Lightning protection filter assembly for multi-signal on-board controller

Abstract

The application relates to a lightning protection filter assembly of a multi-signal airborne controller, a filter circuit board, a compartment shell and a compartment partition, the filter circuit board is provided with a first connector, a second connector and a filter protection circuit, the first connector and the second connector are arranged on the two sides of the filter circuit board, the compartment shell comprises a bottom plate and a side plate, the filter circuit board is arranged on the bottom plate, the side plate is arranged around the bottom plate, a vertical plane where the side plate is located is perpendicular to a horizontal plane where the bottom plate is located, an input hole is formed in the bottom plate, the input hole is aligned with the first connector, a compartment partition is arranged on one side of the side plate close to the filter circuit board, a horizontal plane where the compartment partition is located is perpendicular to a horizontal plane where the side plate is located, an output hole is formed in the compartment partition, the output hole is aligned with the second connector. The application has the effect of solving the high-frequency interference coupling problem existing in the filter to a certain extent.

Description

Technical Field

[0001] This application relates to the field of filters, and more particularly to a lightning protection filter component for a multi-signal airborne controller. Background Technology

[0002] In recent years, filters, as mobile carriers of electronic equipment, have been widely used in electronic systems in aviation, aerospace, ships, and on the ground. However, due to the high requirements of electronic equipment for communication and control signals, and its poor tolerance to transient overvoltages and overcurrents, and its susceptibility to malfunction or permanent damage after being subjected to lightning strikes, lightning protection for electronic equipment is one of the necessary measures to ensure the safe and reliable operation of electronic equipment.

[0003] In a filter, the input terminal is the input signal, which is the unfiltered signal, and the output terminal is the output signal, which is the filtered signal. The interference amplitude of the unfiltered signal is stronger than that of the filtered signal. In related technologies, due to differences in the placement of filtering components, the interleaved inductors can cause high-frequency coupling problems before and after filtering. Furthermore, traditional signal filter structures do not take special measures to avoid high-frequency coupling problems before and after filtering, resulting in the overall filtering effect not reaching the optimal state.

[0004] In summary, the inventors believe that existing filtering components cannot effectively solve the high-frequency interference coupling problem in filters. Summary of the Invention

[0005] To address the high-frequency interference coupling problem in filters to some extent, this application provides a lightning protection filter component for a multi-signal airborne controller.

[0006] The lightning protection and filtering component for a multi-signal airborne controller provided in this application adopts the following technical solution:

[0007] A lightning protection filtering assembly for a multi-signal airborne controller includes a filter circuit board, a compartment housing, and a compartment partition. The filter circuit board is provided with a first connector, a second connector, and a filtering protection circuit. The first connector and the second connector are located on opposite sides of the filter circuit board. The compartment housing includes a bottom plate and side plates. The filter circuit board is located on the bottom plate, and the side plates are located around the bottom plate. The vertical plane of the side plates is perpendicular to the horizontal plane of the bottom plate. An input hole is provided on the bottom plate, which is aligned with the first connector. The compartment partition is located on the side plate near the filter circuit board. The horizontal plane of the compartment partition is perpendicular to the horizontal plane of the side plates. An output hole is provided on the compartment partition, which is aligned with the second connector.

[0008] By adopting the above technical solution, the filter circuit board can filter the input signal. The first and second connectors on the filter circuit board can limit the positions of the input and output signals on the filter circuit board. The filter circuit board is positioned between the compartment housing and the compartment partition, which can prevent interference from other circuits to the filter circuit board to a certain extent. At the same time, the input hole on the compartment housing and the output hole on the compartment partition can separate the input signal and the output signal, thereby avoiding high-frequency interference coupling between the input signal and the output signal to a certain extent.

[0009] Optionally, a filter magnetic ring is also included, which includes a first magnetic ring coil and a second magnetic ring coil, and the first magnetic ring coil and the second magnetic ring coil are sleeved on the filter circuit board.

[0010] By adopting the above technical solution, the first magnetic ring coil and the second magnetic ring coil are set on the filter circuit board to act as common mode inductors, which can reduce costs to a certain extent compared with the use of single mode inductors.

[0011] Optionally, the first magnetic ring coil and the second magnetic ring coil are in the shape of a racetrack.

[0012] By adopting the above technical solution, the first magnetic ring coil and the second magnetic ring coil are set as racetrack-shaped structures, so the diameter of the internal wires is less affected, which determines that a larger current signal can be carried inside by a multi-core thicker cable.

