基于光电耦合器的智能仪器I／O接口电路设计

摘要

In the automatic measurement and control system , there are usually some switch control from the instrument output to the control loop , and the control loop has some measured signal input into the instrument .Optoelectronic devices , photoelectric coupler to light signal as a medium to achieve cou-pling signal and transfer , input and output fully realize the electrical isolation , signal transmission is uni-directional , strong anti-interference capability , high transmission efficiency , therefore I/O photoelectric insulation interface circuit in the intelligent instrument input /output channel to get widely used .%在自动化测控系统中，通常有一些开关控制量从仪器输出到控制回路中，而控制回路也有一些被测量输入到仪器中来。光电耦合器是以光信号为媒介来实现电信号的耦合与传递的光电子器件，输入端与输出端完全实现了电气隔离，信号传输具有单向性，抗干扰能力强，传输效率高。因此光电隔离式I/O接口电路在智能仪器的输入/输出通道中得到了广泛应用。