PCB (printed circuit board) card for FC1553 signal transmission and avionics system

Abstract

The utility model provides a PCB (printed circuit board) card for FC1553 signal transmission and an avionics system in order to solve the problem of short signal transmission distance of an FC1553 bus in the prior art, and belongs to the technical field of avionics. The board card is composed of a device A, a device B, a via hole and a copper laying plane. Signal transmission is carried out between the device A and the device B through an FC1553 bus. The FC1553 + pin of the device A and the FC1553 + pin of the device B are arranged on the surface layer of the PCB card, a single-end signal mode is adopted for wiring, and the FC1553-pin of the device A and the FC1553-pin of the device B are arranged in a copper laying plane mode. The FC1553 + wire is located on the surface layer of the PCB card, and the FC1553-wire is located on other layers of the PCB card. According to the wiring mode, the signal loss is reduced, the signal transmission distance is increased, the impedance between the pins of the device A and the device B is accurately matched, and the signal reflection is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of avionics technology, especially relate to a PCB board card for FC1553 signal transmission and avionics system. BACKGROUND

[0002] The working frequency of FC1553 bus is 1Mb / s, adopts Manchester II code to encode, transmission mode is half duplex, and each data is composed of 20 bits, including 3 bits of synchronization head, 16 bits of information bit and 1 bit of parity check bit. Message format includes command word, data word and state word, and adopts command / response mode to transmit. The signal is widely applied in avionics system. The PCB board card for FC1553 signal transmission can realize signal transmission between different devices by FC1553 bus.

[0003] In the existing PCB board card for FC1553 signal transmission, FC1553 bus is wired in differential signal mode, which can cause great loss, shorten the signal transmission distance greatly, and the transmission distance is only 5 meters. UTILITY MODEL CONTENTS

[0004] The utility model discloses to solve the problem of short FC1553 bus signal transmission distance in the prior art, provide a kind of PCB board card for FC1553 signal transmission and avionics system.

[0005] The technical scheme adopted by the utility model is:

[0006] A kind of PCB board card for FC1553 signal transmission, including: device A, device B, single-ended signal wire, copper plane A and copper plane B are laid;

[0007] PCB board card body has via hole A, via hole B and via hole C;

[0008] Device A has 2 FC1553 bus pins, which are FC1553+ pin and FC1553- pin respectively;Device A is located in the surface layer of PCB board card;

[0009] Device B also has 2 FC1553 bus pins, which are FC1553+ pin and FC1553- pin respectively;Device B is also located in the surface layer of PCB board card;The FC1553+ pin of device B is connected with the FC1553+ pin of device A by single-ended signal wire;FC1553+ signal is transmitted to the FC1553+ pin of device B from the FC1553+ pin of device A by single-ended signal wire;

[0010] The copper plane A is located on the second layer of the PCB card, and is connected with the FC1553-pin of the device A through the via hole A;

[0011] The copper plane B is located on the third layer of the PCB card, is connected with the copper plane A through the via hole C, is connected with the FC1553-pin of the device B through the via hole B, and the FC1553 signal is transmitted from the FC1553-pin of the device A to the FC1553-pin of the device B through the via hole A, the copper plane A, the via hole C, the copper plane B and the via hole B in sequence.

[0012] Further, the matching impedance of the FC1553-pin of the device A and the device B to the FC1553+ pin is 100 ohms.

[0013] Further, the via hole A is a blind hole, which does not penetrate the whole PCB card, can reduce the coupling degree of the signal with other layer signals in the transmission process, reduce crosstalk, help to ensure the stability and integrity of the FC1553 signal, and prevent signal distortion and error rate rising.

[0014] Further, the via hole B is a blind hole.

[0015] Further, the via hole C is a buried hole, which does not directly contact with the outside world, is less affected by external electromagnetic interference, provides a more stable path for the internal transmission of the FC1553 signal, and further enhances the integrity and reliability of the signal.

