Thin film transformer and its analysis by integral equation method

Marinova, Iliana; Midorikawa, Yoichi; Hayano, S.; Saito, Yoshifuru

doi:10.1109/20.390153

Cited by 17 publications

(6 citation statements)

References 15 publications

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“…This area has been mentioned in almost 40% of the papers analyzed in this work [15], [22], [24], [31], [39], [40], [42]- [47], [50], [52], [54], [58], [59], [62], [66], [67], [70]- [73], [79]- [81], [84]- [91], [93]- [99], [101], [105], [116], [120]- [122], [131]- [134]. Some of the examples of specific applications in this area are DC-DC converters, energy harvesting, and power systems on chip.…”

Section: A Energy Conversionmentioning

confidence: 86%

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: A Energy Conversionmentioning

confidence: 86%

A Survey on Microtransformers

Nascimento

Telles

Joanni

et al. 2021

JICS

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“…The primary and secondary windings are fabricated using the two copper layers of a double-layer PCB [ 58 , 59 , 60 , 61 , 62 , 63 ], although there are developments using multiple layers (four layers) PCBs [ 56 , 64 ]. In the first case, the FR4 layer offers an electrical isolation ranging between 15 and 40 kV.…”

Section: Printed Circuit Boards For Electronics Sensors and Actuatorsmentioning

confidence: 99%

Printed Circuit Boards: The Layers’ Functions for Electronic and Biomedical Engineering

Perdigones

Quero

2022

Micromachines

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This paper describes the fabrication opportunities that Printed Circuit Boards (PCBs) offer for electronic and biomedical engineering. Historically, PCB substrates have been used to support the components of the electronic devices, linking them using copper lines, and providing input and output pads to connect the rest of the system. In addition, this kind of substrate is an emerging material for biomedical engineering thanks to its many interesting characteristics, such as its commercial availability at a low cost with very good tolerance and versatility, due to its multilayer characteristics; that is, the possibility of using several metals and substrate layers. The alternative uses of copper, gold, Flame Retardant 4 (FR4) and silver layers, together with the use of vias, solder masks and a rigid and flexible substrate, are noted. Among other uses, these characteristics have been using to develop many sensors, biosensors and actuators, and PCB-based lab-on chips; for example, deoxyribonucleic acid (DNA) amplification devices for Polymerase Chain Reaction (PCR). In addition, several applications of these devices are going to be noted in this paper, and two tables summarizing the layers’ functions are included in the discussion: the first one for metallic layers, and the second one for the vias, solder mask, flexible and rigid substrate functions.

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“…In addition, it may not be easy to manufacture identical twisted coil transformer in large quantity with high quality control. On another research front, much research effort has been focused on the use of printed planar windings for inductor or transformers [2]- [10]. The use of printed planar windings not only eliminates the costly manual winding process in traditional transformers but, more importantly, makes it possible to manufacture inductors or transformers with precise parameters in an automated manner.…”

Section: Introductionmentioning

confidence: 99%

“…In most of the literature [2]- [9], magnetic substrates or materials are still used as parts of the magnetic core structures. An interesting attempt of printing two spiral windings on the same surface of a PCB without using magnetic core is reported in [10]. In [10], an integral equation analysis method for predicting the parameters of the printed single-sided PCB transformer is presented.…”

Section: Introductionmentioning

confidence: 99%

“…0885-8993/00$10.00 © 2000 IEEE In most of the literature mentioned above, the planar inductors and transformers are of low output power (typically less than 2 W). Except in [1], [10], the magnetic designs require the use of magnetic cores in one form or another. Additionally the apparent problems of coreless planar PCB transformers, namely low coupling factor and high leakage inductance, have not been solved.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coreless planar printed-circuit-board (PCB) transformers-a fundamental concept for signal and energy transfer

Tang

Hui

Chung

2000

IEEE Trans. Power Electron.

109

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Magnetic cores have been used in transformers for over a century. In this paper, the authors present a fundamental concept of using "coreless" printed-circuit-board (PCB) transformers. With the aid of a high-frequency equivalent circuit, the use and basic characteristics of coreless PCB transformers are described. Optimal operating conditions for minimum input power requirement and maximum efficiency operations are identified. Coreless PCB transformers have the advantages of low costs, very high power density, no limitation due to magnetic cores, no magnetic loss and ease of manufacturing. They have the potential to be developed in microcircuits. A printed planar PCB transformer with a diameter of about 1.0 cm and power capability of 19W has been successfully tested. The power density of the PCB transformer demonstrated in this paper is 24 W/cm 2. The maximum efficiency can be greater than 90%. The analysis has been confirmed with experiments. Coreless printed transformers have great potential in applications in which stringent height and space requirements have to be met. Index Terms-Coreless printed circuit board transformer, high frequency magnetics, microcircuits, passive components, power conversion.

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Thin film transformer and its analysis by integral equation method

Cited by 17 publications

References 15 publications

A Survey on Microtransformers

A Survey on Microtransformers

Printed Circuit Boards: The Layers’ Functions for Electronic and Biomedical Engineering

Coreless planar printed-circuit-board (PCB) transformers-a fundamental concept for signal and energy transfer

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