Automatic switching device for electric signals of avionics products

Abstract

The utility model belongs to the field of avionics system test technology, especially relate to a kind of automatic switching equipment of avionics product electric signal. Including: panel, discrete quantity board card, multiple multichannel relay;Panel is equipped with real piece signal input interface, simulation signal input interface, signal output interface, RS232 interface, power interface and ground interface;RS232 is connected host computer outside, and is connected the input end of discrete quantity board card inside;The output end of discrete quantity board card is connected the control end of each way of multichannel relay;The a of each way relay, b signal input end is connected real piece signal input interface and simulation signal input interface respectively, and the signal output end of each way relay is connected signal output interface;Simulation signal input interface is connected simulation board card outside;Real piece signal input interface is connected the airborne product A that can be simulated by simulation board card outside;Signal output interface is connected other airborne product that is associated with airborne product A and is debugged.

Description

Technical Field

[0001] This utility model belongs to the field of avionics system testing technology, and in particular relates to an automatic switching device for electrical signals of avionics products. Background Technology

[0002] As the integration level of aircraft avionics systems continues to increase, the bus signals connecting airborne equipment are becoming increasingly complex. During the development, testing, and troubleshooting of avionics systems, it is necessary to connect various bus signals to different devices and environments for testing and verification.

[0003] The integration testing of T1 avionics products is divided into several testing phases, including T3 equipment-level semi-physical testing, T2 subsystem semi-physical testing, and T1 full system integration testing. Various types of airborne products participate in different phases of testing to achieve interface testing and data monitoring of various buses. To address the issues of missing components and the inability to test certain functions of physical components (atmospheric probes, inertial navigation devices, temperature sensors, etc.) under laboratory conditions, simulated signals are used to replace physical components for joint testing with other airborne products.

[0004] Signal switching equipment and corresponding signal switching software need to be designed to enable flexible switching between real and simulated avionics / electromechanical systems, which will facilitate the expansion of real system resources.

[0005] Mature commercial signal switching equipment for shelving systems uses an FPGA as the main control device, integrating FPGA, FLASH storage circuits, clock circuits, communication interfaces, I / O interfaces, and other functional modules to achieve switching between bus signals and low-current non-bus signals. However, commercial signal switching equipment suffers from long procurement cycles, high operating costs, and does not support the switching of high-current electrical signals. Utility Model Content

[0006] Purpose of this utility model: To provide an automatic switching device for electrical signals of avionics products, capable of automatically switching between bus electrical signals such as RS422 and ARINC429, and non-bus electrical signals such as discrete quantities, analog quantities, and power supplies. The automatic switching device has a reserved monitoring interface, supporting the on-demand connection of airborne product signals to monitoring resources.

[0007] During the avionics system integration test, when some airborne products are missing, the system can automatically switch from real component signals to simulation signals to ensure the normal integration test of other airborne products; it can automatically switch between real and simulation signals for airborne products such as atmospheric probes and inertial navigation devices to support dynamic simulation in the laboratory; and it can switch between real and simulation signals for airborne products such as temperature sensors that cannot be tested under laboratory conditions to ensure the normal progress of the integration test.

[0008] Technical solution: An automatic switching device for electrical signals of avionics products includes: a panel, a discrete quantity board, and multiple multi-channel relays; The panel is equipped with a real signal input interface, a simulation signal input interface, a signal output interface, an RS232 interface, a power interface, and a grounding interface; The RS232 connector connects to a host computer externally and to the input terminal of a discrete quantity converter board internally. The output of the discrete quantity circuit board is connected to the control terminal of each of the multiple relays. The a and b signal input terminals of each relay are connected to the real signal input interface and the simulation signal input interface, respectively, and the signal output terminal of each relay is connected to the signal output interface. The simulation signal input interface connects to an external simulation board. The actual component's signal input interface can be connected to an airborne product A that can be simulated by a simulation board. The signal output interface connects to other airborne products that are integrated with airborne product A for testing.

[0009] Furthermore, the panel also includes: a monitoring signal interface; The monitoring signal interface connects internally to the a and b signal input terminals of multiple relays as needed, and externally to monitoring boards; The monitoring board is used to collect signals between other airborne products and airborne product A or the simulation board in real time.

