A fire automatic control device of mountain photovoltaic inverter
By integrating infrared temperature probes, explosion-proof smoke sensors, and arc grating filters into mountain photovoltaic inverters, along with positioning and communication modules, the problems of inaccurate fire location and signal loss in mountain photovoltaic inverters have been solved, achieving rapid response and stable transmission, and reducing fire losses.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- THREE GORGES NEW ENERGY PINGDING POWER GENERATION CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-06-12
AI Technical Summary
Mountain photovoltaic inverters are susceptible to dust interference in strong wind environments, which can lead to false alarms, inaccurate fire location, and easy signal loss, delaying fire fighting and rescue opportunities, resulting in economic losses and safety hazards.
It employs a composite detector combined with an infrared temperature probe, an explosion-proof smoke sensor, and an arc grating filter. Through positioning and communication modules, it achieves high-precision positioning and stable signal transmission, and is equipped with a mechanical linkage fire extinguishing mechanism for rapid response.
It improves the accuracy and timeliness of fire monitoring, ensures stable transmission of alarm signals, enables rapid response and control of fires, and reduces losses.
Smart Images
Figure CN224354894U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic technology, specifically to a fire control device for a mountain photovoltaic inverter. Background Technology
[0002] A photovoltaic (PV) inverter (or solar inverter) converts the variable DC voltage generated by photovoltaic (PV) solar panels into AC power at the mains frequency. This AC power can be fed back into commercial transmission systems or supplied to off-grid power grids. With the widespread construction and application of mountain PV power plants, the fire safety of inverters, as key equipment, has become increasingly prominent.
[0003] In existing technologies, traditional smoke detectors are highly susceptible to dust interference in mountainous and windy environments, leading to frequent false alarms and severely impacting the normal operation and management of equipment. Due to the complex structure of inverters, ignition points are often concealed, making it difficult for maintenance personnel to accurately locate faulty equipment immediately after a fire breaks out, thus delaying firefighting and rescue efforts. Furthermore, in mountainous environments with poor signal coverage, alarm information is easily lost and cannot be promptly transmitted to the control room, resulting in an inability to take swift countermeasures and potentially causing serious economic losses and safety hazards. Utility Model Content
[0004] In view of this, the present invention provides a fire control device for a mountain photovoltaic inverter, which can realize rapid fire monitoring and location, and improve response speed.
[0005] In the first aspect, this utility model provides a fire control device for a mountain photovoltaic inverter. The fire control device includes a composite detector (1) and a control box (2) connected together. The composite detector (1) includes an infrared temperature probe (11), an explosion-proof smoke sensor (12), and an arc grating filter (13) stacked from top to bottom. The control box (2) includes a positioning module (21) and a communication module (22). The positioning module (21) and the communication module (22) are connected. The infrared temperature probe (11), the explosion-proof smoke sensor (12), and the arc grating filter (13) are respectively connected to the positioning module (21). The infrared temperature probe (11), the explosion-proof smoke sensor (12), and the arc grating filter (13) are respectively connected to the communication module (22).
[0006] In this implementation, the fire situation is detected by multiple sensors in combination, which can improve the accuracy and timeliness of fire monitoring, enable a rapid response in the early stage of a fire, and buy valuable time for subsequent rescue. Through the positioning module and communication module, high-precision positioning is guaranteed, and the alarm signal is transmitted stably and reliably, which solves the drawbacks of inaccurate positioning and easy signal loss in the existing technology.
[0007] In one alternative implementation, the housing of the composite detector (1) is a metal cavity with a preset protection level.
[0008] In this implementation, the reliable structure enhances the applicability and stability of the device in harsh mountainous environments by using a pre-set protection level shell.
[0009] In one optional embodiment, the number of infrared temperature probes (11) is five, and the five infrared temperature probes (11) are arranged in a ring, with the distance between adjacent infrared temperature probes (11) being less than or equal to 30 mm.
[0010] In one alternative implementation, the explosion-proof smoke sensor (12) is installed at a tilt angle of 15°.
