Electrical safety intelligent monitoring system

Abstract

The utility model relates to the field of electrical safety technology, and proposes an electrical safety intelligent monitoring system, including an ultrasonic sensor, a signal processing circuit, a comparison circuit, a logic judgment circuit, a controller and a wireless communication module; the ultrasonic sensor is used to detect arcs generated during the operation of electrical equipment, the ultrasonic sensor is connected to the input end of the signal processing circuit, the output end of the signal processing circuit is connected to the first end of the comparison circuit, the second end of the comparison circuit is used to connect a first reference voltage, and the second end of the comparison circuit is used to connect a second reference voltage; the fourth end of the comparison circuit is connected to the controller through a logic judgment circuit. Through the above technical solution, the problem of low arc detection accuracy in the related technology is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical safety, and in particular to an electrical safety intelligent monitoring system. Background Art

[0002] Electrical fires are a common type of fire, which often cause serious casualties and property losses. Some electrical faults are often accompanied by the appearance of arcs, and the temperature of arcs can reach 2000°C-3000°C. If the arc is given enough time to accumulate energy, it will ignite the combustible materials at the fault location and cause a fire. Therefore, arc detection is one of the important means to prevent electrical fires. However, existing arc detection technology often has difficulty in accurately distinguishing between current fluctuations under normal working conditions and true arc faults, resulting in a high false alarm rate. Utility Model Content

[0003] The utility model provides an electrical safety intelligent monitoring system, which solves the problem of low arc detection accuracy in related technologies.

[0004] The technical solution of the utility model is as follows:

[0005] Electrical safety intelligent monitoring system, including arc detection module, controller and wireless communication module;

[0006] The arc detection module is used to detect arcs generated during the operation of the electrical equipment, and the arc detection module is connected to the controller;

[0007] The controller is connected to the monitoring terminal through the wireless communication module;

[0008] The arc detection module includes an ultrasonic sensor, a signal processing circuit, a comparison circuit and a logic judgment circuit;

[0009] The ultrasonic sensor is used to detect arcs generated during the operation of electrical equipment, the ultrasonic sensor is connected to the input end of the signal processing circuit, the output end of the signal processing circuit is connected to the first end of the comparison circuit, the second end of the comparison circuit is used to connect to a first reference voltage, and the second end of the comparison circuit is used to connect to a second reference voltage;

[0010] The fourth terminal of the comparison circuit is connected to the controller through the logic judgment circuit.

[0011] Furthermore, the signal processing circuit in the utility model includes an amplifier circuit, a bandpass filter circuit and a rectifier filter circuit;

[0012] The input end of the amplifier circuit is connected to the ultrasonic sensor, the output end of the amplifier circuit is connected to the input end of the bandpass filter circuit, the output end of the bandpass filter circuit is connected to the input end of the rectifier filter circuit, and the output end of the rectifier filter circuit is connected to the first end of the comparison circuit.

[0013] Further, the comparison circuit in the utility model includes a resistor R1, an operational amplifier U1 and an operational amplifier U2;

[0014] The first end of the resistor R1 is connected to the output end of the signal processing circuit, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U1, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U1 is connected to a first reference voltage, the non-inverting input end of the operational amplifier U2 is connected to a second reference voltage, the output end of the operational amplifier U1 is connected to the logic judgment circuit, and the output end of the operational amplifier U2 is connected to the logic judgment circuit.

[0015] Further, the amplifier circuit in the utility model includes a capacitor C3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and an amplifier U6;

[0016] The first end of the capacitor C3 is connected to the ultrasonic sensor, the second end of the capacitor C3 is grounded through the resistor R4, the second end of the capacitor C3 is connected to the first inverting input terminal of the amplifier U6 through the resistor R5, the first non-inverting input terminal of the amplifier U6 is grounded through the resistor R6, the first output terminal of the amplifier U6 is connected to the first inverting input terminal of the amplifier U6 through the resistor R7, the output terminal of the amplifier U6 is connected to the second non-inverting input terminal of the amplifier U6, the second output terminal of the amplifier U6 is connected to the second output terminal of the amplifier U6, and the second output terminal of the amplifier U6 is connected to the band-pass filter circuit.