[0016] Based on the same inventive concept, the utility model also provides an avionics system, which comprises the PCB card for FC1553 signal transmission.

[0017] The utility model has the advantages of:

[0018] The FC1553+ pin of the device A and the device B adopts a single-ended signal mode wiring, and the FC1553-pin adopts a plane mode wiring, which reduces the signal loss, increases the signal transmission distance, and solves the problem of short signal transmission distance of the FC1553 bus in the prior art. In addition, the impedance between the device A 11 and the device B 12 pin is accurately matched, the signal reflection is reduced, the error rate is reduced, the data accuracy is ensured, the blind hole design reduces crosstalk, the buried hole suppresses electromagnetic interference, and the signal transmission is stable. In the avionics system, the data transmission reliability is improved, the smooth operation of key links such as flight control and communication is ensured, the system stability is enhanced, the fault is reduced, and the long-time and high-load stable operation of the system is laid. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 A PCB card profile for FC1553 signal transmission;

[0021] Figure 2 A schematic view of the top view of the connection mode of the copper plane A and the copper plane B in the PCB card for FC1553 signal transmission. DETAILED DESCRIPTION

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of a specific example are described in the following. Of course, they are only examples, and the purpose is not to limit the present application.

[0024] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0025] The PCB card for FC1553 signal transmission disclosed in the present embodiment comprises the following components: device A 11, device B 12, single-ended signal wire 2, copper plane A 41, copper plane B 42, via hole A 31, via hole B 32 and via hole C 33, as shown in the accompanying drawings. Figure 1 The above components, the connection relationship between the components and the working principle are described in detail below.

[0026] The detailed components of the PCB card for FC1553 signal transmission are as follows:

[0027] Devices A11 and B12 are both located on the top layer 51 of the PCB board. These two devices are key nodes for FC1553 signal transmission, responsible for signal sending and receiving. The FC1553 signal consists of two signals: FC1553+ and FC1553-. Devices A11 and B12 each have two FC1553 bus pins. Device A11's FC1553+ bus pin is FC1553+_A112, and its FC1553- bus pin is FC1553-_A111. Device B12's FC1553+ bus pin is FC1553+_B121, and its FC1553- bus pin is FC1553-_B122.

[0028] Single-ended signal trace 2 is used to connect FC1553+_A112 and FC1553+_B121, enabling the transmission of FC1553+ signals from device A11 to device B12.

[0029] The copper-plated plane A41 is located on the second layer (52) of the PCB board and is connected to FC1553-_A111 via via A31. (See attached image) Figure 1 and attached Figure 2 As shown.

[0030] Copper plane B42 is located on the third layer (53) of the PCB board. It is connected to copper plane A41 via via C33, and also connected to FC1553-_B122 via via B32, providing a path for the transmission of FC1553- signals. (See attached image) Figure 1 and attached Figure 2 As shown.

[0031] Via A31 is a blind via that connects the copper-pave plane A41 and FC1553-_A111. It does not penetrate the entire PCB board, which helps to reduce the coupling degree of signals with other layers during transmission, reduce crosstalk, ensure the stability and integrity of FC1553 signals, and prevent signal distortion and increased bit error rate.

[0032] Via B32 is also a blind via, connecting the copper pour plane B42 and FC1553-_B122.

[0033] Via C33 is a buried via that connects copper plane A41 and copper plane B42. It does not directly contact the outside world and is less affected by external electromagnetic interference. It provides a more stable path for the internal transmission of FC1553 signals, further enhancing the integrity and reliability of the signals.

[0034] The connection relationships between components are as follows:

[0035] FC1553+_A112 is connected with FC1553+_B121 through single-ended signal wire 2, forming a transmission link of FC1553+ signal.

[0036] FC1553-_A111 is connected with copper-plated plane A41 through via hole A31, copper-plated plane A41 is connected with copper-plated plane B42 through via hole C33, and copper-plated plane B42 is connected with FC1553-_B122 through via hole B32, forming a transmission path of FC1553- signal.