[0013] Optionally, a magnetic ring fixing clip is also included, which is disposed on the magnetic ring coil and is used to fix the filter circuit board with the magnetic ring coil sleeved on it on the base plate.

[0014] Optionally, it also includes an input connector, a front panel housing, an adapter circuit board, and an input rectangular PCB connector. The input connector is fixedly mounted on the front panel housing and is used to access external signals. The adapter circuit board is located on the front panel housing near the compartment housing. The input rectangular PCB connector is located on the adapter circuit board near the compartment housing and is aligned with the first connector through the input hole.

[0015] By adopting the above technical solution, the front panel housing can support the connection of the first connector and shield the external interference to the filter protection circuit. The adapter circuit board can convert the signal received by the input connector into the input signal on the filter circuit board. The input rectangular PCB connector can transmit the signal converted by the adapter circuit board to the filter circuit board.

[0016] Optionally, the device also includes an output rectangular PCB connector, a lightning protection circuit board, a backplate housing, and an output connector. The lightning protection circuit board is disposed on the side of the compartment partition away from the compartment housing. The lightning protection circuit board is used to reduce damage to the equipment from lightning strikes to a certain extent. The output rectangular PCB connector is disposed on the side of the lightning protection circuit board near the compartment partition. The output rectangular PCB connector is aligned with the second connector through the output hole. The backplate housing is disposed on the side of the compartment housing away from the bottom plate. The lightning protection circuit board is disposed between the compartment housing and the lightning protection circuit board. The output connector is disposed on the backplate housing away from the lightning protection circuit board. The output connector is used to transmit signals.

[0017] By adopting the above technical solution, the output rectangular PCB connector can transmit the output signal filtered by the filter circuit board to the lightning protection circuit board. The backplate housing can support the output connector and shield the filter protection circuit from external interference.

[0018] Optionally, the first and second magnetic ring coils act as common-mode inductors in the filter protection circuit. The filter protection circuit also includes an input voltage, a switchable gas discharge tube, a resettable fuse, a bidirectional transient suppression diode, a decoupling resistor, and an output voltage. One end of the input voltage is connected to the input terminal of the first magnetic ring coil, and one end of the switchable gas discharge tube is connected to the input voltage, while the other end is grounded. The switchable gas discharge tube contains inert gas to protect the circuit during lightning strikes and other transient events.

[0019] By adopting the above technical solution, the first magnetic ring coil and the second magnetic ring coil are set on the filter circuit board to act as common mode inductors, which can reduce the manufacturing cost to a certain extent compared with the use of single mode inductors.

[0020] Optionally, one end of the resettable fuse is connected to the output terminal of the first magnetic ring coil, and the other end of the resettable fuse is connected to the input terminal of the second magnetic ring coil. The resettable fuse is used to delay and limit current during lightning surges.

[0021] Optionally, one end of the bidirectional transient suppression diode is connected to the output terminal of the self-resetting fuse, and the other end of the bidirectional transient suppression diode is grounded. The bidirectional transient suppression diode is used to protect the filter protection circuit during lightning surges.

[0022] Optionally, one end of the decoupling resistor is connected to the output terminal of the second magnetic ring coil, and the other end of the decoupling resistor is connected to the output voltage. The decoupling resistor is used to adjust the residual voltage at the output voltage output port.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The filter circuit board can filter the input signal. The first and second connectors on the filter circuit board can limit the position of the input and output signals on the filter circuit board. The filter circuit board is located between the compartment housing and the compartment partition, which can prevent interference from other circuits to the filter circuit board to a certain extent. At the same time, the input hole on the compartment housing and the output hole on the compartment partition can separate the input signal and the output signal, thereby avoiding high-frequency interference coupling between the input signal and the output signal to a certain extent.

[0025] 2. The first and second magnetic ring coils are placed on the filter circuit board to act as common-mode inductors, which can reduce manufacturing costs to a certain extent compared to using single-mode inductors. Attached Figure Description

[0026] Figure 1 This is an exploded view of the lightning protection filter component of the multi-signal airborne controller in an embodiment of this application.

