Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: conexão diferencial, Processamento Parcial de Potência, Rastreamento do Ponto de Máxima Potência

Resumo
Este artigo apresenta o conversor Buck–Boost diferencial simétrico, obtido da conexão diferencial entre dois conversores Buck-Boost. A topologia é caracterizada por apresentar baixa ondulação de tensão, processamento parcial de potência, capacidade de fornecer ganhos de tensão intermediários (1<M<10) e simplicidade de dimensionamento. O artigo apresenta a descrição do conversor proposto, suas principais equações e formas de onda em modo de condução contínua com modulação phase-shift, uma análise matemática que demonstra sua capacidade de realizar o processamento parcial de potência e uma análise comparativa com topologias similares publicadas na literatura. Além disso, resultados experimentais extraídos de um protótipo projetado para operar com frequência de comutação de 40 kHz, tensão de entrada de 105 V, tensão de saída de 400 V e potência nominal de 800 W são apresentados. Por ser destinado ao processamento de energia solar fotovoltaica, o conversor é validado em malha aberta e como rastreador do ponto de máxima potência, cuja eficiência CEC obtida é de 97,8%.

Title: SYMMETRIC DIFFERENTIAL DC-DC BUCK-BOOST CONVERTER

Keywords: differential connection, maximum power point tracking, Partial Power Processing

Abstract
This paper presents the symmetric differential Buck–Boost converter, obtained from the differential connection between two Buck-Boost converters. The topology is characterized by presenting low voltage ripple, partial power processing, ability to provide intermediate voltage gains (1 <M <10) and simplicity of design. The paper presents the description of the proposed converter, its main equations and waveforms in continuous conduction mode with phase-shift modulation, a mathematical analysis that demonstrates its ability to perform partial power processing, and a comparative analysis with similar published topologies in literature. In addition, experimental results extracted from a prototype designed to operate with a switching frequency of 40 kHz, input voltage of 105 V, output voltage of 400 V and rated power of 800 W are presented. Since the proposed converter is applied to photovoltaic energy processing, it is validated in open loop and as maximum power point tracker, in which the weighted efficiency CEC obtained is 97.8%.

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