[0017] Further, the amplifier circuit in the utility model includes a capacitor C3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and an amplifier U6;

[0018] The first end of the capacitor C3 is connected to the ultrasonic sensor, the second end of the capacitor C3 is grounded through the resistor R4, the second end of the capacitor C3 is connected to the first inverting input terminal of the amplifier U6 through the resistor R5, the first non-inverting input terminal of the amplifier U6 is grounded through the resistor R6, the first output terminal of the amplifier U6 is connected to the first inverting input terminal of the amplifier U6 through the resistor R7, the output terminal of the amplifier U6 is connected to the second non-inverting input terminal of the amplifier U6, the second output terminal of the amplifier U6 is connected to the second output terminal of the amplifier U6, and the second output terminal of the amplifier U6 is connected to the band-pass filter circuit.

[0019] Further, the bandpass filter circuit in the utility model includes a resistor R9, a capacitor C7, a capacitor C8, a resistor R10, an operational amplifier U7, a resistor R13, a resistor R12 and a resistor R11;

[0020] The first end of the resistor R9 is connected to the output end of the amplifier circuit, the second end of the resistor R9 is grounded through the capacitor C7, the second end of the resistor R9 is connected to the inverting input end of the operational amplifier U7 through the capacitor C8, the inverting input end of the operational amplifier U7 is grounded through the resistor R10, the non-inverting input end of the operational amplifier U7 is grounded through the resistor R13, the output end of the operational amplifier U7 is connected to the second end of the resistor R9 through the resistor R11, the output end of the operational amplifier U7 is connected to the non-inverting input end of the operational amplifier U7 through the resistor R12, and the output end of the operational amplifier U7 is connected to the rectifier and filter circuit.

[0021] Furthermore, the rectification and filtering circuit in the utility model includes a diode D1, a capacitor C4, a resistor R8 and a capacitor C5;

[0022] The anode of the diode D1 is connected to the output end of the bandpass filter circuit, the cathode of the diode D1 is grounded through the capacitor C4, the cathode of the diode D1 is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded through the capacitor C5, and the second end of the resistor R8 is connected to the first end of the comparison circuit.

[0023] Furthermore, the utility model also includes a temperature detection circuit and a smoke detection circuit;

[0024] The temperature detection circuit and the smoke detection circuit are both connected to the controller.

[0025] The working principle and beneficial effects of the utility model are:

[0026] In the utility model, by integrating ultrasonic sensors and a series of signal processing circuits, the system can accurately capture arc signals generated during the operation of electrical equipment, and accurately compare the comparison circuit with the preset reference voltage. The comparison circuit can accurately distinguish normal current fluctuations from arc fault signals by accurately comparing with the preset first reference voltage and second reference voltage, greatly reducing the false alarm rate. The logic judgment circuit performs logical analysis and judgment based on the output result of the comparison circuit, ensuring that an alarm signal is sent to the controller only when the arc signal exceeds the preset threshold. This multi-level detection and processing mechanism greatly improves the accuracy and reliability of arc detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Figure 1 It is a structural block diagram of the electrical safety intelligent monitoring system in the utility model;

[0029] Figure 2 This is a circuit diagram of an embodiment of an intelligent electrical safety monitoring system in the utility model. DETAILED DESCRIPTION

[0030] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0031] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment proposes an electrical safety intelligent monitoring system, including an arc detection module, a controller and a wireless communication module;

[0034] The arc detection module is used to detect arcs generated during the operation of electrical equipment, and the arc detection module is connected to the controller;

[0035] The controller is connected to the monitoring terminal through the wireless communication module;

[0036] The arc detection module includes an ultrasonic sensor, a signal processing circuit, a comparison circuit and a logic judgment circuit;

[0037] The ultrasonic sensor is used to detect arcs generated during the operation of electrical equipment. The ultrasonic sensor is connected to the input end of the signal processing circuit, the output end of the signal processing circuit is connected to the first end of the comparison circuit, the second end of the comparison circuit is used to connect to the first reference voltage, and the second end of the comparison circuit is used to connect to the second reference voltage;

[0038] The fourth terminal of the comparison circuit is connected to the controller through the logic judgment circuit.

