Low-voltage branch circuit power failure sensing alarm device and alarm method

Abstract

The invention provides low-voltage branch circuit power failure sensing alarm equipment and an alarm method, which are applied to the technical field of low-voltage equipment. The device comprises a voltage sensing module used for sensing an electric field generated by a low-voltage branch line and outputting a voltage trigger signal; the embedded controller comprises a CPU (Central Processing Unit) central controller and a communication module, the CPU central controller is used for receiving a voltage trigger signal and confirming whether the low-voltage branch line is powered off, and the communication module is used for communicating with a remote server in real time; the sound-light alarm module is used for receiving a power failure alarm signal sent by the embedded controller to trigger a sound-light alarm; the power supply module is used for supplying power to the low-voltage branch circuit power failure sensing alarm device. Therefore, the low-voltage branch circuit power failure sensing and warning equipment can sense the power failure condition of the branch circuit in time, triggers sound-light alarm, and uploads information to the remote server through the communication module, thereby realizing real-time monitoring, and solving the technical problem of low power failure monitoring efficiency of the low-voltage branch circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage equipment, and in particular to a low-voltage branch circuit power outage sensing and alarming device and an alarming method. Background Art

[0002] Traditional low-voltage branch line power outage monitoring methods often rely on manual inspections or regular inspections, and cannot achieve real-time monitoring and rapid response to power outage faults. This results in the inability to quickly locate and handle faults when they occur, which prolongs the power outage time and affects the user's power experience. Due to technical limitations, some low-voltage branch lines may be in monitoring blind spots and cannot be effectively covered. Once a power outage occurs in these areas, it will be difficult to detect and handle them in a timely manner, increasing the risk of power grid operation. In addition, because traditional monitoring equipment often operates independently, there is a lack of a unified data management platform. This makes it impossible to centrally manage and analyze monitoring data, making it difficult to share and comprehensively utilize data.

[0003] Therefore, there is a technical problem in the prior art that the efficiency of low-voltage branch line power outage monitoring is low. Summary of the invention

[0004] The main purpose of the present application is to provide a low-voltage branch circuit power outage sensing alarm device and an alarm method, so as to at least solve the technical problem of low efficiency of low-voltage branch line power outage monitoring in the prior art.

[0005] In order to achieve the above-mentioned object, according to an embodiment of the present application, a low-voltage branch circuit power outage sensing and alarming device is provided, the device comprising:

[0006] A voltage sensing module is installed on a low-voltage branch line, the voltage sensing module is used to sense the electric field generated by the low-voltage branch line and output a voltage trigger signal, the voltage sensing module includes an electric field sensor and a signal processing unit, wherein the electric field sensor monitors the electric field generated by the low-voltage branch line and generates an electric field signal, the signal processing unit is used to receive the electric field signal transmitted by the electric field sensor, generate a voltage trigger signal according to the electric field signal and transmit it to the embedded controller, the low-voltage branch line includes a low-voltage A-phase line, a low-voltage B-phase line and a low-voltage C-phase line;

[0007] The embedded controller is electrically connected to the voltage sensing module, and includes a CPU central controller and a communication module, wherein the CPU central controller is used to receive the voltage trigger signal and confirm whether the low-voltage branch line is powered off, and the communication module is used to communicate with the remote server in real time, and the embedded controller also includes a real-time clock and a memory, wherein the real-time clock is used to generate a clock signal and input it into the CPU central controller, and the memory is used to store data generated by the CPU central controller;

[0008] A power module is electrically connected to the voltage sensing module, the embedded controller and the sound and light alarm module, the power module includes a photovoltaic panel, a battery and a power control board, wherein the photovoltaic panel is used to generate electricity and charges the battery after conversion by the power control board, the battery is used to supply power to the voltage sensing module, the embedded controller and the sound and light alarm module, the power control board includes a charge and discharge control board and a DC regulated power supply module, wherein the output end of the charge and discharge control board is connected to the input end of the DC regulated power supply module, and the output end of the DC regulated power supply module is connected to the input end of the CPU central controller;

[0009] An equipment box, wherein the embedded controller, the storage battery and the power control board are all installed inside the equipment box and the photovoltaic panel is installed obliquely on the top of the equipment box;

[0010] The sound and light alarm module is electrically connected to the embedded controller, and is used to receive the power outage alarm signal sent by the embedded controller to trigger the sound and light alarm, wherein the waterproof speakers of the sound and light alarm module are installed on both sides of the equipment box, and the warning light of the sound and light alarm module is installed on one side of the equipment box.

[0011] Optionally, the back side of the device box is mounted on a plurality of mounting brackets, and the mounting brackets are used to fix the device box.

[0012] Optionally, the low-voltage branch circuit power outage sensing alarm device also includes a sensor connector, which is installed at the bottom of the device case and connected between the embedded controller and the voltage sensing module, and the sensor connector is used to achieve electrical connection between the voltage sensing module and the embedded controller.

[0013] Optionally, the voltage sensing module further includes an elastic clamping ring, which is installed on the outer side of the voltage sensing module and is used to clamp the low-voltage branch line.

[0014] Optionally, the elastic clamp ring further includes a paddle, the paddle is installed on the outside of the elastic clamp ring, and the paddle is used to control the elastic clamp ring.

[0015] According to an embodiment of the present application, a low-voltage branch circuit power outage sensing and alarm method is also provided, which is applied to the low-voltage branch circuit power outage sensing and alarm device, and the method includes: obtaining a voltage trigger signal through a voltage sensing module to obtain a first target signal, and band-pass filtering the first target signal through an embedded controller to obtain a second target signal; performing frequency detection on the second target signal with a preset analysis window through the embedded controller, and when the frequency detection passes, calculating the signal effective strength based on the second target signal through the embedded controller and performing a dynamic threshold judgment on the second target signal according to the signal effective strength; when the dynamic threshold judgment passes, if the signal effective strength is less than a preset threshold and continues for more than a preset time, a target alarm information is issued through the sound and light alarm module.

[0016] Optionally, the first target signal is bandpass filtered by an embedded controller to obtain a second target signal, including: inputting the first target signal into a bandpass filter to obtain the second target signal: y[n]=x[n]*h[n]; wherein y[n] is the second target signal, x[n] is the first target signal, and h[n] is the impulse response of the bandpass filter.