[0027] Figure 2 This is an exploded view of the lightning protection filter component of the multi-signal airborne controller in an embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the circuit structure of the filter circuit board of the lightning protection filter component of the multi-signal airborne controller in an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Input connector; 2. Front panel housing; 3. Compartment housing; 31. Base plate; 4. Filter magnetic ring; 41. First magnetic ring coil; 42. Second magnetic ring coil; 5. Filter circuit board; 6. Magnetic ring fixing buckle; 7. Compartment partition; 71. Output hole; 8. Lightning protection circuit board; 9. Back panel housing; 10. Input rectangular PCB connector; 11. Adapter circuit board; 12. Output rectangular PCB connector; 13. Output connector. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a lightning protection and filtering component for a multi-signal airborne controller. (Refer to...) Figure 1-2The lightning protection filter assembly for the multi-signal airborne controller includes an input connector, a front panel housing, a compartment housing, a filter magnetic ring, a filter circuit board, a magnetic ring fixing clip, a compartment partition, a lightning protection circuit board, a back panel housing, an input rectangular PCB connector, an adapter circuit board, an output rectangular PCB connector, and an output connector.

[0032] Reference Figure 1 and Figure 2 The system includes a filter circuit board, a compartment housing, and a compartment partition. The filter circuit board is equipped with a first connector, a second connector, and a filter protection circuit. The first connector and the second connector are located on opposite sides of the filter circuit board. The compartment housing includes a bottom plate and side plates. The filter circuit board is located on the bottom plate, and the side plates are located around the bottom plate. The vertical plane of the side plates is perpendicular to the horizontal plane of the bottom plate. An input hole is provided on the bottom plate, which is aligned with the first connector. The compartment partition is located on the side plate near the filter circuit board. The horizontal plane of the compartment partition is perpendicular to the horizontal plane of the side plate. An output hole is provided on the compartment partition, which is aligned with the second connector.

[0033] In practical operation, the first connector and the second connector on the filter circuit board are located on opposite sides of the plane of the filter circuit board, and the first connector and the second connector are symmetrical about the center of the filter circuit board. The symmetrical arrangement of the first connector and the second connector can define the position of the input signal and the output signal on the filter circuit board. The filter circuit board is located between the compartment housing and the compartment partition, which can prevent interference from other circuits to the filter circuit board to a certain extent. At the same time, the setting of the input hole on the compartment housing and the setting of the output hole on the compartment partition can separate the input signal and the output signal, thereby avoiding high-frequency interference coupling between the input signal and the output signal to a certain extent.

[0034] During operation, the input signal enters the first connector. At this time, the interference of the unfiltered input signal is greater than that of the filtered output signal. If not processed, high-frequency interference coupling will occur between the input signal and the output signal. The input signal is filtered by the filter circuit board to obtain the output signal, which is then sent out through the second connector. This isolates the connection between the input signal and the output signal to a certain extent and can reduce the high-frequency interference coupling problem in the filter to a certain extent.

[0035] It also includes a filter magnetic ring, which includes a first magnetic ring coil and a second magnetic ring coil. The first magnetic ring coil and the second magnetic ring coil are sleeved on the filter circuit board. The first magnetic ring coil and the second magnetic ring coil have a specially designed racetrack-shaped structure.

[0036] In practical operation, the filter magnetic ring is made of nickel-zinc ferrite with a specially formulated high permeability. Its shape is a specially designed racetrack-like structure to facilitate the passage of internal wires. Because the magnetic core is custom-designed, the diameter of the internal wires is less affected, allowing for the transport of larger current signals using multi-core, thicker cables. The external dimensions of the magnetic ring can be manufactured according to the structural requirements of the protection filter.

[0037] The design of using PCB wiring on the filter circuit board instead of a design with a large number of leads has a stronger current carrying capacity in the same wiring space compared with the traditional wire-wound inductor design. It is less likely to cause interference coupling between lines. Moreover, when used for multi-channel filtering, the size of the first magnetic ring coil and the second magnetic ring coil is smaller than that of the traditional inductor. As a result, the product size of the embodiment of this application using PCB wiring design is smaller than that of the design using a large number of leads.

[0038] It also includes a magnetic ring fixing clip, which is set on the magnetic ring coil and is used to fix the filter circuit board with the magnetic ring coil on it to the base plate.

[0039] In the embodiments of this application, the number of magnetic ring fixing clips is the same as the number of filter magnetic rings.

