DC signal interference event monitoring method and device, and electronic equipment

Abstract

The invention relates to a direct-current signal interference event monitoring device, and the device comprises signal coupling modules which are connected in series and are used for accessing a direct-current signal loop and extracting an alternating-current signal in the direct-current signal loop; the interference detection module is used for monitoring an interference event according to the alternating current signal and a signal threshold value, and recording time data of the interference event under the condition that the interference event is monitored; and the traceability module is used for matching the time data with an equipment log corresponding to the direct current signal loop and determining an interference source according to a matching result. Through the method and the device, the problem that the direct-current signal interference event is difficult to trace is solved, the interference source is quickly locked through matching of the time data of the interference event and the equipment log, and production technicians are assisted in positioning equipment maloperation reasons.

Description

Technical Field

[0001] This application relates to the field of industrial monitoring, and in particular to methods, apparatus and electronic equipment for monitoring DC signal interference events. Background Technology

[0002] In industrial control systems, DC signals (such as 4-20mA current signals, Pt100 RTD signals, etc.) are susceptible to electromagnetic interference (EMI), leading to measurement jumps or equipment malfunctions. Current technologies typically employ filtering circuits or shielding measures to suppress interference, but these methods cannot record the occurrence time of intermittent interference events. Once the transient interference disappears, it is difficult to trace the cause of the fault on-site, resulting in frequent recurring failures.

[0003] Currently, no effective solution has been proposed to address the difficulty in tracing the source of DC signal interference events in related technologies. Summary of the Invention

[0004] This application provides a method, apparatus, electronic device, and storage medium for monitoring DC signal interference events, in order to at least solve the problem of difficulty in tracing the source of DC signal interference events in related technologies.

[0005] In a first aspect, embodiments of this application provide a DC signal interference event monitoring device, the device comprising: A signal coupling module is used to connect in series to a DC signal circuit and extract the AC signal from the DC signal circuit. An interference detection module is used to monitor interference events based on the AC signal and a signal threshold, and to record the time data of the interference events when they are detected. The source tracing module is used to match the time data with the equipment logs corresponding to the DC signal circuit, and determine the source of interference based on the matching results.

[0006] In some embodiments, the interference detection module includes: A differential amplifier circuit is used to amplify the AC signal to obtain an amplified signal; A threshold comparator is used to compare the amplified signal with the signal threshold to determine whether an interference event has occurred. If so, a trigger signal is output.

[0007] In some embodiments, the threshold comparator includes: A dynamic threshold comparator is used to determine whether an interference event has occurred when the control signal current value of the DC signal loop is not fixed, based on the control signal to obtain a dynamic signal threshold, and based on the dynamic signal threshold and the amplified signal; and / or A fixed threshold comparator is used to determine whether an interference event has occurred based on a preset fixed signal threshold and the amplified signal, when the control signal current value of the DC signal circuit is fixed.

[0008] In some embodiments, the interference detection module further includes a time recording module. The time recording module is communicatively connected to the threshold comparator and is used to record the start time and duration of the interference event based on the real-time clock chip when a trigger signal is received from the threshold comparator.

[0009] In some embodiments, the tracing module includes: The data acquisition module is used to acquire the device startup command and device trip command from the device log, as well as the actual startup time and actual trip time of the device. The analysis module is used to determine whether the interference event is caused by signal interference that causes the equipment to malfunction or trip, based on the equipment start command, the equipment trip command, the actual start time, the actual trip time, and the time data of the interference event.

[0010] In some embodiments, the device further includes an optocoupler isolator for isolating the signal input and signal output.

[0011] In some embodiments, the device further includes a power supply module for supplying power to the signal coupling module, the interference detection module, and the source tracing module via a wide-voltage DC-DC converter.

[0012] In some embodiments, the device further includes: The signal analysis module is communicatively connected to the signal coupling module and has a pre-stored interference type feature database based on historical data. The interference type feature database includes standard signal features corresponding to different interference source types. The signal analysis module is used to extract features from the AC signal to obtain signal features, match the signal features with the interference type feature database, and output a preliminary diagnostic conclusion on the interference type based on the matching result. The tracing module is also used to match the time data with the equipment logs corresponding to the DC signal circuit, and in conjunction with the preliminary diagnostic conclusions, to determine the interference source that caused the interference event.

[0013] Secondly, embodiments of this application provide a method for monitoring DC signal interference events, the method comprising: The signal is connected in series to a DC signal circuit, and the AC signal in the DC signal circuit is extracted. Based on the AC signal and signal threshold, monitor interference events, and if the interference event is detected, record the time data of the interference event; The time data is matched with the device logs corresponding to the DC signal loop, and the source of interference is determined based on the matching results.

