New Single-Stage Soft-Switching Solid-State Transformer with Reduced Conduction Loss and Minimal Auxiliary Switch
New Single-Stage Soft-Switching Solid-State Transformer with Reduced Conduction Loss and Minimal Auxiliary Switch
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新型单级软开关固态变压器，具有更低的传导损耗和最少的辅助开关
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发表时间：
2020
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通讯作者：
D. Divan
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作者：
Liran Zheng;R. Kandula;D. Divan
本文提出了两种新的单级软开关固态Transformer拓扑。所提出的转换器实现了比现有解决方案更好的复杂性和辅助电路的益处之间的权衡，辅助电路用于软开关并解决Transformer泄漏引起的问题。与现有技术相比，该变换器通过从主功率路径中去除或移走辅助二极管，使导通损耗降低了约20%，而且，该变换器仅使用一个辅助开关，实现了辅助元件的最小化，即辅助元件数减少了>50%。事实上，由于变压器间的阻抗缩放定律，该装置消除了MV辅助开关、二极管和庞大的MV谐振电感器--这对MV到LV SST应用是一个重大改进。此外，所提出的变换器继承了软开关固态Transformer的优点，即全负载范围ZVS能力和低EMI。因此，所提出的低开关数转换器具有高效率、高功率密度和低EMI噪声的特征。的拓扑结构，设计和工作原理，并在600 V和2 kV从两个不同的原型实验结果进行验证。
This paper presents two new topologies of single-stage soft-switching solid-state transformer. The proposed converters achieve better trade-off than existing solutions between complexity and benefits from auxiliary circuits, which are used for soft switching and to address transformer leakage induced issues. Compared to the state-of-the-art, the proposed converters reduce conduction loss by approximately 20% via eliminating or moving the auxiliary diodes from the main power path. Moreover, the proposed converters achieve minimal auxiliary components by using only one auxiliary switch, i.e. >50% auxiliary counts reduction. In fact, the provision eliminates MV auxiliary switches, diodes, and a bulky MV resonant inductor due to impedance scaling law across transformers – significant improvement for MV-to-LV SST application. In addition, the proposed converters inherit the advantages of the soft-switching solid-state transformer, i.e. full load range ZVS capability and low EMI. As such, the proposed low-switch-count converters feature high efficiency, high power density, and low EMI noise. The topologies, design, and operating principles are presented and verified with experimental results at 600 V and 2 kV from two different prototypes.