[0039] In this embodiment, when a short circuit or ground fault occurs, an arc is generated due to electrical discharge, and the arc emits 25-45 kHz ultrasonic waves. Therefore, this embodiment can use ultrasound to detect the discharge arc.

[0040] In this embodiment, the electrical safety intelligent monitoring system detects arcs generated during the operation of electrical equipment through its arc detection module. The core part of the arc detection module is the ultrasonic sensor, which has the ability to perform non-contact and wear-free detection of arcs during the operation of electrical equipment. Since ultrasound has the characteristics of high frequency, short wavelength, and good directionality, it can effectively penetrate electrical equipment and accurately detect the generated arcs.

[0041] When the ultrasonic sensor detects an arc, it converts the detected ultrasonic signal into a corresponding electrical signal and transmits it to the input end of the signal processing circuit. The main function of the signal processing circuit is to pre-process the signal from the ultrasonic sensor, such as filtering and amplification, to improve the reliability and accuracy of the signal. The processed signal is then transmitted to the first end of the comparison circuit.

[0042] The comparison circuit plays a key role here. It receives the output signal from the signal processing circuit and compares it with the preset first reference voltage and second reference voltage. The two reference voltages are set according to the system's sensitivity requirements to arcs and the actual working environment. Through the comparison of the comparison circuit, it can be determined whether the detected signal exceeds the preset threshold, thereby further determining whether there is an arc.

[0043] The output result of the comparison circuit is transmitted to the logic judgment circuit. The logic judgment circuit makes a logic judgment based on the output signal of the comparison circuit to determine whether a signal indicating the existence of an arc should be sent to the controller. If the logic judgment circuit determines that an arc exists, it will send a corresponding signal to the controller.

[0044] After receiving the signal from the logic judgment circuit, the controller will perform further processing. It will determine whether to initiate corresponding protection measures, such as cutting off the power supply or reducing the voltage, based on the received signal and the system's preset rules and algorithms. At the same time, the controller will also send relevant information to the monitoring terminal through the wireless communication module so that users can promptly understand the operating status of the electrical equipment and whether there are safety hazards such as arcs.

[0045] As an important part of the system, the wireless communication module is responsible for transmitting the information sent by the controller to the monitoring terminal. It can convert the received electromagnetic wave signals into information that the user can understand, and realize the remote transmission and monitoring of information. In this way, the user can understand the operating status of the electrical equipment in real time through the monitoring terminal, and take corresponding measures in time to ensure electrical safety.

[0046] It can be concluded that by integrating ultrasonic sensors and a series of signal processing circuits, the system can accurately capture arc signals generated during the operation of electrical equipment, and accurately compare the comparison circuit with the preset reference voltage. The comparison circuit can accurately distinguish normal current fluctuations from arc fault signals by accurately comparing with the preset first reference voltage and second reference voltage, greatly reducing the false alarm rate. The logic judgment circuit performs logical analysis and judgment based on the output results of the comparison circuit, ensuring that an alarm signal is sent to the controller only when the arc signal exceeds the preset threshold. This multi-level detection and processing mechanism greatly improves the accuracy and reliability of arc detection.

[0047] like Figure 1 As shown, the signal processing circuit in this embodiment includes an amplifier circuit, a bandpass filter circuit and a rectifier filter circuit; the input end of the amplifier circuit is connected to the ultrasonic sensor, the output end of the amplifier circuit is connected to the input end of the bandpass filter circuit, the output end of the bandpass filter circuit is connected to the input end of the rectifier filter circuit, and the output end of the rectifier filter circuit is connected to the first end of the comparison circuit.