[0040] It also includes an input connector, a front panel housing, an adapter circuit board, an input rectangular PCB connector, an output rectangular PCB connector, a lightning protection circuit board, a back panel housing, and an output connector. The input connector is fixedly mounted on the front panel housing and is used to receive external signals. The adapter circuit board is located on the front panel housing near the compartment housing. The input rectangular PCB connector is located on the adapter circuit board near the compartment housing and is aligned with the first connector through an input hole. The lightning protection circuit board is located on the side of the compartment partition away from the compartment housing and is used to reduce damage to the equipment from lightning strikes to a certain extent. The output rectangular PCB connector is located on the lightning protection circuit board near the compartment partition and is rotated with the second connector through an output hole. The back panel housing is located on the side of the compartment housing away from the front panel housing. The lightning protection circuit board is located between the compartment housing and the lightning protection circuit board. The output connector is located on the back panel housing away from the lightning protection circuit board and is used to transmit signals.

[0041] Reference Figure 3 The filter protection circuit includes an input voltage, a switching gas discharge tube G1, a self-resetting fuse PTC1, a bidirectional transient suppression diode TVS1, a decoupling resistor R1, and an output voltage.

[0042] One end of the input voltage is connected to the input terminal of the first magnetic ring coil. One end of the switch-type gas discharge tube G1 is connected to the input voltage, and the other end is grounded. The switch-type gas discharge tube G1 is filled with inert gas to protect the circuit during lightning and other transient protection events.

[0043] When the input voltage is too high, exceeding the insulation strength of the inert gas inside the switch-type gas discharge tube G1, the gap between the two electrodes inside the switch-type gas discharge tube G1 is broken down by the transient high voltage, causing the switch-type gas discharge tube G1 to change from an insulating state to a conductive state. One end of the switch-type gas discharge tube G1 is grounded, which can transmit the transient high current in the circuit to the ground, thereby protecting the electronic equipment connected in parallel with the switch-type gas discharge tube G1 from damage by transient overvoltage to a certain extent.

[0044] One end of the resettable fuse PTC1 is connected to the output terminal of the first magnetic ring coil, and the other end of the resettable fuse PTC1 is connected to the input terminal of the second magnetic ring coil. The resettable fuse PTC1 is used to delay and limit the current of the filter protection circuit during lightning surge.

[0045] In this embodiment, the resettable fuse PTC1 is a positive temperature coefficient resettable fuse PTC1. When the voltage increases, the current increases, and the heat generated by the current passing through the resettable fuse PTC1 is greater than the heat dissipated, causing the temperature of the resettable fuse PTC1 element to rise sharply. At this stage, even a small increase in temperature will cause a significant increase in resistance, making the resettable fuse PTC1 in a high-resistance state. The increase in resistance restricts the current flow, and the transient current drops sharply in a very short time, thereby protecting the circuit equipment from damage to a certain extent. After the voltage drops, the resistance of the resettable fuse PTC1 will decrease due to the decrease in temperature.

[0046] In the embodiments of this application, the first magnetic ring coil and the second magnetic ring coil act as common-mode inductors in the circuit. In a specific example, with 400 signal channels, the cost of the common-mode inductor is lower than that of a single-mode inductor. The use of a common-mode inductor can reduce manufacturing costs to a certain extent compared to the use of a single-mode inductor.

[0047] One end of the bidirectional transient suppression diode TVS1 is connected to the output terminal of the self-resetting fuse PTC1, and the other end of the bidirectional transient suppression diode TVS1 is grounded. The bidirectional transient suppression diode TVS1 is used to protect the filter protection circuit during lightning surges.

[0048] In this embodiment, when the voltage and current are normal, the resistance of the bidirectional transient suppression diode TVS1 is in a high-resistance state, i.e., in a cutoff state, which is equivalent to an open circuit in the circuit and will not affect the state and normal operation of the filter protection circuit. When the voltage in the circuit increases and reaches the breakdown voltage of the bidirectional transient suppression diode TVS1, the impedance of the bidirectional transient suppression diode TVS1 decreases and instantly changes from a high-resistance state to a low-resistance state. The bidirectional transient suppression diode TVS1 becomes a conducting state, which is equivalent to an open circuit in the circuit. At this time, the circuit where the bidirectional transient suppression diode TVS1 is located is in a low-resistance conducting state, causing the transient high current to flow to the ground.

[0049] One end of the decoupling resistor R1 is connected to the output terminal of the second magnetic ring coil, and the other end of the decoupling resistor R1 is connected to the output voltage. The decoupling resistor R1 is used to adjust the residual voltage at the output port.