[0017] Optionally, the embedded controller performs frequency detection on the second target signal with a preset analysis window, including: performing a fast Fourier transform on the second target signal, converting the second target signal into a frequency domain for representation, and obtaining a third target signal: Among them, Y[f] is the third target signal, N is the number of sampling points in the preset analysis window, and f is the frequency of the third target signal; based on the third target signal, the frequency component corresponding to the maximum amplitude in the spectrum is determined to obtain the target frequency, and when the target frequency is within the filtering range of the bandpass filter, it is determined that the frequency detection is passed.

[0018] Optionally, calculating the signal effective strength based on the second target signal by the embedded controller and performing a dynamic threshold determination on the second target signal according to the signal effective strength includes: calculating an effective value based on the second target signal to obtain the signal effective strength: Wherein, k is the serial number of the cycle, T is the number of sampling points in the cycle, K is the total number of cycles, and RSK[K] is the effective signal strength; based on the effective signal strength, the first threshold and the second threshold are determined: Among them, Th high is the first threshold, Th low is the second threshold, is the mean of the effective signal strength, σ is the standard deviation of environmental noise; when the effective signal strength is greater than or equal to the first threshold, it is determined that the second target signal exists; when the effective signal strength is less than or equal to the second threshold, it is determined that the second target signal disappears; when the effective signal strength is greater than the second threshold and less than the first threshold, it is determined that the second target signal is weak; when the signal strength of the second target signal is present or weak, it is determined that the dynamic threshold determination is passed.

[0019] Optionally, if the effective strength of the signal is less than a preset threshold and lasts for more than a preset time, before issuing a target alarm message through the sound and light alarm module, the method further includes: calculating the product of the effective strength of the signal and a preset ratio to obtain the preset threshold.

[0020] In an embodiment of the present invention, a low-voltage branch circuit power outage sensing and alarm device is provided, which is applied to the technical field of low-voltage equipment. The device includes: a voltage sensing module, which is used to sense the electric field generated by the low-voltage branch line and output a voltage trigger signal; an embedded controller, including a CPU central controller and a communication module, wherein the CPU central controller is used to receive the voltage trigger signal and confirm whether the low-voltage branch line is powered off, and the communication module is used to communicate with the remote server in real time; an audio-visual alarm module, which is used to receive the power outage alarm signal issued by the embedded controller to trigger the audio-visual alarm; a power supply module, which is used to supply power to the low-voltage branch circuit power outage sensing and alarm device. Therefore, the low-voltage branch circuit power outage sensing and alarm device can timely sense the power outage of the branch line and trigger the audio-visual alarm. At the same time, the information is uploaded to the remote server through the communication module to achieve real-time monitoring, which solves the technical problem of low efficiency of low-voltage branch line power outage monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural block diagram of a low-voltage branch line power outage sensing remote alarm device provided according to an embodiment of the present application;

[0022] Figure 2 It is a structural schematic diagram of a low-voltage branch line power outage sensing remote alarm device provided according to an embodiment of the present application;

[0023] Figure 3 It is a schematic diagram of the internal structure of a low-voltage branch line power outage sensing remote alarm device provided according to an embodiment of the present application;

[0024] Figure 4 is a structural schematic diagram of a pressure sensing module provided according to an embodiment of the present application;

[0025] Figure 5It is a module block diagram of a low-voltage branch line power outage sensing remote alarm device provided according to an embodiment of the present application;

[0026] Figure 6 It is a flow chart of a low-voltage branch line power outage sensing and remote alarm method provided according to an embodiment of the present application.

[0027] Explanation of the accompanying drawings: 101, voltage sensing module; 102, embedded controller; 103, sound and light alarm module; 104, power module; 1, equipment box; 2, photovoltaic panel; 3, waterproof speaker; 4, warning light; 5, sensor connector; 6, embedded controller; 61, CPU central controller; 62, communication module; 63, real-time clock; 64, charge and discharge control board; 65, DC regulated power supply module; 7, battery; 8, voltage sensing module; 81, electric field sensor; 82, signal processing unit; 91, elastic clamp ring; 92, pick. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] As introduced in the background technology, there is a technical problem in the prior art that the efficiency of low-voltage branch line power outage monitoring is low. The embodiments of the present application provide a low-voltage branch circuit power outage sensing alarm device and an alarm method.

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] Figure 1 1 is a structural block diagram of a low-voltage branch line power outage sensing remote alarm device provided according to an embodiment of the present application. Figure 1 As shown, the device includes the following modules:

[0034] The voltage sensing module 101 is installed in the low-voltage branch line. The voltage sensing module is used to sense the electric field generated by the low-voltage branch line and output a voltage trigger signal. The low-voltage branch line includes a low-voltage A-phase line, a low-voltage B-phase line and a low-voltage C-phase line.

[0035] Specifically, the voltage sensing module is fixedly installed on the low-voltage branch line to sense the electric field changes of the low-voltage A-phase line, B-phase line and C-phase line. When the electric field disappears or the voltage is lower than the set threshold, the voltage sensing module will output a voltage trigger signal to the embedded controller, indicating that the line may be in a power outage state. By sensing the electric field of the low-voltage line, the voltage sensing module can quickly identify power outages or abnormal line voltages, and has a highly sensitive voltage monitoring capability, thereby ensuring the real-time and accuracy of the power outage signal and improving the reliability of the system alarm.

[0036] The embedded controller 102 is electrically connected to the voltage sensing module. The embedded controller includes a CPU central controller and a communication module. The CPU central controller is used to receive a voltage trigger signal and confirm whether the low-voltage branch line is out of power. The communication module is used to communicate with the remote server in real time.

[0037] Specifically, the embedded controller is electrically connected to the voltage sensing module, and includes a CPU central controller and a communication module. The CPU central controller receives the trigger signal of the voltage sensing module, automatically analyzes the current line status and determines whether a power outage occurs. The communication module is connected to the remote server wirelessly or wired, and uploads the real-time status information of the line to the background server for remote monitoring and data recording. The embedded controller can autonomously determine the line status and send the power outage information to the remote server in a timely manner, realizing the automatic monitoring and remote alarm of the low-voltage branch circuit. This design effectively improves the automation level of fault monitoring and facilitates the unified management of power outage information by the system.