[0011] In one alternative embodiment, the arc grating filter (13) is provided with a protective mesh, which is made of 304 stainless steel.
[0012] In one alternative implementation, the positioning module (21) includes a BeiDou positioning device and a Global Positioning System positioning device.
[0013] In one optional implementation, the communication module (22) is a dual-channel communication module (22) for LoRa signals and 4G signals. The dual-channel communication module (22) has a built-in signal strength automatic selection circuit and a signal strength comparator. The signal strength comparator is used to compare the signal strength of LoRa signals and 4G signals, and the signal strength automatic selection circuit is used to automatically switch between LoRa signal transmission mode and 4G signal transmission mode.
[0014] In this implementation, the dual-channel communication module, combined with the automatic signal strength selection circuit, ensures that the alarm signal can be transmitted stably in the complex signal environment of mountainous areas, thus avoiding information loss.
[0015] In one alternative implementation, the communication module (22) incorporates a built-in capacitor energy storage unit.
[0016] In one optional embodiment, the fire control device further includes a mechanical linkage fire extinguishing mechanism (3) connected to the composite detector (1). The mechanical linkage fire extinguishing mechanism (3) includes a fire extinguishing agent storage tank (31), a solenoid valve (32), and a fire extinguishing nozzle (33). The fire extinguishing agent storage tank (31) is directly connected to the solenoid valve (32), and the fire extinguishing nozzle (33) is connected to the solenoid valve (32) through a universal joint.
[0017] In one optional embodiment, the fire extinguishing nozzle (33) is a wide-angle nozzle with an angle of 120°, and the spray coverage area of the fire extinguishing nozzle (33) is greater than 0.8 square meters; the spray angle adjustment range is 90°-150°.
[0018] In this implementation, the mechanically linked fire extinguishing mechanism can quickly initiate the fire extinguishing procedure at the same time as the alarm is triggered. The wide-angle nozzle and adjustable spray angle design can effectively cover the fire area, extinguish the fire in time, and reduce losses. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of a fire control device for a mountain photovoltaic inverter according to an embodiment of the present utility model;
[0021] Figure 2 This is a schematic diagram of the transmission mode of a communication module according to an embodiment of the present utility model;
[0022] Figure 3 This is a schematic diagram of a fire control device for a mountain photovoltaic inverter according to another embodiment of the present utility model;
[0023] Figure 4 This is a flowchart of a fire self-control alarm method for a mountain photovoltaic inverter according to an embodiment of the present utility model.
[0024] Explanation of reference numerals in the attached figures:
[0025] 1. Composite detector; 2. Control box; 3. Mechanical linkage fire extinguishing mechanism; 11. Infrared temperature probe; 12. Explosion-proof smoke sensor; 13. Arc grating filter; 21. Positioning module; 22. Communication module; 31. Fire extinguishing agent storage tank; 32. Solenoid valve; 33. Fire extinguishing nozzle. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0029] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0030] According to an embodiment of this utility model, a fire control device for a mountain photovoltaic inverter is provided. This device can organically combine an infrared temperature probe, an explosion-proof smoke sensor, and an arc grating filter to detect fire conditions, thereby improving the accuracy and timeliness of fire monitoring. It can respond quickly in the early stages of a fire, buying valuable time for subsequent rescue efforts. Through the positioning module and communication module, it ensures both high-precision positioning and stable and reliable transmission of alarm signals, solving the shortcomings of inaccurate positioning and easy signal loss in the prior art.
[0031] Please see Figure 1 , Figure 1 This is a schematic diagram of a fire control device for a mountain photovoltaic inverter according to an embodiment of the present invention. The fire control device includes a connected composite detector (1) and a control box (2).
[0032] The composite detector (1) is used to detect environmental parameter information near the photovoltaic inverter and to determine whether a fire may occur based on the environmental parameter information.
[0033] The housing of the composite detector (1) is a metal cavity with a preset protection level, and the dimensions of the metal cavity are 120×80×50mm. For example, the housing of the composite detector (1) is a metal cavity with an IP67 protection level.
