In modern applications, such as variable frequency electric drives, aircraft propulsion, electric vehicles, and uninterruptible power supply units, high power-dense, and efficient AC-AC power converters are the key to reducing power losses, thus limiting the overall costs, and improving the system's reliability. Power electronic equipment can be enhanced thanks to the continuous evolution of conversion topologies and advancements in power semiconductor technology. The design and the optimization strategy of the AC-AC 5-Level converter, called Interleaved 3-Phase 5-Level E-Type Back-to-Back Converter (I-3Φ5L BTB E-Type Converter), has been proposed in this article. The converter is analyzed and experimentally characterized to prove the configuration's high efficiency and high-power density. An introduction to the characteristics of the I-3Φ5L BTB E-Type Converter is described, and afterward, the optimization methodology to design the multilevel converter is presented. The converter prototype is illustrated, which achieves a peak efficiency of 98.2% and a total weight of 6.18 kg using hybrid technology for power semiconductors.

中文翻译：

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SiC-Si混合交错式三相五电平E型背靠背变换器设计

在现代应用中，例如变频电力驱动、飞机推进、电动汽车和不间断电源装置，高功率密度和高效的AC-AC电源转换器是降低功率损耗的关键，从而限制总体成本，并且提高系统的可靠性。由于转换拓扑的不断发展和功率半导体技术的进步，电力电子设备得以增强。本文提出了交流-交流五电平转换器的设计和优化策略，称为交错三相五电平E型背靠背转换器（I-3Φ5L BTB E型转换器） 。对转换器进行了分析和实验表征，以证明该配置的高效率和高功率密度。介绍了I-3Φ5L BTB E型变换器的特点，然后提出了设计多电平变换器的优化方法。图中所示的转换器原型采用功率半导体混合技术，峰值效率达到 98.2%，总重量为 6.18 kg。