Análise e Projeto da Topologia Integrada Sepic Meia Ponte com Controle de Fluxo Luminoso para o Acionamento de Lâmpadas Fluorescentes sem Eletrodos
DOI:
https://doi.org/10.18618/REP.2012.4.717729Keywords:
fator de potência, Lâmpada Fluorescente Sem Eletrodos, Técnica de IntegraçãoAbstract
Este artigo apresenta um reator eletrônico para lâmpadas fluorescentes sem eletrodos (LFSE), no qual se elucidam as questões de projeto e desenvolvimento. O reator é destinado à alimentação de uma LFSE de 100 W em 250 kHz, com a possibilidade de controle da intensidade luminosa. A topologia proposta compõe-se por um conversor SEPIC (Single-Ended Primary Inductance Converter), empregado como estágio pré-regulador de fator de potência (PFP), integrado a um inversor meia ponte (Half-Bridge) ressonante, utilizado como estágio de controle de potência (CP). A integração entre os dois estágios, acima descritos, é proposta neste trabalho, com o principal intuito de reduzir o número de interruptores ativos, aumentando, assim, a confiabilidade do reator eletrônico proposto. Resultados experimentais ratificam a viabilidade da solução proposta, a qual atingiu-se uma faixa de controle de potência de aproximadamente 54% (100 W até 46 W). A topologia implementada possui elevado fator de potência (0,989) associado a uma baixa distorção harmônica de corrente (THD) (14,929%), sem o emprego de filtros de entrada adicionais para supressão da interferência eletromagnética (IEM). O rendimento experimental da topologia é de 87%, na potência nominal da lâmpada.
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