Projeto de um conversor Flyback auto-oscilante de baixo custo para LEDs de potência

Abstract

The LEDs (Light Emitting Diode) are devices in growing up in the lighting market, since 2007 these devices have already condition to replace incandescent bulbs and in 2012 is expected to replace fluorescent lamps. Main characteristic of these devices stand out due to life cycle very long and high efficiency. Being on this information this dissertation will present the study, simulation and experimental results of the self-oscillating Flyback converter to supply power LEDs. Two more simulation are also conducted to Flyback converters, one with the traditional PWM Flyback converter and another one with PFC Flyback converter. The PWM Flyback converter is study just to obtain compare with the self-oscillating Flyback converter, confirming that both converters are equivalent to regulate the current on the LEDs. There were realized just simulations for the PFC Flyback converter and this will be showing at Appendix C. The study of this converter is justified by the high power factor and low THD, but this converter has a high ripple on the output current, the ripples pike is responsible to reduce the value of the average current on LEDs