[0038] The sound and light alarm module 103 is electrically connected to the embedded controller, and is used to receive a power failure alarm signal sent by the embedded controller to trigger a sound and light alarm.

[0039] Specifically, the sound and light alarm module is connected to the embedded controller and is used to receive the power outage alarm signal from the controller. Once the power outage is confirmed, the sound and light alarm module is immediately activated, emitting a high-brightness light signal and a high-decibel sound alarm to remind on-site personnel of the power outage status of the circuit. The sound and light alarm module provides an on-site alarm function to ensure that the power outage information can be conveyed to the on-site personnel in a timely manner, increasing the visual warning effect of the system, especially suitable for environments with high noise or insufficient light, so that on-site personnel can respond quickly.

[0040] The power module 104 is electrically connected to the voltage sensing module, the embedded controller and the sound and light alarm module. The power module includes a photovoltaic panel, a battery and a power control board. The photovoltaic panel is used to generate electricity and charges the battery after conversion by the power control board. The battery is used to power the voltage sensing module, the embedded controller and the sound and light alarm module.

[0041] Specifically, the power module provides a stable power supply for the entire power outage alarm device, including photovoltaic panels, batteries and power control boards. Photovoltaic panels are used to convert solar energy into electrical energy, which is then charged by the power control board after voltage stabilization. The battery provides continuous power supply to the voltage sensing module, embedded controller and sound and light alarm module, ensuring normal operation even in a power outage. The power module design provides independent power guarantee for the device, using photovoltaic panels to achieve environmentally friendly self-power supply, suitable for installation outdoors or in remote areas. The backup power function of the battery ensures that the device can still work normally during a power outage, increasing the reliability and endurance of the device.

[0042] Therefore, the low-voltage branch circuit power outage sensing and alarm device provided in the embodiment of the present invention can timely sense the power outage of the branch line and trigger an audible and visual alarm. At the same time, it uploads the information to the remote server through the communication module, relies on an independent power supply system to achieve stable operation around the clock and realize real-time monitoring, thus solving the technical problem of low efficiency of low-voltage branch line power outage monitoring.

[0043] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the specific structure of the low-voltage branch line power outage sensing remote alarm device of the present application will be described in detail below in combination with specific embodiments.

[0044] This embodiment relates to a specific low-voltage branch line power outage sensing remote alarm device. Figure 2 The structural diagram of the low-voltage branch line power outage sensing remote alarm device is Figure 3 This is a schematic diagram of the internal structure of the low-voltage branch line power outage sensing remote alarm device. Figure 4 It is a module block diagram of a low-voltage branch line power outage sensing remote alarm device, such as Figure 2-4 As shown, it includes the following structure:

[0045] 1. Equipment box; 2. Photovoltaic panel; 3. Waterproof speaker; 4. Warning light; 5. Sensor connector; 6. Embedded controller; 61. CPU central controller; 62. Communication module; 63. Real-time clock; 64. Charge and discharge control board; 65. DC regulated power supply module; 7. Battery; 8. Voltage sensing module; 81. Electric field sensor; 82. Signal processing unit; 91. Elastic clamp ring; 92. Pick.

[0046] The voltage sensing modules 8 are installed on the low-voltage A-phase, B-phase, and C-phase lines respectively. Their main task is to monitor the changes in the electric field generated by each phase line. Under normal circumstances, the voltage sensing modules 8 will generate a stable 5V voltage trigger signal, indicating that the line power supply is normal. However, once an abnormality is detected, such as a power outage, they will quickly generate a voltage trigger signal in the range of 0-2.5V. This changing signal is immediately sent to the embedded controller 6 to indicate a possible fault condition.

[0047] The embedded controller 6 is responsible for receiving the voltage trigger signal from the voltage sensing module 8 and determining the line status according to the voltage level of the signal. In addition to basic signal processing, the embedded controller 6 also has a real-time clock 63, a memory and a communication module 62, which enables it to automatically adjust the alarm strategy according to time, store a variety of voice information, and communicate with a remote server or management platform.

[0048] After receiving the instruction from the embedded controller 6, the sound and light module will start immediately, and alert the user to the abnormal situation of the power supply line by issuing a clear sound alarm and a significant light flashing. The power module is composed of a photovoltaic panel 2, a battery 7 and a power control board. It ensures that the device is charged through the photovoltaic panel 2 when there is sufficient sunshine, and provides stable power support through the battery 7 when there is insufficient sunshine or at night.

[0049] When a power outage occurs in any one or two phases of the low-voltage branch line, the corresponding voltage sensing module 8 will detect the change in the electric field and generate a voltage trigger signal (0-2.5V) that is different from the normal state. After receiving this abnormal signal, the embedded controller 6 will immediately determine the type of fault and trigger the sound and light module to issue an alarm according to the preset logic. At the same time, the embedded controller 6 will also upload the fault information to the remote server or related management platform in real time through the communication module 62, so that the background personnel can respond quickly and handle the fault. When a power outage occurs in the low-voltage A phase, B phase, and C phase lines, the three electric field sensors 81 will detect the change in electric field strength (0-2.5V). The embedded controller 6 sends an alarm message to the power grid background through the communication module 62 to remind the power supply abnormality (it may be a failure of a nearby substation).

[0050] The low-voltage branch circuit power outage sensing alarm device also includes a device box 1, an embedded controller 6, a battery 7 and a power control board are all installed inside the device box 1, and a photovoltaic panel 2 is installed obliquely on the top of the device box 1.

[0051] Specifically, the low-voltage branch circuit power outage sensing alarm device is equipped with a protective device box, and the embedded controller, battery and power control board are all installed inside the device box. The device box is made of weather-resistant, waterproof and dust-proof materials, which can withstand harsh environmental conditions and provide protection for the internal equipment. By adding the device box, key components such as the embedded controller, battery and power control board are protected from environmental influences, thereby extending the service life of the equipment and improving the stability and reliability of the system. The design of the device box is suitable for outdoor installation, which is convenient for the wide application of the equipment in different environments. The photovoltaic panel is installed on the top of the device box and is designed to be tilted to increase the light receiving area and efficiency of the photovoltaic panel, so that the photovoltaic panel can still be charged under weak light conditions. The angle of the photovoltaic panel can be appropriately adjusted according to the geographical location of the installation environment to ensure the best power generation efficiency. The tilted photovoltaic panel increases the power generation capacity by increasing the light receiving efficiency, ensuring that the battery can be stably charged, thereby providing continuous power supply guarantee for the power outage sensing alarm device. At the same time, the design of the tilt angle of the photovoltaic panel effectively reduces the accumulation of rain or dust on the panel surface, reduces the maintenance frequency, and improves the practicality of the equipment.

