Genetic algorithm based geometry optimization of inductively coupled printed spiral coils for remote powering of electronic implantable devices

Mehri, Sondos; Slama, Jaleleddine Ben Hadj; Ammari, Ahmed Chiheb; Rmili, Hatem

doi:10.1109/gscit.2014.6970124

Cited by 9 publications

(8 citation statements)

References 12 publications

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“…with μ = μ r . μ 0 (25) where μ 0 = 4π × 10 −9 H/cm is the permeability of space, and μ r is the relative permeability of the material.…”

Section: Resistance Calculationmentioning

confidence: 99%

“…Power transfer efficiency to medical devices implant by inductive coupling link allows reducing the size of the transmitter power generated by external circuit [19]. The coupling coefficient k and the quality factor of the inductors are important parameters for calculated and maximize the power transfer efficiency of the implantable devices [25]. The qualities factors Q T and Q R of the coils related to the parasitic resistance and the inductance of the coils, can be calculated by (26): (26) where w 0 = 2πf 0 is the angular frequency of resonance.…”

Section: Quality Factor and Link Efficiencymentioning

confidence: 99%

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Design and Optimization of Inductively Coupled Spiral Square Coils for Bio-Implantable Micro-System Device

Lakhdari¹,

Mekkakia-Maaza²,

Dekmous³

2019

IJECE

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Due to the development of biomedical microsystems technologies, the use of wireless power transfer systems in biomedical application has become very largely used for powering the implanted devices. The wireless power transfer by inductive resonance coupling link, is a technic for powering implantable medical devices<strong> </strong>(IMDs) between the external and implanted circuits. In this paper we describe the design of an inductive resonance coupling link using for powering small bio-implanted devices such as implantable bio-microsystem, peacemaker and cochlear implants. We present the reduced design and an optimization of small size obtained spiral coils of a 9.5 mm<sup>2</sup> implantable device with an operating frequency of 13.56 MHz according to the industrial scientific-medical (ISM). The model of the inductive coupling link based on spiral square coils design is developed using the theoretical analysis and optimization geometry of an inductive link. For a mutual distance between the two coils at 10mm, the power transfer efficiency is about 79% with , coupling coefficient of 0.075 and a mutual inductance value of 2µH. In comparison with previous works, the results obtained in this work showed better performance such as the weak inter coils distance, the hight efficiency power transfer and geometry.

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“…with μ = μ r . μ 0 (25) where μ 0 = 4π × 10 −9 H/cm is the permeability of space, and μ r is the relative permeability of the material.…”

Section: Resistance Calculationmentioning

confidence: 99%

Section: Quality Factor and Link Efficiencymentioning

confidence: 99%

Design and Optimization of Inductively Coupled Spiral Square Coils for Bio-Implantable Micro-System Device

Lakhdari¹,

Mekkakia-Maaza²,

Dekmous³

2019

IJECE

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“…The maximal inductive link efficiency is guaranteed when resonance and optimal load conditions are verified [13], [14], [15]. The maximal efficiency is expressed as: (6) with Q 1 , Q 2 are the quality factors of unloaded primary and secondary coils respectively, k is the coupling factor which is the ratio of shared magnetic field to the total magnetic field between transmitting and receiving coils.…”

Section: Inductive Link Efficiencymentioning

confidence: 99%

Performance characterization of variable width square coils for inductive link wireless power transfer

Mehri

Ammari

Slama

et al. 2016

2016 18th Mediterranean Electrotechnical Conference (MELECON)

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Supplying power to electronic medical implants (EMI) by inductive coupling has always been appreciated for its biocompatibility and its ability to transmit sufficient power to the implants. Although this method was introduced a long time ago, several challenges remain. The major challenge is the sensitivity of the link to coupling and quality factor variations which are strongly dependent on the separation distance and lateral displacements between receiving and issuing coils. In this context and in order to increase the coils' quality factor and to improve the system robustness to coupling factor variations, a new variable width square coil models are proposed and compared with conventional inductive link structures. Walking through experimental validations, this paper shows that employing variable width single layer coil, the quality factor and inductance of the coils are enhanced by 3.4 % and 8.2 % respectively in comparison with standard uniform with coil. Lateral misalignment robustness investigations confirms that, compared with single layer coils, an inductive link composed of double layer square coils is 120 % and 45% less sensitive to lateral misalignments according respectively to x and y axis.Keyword: inductive link efficiency, variable width coil, double layer coil, laterals misalignments.

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“…Conclusions are drawn in the last section. At low frequency, the analytical equation characterizing coils' quality factor is defined as [3]:…”

Section: Introductionmentioning

confidence: 99%

Minimizing printed spiral coil losses for inductive link wireless power transfer

Mehri

Ammari

Slama

2016

2016 IEEE Wireless Power Transfer Conference (WPTC)

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This work aims for the design of printed spiral coils (PSC) with high quality factors. This consists in minimizing coil losses represented by proximity and eddy currents losses. For this purpose, specific geometric parameters characterizing spiral coils are shown to have a direct impact on increasing such losses. As a result, to minimize proximity effect, high ratios between the interspace separating two adjacent traces and the trace width are recommended to be used. In addition, to reduce eddy current losses, an empirical equation is developed to determine the optimal inner diameter sizes of the coils. The obtained numerical results confirmed that, using the proposed design constraints, the quality factor of the coils improves by 40 % in average with only 12 % decrease of the coil inductance value. Analytical formulation of the coil quality factor is obtained. Comparing analytical to simulation results, the obtained errors are reduced from 43 % to only 5 % when the recommended design constraints are applied.

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Genetic algorithm based geometry optimization of inductively coupled printed spiral coils for remote powering of electronic implantable devices

Cited by 9 publications

References 12 publications

Design and Optimization of Inductively Coupled Spiral Square Coils for Bio-Implantable Micro-System Device

Design and Optimization of Inductively Coupled Spiral Square Coils for Bio-Implantable Micro-System Device

Performance characterization of variable width square coils for inductive link wireless power transfer

Minimizing printed spiral coil losses for inductive link wireless power transfer

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