CN217386167U

CN217386167U - ARINC429 bus demodulation circuit based on general device realization

Info

Publication number: CN217386167U
Application number: CN202122597237.0U
Authority: CN
Inventors: 夏春翔; 王文涛; 张海波; 王帅
Original assignee: Beijing Andawell Ltd
Current assignee: Beijing Andawell Ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-09-06
Anticipated expiration: 2031-10-27

Abstract

The utility model discloses a ARINC429 bus demodulation circuit based on general device is realized, including bleeder circuit and double-circuit comparator, replace foreign ARINC429 bus protocol chip, realized the conversion of ARINC429 level signal to TTL signal. The used devices are mature common devices, the cost of the devices is effectively reduced, the shelf life and the goods failure risk are reduced, so that the foreign monopoly is broken, the localization and the independent controllability of the technology are realized by using the domestic common devices in the later period, and the device has higher practical value and economic value.

Description

ARINC429 bus demodulation circuit based on general device realization

Technical Field

The utility model relates to an aviation communication circuit field especially relates to a ARINC429 bus demodulation circuit based on general device realizes.

Background

ARINC429 is one of the most common communication buses for airborne equipment.

The common modulation and demodulation method for ARINC429 bus signal level comprises the following steps: 1) the conversion between ARINC429 bipolar return-to-zero signals and TTL signals is realized through an ARINC429 level conversion chip; 2) the ARINC429 can be transmitted and received by directly using a special protocol chip through buses such as SPI and the like. The most widely used level conversion chips and protocol chips are currently based on the chip of HOLT corporation. But the method is imported abroad, has long period of source and high price and has no domestic substitution. Meanwhile, the stability of the product is general, and problems are easy to occur.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an ARINC429 bus demodulation circuit based on general device is realized to solve the aforementioned problem that exists among the prior art.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

an ARINC429 bus demodulation circuit realized based on a general device comprises a voltage division circuit and a two-way comparator; the voltage division circuit is used for carrying out voltage division processing on two paths of high input signals of ARINC429 and low input signals of ARINC429, respectively connecting the high voltage division end and the low voltage division end of the two paths of input signals into the negative input end and the positive input end of the two-way comparator, and comparing the level through the two-way comparator and outputting a level signal.

Furthermore, the voltage dividing circuits are divided into two groups, the first group is formed by connecting resistors R1, R3, R5 and R7 in series, and the second group is formed by connecting resistors R2, R4, R6 and R8 in series; the two-way comparator comprises a first comparator and a second comparator, wherein a pin 2 of the first comparator is connected with the middle ends of the resistor R2 and the resistor R4, one end of a pin 3 is connected with the middle ends of the resistor R5 and the resistor R7, and is simultaneously connected with a pin 1 through a resistor R9; a pin 6 of the second comparator is connected with the middle ends of the resistor R1 and the resistor R3, a pin 5 is connected with the middle ends of the resistor R6 and the resistor R8, and is connected with a pin 7 through a resistor R10; the first comparator and the second comparator are respectively externally connected with a working power supply.

Furthermore, the first comparator and the second comparator are the same chip, and only the first comparator is externally connected with a working power supply.

The utility model has the advantages that:

the utility model discloses use general devices such as comparator to set up modulation circuit and realize ARINC429 level signal to the conversion of TTL signal, general device is ripe device commonly used. And the realization of the method is that,

1) the multi-channel transceiving is convenient to realize, only the signal modulation circuit needs to be instantiated for how many channels are applied, the occupied board distribution area of the circuit is small, and resources are saved;

2) the device replaces a foreign ARINC429 bus protocol chip, effectively reduces the cost of components, reduces the shelf life and the risk of goods break, breaks the foreign monopoly, and realizes the localization and the independent control of the technology by using a domestic universal device in the later period.