[0048] In this embodiment, the purpose of the signal processing circuit is to improve the accuracy and reliability of arc detection.

[0049] Among them, the amplifier circuit is the first step of signal processing, and the amplifier circuit is directly connected to the output of the ultrasonic sensor. The weak electrical signals detected by the ultrasonic sensor may be very small due to distance attenuation, environmental interference and other reasons. The role of the amplifier circuit is to amplify these signals to a level that is easier to process. This can improve the signal-to-noise ratio, so that the subsequent processing links can more clearly identify useful signal features. The amplified signal usually contains a wide frequency range, which includes both specific frequency components generated by the arc and a large amount of unwanted noise. The purpose of the bandpass filter circuit is to allow only signals within a specific frequency range to pass through, while filtering out the remaining frequency components. In arc detection, the bandpass filter circuit is usually set to only pass the ultrasonic frequency band unique to the arc generation, so as to focus on the arc-related signals and further eliminate the interference of environmental noise and other non-arc-related signals.

[0050] Although the frequency component of the signal after bandpass filtering is pure, it may still contain AC components. The function of the rectifier filter circuit is to convert the AC signal into a DC signal (rectification), and further smooth it through the filter circuit to obtain a stable DC level output. This process helps the comparison circuit to judge the signal strength more stably, because the comparison circuit usually processes DC or quasi-DC signals more efficiently and accurately.

[0051] The DC signal processed by the rectifier and filter circuit is sent to the first end of the comparison circuit. Here, the signal will be compared with the preset first reference voltage and second reference voltage. If the voltage value of the signal exceeds the preset threshold, the comparison circuit will output a signal, which will be transmitted to the controller through the logic judgment circuit to trigger the corresponding alarm or protection measures.

[0052] like Figure 2 As shown, the comparison circuit in this embodiment includes a resistor R1, an operational amplifier U1 and an operational amplifier U2; the first end of the resistor R1 is connected to the output end of the signal processing circuit, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U1, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U1 is connected to the first reference voltage, the non-inverting input end of the operational amplifier U2 is connected to the second reference voltage, the output end of the operational amplifier U1 is connected to the logic judgment circuit, and the output end of the operational amplifier U2 is connected to the logic judgment circuit.

[0053] In this embodiment, when an arc occurs in the electrical device, an ultrasonic wave of 25-45kHz is emitted, and two reference voltages (i.e., a first reference voltage and a second reference voltage) are set based on this band. In this embodiment, it is assumed that the first reference voltage is 2V and the second reference voltage is 5V. The voltage amplitude range corresponding to the arc occurrence is 2-5V, and only when the output voltage of the signal processing circuit is between 2-5V, will it be determined that an arc occurs in the electrical device.

[0054] When the output voltage of the signal processing circuit is less than 2V, op amp U1 and op amp U2 both output a high level. When the output voltage of the signal processing circuit is greater than 5V, op amp U1 and op amp U2 both output a low level. When the output voltage of the signal processing circuit is between 2-5V, op amp U1 outputs a low level and op amp U2 outputs a high level.

[0055] like Figure 2 As shown, the logic judgment circuit in this embodiment includes a NOT gate U3, a D flip-flop U4 and a NOT gate U5; the input end of the NOT gate U3 is connected to the output end of the operational amplifier U2, the output end of the NOT gate U3 is connected to the clock end of the D flip-flop U4, the input end of the D flip-flop U4 is connected to the output end of the operational amplifier U1, the output end of the D flip-flop U4 is connected to the input end of the NOT gate U5, and the output end of the NOT gate U5 is connected to the controller.

