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Josué L. da Silva
Departamento de Eletroeletrônica, Centro Federal de Educação Tecnológica de Minas Gerais - CEFET, MG
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Pedro Henrique C. Lopes
Programa de Pós-graduação em Engenharia Elétrica, Universidade Federal de Juiz de Fora, MG
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Pedro S. Almeida
Programa de Pós-graduação em Engenharia Elétrica, Universidade Federal de Juiz de Fora, MG
Keywords:
SEPIC, LED, EMI, Coupled Inductors, Ripple Steering, Uncertainty, Monte Carlo Simulation
Abstract
One of the ways to mitigate the EMI (Electromagnetic Interference) conducted in the LED drivers is through the choice of the CC-CC converter that has a low ripple in the input current, as seen in the case of the SEPIC converter with coupled inductors. Regarding the later converter, it is possible through the adjustment of the inductor’s parameters, to reduce the input current ripple theoretically to zero by a technique called ripple steering. However, in a practical experiment, this is difficult to achieve because there are uncertainties in the inductor’s parameters, which prevent the achievement of a converter with a null ripple with acceptable repeatability. The goal of this work is to decrease the input current harmonic content in the way that the component’s uncertainties don’t produce great ripple variabilities. The Monte Carlo simulation was used to make the uncertainty propagation. A case study with a 50 W lamp driven by a 127 V (rms) was done, in which a confidence level of 95% was obtained with a ripple of (30 ± 7, 5)%.