Drawings

Fig. 1 is a circuit connection diagram of an ARINC429 bus demodulation circuit implemented based on general-purpose devices;

fig. 2 is a modulation channel timing diagram of the embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

As shown in FIG. 1, the utility model discloses ARINC429 bus demodulation circuit based on general device realizes is used for converting ARINC429 level signal into TTL level signal. In the circuit, firstly, voltage division processing is carried out on ARINC429 input high signals and ARINC429 input low signals through two groups of voltage division circuits, high voltage division ends and low voltage division ends of two paths of input signals are respectively connected to a negative input end and a positive input end of a comparator, and level comparison is carried out through the two paths of comparators. When the input of the front end ARINC429 is high level, the input of the ARINC429 is low and negative level, the pin 1 of the first comparator outputs 3.3V high level, the pin 7 of the second comparator outputs 0 level, the input of the front end ARINC429 is high level in the same way, and when the input of the ARINC429 is low level, the reverse form is output. The specific connection mode is as follows: the resistors R1, R3, R5 and R7 are connected in series, and the resistors R2, R4, R6 and R8 are connected in series. Pin 2 of the first comparator is connected to the middle terminals of resistors R2 and R4, and pin 3 is connected to the middle terminals of resistors R5 and R7 through resistor R9 and pin 1. The pin 6 of the second comparator is connected to the middle terminals of the resistors R1 and R3, and the pin 5 is connected to the middle terminals of the resistors R6 and R8, and is connected to the pin 7 through the resistor R10. The first comparator and the second comparator are the same chip, so that the pin 8 of the first comparator is connected with a power supply, and the pin 4 is grounded. The ARINC429 level is converted into two paths of 3.3V TTL levels by the circuit based on the connection mode.

In the embodiment, based on an FPGA (XC7K325T) platform, FPGA software is programmed to analyze TTL level signals modulated by a modulation circuit, a system clock is set to be 50MHz, the transmission baud rate is 100Kb/s, the word interval is set to be 5, odd check is adopted, and an actually-measured demodulated data waveform diagram is shown in FIG. 2. It can be seen that the actual test waveform is consistent with the data signal characteristic verified by the standard ARINC429 board card test board.

Through adopting the utility model discloses an above-mentioned technical scheme has obtained following profitable effect:

the utility model discloses use general devices such as comparators to set up modulation circuit and realize ARINC429 level signal to the conversion of TTL signal, general device is ripe device commonly used. And the realization of the method is that,

1) the receiving and transmitting of multiple channels are convenient to realize, only the signal modulation circuit needs to be instantiated for the number of the applied channels, the occupied board distribution area of the circuit is small, and resources are saved;

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be viewed as the protection scope of the present invention.

Claims

1. An ARINC429 bus demodulation circuit realized based on a general device is characterized by comprising a voltage division circuit and a two-way comparator; the voltage division circuit is used for carrying out voltage division processing on two paths of high input signals of ARINC429 and low input signals of ARINC429, respectively connecting the high voltage division end and the low voltage division end of the two paths of input signals into the negative input end and the positive input end of the two-way comparator, and carrying out level comparison and outputting level signals through the two-way comparator.

2. The ARINC429 bus demodulation circuit realized based on general-purpose devices as claimed in claim 1, wherein the voltage dividing circuits are divided into two groups, the first group is formed by connecting resistors R1, R3, R5 and R7 in series, and the second group is formed by connecting resistors R2, R4, R6 and R8 in series; the two-way comparator comprises a first comparator and a second comparator, wherein a pin 2 of the first comparator is connected with the middle ends of the resistor R2 and the resistor R4, one end of a pin 3 is connected with the middle ends of the resistor R5 and the resistor R7, and is connected with a pin 1 through a resistor R9; the pin 6 of the second comparator is connected with the middle ends of the resistor R1 and the resistor R3, and the pin 5 is connected with the middle ends of the resistor R6 and the resistor R8 and is connected with the pin 7 through the resistor R10; the first comparator and the second comparator are respectively externally connected with a working power supply.

3. The ARINC429 bus demodulation circuit based on general-purpose device implementation as claimed in claim 2 wherein, the first comparator and the second comparator are the same chip, only the first comparator is externally connected with an operation power supply.