Self-detection circuit for discrete quantity output interface

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...

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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

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