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, Y.-W.

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

会议论文集：Proceedings of the 2012 24th Chinese Control and Decision Conference, CCDC 2012

会议日期：May 23, 2012 - May 25, 2012

会议地点：Taiyuan, China

语种：英文

外文关键词：Control theory - Digital to analog conversion - Low pass filters - Pulse width modulation - Timing circuits - Voltage control

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. ? 2012 IEEE.