Investigation of switching frequency variations and EMI properties in self-oscillating class D amplifiers

Dennis Nielsen, Arnold Knott, Gerhard Pfaffinger, Michael A. E. Andersen

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    Abstract

    Class D audio amplifiers have gained significant influence in sound reproduction due to their high efficiency. One of the most commonly used control methods in these amplifiers is self-oscillation. A parameter of key interest in self-oscillating amplifiers is the switching frequency, which is known for its variation. Knowledge of switching frequency variations is of great importance with respect to electromagnetic interference (EMI). This paper will investigate, whether the switching frequency is depended on modulation index and audio reference frequency. Validation is done using simulations, and the results are compared with measurements performed on a 50 W prototype amplifier. The switching frequency is tracked through accurate spectrum measurements, and very good compliance with simulation results are observed.
    Original languageEnglish
    Title of host publicationProceedings of the 127th AES Convention
    Number of pages10
    PublisherAES
    Publication date2009
    ISBN (Print)978-0-937803-71-4
    Publication statusPublished - 2009
    Event127th AES Convention - New York, NY, United States
    Duration: 9 Oct 200912 Oct 2009
    Conference number: 127
    http://www.aes.org/events/127/

    Conference

    Conference127th AES Convention
    Number127
    Country/TerritoryUnited States
    CityNew York, NY
    Period09/10/200912/10/2009
    Internet address

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