文献类型：会议论文

英文题名：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

通信作者：Wang, YW[1]

机构：[1]Chinese Acad Forestry, Inst Wood Ind, Beijing 100091, Peoples R China

会议论文集：24th Chinese Control and Decision Conference (CCDC)

会议日期：MAY 23-25, 2012

会议地点：Taiyuan, PEOPLES R CHINA

语种：英文

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

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.