[0052] The design of the equipment box places the core components in the protective structure, and increases the photoelectric conversion efficiency and self-cleaning function through the tilted photovoltaic panels, thereby significantly improving the reliability and adaptability of the equipment under outdoor conditions. The overall structure optimizes the stability and power generation efficiency of the equipment, making the equipment long-term and low-maintenance.

[0053] The sound and light alarm module includes a waterproof speaker 3 and a warning light 4 , wherein the waterproof speakers 3 are respectively installed on both sides of the device box 1 , and the warning light 4 is installed on one side of the top of the device box 1 .

[0054] The waterproof speaker 3 is the sound output part of the sound and light module. Its main function is to issue a loud alarm when a power outage is detected. Since the equipment may be installed outdoors, the speaker must be waterproof to prevent damage from rain, moisture, etc. In the equipment case 1, the waterproof speaker 3 is usually installed on both sides, which can ensure that the sound can spread all around and improve the coverage of the alarm. The warning light 4 is the light signal output part of the sound and light module. Its function is to attract people's attention by flashing or always on. In the equipment case 1, the warning light 4 is usually installed on one side of the top, which can make the light more obvious and convenient for people in the distance to observe. The color and flashing frequency of the warning light 4 are usually selected according to the actual application scenario and needs to ensure that it has good visibility and warning effect.

[0055] Specifically, the sound and light alarm module includes a waterproof speaker, which is installed on both sides of the equipment box. The waterproof speaker can emit a high-decibel warning sound when the equipment detects a power outage in the low-voltage branch circuit, ensuring that it can work normally in bad weather and warn the surrounding environment. The design of the waterproof speaker greatly improves the adaptability of the sound and light alarm module, especially for outdoor environments with high humidity or dust. The speakers installed on both sides expand the sound coverage range, ensuring that the alarm sound can be clearly heard in a larger range, thereby effectively improving the alarm capability of the equipment. The warning light is installed on the side of the top of the equipment box, and the position is selected on one side of the top of the box to ensure its visibility within 360 degrees around the equipment. The warning light uses high-brightness, long-life LED lamp beads, and has waterproof and dustproof functions. It can flash and emit light to warn when a power outage is detected. The high brightness and installation position of the warning light make it clearly visible during the day or at night, thereby enhancing the warning effect of the equipment in various environments. The top installation ensures the visibility of the alarm signal, especially for scenes such as squares and factory areas that require long-distance visual alarms.

[0056] By adding a waterproof speaker and a high-brightness warning light, the sound and light alarm module can not only emit a high-decibel sound when warning, but also provide a significant visual reminder, enhancing the warning effect. The waterproof design ensures the stable operation of the device under various harsh conditions, making the device more suitable for demanding application scenarios such as outdoor or industrial environments.

[0057] The back of the device box 1 is mounted on a plurality of mounting brackets, and the mounting brackets are used to fix the device box 1 .

[0058] Specifically, the back of the equipment box is fixed by multiple mounting brackets. The brackets are made of corrosion-resistant metal or weather-resistant materials, and can maintain strength and stability under various environmental conditions. The number and position of the mounting brackets are precisely designed to ensure that the equipment box is evenly stressed on the mounting surface. The bracket can be installed on a wall, pole or other mounting base by bolts or other fasteners, which facilitates the secure installation of the equipment outdoors or at high altitudes. The mounting bracket design provides a flexible installation method, so that the equipment box can be firmly fixed on different mounting surfaces. The anti-corrosion material of the bracket ensures that the equipment can still be used for a long time in harsh environments such as humidity, acid and alkali, effectively increasing the service life of the equipment. The multi-bracket support structure disperses the weight of the box, preventing the equipment from loosening or tilting due to uneven force, thereby ensuring the stability of the equipment operation.

[0059] By designing multiple mounting brackets on the back of the equipment box, the equipment can be firmly fixed in different environments. The multi-bracket design disperses the weight load of the equipment, enhances the earthquake resistance and windproof performance, and is particularly suitable for outdoor or high-altitude environments, further improving the adaptability and installation convenience of the equipment.

[0060] The low-voltage branch circuit power outage sensing alarm device also includes a sensor connector 5, which is installed at the bottom of the device box 1 and connected between the embedded controller 6 and the voltage sensing module 8. The sensor connector 5 is used to realize the electrical connection between the voltage sensing module 8 and the embedded controller 6.

[0061] Specifically, the sensor connector is installed at the bottom of the equipment box 1. It has a compact structure, is corrosion-resistant, and can effectively resist external environmental influences such as dust and moisture. One end of the sensor connector is connected to the voltage sensing module, and the other end is connected to the embedded controller to achieve electrical connection and signal transmission between the voltage sensing module and the embedded controller. The connector adopts a quick plug-in design, which is easy to maintain and replace, ensuring the stability of signal transmission. The sensor connector not only ensures a reliable connection between the voltage sensing module and the embedded controller, but also improves the anti-interference performance of the system. The bottom installation position reduces the exposure of the connector and further enhances the protection capability of the connector. The quick plug-in design improves maintenance efficiency and facilitates on-site technicians to quickly inspect and replace when needed, thereby improving the maintainability and reliability of the equipment.

[0062] By adding a sensor connector, the device achieves a stable electrical connection between the low-voltage circuit sensing module and the controller, while facilitating installation and maintenance. In harsh environments, the connector's protective design reduces the impact of external interference on the signal, improving the stability and durability of the overall system.

[0063] The power control board includes a charge and discharge control board 64 and a DC regulated power supply module 65 , wherein the output end of the charge and discharge control board 64 is connected to the input end of the DC regulated power supply module 65 , and the output end of the DC regulated power supply module 65 is connected to the input end of the CPU central controller 61 .

