This paper presents the analysis and optimization procedure of a two-stage bidirectional AC/DC power supply. The exemplary power supply consists of a silicon carbide based active front end and a dual active bridge DC/DC converter. It is designed to supply 600 V DC applications from universal low voltage AC grids with a power up to 6 kW. The paper includes the topology and design considerations, as well as an in-depth loss distribution analysis based on a validated loss model. The loss model is then utilized for an operation space optimization. A special focus is drawn to the loss model and the optimization: It is based on analytical equations optimized for a low calculation effort. This enables quick modeling of a large operation space. Those results can both be used to validate design considerations as well as to optimize operating parameters. The presented dynamic operating parameter optimization enables a loss reduction at full load by 14% and at half load by even 48%. By means of the optimization the operating area can be expanded, losses decreased, and thermal stress reduced.

中文翻译：

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两级交直流电源损耗分布分析与优化

本文介绍了两级双向交流/直流电源的分析和优化过程。示例性电源由基于碳化硅的有源前端和双有源桥式 DC/DC 转换器组成。它旨在为通用低压交流电网提供 600 V 直流应用，功率高达 6 kW。该论文包括拓扑和设计注意事项，以及基于经过验证的损耗模型的深入损耗分布分析。然后利用损失模型来优化操作空间。特别关注损失模型和优化：它基于针对低计算量而优化的分析方程。这使得能够对大操作空间进行快速建模。这些结果既可用于验证设计考虑因素，也可用于优化操作参数。所提出的动态运行参数优化使满载时的损耗降低了 14%，半载时的损耗甚至降低了 48%。通过优化，可以扩大操作区域、减少损失并减少热应力。