Lightning protection filter circuit, system and electronic equipment
By designing a multi-layered lightning protection filter circuit and detecting its status, the problem of startup delay in lightning protection devices has been solved, achieving more effective lightning protection, especially in the case of high-frequency lightning, ensuring the safety of electronic equipment.
Patent Information
- Application Number
- CN202421080514.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-05-17
AI Technical Summary
Existing surge protection circuits have a delay in the activation response time of surge protection devices, which makes it impossible to protect electronic equipment in time during the initial stage of lightning intrusion, and the protection effect is poor under high-frequency lightning conditions.
The circuit employs a multi-layered lightning protection filter design, which includes multiple lightning protection devices and inductors. The inductors prevent lightning signals from passing through before the lightning protection devices are activated, and quickly absorb overvoltage and overcurrent after the devices are activated. Combined with a status detection sensor, the status of the devices is monitored to ensure timely replacement.
It improves the protection effect of lightning protection circuits in the early stage of lightning intrusion, reduces equipment damage, enhances the protection capability against high-frequency lightning, and ensures the reliable operation of devices through status detection.
Smart Images
Figure CN223797917U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of lightning protection structure technology, and in particular relates to a lightning protection filter circuit, system and electronic equipment. Background Technology
[0002] With the rapid development of modern electronic technology, various electronic devices have been widely used in various fields. However, lightning, as a common natural phenomenon, often poses a serious threat to electronic equipment due to the overvoltage and overcurrent it generates, leading to equipment damage, data loss, and even personal injury. Therefore, lightning protection technology is crucial for protecting the safe operation of electronic equipment.
[0003] Current surge protection circuits employ various surge protection devices, such as SPDs (Surge Protective Devices), but their effectiveness still falls short in practical applications. This is primarily due to the inherent delay in the activation response time of SPDs and similar devices, resulting in insufficient and ineffective protection during the initial stages of lightning strikes. Furthermore, the protective performance of SPDs and similar devices is also affected at higher lightning frequencies.
[0004] Therefore, how to improve the lightning protection effect of lightning protection filter circuits is a problem that needs to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of this application is to provide a lightning protection filter circuit, system, and electronic device, which aims to solve the problem of poor lightning protection effect of traditional lightning protection filter circuits.
[0006] The first aspect of this application provides a lightning protection filter circuit, comprising:
[0007] A first power line, wherein a first inductor is provided on the first power line;
[0008] Second power supply line;
[0009] At least one surge protection device, the at least one surge protection device including a first surge protection device, one end of the first surge protection device being connected to the first power line and the other end being connected to the second power line;
[0010] The first power line has a first input terminal for lightning signal input, and one end of the first lightning protection device is connected between the first input terminal and the first inductor.
[0011] In some embodiments of this application, a second inductor is provided on the second power line, and the second power line has a second input terminal for lightning signal input. One end of the first surge protector is connected between the second input terminal and the second inductor.
[0012] In some embodiments of this application, the first power line further has a third input terminal for lightning signal input, and the first inductor is disposed between the first input terminal and the third input terminal; at least one of the lightning protection devices further includes a second lightning protection device, one end of which is connected between the third input terminal and the first inductor, and the other end is connected to the second power line.
[0013] In some embodiments of this application, the second power line further has a fourth input terminal for lightning signal input, the second inductor is disposed between the second input terminal and the fourth input terminal, and the other end of the second lightning protection device is connected between the fourth input terminal and the second inductor.
[0014] In some embodiments of this application, the lightning protection filter circuit further includes a third power line, and at least one of the lightning protection devices further includes a third lightning protection device. One end of the third lightning protection device is connected to the lightning protection grounding point of the second power line along with the first lightning protection device, and the other end of the third lightning protection device is connected to the third power line.
[0015] In some embodiments of this application, a third inductor is provided on the third power line, the third power line has a fifth input terminal for lightning signal input, and the other end of the third lightning protection device is connected between the fifth input terminal and the third inductor.
[0016] In some embodiments of this application, the third power line further has a sixth input terminal for lightning signal input, and the third inductor is disposed between the fifth input terminal and the sixth input terminal; at least one of the lightning protection devices further includes a fourth lightning protection device, one end of which is connected to the lightning protection grounding point, and the other end is connected between the third inductor and the sixth input terminal.
[0017] In some embodiments of this application, the other end of the second lightning protection device is connected to the lightning protection grounding point.
[0018] In some embodiments of this application, the lightning protection filter circuit further includes a status detection sensor, which is used to detect the operating status of at least one of the lightning protection devices.
