Modelo Resistivo Para Lâmpadas Fluorescentes Alimentadas Por Inversor Srpl, Com Controle De Luminosidade Por Variação De Freqüência De Operação
DOI:
https://doi.org/10.18618/REP.2006.3.215224Keywords:
Controle de Luminosidade, Elevada Freqüência de Operação, Modelo de Lâmpada FluorescenteAbstract
Este artigo apresenta uma nova metodologia para a determinação de modelos baseados em resistências equivalentes para lâmpadas fluorescentes de cátodo quente, alimentadas com o clássico inversor Half-Bridge com filtro Série-Ressonante com Carga em Paralelo (SRPL, do inglês, Series-Resonant Parallel-Loaded). A técnica de controle de luminosidade considerada nas análises é baseada na variação da freqüência de operação do inversor. A principal contribuição da metodologia proposta é a inclusão dos filamentos dos eletrodos no modelo, considerando-se os efeitos da variação da freqüência de operação sobre o conjunto lâmpada + filtro SRPL. Informa-se que o modelo proposto não é válido para caracterizar a lâmpada de forma isolada, mas sim o conjunto desta com o filtro SRPL. Resultados experimentais mostrados neste artigo, obtidos com uma lâmpada fluorescente F32T8, indicam que a precisão do modelo é bastante satisfatória.
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