Discrete line circuit conforming to civil aviation standard

Abstract

The utility model discloses a discrete line circuit conforming to civil aviation standards, which comprises a lightning protection transient induction circuit, a signal input end of the lightning protection transient induction circuit is connected with a discrete line interface to serve as a circuit input end, and a signal output end of the lightning protection transient induction circuit is connected with an isolation protection circuit; the output end of the isolation protection circuit is connected with a voltage comparison circuit, the signal output end of the voltage comparison circuit serves as the circuit output end, and the voltage input end of the voltage comparison circuit is further connected with a basic voltage adjusting circuit. According to the utility model, the problem that the discrete line state judgment is single because the discrete line judgment level cannot be adjusted in the prior art is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aviation electronics, and in particular relates to a discrete line circuit that meets civil aviation standards. Background Art

[0002] China is developing faster and faster in the fields of civil aviation and general aviation. In terms of civil aviation airborne equipment, it is gradually replacing imported equipment from abroad. During the installation and use of aviation equipment, various control technologies are also developing rapidly. Especially in the field of aviation equipment, discrete line control that complies with the ARINC standard is required. Discrete line control that complies with the standard is a control technology that ensures the safe use of equipment. Discrete line design technology that complies with the aviation radio equipment standard has become an indispensable technology.

[0003] In the use of aviation radio equipment, whether navigation or communication, the actual installation and operation of equipment often requires discrete line interface control or status detection. Discrete line interface circuits that comply with the ARING standard can ensure the stability of discrete line status and prevent it from being affected by the external airborne environment and causing false triggering of discrete line control status. Currently popular discrete line status reception designs generally use level conversion or dedicated discrete line chips. However, the lack of adjustable discrete line detection levels results in a single discrete line status determination method and is subject to environmental limitations in actual use. Utility Model Content

[0004] The purpose of the utility model is to provide a discrete line circuit that meets civil aviation standards, and solves the problem in the prior art that the discrete line judgment level cannot be adjusted, resulting in a single discrete line state judgment.

[0005] The technical solution adopted by the utility model is that the discrete line circuit that meets the civil aviation standards includes a lightning protection transient sensing circuit, the signal input end of the lightning protection transient sensing circuit is connected to the discrete line interface as the circuit input end, and the signal output end of the lightning protection transient sensing circuit is connected to the isolation protection circuit;

[0006] The output end of the isolation protection circuit is connected to the voltage comparison circuit, the signal output end of the voltage comparison circuit serves as the circuit output end, and the voltage input end of the voltage comparison circuit is also connected to the basic voltage adjustment circuit.

[0007] The utility model is also characterized in that:

[0008] The lightning protection transient induction circuit includes a transient suppression diode, a protection resistor and a non-polar capacitor; one end of the protection resistor is connected to the discrete line interface, and the other end is connected to the isolation protection circuit, one end of the transient suppression diode and one end of the non-polar capacitor through lines, and the other ends of the transient suppression diode and the non-polar capacitor are grounded.

[0009] The isolation protection circuit includes an isolation diode, a voltage regulator and a resistor a; the positive electrode of the isolation diode is connected to one end of the protection resistor through a line, the negative electrode of the isolation diode is connected to the positive electrode of the voltage regulator and one end of the resistor a through a line, the negative electrode of the voltage regulator is grounded, and the other end of the resistor a is connected to a power supply through a line.

[0010] The voltage comparison circuit includes a voltage comparator and a resistor b. The negative input of the voltage comparator is connected to the output of the isolation protection circuit. The output of the voltage comparator is connected to one end of the resistor b through a line. The other end of the resistor b is connected to a power supply. The positive input of the voltage comparator is connected to the basic voltage adjustment circuit through a line.

[0011] The basic voltage adjustment circuit includes a resistor C and an adjustable resistor. One end of the resistor C is connected to the positive input of the voltage comparator and one end of the adjustable resistor. The other end of the resistor C is grounded. The other end of the adjustable resistor is connected to a power supply.

[0012] The beneficial effects of the present utility model are:

[0013] (1) The discrete line circuit of the utility model complies with civil aviation standards by adopting a voltage comparison circuit to isolate the discrete line state from the use environment. The reference comparison voltage can be configured by selecting a suitable resistor. In the specific implementation, the voltage can be adjusted according to the use environment and requirements, and the discrete line state judgment threshold can be flexibly adjusted.

