Fabrication and characterization of a solenoid-type microtransformer

Rassel, R.; Hiatt, C.F.; DeCramer, J.; Campbell, S.A.

doi:10.1109/tmag.2002.806341

Cited by 16 publications

(10 citation statements)

References 13 publications

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“…This variation in the operating frequency range affects in making a straight comparison tremendously. The inductance reported by Yunas et al (2008), Rassel et al (2003), Lu et al (2008), Moazenzadeh et al (2012), Raimann et al (2012), Wang et al (2007), Meyer et al (2010), Mino et al (1992) and Xu et al (1998) are 35, 100, 100, 199, 370, 372, 400, 500 and 800 nH, respectively. While in this fabricated work the values achieved for the inductance were 90 and 164 µH for the 10 and 18 turns, respectively.…”

Section: Discussionmentioning

confidence: 89%

Design and Fabrication of a MEMS 3D Micro-transformer for Low Frequency Applications

Ahmed¹,

Bhuyan²,

Islam³

et al. 2015

Asian J. of Scientific Research

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This study presents the fabrication of a 3D micro-transformer using MEMS technology in 10-600 kHz frequency range. The fabrication processes is developed for high-performance and low-cost realization with respect to planner design. The coil winding and the magnetic cores were fabricated by electro-deposition using copper and Ni/Fe Permalloy materials, respectively. In step-up configuration, the micro-transformer achieved 73.75% efficiency. The inductance achieved was 90 and 164 µH for primary and secondary coils, respectively. Characterization results and fabrication process of the fabricated transformer (2560×1240 µm) on alumina ceramic substrate are presented.

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Section: Discussionmentioning

confidence: 89%

Design and Fabrication of a MEMS 3D Micro-transformer for Low Frequency Applications

Ahmed¹,

Bhuyan²,

Islam³

et al. 2015

Asian J. of Scientific Research

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“…The term "racetrack geometry" refers to microtransformers in which the core or the coils are in a shape resembling a racetrack. Any of the possible microtransformer structures (coplanar, multilayer or solenoid) can be made with this geometry [15], [26], [29], [30], [43], [52], [53], [61]- [63], [66], [70]- [84]. In general, the inductance values achieved using this geometry can vary greatly, due to the different parameters involved (structure, dimensions and core used).…”

Section: Racetrackmentioning

confidence: 99%

A Survey on Microtransformers

Nascimento

Telles

Joanni

et al. 2021

JICS

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The miniaturization of magnetic devices is a subject of enduring interest, since inductors and transformers of very small dimensions are constantly being required for integration into microchips and electrical circuit boards. The main objective of this survey is to supply a compilation of the published research on microtransformers, and to work as a support material, helping in the choice of the most appropriate technology and device configuration for a particular application. The text describes the historical development of microtransformers, the structures in which these devices might be assembled, the various proposed geometries, the fabrication processes, and the type of core used. A brief discussion of equivalent circuit modeling is presented. The current state of the technology in relation to commercial devices is then examined, pointing out some unsolved problems that warrant further studies.

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“…The scattering parameters of the microtransformers were recorded simultaneously as a function of a logarithmic frequency sweep from 300 kHz up to 300 MHz as a S2P file. The power efficiency η of the microtransformers, defined as the output load power versus the input power, was computed directly from the scattering parameters Sxy, using equation (6), where x and y denote the port numbers [54]: …”

Section: B Ut Core Microtransformer Electrical Performancementioning

confidence: 99%

3-D Microtransformers for DC–DC On-Chip Power Conversion

Moazenzadeh

Sandoval

Spengler

et al. 2015

IEEE Trans. Power Electron.

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We address the miniaturization of power converters by introducing novel, 3D microtransformers with magnetic core for low-MHz frequency applications. The core is fabricated by lamination and microstructuring of Metglas ® 2714A magnetic alloy. The solenoids of the microtransformers are wound around the core using a ball-wedge wirebonder. The wirebonding process is fast, allowing the fabrication of solenoids with up to 40 turns in 10 s. The fabricated devices yield the high inductance per unit volume of 2.95 µH/mm 3 and energy per unit volume of 133 nJ/mm 3 at the frequency of 1 MHz. The power efficiency of 64-76% are measured for different turns ratio with coupling factors as high as 98%.To demonstrate the applicability of our passive components two PWM controllers were selected to implement an isolated and a nonisolated switch mode power supply. The isolated converter operates with overall efficiency of 55% and maximum output power of 136 mW, then we experimentally demonstrate how we increased this efficiency to 71% and output power to 408 mW. The non-isolated converter can deliver an overall efficiency of 81% with a maximum output power of 515 mW. Finally, we benchmarked the results to underline the potential of the technology for power on-chip applications.Index Terms-Transformer, Magnetic layered film, DC-DC power conversion, Micromachining.

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Fabrication and characterization of a solenoid-type microtransformer

Cited by 16 publications

References 13 publications

Design and Fabrication of a MEMS 3D Micro-transformer for Low Frequency Applications

Design and Fabrication of a MEMS 3D Micro-transformer for Low Frequency Applications

A Survey on Microtransformers

3-D Microtransformers for DC–DC On-Chip Power Conversion

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