电流环探测感知传输设计探讨  

Current loop detection of sensing transmission design

作　　者：怯肇乾 纪东升 Kai Zhaoqian;Ji Dongsheng(HNCC Electronic Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]河南驰诚电气

出　　处：《电子测量技术》2018年第20期18-22,共5页Electronic Measurement Technology

摘　　要：应用广泛的4-20 mA电流环（CL）现场模拟通信传输,常常存在各类众多问题,甚至有对系统造成严重不良影响,设计实现可靠、高效、持久工作的电流环电路是一个持续不断的探索研究内容。针对常规应用,立足已有电路形式,以低成本的分立元器件,重新规划设计的＂非隔离三线PWM-CL电路＂、＂二线PWM隔离控制环路＂和＂二线DAC隔离控制环路＂,经过模拟仿真分析和测试实验分析实现了PWM控制环路与DAC控制环路的最优调整,传统电路得以简化重生和完善优化,进一步降低了不经意反接、突发器件损坏、发而无收等电流环通信电路的异常现象发生。Field analogcommunication transmission about 4～20 mA current loopexist various problems. It affects system performance in serious time.The design and implementation of reliable, efficient and persistent current loop circuit is a continuous research topic. Non isolated three line PWM-CL circuit, two-PWM-isolation-control-circuit and two-PWM-isolation-control-circuit with discrete componentis reanalyzed and redesigned. It achieves optimal adjustment of PWM-control-circuit and DAC-control-circuit through the simulation analysis and test analysis. It makes the traditional-circuit can be simplified and improved the optimizationof rebirth. It further reduces the abnormal phenomena of the communication circuit of current loop.

关 键 词：电流环 传输线制 脉宽调制 数模转换 压流变换 低通滤波 

分 类 号：TN919.71[电子电信—通信与信息系统]