[0064] When light shines on the semiconductor material on the photovoltaic panel 2, electrons are excited, thereby generating current. The battery 7 plays an energy storage role in the system. When the electric energy generated by the photovoltaic panel 2 exceeds the current demand, the excess electric energy will be stored in the battery 7; and when there is insufficient light or at night, the battery 7 releases the stored electric energy to supply power. The main function of the charge and discharge control board 64 is to regulate and manage the charging and discharging process of the battery 7, protect the battery 7 from damage such as overcharging and over-discharging, and extend its service life. At the same time, it is also responsible for stably transmitting the electric energy generated by the photovoltaic panel 2 to the next level circuit. The DC regulated power supply module 65 receives the electric energy output by the charge and discharge control board 64, and further performs voltage stabilization processing on it to ensure that the output electric energy quality is stable and meets the voltage requirements of subsequent circuits (especially precision electronic equipment such as the CPU central controller 61). Through DC voltage stabilization, the impact of voltage fluctuations on equipment performance can be effectively reduced.

[0065] Specifically, the charge and discharge control board is used to control and manage the charge and discharge process of the battery. The input end of the charge and discharge control board is connected to the photovoltaic panel power generation output, and automatically charges when the battery is detected to be insufficient, and stops charging when the battery is fully charged to prevent overcharging or over-discharging from damaging the battery. The control board uses an intelligent power management chip to ensure the safe operation of the device under low power or overvoltage conditions. Through the charge and discharge control board, the charging and discharging process of the battery can be accurately managed, effectively extending the service life of the battery, while avoiding the safety hazards caused by overcharging and over-discharging. The intelligent management function of the board improves the overall reliability and safety of the power supply system and ensures that the equipment can operate stably at different power levels. The DC voltage-stabilized power supply module is installed at the output end of the charge and discharge control board to adjust the voltage output by the charge and discharge control board to a stable DC power supply to meet the power supply requirements of the CPU central controller. The voltage-stabilizing module has overvoltage and undervoltage protection functions, and can keep the output voltage stable when the input voltage fluctuates to avoid damage to the embedded controller. The DC voltage-stabilized power supply module provides a stable voltage output, ensuring that the CPU central controller can obtain a constant power supply under different environments and load conditions, thereby improving the stability of system operation. At the same time, the overvoltage and undervoltage protection functions increase the anti-interference ability of the power supply system and improve the overall electrical safety of the equipment.

[0066] The combined design of the charge and discharge control board and the DC voltage-stabilized power supply module ensures the reasonable charge and discharge management of the battery and the stable power supply to the CPU central controller. Through intelligent management of the battery power and stable output of the voltage, the equipment can maintain efficient operation under various working conditions, extending the life of the power supply system and improving the reliability and safety of the equipment in complex environments.

[0067] The voltage sensing module 8 includes an electric field sensor 81 and a signal processing unit 82, wherein the electric field sensor 81 monitors the electric field generated by the low-voltage branch line and generates an electric field signal, and the signal processing unit 82 is used to receive the electric field signal transmitted by the electric field sensor 81, generate a voltage trigger signal according to the electric field signal and transmit it to the embedded controller.

[0068] As a possible implementation method, three voltage sensing modules 8 can be provided to realize the detection of ABC phase lines, wherein the voltage sensing module 8 includes an electric field sensor 81 and a signal processing unit 82. The electric field sensor 81 approaches and detects the electric field generated by the low-voltage A phase line, the low-voltage B phase line, and the low-voltage C phase line. At the same time, the electric field sensor 81 transmits the voltage trigger signal to the signal processing unit 82 and transmits it to the embedded controller 6.

[0069] In this embodiment, three voltage sensing modules 8 are provided, which are used to detect the status of low-voltage A-phase, B-phase, and C-phase lines respectively. Such a distribution ensures that the equipment can comprehensively monitor the three-phase lines and improves the accuracy and reliability of fault detection. The electric field sensor 81 approaches and detects the electric field generated by the low-voltage A-phase, B-phase, and C-phase lines. When the line power supply is normal, the electric field sensor 81 will sense a stable electric field strength; when the line fails, the electric field strength will change, and this change will be captured by the electric field sensor 81 and converted into an electrical signal. The electrical signal captured by the electric field sensor 81 is transmitted to the signal processing unit 82 for further processing. The main task of the signal processing unit 82 is to amplify, filter, and shape the original electrical signal to generate a clear and stable voltage trigger signal. This voltage trigger signal is an important basis for the embedded controller 6 to judge the line status. When any one or any two phases of the low-voltage A-phase, B-phase, and C-phase lines fail, the corresponding electric field sensor 81 will detect the change in electric field strength and generate a changing electrical signal. This electrical signal is transmitted to the signal processing unit 82 for amplification, filtering, shaping and other processing, and finally generates a voltage trigger signal. The voltage trigger signal is transmitted to the embedded controller 6, which determines the fault type according to the preset logic and triggers the corresponding alarm mechanism. When the low-voltage A-phase, B-phase and C-phase lines all have power outages, the three electric field sensors 81 will detect changes in the electric field strength. The embedded controller 6 sends an alarm message to the power grid background through the communication module 62 to remind the power supply abnormality (it may be a failure of a nearby substation).

[0070] Specifically, the electric field sensor is used to monitor the changes in the electric field generated in the low-voltage branch line. The electric field sensor is composed of highly sensitive materials and circuits, and can sense the electric field strength of the low-voltage line in real time and generate corresponding electric field signals. The sensor is arranged near the low-voltage branch line to sense the electric field in a non-contact manner, avoiding the electrical safety risks of direct contact. The electric field sensor realizes the precise monitoring of the electric field of the low-voltage branch line. The non-contact design improves the safety of the system and reduces the risk of equipment contacting the power line during installation and use. At the same time, the highly sensitive electric field sensor can quickly respond to changes in the line electric field, providing a fast and accurate basic signal for power outage detection. The signal processing unit is connected to the electric field sensor to receive and process the electric field signal transmitted by the electric field sensor. The signal processing unit adopts circuit designs such as filtering and amplification, which can effectively remove interference signals, enhance the strength of effective signals, and convert them into clear voltage trigger signals. The signal processing unit also has a signal recognition function, which can distinguish small changes in electric field signals to ensure the accuracy of power outage detection. The signal processing unit ensures the stability and accuracy of the sensing data through effective signal processing, providing reliable input signals for subsequent judgments of the embedded controller. Its filtering and amplification functions effectively reduce the impact of environmental noise, improve the system's anti-interference ability, and help achieve high-precision power outage detection.