[0034] The composite detector (1) has an infrared temperature probe (11), an explosion-proof smoke sensor (12), and an arc grating filter (13) stacked from top to bottom inside.
[0035] The infrared temperature probe (11) is used to detect the ambient temperature around the inverter. When the ambient temperature is greater than the preset temperature, it is determined that the photovoltaic inverter may be on fire.
[0036] In one implementation, there are five infrared temperature probes (11), which are arranged in a ring inside the composite detector (1), with the distance between adjacent infrared temperature probes (11) being less than or equal to 30 mm. The ring arrangement of the infrared temperature probes (11) enables all-round monitoring of the inverter's temperature changes and timely detection of abnormal temperature conditions.
[0037] When the number of infrared temperature probes (11) whose ambient temperature is greater than the preset temperature is greater than the preset number, it is determined that the photovoltaic inverter may be on fire.
[0038] For example, when any two infrared temperature probes (11) detect an ambient temperature greater than 120°, it is determined that the photovoltaic inverter may be in danger of fire.
[0039] The explosion-proof smoke sensor (12) is used to detect the smoke concentration around the inverter. When the smoke concentration is greater than the preset concentration, it is determined that the photovoltaic inverter may be on fire.
[0040] For example, when the smoke concentration detected by the explosion-proof smoke sensor (12) is greater than 5%obs / m, it is determined that the photovoltaic inverter may be on fire.
[0041] In one implementation, the explosion-proof smoke sensor (12) is installed at a tilt angle of 15°, which can effectively prevent dust interference and ensure the accuracy of smoke detection.
[0042] The arc grating filter (13) is used to detect the arc light intensity around the inverter. When the arc light intensity is greater than the preset light intensity for a longer period than the preset duration, it is determined that the photovoltaic inverter may be on fire. It can quickly identify fire hazards caused by arc faults.
[0043] For example, when the arc grating filter (13) detects that the arc light intensity exceeds 3000 lux for 0.5s, it determines that the photovoltaic inverter may be on fire.
[0044] In one implementation, a protective mesh is provided on the arc grating filter, and the protective mesh is made of 304 stainless steel.
[0045] In addition, this utility model has also been optimized in terms of mechanical anti-false alarm design and structural protection. With an IP67 protection level shell and a reliable structure that has passed vibration test standards, the applicability and stability of the device in harsh mountainous environments have been enhanced.
[0046] In one specific implementation, an alarm is triggered when at least two of the infrared temperature probe (11), the explosion-proof smoke sensor (12), and the arc grating filter (13) detect a possible fire.
[0047] In terms of fire detection, this utility model employs a stacked sensor module design, organically combining an infrared temperature probe, an explosion-proof smoke sensor, and an arc grating filter. Coupled with a unique three-level triggering mechanism, it not only effectively avoids the problem of dust interference in traditional detection methods but also significantly improves the accuracy and timeliness of fire detection. It can respond quickly in the early stages of a fire, buying valuable time for subsequent rescue efforts.
[0048] The control box (2) includes a positioning module (21) and a communication module (22). The positioning module (21) and the communication module (22) are connected. The infrared temperature probe (11), the explosion-proof smoke sensor (12), and the arc grating filter (13) are respectively connected to the positioning module (21). The infrared temperature probe (11), the explosion-proof smoke sensor (12), and the arc grating filter (13) are respectively connected to the communication module (22).
[0049] The positioning module (21) is used to automatically activate the positioning function and obtain the coordinate data of the photovoltaic inverter when a potential fire is detected. The coordinate data includes the longitude, latitude, and altitude of the photovoltaic inverter.
[0050] In one implementation, the positioning module (21) includes a BeiDou positioning device and a Global Positioning System positioning device, combined with a BeiDou / GPS dual-mode positioning chip, to accurately acquire the coordinate data of the photovoltaic inverter. In mountainous environments, the positioning accuracy is less than or equal to 2 meters, enabling maintenance personnel to quickly and accurately locate faulty equipment and promptly carry out fire suppression and repairs.
