Electrical safety early warning and monitoring device

By designing an electrical safety early warning and monitoring device, the leakage current of electrical equipment is detected in real time and converted into a stable voltage value. Combined with an alarm module and a communication module, the problem of the strong concealment of electrical equipment leakage is solved, and timely warning and safety monitoring are realized.

CN224095984UActive Publication Date: 2026-04-07YANTAI RUNCHENG SAFETY TECHNOLOGY CONSULTING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-26
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

In existing technologies, electrical equipment leakage is often difficult to detect and lacks timely warnings, posing a safety hazard.

Method used

An electrical safety early warning and monitoring device was designed, including an MCU microcontroller, a leakage current detection module, a human-machine interface module, a communication module, and an alarm module. The leakage current detection module captures AC leakage current in real time, performs current-to-voltage conversion, filtering, and amplification, and combines analog-to-digital conversion to generate a stable real-time leakage voltage value. Alarm information is pushed through the human-machine interface and the communication module.

Benefits of technology

It improves the accuracy of leakage current detection and the timeliness of alarms, ensures the safe operation of electrical equipment, reduces noise interference, enhances communication capabilities, and improves the safety of electrical equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of early warning and monitoring, and particularly relates to an electrical safety early warning and monitoring device, comprising an MCU microcontroller which is connected with a leakage current detection module, a man-machine interaction module, a communication module and an alarm module. The input end of the leakage current detection module is connected to the neutral point of the three-phase power supply and the shell of the electrical equipment, the alternating current leakage current of the shell of the equipment is captured in real time, and the detected alternating current leakage current is converted, filtered and amplified to obtain a stable real-time leakage voltage value, so that the detection accuracy is improved, and the detection efficiency is improved. The alarm accuracy is ensured; then, based on the obtained real-time leakage voltage value and a voltage threshold range preset through a man-machine exchange interface, a field alarm module is controlled to give an alarm, alarm information is generated, and the alarm information and the real-time leakage voltage value are pushed to an external data terminal through a communication module, so that the leakage phenomenon can be found in time, dangers are avoided, and the safety of a user is improved. And safe operation of electrical equipment is ensured.
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Description

Technical Field

[0001] This utility model belongs to the field of early warning and monitoring technology, and specifically relates to an electrical safety early warning and monitoring device. Background Technology

[0002] Electrical leakage refers to the leakage of current in electrical equipment or lines due to damage, aging, or dampness in the insulation. Leakage can cause electrical malfunctions and safety hazards, such as electric shock and fire.

[0003] In real life, the leakage of electrical components is often concealed, and timely warnings are rarely given. Summary of the Invention

[0004] In order to solve the technical problems existing in the background art, the present invention provides an electrical safety early warning and monitoring device, which helps to observe the surrounding environment from multiple different angles, thereby improving the perception of the surrounding environment and avoiding danger to a certain extent.

[0005] To achieve the above technical solution, this utility model provides an electrical safety early warning and monitoring device, including: an MCU microcontroller, a leakage current detection module, a human-machine interaction module, a communication module, and an alarm module;

[0006] The leakage current detection module includes a function to acquire AC leakage current signals and process and convert the acquired AC leakage current signals into stable DC leakage voltage signals.

[0007] The leakage current detection module includes two input terminals and one output terminal. One input terminal is connected to the neutral point of the power supply system of the electrical equipment; the other input terminal is connected to the housing of the electrical equipment; and the output terminal is connected to the MCU microcontroller.

[0008] The leakage current detection module includes: a leakage current signal acquisition and conversion unit, an AC / DC conversion unit, a differential amplification unit, and an A / D conversion unit connected in sequence;

[0009] The leakage current signal acquisition and conversion unit is used to acquire the AC leakage current of the detection equipment and convert the acquired AC leakage current signal into an AC leakage voltage signal.

[0010] AC / DC conversion unit is used to convert the converted AC leakage voltage signal into a DC leakage voltage signal;

[0011] The differential amplifier unit is used to filter and amplify the DC leakage voltage signal to obtain a stable DC leakage voltage signal.

[0012] The A / D conversion unit is used to convert the filtered and amplified DC leakage voltage signal into an analog-to-digital value to obtain the DC leakage voltage value.

