电子器件2025，Vol.48Issue(1)：211-217,7.DOI:10.3969/j.issn.1005-9490.2025.01.034
一种高精度模拟量输出电路在工业仪表中的应用
Application of A High Precision Analog Output Circuit in Industrial Instruments
摘要
Abstract
PWM(Pulse Width Modulation)signal has the advantages of easy generation and stability.However,in the industrial field,because the current signal has good anti-interference feature,it is generally used to control production by signal transmission using cur-rent analogue.A new design of current analogue output circuit for converting PWM signal to 4 mA-20 mA is presented,which includes photocouple isolation module,integral circuit module,amplifier circuit module and so on.The resulting PWM wave is calculated by the circuit to get the corresponding analogue value,thus achieving the DAC function.The design is verified to achieve the expected function by theoretical calculation design and Multisim simulation.This design uses a newly designed circuit,which only uses analog circuit to realize the function of digital-to-analog conversion,improves the accuracy of DAC,and has the advantages of low cost and simple struc-ture.It has certain application value in industrial instrumentation.关键词
高精度/PWM信号/4mA～20mA电流输出/数模转换/电路设计Key words
high precision/PWM signal/4 mA～20 mA current output/DAC/circuit design分类
电子信息工程引用本文复制引用
李之尧,孙冬梅..一种高精度模拟量输出电路在工业仪表中的应用[J].电子器件,2025,48(1):211-217,7.基金项目
《FAC微小流量自动控制器》研究与开发产学研项目(2021年第2批) （2021年第2批）
