Novel Method for Making Surface Insulation Layer on Fe-Based Amorphous Alloy Powder by Surface-Modification Using Two-Step Acid Solution Processing

Sugimura, Kanako; Yabu, Naoki; Sonehara, Makoto; Sato, Toshiro

doi:10.1109/tmag.2018.2834467

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…Therefore, the stack structure has a small leakage flux causing eddy currents, so the AC resistance reduction of MST is less effective in the stack structure. Magnetic composite materials used in MST are characterized by low loss at high frequencies, low magnetic permeability, and high saturation flux density [20,21].…”

Section: Magnetic Field Simulation Of Planar Inductorsmentioning

confidence: 99%

Reduction of Alternating‐Current Resistance and Heat Generation of Spiral Inductors with Magnetic Sealing Technique

Shimura

Kanaya

Kobayashi

et al. 2023

IEEJ Transactions Elec Engng

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As direct current-direct current (DC-DC) converters increase their power density, their inductors require a planar structure with good heat dissipation. Planar inductors use rectangular wires or substrate patterns for their windings. Winding structures can be stacked, in which the structures are on top of each other; spiral, in which the windings are configured in the same plane; or composite structures of both. Here, the authors clarify the alternating-current (AC) resistance of inductors with different winding structures and propose a magnetic sealing technique (MST) that reduces the AC resistance of low-profile spiral inductors. Magnetic field simulation revealed the effect of MST on the AC resistance and inductance. Furthermore, spiral inductors with MST were fabricated, and the AC resistance reduction effect of MST was confirmed with impedance analyzer. The heat-generation reduction effect in an MST inductor was demonstrated in a 1-MHz 100 V/320 V 800-W boost DC-DC converter prototype with GaN devices.

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Section: Magnetic Field Simulation Of Planar Inductorsmentioning

confidence: 99%

Reduction of Alternating‐Current Resistance and Heat Generation of Spiral Inductors with Magnetic Sealing Technique

Shimura

Kanaya

Kobayashi

et al. 2023

IEEJ Transactions Elec Engng

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“…Therefore, a specific frequency exists to realize the minimum device size. This frequency is dependent on the input/output power conditions, but it is expected to increase with the improvement in the structures and materials of the passive components [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

2 kW Dual-Output Isolated DC/DC Converter Based on Current Doubler and Step-Down Chopper

Matsushita

Noguchi

Taguchi

et al. 2020

WEVJ

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In the context of the auxiliary power for motor-driven vehicles having two systems, we propose a new topology for a dual-output isolated DC/DC converter, which offers advantages in terms of efficiency and size. The proposed circuit consists of an H-bridge inverter, a transformer, and an integrated circuit of a current doubler and step-down chopper. Considering the high power and high frequency, our objective was to evaluate and identify the issues of an actual device with a power output of 2 kW and switching frequency of 400 kHz. The circuit feasibility was examined through measurements of the prototype, and both the voltage target response and load disturbance response characteristics were confirmed to operate as designed. The maximum and minimum efficiencies of this circuit were 81.3 and 61.5%, respectively, demonstrating that the load loss of the step-down chopper had a significant impact on the efficiency. The loss analysis revealed that the loss at the integrated circuit on the secondary side accounted for more than 50% of the total loss. Moreover, issues such as the behavior at power-on, efficiency, and size were identified and evaluated, thereby achieving the objectives of the study.

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Magnetic Spectra of Soft Magnetic Composites Based on Fe-Si-Cr-B Amorphous and Carbonyl-Iron Powders

Meng

Yang

et al. 2019

J Supercond Nov Magn

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Novel Method for Making Surface Insulation Layer on Fe-Based Amorphous Alloy Powder by Surface-Modification Using Two-Step Acid Solution Processing

Cited by 9 publications

References 7 publications

Reduction of Alternating‐Current Resistance and Heat Generation of Spiral Inductors with Magnetic Sealing Technique

Reduction of Alternating‐Current Resistance and Heat Generation of Spiral Inductors with Magnetic Sealing Technique

2 kW Dual-Output Isolated DC/DC Converter Based on Current Doubler and Step-Down Chopper

Magnetic Spectra of Soft Magnetic Composites Based on Fe-Si-Cr-B Amorphous and Carbonyl-Iron Powders

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