Light flicker of fluorescent lamps with different types of ballasts caused by interharmonics
ABSTRACT The paper presents an analysis of the voltage fluctuations caused by interharmonics and its influence on luminous flux fluctuations of used combinations of fluorescent lamps and ballasts. One of the analysis results is a concept determining light sources sensitivity to such disturbing type based on frequency components utilization. Further a complex measured data file of sensitivity curves in various combinations of fluorescent lamps and ballasts are pointed. Measured and compared combinations include various types of fluorescent lamps, various wattages, modes of operation of the ballast and its specific designs and dimensioning of circuit elements etc.
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Conference Proceeding: A critical-conduction-mode single-stage power-factor-correction electronic ballast[show abstract] [hide abstract]
ABSTRACT: A critical-conduction-mode single-stage power-factor-correction (PFC) electronic ballast is presented in this paper. The proposed ballast combines the power-factor-correction stage with a conventional half bridge DC/AC inverter into a single-stage to reduce the cost. The power factor correction stage is a boost-like converter operating in critical conduction mode so that a high power factor is achieved naturally. By exploiting voltage divider, the ratio of line peak voltage to DC-bus voltage can be chosen as a large value of near one, yet a good power factor can be achieved. Theoretical analysis and experimental results for two 45-watt fluorescent lamps are presentedApplied Power Electronics Conference and Exposition, 2000. APEC 2000. Fifteenth Annual IEEE; 02/2000