High step-down, high output current converters are required in many common and emerging applications, including data center server power supplies, point-of-load converters, and electric vehicle charging. Miniaturization is desirable but challenging owing to the high step-down transformer ubiquitously used in these converters. In this work, a miniaturized split-phase half-turn transformer is demonstrated, which leverages the well-established parallelization benefit of employing multiple phases, as in a matrix transformer, with the dramatic reduction in copper loss associated with the relatively new Variable Inverter/Rectifier Transformer (VIRT) architecture. While these techniques have been described in earlier studies, their combination has not been well explored. A detailed design procedure is described and is used to develop a 97.7% peak efficiency and 97.1% full-load efficiency prototype having a transformer that is 12%–36% smaller than best-in-class designs in the literature at the same power level while also being more efficient. This work showcases the miniaturization benefit of employing multiphase, fractional-turn transformers in high step-down, high output current applications and provides comprehensive guidance to designers interested in applying and extending these techniques.

中文翻译：

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使用小型分相分数匝平面变压器的 380-12V、1kW、1MHz 转换器


许多常见和新兴应用都需要高降压、高输出电流转换器，包括数据中心服务器电源、负载点转换器和电动汽车充电。由于这些转换器中普遍使用高降压变压器，小型化是可取的，但也具有挑战性。在这项工作中，展示了一种小型化分相半匝变压器，它利用了采用多相（如在矩阵变压器中）的成熟并行化优势，并大幅降低了与相对较新的可变逆变器/相关的铜损。整流变压器 (VIRT) 架构。虽然这些技术已在早期研究中描述过，但它们的组合尚未得到很好的探索。描述了详细的设计过程，并用于开发峰值效率为 97.7% 、满载效率为 97.1% 的原型，该原型的变压器比文献中相同功率水平的最佳设计小 12%–36%同时也更加高效。这项工作展示了在高降压、高输出电流应用中采用多相分数匝变压器的小型化优势，并为有兴趣应用和扩展这些技术的设计人员提供全面的指导。