Amplificadores de tensão utilizados para injetar formas de ondas sintetizadas em lâmpadas HPS

Abstract

The objectives of this work and present a class D amplifiers and full-bridge class D amplifier used to supply one or more high pressure sodium lamps (HPS). In this work, the lamps are feed a synthesized waveform to avoid acoustic resonance. The waveform injected contains a fundamental frequency around 1kHz and its third harmonic. The injection waveform synthesized prevents acoustic resonance the spread power the lamp in spectrum frequency. The ease of control of Class D amplifiers ensures a waveform without major changes in relation to entry. The control strategy and operation of the amplifiers stages have been shown. Studies were presented the strategies used to avoid acoustic resonance and detailed analysis of the injection waveform synthesized. The results of the simulations and practical results obtained were presented.