[0019] In some embodiments of this application, the state detection sensor includes at least one of a temperature sensor, a remote signaling monitoring sensor, and a leakage current monitoring sensor.
[0020] Secondly, this application also provides a lightning protection filtering system, including the above-mentioned lightning protection filtering circuit and a signal processing terminal. The lightning protection filtering circuit includes a status detection sensor for monitoring the status of at least one lightning protection device. The signal processing terminal is used to acquire the monitoring data of the status detection sensor and output a processing signal based on the monitoring data. The processing signal is used to characterize the working status of at least one lightning protection device.
[0021] Thirdly, this application also provides an electronic device, including a circuit board on which the above-mentioned lightning protection filtering circuit is integrated.
[0022] The beneficial effects of this utility model embodiment compared with the prior art are as follows: The above-mentioned lightning protection filter circuit, system and electronic device includes a first power line, a second power line and at least one lightning protection device; a first inductor is provided on the first power line; at least one lightning protection device includes a first lightning protection device, one end of which is connected to the first power line and the other end of which is connected to the second power line; the first power line has a first input terminal for lightning signal input, and one end of the first lightning protection device is connected between the first input terminal and the first inductor; the first lightning protection device of this application can discharge current and clamp the voltage within the protection voltage range; however, since the first lightning protection device has a certain start-up time, when a lightning signal invades from the first input terminal, the first inductor can generate a directional electromotive force and impede the current flow, so as to play a certain lightning protection role during the start-up time of the first lightning protection device, thereby helping to increase the lightning protection effect of the lightning protection filter circuit. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of a lightning protection filter circuit provided in one embodiment of this application;
[0024] Figure 2 This is a schematic diagram of the structure of a lightning protection filter circuit provided in another embodiment of this application;
[0025] Figure 3 A schematic diagram of the structure of a lightning protection filter circuit provided in another embodiment of this application;
[0026] Figure 4 A schematic diagram of the structure of a lightning protection filter circuit provided in another embodiment of this application;
[0027] Figure 5 This is a schematic diagram of the framework structure of a lightning protection filtering system provided in an embodiment of this application.
[0028] Specific element symbol explanations: 100 - First power line, 200 - Second power line, 300 - Third power line, 400 - Surge protection device, 500 - Status detection sensor, 600 - Signal processing terminal, 700 - Cloud platform, 800 - Human-machine interface, L1 - First inductor, L2 - Second inductor, L3 - Third inductor, SPD1 - First surge protection device, SPD2 - Second surge protection device, SPD3 - Third surge protection device, SPD4 - Fourth surge protection device, IN1 - First input terminal, IN2 - Second input terminal, IN3 - Third input terminal, IN4 - Fourth input terminal, IN5 - Fifth input terminal, IN6 - Sixth input terminal. Detailed Implementation
[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0030] It should be noted that when a component is referred to as being "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0031] It should be understood that the terms "length", "width", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0033] It's important to understand that with the rapid advancement of technology, modern electronic technology has permeated every corner of our lives. From communication and transportation to healthcare and entertainment, electronic devices are ubiquitous, greatly improving the convenience and efficiency of our lives. However, at the same time, these electronic devices also face the threat of a common and highly destructive natural phenomenon—lightning.
[0034] Lightning, as a powerful form of energy release in nature, can generate overvoltages and overcurrents that can cause catastrophic damage to electronic equipment. This damage can not only destroy the equipment itself but also lead to the loss of valuable data and, in some cases, even threaten personal safety. Lightning disasters are listed by the United Nations as one of the ten most serious natural disasters. Every year, lightning poses a serious threat to people's personal safety and property. Due to the widespread propagation of induced lightning, it can easily infiltrate equipment along power lines or ground wires, making electronic equipment particularly vulnerable. Therefore, effectively protecting electronic equipment from lightning strikes has become a crucial issue. Thus, lightning protection technology, a technical means designed to protect electronic equipment from lightning strikes, is especially critical.
[0035] Current surge protection circuits employ various surge protection devices, such as SPDs (Surge Protective Devices). These devices effectively absorb overvoltages and overcurrents generated by lightning in most cases, protecting the safe operation of electronic equipment. However, in practical applications, the effectiveness of these devices is not always satisfactory. One major problem is the inherent delay in the activation response time of SPDs and similar devices. This means that in the initial stages of a lightning strike, although the lightning has already begun to threaten electronic equipment, the SPDs may not have activated in time and cannot provide effective protection. This delay may only be a few microseconds or milliseconds, but under the high energy of a lightning strike, this brief delay is sufficient to cause serious damage to electronic equipment. Furthermore, the protective effect of SPDs and similar devices is also affected when the lightning frequency is high. This is because after absorbing lightning energy, surge protection devices need time to recover their protective capabilities. If the lightning frequency is too high, the devices may not have enough time to fully recover, thus failing to provide effective protection against subsequent lightning strikes.
