A 48-to-6 V Multi-Resonant-Doubler Switched-Capacitor Converter for Data Center Applications
A 48-to-6 V Multi-Resonant-Doubler Switched-Capacitor Converter for Data Center Applications
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适用于数据中心应用的 48 至 6V 多谐振倍频器开关电容器转换器
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
R. Pilawa
中科院分区：
文献类型：
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作者：
Zichao Ye;Rose A. Abramson;R. Pilawa
与传统的开关电容变换器相比，多相开关电容变换器可以用更少的电容和开关器件实现相同的变换比。这一特性使得多相SC转换器成为具有大转换比的应用的有吸引力的候选者。为了通过实现软充电和软开关操作来进一步提高性能，SC转换器可以被变换为具有增强电感器的谐振开关电容器（ReSC）转换器。这项工作提出了一种8比1多相ReSC转换器设计，其具有尽可能少的开关和电容数量，以实现增益。理论分析和实验结果从一个实际的实施提供证明的好处，多相谐振的方法。构建并测试了一个48至6 V转换器原型，输出电流为40 A，适用于数据中心应用。该原型实现了98.6%的峰值效率（98.0%，包括栅极驱动损耗）和1675 W/in 3的功率密度，实现了同类产品中最好的整体性能之一。
Compared with conventional switched-capacitor (SC) converters with two operating phases, multi-phase SC converters can achieve the same conversion ratio with fewer capacitors and switches. This feature makes multi-phase SC converters an attractive candidate for applications with large conversion ratios. To further improve the performance by enabling soft-charging and soft-switching operations, SC converters can be transformed to resonant switched-capacitor (ReSC) converters with augmented inductor(s). This work presents an 8-to-1 multiphase ReSC converter design that features the least-possible number of switches and capacitors for the achieved gain. Both theoretical analysis and experimental results from a practical implementation are provided to demonstrate the benefits of the multi-phase resonant approach. A 48-to-6 V converter prototype with 40 A output current for data center applications was built and tested. The prototype achieved 98.6% peak efficiency (98.0% including gate drive loss) and 1675 W/in3 power density, achieving one of the best overall in-class performances.