Airborne gigabit network lightning protection filter circuit and lightning protection filter assembly
By connecting a high-voltage DC blocking capacitor, an ESD device, and a common-mode inductor in series in the airborne gigabit network signal line, the problem of signal distortion is solved, achieving efficient lightning isolation and signal transmission, and providing strong lightning protection capabilities.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA AVIATION OPTICAL ELECTRICAL TECH CO LTD
- Filing Date
- 2025-03-24
- Publication Date
- 2026-05-01
AI Technical Summary
In the existing technology, the lightning protection filtering circuit for airborne gigabit network signals uses TVS devices and filter capacitors, which leads to signal distortion and affects the signal transmission quality.
A combination of high-voltage DC blocking capacitors, ESD devices, and common-mode inductors is used, connected in series on the differential signal line. The high-voltage DC blocking capacitors are used for lightning isolation, the ESD devices are used to discharge residual energy, and the common-mode inductors are used for filtering.
It achieves effective lightning isolation and high-quality signal transmission, avoids signal distortion, and has a lightning protection level of 1600V.
Smart Images
Figure CN224191638U_ABST
Abstract
Description
Technical Field
[0008] , , ,
[0009]
[0001] The utility model belongs to the technical field of lightning protection, and more particularly to an onboard gigabit Ethernet lightning protection filtering circuit and a lightning protection filtering component. Background Art
[0002] In the gigabit Ethernet circuit supporting the onboard control system, it is usually necessary to design a lightning protection filtering circuit. In the conventional lightning protection filtering circuit design, TVS devices are usually used as lightning protection devices, and capacitors are used as filtering elements. However, due to the high signal rate of the gigabit Ethernet, the parasitic capacitance in the TVS device and the filtering capacitance distort the gigabit Ethernet signal, making the signal transmission abnormal. Summary of the Utility Model
[0003] To solve the above technical problems, the utility model provides an onboard gigabit Ethernet lightning protection filtering circuit and a lightning protection filtering component.
[0004] An onboard gigabit Ethernet lightning protection filtering circuit according to the utility model includes differential signal lines, and the differential signal lines are sequentially connected with a high-voltage DC-blocking capacitor, an ESD device, and a common-mode inductor in the signal transmission direction. Among them, the high-voltage DC-blocking capacitor is connected in series to the signal line in the differential signal lines, one end of the ESD device is connected to the signal line in the differential signal lines, and the other end is grounded, and the common-mode inductor is connected in series between the differential signal lines.
[0005] Further, the capacitance value of the high-voltage DC-blocking capacitor is 470 pF - 1000 pF.
[0006] An onboard gigabit Ethernet lightning protection filtering component includes an input connector and an output connector connected by differential signal lines. The differential signal lines are sequentially connected with a high-voltage DC-blocking capacitor, an ESD device, and a common-mode inductor in the signal transmission direction. Among them, the high-voltage DC-blocking capacitor is connected in series to the signal line in the differential signal lines, one end of the ESD device is connected to the signal line in the differential signal lines, and the other end is grounded, and the common-mode inductor is connected in series between the differential signal lines; the housing of the input connector is grounded.
[0007] Further, the input connector and the output connector are connected by a rigid-flexible printed circuit board, and the differential signal lines, the high-voltage DC-blocking capacitor, the ESD device, and the common-mode inductor are arranged on the rigid-flexible printed circuit board.
[0008] Further, the rigid-flexible printed circuit board includes a rigid board and a flexible board. The input connector, the differential signal lines, the high-voltage DC-blocking capacitor, the ESD device, and the common-mode inductor are arranged on the rigid board, and one end of the flexible board is connected to the rigid board and the other end is connected to the output connector.
[0009] Furthermore, the input connector and rigid plate are fixed on the support grounding frame, and the housing of the input connector is in contact with the support grounding frame.
[0010] Furthermore, the grounding support frame includes a mounting plate and a support column mounted on the mounting plate. The grounding support frame has threaded through holes penetrating the mounting plate and the support column. An input connector is mounted on the mounting plate, and a rigid plate is mounted on the support column. Fasteners are inserted through the holes on the input connector housing and the holes on the rigid plate, and the fasteners are screwed into the threaded through holes.
[0011] Furthermore, the mounting plate is provided with insertion holes for inserting input connectors.
