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WIREFREE

Tailored WIREless power transFeR Systems for mobile Electronic Equipments
Funder: French National Research Agency (ANR)Project code: ANR-14-CE26-0030
Funder Contribution: 188,552 EUR

WIREFREE

Description

Wireless power transfer (WPT) systems are electromagnetic devices able to transfer wirelessly energy over the distance. The current implementation of WPT systems is generally based on magnetic resonators interacting within each other’s reactive near-field zones. These systems respond to the widespread proliferation of portable rechargeable electronic devices and current limitations of battery charges and wire-based distribution networks. The social impact will be important since WPT systems are seen as the last frontier for the complete mobility of people. The revenue of the wireless power industry market is estimated to $1 billion with a very strong increasing rate in the coming years. The main research effort on WPT systems is registered in USA. The WPT system proposed by the Massachusetts Institute of Technology (MIT, USA) is still the state of the art for WPT systems. It presents a power efficiency of 40% over 2 m distance. During the years, new adaptive networks or cumbersome relay systems have been proposed to improve the performances of such system. No attempt as be done to date to define and investigate new operation schemes. For the first time here, we propose to tailor the near-field of WPT systems (tailored WPT systems) to improve both the power efficiency and distance range and go much beyond the current state of the art. The innovative idea is to tailor the near field of the system to reduce the decay ratio of the magnetic field over the distance without radiating in free space. Indeed we are aiming to design super slowly-evanescent localized fields. The radiation resistance is kept small as for current systems, but the tails of the near field are enhanced by properly loading the structure. In other words, the equivalent impedance supporting the required near field is created on the aperture of the system. The system can be also electrically larger without radiating thanks to the imposed small radiation resistance. In this way the available space of domestic or industrial environment may be used to enhance the performances of the system by using larger transmitting systems. The overall system will be analyzed with an in-house code able to define an electromagnetic device from a given near-field profile. The developed code will be unique for the present state of the art of simulator tools. The proposed WPT systems may open new opportunities and possible technology transfers for many daily life applications. WIREFREE is a 36-month JCJC (Jeunes Chercheurs - Jeunes Chercheuses) ANR project coordinated by IETR.

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