Hysteretic self-oscillating bandpass current mode control for Class D audio amplifiers driving capacitive transducers

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Abstract

A hysteretic self-oscillating bandpass current mode control (BPCM) scheme for Class D audio amplifiers driving capacitive transducers are presented. The scheme provides excellent stability margins and low distortion over a wide range of operating conditions. Small-signal behavior of the amplifier is analysis through transfer function based linear control methodology. Measurements are performed on a single-ended ± 300 V half-bridge amplifier driving a capacitive load of 100 nF. Total Harmonic Distortion plus noise (THD+N) below 0.1 % are reported. Transducers representing a capacitive load and obeying the rules of electrostatics have been known as very interesting alternatives to the traditional inefficient electrodynamic transducers. When driving capacitive transducers from a Class D audio
amplifier the high impedance nature of the load represents a key challenge. The BPCM control scheme ensures a flat frequency response (within 3 db) over the midrange region of 200 Hz – 3.5 kHz.
Original languageEnglish
Title of host publicationProceedings of the 2013 IEEE ECCE Asia Downunder
PublisherIEEE
Publication date2013
Pages971-975
ISBN (Print)978-1-4799-0482-2
DOIs
Publication statusPublished - 2013
EventECCE Asia DownUnder 2013 : 5th Annual International Energy Conversion Congress and Exhibition - Crown Convention Centre, Melbourne, Australia
Duration: 3 Jun 20136 Jun 2013

Conference

ConferenceECCE Asia DownUnder 2013
LocationCrown Convention Centre
CountryAustralia
CityMelbourne
Period03/06/201306/06/2013

Keywords

  • Capacitance
  • Gain measurement
  • Switches
  • Voltage measurement

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