A general test tool suitable for avionics card products
By using a modularly designed universal test fixture, the problems of high cost and long cycle of traditional test fixtures are solved, enabling rapid adaptation and efficient testing of avionics cards, reducing development costs and improving test stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
- Filing Date
- 2025-05-26
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional customized testing fixtures are costly and time-consuming to develop, making them unsuitable for large-scale, low-cost avionics card production.
The modularly designed universal test fixture includes a chassis, daughter card carrier board, power module, signal adapter board and motherboard, which supports rapid adaptation to different avionics cards and achieves reliable transmission of test signals through signal conversion and power conversion.
It reduces the development cost of test fixtures, improves development efficiency and test stability, and reduces the need for external simulation resources.
Smart Images
Figure CN224536086U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of avionics card product testing technology, specifically a general testing fixture applicable to avionics card products. Background Technology
[0002] Avionics cards are a crucial functional component of avionics equipment. They generally lack master control functions, undertaking only basic data communication or data conversion capabilities. By being installed in different avionics modules, they enable rapid functional expansion of those modules. When an avionics module malfunctions, replacing the avionics card allows for efficient fault isolation and repair / replacement. Furthermore, due to their strong adaptability, avionics cards can be used with different types of avionics modules and equipment, generally allowing for large-scale, low-cost mass production.
[0003] While different avionics cards have similar size ranges, their external mechanical interfaces and signal types vary. Traditional customized testing fixtures are costly to develop and have long development cycles, making them unsuitable for large-scale, low-cost daughter card production. Utility Model Content
[0004] The purpose of this invention is to provide a universal testing fixture applicable to avionics card products, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a universal testing fixture suitable for avionics card products, comprising a chassis, a daughter card carrier board, a power module, a signal adapter board, and a motherboard. The daughter card carrier board and the power module are both inserted inside the chassis. Several daughter card carrier boards are provided, the signal adapter board is located on the front of the chassis, and the motherboard is located at the bottom of the chassis. The chassis adopts a 6U standard VPX chassis.
[0006] The daughter card carrier board houses the avionics card body. Below the daughter card carrier board is a daughter card carrier board connector. The power module has a power connector. The signal adapter board has a first inter-board connector and an aviation connector. The motherboard has daughter card carrier board sockets, a power socket, and a second inter-board connector that mate with the daughter card connector, power connector, and first inter-board connector. The aviation connector enables signal transfer for the daughter card to communicate with external devices. The power module converts the externally input 28VDC power to a 5VDC output to meet the power supply requirements of the daughter card and other components on the daughter card carrier board.
[0007] As a preferred embodiment of this invention, a heat-conducting plate is provided on the side of the chassis to improve the heat dissipation effect of the chassis.
[0008] As a preferred embodiment of this utility model, a positioning bolt is provided at the lower part of the sub-card carrier plate near the side, and a positioning hole is provided at the position of each sub-card socket on the upper part of the mother plate. The positioning bolt is inserted into the positioning hole to restrict the sub-card carrier plate, so as to achieve the positioning effect when the sub-card carrier plate is inserted.
[0009] As a preferred embodiment of this invention, an auxiliary removal component is provided above the sub-card carrier plate to facilitate the removal of the sub-card carrier plate from the chassis.
[0010] As a preferred embodiment of this invention, a high-speed cable is connected between the first inter-board connector and the second inter-board connector to achieve the connection between the motherboard and the signal adapter board.
