Analysis of Double-T Filter Used for PWM Circuit to D/A Converter
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.
PWM signal..Double-T filter..Digital to Analog converter..Simulation analysis
WANG Yan-wei CHENG Fang ZHOU Yu-cheng XU Jia-he
Institute of Wood Industry, Chinese Academy of Forestry ,Beijing 100091
国际会议
The 24th Chinese Control and Decision Conference (第24届中国控制与决策学术年会 2012 CCDC)
太原
英文
2764-2768
2012-05-23（万方平台首次上网日期，不代表论文的发表时间）