[0051] Understandably, different photovoltaic inverters are set up in multiple areas of the mountainous region, and each photovoltaic inverter has a unique equipment number. Based on the coordinate data of the photovoltaic inverters, the equipment number of the photovoltaic inverter that caught fire can be determined, which can be used for subsequent analysis of that model of photovoltaic inverter.
[0052] The communication module (22) is used to send alarm information and coordinate information of the photovoltaic inverter to the main control room. Furthermore, the communication module (22) can also send the device number of the photovoltaic inverter to the main control room.
[0053] In one implementation, the communication module (22) is a dual-channel communication module (22) for both LORA and 4G signals.
[0054] LORA (Long Range Radio) is a wireless communication standard based on spread spectrum technology.
[0055] The dual-channel communication module (22) has a built-in signal strength automatic selection circuit and a signal strength comparator. The signal strength comparator is used to compare the signal strength of LoRa signal and 4G signal, and the signal strength automatic selection circuit is used to automatically switch between LoRa signal transmission mode and 4G signal transmission mode.
[0056] Please see Figure 2 , Figure 2 This is a schematic diagram of the transmission mode of a communication module according to an embodiment of the present utility model.
[0057] The dual-channel communication module also includes a communication power supply, which powers the automatic signal strength selection circuit and the signal strength comparator. The signal strength comparator compares the signal strength of the LoRa signal and the 4G signal. When the signal strength of the 4G signal is less than the preset signal strength, the main control chip in the automatic signal strength selection circuit automatically switches to the LoRa signal transmission mode and uses the LoRa frequency band wireless interface for data transmission. When the signal strength of the 4G signal is greater than or equal to the preset signal strength, the main control chip in the automatic signal strength selection circuit automatically switches to the 4G signal transmission mode and uses the 4G frequency band wireless interface for data transmission.
[0058] For example, the preset signal strength is -90dBm.
[0059] In another implementation, the communication module (22) has a built-in capacitor energy storage unit. The capacitor energy storage unit is connected to the signal strength automatic selection circuit and the signal strength comparator. After the power is cut off, it supplies power to the signal strength automatic selection circuit and the signal strength comparator. It can still maintain signal transmission for 20 minutes after the power is cut off, ensuring that the alarm signal can be successfully transmitted to the main control room in the event of a sudden power failure.
[0060] In terms of positioning and communication functions, the Beidou / GPS dual-mode positioning chip works in concert with the LoRa and 4G dual-channel communication module, enabling the device to ensure high-precision positioning and stable and reliable transmission of alarm signals in complex mountainous environments, thus solving the shortcomings of inaccurate positioning and easy signal loss in the prior art.
[0061] Please see Figure 3 , Figure 3This is a schematic diagram of a fire control device for a mountain photovoltaic inverter according to another embodiment of the present invention. The fire control device includes a composite detector (1), a control box (2), and a mechanical linkage fire extinguishing mechanism (3). The composite detector (1) is connected to the control box (2) and the mechanical linkage fire extinguishing mechanism (3) respectively.
[0062] The mechanical linkage fire extinguishing mechanism (3) is used to automatically start and extinguish fire when a possible fire is detected.
[0063] The mechanical linkage fire extinguishing mechanism (3) includes a fire extinguishing agent storage tank (31), a solenoid valve (32) and a fire extinguishing nozzle (33). The fire extinguishing agent storage tank (31) is directly connected to the solenoid valve (32), and the fire extinguishing nozzle (33) is connected to the solenoid valve (32) through a universal joint.
[0064] In one implementation, the fire extinguishing agent storage tank (31) has a capacity of 500 ml.
[0065] In one implementation, the fire extinguishing nozzle (33) is a wide-angle nozzle with an angle of 120°, and the spray coverage area of the fire extinguishing nozzle (33) is greater than 0.8 square meters. For example, the fire extinguishing nozzle (33) is a wide-angle stainless steel fan-shaped nozzle.
[0066] In one implementation, the solenoid valve (32) adjusts the spray angle of the fire extinguishing nozzle (33) through a universal joint. The spray angle adjustment range is 90°-150°, which can effectively cover the fire area, extinguish the fire in time, and reduce losses.
