Hysteresis modelling of high-frequency micro-transformers

Wang, N.; O’Donnell, Terence; Hauser, H.; McCloskey, Paul; O’Mathuna, S.C.

doi:10.1016/j.jmmm.2004.01.013

Cited by 12 publications

(5 citation statements)

References 2 publications

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“…Publications reporting the development of microtransformers for communications are about 34% of the works analyzed [6], [16]- [19], [21], [23], [28], [32], [34]- [39], [48], [49], [51], [52], [55], [60], [61], [63], [68], [74], [75], [82], [83], [95], [103], [107], [110], [121]- [123], [136]. This includes applications like UHF and VHF circuits and microwave monolithic integrated circuits.…”

Section: B Communicationsmentioning

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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Section: B Communicationsmentioning

confidence: 99%

A Survey on Microtransformers

Nascimento

Telles

Joanni

et al. 2021

JICS

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“…They are able to work from a few MHz to several hundred MHz [15], [16]. Mino et al [17] manufactured a microtransformer used in a low-power forward converter that can operate up to 32 MHz.…”

Section: Introductionmentioning

confidence: 99%

Design and Study of Interleaved and Face to Face Magnetic Microtransformers

Youssouf

Kahlouche

Soultan

et al. 2014

IEEE Trans. Electron Devices

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The aim of this paper is to compare two types of microtransformers using the High Frequency Structural Simulation simulator. Interleaved and face to face transformers were studied for applications in dc/dc converters and variable speed drive. These transformers have a magnetic material core (yttrium iron garnet) and square spiral windings. The main purpose of the use of magnetic material is to increase the magnetizing inductance L F and the coupling factor k. For this, L F and k were studied by simulation as a function of turn spacing, magnetic, and insulating layer thicknesses. The results presented were compared with recently published works. An important improvement of the main properties was observed in the frequency range (10-100 MHz). The interleaved transformer properties are equal to 0.95 and 0.80 µH for k and L F parameters, which corresponds to an 0.05 µH/mm 2 inductance area ratio (L F / A), whereas for the face to face transformer k and L F are equal to 0.9 and 0.78 µH for an 0.08 µH/mm 2 inductance area ratio. Interleaved transformers were manufactured and characterized. Results show close agreement between simulation and measurement results.Index Terms-Coupling factor, face to face transformer, interleaved transformer, magnetic material.

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“…Authors use a particular spiral design, racetrack shape, in this work since it is easy to induce uniaxial anisotropy in the core in order to achieve a good frequency response. In previous work [10][11][12][13][14], the authors presented the modeling, design, and test of micro-transformer with relatively large footprint area, e.g. 10s mm2, aimed for 5MHz switching frequency.…”

Section: Introductionmentioning

confidence: 99%

“…The measured results on device prototypes are compared to modeled characteristics. Using the validated model introduced previously [12][13], a design optimization study was undertaken to investigate the impact of using new micro-transformer structures on the efficiency of a micro-transformer operating in a 20MHz converter. Three key parameters varied were (a) device footprint area (b) conductor width (c) moving from single metal layer (SLM) structure to double layer metal (DLM) structure in the analytical model for maximizing the efficiency.…”

Section: Introductionmentioning

confidence: 99%

High efficiency Si integrated micro-transformers using stacked copper windings for power conversion applications

Wang

Kulkarni

Jamieson

et al. 2012

2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper details the design, fabrication, and characterization of silicon integrated micro-transformers. Two types of race-track shaped micro-transformers, single copper winding or single layer metal (SLM) and double copper winding or double layer metal (DLM) were designed and fabricated using standard CMOS processing. The DLM devices have higher inductance density than SLM devices realized within similar footprint area. The design study showed that the efficiency of micro-transformers increased from 37% for SLM designs to over 75% for DLM transformers at 20 MHz.

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Hysteresis modelling of high-frequency micro-transformers

Cited by 12 publications

References 2 publications

A Survey on Microtransformers

A Survey on Microtransformers

Design and Study of Interleaved and Face to Face Magnetic Microtransformers

High efficiency Si integrated micro-transformers using stacked copper windings for power conversion applications

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