Audio amplifier based on a monophasic inverter

Author

Antonio, Ginart D. ; Rosana, Esteller R.

Author_Institution

Univ. Simon Bolivar, Caracas, Venezuela

fYear

1994

fDate

25-28 Sep 1994

Firstpage

113

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 1994. Conference Proceedings. 1994 Canadian Conference on

Conference_Location

Halifax, NS

Print_ISBN

0-7803-2416-1

Type

conf

DOI

10.1109/CCECE.1994.405648

Filename

405648