Aiming to address the growth and the integration of renewable sources and electronic loads, different types of dc-dc topologies with specific features have been proposed, going from medium frequency isolated Modular Multilevel Converter to Switched Capacitor and Hybrid Switched Capacitor topologies. In this paper, a bidirectional Modular Multilevel Converter based Hybrid Switched Capacitor dc-dc converter is presented, featuring transformerless structure, automatic total arm voltages clamping/balancing, voltage static gain independent of the submodules quantity and efficiency with reduced duty cycle influence. The topology operates with a Quasi-Two-Level modulation, which provides passive components volume/weight reduction, a degree of freedom regarding the dv/dt{dv/dt} applied on the magnetic windings and basis to perform the submodule capacitor voltages equalization within each arm. The topology operating principles are approached by an average value static analysis, while an instant value static analysis is used to estimate the operating current spike worst case. A 1.17{1.17} kW, 350/200{350/200} V laboratory scale prototype using IGBTs is implemented to experimentally confirm the theoretical approaches.

中文翻译：

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基于 MMC 的混合开关电容器 DC-DC 转换器


为了解决可再生能源和电子负载的增长和集成问题，人们提出了具有特定功能的不同类型的 DC-DC 拓扑，从中频隔离式模块化多电平转换器到开关电容器和混合开关电容器拓扑。本文提出了一种基于双向模块化多电平变换器的混合开关电容DC-DC变换器，具有无变压器结构、自动总臂电压钳位/平衡、电压静态增益独立于子模块数量和效率以及减少占空比影响。该拓扑采用准两级调制，可减少无源元件的体积/重量、施加在磁性绕组上的 dv/dt{dv/dt} 的自由度以及在内部执行子模块电容器电压均衡的基础。每只手臂。通过平均值静态分析来接近拓扑工作原理，同时使用瞬时值静态分析来估计工作电流尖峰最坏情况。实施了使用 IGBT 的 1.17{1.17} kW、350/200{350/200} V 实验室规模原型，以通过实验验证理论方法。