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Modeling and Analysis of Class D Audio Amplifiers using Control Theories
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 Title & Authors
Modeling and Analysis of Class D Audio Amplifiers using Control Theories
Ryu, Tae-Ha; Ryu, Ji-Yeol; Doh, Tae-Yong;
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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.
class D digital audio amplifier;variable structure control;ripple;hysteresis;describing function;
 Cited by
近藤 光, '디지털 앰프의 개요,' 디지털 기술, 2003년 8월

정상화, 스위칭 주파수 제어 가능한 새로운 구조의 히스테리시스 직류-직류 변환기 및 제어 IC 설계, 한국과학기술원 박사 논문, 2003

C. Edwards and S. K. Spurgeon, Sliding Mode Control: Theory and Applications, Taylor & Francis, 1998

J.-J. E. Slotine and W. Li, Applied Nonlinear Control, Prentice-Hall, 1991

K. J. Astrom and T. Hagglund, Automatic Tunning of PID Controllers, Instrument Society of America, 1988

(주) DMS Technology, 고성능 Digital Amp Chip Set 개발에 관한 연구, 산업기술개발 사업 과제, 산업자원부, 2003

N.-I. Kim, S.-H. Jung, J.-Y. Ryoo, and G.-H. Cho, 'Ripple feedback filter suitable for analog/digital mixed-mode audio amplifier for improved efficiency and stability,' Power Electronics Specialists Conference, pp. 45-49, 2002 crossref(new window)