[0013] The human-machine interface is connected to the MCU controller and is used to preset the voltage threshold range for the MCU microcontroller, as well as to display the DC leakage voltage value;

[0014] The alarm module is connected to the MCU controller to control the alarm module to trigger an alarm.

[0015] The communication module connects to the MCU controller via a serial port to enable bidirectional communication with external devices.

[0016] Furthermore, the leakage current signal acquisition and conversion unit includes a first input terminal Uin1 and a second input terminal Uin2; the first input terminal Uin1 is connected to the first end of the fourth resistor R4, the first end of the first capacitor C1, and the first end of the second resistor R2; the second input terminal Uin2 is connected to the second end of the fourth resistor R4, the second end of the first capacitor C1, and the first end of the first resistor R1; the second end of the second resistor R2 is connected to the positive input terminal of the operational amplifier A1; the second end of the first resistor R1 is connected to the negative input terminal of the operational amplifier A1 and the first end of the third resistor R3; the output terminal of the operational amplifier A1 is connected to the first end of the fifth resistor R5; the second end of the third resistor R3 is connected to the second end of the fifth resistor R5 through a variable resistor R6 and then connected to the output terminal Port0 of the leakage current signal acquisition and conversion unit.

[0017] Further, the AC / DC conversion unit includes: an operational amplifier A2, the positive input terminal of which is connected to the first terminal of the seventh resistor R7 via a leakage current signal acquisition and conversion unit output terminal Port0; the second terminal of the seventh resistor R7 is grounded; the positive input terminal of the operational amplifier A2 is connected to the first terminals of the eighth resistor R8 and the ninth resistor R9; the second terminal of the eighth resistor R8 is grounded through the second capacitor C2; the output terminal of the operational amplifier A2 is connected to the second terminal of the ninth resistor R9 and the first terminal of the third capacitor C3; the second terminal of the third capacitor C3 is connected to the first terminal of the eleventh resistor R11 and the first terminal of the tenth resistor R10; the second terminal of the tenth resistor R10 is connected to the first terminal of the twelfth resistor R12 and the operational amplifier... The negative input terminal of operational amplifier A3 is connected; the positive input terminal of operational amplifier A3 is grounded; the output terminal of operational amplifier A3 is connected to the second terminal of the twelfth resistor R12 and the first terminal of the thirteenth resistor R13 via the reverse diode D1; the output terminal of operational amplifier A3 is also connected to the negative input terminal of operational amplifier A3 via the forward diode D2; the second terminal of the thirteenth resistor R13 is connected to the second terminal of the eleventh resistor R11, the first terminal of the fourteenth resistor R14, the first terminal of the fourth capacitor C4, and the negative input terminal of operational amplifier A4; the positive input terminal of operational amplifier A4 is grounded; the output terminal of operational amplifier A4 is connected to the second terminal of the fourteenth resistor R14, the second terminal of the fourth capacitor C4, and the output terminal Port1 of the AC / DC conversion unit.

[0018] Further, the differential amplifier unit includes: a fifteenth resistor R15 and a seventeenth resistor R17. The first ends of the fifteenth resistor R15 and the seventeenth resistor R17 are connected to the output port 1 of the AC / DC conversion unit. The second end of the fifteenth resistor R15 is connected to the first end of the sixteenth resistor R16 and the positive input terminal of the operational amplifier A6. The second end of the sixteenth resistor R16 is grounded. The second end of the seventeenth resistor R17 is grounded through a variable resistor R18 and connected to the positive input terminal of the operational amplifier A5. The negative input terminal of the operational amplifier A5 is connected to the first end of the twentieth resistor R20 and the first end of the twenty-first resistor R21. The negative input terminal of the operational amplifier A6 is connected to the twenty-first resistor R21. The second terminal of the 20th resistor R20 and the first terminal of the 19th resistor R19 are connected; the output terminal of the operational amplifier A5 is connected to the second terminal of the 20th resistor R20 and the first terminal of the 19th resistor R19; the second terminal of the 19th resistor R19 and the first terminal of the 25th resistor R25 are connected to the negative input terminal of the operational amplifier A7; the output terminal of the operational amplifier A6 is connected to the second terminal of the 22nd resistor R22 and the first terminal of the 23rd resistor R23; the positive input terminal of the operational amplifier A7 is connected to the second terminal of the 23rd resistor R23 and the first terminal of the 24th resistor R24; the second terminal of the 24th resistor R24 ​​is grounded; the output terminal of the operational amplifier A7 is connected to the second terminal of the 25th resistor R25 and the output terminal of the differential amplifier unit.