[0036] Therefore, this application improves the relevant lightning protection filter circuit and electronic equipment based on this.
[0037] Please see Figure 1 , Figure 1 A schematic diagram of the lightning protection filter circuit provided in this embodiment is shown. The lightning protection filter circuit of this embodiment includes a first power line 100, a second power line 200, and at least one lightning protection device 400; a first inductor L1 is provided on the first power line 100; the at least one lightning protection device 400 includes a first lightning protection device SPD1, one end of the first lightning protection device SPD1 is connected to the first power line 100, and the other end is connected to the second power line 200; the first power line 100 has a first input terminal IN1 for lightning signal input, and one end of the first lightning protection device SPD1 is connected between the first input terminal IN1 and the first inductor L1.
[0038] It should be explained that the first power line 100 and the second power line can be a live wire, a neutral wire, and a ground wire. The surge protector 400 can be an SPD surge protector 400. The first surge protector SPD1 can promptly divert a lightning signal to the ground wire or other safe area when the lightning signal attempts to enter the circuit through the first power line 100, thereby preventing the lightning signal from damaging other parts of the circuit.
[0039] Understandably, the first inductor L1 serves to impede the passage of high-frequency signals, including high-frequency interference signals generated by lightning. When a lightning signal enters the first power line 100 through the first input terminal IN1, the first inductor L1 acts as a barrier, thereby reducing the impact of the lightning signal on the circuit. Specifically, the characteristic of an inductor is to impede the passage of AC signals. The formula for calculating inductive reactance is: X = 2 * π * F * L (π is pi, F is the frequency, and L is the inductance). For 50Hz AC mains power, the inductive reactance is a few milliohms to tens of milliohms, which is almost negligible; for lightning, the frequency is generally above kHz, and the inductive reactance is much greater than that of AC mains power, thus effectively impeding the passage of lightning.
[0040] In current surge protection filter circuits, the surge protection device 400 has a certain start-up time, resulting in poor surge protection performance during this time. However, the first surge protection device SPD1 of this application can discharge current and clamp the voltage within the protection voltage range; and when a lightning signal enters from the first input terminal IN1 before the first surge protection device SPD1 has started, the first inductor L1 can generate a directional electromotive force and impede current flow, thus playing a certain surge protection role during the start-up time of the first surge protection device SPD1, thereby improving the surge protection effect of the surge protection filter circuit.
[0041] Please refer to the embodiments described in this application. Figure 2 , Figure 2 A schematic diagram of the lightning protection filter circuit provided in this embodiment is shown. A second inductor L2 is provided on the second power line 200 of this embodiment. The second power line 200 has a second input terminal IN2 for lightning signal input. One end of the first surge protector is connected between the second input terminal IN2 and the second inductor L2.
[0042] Understandably, when a lightning signal enters the circuit from the second input terminal IN2, the second inductor L2 will impede the passage of the high-frequency lightning signal due to the startup time of the first surge protector SPD1, thereby reducing the impact of the lightning signal on subsequent parts of the circuit. After the first surge protector SPD1 starts up, it can quickly respond and absorb the overvoltage and overcurrent in the lightning signal, diverting them to the ground wire or other safe areas, thus preventing the lightning signal from damaging other parts of the circuit.
[0043] Furthermore, the first surge protector SPD1 is connected to both the first power line 100 and the second power line 200, allowing it to provide surge protection on both power lines simultaneously. Regardless of whether a lightning signal enters the circuit from the first input terminal IN1 or the second input terminal IN2, the first surge protector SPD1 can effectively suppress and absorb it.
[0044] In some embodiments of this application, please refer to Figure 3 , Figure 3 A schematic diagram of the lightning protection filter circuit provided in this embodiment is shown. The first power line 100 in this embodiment also has a third input terminal IN3 for lightning signal input, and a first inductor L1 is disposed between the first input terminal IN1 and the third input terminal IN3; at least one lightning protection device 400 also includes a second lightning protection device SPD2, one end of the second lightning protection device SPD2 is connected between the third input terminal IN3 and the first inductor L1, and the other end is connected to the second power line 200.
[0045] Understandably, when a lightning signal enters the first power line 100 via the third input terminal IN3, the first inductor L1 can impede the passage of the high-frequency lightning signal during the startup process of the second surge protector SPD2, thanks to its inductive characteristics. After the second surge protector SPD2 has started up, it can quickly respond to and absorb the overvoltage and overcurrent in the lightning signal, directing them to ground or other safe areas, thereby preventing the lightning signal from damaging other parts of the circuit.
