This article proposes a novel magnetic design method for multi-material inductor which combines multiple powder cores with different magnetic characteristics. The purpose of this work is to flatten the power conversion efficiency curve over wide load ranges of power converters using the multi-material inductor. For the purpose of simplicity, the multi-material inductor which consists of two powder cores with different characteristics is taken as an example. A design method of multi-material inductor is proposed and demonstrated with a modeling method considering the non-linear relative permeability. The experimental results show that the multi-material inductor using two powder cores can improve the power conversion efficiency of the bidirectional converter over wide load ranges compared with other two single-material inductors. The proposed inductor succeeded to flatten the efficiency curve of the converter and realize a higher power conversion efficiency at the full-load condition. The validity and effectiveness of the proposed magnetic design method are confirmed from theoretical analysis and experimental results.

中文翻译：

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多材料电感器的磁性设计方法在宽负载范围内使功率转换器的效率曲线变平

本文提出了一种新的多材料电感器磁设计方法，该方法将具有不同磁特性的多个粉芯组合在一起。这项工作的目的是在使用多材料电感器的电源转换器的宽负载范围内使电源转换效率曲线变平。为简单起见，以由两个不同特性的磁粉芯组成的多材料电感器为例。提出了一种多材料电感器的设计方法，并通过考虑非线性相对磁导率的建模方法进行了演示。实验结果表明，与其他两种单材料电感相比，采用两个粉芯的多材料电感可以提高双向转换器在较宽负载范围内的功率转换效率。所提出的电感器成功地拉平了转换器的效率曲线，并在满载条件下实现了更高的功率转换效率。理论分析和实验结果证实了所提出的磁设计方法的有效性和有效性。