[0014] Thirdly, embodiments of this application provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the DC signal interference event monitoring method as described in the second aspect above.

[0015] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the DC signal interference event monitoring method as described in the second aspect above.

[0016] Compared to related technologies, the DC signal interference event monitoring device provided in this application connects to the DC signal circuit in series via a signal coupling module to extract the AC signal from the DC signal circuit. The interference detection module monitors interference events based on the AC signal and signal thresholds, and records the time data of the detected interference event. The tracing module matches the time data with the equipment logs corresponding to the DC signal circuit, and determines the interference source based on the matching results. This solves the problem of difficulty in tracing the source of DC signal interference events. By matching the time data of the interference event with the equipment logs, the interference source can be quickly located, assisting production technicians in locating the cause of equipment malfunctions. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a structural block diagram of a DC signal interference event monitoring device according to an embodiment of this application; Figure 2 This is a flowchart of an interference monitoring process according to an embodiment of this application; Figure 3 This is a schematic diagram of a DC signal interference event monitoring device and its application environment according to an embodiment of this application; Figure 4 This is a flowchart of a DC signal interference event monitoring method according to an embodiment of this application; Figure 5 This is a schematic diagram of the internal structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0019] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0020] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0021] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0022] This embodiment also provides a DC signal interference event monitoring device, which is used to implement the above embodiments and preferred embodiments, and will not be repeated as already described. As used below, the terms "module," "unit," "subunit," etc., can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0023] Figure 1 This is a structural block diagram of a DC signal interference event monitoring device according to an embodiment of this application, such as... Figure 1 As shown, the device includes: a signal coupling module 11, an interference detection module 12, and a source tracing module 13.

[0024] The signal coupling module 11 is used to connect in series to the DC signal circuit and extract the AC signal from the DC signal circuit.

[0025] In DC power supply / signal systems (such as data centers, industrial control, and communication power supplies), the source of abnormal AC interference events is monitored and located. The monitoring device is connected in series in the DC signal circuit without altering the original signal transmission characteristics. Preferably, the input impedance is ≤0.1Ω. For example, the monitoring device can be integrated with the AI, AO, DO, and DI electronic circuits of the DCS equipment to achieve real-time monitoring of interference signals without the need for external equipment.

[0026] Serial connection does not interfere with the original signal, requires no modification to the control system program, and is suitable for large-scale deployment.

[0027] The interference detection module 12 is used to monitor interference events based on AC signals and signal thresholds, and to record the time data of interference events when they are detected.

[0028] The interference detection module performs quality analysis on interference signals, monitoring frequency, amplitude, and other parameters to help production technicians quickly locate the source of interference signals and take effective measures to eliminate them. Optionally, it determines whether the AC amplitude exceeds a threshold; if so, it triggers the recording of the corresponding time data.

[0029] In some embodiments, the interference detection module 12 includes: A differential amplifier circuit is used to amplify AC signals to obtain an amplified signal.

[0030] The threshold comparator is used to compare the amplified signal with the signal threshold to determine whether an interference event has occurred. If so, it outputs a trigger signal.

[0031] The AC signal is amplified using a differential amplifier circuit and a threshold comparator and compared with a signal threshold. If the AC amplitude exceeds the threshold, a trigger signal is output. The trigger signal is used to trigger the recording of time data for interference events.

[0032] In some embodiments, the threshold comparator includes: A dynamic threshold comparator is used to determine whether an interference event has occurred when the control signal current value of the DC signal loop is not fixed. This is done by obtaining a dynamic signal threshold based on the control signal and then using the dynamic signal threshold and the amplified signal.

[0033] In actual circuits, the current value of the control signal may vary, and the trigger threshold needs to be automatically adjusted according to the signal baseline to avoid false triggering due to signal drift.

[0034] For example, the current values ​​of control signals and RTD signals of electric actuators are not fixed and vary within the range of 4-20mA. The amplitude requirements of interference signals are different for 4mA signals and 20mA signals. Therefore, the signal threshold needs to be changed according to the changes in the control signal during monitoring.

[0035] A fixed threshold comparator is used to determine whether an interference event has occurred, based on a preset fixed signal threshold and an amplified signal, when the control signal current value of the DC signal circuit is fixed.

[0036] For signals with fixed current values ​​(such as switch start and stop signals), there is no need to dynamically adjust the threshold; simply set the signal threshold to a fixed value (such as ±10mV).

