Minimização de Capacitância em Luminárias à Led Baseada na Conexão Otimizada de Conversores Estáticos
DOI:
https://doi.org/10.18618/REP.2013.2.10011009Keywords:
Conversores CA-CC, Eficiência Energética, Fonte de Potência Chaveada, Lâmpadas LEDAbstract
Este artigo apresenta uma estrutura de conversor estático, utilizando processamento parcial de energia, para minimizar capacitâncias em luminárias à base de LEDs aplicadas na iluminação pública, onde potências maiores que 70 W geralmente são requisitadas. A estrutura da topologia é baseada em dois conversores, conectados de maneira que o segundo conversor processe apenas uma pequena parcela da potência total enviada à carga. Além disso, com o intuito de diminuir a capacitância do primeiro estágio, uma estratégia de controle é utilizada com o objetivo de compensar ativamente essa ondulação. Os conversores utilizados, a modelagem matemática e a estrutura do controle são mostrados em detalhes. Um protótipo foi montado, com 75 W de potência para 220 Vrms de tensão de entrada, a fim de demonstrar a funcionalidade da ideia e suas principais características.
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