[0071] Through the cooperation of electric field sensors and signal processing units, the voltage sensing module can perform high-precision, real-time monitoring and signal processing of electric field changes in low-voltage branch lines, and provide accurate power outage detection signals in a timely manner. Non-contact electric field detection improves the installation flexibility and use safety of the equipment, while the efficient signal processing unit further improves the system's anti-interference and detection accuracy, making the overall power outage perception effect of the equipment more reliable and stable.

[0072] like Figure 5 As shown, Figure 5 Schematic diagram of the structure of the pressure sensing module. The voltage sensing module 8 also includes an elastic collar 91, which is installed on the outer side of the voltage sensing module 8 and is used to clamp the low-voltage branch line. The elastic collar 91 also includes a paddle 92, which is installed on the outer side of the elastic collar 91 and is used to control the elastic collar 91.

[0073] Specifically, the elastic collar is installed on the outer side of the voltage sensing module and is made of highly elastic material with good wear resistance and corrosion resistance. The design of the collar enables it to be easily installed on the low-voltage branch line, and the voltage sensing module is firmly fixed by elastic contraction to ensure its close contact with the line, thereby improving the accuracy and stability of the measurement. The use of the elastic collar enables the voltage sensing module to be quickly and easily installed on the low-voltage branch line, avoiding the complexity and safety hazards brought by the traditional fixing method. Its elastic properties ensure that the module can maintain stable contact under temperature changes and vibrations, reducing the risk of poor contact, thereby improving the accuracy and response speed of the measurement.

[0074] The design of the elastic collar provides a reliable fixing solution for the voltage sensing module, which not only improves the installation convenience of the equipment, but also enhances the stability of the measurement. By ensuring the close contact between the sensor and the low-voltage branch line, the module can achieve higher-precision electric field monitoring, enhance the adaptability and reliability of the overall equipment in various environments, and provide a more solid technical foundation for the power outage perception of the low-voltage branch circuit.

[0075] The embedded controller 6 further includes a real-time clock 63 and a memory, wherein the real-time clock 63 is used to generate a clock signal and input it into the CPU central controller 61, and the memory is used to store data generated by the CPU central controller 61. The communication module 62 is used to communicate with the remote server in real time.

[0076] The real-time clock 63 (RTC) is an important component of the embedded controller 6. It provides calendar / clock functions, can continuously and accurately track time, and can maintain the accuracy of time even after the system loses power. The RTC module usually includes a set of programmable counters for timing, and can realize the functions of clock calendar through software configuration. The characteristics of RTC include: being able to run after the MCU loses power and maintain the accuracy of time. It has data storage function and can save data when power is lost. It works independently and does not depend on other parts of the system. At the same time, the memory in the embedded controller 6 is used to store various data and information, including the processing results of the voltage trigger signal, the alarm history, the preset alarm strategy, etc. The memory enables the device to keep some key data in memory after power failure, so as to restore the previous state or continue the unfinished task when the power is turned on again. It also supports the storage of multiple voice information, so that the corresponding voice prompts can be played through the sound and light module when the alarm is sounded. The IO interface of the embedded controller 6 is used to communicate and exchange data with various parts of the device, including the voltage sensing module, the sound and light module, the power module, etc. Through the IO interface, the embedded controller 6 can receive the voltage trigger signal from the voltage sensing module, process the signal and send control instructions to the sound and light module to realize the alarm. At the same time, the IO interface also supports the embedded controller 6 to communicate with the remote server or management platform, upload fault information and receive control instructions.

[0077] In addition, the real-time clock 63 can accurately determine whether it is daytime or nighttime by continuously tracking the current time and comparing it with the preset time period. This function is crucial for adjusting the behavior of the alarm device, because there are usually significant differences in factors such as environmental noise and personnel activities during the day and at night. At night, in order to reduce the impact on surrounding residents, the alarm device can automatically reduce the volume of the broadcast according to the judgment of the real-time clock 63. This can not only ensure that the alarm information can be conveyed in a timely manner, but also minimize noise interference, reflecting the humanized design of the device. The real-time clock 63 can also help the device identify the power consumption valley period at night. During the power consumption valley period, in order to save power resources and reduce unnecessary energy consumption, the alarm device can stop broadcasting and adopt a more energy-saving communication method, such as sending text messages or voice messages to the duty phone of the local unit in the station area. This method not only ensures the timely transmission of alarm information, but also realizes the effective use of energy.

[0078] Specifically, the real-time clock (RTC) module is integrated into the embedded controller and is responsible for generating an accurate clock signal and inputting it into the CPU central controller. The module has the characteristics of low power consumption and high precision, and can continue to maintain the accuracy of time when the device is in a low-power standby state. The real-time clock also has a battery backup function, which can maintain the continuity of time even when the main power is off. By introducing the real-time clock, the device can accurately mark the time when processing and recording events, enhancing the traceability and management capabilities of the data. In the process of power outage perception and alarm, the timestamp can help the system record the exact moment when the event occurred, which is convenient for subsequent data analysis and management. In addition, the low power consumption and battery backup functions ensure the reliability and continuity of the system under different working conditions. The memory module is connected to the CPU central controller to store processing data and system operation status information. The memory adopts non-volatile storage technology, which can save data without losing it even in the case of power failure. The memory capacity is reasonably designed to meet the processing requirements of real-time data and store historical data and configuration files for system recovery and update. The introduction of memory enables the device to have the ability of data persistence and can save important data in the case of power failure or failure. This facilitates equipment troubleshooting, maintenance, and subsequent system optimization. At the same time, the storage of historical data can be used for performance analysis and trend monitoring, helping users evaluate the long-term operation of equipment and improve the intelligence level of the system.