[0012] Compared with the prior art, the advantages of this utility model are:
[0013] 1. This utility model utilizes the principle of high-pass filtering to connect a high-voltage DC blocking capacitor in series in the signal line to achieve the transmission of gigabit network high-speed signals. At the same time, it attenuates and suppresses lightning, releasing most of the lightning voltage across the two ends of the high-voltage DC blocking capacitor, thus preventing lightning from being transmitted to the back end of the signal line.
[0014] 2. This utility model uses a series common-mode inductor in the differential signal line to filter the signal, filter out high-frequency interference, and avoid the situation where the use of high-voltage DC blocking capacitors for filtering affects the signal transmission quality.
[0015] 3. The circuit of this utility model uses an ESD device to discharge residual lightning energy, avoiding the large parasitic capacitance of conventional TVS devices that affects signal transmission quality.
[0016] 4. This utility model has strong lightning protection capability, with a maximum voltage of 1600V (B4 lightning protection level).
[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0018] Figure 1 This is a circuit diagram of an embodiment of an airborne gigabit network lightning protection filter circuit according to the present invention;
[0019] Figure 2 This is a front view of an embodiment of an airborne gigabit network lightning protection filter component according to the present invention;
[0020] Figure 3 for Figure 2 Side view;
[0021] Figure 4 for Figure 3 A three-dimensional schematic diagram of the grounding support frame;
[0022] Figure 5 for Figure 4 A three-dimensional schematic diagram of the grounding support frame from another perspective.
[0023] Figure label:
[0024] 1-Input connector,
[0025] 2-Output connector,
[0026] 3-Rigid-flex printed circuit board,
[0027] 301 - High-voltage DC blocking capacitor
[0028] 302-ESD device,
[0029] 303-Common Mode Inductor
[0030] 304 rigid sheet,
[0031] 305-Flexible Board
[0032] 4-Support grounding frame,
[0033] 401-Mounting Plate
[0034] 402 - Support Column
[0035] 403 - Insertion Hole
[0036] 404 - Threaded through hole. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0040] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0041] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0042] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 application based on the specific circumstances.
[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0044] The following detailed description, in conjunction with embodiments, further illustrates the features and performance of an airborne gigabit network lightning protection filter circuit and lightning protection filter component suitable for this application.
[0045] This utility model provides an embodiment of an airborne gigabit network lightning protection filter circuit, such as... Figure 1 As shown. The circuit includes several pairs of signal lines. In this embodiment, the circuit includes a pair of signal lines, namely a signal line from the signal input terminal ETH_DA_P to the signal output terminal ETH_DA_OUT_P and a signal line from the signal input terminal ETH_DA_N to the signal output terminal ETH_DA_OUT_N. The two signal lines are used to transmit differential signals and form differential signal lines.
[0046] The differential signal line is sequentially configured with a high-voltage DC blocking capacitor 301, an ESD device (an electronic component for electrostatic discharge protection) 302, and a common-mode inductor 303 in the signal transmission direction. Specifically, a high-voltage DC blocking capacitor 301 is first connected in series on the signal line. The capacitance of the high-voltage DC blocking capacitor 301 is 470pF-1000pF. This high-voltage DC blocking capacitor 301 can transmit gigabit network signals normally and can block most of the lightning energy, making the circuit open or in a high-impedance state during lightning strikes, preventing the lightning from propagating further. Then, the high-voltage DC blocking capacitor 301... Following line 01 is an ESD device 302. One end of ESD device 302 is connected to the signal line, and the other end is grounded. ESD device 302 has very small parasitic capacitance, resulting in virtually no attenuation for gigabit networks. It also discharges lightning energy that leaks through the high-voltage DC blocking capacitor 301, ensuring that the lightning voltage in the line does not exceed the load capacity of the downstream components. Finally, a common-mode inductor 303 is connected in series between the differential signal lines. The common-mode inductor 303 provides no attenuation to the differential signal, ensuring normal transmission of gigabit network signals, and simultaneously filtering and suppressing high-frequency common-mode interference in gigabit network signals. This circuit achieves lightning protection and filtering functions for gigabit networks.
[0047] Conventional surge protection and filtering circuits typically use TVS (Transient Voltage Suppressor) devices as surge protectors and capacitors as filter elements. However, due to the high signal speed of gigabit networks, the parasitic capacitance of the TVS devices and the filter capacitors distort the gigabit network signal, causing abnormal signal transmission. To achieve surge protection and filtering, a series high-voltage DC blocking capacitor 301 (high-pass filter) is used to isolate lightning, and an ESD device 302 is used to discharge the residual energy after isolation. A common-mode inductor 303 is connected in series in the differential signal lines at the downstream end to achieve gigabit network filtering.
