Characterization of Nanocrystalline Flake Ribbon for High Frequency Magnetic Cores

Article Engineering, Electrical & Electronic

Vertical Stacked LEGO-PoL CPU Voltage Regulator

Jaeil Baek et al.

Summary: This article presents a 48-1 V merged-two-stage hybrid-switched-capacitor converter with a linear extendable group operated point-of-load (LEGO-PoL) architecture for ultrahigh-current microprocessors. It features 3-D stacked packaging and coupled inductors for miniaturized size, fast speed, and vertical power delivery. The architecture is highly modular and scalable, leveraging the advantages of switched-capacitor circuits and multiphase buck circuits to achieve soft charging, current sharing, and voltage balancing.

IEEE TRANSACTIONS ON POWER ELECTRONICS (2022)

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Article Engineering, Electrical & Electronic

Design and Demonstration of a 100 kW High-Frequency Matrix Core Transformer for More Electric Aircraft Power Distribution

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)

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Article Automation & Control Systems

Fully-Integrated Planar Transformer With a Segmental Shunt for LLC Resonant Converters

Sajad Arab Ansari et al.

Summary: This article presents two topologies for high leakage inductance in shunt-inserted integrated magnetic transformers. The topologies use high-permeability magnetic shunt segments and small air gaps to replace the conventional low-permeability shunt, achieving the same bulk permeability while using lower cost magnetic materials. The article provides modeling and design methods to accurately estimate leakage and magnetizing inductances, and verifies them through theoretical analysis, finite-element analysis, and experimental implementation. The performance of the proposed topologies is confirmed through the construction of an LLC resonant converter, showing reduced volume and cost.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS (2022)

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Article Engineering, Electrical & Electronic

Reduction of AC Winding Losses Due to Fringing-Field Effects in High-Frequency Inductors With Orthogonal Air Gaps

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)

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Article Engineering, Electrical & Electronic

Design Flexibility of a Modular Low-Loss High-Frequency Inductor Structure

Rachel S. Yang et al.

Summary: This article investigates a novel inductor structure with a modified pot core that offers excellent performance for a wide range of inductance and power handling requirements. The structure can achieve about half the loss of conventional designs at high frequency and provides new opportunities for the practical production of low-loss HF inductors. The core pieces used in the structure can be scaled by 4x in volume, compared to conventional core families, while still maintaining high performance over a wide design space.

IEEE TRANSACTIONS ON POWER ELECTRONICS (2021)

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Article Automation & Control Systems

Research on Novel Flexible High-Saturation Nanocrystalline Cores for Wireless Charging Systems of Electric Vehicles

Meng Xiong et al.

Summary: A novel flexible nanocrystalline core is proposed to replace the ferrite core in wireless power transfer for electric vehicles. Through improvement processes, the nanocrystalline core achieved excellent results in parameter measurements and loading tests.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS (2021)

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Proceedings Paper Energy & Fuels

Novel Flexible Nanocrystalline Flake Ribbons for High-Frequency Transformer Design

Xinru Li et al.

Summary: This paper introduces a novel nanocrystalline ribbon material to address the high-frequency eddy current loss issue. Experimental results show that the core losses of nanocrystalline flake ribbons decrease by 30% compared to traditional nanocrystalline ribbons, and further testing in high-frequency transformers demonstrates a reduction of over 50% in core losses compared to ferrite transformers.

2021 THIRTY-SIXTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2021) (2021)

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Article Engineering, Electrical & Electronic