[0056] In this embodiment, when the output voltage of the signal processing circuit is less than 2V, both the op amp U1 and the op amp U2 output a high level, and the clock end of the D flip-flop U4 is a low level, so the output end of the D flip-flop U4 is 0; when the output voltage of the signal processing circuit is greater than 5V, both the op amp U1 and the op amp U2 output a low level, and the low level is inverted by the NOT gate U3 and converted to a high level and sent to the clock end of the D flip-flop. At this time, since the input end of the D flip-flop U4 is a low level, the D flip-flop U4 outputs a low level; when the output voltage of the signal processing circuit is between 2-5V, the op amp U1 outputs a low level, and is inverted by the NOT gate U3 and converted to a high level and sent to the clock end of the D flip-flop, and the op amp U2 outputs a high level, so the input end of the D flip-flop U4 is a high level, and the D flip-flop U4 outputs a high level. It can be seen that when an arc occurs in the electrical equipment, the logic judgment circuit outputs a high level. Only when the controller receives the high level of the logic judgment circuit, it indicates that an arc has occurred in the electrical equipment, and the controller sends the signal to the monitoring terminal through the wireless communication module.

[0057] like Figure 2 As shown, the amplifier circuit in this embodiment includes a capacitor C3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and an amplifier U6; the first end of the capacitor C3 is connected to the ultrasonic sensor, the second end of the capacitor C3 is grounded through the resistor R4, the second end of the capacitor C3 is connected to the first inverting input terminal of the amplifier U6 through the resistor R5, the first non-inverting input terminal of the amplifier U6 is grounded through the resistor R6, the first output terminal of the amplifier U6 is connected to the first inverting input terminal of the amplifier U6 through the resistor R7, the output terminal of the amplifier U6 is connected to the second non-inverting input terminal of the amplifier U6, the second output terminal of the amplifier U6 is connected to the second output terminal of the amplifier U6, and the second output terminal of the amplifier U6 is connected to the bandpass filter circuit.

[0058] In this embodiment, the electrical signal output by the ultrasonic sensor is relatively weak, and the amplifier circuit is used to amplify the electrical signal output by the ultrasonic sensor. Two independent operational amplifiers are integrated inside the amplifier U6, wherein the first in-phase input terminal of the amplifier U6, the first inverting input terminal of the amplifier U6 and the first output terminal of the amplifier U6 constitute the amplifier circuit, and the second in-phase input terminal of the amplifier U6, the second inverting input terminal of the amplifier U6 and the second output terminal of the amplifier U6 constitute the follower circuit, which is used to improve the effectiveness of signal transmission. The amplified electrical signal is sent to the bandpass filter circuit.

[0059] like Figure 2As shown, the bandpass filter circuit in this embodiment includes a resistor R9, a capacitor C7, a capacitor C8, a resistor R10, an operational amplifier U7, a resistor R13, a resistor R12 and a resistor R11; a first end of the resistor R9 is connected to the output end of the amplifier circuit, a second end of the resistor R9 is grounded through the capacitor C7, a second end of the resistor R9 is connected to the inverting input end of the operational amplifier U7 through the capacitor C8, the inverting input end of the operational amplifier U7 is grounded through the resistor R10, the non-inverting input end of the operational amplifier U7 is grounded through the resistor R13, the output end of the operational amplifier U7 is connected to the second end of the resistor R9 through the resistor R11, the output end of the operational amplifier U7 is connected to the non-inverting input end of the operational amplifier U7 through the resistor R12, and the output end of the operational amplifier U7 is connected to the rectifier and filter circuit.

[0060] In this embodiment, the resistor R9 and the capacitor C7 form a low-pass filter circuit for filtering out high-frequency clutter signals, and the capacitor C8 and the resistor R10 form a high-pass filter circuit for filtering out noise interference in the signal.

[0061] like Figure 2 As shown, the rectifier and filter circuit in this embodiment includes a diode D1, a capacitor C4, a resistor R8 and a capacitor C5; the anode of the diode D1 is connected to the output end of the band-pass filter circuit, the cathode of the diode D1 is grounded through the capacitor C4, the cathode of the diode D1 is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded through the capacitor C5, and the second end of the resistor R8 is connected to the first end of the comparison circuit.

