Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Alto Ganho de Tensão, Conversores CC-CC, Indutor Acoplado

Resumo
As estruturas de um indutor acoplado com dois e três enrolamentos têm ganhado popularidade nas aplicações de conversores de alto ganho de tensão. Essas células permitem gerar uma infinidade de topologias de conversores. Porém, até o momento, não há uma discussão comparativa entre ambos os modelos. Assim, esse artigo apresenta uma avaliação de conversores CC-CC de alto ganho de tensão baseados na estrutura empilhada da topologia boost com indutor acoplado com dois e três enrolamentos. Para demonstrar as vantagens, desvantagens e limitação de cada técnica, inicialmente, se analisa o princípio de operação dos conversores Boost-Flyback empilhados, com dois e três enrolamentos de indutor acoplado e células multiplicadoras de tensão no conversor com três enrolamentos. Para isso, se considera a mesma relação de transformação do indutor acoplado, N = 3 e diferentes valores de razão cíclica (D) com o mesmo ganho de tensão (M). Posteriormente, verificam-se os ganhos estáticos dos conversores, seus respectivos esforços de tensão (Total Voltage Stress) e corrente (Total Current Stress). Além disso, uma comparação das topologias semelhantes também são apresentadas. A fim de validar as análises teóricas, três protótipos foram construídos em laboratório. Das topologias avaliadas, o melhor resultado de rendimento foi 95%. Por fim, a distribuição das perdas dos componentes foi elaborada com o intuito de demonstrar os benefícios de cada técnica.

Title: EVALUATION OF STACKED BOOST-FLYBACK CONVERTERS WITH TWO AND THREE WINDINGS AND VOLTAGE MULTIPLIER

Keywords: Coupled Inductor, DC-DC converter, High step-up

Abstract
The coupled inductor structures with two and three windings have gained popularity in applications of high voltage gain converters. These cells allow to generate an infinity of topologies of converters. However, to date, there is no discussion comparison between both models. Thus, this article presents an evaluation of high voltage gain dc-dc converters based on the simple structure of the boost topology with coupled inductor with two and three windings. To demonstrate the advantages, disadvantages, and limitations of each technique, initially, is analyzed the principle of operation of stacked Boost-Flyback converters, with two and three windings coupled inductor and voltage multiplier cells in converter with three windings. For that, it is considered the same turnsratio of the coupled inductor N = 3 and different value of duty cycle (D) with the same voltage gain (M). The analyzes performed is based on the demonstration of the static gains of the converters, their respective voltage (Total Voltage Stress) and current stresses (Total Current Stress). In addition, a comparison of topologies is also displayed. To validate theoretical analyses, three prototypes were constructed in the laboratory. Of the topologies evaluated, the best result income was 95%. Finally, the distribution of component losses was prepared in order to demonstrate the benefits of each technique.

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