[0046] Please refer to the embodiments described in this application. Figure 3 In this embodiment, the second power line 200 also has a fourth input terminal IN4 for lightning signal input, the second inductor L2 is disposed between the second input terminal IN2 and the fourth input terminal IN4, and the other end of the second surge protection device SPD2 is connected between the fourth input terminal IN4 and the second inductor L2.
[0047] Understandably, the lightning signal enters the second power line 200 along the fourth input terminal IN4. During the startup process of the second surge protector SPD2, the second inductor L2 can impede the passage of the high-frequency lightning signal through its inductive characteristics. After the second surge protector SPD2 has started up, it can quickly respond to and absorb the overvoltage and overcurrent in the lightning signal, diverting them to the ground wire or other safe areas, thereby preventing the lightning signal from damaging other parts of the circuit.
[0048] In some embodiments of this application, please refer to Figure 4 , Figure 4 A schematic diagram of the lightning protection filter circuit provided in this embodiment is shown. The lightning protection filter circuit in this embodiment also includes a third power line 300, and at least one lightning protection device 400 includes a third lightning protection device SPD3. One end of the third lightning protection device SPD3 is connected to the lightning protection grounding point of the second power line 200 along with the first lightning protection device SPD1, and the other end of the third lightning protection device SPD3 is connected to the third power line 300.
[0049] It is understood that the first power line 100 is the live wire, the second power line 200 is the ground wire, and the third power line 300 is the neutral wire. When the lightning signal is a common-mode signal, that is, when the lightning signal enters along the first power line 100 and / or the third power line 300, the first surge protector SPD1 and / or the third surge protector SPD3 can play a surge protection role, either separately or simultaneously.
[0050] Please refer to the embodiments described in this application. Figure 4 In this embodiment, a third inductor L3 is provided on the third power line 300. The third power line 300 has a fifth input terminal IN5 for lightning signal input. The other end of the third surge protection device SPD3 is connected between the fifth input terminal IN5 and the third inductor L3.
[0051] It is understandable that the third inductor L3 can block high-frequency lightning signals from passing through through its inductance characteristics when the third surge protection device SPD3 is in the startup process, thereby improving the surge protection effect on the lightning signal input to the third input terminal IN3.
[0052] Please refer to the embodiments described in this application. Figure 4 In this embodiment, the third power line 300 also has a sixth input terminal IN6 for lightning signal input, and the third inductor L3 is disposed between the fifth input terminal IN5 and the sixth input terminal IN6; at least one lightning protection device 400 also includes a fourth lightning protection device SPD4, one end of the fourth lightning protection device SPD4 is connected to the lightning protection grounding point, and the other end is connected between the third inductor L3 and the sixth input terminal IN6.
[0053] Understandably, the fourth surge protector SPD4 is directly connected to the surge protection grounding point, and the second inductor L2 can prevent surges from entering the equipment from the ground wire.
[0054] Please refer to the embodiments described in this application. Figure 4 In this embodiment, the other end of the second surge protection device SPD2 is connected to the surge protection grounding point. It can be understood that the second surge protection device SPD2 is directly connected to the surge protection grounding point, and the second inductor L2 can prevent surges from entering the equipment from the ground wire.
[0055] In some embodiments of this application, the lightning protection filter circuit of this embodiment further includes a status detection sensor 500, which is used to detect the working status of at least one lightning protection device 400.
[0056] In some embodiments of this application, the status detection sensor 500 includes at least one of a temperature sensor, a remote signaling monitoring sensor, and a leakage current monitoring sensor. It should be explained that the temperature sensor can detect the surface temperature of the surge protection device 400. If the temperature is significantly higher than a preset temperature, the surge protection device 400 needs to be replaced to ensure the surge protection effect of the circuit. The remote signaling monitoring sensor can obtain the operating status information of the surge protection device 400 through remote signal transmission. When a remote signaling abnormality is detected, the surge protection device 400 needs to be replaced promptly. The leakage current monitoring sensor is typically at the microampere level. When the detected leakage current rises to the milliampere level, the surge protection device 400 has aged and needs to be replaced.
