使用光电耦合器进行断信号检测的电路

Using Optocoupler to Detect Open Circuit Failure

介绍一种将光电耦合器中的发光二极管串接在 4～ 2 0mA信号回路中 ,通过光将信号电流的通断情况传输到输出侧的电路。该电路结构简单 ,对信号回路影响小 ,还可允许较大范围的零点信号偏移。

A circuit that connects the LED of a optocoupler to 4～20mA signal loop, and transfers the variation of current signal to the output side by light is introduced in this paper. The cirucit is simple, with less influence on the signal loop, and permiting a wider range zero adjustment.