[0050] The implementation principle of a lightning protection filter component for a multi-signal airborne controller according to an embodiment of this application is as follows: the first connector and the second connector on the filter circuit board are symmetrical about the center of the filter circuit board, which can limit the position of the input signal and the output signal on the filter circuit board. The filter circuit board is set between the compartment shell and the compartment partition, which can prevent interference from other circuits to the filter circuit board to a certain extent. At the same time, the setting of the input hole and the setting of the output hole can separate the input signal and the output signal. When the component is struck by lightning, the switch-type gas discharge tube G1, the self-resetting fuse PTC1 and the bidirectional transient suppression diode TVS1 protect the component, thereby reducing the damage of lightning strikes to the component to a certain extent, and thus avoiding the high-frequency interference coupling problem between the input signal and the output signal to a certain extent.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lightning protection filtering component for a multi-signal airborne controller, characterized in that, The system includes a filter circuit board, a compartment housing, and a compartment partition. The filter circuit board has a first connector, a second connector, and a filter protection circuit. The first and second connectors are located on opposite sides of the filter circuit board. The compartment housing includes a base plate and side plates. The filter circuit board is mounted on the base plate, and the side plates are arranged around the base plate, with the vertical plane of the side plates perpendicular to the horizontal plane of the base plate. An input hole is provided on the base plate, aligned with the first connector. The compartment partition is located on the side plates near the filter circuit board, with the horizontal plane of the compartment partition perpendicular to the horizontal plane of the side plates. An output hole is provided on the compartment partition. The output hole is aligned with the second connector; it also includes a filter magnetic ring, which includes a first magnetic ring coil and a second magnetic ring coil, which are sleeved on the filter circuit board; the first and second magnetic ring coils act as common-mode inductors in the filter protection circuit, which also includes an input voltage, a switchable gas discharge tube, a resettable fuse, a bidirectional transient suppression diode, a decoupling resistor, and an output voltage. One end of the input voltage is connected to the input terminal of the first magnetic ring coil, one end of the switchable gas discharge tube is connected to the input voltage, and the other end is grounded. The switchable gas discharge tube contains inert gas to protect the circuit during lightning strikes.

2. The lightning protection filtering component for a multi-signal airborne controller according to claim 1, characterized in that, The first magnetic ring coil and the second magnetic ring coil are shaped like a racetrack.

3. The lightning protection filtering component for a multi-signal airborne controller according to claim 1, characterized in that, It also includes a magnetic ring fixing clip, which is disposed on the magnetic ring coil and is used to fix the filter circuit board with the magnetic ring coil sleeved on it on the base plate.

4. The lightning protection filtering component for a multi-signal airborne controller according to claim 1, characterized in that, It also includes an input connector, a front panel housing, an adapter circuit board, and an input rectangular PCB connector. The input connector is fixedly mounted on the front panel housing and is used to connect to external signals. The adapter circuit board is located on the front panel housing near the compartment housing. The input rectangular PCB connector is located on the adapter circuit board near the compartment housing and is aligned with the first connector through the input hole.

5. The lightning protection filtering component for a multi-signal airborne controller according to claim 1, characterized in that, It also includes an output rectangular PCB connector, a lightning protection circuit board, a backplate housing, and an output connector. The lightning protection circuit board is disposed on the side of the compartment partition away from the compartment housing. The lightning protection circuit board is used to reduce the damage to the equipment caused by lightning strikes to a certain extent. The output rectangular PCB connector is disposed on the side of the lightning protection circuit board near the compartment partition. The output rectangular PCB connector is aligned with the second connector through the output hole. The backplate housing is disposed on the side of the compartment housing away from the bottom plate. The lightning protection circuit board is disposed between the compartment housing and the lightning protection circuit board. The output connector is disposed on the backplate housing away from the lightning protection circuit board. The output connector is used to transmit signals.

6. The lightning protection filtering component for a multi-signal airborne controller according to claim 1, characterized in that, One end of the self-resetting fuse is connected to the output terminal of the first magnetic ring coil, and the other end of the self-resetting fuse is connected to the input terminal of the second magnetic ring coil. The self-resetting fuse is used to delay and limit current during lightning surges.

7. The lightning protection filtering component for a multi-signal airborne controller according to claim 6, characterized in that, One end of the bidirectional transient suppression diode is connected to the output terminal of the self-resetting fuse, and the other end of the bidirectional transient suppression diode is grounded. The bidirectional transient suppression diode is used to protect the filter protection circuit during lightning surges.

8. The lightning protection filtering component for a multi-signal airborne controller according to claim 7, characterized in that, One end of the decoupling resistor is connected to the output terminal of the second magnetic ring coil, and the other end of the decoupling resistor is connected to the output voltage. The decoupling resistor is used to adjust the residual voltage at the output voltage output port.

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