Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Condução Descontínua, Correção do fator de potência, Redução da Distorção Harmônica, Retificador Boost Brigeless Modificado, Técnica de Modulação

Resumo

Tradicionalmente, os retificadores do tipo Boost operando no modo de condução descontínua (MCD) não usam controle de corrente e operam com razão cíclica constante, mas apresentam uma distorção harmônica significativa devido à presença de uma componente de 3ª harmônica. O presente artigo equaciona matematicamente o problema e propõe o uso de uma técnica de modulação que corrige a razão cíclica durante o período da rede e, assim, elimina significativamente a distorção harmônica da corrente, sem adicionar sensores de corrente. A técnica de modulação utilizada já foi apresentada na literatura, no entanto, este artigo demonstra um maior detalhamento matemático da estratégia e propõe uma metodologia para determinar o índice de modulação ótimo. Adicionalmente, propõe-se também uma alternativa para tornar a técnica menos susceptível às variações da tensão de entrada. De modo a validar o estudo teórico, construiu-se um protótipo de 500 W do retificador Boost bridgeless modificado, com tensão eficaz de entrada de 220 V, tensão de saída de 450 V e frequência de comutação de 58,6 kHz. Resultados experimentais apresentaram uma melhoria na distorção harmônica total de 22,17% para 4,88% e no fator de potência de 0,977 para 0,996, ambos em carga nominal.

Title: MODULATION TECHNIQUE FOR REDUCING CURRENT THD APPLIED TO BOOST BRIDGELESS RECTIFIER IN DCM

Keywords: Discontinuous Conduction Mode, Harmonic Distortion Reduction, Modified Bridgeless Boost Rectifier, modulation technique, Power Factor Correction

Abstract

Traditionally, Boost type rectifiers operating in discontinuous conduction mode (DCM) do not use current control and work with constant duty cycle. However, they present a higher harmonic distortion due to the presence of a 3rd harmonic component. The paper mathematically discusses this issue and proposes a modulation technique, which corrects the duty cycle during the grid period. Therefore, it significantly eliminates the harmonic distortion of the current without adding current sensors. The approached modulation technique is already known in literature, however, this paper proposes a greater mathematical detail of the strategy and a methodology to obtain the optimum modulation index. In addition, an alternative for the technique is proposed for it to become less susceptible to input voltage variations. A 500 W prototype with rms input voltage of 220 V, output voltage of 450 V and switching frequency at 58,6 kHz of the modified bridgeless Boost rectifier was built to verify the theoretical study. Experimental results showed an improvement in total harmonic distortion from 22,17% to 4.88% and power factor from 0.977 to 0.996, both at rated power.

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