[0079] The integration of real-time clock and memory significantly improves the functionality and reliability of embedded controllers. Through precise clock signals, the device can accurately record event times, while the use of memory ensures data security and integrity. The combination of the two not only improves the system's response speed to events and data management capabilities, but also enhances the intelligence level of the device, making it more practical and maintainable in actual applications.

[0080] Figure 6 The figure is a flow chart of a low-voltage branch line power outage sensing remote alarm method provided according to an embodiment of the present application. Figure 6 As shown, the method includes:

[0081] Step S201, obtaining a voltage trigger signal through a voltage sensing module to obtain a first target signal, and performing band-pass filtering on the first target signal through an embedded controller to obtain a second target signal;

[0082] Specifically, the sampling frequency of the voltage sensing module is configured to be 1000 Hz, based on the actual power distribution conditions of the distribution line to determine that the signal frequency of the AC power is 50 Hz, and the sampling cycle length T is configured to be 20 sampling points based on the sampling frequency and the AC signal frequency. Based on the above data, in order to ensure the accuracy of signal analysis, the analysis window size is configured to be 1000 sampling points, i.e., 50 cycles.

[0083] In a specific implementation, the voltage sensing signal is sampled at the sampling frequency and divided into periods to obtain the first target signal. Further, in order to remove the interference of environmental noise other than the AC signal on the analysis, the present application is configured to filter the first target signal by bandpass filtering to obtain the second target signal.

[0084] Step S202, performing frequency detection on the second target signal with a preset analysis window by the embedded controller, and if the frequency detection passes, calculating the effective signal strength based on the second target signal by the embedded controller and performing dynamic threshold determination on the second target signal according to the effective signal strength;

[0085] Specifically, the second target signal is analyzed based on the set analysis window. First, the filtered signal is frequency detected to ensure that the frequency of the second target signal is close to the center frequency of the bandpass filter. If the signal frequency is correct, the signal is further filtered based on the effective signal strength to remove invalid signals to avoid affecting the determination result.

[0086] Step S203, when the above dynamic threshold is determined to be passed, if the above signal effective strength is less than the preset threshold and lasts for more than a preset time, a target alarm message is issued through the sound and light alarm module.

[0087] Specifically, real-time detection is performed based on the effective strength of the filtered signal. When the effective strength of the signal is less than a certain proportion and lasts for more than a preset time, an alarm is sounded through the sound and light alarm module.

[0088] In a specific embodiment, the preset time length is 50 cycles.

[0089] In order to obtain the second target signal, in an optional implementation manner, the step S201 includes:

[0090] Step S2011, input the first target signal into a bandpass filter to obtain the second target signal:

[0091] y[n]=x[n]*h[n];

[0092] Wherein, y[n] is the second target signal, x[n] is the first target signal, and h[n] is the impulse response of the bandpass filter.

[0093] Specifically, the filtering range of the bandpass filter is configured to be [45, 55] Hz to ensure that the signal is concentrated around the center frequency of 50 Hz (the center frequency is set according to the frequency of the electrical signal). The bandpass filter can be a Butterworth or Chebyshev filter.

[0094] The original signal is processed based on a bandpass filter: y[n]=x[n]*h[n], to obtain the above-mentioned second target signal.

[0095] In order to determine whether the frequency of the second target signal meets the requirement, in an optional implementation, the step S202 includes:

[0096] Step S2021, performing a fast Fourier transform on the second target signal, converting the second target signal into a frequency domain for representation, and obtaining a third target signal:

[0097]

[0098] Wherein, Y[f] is the third target signal, N is the number of sampling points in the preset analysis window, and f is the frequency of the third target signal;

[0099] Specifically, to further ensure the authenticity of the signal, the current analysis window (1000 points) is transformed by FFT to obtain the spectrum of the signal. The spectrum is calculated as The above-mentioned third target signal is obtained.

[0100] Step S2022, based on the above-mentioned third target signal, determine the frequency component corresponding to the maximum amplitude in the spectrum to obtain the target frequency, and when the above-mentioned target frequency is within the filtering range of the above-mentioned bandpass filter, determine that the above-mentioned frequency detection is passed.

[0101] Specifically, find the frequency component f with the largest amplitude in the spectrum peak If f kaep Within the range of 50Hz±5Hz, the signal frequency is judged to meet the requirements.

[0102] In order to ensure the authenticity of the signal, in an optional implementation, the above step S202 further includes:

[0103] Step S2023, calculating the effective value based on the second target signal to obtain the effective strength of the signal:

[0104]

[0105] Wherein, k is the serial number of the cycle, T is the number of sampling points in the cycle, K is the total number of cycles, and RSK[K] is the effective strength of the above signal;

[0106] Specifically, the signal strength is quantified based on RMS (effective value). Based on the above embodiment, there are 20 sampling points in each cycle, and each cycle is calculated according to the formula: An RMS calculation is performed to obtain the above-mentioned signal effective strength used to characterize the signal strength.

[0107] Step S2024: Based on the above signal effective strength, determine the first threshold and the second threshold:

[0108]

[0109] Among them, Th high is the first threshold, Th low is the second threshold, is the mean of the effective strength of the above signal, σ is the standard deviation of the environmental noise;

[0110] Specifically, based on the dynamic threshold, the determination of whether a signal exists is performed. First, the update relationship between the dynamic thresholds for setting the signal effective strength is configured, that is, the first threshold and the second threshold, wherein the first threshold is the upper threshold and the second threshold is the lower threshold.

[0111] Step S2025, when the effective signal strength is greater than or equal to the first threshold, determining that the second target signal exists;

[0112] Step S2026, when the effective signal strength is less than or equal to the second threshold, determining that the second target signal disappears;

[0113] Step S2027, when the effective signal strength is greater than the second threshold and less than the first threshold, determining that the second target signal is weak;

[0114] Step S2028: When the signal strength of the second target signal is present or relatively weak, determine that the dynamic threshold value is passed.

[0115] In order to achieve dynamic determination based on the power transmission signal, in an optional implementation, if the effective strength of the above signal is less than a preset threshold and lasts for more than a preset time, before the target alarm information is issued through the sound and light alarm module, the above method also includes:

[0116] Step S301, calculating the product of the above-mentioned effective signal strength and the preset ratio to obtain the above-mentioned preset threshold.