[0019] Furthermore, the alarm module includes a twenty-sixth resistor R26, the first end of which is connected to the MCU microcontroller; the second end of the twenty-sixth resistor R26 is connected to the first end of the twenty-seventh resistor R27 and the anode of the fourth diode D4; the cathode of the fourth diode D4 is connected to the base of the transistor Q1; the collector of the transistor Q1 is connected to the anode of the third diode D3 and the cathode of the alarm BUZZER; the emitter of the transistor Q1 and the second end of the twenty-seventh resistor R27 are grounded; and the cathode of the third diode D3 and the anode of the alarm BUZZER are connected to the power supply VCC1.

[0020] Furthermore, the MCU microcontroller adopts an STM32 series microcontroller.

[0021] Furthermore, the communication module includes an RS485 communication module and a 4G communication module; both the RS485 communication module and the 4G communication module are connected to the USAR interface of the STM32 series microcontroller.

[0022] The beneficial effects of this utility model are:

[0023] The electrical safety early warning and monitoring device provided by this utility model connects the leakage current detection terminal (i.e., the input terminal) to the neutral point of a three-phase power supply and the casing. It captures the AC leakage current of the equipment casing in real time and performs current-to-voltage conversion, AC-to-DC conversion, filtering and amplification of the converted DC voltage signal, and analog-to-digital conversion on the filtered and amplified DC voltage signal to obtain a stable real-time leakage voltage value. This helps to improve the accuracy of detection and ensure the accuracy of alarms. Then, based on the obtained real-time leakage voltage value and the voltage threshold range preset through the human-machine interface, the device controls the on-site alarm module to trigger an alarm and generate alarm information. The alarm information and the real-time leakage voltage value are pushed to an external data terminal through the communication module, which helps to detect leakage phenomena in a timely manner, avoid danger, and ensure the safe operation of electrical equipment.

[0024] (2) The differential amplifier unit in this utility model amplifies and filters the DC leakage voltage signal through a two-stage amplification and filtering current, which helps to reduce noise and improve the accuracy of detection.

[0025] (3) The alarm module increases the conduction voltage of transistor Q1 by setting a forward diode on the base of transistor Q1, thereby ensuring that transistor Q1 is completely cut off when the MUC microcontroller outputs a low level. A diode is set in parallel with the alarm BUZZER so that when transistor Q1 is turned off, the coil in the buzzer will generate a high reverse electromotive force. The diode can provide a freewheeling path and clamp the reverse electromotive force to prevent the transistor from breaking down, thereby improving the accuracy and safety of the alarm module.

[0026] (4) The communication module adopts two communication methods: 4G communication module and RS485 communication module, which helps to improve communication capabilities.

[0027] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0029] Figure 1 This is an electrical schematic diagram of an electrical safety early warning monitoring device in one embodiment;

[0030] Figure 2 This is a circuit diagram of the leakage current signal acquisition and conversion unit of an electrical safety early warning monitoring device in one embodiment;

[0031] Figure 3 This is a circuit diagram of the AC / DC conversion unit of an electrical safety early warning monitoring device in one embodiment;

[0032] Figure 4 This is a circuit diagram of the differential amplifier unit of an electrical safety early warning monitoring device in one embodiment;

[0033] Figure 5 This is a circuit diagram of the alarm module of an electrical safety early warning monitoring device in one embodiment.

[0034] 1-MCU microcontroller; 2-Leakage current detection module; 3-Human-machine interface module; 4-Alarm module; 5-Communication module. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, each technical and scientific term used in this embodiment has the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0039] In this utility model, terms such as "fixed connection," "connected," and "joined" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For researchers or maintenance personnel in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0040] Example 1:

[0041] This embodiment provides an electrical safety early warning and monitoring device, such as... Figure 1 As shown, it includes: MCU microcontroller 1, which is connected to leakage current detection module 2, human-machine interaction module 3, communication module 5 and alarm module 4.

