Abstract

In this paper a SEPIC converter, operating as an AC-DC adaptation stage, is studied. It is shown that the system has high efficiency and good power factor being able to work both as a boost (step-up) or buck (step-down) converter. To impose a loss free resistor (LFR) behavior, sliding-mode control is applied. It is shown that the LFR acts as an ideal rectifier with a power factor near the unity. The output of the system is used to power supply a group of HBLEDs, and its brightness (luminosity) is controlled by the output current. The design and the models are validated by mathematical, numerical and experimental results.

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