Characterization of coreless printed circuit board (PCB) transformers

Tang, Sheng; Hui, S. Y. Ron; Chung, Henry Shu-Hung

doi:10.1109/63.892842

Cited by 55 publications

(8 citation statements)

References 18 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: 84%

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: 84%

A Survey on Microtransformers

Nascimento

Telles

Joanni

et al. 2021

JICS

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“…Power electronics designers can chose between two families of modelling approach for planar transformers. The first one is based on a full analytical formalism as described in [19–30]. The main advantage is to have a small computation time is this case.…”

Section: Modelling and Optimisation Processmentioning

confidence: 99%

Optimisation and characterisation of a planar transformer with a high voltage ratio and high output voltage for plasma reactors

Lefranc

Odic

Kirkpatrick

2015

IET Power Electronics

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International audienceThis study presents a new design of a planar transformer for dielectric barrier discharge (DBD). The requirements for such designs are mainly a high voltage ratio, a high voltage value at the secondary side, a specific shape for industrial applications (planar shape in this case), a low volume and a high dv/dt value at the secondary side for capacitive loads. So as to propose an efficient design tool to power electronics designers, the authors propose a virtual prototyping methodology based on an optimisation algorithm and a finite element simulation software. Towards this case study, power electronics designers can use this methodology (bi-objective optimisation algorithm) to treat new designs and especially for very innovative power converters for DBD reactors. The first objective is to pre-size the planar transformer (geometrical variables). Virtual solutions are proposed on a Pareto front: the power designer can chose the best one according to specific contexts (cost, shape, volume, efficiency etc.). In a second step, the authors propose experimental results and highlight the voltage probes modelling that must be taken into account in the case of very fast transient waveforms especially for capacitive loads such as DBD reactors

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“…Coreless inductors pave the way to fully integrated power converters [3]. Understanding of the coreless PCB transformer theory [4] [5], optimal operation [6] and applications [7] helps eliminate previous misunderstandings that coreless PCB transformer might have unacceptable low magnetic coupling, low voltage gain and high EMI radiation problems. Specifically, a resonant technique has been incorporated into the use of the coreless PCB transformers so as to achieve a high voltage gain (to overcome the apparent low magnetic coupling) and take advantage of the leakage inductance (to turn the apparent disadvantage into an advantage) [8] [9].…”

Section: Introductionmentioning

confidence: 98%

Relationship of quality factor and hollow winding structure of Coreless Printed Spiral Winding (CPSW) inductor

Liu

Lee

et al. 2010

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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The principle of using hollow spiral winding is not novel, but the study on this topic is far from complete. In this paper, how hollow the central region of the Coreless Printed Spiral Winding (CPSW) inductor should be in order to achieve the maximal quality factor value Q max is explored. A new parameter, namely the ratio of the inner hollow radius and the outer winding radius τ = R in / R out , is proposed as an indicator for optimization and used to quantify how hollow a spiral winding is. With the aid of Finite Element Analysis (FEA), the relationship between τ and Q max , which depends on the operating frequency and the dimensional parameters of CPSW inductor, is established. For a specific operating frequency, it is discovered that if the conductor width is comparable with the skin depth, or the conductors are placed relatively far away from each others, the hollow design of the CPSW inductor has little improvement on Q but reduces the inductance. On the contrary, if the conductor width is much larger than the skin depth and the conductors are placed relatively close, the hollow spiral design is recommended. The optimal range of τ with which the Q max can be achieved is found to be around 0.45 to 0.55.

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Characterization of coreless printed circuit board (PCB) transformers

Cited by 55 publications

References 18 publications

A Survey on Microtransformers

A Survey on Microtransformers

Optimisation and characterisation of a planar transformer with a high voltage ratio and high output voltage for plasma reactors

Relationship of quality factor and hollow winding structure of Coreless Printed Spiral Winding (CPSW) inductor

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