[0062] In this embodiment, the electrical signal output by the bandpass filter circuit is an AC signal. In order to meet the working requirements of the comparison circuit, the AC signal output by the bandpass filter circuit needs to be converted into a DC signal.

[0063] The diode D1 and the capacitor C4 form a rectifier filter circuit for converting the AC signal into a DC signal, and the resistor R8 and the capacitor C5 form a low-pass filter circuit for filtering the rectified and filtered DC signal again to further improve the detection accuracy of the circuit.

[0064] like Figure 1 As shown, the electrical safety intelligent monitoring system in this embodiment also includes a temperature detection circuit and a smoke detection circuit; the temperature detection circuit and the smoke detection circuit are both connected to the controller.

[0065] In this embodiment, the electrical safety intelligent monitoring system further enhances its ability to provide early warning of electrical fires by integrating temperature detection circuits and smoke detection circuits. The integration of these additional monitoring components with the controller enables the system to monitor the safety status of electrical equipment and the environment in an all-round and multi-dimensional manner.

[0066] In this embodiment, the temperature detection circuit generally includes temperature sensors (such as thermocouples, thermal resistors, infrared sensors, etc.), which are deployed at key heating parts of electrical equipment or monitoring points of the environment. They can monitor the surface temperature or ambient temperature changes of electrical equipment in real time during operation. When an abnormal temperature rise is detected and exceeds a preset safety threshold, the temperature detection circuit will send this emergency information to the controller. Such temperature anomalies are often a sign of potential fire risks such as overload, short circuit or insulation aging of electrical equipment.

[0067] In this embodiment, the smoke detection circuit uses a smoke sensor (such as a photoelectric, ion or laser scattering sensor) to detect the smoke concentration in the air. Smoke is a typical sign of the early stage of a fire, so smoke detection is one of the effective means of preventing fire. When the sensor detects that the smoke concentration reaches the alarm threshold, the smoke detection circuit will immediately transmit an alarm signal to the controller, indicating that there may be a fire source or combustion phenomenon.

[0068] As the central processing unit of the system, the controller receives all data from the arc detection module, temperature detection circuit, and smoke detection circuit. It conducts a comprehensive analysis of these data to determine whether there is a risk of electrical fire. When any one or more monitoring modules sound an alarm, the controller will immediately execute a predetermined response strategy, which may include but is not limited to: activating sound and light alarms, cutting off power, sending alarm information to the remote monitoring center or the mobile device of designated managers, and activating fire linkage equipment. By integrating multi-dimensional monitoring methods, the electrical safety intelligent monitoring system can identify fire hazards more quickly and accurately, significantly improve the efficiency and reliability of electrical fire prevention, and provide strong protection for protecting personnel and property safety.

[0069] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure 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. However, 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 embodiments of the present disclosure.

Claims

1. Electrical safety intelligent monitoring system, characterized in that: It includes an arc detection module, a controller and a wireless communication module; The arc detection module is used to detect arcs generated during the operation of the electrical equipment, and the arc detection module is connected to the controller; The controller is connected to the monitoring terminal through the wireless communication module; The arc detection module includes an ultrasonic sensor, a signal processing circuit, a comparison circuit and a logic judgment circuit; The ultrasonic sensor is used to detect arcs generated during the operation of electrical equipment, the ultrasonic sensor is connected to the input end of the signal processing circuit, the output end of the signal processing circuit is connected to the first end of the comparison circuit, the second end of the comparison circuit is used to connect to a first reference voltage, and the second end of the comparison circuit is used to connect to a second reference voltage; The fourth terminal of the comparison circuit is connected to the controller through the logic judgment circuit.

