Maicol F. de Melo

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The knowledge of the interrelationships among the photometrical, electrical and thermal (photoelectrothermal) parameters is extremely important to design lighting systems based on light-emitting diodes (LEDs). This paper proposes a novel methodology based on the luminous flux estimation of LEDs considering a photoelectrothermal design space. The main(More)
This paper presents a high-power-factor LED driver implemented by using an input current shaper. A DCM-operated flyback converter is placed between the main rectifier and DC bus, in order to increase the conduction angle of the rectifier diodes and to obtain low current harmonics injected to the mains. Power control stage is performed by a buck converter,(More)
Most common Power Factor Correction (PFC) solutions for low power applications, when galvanic isolation is required, involve the use of discontinuous conduction mode (DCM) dc to dc topologies. The control is generally based on fixed duty ratio operation, or at best, on a classic low-bandwidth duty-ratio control. Considering public lighting systems, in which(More)
This paper presents the analysis and design of an LED driver based on the series-resonant converter (SRC) and on the self-oscillating command circuit (SOCC). The use of SRC provides a reduction of the low frequency (LF) ripple in the LEDs' current, originated by the voltage ripple in the output of the power factor correction (PFC) stage (bus voltage(More)
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