Application of Windings Shifting for the Optimization of Planar Structures

Hebedean, Claudia; Munteanu, Călin; Racasan, Adina; Pacurar, Claudia

doi:10.30638/eemj.2013.142

Cited by 7 publications

(3 citation statements)

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“…It was concluded that the thickness of the dielectric influences the losses in the conductors. [9] The increase of its thickness not only decreases the losses, as it can be observed in the graph from Fig. 7, but also decreases the value of parasitic capacitances, as it was stated in previous research [5], which will lead to a better functionality of the device.…”

Section: B Influence Of the Dielectric Thickness On The Conductor Lomentioning

confidence: 63%

“…(The glass used in laminates has a relative dielectric constant of 6.0.) [9] The woven glass reinforced materials have relative permittivities between 3.9 and 4.4, while for the non-woven materials the values are higher. The studied materials along with their characteristics are presented in Table 1.…”

Section: Influence Of Different Types Of Dielectrics On the Lossesmentioning

confidence: 97%

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Analysis of the influence of parasitic parameters on planar transformers

Hebedean

Munteanu

Racasan

et al. 2014

2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

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The use of planar transformers has increased in the last few years due to their efficiency in high frequency switching-mode power supplies (SMPS). Like all other devices constructed in planar technology, they have a lot of advantages like repeatability of elements, decreased dimensions and weight and high switching frequency, but there are some disadvantages too. In order to improve them one must know that the parasitic elements which must be suppressed are the parasitic capacitances between the windings, the leakage inductance and the losses. This paper analyzes the parasitic parameters of planar transformers, aiming to optimize them by the minimization of the losses and parasitic capacitances.

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Section: B Influence Of the Dielectric Thickness On The Conductor Lomentioning

confidence: 63%

Section: Influence Of Different Types Of Dielectrics On the Lossesmentioning

confidence: 97%

Analysis of the influence of parasitic parameters on planar transformers

Hebedean

Munteanu

Racasan

et al. 2014

2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

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“…where the vector dl represents the differential element of the coil, the vector r is the distance from the coil element to the field point, and N is the number of turns of the coil. For coils of non-traditional shapes (Păcurar et al, 2013;Hebedean et al, 2013), one can compute A using an approximation method in which the contour of the coil is first divided into a variable number of equal segments, and the magnetic vector potential in the calculus point is obtained by adding the contribution of each segment to the final value.…”

Section: Main Section Mechanism Of Magnetic Stimulationmentioning

confidence: 99%

Improved coil design for repetitive magnetic stimulation of the spinal cord

Cretu

Micu

2015

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose – The purpose of this paper is to evaluate the response of the spinal cord, the transmembrane potential, during lumbar magnetic stimulation, using a figure of eight coil. Design/methodology/approach – In order to obtain a precise stimulation of the spinal cord and not the nearby nervous fibres, the coil from the electric circuit of the magnetic stimulator is optimized. The new proposed design is based on the turns’ placement inside the coil, the number of turns required to produce activation. Once the coil configuration is established, the paper addresses other issues that need to be solved: reducing power consumption (the low efficiency of power transfer from the coil to the tissue is a major drawback) and reducing coil heating. Findings – The traditional commercial coils, used for magnetic stimulation in some preliminary experiments, had proved their inability to specifically stimulate the target tissue, without activating the surrounding areas and the low efficiency of power transfer from the coil to the nervous tissue. A more realistic modelling of the stimulating coil, based on the distribution of turns inside the coil can lead to directly stimulation of the spinal cord, during lumbar magnetic stimulation. Practical implications – If the electrical circuit of the magnetic stimulator is improved, the direct stimulation of the spinal cord is obtained; so, this technique could facilitate functional motor activities, including standing and stepping in paralyzed people, without requiring implantation of electrodes like in electrical stimulation. Originality/value – The authors underlined that the spinal cord stimulation can be achieved by magnetic stimulation, only if the parameters of the stimulator circuit are optimized. Therefore an original and realistic modelling of the inductive coil was proposed based on number and turns’ distribution within the coil. The coil is designed so that reducing the excessive heating makes it difficult in obtaining a more frequent repetition of stimulus.

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