Optimization of High-Density and High-Efficiency Switched-Tank Converter for Data Center Applications
Optimization of High-Density and High-Efficiency Switched-Tank Converter for Data Center Applications
复制标题
适用于数据中心应用的高密度、高效率开关储能转换器的优化
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Shuai Jiang
中科院分区：
文献类型：
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作者：
X. Lyu;Yanchao Li;Na Ren;Chenhao Nan;Dong Cao;Shuai Jiang
提出了一种开关储能变换器（STC）的设计方法。通过功耗故障分析，为器件优化指明了方向和途径。结果表明，当输出功率大于150 W时，开关器件导通损耗、印刷电路板（PCB）损耗和电感损耗变得显著。对四种开关的功率损耗进行了计算和比较，为开关器件的选择提供了依据。谐振电容器经过精心设计，可同时满足电流应力和涟漪要求。另一方面，谐振电感的优化设计和PCB布局进行了充分的研究。给出了铁损模型，并比较了不同铁损材料对铁损的影响。此外，设计了微调电感绕组结构，以实现最低的绕组损耗。此外，PCB布局进行了优化，以获得每个操作状态的短回路长度。在硬件优化的基础上，提出了一种改进的控制方法，通过调整开关器件的导通时间来减小环流功率。为了验证优化工作，STC的原型建立和测试。实验结果表明，国家的最先进的性能的98.71%的效率和1000 W/in 3的高功率密度实现。
In this paper, the design methodology of switched-tank converter (STC) is presented. The power loss breakdown analysis is conducted to point out the directions and paths for components optimization. It is revealed that the switching device conduction loss, printed circuit board (PCB) loss, and inductor loss become significant when output power is >150 W. Power loss of four switches is calculated and compared for switching device selection. The resonant capacitor is carefully designed to meet both current stress and ripple requirements. On the other hand, optimal design of the resonant inductors and PCB layout are fully investigated. The core loss model is provided, and different core materials are compared to minimize the core loss. Besides, a fine-tuned inductor winding structure is designed to achieve the lowest winding loss. Furthermore, PCB layout is optimized to get short loop length for each operation state. In addition to the hardware level optimization, an improved control method is proposed, in which the conduction time of switching devices is tuned to mitigate the circulating power. To verify the optimization work, a prototype of STC is built and tested. The experimental results indicate that a state-of-the-art performance of 98.71% efficiency and a 1000 W/in3 high power density is achieved.