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J. Imaoka,Y. Ishikura,K. Ito,T. Aoki,M. Noah,M. Yamamoto 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Utilizing powder cores in many power electronics applications have been gaining much attention due to their attractive magnetic properties. However, it is quite challenging for the circuit designer to choose the proper core, as there are many kinds of magnetic powder cores available in the market. Therefore, due to the limitation of a single magnetic material property, it is often difficult to realize high power conversion efficiency within wide load ranges, including light and heavy load conditions. This paper proposes a novel design method of the multi-material inductor which combines multiple powder cores having different material properties. The aim of this work is to provide improved efficiency over the entire load range of power converters. The experimental results have proven that the inductor with multi-material powder cores can improve the efficiency over wide load range. The validity and effectiveness of the proposed magnetic design method are confirmed from theoretical analysis, simulation and experimental tests.
Modeling of Lithium-Ion Batteries with Constant Phase Element and Butler-Volmer’s Equation
T. Yamahigashi,J. Shimura,K. Shibuya,Y. -H. Wu,K. Shigematsu,T. Hosotani,J. Kuromi,J. Imaoka,M. Yamamoto 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
An equivalent circuit model of lithium-ion batteries which has a nonlinear resistor governed by Butler- Volmer’s equation and a constant phase element was investigated. The current dependence of the real battery could be reproduced well by the contribution of the nonlinear resistor, and the transient response of voltage could be reproduced well by the contribution of the constant phase element.