By using phase-shift control, a much higher converter operating frequency is achieved compared to the switching frequency. The converter also exhibits simplicity and scalability with no necessary requirement of high-voltage isolation transformers. The proposed converter achieves high-voltage step-down ratio depending on the number of submodules. To provide a simple solution with inherent voltage balancing, this paper presents a new resonant MMC topology for dc–dc conversion. However, this arrangement requires a large number of high isolation voltage transformers and a complicated balancing control scheme. Power electronics transformers can be used for high step-down ratio dc–dc power conversion, with high power rating and efficiency achieved. Modular multilevel converters (MMCs) have become increasingly interesting in dc–dc applications, as there is a growing demand for dc–dc converters in high-voltage applications.
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