Class D audio amplifier with 4th order output filter and self-oscillating full-state hysteresis based feedback driving capacitive transducers

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A practical solution is presented for the design of a non-isolated high voltage DC/AC power converter. The converter is intended to be used as a class D audio amplifier for a Dielectric Electro Active Polymer (DEAP) transducer. A simple and effective hysteretic control scheme for the converter (buck with fourth- order output filter) is developed and analyzed. The proposed design is verified experimentally by a 125 VAR prototype amplifier, capable of delivering a peak output voltage of 240 V within the frequency range of 100 Hz – 3.5 kHz. A peak efficiency of 87 % is reported.
Original languageEnglish
Title of host publicationProceedings of EPE’14-ECCE
Number of pages7
Publication date2014
Publication statusPublished - 2014
Event16th Conference on Power Electronics and Applications - Lappeenranta University of Technology, Lappeenranta, Finland
Duration: 26 Aug 201428 Aug 2014


Conference16th Conference on Power Electronics and Applications
LocationLappeenranta University of Technology


  • Sliding mode control
  • High voltage power converters
  • Drive
  • Active damping
  • Amplifiers

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