This article presents a family of resonant switched-capacitor (SC) converters with multiple operating phases, herein named “Multi-Resonant SC Converter”. These converters can be synthesized from the basic two-phase SC topologies, such as the Doubler and the Series-Parallel, and are capable of achieving the same conversion ratio with fewer capacitors and switches. The augmenting inductor can resonantly charge/discharge all flying capacitors at different resonances, thereby facilitating soft-charging and soft-switching operation. Based upon this concept, an 8-to-1 Multi-Resonant-Doubler (MRD) converter and a 6-to-1 Cascaded Series-Parallel (CaSP) converter are proposed and analyzed. Both theoretical analysis and experimental results from a practical implementation are provided to demonstrate the benefits of the multi-resonant approach. The designed hardware prototype is configurable and can achieve one of the best overall in-class performances for the intermediate bus conversion in data centers. At 48-to-6 V conversion, the prototype achieves 98.6% peak efficiency (98.0% including gate drive loss) and 1675 W/in$^{3}$ power density. At 48-to-8 V conversion, the prototype achieves 99.0% peak efficiency (98.5% including gate drive loss) and 2230 W/in$^{3}$ power density.

中文翻译：

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多谐振开关电容转换器：通过减少元件数量实现高转换比

本文介绍了一系列具有多个工作阶段的谐振开关电容 (SC) 转换器，本文称为“多谐振 SC 转换器”。这些转换器可以从基本的两相 SC 拓扑（例如倍增器和串并联）合成，并且能够以更少的电容器和开关实现相同的转换比。增强电感可以在不同的谐振频率下对所有飞跨电容进行谐振充放电，从而促进软充电和软开关操作。基于此概念，提出并分析了 8 比 1 多谐振倍频 (MRD) 转换器和 6 比 1 级联串并联 (CaSP) 转换器。提供了来自实际实现的理论分析和实验结果，以证明多谐振方法的好处。设计的硬件原型是可配置的，可以实现数据中心中间总线转换的最佳整体性能之一。在 48 至 6 V 转换时，原型实现了 98.6% 的峰值效率（98.0% 包括栅极驱动损耗）和 1675 W/in$^{3}$功率密度。在 48 至 8 V 转换时，原型实现了 99.0% 的峰值效率（98.5% 包括栅极驱动损耗）和 2230 W/in$^{3}$功率密度。