[0042] The leakage current detection module includes a function to acquire AC leakage current signals and process and convert the acquired AC leakage current signals into stable DC leakage voltage signals, thereby improving the accuracy of detection.

[0043] The leakage current detection module includes two input terminals and one output terminal. One input terminal is connected to the neutral point of the power supply system of the electrical equipment; the other input terminal is connected to the housing of the electrical equipment; and the output terminal is connected to the MCU microcontroller via the SPI interface.

[0044] The leakage current detection module includes: a leakage current signal acquisition and conversion unit, an AC / DC conversion unit, a differential amplification unit, and an A / D conversion unit.

[0045] The input terminal of the leakage current signal acquisition and conversion unit is connected to the input terminal of the leakage current detection module. It is used to acquire the AC leakage current of the detection equipment and convert the acquired AC leakage current signal into an AC leakage voltage signal.

[0046] The output of the leakage current signal acquisition and conversion unit is connected to the input of the AC / DC conversion unit so that the AC leakage voltage signal is converted into a DC leakage voltage signal through the AC / DC conversion unit.

[0047] The output of the AC / DC conversion unit is connected to the input of the differential amplifier unit so that the DC leakage voltage signal can be filtered and amplified by the differential amplifier unit to reduce noise and obtain a stable DC leakage voltage signal, thereby helping to improve detection accuracy.

[0048] The output of the differential amplifier unit is connected to the input of the A / D conversion unit so that the filtered and amplified DC leakage voltage signal can be converted from analog to digital by the A / D conversion unit to obtain the DC leakage voltage value.

[0049] The output of the A / D conversion unit is connected to the MCU controller via an SPI interface to send the obtained DC leakage voltage value to the MCU microcontroller.

[0050] The human-machine interface is connected to the MCU controller and is used to preset the voltage threshold range for the MCU microcontroller. It is also used to display the DC leakage voltage value received by the MCU microcontroller for staff to view.

[0051] The alarm module is connected to the MCU controller to control the alarm module to sound an alarm; specifically, when the DC leakage voltage value received by the MCU microcontroller is not within the preset voltage threshold range, the alarm module is controlled to sound an alarm.

[0052] The communication module connects to the MCU controller via a serial port to enable bidirectional communication with external devices.

[0053] External devices include, but are not limited to: host computers, portable terminals, and staff mobile phones.

[0054] like Figure 2 As shown, the leakage current signal acquisition and conversion unit includes a first input terminal Uin1 and a second input terminal Uin2; the first input terminal Uin1 is connected to the first end of the fourth resistor R4, the first end of the first capacitor C1, and the first end of the second resistor R2; the second input terminal Uin2 is connected to the second end of the fourth resistor R4, the second end of the first capacitor C1, and the first end of the first resistor R1; the second end of the second resistor R2 is connected to the positive input terminal of the operational amplifier A1; the second end of the first resistor R1 is connected to the negative input terminal of the operational amplifier A1 and the first end of the third resistor R3; the output terminal of the operational amplifier A1 is connected to the first end of the fifth resistor R5; the second end of the third resistor R3 is connected to the second end of the fifth resistor R5 through a variable resistor R6, and then connected to the output terminal Port0 of the leakage current signal acquisition and conversion unit.

[0055] Among them, the fourth resistor R4 is a PT1000 platinum resistor with high precision and good thermal stability. The first input terminal Uin1 is connected to the neutral point of the power supply system of the electrical equipment; the second input terminal Uin2 is connected to the housing of the electrical equipment.

