Lightning protection filtering assembly

Abstract

The utility model relates to the technical field of avionic equipment protection, in particular to a lightning protection filtering assembly. Comprising a shell, and a lightning protection module, an anti-reverse module and an EMI filtering module are packaged in the shell. The lightning protection module adopts a transient voltage suppressor (TVS) diode, the clamping voltages are 121V, 19.9 V and 72.7 V respectively, and the response time is less than or equal to 5 microseconds; the anti-reverse module is integrated at a power supply input end, a diode with reverse withstand voltage greater than or equal to 1200V is adopted, and the transient current bearing capacity is greater than or equal to 50A / mu s; the EMI filtering module comprises a pi-type filtering circuit topology; the input interface comprises two circular electric connectors (X1 and X2); and the output interface is a rectangular connector (J3) and is used for integrally outputting all signals and a power supply which are subjected to protection processing. According to the utility model, through module integration, interface centralization and passive high-reliability design, the space and resource waste is reduced, and the module has obvious volume, weight and performance advantages.

Description

Technical Field

[0001] This utility model relates to the field of protection technology for avionics equipment, specifically a lightning protection filter component. Background Technology

[0002] In avionics, due to the high degree of system integration and sensitivity to weight and size, traditional solutions require separate surge protection, filtering, and reverse connection protection modules for each power supply or signal, leading to the following problems:

[0003] 1. Exceeding size and weight limits: The discrete modules occupy a large space, which does not meet the lightweight requirements of aviation equipment;

[0004] 2. High installation complexity: Multiple connector interfaces increase wiring difficulty and the risk of failure;

[0005] 3. Insufficient reliability: Active devices (such as integrated circuits) are prone to failure under extreme temperatures.

[0006] Existing technologies, such as TE Connectivity's surge protection filtering modules, while providing single-function protection, lack multi-signal integration capabilities. Therefore, there is an urgent need for a highly integrated, wide-temperature-adaptable, passive, and highly reliable multi-functional surge protection filtering component. Utility Model Content

[0007] The problem to be solved is to address the integrated requirements for multiple power supplies and signal protection in avionics equipment, reduce size, weight and installation complexity, while improving environmental adaptability and reliability.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a lightning protection filter component, including a housing, in which a lightning protection module, an EMI filter module, and a reverse protection module are encapsulated, and the housing is provided with an input interface and an output interface;

[0009] Lightning protection module: Employs transient suppression diodes with clamping voltages of 121V, 19.9V, and 72.7V, and a response time ≤5μs;

[0010] Anti-reverse module: Integrated at the power input terminal, using a diode with a reverse withstand voltage ≥1200V and a transient current withstand capability ≥50A / ㎲;

[0011] EMI filtering module: includes a π-type filter circuit topology, which includes a power filter inductor and a filter capacitor;

[0012] Input interfaces: including input interface one and input interface two. Input interface one is an electrical connector X1, and input interface two is an electrical connector X2. Electrical connector X1 and electrical connector X2 support the input of 28V DC power supply, 422 differential communication signal, CAN bus signal and PT1000 temperature signal respectively.

[0013] Output interface: J3 rectangular connector, which integrates all protected signals and power outputs.

[0014] Preferably, the transient suppression diodes of the surge protection module meet the lightning protection level of IEC 6100045 standard, and the EMI filter module is configured with filtering processing for power supply, 422 differential signals and CAN communication signals.

[0015] Preferably, electrical connector X1 is an AVIC J599 / 20TC35PN type aviation electrical connector, defined to include a 28V power supply positive terminal, ground wire, 422 transmit / receive signals, and discrete signals; electrical connector X2 is an AVIC J599 / 20TB35SN type aviation electrical connector, defined to include an excitation signal, SIN / COS signals, and PT1000 temperature signals.

[0016] Preferably, the housing is made of aluminum alloy and the surface is treated with conductive oxidation.

[0017] Preferably, the diode in the anti-reverse module is a fast recovery diode with a reverse recovery time ≤50ns.

[0018] Preferably, the pin definitions of the rectangular connector J3 are mapped one-to-one with the signals of the electrical connectors X1 and X2, including 28V power supply output, 422 communication signal output, CAN bus signal output and PT1000 temperature signal output.

[0019] Compared with the prior art, the present invention provides a lightning protection filtering component, which has the following beneficial effects:

[0020] 1. Optimization of size and weight: The shell 1 measures 100mm×85mm×25mm and weighs ≤300g, which is more than 30% smaller than the traditional solution;

[0021] 2. Multifunctional integration: Full-link protection compatible with 28V power supply, 422 communication, CAN bus, and PT1000 temperature signal;

[0022] 3. Ultra-high reliability: Mean time between failures (MTBF) ≥ 100,000 hours under passive design;

[0023] 4. Adaptability to extreme environments: Passed the 55°C low-temperature start-up test and the 85°C high-temperature aging test. Attached Figure Description

[0024] Figure 1 This is the electrical schematic diagram of the lightning protection filter component of this utility model;

[0025] Figure 2 This is a schematic diagram of the external structure of the lightning protection filter component of this utility model;

[0026] Figure 3 This is a schematic diagram of the internal structure of the lightning protection filter component of this utility model;

[0027] Explanation of reference numerals in the attached diagram: 1. Housing; 11. Input interface one; 12. Input interface two; 13. Output interface; 2. Lightning protection module; 3. EMI filter module; 4. Reverse protection module. Detailed Implementation

[0028] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0029] This utility model of lightning protection filter component solves the integrated protection needs of multiple power supplies / signals, simplifies the installation process, and reduces space and resource waste.

[0030] like Figure 3 The diagram shown is a schematic representation of the internal structure of the lightning protection filter component of this utility model.

