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Article
Engineering, Electrical & Electronic
Silvano Cruciani et al.
Summary: In this study, a new numerical method is proposed to model the electric behavior of a single bundle litz wire with a large number of strands. The method combines 2-D finite element analysis to evaluate the series impedance matrix of the cable and a mathematical algorithm for discrete transposition of the strands to simulate bunching and twisting. The results show excellent agreement with experiments and 3-D finite element analysis, with an error in ac-to-dc resistance ratio of less than 10% in tested configurations. The computational cost of the method is also low and comparable to 2-D finite element analysis.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Review
Engineering, Electrical & Electronic
Liting Li et al.
Summary: This article provides a comprehensive review and classification of modified dual-active-bridge (DAB) converters, and proposes a methodology for modifying DAB topologies. Basic cells are introduced, and by combining these cells, modified DAB converters are derived and classified based on their structural characteristics. The characteristics, merits, and demerits of the modified DAB converters are concluded, and the evolvement history, future trends, and derivation of new topologies are analyzed. The article aims to present a clear picture of the general law and framework of the modified DAB topologies and inspire the derivation of new DAB topologies to address specific requirements.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
D. Lin et al.
Summary: A method is proposed to efficiently predict eddy current loss of Litz wire coils in finite element analysis. The method homogenizes the wire bundle by utilizing analytical solutions and introducing a fill factor, enabling more accurate calculation of eddy current loss.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Engineering, Electrical & Electronic
Jiahua Lyu et al.
Summary: This article proposes a novel calculation method for uninsulated twisted wire (UTW) and compares its performance with that of Litz wire (LW). The results show that UTW can have similar performance to LW under certain conditions and may be used as a replacement.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Seema Mir Akbar et al.
Summary: This article investigates the losses of high-frequency transformers in DAB converters and proposes the reduction of losses by selecting optimal modulation schemes. Through finite element analysis and experimental validation, the effect of modulation schemes on transformer losses is demonstrated. Additionally, a generalized framework for analyzing and optimizing transformer losses in isolated converters is proposed.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Noah J. Salk et al.
Summary: This article presents a semi-analytical method for predicting ac loss in commercial Litz wires. The method uses finite-element simulations to calculate proximity fields in a coil system and analytical solutions to compute frequency-dependent loss. The approach is demonstrated and validated with different Litz wire constructions and experimental results. The article calls for Litz wire manufacturers to provide an empirical fabrication factor specification for consumers to predict conductor performance.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Engineering, Electrical & Electronic
Zhenkai Cao et al.
Summary: This article proposes an orthogonal decoupling magnetic integrated structure (ODMIS) to reduce the volume of the transformer and inductor in a DAB converter. ODMIS achieves the magnetic decoupling of the transformer and inductor and provides optimized decoupling conditions to minimize core loss. Experimental results demonstrate that ODMIS has high overall efficiency and power density.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Piotr Czyz et al.
Summary: This article investigates the component and system-level performance limits of air-cooled solid-state transformers using either air-core or magnetic-core transformers. Detailed designs of two prototypes are presented, and comprehensive experimental characterizations are conducted to validate the derived performance limits. The results show that both prototypes achieve high efficiencies.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Thomas Ewald et al.
Summary: This article proposes analytical formulas to accurately calculate the inductance and the additional eddy current losses in gapped inductors with solid round wire and Litz wire windings. The analytical formulas are verified by measurements, showing that the proposed models are accurate over a wide-frequency range.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhe Zhao et al.
Summary: The rapid development of more electric aircraft has led to a growing demand for high-power converters that are lightweight and compact for onboard power distribution. This article proposes a feasible solution using an isolated dc/dc converter with a medium-frequency transformer (MFT) by designing a matrix core transformer (MCT) with improved electromagnetic and thermal performance. The MCT has a superior heat dissipation ability, allowing for effective cooling of the high current windings. An optimization methodology for MCT design is also presented. The experimental results confirm the theoretical design, achieving a power density of 17.7 kW/L and efficiency of 99.63%.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2022)
Article
Engineering, Electrical & Electronic
Thomas Ewald et al.
Summary: This article proposes an analytical model for accurately calculating the inductance and additional eddy current losses in gapped inductors with foil windings, providing a basis for optimizing high-frequency foil inductors. The frequency dependency of the inductance due to the shielding effect of the foil conductors is also discussed.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Andreas Rosskopf et al.
Summary: This study proposes a new method for impedance extraction, which significantly improves the computational speed of high-frequency litz wires by reducing the calculation effort and utilizing a new multilevel Voronoi approach. Compared to the traditional method, this new method requires less computing resources and provides accurate frequency-dependent impedances.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Satyaki Mukherjee et al.
Summary: The article explores the use of orthogonal air-gap technique in high-frequency inductors to reduce ac resistance, demonstrating significant reduction in inductor losses compared to standard air gap designs.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Stefan Ehrlich et al.
Summary: This article presents a fast numerical calculation method for realistic power losses of high-frequency Litz wires, taking into account the imperfect structure of the wires and examining the impact of bundle structure on losses. The method allows for selecting suitable Litz wires for specific applications or designing Litz wires with realistic twisting structures.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Yoshitsugu Otomo et al.
Summary: This article presents a novel analysis method for losses in litz wire by introducing macroscopic complex permeability to evaluate eddy current and circulating current losses. It is shown that the proposed method effectively calculates proximity effect loss for solenoidal and spiral coils without magnetic cores. Additionally, the method accurately predicts losses for magnetic reactors where circulating current loss cannot be ignored.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Engineering, Electrical & Electronic
Zhicheng Guo et al.
Summary: This article presents a design and optimization methodology for a 200-kW medium-frequency transformer based on low-loss magnetic core, achieving high power density and efficiency through a parallel-concentric winding structure and innovative cooling and insulation design.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Multidisciplinary
Emilio Plumed et al.
APPLIED MATHEMATICAL MODELLING
(2020)
Article
Engineering, Electrical & Electronic
Alberto Delgado et al.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2020)
Article
Engineering, Electrical & Electronic
Marko Mogorovic et al.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2019)
Article
Engineering, Electrical & Electronic
Rachel S. Yang et al.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2019)
Article
Engineering, Multidisciplinary
Rafal P. Wojda et al.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2018)
Article
Engineering, Electrical & Electronic
Michael Leibl et al.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2017)
Article
Engineering, Electrical & Electronic
Andreas Rosskopf et al.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2016)
Article
Automation & Control Systems
Ernesto L. Barrios et al.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2015)
Article
Engineering, Multidisciplinary
Xi Nan et al.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2009)
Article
Engineering, Electrical & Electronic
A Reatti et al.
IEEE TRANSACTIONS ON MAGNETICS
(2002)
Article
Engineering, Electrical & Electronic
F Tourkhani et al.
IEEE TRANSACTIONS ON MAGNETICS
(2001)