[0117] Specifically, the present application sets the power outage threshold, that is, the above-mentioned preset threshold, to 10% of the normal RMS, which is used to determine whether the power transmission is interrupted, that is, whether a power outage is sounded.

[0118] In a specific implementation, when the RMS drops below the power outage threshold and lasts for one analysis cycle, it is determined that a power outage has occurred and an alarm is issued.

[0119] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0120] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low-voltage branch circuit power outage sensing and alarm device, characterized in that: The device comprises: A voltage sensing module is installed on a low-voltage branch line, the voltage sensing module is used to sense the electric field generated by the low-voltage branch line and output a voltage trigger signal, the voltage sensing module includes an electric field sensor and a signal processing unit, wherein the electric field sensor monitors the electric field generated by the low-voltage branch line and generates an electric field signal, the signal processing unit is used to receive the electric field signal transmitted by the electric field sensor, generate a voltage trigger signal according to the electric field signal and transmit it to the embedded controller, the low-voltage branch line includes a low-voltage A-phase line, a low-voltage B-phase line and a low-voltage C-phase line; The embedded controller is electrically connected to the voltage sensing module, and includes a CPU central controller and a communication module, wherein the CPU central controller is used to receive the voltage trigger signal and confirm whether the low-voltage branch line is powered off, and the communication module is used to communicate with the remote server in real time, and the embedded controller also includes a real-time clock and a memory, wherein the real-time clock is used to generate a clock signal and input it into the CPU central controller, and the memory is used to store data generated by the CPU central controller; A power module is electrically connected to the voltage sensing module, the embedded controller and the sound and light alarm module, the power module includes a photovoltaic panel, a battery and a power control board, wherein the photovoltaic panel is used to generate electricity and charges the battery after conversion by the power control board, the battery is used to supply power to the voltage sensing module, the embedded controller and the sound and light alarm module, the power control board includes a charge and discharge control board and a DC regulated power supply module, wherein the output end of the charge and discharge control board is connected to the input end of the DC regulated power supply module, and the output end of the DC regulated power supply module is connected to the input end of the CPU central controller; An equipment box, wherein the embedded controller, the storage battery and the power control board are all installed inside the equipment box and the photovoltaic panel is installed obliquely on the top of the equipment box; The sound and light alarm module is electrically connected to the embedded controller, and is used to receive a power outage alarm signal issued by the embedded controller to trigger a sound and light alarm, wherein the waterproof speakers of the sound and light alarm module are installed on both sides of the equipment box, and the warning light of the sound and light alarm module is installed on one side of the equipment box.

2. The device according to claim 1, characterized in that The back side of the equipment box is mounted on a plurality of mounting brackets, and the mounting brackets are used to fix the equipment box.

3. The device according to claim 1, characterized in that The low-voltage branch circuit power outage sensing alarm device also includes a sensor connector, which is installed at the bottom of the device box and connected between the embedded controller and the voltage sensing module. The sensor connector is used to achieve electrical connection between the voltage sensing module and the embedded controller.

4. The device according to claim 1, characterized in that The voltage sensing module further comprises an elastic clamping ring, which is mounted on the outer side of the voltage sensing module and is used for clamping the low-voltage branch line.

5. The device according to claim 4, characterized in that The elastic clamp ring further comprises a paddle, which is mounted on the outer side of the elastic clamp ring and is used to control the elastic clamp ring.

6. A low-voltage branch circuit power outage sensing and alarm method, characterized in that: The method is applied to the low-voltage branch circuit power outage sensing and alarm device according to any one of claims 1 to 5, and the method comprises: Acquire a voltage trigger signal through a voltage sensing module to obtain a first target signal, and perform bandpass filtering on the first target signal through an embedded controller to obtain a second target signal; Performing frequency detection on the second target signal with a preset analysis window by the embedded controller, and if the frequency detection passes, calculating the signal effective strength based on the second target signal by the embedded controller and performing dynamic threshold determination on the second target signal according to the signal effective strength; In the case where the dynamic threshold is determined to be passed, if the effective signal strength is less than a preset threshold and lasts for more than a preset time, a target alarm message is issued through the sound and light alarm module.

7. The method according to claim 6, characterized in that Performing bandpass filtering on the first target signal through an embedded controller to obtain a second target signal includes: The first target signal is input into a bandpass filter to obtain the second target signal: y[n]=x[n]*h[n]; Wherein, y[n] is the second target signal, x[n] is the first target signal, and h[n] is the impulse response of the bandpass filter.

8. The method according to claim 7, characterized in that Performing frequency detection on the second target signal using a preset analysis window by the embedded controller includes: Perform a fast Fourier transform on the second target signal, convert the second target signal into the frequency domain for representation, and obtain a third target signal: Wherein, Y[f] is the third target signal, N is the number of sampling points in the preset analysis window, and f is the frequency of the third target signal; Based on the third target signal, a frequency component corresponding to the maximum amplitude in the spectrum is determined to obtain a target frequency. If the target frequency is within the filtering range of the bandpass filter, it is determined that the frequency detection is passed.

9. The method according to claim 7, characterized in that: Calculating the effective signal strength based on the second target signal by the embedded controller and performing a dynamic threshold determination on the second target signal according to the effective signal strength, including: Calculate the effective value based on the second target signal to obtain the signal effective strength: Wherein, k is the serial number of the cycle, T is the number of sampling points in the cycle, K is the total number of cycles, and RSK[K] is the effective strength of the signal; Based on the effective signal strength, a first threshold and a second threshold are determined: Among them, Th high is the first threshold, Th low is the second threshold, is the mean value of the effective signal strength, σ is the standard deviation of the environmental noise; When the effective signal strength is greater than or equal to the first threshold, determining that the second target signal exists; When the effective signal strength is less than or equal to the second threshold, determining that the second target signal disappears; When the effective signal strength is greater than the second threshold and less than the first threshold, determining that the second target signal is weak; When the signal strength of the second target signal is present or relatively weak, it is determined that the dynamic threshold value is passed.

10. The method according to claim 7, characterized in that If the effective strength of the signal is less than a preset threshold and lasts for more than a preset time, before the target alarm information is issued by the sound and light alarm module, the method further includes: The product of the effective signal strength and the preset ratio is calculated to obtain the preset threshold.

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