Solução Integrada para o Disparo de IGBTs Conectados em Série Baseada no Comando Típico de Tiristores
DOI:
https://doi.org/10.18618/REP.2019.4.0033Keywords:
Associação em série, circuito de disparo, IGBTs, inversores de média tensão, tiristores, TO-247Abstract
A utilização de IGBTs conectados em série ainda é um tema atual na literatura, a despeito de sua discussão ter se iniciado na década de 90. É intrigante que, apesar dos inúmeros estudos acadêmicos, atualmente não existam produtos comerciais disponíveis dentro do mercado de inversores de média tensão (até 4,16kV) e menor potência (até 1MW), utilizando essa tecnologia. Esse fato está relacionado com a dificuldade de garantir o compartilhamento dinâmico e estático de tensão entre IGBTs, originando circuitos de disparo complexos e com custo relativo elevado, se comparado com os componentes que esses pretendem comandar. Dessa forma, o presente artigo visa apresentar uma alternativa simples e de baixo custo, entretanto, efetiva para o disparo de IGBTs de baixa tensão associados em série, especificamente para o modelo de encapsulamento TO-247. São apresentados resultados experimentais mostrando os comportamentos da solução em várias condições operacionais.
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