2. The electrical safety intelligent monitoring system according to claim 1, characterized in that: The signal processing circuit includes an amplifier circuit, a bandpass filter circuit and a rectifier filter circuit; The input end of the amplifier circuit is connected to the ultrasonic sensor, the output end of the amplifier circuit is connected to the input end of the bandpass filter circuit, the output end of the bandpass filter circuit is connected to the input end of the rectifier filter circuit, and the output end of the rectifier filter circuit is connected to the first end of the comparison circuit.

3. The electrical safety intelligent monitoring system according to claim 1, characterized in that: The comparison circuit includes a resistor R1, an operational amplifier U1 and an operational amplifier U2; The first end of the resistor R1 is connected to the output end of the signal processing circuit, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U1, the second end of the resistor R1 is connected to the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U1 is connected to a first reference voltage, the non-inverting input end of the operational amplifier U2 is connected to a second reference voltage, the output end of the operational amplifier U1 is connected to the logic judgment circuit, and the output end of the operational amplifier U2 is connected to the logic judgment circuit.

4. The electrical safety intelligent monitoring system according to claim 3, characterized in that: The logic judgment circuit includes a NOT gate U3, a D flip-flop U4 and a NOT gate U5; The input end of the NOT gate U3 is connected to the output end of the operational amplifier U2, the output end of the NOT gate U3 is connected to the clock end of the D flip-flop U4, the input end of the D flip-flop U4 is connected to the output end of the operational amplifier U1, the output end of the D flip-flop U4 is connected to the input end of the NOT gate U5, and the output end of the NOT gate U5 is connected to the controller.

5. The electrical safety intelligent monitoring system according to claim 2, characterized in that: The amplifying circuit includes a capacitor C3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and an amplifier U6; The first end of the capacitor C3 is connected to the ultrasonic sensor, the second end of the capacitor C3 is grounded through the resistor R4, the second end of the capacitor C3 is connected to the first inverting input terminal of the amplifier U6 through the resistor R5, the first non-inverting input terminal of the amplifier U6 is grounded through the resistor R6, the first output terminal of the amplifier U6 is connected to the first inverting input terminal of the amplifier U6 through the resistor R7, the output terminal of the amplifier U6 is connected to the second non-inverting input terminal of the amplifier U6, the second output terminal of the amplifier U6 is connected to the second output terminal of the amplifier U6, and the second output terminal of the amplifier U6 is connected to the band-pass filter circuit.

6. The electrical safety intelligent monitoring system according to claim 2, characterized in that: The bandpass filter circuit includes a resistor R9, a capacitor C7, a capacitor C8, a resistor R10, an operational amplifier U7, a resistor R13, a resistor R12 and a resistor R11; The first end of the resistor R9 is connected to the output end of the amplifier circuit, the second end of the resistor R9 is grounded through the capacitor C7, the second end of the resistor R9 is connected to the inverting input end of the operational amplifier U7 through the capacitor C8, the inverting input end of the operational amplifier U7 is grounded through the resistor R10, the non-inverting input end of the operational amplifier U7 is grounded through the resistor R13, the output end of the operational amplifier U7 is connected to the second end of the resistor R9 through the resistor R11, the output end of the operational amplifier U7 is connected to the non-inverting input end of the operational amplifier U7 through the resistor R12, and the output end of the operational amplifier U7 is connected to the rectifier and filter circuit.

7. The electrical safety intelligent monitoring system according to claim 2, characterized in that: The rectification and filtering circuit includes a diode D1, a capacitor C4, a resistor R8 and a capacitor C5; The anode of the diode D1 is connected to the output end of the bandpass filter circuit, the cathode of the diode D1 is grounded through the capacitor C4, the cathode of the diode D1 is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded through the capacitor C5, and the second end of the resistor R8 is connected to the first end of the comparison circuit.

8. The electrical safety intelligent monitoring system according to claim 1, characterized in that: It also includes a temperature detection circuit and a smoke detection circuit; The temperature detection circuit and the smoke detection circuit are both connected to the controller.

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