[0010] Furthermore, the power interface connects to 220V AC mains power.

[0011] Furthermore, the automatic switching device also includes: an AC-DC 5V power supply; The AC-DC 5V power supply is connected to the power interface, which converts the power to supply power to the discrete quantity circuit board and multiple multi-channel relays, and at the same time provides a reference voltage for the discrete quantity circuit board.

[0012] Furthermore, the AC-DC 5V power supply converts 220V AC mains power into 5V DC power.

[0013] Furthermore, the host computer sends control signals to connect the output of each relay to either the A signal input or the B signal input.

[0014] Beneficial effects: 1. The switching device has a simple structural design, readily available materials, and low cost; 2. It can not only adapt to common electrical bus signal switching such as RS422 and ARINC429, but also adapt to high current signals such as discrete quantities, analog quantities, electronic loads, and power supplies, making it widely applicable; 3. The test configuration can be flexibly designed according to project needs. Simply combine the discrete quantities as needed in the software operation interface, and control the output of the combined discrete quantities to switch the real component signal of a product / subsystem to the simulation signal. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a signal switching device.

[0016] Figure 2 This is a schematic diagram of a low-cost automatic signal switching scheme.

[0017] Figure 3 This is a schematic diagram of the signal switching device panel.

[0018] Figure 4 This is the internal wiring diagram of the signal switching device.

[0019] Figure 5 Example diagram of signal switching device usage scenarios Detailed Implementation To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] An automatic signal switching device for avionics products consists of low-cost hardware such as discrete quantity circuit boards, multi-channel relays, and DC power supplies. Depending on the number of signals to be switched and the complexity of the configuration, the automatic signal switching device can be designed centrally in an adapter box / wiring box, or it can be designed as a separate device.

[0024] The principle of signal switching equipment is as follows Figure 1 As shown, the signal sent by product A is received by product B by default. When product A is not present, the program controls a relay to automatically switch the signal from product A to the simulation signal, achieving automatic switching of the semi-physical simulation configuration. Additionally, acquisition resources can be connected to the signal link as needed to achieve bypass signal acquisition.

[0025] To achieve automated switching from real device signals to simulated signals, a low-cost automatic signal switching device was designed. The device scheme is as follows: Figure 2 As shown.

[0026] A multi-channel relay is selected to interrupt the signal between airborne product A and other airborne products (B, C…N). The signal of airborne product A is connected to the relay's "NO contact," the signals of other airborne products are connected to the relay's "COM contact," the signal of the simulation board is connected to the relay's "NC contact," and the signal of the monitoring board is connected to the "COM contact." The multi-channel relay and the discrete quantity distribution board are powered by a 5V DC power supply, which also serves as the reference power supply for the discrete quantity distribution board.

[0027] By default, airborne product B is connected to other airborne products via airborne cables and multiple relays. Using a discrete quantity control board to control the opening and closing of relay channels allows for automatic switching between real and simulated signals.

[0028] Based on the joint testing scenario, the signals are combined into different configurations. Using a discrete quantity board, one channel controls multiple channels of the relay, which can realize the automatic switching of real and fake component signals of a configuration.

[0029] Example The automatic switching device of this utility model was used in a T1 avionics electromechanical system integration verification environment. The automatic signal switching device is designed according to a standard 4U rack-mount chassis, and the rear panel of the designed automatic signal switching device is as follows... Figure 3As shown, the equipment is designed with four types of aviation plugs: "real signal input", "simulation signal input", "signal output" and "monitoring signal", RS232 programmable interface and 220V AC mains input interface.

[0030] Internal wiring of the equipment, such as Figure 4 As shown.

[0031] The COM pin of the multi-channel relay is connected to the "Signal Output Connector", the NC pin is connected to the "Simulation Signal Connector", and the NO pin is connected to the "Real Signal Input Connector". The COM pin is connected to the "Signal Monitoring Connector" according to the monitoring requirements.