[0031] Module integration: The surge protection module 2, the reverse protection module 4, and the EMI filter module 3 are encapsulated in the same housing 1;

[0032] Interface centralization: The input interfaces include input interface 11 and input interface 12. Input interface 11 uses a circular electrical connector X1 to input signals, and input interface 12 uses a circular electrical connector X2 to input signals. Electrical connectors X1 and X2 support the input of 28V DC power, 422 differential communication signals, CAN bus signals, and PT1000 temperature signals, respectively. Output interface 13 is a rectangular connector J3, which integrates the output of all protected signals and power. Interface centralization can reduce the number of interfaces. Input interface 11, input interface 12, and output interface 13 are located on housing 1.

[0033] Passive design: using only passive components such as inductors, capacitors, and diodes to improve reliability; device circuit principle. Figure 1 As shown.

[0034] This utility model specifically relates to a composite protection component that integrates lightning protection, filtering, and reverse connection protection functions. It is suitable for electromagnetic compatibility (EMC) and lightning protection requirements of multiple power supplies (such as 28V DC power supply) and signals (422 differential communication, CAN bus, discrete signals, PT1000 temperature signals, etc.).

[0035] The surge protection module 2 uses transient suppression diodes with clamping voltages of 121V, 19.9V and 72.7V respectively, and a response time of ≤5μs, which complies with IEC 6100045 standard.

[0036] The reverse protection module 4 uses a fast recovery diode with a reverse withstand voltage ≥1200V, a reverse recovery time ≤5μs, and a transient current withstand capability ≥50A / ㎲. The reverse protection module 4 is integrated into the power input terminal.

[0037] The EMI filter module 3 adopts a π-type filter circuit topology, with power supply filter inductance values ​​of 9mH and 0.5mH, and filter capacitor values ​​of 2.2µF and 0.1µF. In addition, the EMI filter module 3 adds common-mode chokes for power supply, 422 signal and CAN signal.

[0038] Housing 1 is made of aluminum alloy (model 6061T6) with a conductive anodized surface, meeting the electromagnetic shielding effectiveness requirement of ≥30dB; Input interface X1 is an AVIC J599 / 20TC35PN aviation electrical connector, defining 28V power supply positive / negative terminals, 422 transmit / receive signals, and discrete signals; the following table shows the signal definitions of input interface X1 connector:

[0039]

[0040] The input interface X2 is an AVIC J599 / 20TB35SN aviation electrical connector, defining excitation signals (EX+ / EX), SIN / COS signals, and PT1000 temperature signals. The table below shows the signal definitions for the input interface X2 connector:

[0041]

[0042] Output interface 13 is a rectangular connector J3 (model J30J-25TJL). The pin definitions of the rectangular connector J3 are mapped one-to-one with the signals of input interface 11 and input interface 12, including 28V power supply output, 422 communication signal output, CAN bus signal output and PT1000 temperature signal output.

[0043] Environmental adaptability verification of this utility model component: temperature test range is 55°C (cold start) to 85°C (continuous operation for 1000 hours), performance degradation ≤5%; vibration test simulates aviation vibration environment according to GJB150 standard, no structural loosening or functional abnormality; after 48 hours of salt spray test, the shell 1 has no corrosion and the contact resistance change ≤10%.

[0044] This utility model component solves the pain points of multi-channel protection for avionics equipment through modular integration, centralized interfaces, and passive high-reliability design. It addresses the integrated protection requirements for multiple power / signal channels, simplifies the installation process, reduces space and resource waste, and has significant advantages in size, weight, and performance.

[0045] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A lightning protection filter assembly, characterized by: Includes a housing (1), inside which are encapsulated a lightning protection module (2), an EMI filter module (3), and an anti-reverse module (4), and the housing (1) is provided with an input interface and an output interface (13). Lightning protection module (2): It adopts transient suppression diodes with clamping voltages of 121V, 19.9V and 72.7V respectively, and response time ≤5μs; Anti-reverse module (4): Integrated into the power input terminal, using a diode with a reverse withstand voltage ≥1200V and a transient current withstand capability ≥50A / ㎲; EMI filtering module (3): includes a π-type filter circuit topology, which includes a power supply filter inductor and a filter capacitor; Input interface: includes input interface one (11) and input interface two (12). Input interface one (11) is electrical connector X1, and input interface two (12) is electrical connector X2. Electrical connector X1 and electrical connector X2 support the input of 28V DC power supply, 422 differential communication signal, CAN bus signal and PT1000 temperature signal respectively. Output interface (13): is a rectangular connector J3, which integrates all protected signals and power outputs.

2. The lightning protection filter assembly of claim 1, wherein: The transient suppression diode of the lightning protection module (2) meets the lightning protection level of IEC 6100045 standard, and the EMI filter module (3) is configured with filtering processing for power supply, 422 differential signal and CAN communication signal.

3. The lightning protection filter assembly of claim 2, wherein: Electrical connector X1 is an AVIC J599 / 20TC35PN aviation electrical connector, defined to include 28V power positive, ground, 422 transmit / receive signals and discrete signals; electrical connector X2 is an AVIC J599 / 20TB35SN aviation electrical connector, defined to include excitation signal, SIN / COS signal and PT1000 temperature signal.

4. The lightning protection filter assembly of claim 1, wherein: The housing (1) is made of aluminum alloy and the surface is treated with conductive oxidation.

5. The lightning protection filter assembly of claim 1, wherein: The diode in the anti-reverse module (4) is a fast recovery diode with a reverse recovery time ≤50ns.

6. The lightning protection filter assembly of claim 1, wherein: The pin definitions of the rectangular connector J3 are mapped one-to-one with the signals of the electrical connectors X1 and X2, including 28V power supply output, 422 communication signal output, CAN bus signal output and PT1000 temperature signal output.

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