Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Capacitor chaveado, Conversor Forward

Resumo
Este artigo propõe um conversor CC-CC abaixador para operar com alta tensão de entrada (na ordem de kV) e fornecer tensões de saída na ordem de V, com o intuito de aplicar a estrutura em fontes auxiliares conectadas em média e alta tensão. O conversor proposto baseia-se na integração de células de capacitor chaveado com o conversor Forward, o que permite utilizar interruptores de menor tensão de bloqueio devido à divisão da tensão de entrada. O estudo teórico dessa integração é abordado, no qual aborda-se as características estáticas e o estudo da comutação. Um protótipo com quatro células a capacitor chaveado e 200 W / 2 kV para 24 V de característica foi construído para validação do estudo teórico apresentado. Para esses níveis de tensão e potência, obteve-se um rendimento de 90,66%.

Title: Medium Voltage Fed Forward Converter with Switched Capacitor Cells for Auxiliary Power Supply Applications

Keywords: Forward converter, Switched capacitor

Abstract
This paper proposes a step-down dc-dc converter for application in auxiliary power supplies (APS) fed at medium and high voltage. The proposed converter is based on the integration of switched-capacitor cells and the Forward converter, which make it possible to apply semiconductors with lower blocking voltage due to the input voltage division performed. The theoretical study of the hybrid structure is approached, in which the static and the switching behavior are detailed. A small-scale laboratory prototype with four switched-capacitor cells rated at 200 W / 2 kV to 24 V was built to corroborate the theoretical study. For this voltage and power levels, an efficiency of 90.66% was obtained.

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