Current source output circuit

Abstract

The invention relates to a current source output circuit which includes an isolation circuit [1], a voltage dividing circuit [2], a current source circuit [3], a digital-to-analog conversion circuit [4], a controller [5], an output monitoring circuit [6] and an output shutdown circuit [7]. When the current source output circuit is working, the controller [5] controls the current source circuit [3]to output current through the digital-to-analog conversion circuit [4], in the process of outputting the current, the controller [5] monitors the working state of an output circuit in real time through the output monitoring circuit [6], when the controller [5] detects a circuit output abnormality, the output circuit is shut off through the output shutdown circuit [7], and the affection of the working state of equipment on a machine by the output abnormality is avoided.

Description

technical field

[0001] The invention belongs to the category of electronic technology, is applied in the technical field of avionics, and is a current source output circuit. Background technique

[0002] The current source output circuit is a commonly used circuit in the airborne. It is mostly used to drive the sensors on the machine to make it work normally. The output current ranges from 4 to 20mA. It is divided into constant current source and adjustable current in use. source.

[0003] Such as the pipeline booster pump and voltage regulation control box on the commonly used current source drive machine on the tanker, so the current source circuit can play a vital role in the onboard work. If the current source output is abnormal, it will cause the onboard The operation of the equipment is out of control, and the conventional current source output circuit only provides current output and cannot monitor the output state. Contents of the invention

[0004] Purpose of th...

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