[0011] As a preferred embodiment of this utility model, a signal conversion module is provided at the bottom of the motherboard. The signal conversion module can be customized according to the actual needs of the avionics card to realize the function of converting the high-speed internal bus into a low-speed bus, so as to realize the reliable transmission of test signals during environmental testing.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] This utility model adopts a modular design concept. By replacing the sub-card carrier board, it can adapt to different avionics card products, realize the universality of test fixture chassis and motherboard, reduce the development cost of test fixtures, and improve the development efficiency of test fixtures. Some signals are self-looping, eliminating the need for a companion test module, reducing external simulation resources, lowering the cost of test fixtures, and improving the stability of test fixture experiments. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;
[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;
[0016] Figure 3 This is a schematic diagram of the signal adapter board structure of this utility model;
[0017] Figure 4 This is a schematic diagram of the mother plate structure of this utility model;
[0018] Figure 5 This is a schematic diagram of the sub-card carrier plate structure of this utility model;
[0019] Figure 6 This is a schematic diagram of the installation structure of the signal conversion module of this utility model;
[0020] Figure 7 This is a schematic diagram of the internal signal cross-linking of the first example of the avionics card testing fixture of this utility model;
[0021] Figure 8 This is a schematic diagram of the internal signal cross-linking of the second example of the avionics card testing fixture of this utility model.
[0022] In the diagram: 1. Chassis; 101. Heat sink; 2. Sub-card carrier board; 201. Avionics card body; 202. Sub-card plug; 203. Positioning pin; 204. Pull-out assembly; 3. Power module; 4. Signal adapter board; 401. First board connector; 402. Aviation connector; 5. Motherboard; 501. Second board connector; 502. Sub-card socket; 503. Power socket; 504. High-speed cable; 505. Signal adapter module; 506. Positioning socket. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.
[0024] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.
[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "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 utility model according to the specific circumstances.
[0026] Please see Figure 1 , 2This utility model provides a technical solution: a universal testing fixture suitable for avionics card products, including a chassis 1, a sub-card carrier board 2, a power module 3, a signal adapter board 4, and a motherboard 5. The sub-card carrier board 2 and the power module 3 are both inserted inside the chassis 1. Several sub-card carrier boards 2 are provided. The signal adapter board 4 is located on the front of the chassis 1, and the motherboard 5 is located at the bottom of the chassis 1. The chassis 1 adopts a 6U standard VPX chassis 1, which can install one power module and four sub-card carrier boards.
[0027] For further details, please refer to Figure 3-4 The sub-card carrier board 2 is provided with the avionics card body 201, the sub-card plug 202 is provided below the sub-card carrier board 2, the power module 3 is provided with the power plug, the signal adapter board 4 is provided with the first board connector 401 and the aviation connector 402, and the motherboard 5 is provided with the sub-card socket 502, the power socket 503 and the second board connector 501 that cooperate with the sub-card plug 202, the power plug and the first board connector 401.
[0028] The motherboard 5 is equipped with a total of 16 sets (32 pairs) of high-speed differential signal loopback interfaces, 32 pairs of high-speed differential signal adapters, and 32 single-ended signal adapter interfaces. It can convert RS232, SPI, and DVI signals, and loopback ARINC818, FC, and SRIO electrical signals.
[0029] Aviation connector 402 enables signal transfer for daughter cards to communicate with external devices.
[0030] Power module 3 converts the externally input 28VDC power supply into a 5VDC power output to meet the power supply requirements of the daughter card and other components on the daughter card carrier board 2.
[0031] Furthermore, a heat-conducting plate 101 is provided on the side of the chassis 1, which is used to improve the heat dissipation effect of the chassis 1.
[0032] Furthermore, a positioning bolt 203 is provided below the sub-card carrier plate 2 near the side, and a positioning hole 506 is provided above the mother plate 5 at the position of each sub-card socket 502. The positioning bolt 203 is inserted into the positioning hole 506 to restrict the sub-card carrier plate 2, so as to achieve the positioning effect when the sub-card carrier plate 2 is inserted.
[0033] Furthermore, an auxiliary removal component 204 is provided above the sub-card carrier plate 2 to facilitate the removal of the sub-card carrier plate 2 from the chassis 1.
[0034] Furthermore, a high-speed cable 504 is connected between the first board connector 401 and the second board connector 501 to enable the connection between the motherboard 5 and the signal adapter board 4.