[0037] In some embodiments, the interference detection module further includes a time recording module.

[0038] The time recording module is connected to the threshold comparator and is used to record the start time and duration of the interference event based on the real-time clock chip when a trigger signal is received from the threshold comparator.

[0039] The start time and duration (or start and end time) of the interference event are recorded using a real-time clock (RTC) chip, and optionally, stored in a non-volatile memory (such as EEPROM). Figure 2 This is a flowchart of an interference monitoring process according to an embodiment of this application.

[0040] Continue to refer to Figure 1 The DC signal interference event monitoring device also includes a source tracing module 13.

[0041] The source tracing module 13 is used to match time data with the equipment logs corresponding to the DC signal circuit and determine the source of interference based on the matching results.

[0042] This embodiment quickly identifies the source of interference (such as equipment start-up / shutdown, lightning strikes, etc.) by matching time data with DCS / PLC logs (historical data files of system events and state changes recorded in chronological order within the distributed control system or programmable logic controller), assisting production technicians in locating the cause of equipment malfunctions. Optionally, time data can be exported via USB / UART interface and analyzed in conjunction with DCS logs to determine the fault period.

[0043] In some embodiments, the tracing module includes: The data acquisition module is used to acquire the device startup command and device trip command from the device log, as well as the actual startup time and actual trip time of the device; The analysis module is used to determine whether the interference event is caused by signal interference that causes the equipment to malfunction or trip, based on the equipment start command, equipment trip command, actual start time, actual trip time, and time data of the interference event.

[0044] In production, sometimes equipment will start or trip for no reason, and the DCS or PLC will not issue any instructions. Therefore, by comparing the equipment start-up or tripping time with the recorded time, it can be determined whether the equipment malfunctions or trips due to signal interference.

[0045] Through the aforementioned device, the signal coupling module 11 is connected in series to the DC signal circuit to extract the AC signal from the DC signal circuit. The interference detection module 12 monitors interference events based on the AC signal and signal threshold, and records the time data of the interference event when it is detected. The tracing module 13 matches the time data with the equipment log corresponding to the DC signal circuit, and determines the interference source based on the matching result, thus solving the problem of difficulty in tracing the source of DC signal interference events. This provides a lightweight solution to the problem of difficulty in capturing intermittent interference in industrial settings. By matching the time data of interference events with the equipment log, the interference source can be quickly located, assisting production technicians in locating the cause of equipment malfunctions. The series connection does not interfere with the original signal, requires no modification to the control system program, and is suitable for large-scale deployment.

[0046] In some embodiments, the DC signal interference event monitoring device further includes an optocoupler isolator for isolating the signal input and signal output terminals.

[0047] Optical isolators (optical couplers) isolate the input and output terminals using optical signals, preventing high voltage or noise signals from entering the device. This protects low-voltage DC signal interference monitoring devices from high-voltage interference, improving device stability.

[0048] In some embodiments, the DC signal interference event monitoring device further includes a power supply module for supplying power to the signal coupling module, interference detection module, and source tracing module via a wide-voltage DC-DC converter.

[0049] Wide-voltage DC-DC converters support a wide range of input voltages, enabling them to handle power supply requirements under varying voltage conditions. They convert input voltages of different ranges into a stable output voltage, ensuring a stable power supply. This allows the device to operate under unstable power conditions, reducing malfunctions caused by voltage fluctuations. Simultaneously, wide-voltage DC-DC converters can more efficiently convert electrical energy from one voltage to another, reducing energy waste and improving power supply efficiency.

[0050] Figure 3 This is a schematic diagram of a DC signal interference event monitoring device and its application environment according to an embodiment of this application, as shown below. Figure 3 As shown, the interference event monitoring device is connected in series to the DC signal circuit of the valve, equipment, and controlled equipment. The interference event monitoring device includes a signal coupling module, an interference monitoring module, a source tracing module, a power supply module, and a communication interface.

[0051] In some embodiments, the device further includes: The signal analysis module, communicatively connected to the signal coupling module, pre-stores an interference type feature database based on historical data. This database includes standard signal features corresponding to different interference source types. The signal analysis module extracts features from the AC signal, obtains signal features, matches these features with the interference type feature database, and outputs a preliminary diagnostic conclusion regarding the interference type based on the matching results.

[0052] The tracing module is also used to match the time data with the equipment logs corresponding to the DC signal circuit, and in conjunction with the preliminary diagnostic conclusions, to determine the interference source that caused the interference event.