[0032] The discrete output pin of the discrete quantity board is connected to the relay input IN pin, and the RS232 input pin of the discrete quantity board is connected to the RS232 of the automatic signal switching device.

[0033] The 5V DC power supply 220V input pin is connected to the AC220V power supply input pin of the signal automatic switching device, and the 5V direct power supply output pin is connected to the power supply pin of the multi-channel relay, the power supply pin of the discrete quantity board, and the reference voltage pin of the discrete quantity board.

[0034] The "Real Signal Input" connector is used to introduce signals that require switching between real and simulated signals. The "Simulation Signal Input" connector is used to introduce signals from simulation resources. The "Signal Output" connector is used to send the processed signals from the signal switching device back to the airborne product. The "Monitoring Signal" connector is used to access bypass monitoring resources as needed. The "RS232 Interface" is used to communicate with the main control computer in the test environment. With the help of simple control software, the switching between real and simulated signals can be realized.

[0035] In a certain T1 avionics and electromechanical system integration verification environment, all external bus electrical signals and non-bus electrical signals of airborne product A are treated as a configuration. The external signals of airborne product A are extracted and connected to relays using adapter cables. When airborne product A is not present, the voltage output of the discrete quantity can be controlled to switch the signals of the actual airborne product A to the simulated signals. The simulated resources are used to replace product A to support system integration testing.

[0036] Example of using an automatic signal switching device Figure 5As shown, airborne product A interacts with multiple airborne products. To address the switching requirements between real and simulated signals from airborne product A, the system cable connectors are separated. Custom adapter cable 1 connects the airborne product A connector to the "real signal input" connector of the automatic signal switching device. Custom adapter cable 2 connects the system cable connector to the "signal output" connector of the automatic signal switching device. Custom adapter cable 3 connects the simulated board to the "simulated signal input" connector of the automatic signal switching device. Custom adapter cable 4 connects the monitoring board to the "monitoring signal" connector of the automatic signal switching device. This enables the switching from airborne product A signals to simulated signals, ensuring normal interoperability testing of other airborne products. Simultaneously, it allows for bypass acquisition of signals between other airborne products and airborne product A or the simulated board.

[0037] The above description is merely a specific embodiment of this utility model, providing a detailed description of the utility model. Parts not covered in detail are conventional techniques. However, the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the protection scope of this utility model. The protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An automatic switching device for electrical signals of avionics products, characterized in that: The device includes: a panel, a discrete quantity board, and multiple multi-channel relays; The panel is equipped with a real signal input interface, a simulation signal input interface, a signal output interface, an RS232 interface, a power interface, and a grounding interface; The RS232 connector connects to a host computer externally and to the input terminal of a discrete quantity converter board internally. The output of the discrete quantity circuit board is connected to the control terminal of each of the multiple relays. The a and b signal input terminals of each relay are connected to the real signal input interface and the simulation signal input interface, respectively, and the signal output terminal of each relay is connected to the signal output interface. The simulation signal input interface connects to an external simulation board. The actual component's signal input interface can be connected to an airborne product A that can be simulated by a simulation board. The signal output interface connects to other airborne products that are integrated with airborne product A for testing.

2. The automatic switching device according to claim 1, characterized in that: The panel also includes: a monitoring signal interface; The monitoring signal interface connects internally to the a and b signal input terminals of multiple relays as needed, and externally to monitoring boards; The monitoring board is used to collect signals between other airborne products and airborne product A or the simulation board in real time.

3. The automatic switching device according to claim 1, characterized in that: Connect the power interface to 220V AC power.

4. The automatic switching device according to claim 3, characterized in that: The automatic switching device also includes: an AC-DC 5V power supply; The AC-DC 5V power supply is connected to the power interface, which converts the power to supply power to the discrete quantity circuit board and multiple multi-channel relays, and at the same time provides a reference voltage for the discrete quantity circuit board.

5. The automatic switching device according to claim 4, characterized in that: The AC-DC 5V power supply converts 220V AC mains power to 5V DC power.

6. The automatic switching device according to claim 1, characterized in that: The host computer sends control signals to connect the output of each relay to the A signal input or the B signal input.

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