[0067] In one implementation, the solenoid valve (32) is equipped with a manual reset safety bolt. When the solenoid valve (32) is closed, it can only be restarted after the safety bolt is physically moved, which effectively avoids misoperation and prevents false alarms from causing the fire extinguishing mechanism to be activated.
[0068] In another possible implementation, the control box (2) also includes a fire analysis module, which is connected to the infrared temperature probe (11), explosion-proof smoke sensor (12) and arc grating filter (13) in the composite detector (1) to analyze the current fire type and severity based on the ambient temperature data, smoke concentration data and arc light intensity data detected by the infrared temperature probe (11), explosion-proof smoke sensor (12) and arc grating filter (13).
[0069] The fire analysis module is connected to the communication module (22) and is used to transmit the current fire type and fire severity to the main control room through the communication module (22), so that the main control room can quickly understand the specific equipment, location and fire type of the fire and take corresponding rescue measures in a timely manner.
[0070] In terms of fire extinguishing function, this utility model is equipped with a mechanical linkage fire extinguishing mechanism, which, together with an adjustable wide-angle nozzle, realizes automatic fire extinguishing when a fire occurs, can quickly control the fire and reduce fire losses.
[0071] Based on this, this embodiment provides a fire alarm method for a mountain photovoltaic inverter, which is applied to the aforementioned fire control device. Figure 4 This is a flowchart of a fire alarm method for a mountain photovoltaic inverter according to an embodiment of the present invention. It should be noted that if substantially the same result is achieved, this embodiment does not necessarily reflect that. Figure 4 The illustrated process sequence is limited. For example... Figure 4 As shown, the process includes the following steps:
[0072] Step S401: Obtain environmental data around the photovoltaic inverter.
[0073] The environmental data surrounding the photovoltaic inverter includes ambient temperature, smoke concentration, and electric arc intensity.
[0074] The ambient temperature around the inverter is detected by an infrared temperature probe (11), the smoke concentration around the inverter is detected by an explosion-proof smoke sensor (12), and the arc light intensity around the inverter is detected by an arc grating filter (13).
[0075] Step S402: Determine whether a fire has occurred based on environmental data around the photovoltaic inverter.
[0076] This application uses a three-level triggering mechanism for fire detection. At least two infrared temperature sensors (11) detect an ambient temperature greater than 120°C, an explosion-proof smoke sensor (12) detects a smoke concentration greater than 5%obs / m, and an arc grating filter (13) detects an arc light intensity exceeding 3000 lux for 0.5s. When at least two of the above three conditions are met, it is determined that the inverter is on fire and a fire warning is required.
[0077] Step S403: When a fire occurs, obtain the location information of the photovoltaic inverter and generate alarm information.
[0078] When a fire is detected, the positioning function of the positioning module (21) is automatically activated, and the coordinate data of the photovoltaic inverter is accurately obtained by combining the Beidou / GPS dual-mode positioning chip.
[0079] Furthermore, the device number of the photovoltaic inverter is determined by combining the coordinate data of the photovoltaic inverter, and the device number and coordinate data are used as alarm information.
[0080] Furthermore, by combining the fire analysis module, the current fire type and severity are determined based on the environmental data around the photovoltaic inverter, and the equipment number, coordinate data, current fire type, and fire severity are used as alarm information.
[0081] Step S404: Transmit the alarm information to the main control room.
[0082] The signal strength comparator compares the signal strength of LoRa and 4G signals. When the 4G signal strength is lower than the preset signal strength, the main control chip in the automatic signal strength selection circuit automatically switches to LoRa signal transmission mode, using the LoRa wireless interface to transmit data and send the alarm information to the main control room. When the 4G signal strength is greater than or equal to the preset signal strength, the main control chip in the automatic signal strength selection circuit automatically switches to 4G signal transmission mode, using the 4G wireless interface to transmit data and send the alarm information to the main control room.
[0083] In another implementation, when a fire is detected, a mechanical linkage fire extinguishing mechanism (3) is used to extinguish the fire.