[0035] Furthermore, a signal conversion module 505 is provided at the bottom of the motherboard 5. The signal conversion module 505 can be customized according to the actual needs of the avionics card to realize the function of converting the high-speed internal bus into a low-speed bus, so as to realize the reliable transmission of test signals during environmental testing. If the external communication interface of the avionics card has a low-speed bus, it is not necessary to customize and install this module.
[0036] In summary, this application uses two electronic avionics cards as examples for testing.
[0037] The first example is an avionics card. This avionics card mainly performs the conversion between SRIO signals and FC and ARINC818 signals, has an internal SPI communication bus, and uses 5VDC power supply. During the environmental testing of this avionics card, the interface was primarily tested. For economic reasons, as shown in the attached document... Figure 7 As shown, by using a customized daughter card carrier board 2, the SRIO, FC, and ARINC818 signals of the two avionics cards are self-looped through 6 sets (12 pairs) of high-speed differential signal interfaces on the motherboard 5. Data transmission and reception are performed inside the daughter card to test the interface. The SPI signals of the two avionics cards are output to the motherboard 5 through 8 single-ended signal interfaces. The motherboard 5 uses an SPI to RS422 signal conversion module to convert the SPI to RS422 signals and output them to the test fixture, realizing the conversion from high-speed internal bus to low-speed bus and reliable communication with external devices.
[0038] The second example is an avionics card. This avionics card mainly performs the conversion between A818 signals and DVI signals, has an RS232 communication interface, and uses 5VDC power supply. During the environmental testing of this avionics card, the interface was primarily tested. For economic reasons, as shown in the attached document... Figure 8 As shown, through a customized daughter card carrier board 2, 12 sets (24 pairs) of high-speed differential signals on the motherboard 5 are used to perform self-loopback on the ARINC818 and DVI signals of the two daughter cards. Data transmission and reception within the daughter cards are used to test the interfaces. 16 pairs of high-speed differential signals on the motherboard 5 are used to connect one DVI input signal, one DVI output signal, and one RS232 signal from the two daughter cards to the test fixture. This avionics card does not require a signal conversion module.
[0039] It is worth noting that the entire device is controlled by a master control button. Since the device matched with the control button is a common device and belongs to existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.
[0040] 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. A universal testing fixture applicable to avionics card products, characterized in that: The system includes a chassis (1), a sub-card carrier board (2), a power module (3), a signal adapter board (4), and a motherboard (5). The sub-card carrier board (2) and the power module (3) are both inserted inside the chassis (1). There are several sub-card carrier boards (2), the signal adapter board (4) is located on the front of the chassis (1), and the motherboard (5) is located below the chassis (1). The sub-card carrier board (2) is provided with an avionics card body (201), the sub-card carrier board (2) is provided with a sub-card plug (202) below it, the power module (3) is provided with a power plug, the signal adapter board (4) is provided with a first board connector (401) and an aviation connector (402), and the motherboard (5) is provided with a sub-card socket (502), a power socket (503), and a second board connector (501) that cooperate with the sub-card plug (202), the power plug, and the first board connector (401).
2. The universal testing fixture for avionics card products according to claim 1, characterized in that: A heat-conducting plate (101) is provided on the side of the chassis (1).
3. The universal testing fixture for avionics card products according to claim 1, characterized in that: The sub-card carrier plate (2) is provided with a positioning bolt (203) near the side below, and a positioning hole (506) is provided above the mother plate (5) at the position of each sub-card socket (502). The positioning bolt (203) is inserted into the positioning hole (506) to restrict the sub-card carrier plate (2).
4. The universal testing fixture for avionics card products according to claim 1, characterized in that: An auxiliary extraction component (204) is provided above the sub-card carrier plate (2).
5. A universal testing fixture for avionics card products according to claim 1, characterized in that: A high-speed cable (504) is connected between the first board connector (401) and the second board connector (501).
6. A universal testing fixture for avionics card products according to claim 1, characterized in that: The motherboard (5) is provided with a signal conversion module (505) at the bottom.