[0048] This utility model provides an embodiment of an airborne gigabit network lightning protection filter component, such as... Figures 2 to 5As shown, the component includes an input connector 1, an output connector 2, a rigid-flex printed circuit board 3, and a grounding support 4, which is grounded. The input connector 1 and the rigid-flex printed circuit board 3 are fixed to both ends of the grounding support 4 using fasteners. This achieves both fixed installation of the rigid-flex printed circuit board 3 and, through contact between the input connector 1 and the grounding support 4, forms a discharge path for the lightning protection filter circuit.
[0049] The rigid-flex printed circuit board 3 includes a rigid plate 304 and a flexible plate 305. The rigid plate 304 is mounted on the support grounding frame 4 by fasteners. In this embodiment, two support grounding frames 4 are provided on the rigid plate 304, and an input connector 1 is provided at the other end of each of the two support grounding frames 4. In other embodiments, a corresponding number of support grounding frames 4 and input connectors 1 can be provided as needed.
[0050] One end of the flexible board 305 is connected to the rigid board 304, and the other end is connected to the output connector 2. The input connector 1 and the output connector 2 achieve signal transmission through the rigid-flex printed circuit board 3.
[0051] A high-voltage DC blocking capacitor 301, an ESD device 302, and a common-mode inductor 303 are disposed on the rigid-flex printed circuit board 3. The high-voltage DC blocking capacitor 301, ESD device 302, and common-mode inductor 303 are connected to the corresponding differential signal lines on the rigid-flex printed circuit board 3. The connection method of the high-voltage DC blocking capacitor 301, ESD device 302, and common-mode inductor 303 to the differential signal lines is the same as the connection method in an embodiment of an airborne gigabit network surge protection filter circuit, and will not be described again here. The input connector 1 serves as the signal input terminal to input the signal. The input signal is processed sequentially by the high-voltage DC blocking capacitor 301, ESD device 302, and common-mode inductor 303 on the corresponding signal lines, and then output as the signal output terminal via the output connector 2.
[0052] In this embodiment, the high-voltage DC blocking capacitor 301, ESD device 302, and common-mode inductor 303 are all mounted on the rigid plate 304. Each input connector 1 is provided with a corresponding number of differential signal lines and high-voltage DC blocking capacitors 301, ESD devices 302, and common-mode inductors 303 on the differential signal lines according to the number of signals it transmits. Specifically, on a differential signal line, every two high-voltage DC blocking capacitors 301 and two ESD devices 302 correspond to one common-mode inductor 303.
[0053] The gigabit network signal enters through the input connector 1 (signal input terminal), passes through the rigid-flex printed circuit board 3, and then exits through the output connector 2 (signal output terminal), thus achieving complete signal transmission. While the rigid-flex printed circuit board 3 enables gigabit network signal transmission, it also utilizes the high-voltage DC blocking capacitor 301, ESD device 302, and common-mode inductor 303 on the board to discharge lightning and filter and suppress high-frequency interference.
[0054] The grounding support frame 4 is made of titanium alloy, which is lightweight, high-strength, and corrosion-resistant. The grounding support frame 4 includes a mounting plate 401 and support columns 402. The support columns 402 are vertically arranged on one surface of the mounting plate 401. In this embodiment, a support column 402 is arranged at each of the four corners of the mounting plate 401.
[0055] Mounting plate 401 has insertion holes 403 for inserting input connector 1. The four corners of the grounding support frame 4 have threaded through holes 404, which penetrate the mounting plate 401 and the corresponding support post 402. After inserting the input connector 1 into the insertion hole 403, screws or other fasteners (e.g., bolts, studs) are passed through holes in the housing of the input connector 1 and screwed into the threaded through holes 404 to fix the input connector 1 to the grounding support frame 4. The tail of the input connector 1 passes through the insertion hole 403 and is connected to the rigid-flex printed circuit board 3 via cables or other connecting components.
[0056] The end face of the support column 402 is fitted onto the rigid plate 304. Screws or other fasteners are passed through the holes in the rigid plate 304 and screwed into the threaded through holes 404 to fix the rigid plate 304 onto the support grounding frame 4.
[0057] One end of the grounding support frame 4 is fixed to the rigid-flexible printed circuit board 3, and the other end is fixed to the input connector 1. The housing of the input connector 1 contacts the grounding support frame 4 to achieve structural support and fixation. At the same time, the grounding support frame 4 is also a discharge path for lightning.
