Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Conversor CC-CC, Conversor SEPIC, Modo de Condução Descontínuo, Redução dos Esforços

Resumo
Este trabalho propõem uma topologia baseada no conversor CC-CC SEPIC convencional isolado. A topologia proposta reduz os esforços de tensão sobre os interruptores e diodos e promove a divisão de corrente nos diodos do estágio de saída quando comparada com o conversor SEPIC convencional. Estas características ampliam a faixa de tensão e potência dos conversores da família SEPIC. O artigo apresenta a topologia, etapas de operação, análise teórica no modo de condução descontínuo (MCD), metodologia de projeto, resultados experimentais com um circuito de grampeamento passivo dissipativo e análise comparativa com o conversor SEPIC convencional. O conversor CC-CC proposto foi validado em um protótipo de 500 W de potência de saída, 400 V de tensão de entrada, 120 V de tensão de saída e 50 kHz de frequência de comutação. O conversor atingiu 91,87% de rendimento em potência nominal.

Title: ISOLATED DC-DC SEPIC CONVERTER WITH REDUCED VOLTAGE STRESS ON SEMICONDUCTORS

Keywords: DC-DC converter, Discontinuous Conduction Mode, Reduced stress, Sepic Converter

Abstract
This work proposes a topology based on the conventional isolated dc-dc SEPIC converter. The proposed topology reduces the voltage stress on the switches and diodes and promotes the current division in the output diodes when compared to the conventional SEPIC converter. These characteristics extend the voltage and power range of SEPIC family converters. The article presents the topology, operation stages, theoretical analysis in the discontinuous conduction mode (DCM), design methodology, experimental results with a passive dissipative snubber cell and comparative analysis with the conventional SEPIC converter. The proposed dc-dc converter was validated in a prototype of 500 W of output power, 400 V of input voltage, 120 V of output voltage and 50 kHz of switching frequency. The converter achieved 91.87% of efficiency in rated power.

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