[0057] Furthermore, to better implement the lightning protection filter circuit in any of the above embodiments, please refer to [reference needed] based on the above lightning protection filter circuit. Figure 5 , Figure 5 A schematic diagram of the framework structure of the lightning protection filtering system provided in this embodiment is shown. This application also provides a lightning protection filtering system, including the aforementioned lightning protection filtering circuit and a signal processing terminal 600. The lightning protection filtering circuit includes a status detection sensor 500 for monitoring the status of at least one lightning protection device 400. The signal processing terminal 600 is used to acquire monitoring data from the status detection sensor 500 and output a processed signal based on the monitoring data. The processed signal is used to characterize the operating status of at least one lightning protection device 400.
[0058] In some embodiments, the signal processing terminal 600 is an MCU module. The signal processing terminal 600 is also connected to a human-machine interface 800 and a cloud platform 700. The monitored data is uploaded to the cloud platform 700 or the monitoring center via wired or wireless means, and users can clearly see the status of these surge protectors on their computers.
[0059] In some embodiments, the signal processing terminal 600 can also collect the ambient temperature of the environment where the lightning protection filter circuit is located. When the lightning protection device 400 is in normal use, the surface temperature will not be higher than a certain value T0 of the ambient temperature. When the surface temperature of the lightning protection device 400 is detected to be much higher than T0, the lightning protection device 400 is damaged and needs to be replaced.
[0060] Furthermore, in order to better implement the lightning protection filter circuit in any of the above embodiments, based on the above lightning protection filter circuit, this application also provides an electronic device, including a circuit board, on which the above lightning protection filter circuit is integrated.
[0061] In some embodiments, electronic devices with lightning protection filtering circuits can be used in places where lightning protectors need to be installed, such as communication base stations, computer rooms, railways, ports, gas stations, and equipment.
[0062] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0063] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.
[0064] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.
[0065] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the utility model, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.
[0066] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A lightning protection filter circuit, characterized by, The application relates to a lightning protection filter circuit. The first power line is provided with a first inductor; The second power line is provided with a second inductor; The lightning protection filter circuit further comprises a third power line, and the at least one lightning protection device further comprises a third lightning protection device, one end of the third lightning protection device is connected to the first lightning protection device at a lightning protection grounding point of the second power line, and the other end of the third lightning protection device is connected to the third power line; The first power line is a fire line, the second power line is a ground line, and the third power line is a zero line; when a lightning signal is a common-mode signal invasion, the lightning signal invades along the first power line and / or the third power line, and the first lightning protection device and / or the third lightning protection device respectively or simultaneously plays a lightning protection role; The third power line is provided with a third inductor, the third power line is provided with a fifth input end for inputting a lightning signal, and the other end of the third lightning protection device is connected between the fifth input end and the third inductor; The third power line is further provided with a sixth input end for inputting a lightning signal, the third inductor is arranged between the fifth input end and the sixth input end, the at least one lightning protection device further comprises a fourth lightning protection device, one end of the fourth lightning protection device is connected to the lightning protection grounding point, and the other end of the fourth lightning protection device is connected between the third inductor and the sixth input end; The lightning protection filter circuit further comprises a state detection sensor, and the state detection sensor is used for detecting the working state of the at least one lightning protection device; The first power line is further provided with a third input end for inputting a lightning signal, the first inductor is arranged between the first input end and the third input end, the at least one lightning protection device further comprises a second lightning protection device, one end of the second lightning protection device is connected between the third input end and the first inductor, and the other end of the second lightning protection device is connected to the second power line. The second power line is further provided with a fourth input end for inputting a lightning signal, the second inductor is arranged between the second input end and the fourth input end, and the other end of the second lightning protection device is connected between the fourth input end and the second inductor. The other end of the second lightning protection device is connected to the lightning protection grounding point. The state detection sensor comprises at least one of a temperature sensor, a remote monitoring sensor and a leakage current monitoring sensor.
2. The lightning protection filter circuit of claim 1, wherein, 3. The lightning protection filter circuit of claim 1, wherein, 4. The lightning protection filter circuit of claim 1, wherein, 5. A lightning protection filter system, characterized by, The lightning protection filter circuit and the signal processing terminal, the lightning protection filter circuit comprises a state detection sensor for monitoring at least one lightning protection device, the signal processing terminal is used for acquiring monitoring data of the state detection sensor and outputting a processing signal according to the monitoring data, and the processing signal is used for representing a working state of at least one lightning protection device. The signal processing terminal can also collect the ambient temperature of the environment where the lightning protection filter circuit is located. When the lightning protection device is normally used, the surface temperature will not be higher than a certain value T0 of the ambient temperature. When it is monitored that the surface temperature of the lightning protection device is much higher than T0, the lightning protection device has been damaged and needs to be replaced.
6. An electronic device, comprising: The circuit board is integrated with the lightning protection filter circuit according to any one of claims 1 to 4.