Improvement of light load efficiency of Dual Active Bridge DC-DC converter by using dual leakage transformer and variable frequency

G. Guidi, M. Pavlovsky, A. Kawamura, T. Imakubo, Y. Sasaki
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引用次数: 70

Abstract

Dual Active Bridge (DAB) topology performs very well for converter output/input ratio close to transformer ratio. However, if a considerable deviation from the transformer ratio is required the conversion efficiency drops significantly. The approach presented in this paper uses variable AC link reactance to improve the DAB performance during operation at light load. The variable reactance is obtained by using a variable frequency in combination with so-called dual leakage transformer. Simple phase-shift control is used, and the switching frequency is varied in order to minimize the peak transformer current. In addition to that, the dual leakage transformer proposed in this paper has a winding configuration yielding a high leakage inductance at low currents and low leakage inductance at high currents. A fully operational prototype was built, demonstrating a power density of 7.1 kW/Liter with forced air cooling, and a peak efficiency at rated 4 kW load equal to 96.6 %. The presented variable reactance approach resulted in more than 10 % efficiency improvement over the conventional DAB design in the most critical point.
采用双漏电变压器和变频技术提高双有源桥式DC-DC变换器轻载效率
双有源桥(DAB)拓扑在变换器输出/输入比接近变压器比时表现良好。然而,如果与变压器比有相当大的偏差,则转换效率会显著下降。本文提出了一种采用可变交流链路电抗的方法来改善轻负荷运行时DAB的性能。可变电抗是通过使用变频与所谓的双漏变压器相结合而获得的。采用简单的移相控制,改变开关频率以使变压器的峰值电流最小。此外,本文提出的双漏电变压器具有小电流时高漏电感和大电流时低漏电感的绕组结构。一个完全运行的原型机已经建成,在强制空气冷却的情况下,功率密度为7.1 kW/ l,额定4 kW负载时的峰值效率为96.6%。所提出的变电抗方法在最关键的点上比传统DAB设计的效率提高了10%以上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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