文献类型：会议论文

中文题名：Analysis of Double-T Filter Used for PWM Circuit to D/A Converter

作者：WANG Yan-wei[1] CHENG Fang[1] ZHOU Yu-cheng[1] XU Jia-he[1]

第一作者：WANG Yan-wei

机构：[1]Institute of Wood Industry, Chinese Academy of Forestry ,Beijing 100091;

会议论文集：The 24th Chinese Control and Decision Conference (第24届中国控制与决策学术年会 2012 CCDC)论文集

会议日期：20120523

会议地点：太原

主办单位：中国航空学会;中国自动化学会;中国人工智能学会;中国系统仿真学会

语种：英文

中文关键词：PWM signal..Double-T filter..Digital to Analog converter..Simulation analysis

分类号：TN7

年份：2012

摘要：In practice applications, high-precision analog output is often required for complex process control, so the PWM (Pulse Width Modulation) output should be converted to smooth direct current output. A simple, practical and high-precision conversion and analysis method is presented in this paper. After transforming the PWM waveform with Fourier Transform Method, the digital-analog converter signal, which is demodulated through PWM, can be modulated with the low-pass filter. Thus the conversion from PWM to DAC (Digital to Analog Converter) can be realized. For the typical double-T filter circuit, based on the concept of closed-loop dominant pole in classical control theory, the order of the transfer function expression is reduced. The mathematical analysis to direct current component of PWM signal obtained through Double-T filter circuit is verified by simulation. Finally, the conversion rapidity and accuracy of this method for DAC is discussed.