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Modeling and Analysis of Class D Audio Amplifiers using Control Theories

제어이론을 이용한 D급 디지털 오디오 증폭기의 모델링과 해석

  • 류태하 ((주)디엠비테크놀로지) ;
  • 류지열 ((주)디엠비테크놀로지) ;
  • 도태용 (국립한밭대학교 제어계측공학과)
  • Published : 2007.04.01

Abstract

A class D digital audio amplifier with small size, low cost, and high quality is positively necessary in the multimedia era. Since the digital audio amplifier is based on the PWM signal processing, it is improper to analyze the principle of signal generation using linear system theories. In this paper, a class D digital audio amplifier based ADSM (Advanced Delta-Sigma Modulation) is considered. We first model the digital audio amplifier and then explain the operation principle using variable structure control algorithm. Moreover, the ripple signal generated by the hysteresis in the comparator has a significant effect on the system performance. Thus, we present a method to find the magnitude and the frequency of the ripple signal using describing function. Finally, simulations and experiments are provided to show the validity of the proposed methods.

Keywords

References

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