[0053] The AC signal extracted by the signal coupling module is converted into a digital signal, which is then analyzed. Optionally, the time-domain signal is converted into the frequency domain using Fourier transform (FFT) to obtain spectral characteristics. In addition, waveform shape, duration, and damped oscillation modes can also be analyzed.

[0054] Construct an interference type feature database: Store the typical signal features (spectral diagram, waveform envelope, etc.) of known interference sources (such as "poor grounding", "relay spark", "frequency converter harmonics", "switching power supply ripple") as "fingerprints" in the database.

[0055] When a new interference event occurs, the device calculates its signal characteristics in real time and performs pattern matching with the "fingerprints" in the database. If the match degree with a certain interference type in the database is greater than the pre-screening match threshold or the highest match degree, a diagnostic conclusion is output, such as "The characteristics of this interference match the characteristics of 'ground loop interference'".

[0056] The system employs a dual-dimensional tracing logic of "time correlation matching + preliminary diagnostic conclusions": using the time data of the interference event as the anchor point, it correlates the operation logs of the DC circuit-related equipment, and combines the identified interference type to narrow down the tracing scope, directly pinpointing the specific interference source, thus solving the industry pain point of "difficult and slow tracing" of DC interference.

[0057] It should be noted that the above modules can be functional modules or program modules, and can be implemented through software or hardware. For modules implemented through hardware, the above modules can reside in the same processor; or the above modules can be located in different processors in any combination.

[0058] This embodiment provides a method for monitoring DC signal interference events. Figure 4 This is a flowchart of a DC signal interference event monitoring method according to an embodiment of this application, such as... Figure 4 As shown, the process includes the following steps: Step S401: Connect the DC signal circuit in series and extract the AC signal from the DC signal circuit.

[0059] Step S402: Based on the AC signal and signal threshold, monitor interference events, and if interference events are detected, record the time data of the interference events.

[0060] Step S403: Match the time data with the equipment logs corresponding to the DC signal loop, and determine the source of interference based on the matching results.

[0061] In some embodiments, monitoring interference events based on the AC signal and a signal threshold includes: Amplify the AC signal to obtain the amplified signal.

[0062] The amplified signal is compared with the signal threshold to determine whether an interference event has occurred. If so, a trigger signal is output.

[0063] In some embodiments, comparing the amplified signal with a signal threshold to determine whether an interference event has occurred includes: When the control signal current value of the DC signal circuit is not fixed, a dynamic signal threshold is obtained based on the control signal. Based on the dynamic signal threshold and the amplified signal, it is determined whether an interference event has occurred.

[0064] With the control signal current value of the DC signal circuit fixed, the system determines whether an interference event has occurred based on a preset fixed signal threshold and an amplified signal.

[0065] In some embodiments, upon detecting an interference event, recording the time data of the interference event includes: Upon receiving a trigger signal, the start time and duration of the interference event are recorded based on the real-time clock chip.

[0066] In some embodiments, matching time data with the device logs corresponding to the DC signal loop, and determining the interference source based on the matching results, includes: Obtain the device startup command and device trip command from the device log, as well as the actual startup time and actual trip time of the device.

[0067] Based on the equipment start command, equipment trip command, actual start time, actual trip time, and time data of the interference event, determine whether the interference event is caused by signal interference that leads to equipment malfunction or tripping.

[0068] In some embodiments, the method further includes isolating the signal input and signal output terminals using an optocoupler isolator.

[0069] In some embodiments, the method further includes: powering the signal coupling module, interference detection module, and source tracing module via a wide-voltage DC-DC converter.

[0070] In some embodiments, the method further includes: The signal analysis module extracts features from the AC signal to obtain signal features, matches the signal features with the interference type feature database, and outputs a preliminary diagnostic conclusion on the interference type based on the matching result. The signal analysis module is communicatively connected to the signal coupling module and has a pre-stored interference type feature database based on historical data. The interference type feature database includes standard signal features corresponding to different interference source types.

[0071] The time data is matched with the device logs corresponding to the DC signal loop, and combined with the preliminary diagnostic conclusions, the source of interference causing the interference event is determined.

[0072] Through the above steps, a DC signal loop is connected in series, and the AC signal in the DC signal loop is extracted. Interference events are monitored based on the AC signal and signal thresholds. When interference events are detected, the time data of the interference events is recorded. This time data is matched with the corresponding equipment logs of the DC signal loop, and the interference source is determined based on the matching results. This solves the problem of tracing the source of DC signal interference events. For the problem of capturing intermittent interference in industrial settings, a lightweight solution is provided. By matching the time data of interference events with equipment logs, the interference source can be quickly located, assisting production technicians in locating the cause of equipment malfunctions. Series connection does not interfere with the original signal and requires no modification to the control system program, making it suitable for large-scale deployment.

