is connected to the AND gate unit through the display unit, or the AND gate unit is connected to the processor through the display unit.

6. The detection device according to claim 5, characterized in that The display unit is a light emitting diode; When the filter unit is connected to the AND gate unit through the display unit, the internal current of the light emitting diode flows from the filter unit to the AND gate unit; When the AND gate unit is connected to the processor through the display unit, the direction of the internal current of the light emitting diode is from the AND gate unit to the processor.

7. The detection device according to claim 6, characterized in that Each of the light emitting diodes emits a different color; The processor is further configured to, when a phase of the power input terminal is missing, determine the luminous color of the light-emitting diode corresponding to the phase-missing power input terminal.

8. The detection device according to claim 7, characterized in that Also included is a display screen connected to the processor; The processor is further configured to determine whether the corresponding power input terminal is phase-lost and the luminous color of the light-emitting diode corresponding to the phase-lost power input terminal based on the output signal, and output a corresponding display signal to the display screen.

9. The detection device according to any one of claims 1 to 8, characterized in that: The processor is further configured to: When it is determined that at least one phase of the power input terminal is missing, a phase-missing protection action is executed.

10. A three-phase electrical device, characterized in that: The invention comprises a three-phase electrical equipment body and a detection device for a three-phase power supply as claimed in any one of claims 1 to 9.

Images