Switching value output self-protection circuit

Abstract

The invention relates to the technical field of industrial control, in particular to a switching value output self-protection circuit. The switching value output self-protection circuit achieves the technical purpose that a system is maintained conveniently. The circuit comprises an output relay, a Hall current sensor, an and gate and an output drive module for driving the output relay to be switched on and switched off. The drive signal output end of the output drive module is connected to the control end of the output replay. The primary side output end of the Hall current sensor is connected to a static contact of the output relay. One input end of the and gate is connected to a secondary-side voltage output end of the Hall current sensor, the other input end is connected to a switching value signal source, and the output end of the and gate is connected to the source signal input end of the output drive module. The circuit is especially suitable for the switching value output module of a digital control platform based on an FPGA technology.

Description

technical field [0001] The invention relates to industrial control technology, in particular to a technology of switching value output self-protection circuit. Background technique [0002] Modern industrial industries (such as chemical control, nuclear power industry, etc.), require the entire process of control (input, controller, output) to have high reliability and availability. However, the harshness of the industrial environment causes short-circuit events of equipment and cables to occur from time to time. In order to prevent damage to related equipment after a short circuit event occurs, a fuse is generally equipped in the circuit to prevent excessive current. However, the configuration of the fuse needs to be considered comprehensively in the system. At the same time, the fuse is basically used for one time. If it is broken, it needs to be replaced. It is inevitable to touch other parts of the system during the replacement process, which increases the probability o...

AI Technical Summary

Problems solved by technology

However, the configuration of the fuse needs to be considered comprehensively in the system. At the same time, the fuse is basically used for one time. If it is broken, it needs to be replaced. It is inevitable to touch other parts of the system during the replacement process, which increases the probability of system failure and makes system maintenance very inconvenient.

Images