[0084] This utility model addresses fire prevention and control for inverters in mountainous photovoltaic power stations. Through innovative structural design and functional integration, it proposes a fire self-control device for mountainous photovoltaic inverters. By combining multiple sensors for fire detection, a three-level triggering mechanism is proposed to improve the accuracy of fire detection and increase the initial response speed. Through the cooperation of a dual-mode positioning system and a dual-channel communication system, high-precision positioning and stable and reliable alarm signal transmission are ensured in complex mountainous environments. By incorporating fire extinguishing devices, automatic fire suppression is achieved when a fire occurs, enabling rapid control of the fire and reducing fire losses.
[0085] This invention effectively overcomes the shortcomings of traditional technologies and significantly improves the overall effectiveness of fire prevention and control for mountain photovoltaic inverters. It is of great significance for ensuring the safe and stable operation of mountain photovoltaic power stations and reducing fire risks. It has good application value and broad market prospects, and is expected to bring new development and changes to the field of photovoltaic equipment safety technology.
[0086] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A fire control device for a mountain photovoltaic inverter, characterized in that, The fire control device includes a composite detector (1) and a control box (2) connected together. The composite detector (1) includes an infrared temperature probe (11), an explosion-proof smoke sensor (12), and an arc grating filter (13) stacked from top to bottom. The control box (2) includes a positioning module (21) and a communication module (22). The positioning module (21) and the communication module (22) are connected. The infrared temperature probe (11), the explosion-proof smoke sensor (12), and the arc grating filter (13) are respectively connected to the positioning module (21). The infrared temperature probe (11), the explosion-proof smoke sensor (12), and the arc grating filter (13) are respectively connected to the communication module (22).
2. The fire control device for a mountain photovoltaic inverter according to claim 1, characterized in that, The outer shell of the composite detector (1) is a metal cavity with a preset protection level.
3. The fire control device for a mountain photovoltaic inverter according to claim 1, characterized in that, The number of infrared temperature measuring probes (11) is five, and the five infrared temperature measuring probes (11) are arranged in a ring, with the distance between adjacent infrared temperature measuring probes (11) being less than or equal to 30mm.
4. The fire control device for a mountain photovoltaic inverter according to claim 1, characterized in that, The installation tilt angle of the explosion-proof smoke sensor (12) is 15°.
5. The fire control device for a mountain photovoltaic inverter according to claim 1, characterized in that, The arc grating filter (13) is provided with a protective mesh, which is made of 304 stainless steel.
6. The fire control device for a mountain photovoltaic inverter according to claim 1, characterized in that, The positioning module (21) includes a Beidou positioning device and a Global Positioning System positioning device.
7. The fire control device for a mountain photovoltaic inverter according to claim 1, characterized in that, The communication module (22) is a dual-channel communication module (22) for LoRa signals and 4G signals. The dual-channel communication module (22) has a built-in signal strength automatic selection circuit and a signal strength comparator. The signal strength comparator is used to compare the signal strength of LoRa signals and 4G signals. The signal strength automatic selection circuit is used to automatically switch between LoRa signal transmission mode and 4G signal transmission mode.
8. The fire control device for a mountain photovoltaic inverter according to claim 7, characterized in that, The communication module (22) has a built-in capacitor energy storage unit.
9. The fire control device for a mountain photovoltaic inverter according to claim 1, characterized in that, The fire control device also includes a mechanical linkage fire extinguishing mechanism (3), which is connected to the composite detector (1). The mechanical linkage fire extinguishing mechanism (3) includes a fire extinguishing agent storage tank (31), a solenoid valve (32), and a fire extinguishing nozzle (33). The fire extinguishing agent storage tank (31) is directly connected to the solenoid valve (32), and the fire extinguishing nozzle (33) is connected to the solenoid valve (32) through a universal joint.
10. The fire control device for a mountain photovoltaic inverter according to claim 9, characterized in that, The fire extinguishing nozzle (33) is a wide-angle nozzle with an angle of 120°. The spray coverage area of the fire extinguishing nozzle (33) is greater than 0.8 square meters. The spray angle adjustment range is 90°-150°.