Desarrollo de dos sistemas de amplificación basados en fuentes conmutadas y amplificadores clase D utilizando un enlace inalámbrico para la transmisión de audio.

Abstract

Two amplification systems were designed and implemented based on a switched-mode power supply, D-class amplifiers of high performance and a wireless audio transmitter circuit which, all in all, gives a 700 watts power. It was started with the switched-mode power supply development, generating a PWM signal to control the power changeover switches that send the signal to the pulses transformer that gives a galvanic isolation and it will be able to supply a symmetrical tension and an auxiliary for the pre amplifier circuit power supply. The D-class audio amplifier generates a pulse signal of high frequency for the commutation of the MOSFET (Metal-oxide-semiconductor Field-effect transistors), which are controlled by the integrated IRS2092 which is especially designed for the audio signals, having as main characteristics, the use of few passive external elements necessaries for its operation and protection circuit for over current; finally, the audio transmission stage is done by the emitter/receiver card with Pure Path technology that allows a 2.4GHz communication, with wireless audio link from point to point without signal compression. It was applied a charge of 2 ohm getting as a result a power of 690 watts which means an performance of the 80% and a harmonic distortion of 7.43%. It is concluded that the amplification system improves the performance with minimum losses for heat, reducing size and weigh with an audio connectivity of great fidelity. It is recommended to use forced ventilation with the objective of avoiding heating to long work periods.