[0058] In another embodiment of the airborne gigabit network lightning protection filter component of this utility model, based on the above embodiment of the airborne gigabit network lightning protection filter component, the rigid-flex printed circuit board 3 can be replaced with other differential signal lines that can connect the input connector 1 and the output connector 2, such as cables with differential signal lines in them; at the same time, the housing of the input connector 1 is grounded, replacing the grounding support frame 4, as a lightning discharge path.
[0059] This invention enables lightning protection and filtering functions for gigabit networks in airborne control systems. Its features are summarized as follows:
[0060] 1. This utility model utilizes the principle of high-pass filtering to connect a high-voltage DC blocking capacitor 301 in series in the signal line to achieve the transmission of gigabit network high-speed signals. At the same time, it attenuates and suppresses lightning, releasing most of the lightning voltage across the two ends of the high-voltage DC blocking capacitor 301, thus preventing lightning from being transmitted to the back end of the signal line.
[0061] 2. This utility model uses a series common-mode inductor 303 in the differential signal line to filter the signal, filter out high-frequency interference, and avoid the situation where the use of high-voltage DC blocking capacitor 301 for filtering affects the signal transmission quality.
[0062] 3. The circuit of this utility model uses an ESD device 302 to discharge residual lightning energy, avoiding the large parasitic capacitance of conventional TVS devices that affects signal transmission quality.
[0063] 4. This utility model has strong lightning protection capability, with a maximum voltage of 1600V (B4 lightning protection level).
[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An airborne gigabit network surge protection filter circuit, comprising differential signal lines, characterized in that: The differential signal line is connected in sequence in the signal transmission direction to a high-voltage DC blocking capacitor (301), an ESD device (302), and a common-mode inductor (303). The high-voltage DC blocking capacitor (301) is connected in series on the signal line of the differential signal line. One end of the ESD device (302) is connected to the signal line of the differential signal line and the other end is grounded. A common-mode inductor (303) is connected in series between the differential signal lines.
2. The airborne gigabit network lightning protection filter circuit according to claim 1, characterized in that: The capacitance of the high-voltage DC blocking capacitor (301) is 470pF-1000pF.
3. An airborne gigabit network surge protection filter assembly, comprising an input connector (1) and an output connector (2) connected via differential signal lines, characterized in that: The differential signal lines are connected in sequence in the signal transmission direction to a high-voltage DC blocking capacitor (301), an ESD device (302), and a common-mode inductor (303). The high-voltage DC blocking capacitor (301) is connected in series on the signal line of the differential signal lines. One end of the ESD device (302) is connected to the signal line of the differential signal lines and the other end is grounded. A common-mode inductor (303) is connected in series between the differential signal lines. The housing of the input connector (1) is grounded.
4. The airborne gigabit network lightning protection filter assembly according to claim 3, characterized in that: The input connector (1) and the output connector (2) are connected by a rigid-flex printed circuit board (3). Differential signal lines, high voltage DC blocking capacitors (301), ESD devices (302), and common mode inductors (303) are disposed on the rigid-flex printed circuit board (3).
5. The airborne gigabit network lightning protection filter assembly according to claim 4, characterized in that: The rigid-flex printed circuit board (3) includes a rigid board (304) and a flexible board (305). The input connector (1), differential signal line, high voltage DC blocking capacitor (301), ESD device (302), and common mode inductor (303) are disposed on the rigid board (304). One end of the flexible board (305) is connected to the rigid board (304), and the other end is connected to the output connector (2).
6. The airborne gigabit network lightning protection filter assembly according to claim 5, characterized in that: The input connector (1) and the rigid plate (304) are fixed on the support grounding frame (4), and the housing of the input connector (1) is in contact with the support grounding frame (4).
7. The lightning protection filter assembly for an onboard gigabit network of claim 6, wherein: The grounding support frame (4) includes a mounting plate (401) and a support column (402) set on the mounting plate (401). The grounding support frame (4) is provided with a threaded through hole (404) that passes through the mounting plate (401) and the support column (402). An input connector (1) is set on the mounting plate (401), and a rigid plate (304) is set on the support column (402). Fasteners are inserted through the holes on the housing of the input connector (1) and the holes on the rigid plate (304), and the fasteners are screwed into the threaded through hole (404).
8. The airborne gigabit network lightning protection filter assembly according to claim 7, characterized in that: The mounting plate (401) is provided with insertion holes (403) for inserting the input connector (1).