Title :
Analysis of the class AD audio amplifier including hysteresis effects
Author :
Ginart, A. ; Leach, W.M., Jr. ; Bass, R.M. ; Habetler, T. ; Gray, Kim
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
fDate :
6/22/1905 12:00:00 AM
Abstract :
Combinations of analog and switching techniques have led to the development of audio power amplifiers capable of producing low distortion with high efficiency. The high efficiency is achieved with a combination of an inverter and an analog amplifier, where the former provides the power and the latter acts as an active filter to correct distortion. In this paper, a full analysis of the system is presented using the hysteresis describing function approach to model the inverter. The set of equations obtained allows the description of the nonlinear behavior of the system, such as the limit cycle of the output voltage and its dependency on the hysteresis. The theoretical development also provides the relation between the switching frequency and the system parameters. The derived equations are verified and compared using PSpice simulations
Keywords :
DC-AC power convertors; SPICE; audio-frequency amplifiers; circuit analysis computing; describing functions; invertors; power amplifiers; switching circuits; PSpice simulations; active filter; analog amplifier; class AD audio power amplifier; efficiency; harmonic distortion correction; hysteresis describing function approach; hysteresis effects; inverter modelling; nonlinear behavior; output voltage limit cycle; switching frequency; Active filters; High power amplifiers; Hysteresis; Inverters; Limit-cycles; Nonlinear distortion; Nonlinear equations; Power system modeling; Switching frequency; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2000. APEC 2000. Fifteenth Annual IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-5864-3
DOI :
10.1109/APEC.2000.822824
