{"id":461317,"date":"2024-09-26T08:04:10","date_gmt":"2024-09-26T06:04:10","guid":{"rendered":"https:\/\/www.ecinews.fr\/?p=461317"},"modified":"2024-09-25T18:11:27","modified_gmt":"2024-09-25T16:11:27","slug":"le-cea-leti-booste-les-convertisseurs-cc-cc-piezoelectriques","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/le-cea-leti-booste-les-convertisseurs-cc-cc-piezoelectriques\/","title":{"rendered":"Le CEA-Leti booste les convertisseurs CC-CC pi\u00e9zo\u00e9lectriques"},"content":{"rendered":"<h3>Des chercheurs fran\u00e7ais ont mis au point une technique qui ouvre la voie \u00e0 l&rsquo;utilisation de convertisseurs pi\u00e9zo\u00e9lectriques dans les t\u00e9l\u00e9viseurs, les t\u00e9l\u00e9phones, les tablettes et les outils \u00e9lectriques.<\/h3>\n<p>Les chercheurs du CEA-Leti en France ont d\u00e9velopp\u00e9 un convertisseur DC-DC pour r\u00e9duire l&rsquo;oscillation de la tension pi\u00e9zo\u00e9lectrique et donc le courant circulant. Celui-ci est appliqu\u00e9 \u00e0 un convertisseur DC-DC isol\u00e9 \u00e0 double pont bas\u00e9 sur deux r\u00e9sonateurs pi\u00e9zo\u00e9lectriques (PR).<\/p>\n<p>Le principe est valid\u00e9 exp\u00e9rimentalement, montrant une am\u00e9lioration de l&rsquo;efficacit\u00e9 allant jusqu&rsquo;\u00e0 11 % et 5 % en moyenne pour l&rsquo;utilisation du mouvement m\u00e9canique pour produire de l&rsquo;\u00e9nergie. Pour une conversion de 200 V \u00e0 120 V, le convertisseur pr\u00e9sente un rendement de 96,2 % avec le circuit d&rsquo;assistance inductif, de 94,3 % avec le circuit pi\u00e9zo\u00e9lectrique et de 87,4 % sans aucun circuit d&rsquo;assistance. Le r\u00e9sonateur pi\u00e9zo\u00e9lectrique offre un gain d&rsquo;efficacit\u00e9 sur une plage de fonctionnement plus petite que l&rsquo;inductance, mais conduit \u00e0 un convertisseur plus plat.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"GorTTQC65H\"><p><a href=\"https:\/\/www.eenewseurope.com\/en\/leti-innovation-days-detail-europe-chip-strengths\/\">Leti Innovation Days detail Europe chip strengths<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content lazyload\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;Leti Innovation Days detail Europe chip strengths&#8221; &#8212; eeNews Europe\" data-src=\"https:\/\/www.eenewseurope.com\/en\/leti-innovation-days-detail-europe-chip-strengths\/embed\/#?secret=9qFNok42Hd#?secret=GorTTQC65H\" data-secret=\"GorTTQC65H\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" data-load-mode=\"1\"><\/iframe><\/p>\n<p>\u00ab\u00a0Pour beaucoup de gens, la pi\u00e9zo\u00e9lectricit\u00e9 est associ\u00e9e \u00e0 la collecte d&rsquo;\u00e9nergie et \u00e0 l&rsquo;id\u00e9e de faible puissance\u00a0\u00bb, explique le chercheur Ghislain Despesse. \u00ab\u00a0Mais dans la conversion d&rsquo;\u00e9nergie, les pi\u00e9zo\u00e9lectriques fonctionnent \u00e0 des fr\u00e9quences \u00e9lev\u00e9es, sup\u00e9rieures \u00e0 100 kHz, sans limites en termes de puissance d&rsquo;entr\u00e9e. Cela permet d&rsquo;atteindre des puissances de plusieurs centaines de watts. Le champ d&rsquo;application est donc tr\u00e8s large, la plupart des convertisseurs ayant une puissance nominale inf\u00e9rieure \u00e0 100 W.\u00a0\u00bb<\/p>\n<p>L&rsquo;une des limites des convertisseurs pi\u00e9zo\u00e9lectriques est la capacit\u00e9 parall\u00e8le dans le circuit \u00e9quivalent du r\u00e9sonateur. Celle-ci doit \u00eatre charg\u00e9e et d\u00e9charg\u00e9e, induisant un courant de circulation, ce qui induit des pertes.