[0056] like Figure 3As shown, the AC / DC conversion unit includes: operational amplifier A2, the positive input terminal of operational amplifier A2 is connected to the first terminal of the seventh resistor R7 via leakage current signal acquisition and conversion unit output terminal Port0; the second terminal of the seventh resistor R7 is grounded; the positive input terminal of operational amplifier A2 is connected to the first terminal of the eighth resistor R8 and the first terminal of the ninth resistor R9; the second terminal of the eighth resistor R8 is grounded through the second capacitor C2; the output terminal of operational amplifier A2 is connected to the second terminal of the ninth resistor R9 and the first terminal of the third capacitor C3; the second terminal of the third capacitor C3 is connected to the first terminal of the eleventh resistor R11 and the first terminal of the tenth resistor R10; the second terminal of the tenth resistor R10 is connected to the first terminal of the twelfth resistor R12 and the operational amplifier A2... The negative input terminal of operational amplifier A3 is connected; the positive input terminal of operational amplifier A3 is grounded; the output terminal of operational amplifier A3 is connected to the second terminal of the twelfth resistor R12 and the first terminal of the thirteenth resistor R13 via the reverse diode D1; the output terminal of operational amplifier A3 is also connected to the negative input terminal of operational amplifier A3 via the forward diode D2; the second terminal of the thirteenth resistor R13 is connected to the second terminal of the eleventh resistor R11, the first terminal of the fourteenth resistor R14, the first terminal of the fourth capacitor C4, and the negative input terminal of operational amplifier A4; the positive input terminal of operational amplifier A4 is grounded; the output terminal of operational amplifier A4 is connected to the second terminal of the fourteenth resistor R14, the second terminal of the fourth capacitor C4, and the output terminal Port1 of the AC / DC conversion unit.

[0057] like Figure 4As shown, the differential amplifier unit includes: a fifteenth resistor R15 and a seventeenth resistor R17. The first terminals of the fifteenth resistor R15 and the seventeenth resistor R17 are connected to the output terminal Port1 of the AC / DC conversion unit. The second terminal of the fifteenth resistor R15 is connected to the first terminal of the sixteenth resistor R16 and the positive input terminal of operational amplifier A6. The second terminal of the sixteenth resistor R16 is grounded. The second terminal of the seventeenth resistor R17 is grounded through a variable resistor R18 and connected to the positive input terminal of operational amplifier A5. The negative input terminal of operational amplifier A5 is connected to the first terminal of the twentieth resistor R20 and the first terminal of the twenty-first resistor R21. The negative input terminal of operational amplifier A6 is connected to the first terminal of the twenty-first resistor R21. The second terminal of the 22nd resistor R22 is connected to the first terminal of the 20th resistor R20 and the first terminal of the 19th resistor R19. The second terminal of the 19th resistor R19 and the first terminal of the 25th resistor R25 are connected to the negative input terminal of the operational amplifier A7. The output terminal of the operational amplifier A6 is connected to the second terminal of the 22nd resistor R22 and the first terminal of the 23rd resistor R23. The positive input terminal of the operational amplifier A7 is connected to the second terminal of the 23rd resistor R23 and the first terminal of the 24th resistor R24. The second terminal of the 24th resistor R24 ​​is grounded. The output terminal of the operational amplifier A7 is connected to the second terminal of the 25th resistor R25 and the output terminal of the differential amplifier unit.

[0058] In this differential amplifier unit, operational amplifiers A5 and A6 and their surrounding circuitry perform the first stage of amplification, while operational amplifier A7 and its surrounding circuitry perform the second stage of amplification. This two-stage amplification helps reduce noise and improve the accuracy of detection.

[0059] In this embodiment, the AC leakage current signal of the detection device is collected by the leakage current detection module. The collected AC leakage current signal is processed and converted into a stable DC leakage voltage signal, thereby improving the accuracy of detection. The converted DC leakage voltage signal is then converted from analog to digital to obtain the DC leakage voltage value, which is sent to the MCU microcontroller. The MCU microcontroller displays the value through a human-machine interface and sends it to the monitoring device through the communication module. Simultaneously, the DC voltage value is compared with a preset voltage threshold range through the human-machine interface. When the DC leakage voltage value exceeds the preset voltage threshold range, the alarm module is activated to sound an alarm and sends an alarm message to the monitoring device through the communication module.

[0060] This embodiment converts the detected AC leakage current into a stable DC leakage voltage value, which helps improve the accuracy of detection. Furthermore, by comparing the obtained stable DC leakage voltage value with a preset voltage threshold range, the alarm device is controlled to trigger an alarm, and the alarm information is sent through the communication module. This not only helps improve the detection accuracy of the device but also helps to avoid danger.

