Title :
Audio amplifier based on a monophasic inverter
Author :
Antonio, Ginart D. ; Rosana, Esteller R.
Author_Institution :
Univ. Simon Bolivar, Caracas, Venezuela
Abstract :
An audio amplifier was simulated, designed, built and tested, based on a switching technique, by means of a monophasic inverter. Variable width pulses control the monophasic inverter switching. The duration of each pulse was established by comparing the input (reference signal) and a sample of the amplified output signal, the difference between both produces the error signal that determines in real time the pulse width. A lowpass filter was connected to the inverter output the principal function of which was to eliminate the high frequencies due to the inverter chopping. This amplifier can work with any signal shape inside its bandwidth and also corrects the nonlinearities from the system. Distortions lower than 1% can be obtained with this kind of amplifier. This technique leads to two main advantages: high power amplifiers with high efficiency; and (2) a considerable reduction in the amplifier size
Keywords :
PWM invertors; audio-frequency amplifiers; choppers (circuits); low-pass filters; PWM; amplifier size reduction; audio amplifier; error signal; high efficiency; high frequencies elimination; inverter chopping; lowpass filter; monophasic inverter; switching technique; variable width pulses control; Audio amplifiers; Choppers; Low pass filters; Pulse width modulated inverters;
Conference_Titel :
Electrical and Computer Engineering, 1994. Conference Proceedings. 1994 Canadian Conference on
Conference_Location :
Halifax, NS
Print_ISBN :
0-7803-2416-1
DOI :
10.1109/CCECE.1994.405648
