Projeto e desenvolvimento de conversores buck operando em ccm e dcm para análise da relação de transferência da ondulação de baixa frequência em leds de potência

Abstract

This work presents the design and implementation of two Buck converters operating in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) for the activation of 20 power LEDs associated in series. The present work introduces the analyses of the LEDs’s drivers whereas the ripple transmission from bus voltage to LEDs current, getting precisely as a result, the LFRTR (low-frequency ripple transfer ratio). Hereby this project, aim put into practice the knowledge got in classroom, through mathematical calculations and simulations that are fundamental to the analysis of the results. The LED was chosen mainly for the lots of applications that it can be used, and because of the advantages the LEDs have above ertain lamps that will be approached throughout this work.