面向多路4~20 mA信号远程传输的输出电路设计方法

The Output Circuit Design Method for Remote Transmission of Multi-Channel 4 - 20 mA Signal

摘要: 本文提出了一种面向多路信号远程传输的4~20 mA输出电路设计方法，该电路与目前广泛应用的同功能电路不同，可实现多路4~20 mA信号在远端共地，不仅解决了远端计算机共地采样问题，而且节省了大量布线。通过仿真分析和电路实验测试，证明所提出的电路硬件设计方法具有布线简单、精度高等优点，能够满足多路4~20 mA信号的远程传输需求。

Abstract: This paper introduces a novel design of 4 - 20 mA output circuit about remote transmission of multiple signals, it is a different circuit with the widely used at present, the circuit can realize the multi-channel 4 - 20 mA signal common ground in the distal. This new method not only can solve the problem of sampling of distal of the same computer, but also can save a large amount of wiring. Analyzed by computer simulation and circuit experiment, we prove that the proposed circuit hardware design method has the advantages of high precision and simple wiring, and it is able to meet the application in multi-channel 4 - 20 mA signal remote transmission.