[0014] (2) The discrete line circuit of the utility model complies with civil aviation standards. Through the isolation voltage stabilization circuit, it is ensured that if a strong voltage or abnormal situation occurs in the discrete line in the environment, the internal part of the equipment can be protected from being affected, thereby ensuring the safety of the equipment itself.

[0015] (3) The utility model is a discrete line circuit lightning protection transient induction circuit that complies with civil aviation standards. The circuit is small in size and can be flexibly configured according to different protection level requirements, thereby increasing practicality and environmental adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the discrete line circuit of the utility model that complies with civil aviation standards;

[0017] Figure 2 The utility model is a circuit diagram of a discrete line circuit that complies with civil aviation standards.

[0018] In the figure, 1. Lightning protection transient induction circuit, 11. Transient suppression diode, 12. Protection resistor, 13. Non-polarized capacitor; 2. Isolation protection circuit, 21. Isolation diode, 22. Zener diode, 23. Resistor a; 3. Voltage comparison circuit, 31. Voltage comparator, 32. Resistor b; 4. Basic voltage adjustment circuit, 41. Resistor c, 42. Adjustable resistor. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1

[0021] This utility model complies with the discrete line circuit of civil aviation standards, such as Figure 1 As shown, it includes a lightning protection transient sensing circuit 1, the signal input end of the lightning protection transient sensing circuit 1 is connected to the discrete line interface as the circuit input end, and the signal output end of the lightning protection transient sensing circuit 1 is connected to the isolation protection circuit 2;

[0022] The output end of the isolation protection circuit 2 is connected to the voltage comparison circuit 3 , the signal output end of the voltage comparison circuit 3 serves as the circuit output end, and the voltage input end of the voltage comparison circuit 3 is further connected to the basic voltage adjustment circuit 4 .

[0023] By using the voltage comparison circuit 3 to isolate the discrete line state from the usage environment, the reference comparison voltage can be configured by selecting appropriate resistors. In specific implementation, the voltage can be adjusted according to the usage environment and requirements, and the discrete line state judgment threshold can be flexibly adjusted.

[0024] Example 2

[0025] Based on Example 1, the utility model comprises a lightning protection transient induction circuit 1 in a discrete line circuit that complies with civil aviation standards, including a protective resistor 12, a transient suppression diode 11, and a non-polar capacitor 13; one end of the series protection resistor 12 is connected to the discrete line input, and the other end is respectively connected to the positive input of the isolation diode 21 in the isolation protection circuit 2, and is also connected to one end of the transient suppression diode 11 and one end of the non-polar capacitor 13, and the other ends of the transient suppression diode 11 and the non-polar capacitor 13 are grounded.

[0026] The isolation protection circuit 20 includes an isolation diode 21, a voltage regulator 22, and a resistor a23; the positive electrode of the isolation diode 21 is connected to the output of the lightning protection transient sensing circuit 1, that is, connected to the non-polarized capacitor 13, and the negative electrode is connected to the positive electrode of the voltage regulator 22 and one end of the resistor a23. The negative electrode of the voltage regulator 22 is connected to the ground, and the other end of the resistor a23 is connected to the power supply.

[0027] The voltage comparison circuit 3 includes a voltage comparator 31 and a resistor b32; the output of the isolation protection circuit 2 is connected to the negative input of the voltage comparator 31, the output of the voltage comparator 31 is connected to one end of the resistor b32, the other end of the resistor b32 is connected to the power supply, and the positive input of the voltage comparator 31 is connected to the output of the basic voltage adjustment circuit 4.

[0028] Example 3

[0029] This utility model complies with the discrete line circuit of civil aviation standards, such as Figure 2 As shown, in the lightning protection transient induction circuit 1 composed of a protection resistor 12, a transient suppression diode 11, and a non-polar capacitor 13, one end of the protection resistor 12 is connected to the discrete line input, and the other end is respectively connected to the positive input of the isolation diode 21 in the isolation protection circuit 2 composed of a diode b21, a voltage regulator 22, and a resistor a23, and is also connected to one end of the transient suppression diode 11 and one end of the non-polar capacitor 13. The other ends of the transient suppression diode 11 and the non-polar capacitor 13 are grounded.

