Analysis of the Coupling Effect in Different Meander-Type Winding Planar Transformers

Djuric, Snezana; Stojanović, Goran; Damnjanović, Mirjana

doi:10.1109/tmag.2013.2243417

Cited by 8 publications

(10 citation statements)

References 11 publications

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“…The same ferrite cores as in [8], Ferroxcube E43/10/28 3F3, were used, yet the winding arrangement is different. The winding arrangement is similar to design 3 analyzed in [9]. In this winding configuration, two meander turns in each winding are separated in xy plane thus avoiding the effect stacking the winding halves when the magnetic flux density is much higher between the winding halves than outside the winding halves, thus decreasing the winding inductance.…”

Section: Design Of a Compact Planar Transformermentioning

confidence: 99%

“…The current in two layers of the winding was in opposite direction, hence the field vectors in the two layers counteracted each other, thus decreasing the inductance of the winding. As to surpass these shortcomings, simplified transformer topologies with three different windings arrangements were analyzed in [9]. Results of the analysis showed which winding arrangement was most suitable for transformer topology in [8] and possible could improve its efficiency.…”

Section: Introductionmentioning

confidence: 99%

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A Compact Planar Transformer With an Improved Winding Configuration

Djuric

Stojanović

2014

IEEE Trans. Magn.

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A compact planar transformer with an improved winding configuration has been designed and fabricated. Meander-type design was engraved over the surface of a planar ferrite core, so that the primary and secondary windings can fit into the engraved design. The planar core, with the primary and secondary windings fit into it, was covered with another ferrite core, thus forming a compact planar transformer. Apical type AV polyimide film of 0.025 mm thickness is used between the windings to prevent short circuit. A coupling coefficient of >0.93 was achieved, while the primary and secondary inductance was ∼1600 nH. A coupling coefficient for air core transformer with the windings of identical geometry was >0.35 and the inductance of the windings near 160 nH. Fabricated transformer prototype has significantly higher coupling coefficient and inductance of the windings in comparison with the previously developed planar transformer of the similar design.

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Section: Design Of a Compact Planar Transformermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Compact Planar Transformer With an Improved Winding Configuration

Djuric

Stojanović

2014

IEEE Trans. Magn.

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“…These transformers are constructed by sandwiching layers of conductors, dielectrics and magnetic materials together [3]. The advantages of planar transformers are that the planar nature of the windings allow for more complex and efficient winding configurations, and also allows for excellent repeatability in manufacturing due to well defined geometry [4][5][6]. This characteristic allows parasitics to be intelligently controlled such that they have the least effect on the performance of the transformer.…”

Section: Introductionmentioning

confidence: 99%

“…Many authors [5,9,[13][14][15] cite these characteristics as main reasons to use planar transformers in switched-mode power supplies; the same has allowed authors to develop planar transformers for applications in aerospace [16] and consumer electronics [15,17,18].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Dielectric Thickness on the Power Bandwidth of Planar Transformers

Vallabhapurapu¹,

Hofsajer²

2018

PIER C

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Abstract-This paper considers an ideal planar transformer wherein only the electromagnetic parasitics (stray capacitive and leakage inductance) arising out of the transformer geometry are taken into account, assuming lossless conditions. A suitable electrically equivalent circuit model for the planar transformer is used to analyze its frequency and power transfer characteristics; this model was validated by a three dimensional electromagnetic simulation of the planar transformer structure in FEKO electromagnetic simulation software. The effect of dielectric thickness on the bandwidth of the transformer has been analyzed based on the premise that the inherent stray capacitance and leakage inductance elements would affect the power transfer characteristics of the transformer. It has been found that the dielectric thickness of a planar transformer can be optimized so as to maximize the frequency bandwidth. It is also shown that the bandwidth is found to be sensitive to the thickness of the dielectric beyond the optimum thickness threshold t opt . Convenient closed form analytic expressions for the optimum dielectric thickness and the resultant maximum bandwidth are derived and presented. It is argued that these results can be readily used to benefit the design of air-core PCB/Planar transformers.

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“…The coupling coefficient [17,18] determines the amount of magnetic flux transferred from transmitter to receiver coil. It depends severely on materials and geometry of ferrite cores.…”

Section: Introductionmentioning

confidence: 99%

Optimization, design, and modeling of ferrite core geometry for inductive wireless power transfer

Strauch

Pavlin

Bregar

2015

International Journal of Applied Electromagnetics and Mechanics

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Abstract. This paper presents a new design of ferrite core made of ferrite bars positioned in radial geometry. New core design is used in inductive wireless power transfer where the optimal design of ferrite bars was analyzed. Numerical simulations of seven ferrite bars geometries were performed in 3D models using Comsol Multiphysics in terms of the coupling coefficient. Two optimal designs of three and nine ferrite bars geometries were used for parameterization of geometric parameters. Both simulations of three and nine ferrite bars geometries were verified by measurements. Optimal design of nine ferrite bars geometry is proposed for use in wireless power transfer because of low consumption of ferrite material.Ferrite bars geometry was also used as a magnetic shield to reduce magnetic fields which may interfere with the electronics nearby. Magnetic flux density in ferrite bars is low enough that prevents ferrite bars from the saturation. The angular alignment of optimal design of nine ferrite bars on the transmitter and receiver side was negligible as the difference in the coupling coefficient was 0.13%. Advantages of using optimal design of nine ferrite bars geometry are: high value of the coupling coefficient, low consumption of ferrite material, and reduced weight.

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Analysis of the Coupling Effect in Different Meander-Type Winding Planar Transformers

Cited by 8 publications

References 11 publications

A Compact Planar Transformer With an Improved Winding Configuration

A Compact Planar Transformer With an Improved Winding Configuration

The Influence of Dielectric Thickness on the Power Bandwidth of Planar Transformers

Optimization, design, and modeling of ferrite core geometry for inductive wireless power transfer

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