Análise de transferência de ondulação de baixa frequência para os conversores SEPIC e ZETA para drivers de led

Abstract

This paper presents the design, simulation and development of two topologies for converters with the objective of developing a mathematical analysis describing the behavior of the low frequency ripple transfer between the voltage variation in the bus for the current variation in the LEDs. The topologies selected for study are the SEPIC (Single Ended Primary Inductance Converter) converter and the ZETA converter, both operating in discontinuous mode (DCM), since both have not been explored in this respect at the present time. The analysis between the converters is designed to be used in integration between the PFC (Power Factor Control) + PC (Power Control) focusing on the PC stage, with a single control loop responsible for controlling the output current in order to reduce the required bus capacitance and consequently compatibility with the recommendations of IEEE Std 1789-2015 to mitigate the effects of flicker. Since the maximum allowable ripple to avoid any biological hazards any biological hazards is 19.2%, the SEPIC allows bus voltage ripple values of up to 10,5%, while the ZETA converter allows values of up to 9,6% for the selected LED (Light Emitting Diode) tubular lamp.