Title :
Class D audio amplifier with 4th order output filter and self-oscillating full-state hysteresis based feedback driving capacitive transducers
Author :
Nielsen, David ; Knott, Arnold ; Andersen, Michael A. E.
Author_Institution :
Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
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.
Keywords :
DC-AC power convertors; audio-frequency amplifiers; capacitive sensors; electroactive polymer actuators; radiofrequency filters; 4th order output filter; DEAP transducer; capacitive transducers; class D audio amplifier; dielectric electroactive polymer transducer; frequency 100 Hz to 3.5 kHz; hysteretic control; nonisolated high voltage DC-AC power converter; self-oscillating full-state hysteresis based feedback; Capacitors; Equations; Integrated circuits; Power generation; Resistance; Switching frequency; Transducers; Active damping; Amplifiers; Drive; High voltage power converters; Sliding mode control;
Conference_Titel :
Power Electronics and Applications (EPE'14-ECCE Europe), 2014 16th European Conference on
Conference_Location :
Lappeenranta
DOI :
10.1109/EPE.2014.6910924
