Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Alto Ganho de Tensão, Capacitor chaveado, Conversor Boost, Conversor CC-CC, Indutor Acoplado

Resumo
Este artigo apresenta uma topologia de conversor CC-CC de alto ganho de tensão baseado no conversor boost com célula ladder de capacitor chaveado e indutor acoplado. A posição do enrolamento do secundário do indutor acoplado permite que eliminar possíveis picos de correntes causados pela célula de capacitor chaveado. Além disso, o conversor possui como características: elevado ganho estático, baixo esforço de tensão nos semicondutores, o que permite utilizar interruptor e diodos com baixas resistências intrínsecas; baixos valores de capacitores, visto que os capacitores da célula ladder de capacitor chaveado podem ser projetados na região de carga total sem que ocorram picos de correntes. No artigo é avaliado teoricamente o princípio de operação do conversor proposto, ganho de tensão, esforço de tensão e corrente, comparação com topologias similares encontrados na literatura, e por fim metodologia de projeto. Para validar essas análises, um protótipo de 200 W, 30 V/400 V foi implementado experimentalmente, alçando um rendimento máximo de 96,4 %.

Title: BOOST CONVERTER WITH SWITCHED CAPACITORS CELL AND COUPLED INDUCTOR

Keywords: Boost Converter, Coupled Inductor, DC-DC converter, High step-up, Switched capacitor

Abstract
This paper presents a new topology of high voltage gain DC-DC converter based on the boost converter with the switched capacitor ladder cell and coupled inductor. The secondary position of the coupled inductor does not allow possible current spikes caused by the switched capacitor cell. In addition, the converter has the following characteristics: high static gain, low voltage stress across the semiconductors, which allows the use of switch and diodes with low intrinsic resistances; low capacitor values, since the capacitors of the switched capacitor ladder cell can be designed in the region of full charge without current spikes occurring. The principle of operation of proposed converter was theoretically evaluated, voltage gain, voltage and current stress, comparison with similar topologies found in the literature, and finally, design methodology. To validate these analyzes, a 200 W, 30 V/400 V prototype was implemented experimentally, raising a peak performance of 96.4%.

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