Architecture implementation of class-D amplifiers using digital-controlled multiphase-interleaved PWM technique

Yu Tzung Lin*, Chi Yang Lee, Ying-Yu Tzou

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

The class-D amplifier has the advantages of having a high efficiency, a small-size and gains its wide applications in battery-powered audio systems. However, its output power is limited by the rating of its output transistors. This paper presents the development of a new architecture for the realization of a class-D audio amplifier using a digital-controlled multi-phase interleaved PWM converter to enhance its output power. This interleaved technique is widely used in DC-DC converters. A digital current control technique with interleaved PWM generation was developed to reduce the total harmonic distortion (THD) of the output current under lower PWM switching frequency. A comparative evaluation of a single-phase and a three-phase class-D amplifier structure is presented. Furthermore, the design and implementation of a digital control IC, including an ADC synchronous sampler, a digital compensator, and a phase-shift PWM generator, is introduced. Computer simulations and experimental verifications are given to illustrate the feasibility and performance of the proposed technique.

Original languageEnglish
Title of host publicationConference Proceedings - IPEMC 2006
Subtitle of host publicationCES/IEEE 5th International Power Electronics and Motion Control Conference
Pages1192-1197
Number of pages6
DOIs
StatePublished - 1 Dec 2007
EventIPEMC 2006: CES/IEEE 5th International Power Electronics and Motion Control Conference - Shanghai, China
Duration: 14 Aug 200616 Aug 2006

Publication series

NameConference Proceedings - IPEMC 2006: CES/IEEE 5th International Power Electronics and Motion Control Conference
Volume2

Conference

ConferenceIPEMC 2006: CES/IEEE 5th International Power Electronics and Motion Control Conference
CountryChina
CityShanghai
Period14/08/0616/08/06

Keywords

  • Digital audio IC
  • Digital control
  • Interleaved class-D amplifier

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