RISS 검색 - 국내학술지논문

1
Loss Modeling of Inductive Components Employed in Power Electronic Systems

J. Muhlethaler,J. W. Kolar,A. Ecklebe 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
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Loss models of inductive components are thoroughly investigated, thereby all different aspects of loss modeling are considered. The impact of peak-to-peak flux density ?B, frequency f, DC premagnetization HDC, temperature T, core shape, minor and major loops, flux waveform, and material on core loss calculation are considered. In order to calculate winding losses, formulas for round conductors and litz wires, each including skin- and proximity effects (including the influence of an airgap fringing field) are included. A high level of accuracy is achieved by combining the best state-of-the-art approaches and by embedding newly-developed approaches into a novel loss calculation framework. The loss models are verified by FEM simulations and experimental measurements.
2
A Novel Approach for 3D Air Gap Reluctance Calculations

J. Muhlethaler,J. W. Kolar,A. Ecklebe 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
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An approach to accurately calculate the reluctance of an air gap is introduced. The approach is easy to handle as it is based on a modular concept where a simple basic geometry is used as a building block to describe different three dimensional air gap shapes. A high degree of accuracy is achieved as the approach is based on an analytical field solution.
3
“Magnetic Ear”-Based Balancing of Magnetic Flux in High Power Medium Frequency Dual Active Bridge Converter Transformer Cores

G. Ortiz,J. Muhlethaler,J. W. Kolar 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
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Semiconductor switches posses non-ideal behavior which, in case of isolated DC-DC converters, can generate DC voltage components in the voltage applied to the transformer. This DC voltage component is translated into a DC flux density component in the transformer core, increasing the risk of driving the core into saturation. In this paper, a novel noninvasive flux density measurement principle, called the “Magnetic Ear”, based on sharing of magnetic path between the main and an auxiliary core is proposed. The active compensation of the transformer DC magnetization level using this transducer is experimentally verified. Additionally, a classification of the previously reported magnetic flux measurement and balancing concepts is performed.
4
Multi-Objective Optimization of Ultra-flat Magnetic Components with a PCB-Integrated Core

C. Marxgut,J. Muhlethaler,F. Krismer,J.W. Kolar 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
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In future applications, e.g. in ultra-flat OLED lamp drivers or flat screen power supplies, ultra-flat power systems are highly demanded. Therefore, the design and implementation of a PCB-integrated flyback transformer for a 1 ㎜ thin PFC rectifier is under investigation. In this paper, an overview on several integration methods is given. It is shown that the PCB-integration of magnetic cores results in the required thickness of 1 mm and in a high energy density. Therefore, the design and the realization of ultra-flat magnetic components with PCB-integrated cores is detailed in this paper. The presented multi-objective design procedure determines the inductor and/or transformer setup optimal with respect to minimal losses and/or minimal footprint; for this purpose, the proposed design procedure considers all required electrical, magnetical, and geometrical parameters of the magnetic component. Furthermore, the design procedure accounts for anisotropic core loss behavior and includes an accurate reluctance model. Experimental results are used to verify the design procedure.

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