With the aim towards lighter and more efficient electrical systems in future aircraft, design of DC/DC converters with high efficiency, power density and improved thermal management becomes necessary. This paper investigates the detailed design of isolated bidirectional DC/DC converters for more electric aircraft (MEA). Use of wide bandgap (WBG) devices to enhance system efficiency is considered. A transformer optimization technique based on switching frequency for different converter topologies is investigated. The control strategy of the discussed configurations are verified in the PLECS simulation environment. Dual active bridge (DAB), input-series output-parallel (ISOP), neutral point clamped (NPC) and active neutral point clamped (ANPC) converters are considered to exploit benefits offered by WBG devices for MEA. A comparison is performed in terms of efficiency, thermal management, power density and electromagnetic interference (EMI). The results indicate that the ANPC converter is better for efficiency, thermal management and power density. The DAB converter showed similar results to the ISOP with the DAB yielding higher efficiency. The NPC and ANPC configurations resulted in the best EMI performance. The NPC converter proved to be the least effective solution with regard to efficiency, thermal management and power density.

中文翻译：

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使用WBG器件的隔离双向DC / DC转换器在更多电动飞机上的比较

为了在未来的飞机中实现更轻，更高效的电气系统，必须设计出具有高效率，功率密度和改进的热管理的DC / DC转换器。本文研究了用于更多电动飞机（MEA）的隔离双向DC / DC转换器的详细设计。考虑使用宽带隙（WBG）设备来提高系统效率。研究了基于开关频率的不同变换器拓扑的变压器优化技术。在PLECS仿真环境中验证了所讨论配置的控制策略。双有源桥（DAB），输入串联输出并行（ISOP），中性点钳位（NPC）和有源中性点钳位（ANPC）转换器被认为可利用WBG设备为MEA提供的优势。在效率，热管理，功率密度和电磁干扰（EMI）方面进行比较。结果表明，ANPC转换器具有更高的效率，热管理和功率密度。DAB转换器显示出与ISOP相似的结果，而DAB产生了更高的效率。NPC和ANPC配置带来了最佳的EMI性能。在效率，热管理和功率密度方面，NPC转换器被证明是最无效的解决方案。NPC和ANPC配置带来了最佳的EMI性能。在效率，热管理和功率密度方面，NPC转换器被证明是最无效的解决方案。NPC和ANPC配置带来了最佳的EMI性能。在效率，热管理和功率密度方面，NPC转换器被证明是最无效的解决方案。