This paper presents an interleaved switchedcapacitor multilevel ANPC converter (SCANPC) for high power density applications. To demonstrate the feasibility of the idea, the analysis and design of the converter are made initially for one cell and after for the two cells interleaved configuration. In addition, it is used a power loss estimation methodology for the Gallium Nitride switches. Simulations and power loss estimations are shown for a 4kW power prototype.
Multilevel rectifiers allow improving the system performance by reducing the harmonic content of synthesized voltages, which leads to minimizing the size and weight of the grid interface filters. Alternatively, the use of unidirectional PWM rectifiers is particularly interesting in situations where there is nonregenerative operation, since it is possible to operate with fewer active switches. This work proposes a unidirectional five-level rectifier which reduces the number of components needed and allows the automatic regulation of floating capacitors voltages, without employing complex control techniques with sensors and/or additional circuits. In addition, the proposed rectifier requires devices with lower reverse voltages and, consequently, the number of components in series can be minimized. Simulation results demonstrate the validity of the proposal. Resumo: Retificadores multiníveis permitem melhorar o desempenho do sistema em virtude da redução do conteúdo harmônico das tensões sintetizadas, o que conduze a minimizar o tamanho e peso dos filtros de interface com a rede. Alternativamente, o uso de retificadores PWM unidirecionais é particularmente interessante em situações onde não há regeneração de energia, pois sua operação é possível com ainda menor número de interruptores ativos. Dessa forma, este trabalho propõe um retificador cinco níveis unidirecional que reduz o número de componentes necessários e possibilita a regulação automática das tensões nos capacitores flutuantes, sem empregar técnicas de controle com sensores e/ou circuitos adicionais. Em adição, o retificador proposto requer dispositivos com tensões reversas menores e, consequentemente, o número de componentes em série pode ser minimizado. Resultados de simulação demostram a validade da proposta.
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