[0037] The working principle of FC1553 signal transmission is as follows:

[0038] FC1553+ signal transmission: when device A11 needs to send FC1553+ signal to device B12, the signal is sent from FC1553+_A112, transmitted to FC1553+_B121 through single-ended signal wire 2, thereby realizing one-way transmission of the signal and providing a basic signal transmission channel for subsequent data interaction and other operations.

[0039] FC1553- signal transmission: the transmission process of FC1553- signal is relatively complex. The signal is sent from FC1553-_A111, first transmitted to copper-plated plane A41 through via hole A31, then transmitted and distributed to a certain extent on copper-plated plane A41. Then, the signal is transmitted from copper-plated plane A41 to copper-plated plane B42 through via hole C33, continues to transmit on copper-plated plane B42, and finally reaches FC1553-_B122 through via hole B32, completing the transmission process of FC1553- signal.

[0040] In the whole signal transmission process, the matching impedance of device A11 and FC1553-_B122 relative to FC1553+ pin is set to 100 ohms. This impedance matching helps to ensure the transmission quality of the signal, reduce adverse phenomena such as signal reflection, so that the FC1553 signal can be stably and reliably transmitted on the PCB card, meeting the requirements of high precision and high reliability of signal transmission in the scene of avionics system. The impedance design does not involve series and parallel devices, but only the wiring impedance of the PCB board. The impedance design is controlled by the manufacturer of the PCB, and the width of the wire in the production process, the thickness of the PCB board, and the medium of different layers will all affect the impedance.

[0041] The wiring mode of the PCB card for FC1553 signal transmission disclosed in the embodiment reduces signal loss, increases signal transmission distance (the improved wiring mode signal can be transmitted for 60 meters), and solves the problem of short signal transmission distance of the FC1553 bus in the prior art. In addition, the impedance between the device A11 and the device B12 pin is accurately matched, signal reflection is reduced, error rate is reduced, data accuracy is ensured, blind hole design reduces crosstalk, buried hole suppresses electromagnetic interference, and signal transmission is stable. In the avionics system, the data transmission reliability is improved, the smooth operation of key links such as flight control and communication is ensured, the system stability is enhanced, the failure is reduced, and the foundation for long-time and high-load stable operation of the system is laid.

Claims

1. A PCB card for FC 1553 signal transmission, characterized in that, The application relates to a PCB board card for FC1553 signal transmission. The PCB board card comprises a device A, a device B, a single-end signal wire, a copper-plated plane A and a copper-plated plane B. The PCB board card has a via hole A, a via hole B and a via hole C on the PCB board card body. The device A has two FC1553 bus pins, namely an FC1553+ pin and an FC1553- pin. The device B also has two FC1553 bus pins, namely an FC1553+ pin and an FC1553- pin. The FC1553+ pin of the device B is connected with the FC1553+ pin of the device A through the single-end signal wire. The FC1553+ signal is transmitted from the FC1553+ pin of the device A to the FC1553+ pin of the device B through the single-end signal wire. The copper-plated plane A is located on the second layer of the PCB board card.

2. The PCB board card for FC1553 signal transmission according to claim 1, wherein, The FC1553- pin of the device A is connected with the FC1553- pin of the device B through the via hole A, the copper-plated plane A, the via hole C, the copper-plated plane B and the via hole B.

3. The PCB card for FC 1553 signal transmission according to claim 1, wherein, The matching impedance of the FC1553- pins of the device A and the device B to the FC1553+ pin is 100 ohms.

4. The PCB card for FC 1553 signal transmission according to claim 1, wherein, The via hole A is a blind hole.

5. The PCB card for FC 1553 signal transmission according to any one of claims 1-4, characterized in that, The via hole B is a blind hole.

6. An avionics system, characterized by The via hole C is a buried hole. The PCB board card for FC1553 signal transmission comprises the device A, the device B, the single-end signal wire, the copper-plated plane A and the copper-plated plane B.

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