Self-detection circuit for discrete quantity output interface

An output interface and discrete quantity technology, applied in the field of avionics, can solve the problems of cumbersome control, failure to respond in time to faults, and long self-test circuit loops, etc., and achieve the effect of simple control, fewer components, and less failure

Active Publication Date: 2019-04-02
SHAANXI QIANSHAN AVIONICS
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a self-testing circuit for a discrete output interface, which is suitable for the self-testing of the discrete output interface in the electromechanical system in the aviation field, so as to solve the problem that the loop in the traditional self-testing circuit is too long and the control is cumbersome. Timely response to technical issues

Method used

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  • Self-detection circuit for discrete quantity output interface

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0023] like figure 1 Shown is the principle block diagram of the present invention, and concrete structure is as follows: comprise discrete quantity output channel unit, detection point voltage acquisition unit, optocoupler switch control unit, test voltage injection unit; Described discrete quantity output channel unit comprises sequentially by circuit Connected optocoupler A switch, optocoupler B switch, and isolation diode; the front end of the discrete output channel unit is connected to the input voltage, and the rear end is connected to the output voltage; the detection point voltage acquisition unit includes a first signal conditioning module, A / D conversion module; the two ends of the optocoupler B switch are respectively connected to the A / D conversion module through the first signal conditioning module; the optocoupler switch control unit is an opt...

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Abstract

The invention belongs to the avionics technology, and particularly relates to a self-detection circuit for a discrete quantity output interface. The circuit comprises a discrete quantity output channel unit, a detection point voltage acquisition unit, an optical coupling switch control unit, and a test voltage injection unit. The working states of channels are self-detected by configuring auxiliary optical coupling switches in a main channel. The self-detection circuit for the discrete quantity output interface realizes a self-detection function of rapid discovery and rapid response for the faults of the discrete quantity output interface with the low cost and the high stability.

Description

technical field [0001] The invention belongs to the avionics technology, and in particular relates to a self-detection circuit of a discrete quantity output interface. Background technique [0002] In the field of avionics technology, the discrete output interface is a particularly important interface. For example, the discrete signal (switch signal) output by the discrete output interface can indirectly or directly control the opening and closing of the fuel pump. The fuel pump cannot work normally due to the failure of the volume output interface. If the alarm is not detected in time and corresponding measures are not implemented, serious consequences will definitely result. The traditional discrete output interface self-detection circuit is to detect at the beginning of the control command and the discrete output. The control is cumbersome, too many circuits pass through the middle, the cost is high, and the failure rate of the components in the circuit itself is high, re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/25
CPCG01R19/2503G01R31/00
Inventor 徐闻拯田军王君阳
Owner SHAANXI QIANSHAN AVIONICS
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