[0030] The negative electrode of the isolation diode 21 is connected to the positive electrode of the Zener diode 22 and one end of the resistor a23, the negative electrode of the Zener diode 22 is connected to the ground, and the other end of the resistor a23 is connected to the power supply. The output of the isolation protection circuit 2 is connected to the voltage comparison circuit 3 composed of the voltage comparator 31 and the resistor b32. Specifically, the negative input of the voltage comparator 31 is connected to the output of the isolation protection circuit, the output of the voltage comparator 31 is connected to one end of the resistor b32, and the other end of the resistor b32 is connected to the power supply. The positive input of the voltage comparator 31 is connected to the output of the basic voltage adjustment circuit 40 composed of the resistor C41 and the adjustable resistor 42. Specifically, one end of the resistor C41 is connected to one end of the adjustable resistor 42 and at the same time to the positive input of the voltage comparator 31, and the other end is grounded. The other end of the adjustable resistor 42 is connected to the power supply.

[0031] When in use, this discrete line circuit, which complies with civil aviation standards, connects the circuit input to the aircraft's discrete line interface. The discrete line status signal enters the lightning protection point transient sensing circuit 1 of this solution, which performs transient sensing protection and filtering on the discrete line status signal. The processed signal then passes through the isolation protection circuit 2 for isolation protection and level control, and then enters the voltage comparison circuit 3 for voltage comparison. The basic voltage output by the basic voltage adjustment circuit 4 enters the voltage comparison circuit 3, which compares the two voltages and outputs a status signal. The high level is then matched to the post-processing circuit via resistor B32.

Claims

1. Discrete line circuit that complies with civil aviation standards, characterized by: It comprises a lightning protection transient sensing circuit (1), wherein a signal input end of the lightning protection transient sensing circuit (1) is connected to a discrete line interface as a circuit input end, and a signal output end of the lightning protection transient sensing circuit (1) is connected to an isolation protection circuit (2); The output end of the isolation protection circuit (2) is connected to a voltage comparison circuit (3), the signal output end of the voltage comparison circuit (3) serves as a circuit output end, and the voltage input end of the voltage comparison circuit (3) is also connected to a basic voltage adjustment circuit (4).

2. The discrete line circuit according to claim 1, wherein: The lightning protection transient induction circuit (1) comprises a transient suppression diode (11), a protective resistor (12) and a non-polar capacitor (13); one end of the protective resistor (12) is connected to a discrete line interface, and the other end is respectively connected to the isolation protection circuit (2), one end of the transient suppression diode (11) and one end of the non-polar capacitor (13) through lines; the other ends of the transient suppression diode (11) and the non-polar capacitor (13) are grounded.

3. The discrete line circuit according to claim 2, wherein: The isolation protection circuit (2) comprises an isolation diode (21), a voltage regulator (22) and a resistor a (23); the positive electrode of the isolation diode (21) is connected to one end of the protection resistor (12) via a circuit, the negative electrode of the isolation diode (21) is connected to the positive electrode of the voltage regulator (22) and one end of the resistor a (23) via a circuit, the negative electrode of the voltage regulator (22) is grounded, and the other end of the resistor a (23) is connected to a power supply via a circuit.

4. The discrete line circuit according to claim 1, wherein: The voltage comparison circuit (3) comprises a voltage comparator (31) and a resistor b (32); the negative input of the voltage comparator (31) is connected to the output of the isolation protection circuit (2); the output of the voltage comparator (31) is connected to one end of the resistor b (32) via a line; the other end of the resistor b (32) is connected to a power supply; and the positive input of the voltage comparator (31) is connected to the basic voltage adjustment circuit (4) via a line.

5. The discrete line circuit according to claim 4, which complies with civil aviation standards, The basic voltage adjustment circuit (4) comprises a resistor C (41) and an adjustable resistor (42), one end of the resistor C (41) is simultaneously connected to the positive input of the voltage comparator (31) and one end of the adjustable resistor (42), the other end of the resistor C (41) is grounded, and the other end of the adjustable resistor (42) is connected to a power supply.

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