Frequency dependent loss analysis and minimization of system losses in switchmode audio power amplifiers

Akira Yamauchi, Arnold Knott, Ivan Harald Holger Jørgensen, Michael A. E. Andersen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    In this paper, frequency dependent losses in switch-mode audio power amplifiers are analyzed and a loss model is improved by taking the voltage dependence of the parasitic capacitance of MOSFETs into account. The estimated power losses are compared to the measurement and great accuracy is achieved. By choosing the optimal switching frequency based on the proposed analysis, the experimental results show that system power losses of the reference design are minimized and an efficiency improvement of 8 % in maximum is achieved without compromising audio performances.
    Original languageEnglish
    Title of host publicationProceedings of the 137th AES Convention
    Number of pages9
    PublisherAudio Engineering Society
    Publication date2014
    Publication statusPublished - 2014
    EventAES 137th Convention - Los Angeles, CA, United States
    Duration: 9 Oct 201412 Oct 2014

    Conference

    ConferenceAES 137th Convention
    Country/TerritoryUnited States
    CityLos Angeles, CA
    Period09/10/201412/10/2014

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