[0073] It should be noted that the steps shown in the above process or in the flowchart of the accompanying figures can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0074] This embodiment also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.

[0075] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0076] Optionally, in this embodiment, the processor can be configured to perform the following steps via a computer program: S1 is connected in series to the DC signal circuit to extract the AC signal from the DC signal circuit.

[0077] S2 monitors interference events based on the AC signal and signal threshold, and records the time data of the interference event when it is detected.

[0078] S3 matches the time data with the equipment logs corresponding to the DC signal loop, and determines the source of interference based on the matching results.

[0079] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0080] In one embodiment, Figure 5 This is a schematic diagram of the internal structure of an electronic device according to an embodiment of this application, such as... Figure 5 As shown, an electronic device is provided, which can be a server, and its internal structure diagram can be as follows. Figure 5 As shown, the electronic device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores data. The network interface communicates with external terminals via a network connection. When the computer program is executed by the processor, it implements a method for monitoring DC signal interference events.

[0081] Those skilled in the art will understand that Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0082] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0083] Those skilled in the art should understand that the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A DC signal interference event monitoring device, characterized in that, The device includes: A signal coupling module is used to connect in series to a DC signal circuit and extract the AC signal from the DC signal circuit. An interference detection module is used to monitor interference events based on the AC signal and a signal threshold, and to record the time data of the interference events when they are detected. The source tracing module is used to match the time data with the equipment logs corresponding to the DC signal circuit, and determine the source of interference based on the matching results.

2. The apparatus according to claim 1, characterized in that, The interference detection module includes: A differential amplifier circuit is used to amplify the AC signal to obtain an amplified signal; A threshold comparator is used to compare the amplified signal with the signal threshold to determine whether an interference event has occurred. If so, a trigger signal is output.

3. The apparatus according to claim 2, characterized in that, The threshold comparator includes: A dynamic threshold comparator is used to determine whether an interference event has occurred when the control signal current value of the DC signal loop is not fixed, based on the control signal to obtain a dynamic signal threshold, and based on the dynamic signal threshold and the amplified signal; and / or A fixed threshold comparator is used to determine whether an interference event has occurred based on a preset fixed signal threshold and the amplified signal, when the control signal current value of the DC signal circuit is fixed.

4. The apparatus according to claim 2, characterized in that, The interference detection module also includes a time recording module. The time recording module is communicatively connected to the threshold comparator and is used to record the start time and duration of the interference event based on the real-time clock chip when a trigger signal is received from the threshold comparator.

5. The apparatus according to claim 1, characterized in that, The tracing module includes: The data acquisition module is used to acquire the device startup command and device trip command from the device log, as well as the actual startup time and actual trip time of the device. The analysis module is used to determine whether the interference event is caused by signal interference that causes the equipment to malfunction or trip, based on the equipment start command, the equipment trip command, the actual start time, the actual trip time, and the time data of the interference event.

6. The apparatus according to claim 1, characterized in that, The device further includes an optocoupler isolator for isolating the signal input terminal and the signal output terminal.

7. The apparatus according to claim 1, characterized in that, The device further includes a power supply module for supplying power to the signal coupling module, the interference detection module, and the source tracing module via a wide-voltage DC-DC converter.

8. The apparatus according to claim 1, characterized in that, The device further includes: The signal analysis module is communicatively connected to the signal coupling module and has a pre-stored interference type feature database based on historical data. The interference type feature database includes standard signal features corresponding to different interference source types. The signal analysis module is used to extract features from the AC signal to obtain signal features, match the signal features with the interference type feature database, and output a preliminary diagnostic conclusion on the interference type based on the matching result. The tracing module is also used to match the time data with the equipment logs corresponding to the DC signal circuit, and in conjunction with the preliminary diagnostic conclusions, to determine the interference source that caused the interference event.

9. A method for monitoring DC signal interference events, characterized in that, The method includes: The signal is connected in series to a DC signal circuit, and the AC signal in the DC signal circuit is extracted. Based on the AC signal and signal threshold, monitor interference events, and if the interference event is detected, record the time data of the interference event; The time data is matched with the device logs corresponding to the DC signal loop, and the source of interference is determined based on the matching results.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the DC signal interference event monitoring method as described in claim 8.

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