Nova Estratégia de Modulação Aplicada em Conversor CA-CC Monofásico para Aplicação em Carregadores Veiculares Embarcados
DOI:
https://doi.org/10.18618/REP.2022.1.0020Keywords:
Conversor CA-CC bidirecional, Correção do fator de potência, estratégia de modulação, veículos elétricosAbstract
Este artigo apresenta uma nova estratégia de modulação do conversor CA-CC monofásico bidirecional, isolado em alta frequência, de único estágio e com correção do fator de potência,destinado para aplicação como carregador de baterias embarcado de veículos elétricos. Os interruptores do lado primário do conversor operam sob a modulação por largura de pulso (PWM) senoidal, permitindo correção do fator de potência e transferindo a energia da rede elétrica a um barramento CC. Após o transformador, o lado secundário é composto por uma estrutura em ponte completa em que os interruptores são comandados em alta frequência com razão cíclica fixa de 50%. Para a transferência da energia armazenada do barramento CC primário para a saída emprega-se a técnica de deslocamento de fase (phase-shift), utilizada em conversores DAB. Desta forma são desenvolvidas análises teóricas e equacionamentos utilizando-se da nova modulação, sendo validadas por resultados experimentais com um protótipo de potência de 500 W, tensão de entrada de 127 V/ 60 Hz e tensão de saída de 300 V.
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