<\/p>\n<p>Le convertisseur DC-DC ouvre la voie \u00e0 l&rsquo;utilisation de convertisseurs pi\u00e9zo\u00e9lectriques sans transformateur, de sorte qu&rsquo;ils peuvent \u00eatre utilis\u00e9s dans une plus large gamme d&rsquo;applications.<\/p>\n<p>Le convertisseur \u00e0 r\u00e9sonateur pi\u00e9zo\u00e9lectrique isol\u00e9 \u00e0 double pont (DB-IPRC) fournit une isolation en utilisant deux r\u00e9sonateurs pi\u00e9zo\u00e9lectriques ind\u00e9pendants. La version am\u00e9lior\u00e9e du convertisseur DC-DC am\u00e9liore consid\u00e9rablement l&rsquo;efficacit\u00e9, tout en conservant le principe d&rsquo;isolation du convertisseur.<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"kaNdOcTY2S\"><p><a href=\"https:\/\/www.eenewseurope.com\/en\/ceo-interview-leti-takes-on-6g\/\">CEO interview: Leti takes on 6G<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content lazyload\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;CEO interview: Leti takes on 6G&#8221; &#8212; eeNews Europe\" data-src=\"https:\/\/www.eenewseurope.com\/en\/ceo-interview-leti-takes-on-6g\/embed\/#?secret=hY27aEWhur#?secret=kaNdOcTY2S\" data-secret=\"kaNdOcTY2S\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" data-load-mode=\"1\"><\/iframe><\/p>\n<p>L&rsquo;utilisation de r\u00e9sonateurs pi\u00e9zo\u00e9lectriques \u00e0 la place d&rsquo;inducteurs dans la conversion de puissance \u00ab\u00a0permettra de r\u00e9duire consid\u00e9rablement la taille des convertisseurs de puissance\u00a0\u00bb, a d\u00e9clar\u00e9 M. Despesse. \u00ab\u00a0Nos r\u00e9sultats permettent d&rsquo;\u00e9tendre ce type de conversion compacte aux convertisseurs isol\u00e9s. Ce type de convertisseur est donc d\u00e9sormais compatible avec une gamme beaucoup plus large d&rsquo;applications, telles que les t\u00e9l\u00e9viseurs, les t\u00e9l\u00e9phones, les tablettes et les outils \u00e9lectriques.\u00a0\u00bb<\/p>\n<p><a href=\"http:\/\/www.leti-cea.com\">www.leti-cea.com<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs fran\u00e7ais ont mis au point une technique qui ouvre la voie \u00e0 l&rsquo;utilisation de convertisseurs pi\u00e9zo\u00e9lectriques dans les t\u00e9l\u00e9viseurs, les t\u00e9l\u00e9phones, les tablettes et les outils \u00e9lectriques. Les chercheurs du CEA-Leti en France ont d\u00e9velopp\u00e9 un convertisseur DC-DC pour r\u00e9duire l&rsquo;oscillation de la tension pi\u00e9zo\u00e9lectrique et donc le courant circulant. Celui-ci est appliqu\u00e9 [&hellip;]<\/p>\n","protected":false},"author":34,"featured_media":461310,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[5716,901,7702,890],"domains":[47],"ppma_author":[3640,1153],"class_list":["post-461317","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-convertisseur-cc-cc","tag-energyharvesting-fr","tag-piezoelectrique","tag-powermanagement-fr","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Le CEA-Leti booste les convertisseurs CC-CC pi\u00e9zo\u00e9lectriques ...<\/title>\n<meta name=\"description\" content=\"Des chercheurs fran\u00e7ais ont mis au point un convertisseur pi\u00e9zo\u00e9lectrique CC-CC pour TVs, t\u00e9l\u00e9phones, tablettes et outils \u00e9lectriques.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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