[0061] Example 2:

[0062] In one embodiment, such as Figure 5 As shown, the alarm module includes: a 26th resistor R26, the first end of which is connected to the MCU microcontroller; the second end of the 26th resistor R26 is connected to the first end of the 27th resistor R27 and the anode of the fourth diode D4; the cathode of the fourth diode D4 is connected to the base of transistor Q1; the collector of transistor Q1 is connected to the anode of the third diode D3 and the cathode of the alarm BUZZER; the emitter of transistor Q1 and the second end of the 27th resistor R27 are grounded; the cathode of the third diode D3 and the anode of the alarm BUZZER are connected to the power supply VCC1. The third diode is a Schottky diode to ensure a fast response.

[0063] In this embodiment, a forward diode is placed on the base of transistor Q1 to increase the conduction voltage of transistor Q1, thereby ensuring that transistor Q1 is completely cut off when the MUC microcontroller is outputting a low level. A diode is also placed in parallel with the buzzer so that when transistor Q1 is turned off, the coil inside the buzzer will generate a high reverse electromotive force. The diode can provide a freewheeling path and clamp the reverse electromotive force to prevent the transistor from breaking down.

[0064] Example 3:

[0065] In one embodiment, the MCU microcontroller adopts an STM32 series microcontroller; the communication module includes an RS485 communication module and a 4G communication module; both the RS485 communication module and the 4G communication module are connected to the USAR interface of the USART microcontroller, so that the MCU microcontroller can connect to the monitoring equipment through the RS485 communication module and / or the 4G communication module.

[0066] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, for the terminal embodiments, since they are basically similar to the method embodiments, the description and comparison are simple, and the relevant parts can be referred to the description in the method embodiments.

[0067] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0068] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrical safety early warning and monitoring device, characterized in that, include: MCU microcontroller, leakage current detection module, human-machine interaction module, communication module, and alarm module; The leakage current detection module includes a function to acquire AC leakage current signals and process and convert the acquired AC leakage current signals into a stable DC leakage voltage signal. The leakage current detection module includes two input terminals and one output terminal. One input terminal is connected to the neutral point of the power supply system of the electrical equipment. The other input is connected to the housing of the electrical equipment, and the output is connected to the MCU microcontroller; The leakage current detection module includes: a leakage current signal acquisition and conversion unit, an AC / DC conversion unit, a differential amplification unit, and an A / D conversion unit connected in sequence; The leakage current signal acquisition and conversion unit is used to acquire the AC leakage current of the detection equipment and convert the acquired AC leakage current signal into an AC leakage voltage signal. AC / DC conversion unit is used to convert the converted AC leakage voltage signal into a DC leakage voltage signal; The differential amplifier unit is used to filter and amplify the DC leakage voltage signal to obtain a stable DC leakage voltage signal. The A / D conversion unit is used to convert the filtered and amplified DC leakage voltage signal into an analog-to-digital signal to obtain the DC leakage voltage value. The human-machine interface is connected to the MCU controller and is used to preset the voltage threshold range for the MCU microcontroller, as well as to display the DC leakage voltage value; The alarm module is connected to the MCU controller to control the alarm module to trigger an alarm. The communication module connects to the MCU controller via a serial port to enable bidirectional communication with external devices.

2. The electrical safety early warning and monitoring device according to claim 1, characterized in that, The leakage current signal acquisition and conversion unit includes a first input terminal Uin1 and a second input terminal Uin2. The first input terminal Uin1 is connected to the first end of the fourth resistor R4, the first end of the first capacitor C1, and the first end of the second resistor R2. The second input terminal Uin2 is connected to the second end of the fourth resistor R4, the second end of the first capacitor C1, and the first end of the first resistor R1. The second end of the second resistor R2 is connected to the positive input terminal of the operational amplifier A1. The second end of the first resistor R1 is connected to the negative input terminal of the operational amplifier A1 and the first end of the third resistor R3. The output terminal of the operational amplifier A1 is connected to the first end of the fifth resistor R5. The second end of the third resistor R3 is connected to the second end of the fifth resistor R5 through a variable resistor R6 and then connected to the output terminal Port0 of the leakage current signal acquisition and conversion unit.

