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Subject: search.filters.subject.Wireless power transfer

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    Optimal design of wireless power transfer coils for biomedical implants using machine learning and meta-heuristic algorithms
    (Springer Nature, 2024) Bennia, Fatima; Boudouda, Aimad; Nafa, Fares
    The classical methods for optimizing wireless power transfer (WPT) systems using mathematical equations or finite element methods can be time-consuming and may only sometimes yield optimal designs. In order to overcome this challenge, this paper introduces a novel approach integrating machine learning techniques with meta-heuristic methods to design and optimize a miniaturized, high-efficiency WPT receiving coil for biomedical applications. The objective is to achieve dimensions below 20 mm, a depth of 30 mm within the tissue, and a frequency of 13.56 MHz. Our approach leverages a neural network (NN) model to predict efficiency based on geometric coil parameters, eliminating the need for complex equations. The NN was trained on a dataset generated via finite element method simulations. We employ two meta-heuristic algorithms, the genetic algorithm and the coyote optimization method, to find optimal parameters that maximize efficiency. Our NN model demonstrates exceptional accuracy, exceeding 97%. Furthermore, the proposed WPT coil design approach enhances transfer efficiency by up to 76%, significantly reducing computation time compared to classical methods. Finally, we validate our results using finite element simulation with Ansys Maxwell 3D.
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    A Novel Design of a Microstrip Antenna Array for Wireless Power Transfer Applications
    (Springer, 2024) Dehmas, Mokrane; Challal, Mouloud; Arous, Abdelali; Haif, Hamza
    In this article, a new 1 × 4 microstrip antenna array operating at 2.45 GHz for wireless power transfer (WPT) applications is proposed. Besides the array configuration, and for maximum power transfer to the load, the performed design puts into contribution three other design techniques which are: defected ground structure, electromagnetic band gap and multilayer topology. The suggested antenna, printed on an FR-4 dielectric substrate, achieves significantly improved directivity and gain of 13.30 dBi and 10.90 dBi, respectively. Furthermore, an input reflection coefficient around − 38 dB, a frequency bandwidth of about 180 MHz and a side lobe level (SLL) below − 20 dB are obtained. It is also observed that the antenna gain is close to its maximum performance across the entire operating frequency band (2.36–2.54 GHz). A prototype of the performed design is fabricated and tested. Experimental results show a good agreement between simulated and measured input reflection coefficients. The achieved performances make the developed structure highly suitable for WPT systems.
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    Iterative method based optimization of wireless power transfer for biomedical implants
    (IEEE, 2023) Bennia, Fatima; Boudouda, Aimad; Nafaa, Fares
    Magnetic resonance coupling wireless power transfer (WPT) systems have gained increasing interest as an effective method for powering implantable medical devices (IMDs). Power transfer efficiency is a very important characteristic of WPT systems. It is characterized by the coupling and quality factors of the WPT coils. The maximum power transfer efficiency is obtained for high coupling and quality factors. It greatly depends on the geometrical parameters of the WPT coils. This paper presents an iterative procedure to design and optimize an implant coil restricted to a small size of 20mm at a distance of 30 mm, with an operating frequency of 13.56 MHz within the ISM frequency band. The proposed method aims to find the optimal geometrical parameters that maximize the power transfer efficiency. The designed coils give a high efficiency of about 83%. Finally, the finite element simulation with Ansys Maxwell 3D validates the obtained results
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    Multicoils-based inductive links dedicated to power up implantable medical devices: Modeling, design and experimental results
    (Springer Science, 2009) Sawan, Mohamad; Hashemi, Saeid; Sehil, Mohamed; Khouas, Abdelhakim
    We present in this paper a new topology of inductively-coupled links based on a monolithic multi-coils receiver. A model is built to characterize the proposed structure using Matlab and is verified employing simulation tools under ADS electromagnetic environment. This topology accounts for the losses associated with the receiver micro-coil including substrate and oxide layers. The geometry of micro-coils significantly desensitizes the link to both angular and side misalignments. A custom fabrication process using 1 micron metal thickness is also presented by which two sets of micro-coils varying in the number of coils are realized. The first set possesses one coil 4 mm of diameter and represents a power efficiency close to 4% while the second set possesses multi-coils with an efficiency of 18%. The resulting optimized link can deliver up to 50 mW of power to power up an implantable device either sensor or stimulator. The experimental results for the prototypes are remarkably in agreement with those obtained from simulated models and circuits