A Non-Isolated High Step-Up Interleaved DC-DC Converter with Diode-Capacitor Multiplier Cells and Dual Coupled Inductors

In this paper, a non-isolated high step-up dc-dc converter is presented. The proposed converter is composed of an interleaved structure and diode-capacitor multiplier cells for interfacing low-voltage renewable energy sources to high-voltage distribution buses. The aforementioned topology can provide a very high voltage gain due to employing the coupled inductors and the diode-capacitor cells. The coupled inductors are connected to the diode-capacitor multiplier cells to achieve the interleaved energy storage in the output side. Furthermore, the proposed topology provides continuous input current with low voltage stress on the power devices. The reverse recovery problem of the diodes is reduced. This topology can be operated at a reduced duty cycle by adjusting the turn ratio of the coupled inductors. Moreover, the performance comparison between the proposed topology and other converters are introduced. The design considerations operation principle, steady-state analysis, simulation results, and experimental verifications are presented. Therefore, a 500-W hardware prototype with an input voltage of 30-V and an output voltage of 1000-V is built to verify the performance and the theoretical analysis.Comment: 2020 North American Power Symposiu

Conversores CC-CC não isolados com ampla taxa de conversão baseados na célula de comutação de múltiplos estados e células multiplicadoras de tensão

This work presents the study and design of a family of non-isolated high step-up dc-dc converters, based on the multi-state switching cell (MSSC) and voltage multiplier cells (VMCs). These converters can be used in applications such as uninterruptible power systems and electric vehicles, which employ a few kilowatts power and require high voltage gain. Inherent advantages in the proposed topologies include reduced current and voltage stresses on the semiconductors, improved thermal distribution, good current sharing among the phases, and reduced dimensions of filter elements. Another relevant aspect is that the derived converters present modularity in terms of the possibility of extending not only the voltage gain, but also the rated power. A comprehensive theoretical analysis of the 4SSC-VMC boost converter, deriving from the proposed family, is performed. Experimental results obtained from a 1.3 kW prototype are presented and discussed to validate the theoretical assumptions.Este trabalho apresenta o estudo e a concepção de uma família de conversores CC-CC de alto ganho de tensão, não isolados, baseados na célula de comutação de múltiplos estados (multistate switching cell – MSSC) e células multiplicadoras de tensão (voltage multiplier cells – VMCs). Estes conversores podem ser empregados em aplicações como sistemas ininterruptos de energia e veículos elétricos, que empregam níveis de potência da ordem de alguns quilowatts e que os níveis de tensão de entrada são muito mais baixos do que os de saída. As vantagens inerentes às topologias propostas incluem esforços de tensão e corrente reduzidos nos semicondutores, melhor distribuição térmica, compartilhamento equilibrado de corrente entre as fases e dimensões reduzidas dos elementos magnéticos. Outro aspecto relevante é que os conversores derivados apresentam modularidade quanto à possibilidade de estender não apenas o ganho de tensão, mas também a potência nominal. Uma análise teórica abrangente do conversor boost 4SSC-VMC oriundo da família proposta é realizada. Resultados experimentais obtidos a partir de um protótipo de 1,3 kW são apresentados e discutidos para validar as considerações teóricas