3. The electrical safety early warning and monitoring device according to claim 2, characterized in that, The AC / DC conversion unit includes: an operational amplifier A2, the positive input terminal of which is connected to the first terminal of the seventh resistor R7 via a leakage current signal acquisition and conversion unit output terminal Port0; the second terminal of the seventh resistor R7 is grounded; the positive input terminal of the operational amplifier A2 is connected to the first terminals of the eighth resistor R8 and the ninth resistor R9; the second terminal of the eighth resistor R8 is grounded through the second capacitor C2; the output terminal of the operational amplifier A2 is connected to the second terminal of the ninth resistor R9 and the first terminal of the third capacitor C3; the second terminal of the third capacitor C3 is connected to the first terminal of the eleventh resistor R11 and the first terminal of the tenth resistor R10; the second terminal of the tenth resistor R10 is connected to the first terminal of the twelfth resistor R12 and the operational amplifier A2. The negative input terminal of operational amplifier A3 is connected; the positive input terminal of operational amplifier A3 is grounded; the output terminal of operational amplifier A3 is connected to the second terminal of the twelfth resistor R12 and the first terminal of the thirteenth resistor R13 via the reverse diode D1; the output terminal of operational amplifier A3 is also connected to the negative input terminal of operational amplifier A3 via the forward diode D2; the second terminal of the thirteenth resistor R13 is connected to the second terminal of the eleventh resistor R11, the first terminal of the fourteenth resistor R14, the first terminal of the fourth capacitor C4, and the negative input terminal of operational amplifier A4; the positive input terminal of operational amplifier A4 is grounded; the output terminal of operational amplifier A4 is connected to the second terminal of the fourteenth resistor R14, the second terminal of the fourth capacitor C4, and the output terminal Port1 of the AC / DC conversion unit.

4. The electrical safety early warning and monitoring device according to claim 3, characterized in that, The differential amplifier unit includes: a fifteenth resistor R15 and a seventeenth resistor R17. The first terminals of the fifteenth resistor R15 and the seventeenth resistor R17 are connected to the output terminal Port1 of the AC / DC conversion unit. The second terminal of the fifteenth resistor R15 is connected to the first terminal of the sixteenth resistor R16 and the positive input terminal of operational amplifier A6. The second terminal of the sixteenth resistor R16 is grounded. The second terminal of the seventeenth resistor R17 is grounded through a variable resistor R18 and connected to the positive input terminal of operational amplifier A5. The negative input terminal of operational amplifier A5 is connected to the first terminal of the twentieth resistor R20 and the first terminal of the twenty-first resistor R21. The negative input terminal of operational amplifier A6 is connected to the first terminal of the twenty-first resistor R21. The second terminal of the 22nd resistor R22 is connected to the first terminal of the 20th resistor R20 and the first terminal of the 19th resistor R19. The second terminal of the 19th resistor R19 and the first terminal of the 25th resistor R25 are connected to the negative input terminal of the operational amplifier A7. The output terminal of the operational amplifier A6 is connected to the second terminal of the 22nd resistor R22 and the first terminal of the 23rd resistor R23. The positive input terminal of the operational amplifier A7 is connected to the second terminal of the 23rd resistor R23 and the first terminal of the 24th resistor R24. The second terminal of the 24th resistor R24 ​​is grounded. The output terminal of the operational amplifier A7 is connected to the second terminal of the 25th resistor R25 and the output terminal of the differential amplifier unit.

5. The electrical safety early warning and monitoring device according to claim 1, characterized in that, The alarm module includes a 26th resistor R26. The first end of the 26th resistor R26 is connected to the MCU microcontroller. The second end of the 26th resistor R26 is connected to the first end of the 27th resistor R27 and the anode of the fourth diode D4. The cathode of the fourth diode D4 is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the anode of the third diode D3 and the cathode of the alarm BUZZER. The emitter of the transistor Q1 and the second end of the 27th resistor R27 are grounded. The cathode of the third diode D3 and the anode of the alarm BUZZER are connected to the power supply VCC1.

6. The electrical safety early warning and monitoring device according to claim 1, characterized in that, The MCU microcontroller is an STM32 series microcontroller.

7. The electrical safety early warning and monitoring device according to claim 6, characterized in that, The communication module includes an RS485 communication module and a 4G communication module; both the RS485 communication module and the 4G communication module are connected to the USAR interface of the STM32 series microcontroller.