Designing a dimmable electronic ballast with voltage control for fluorescent lamp

Voltage-frequency control dimming method for T5 fluorescent lamps

“…Thus, the design was carried out for |φ|=50° considered as a safe margin. Figures 8,9,and 10 show the comparison of experimental and simulation results. Figure 10 shows |φ| measured and calculated.…”

“…This method is based on the possibility of the FL dimming through the controllable dc bus voltage that feeds the inverter stage [9]. Control Generally, an AC-DC converter is employed for PFC and voltage regulation purpose [7], thus increasing the circuit complexity and component count.…”

Implementation of series resonant inverter to improve efficiency fluorescent lamps

“…The lamp can be approximated to a resistor that changes with light intensity, for example the RMS voltage of lamp increases almost linearly when the power of the lamp decreases, therefore the lamp behaves as a negative resistance, equally the equivalent resistance of the lamp is in function of its power [9] [10] [11]. Figure 2 shows the equivalent resistance of the lamp decreases as the power increases and increases when the power decreases.…”

Metodologia de Projeto para o Filtro Ressonante LCC de Reatores Eletrônicos com Controle de Luminosidade para Lâmpadas Fluorescentes

“…Diversas metodologias de projeto têm sido propostas para este circuito, sendo que as principais análises são concentradas no filtro SPLR, com o objetivo de propiciar uma escolha otimizada de seus parâmetros [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Em termos práticos, a maioria destas metodologias é baseada em análises de impedâncias equivalentes do circuito, utilizando a técnica de aproximação fundamental [3] e assumindo que as lâmpadas fluorescentes comportam-se como resistências variáveis [4][5][6][7][8][9][10][11][12][13][14][15].…”