{"id":209776,"date":"2024-09-16T23:37:07","date_gmt":"2024-09-16T23:37:07","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/?p=209776"},"modified":"2024-09-16T23:37:07","modified_gmt":"2024-09-16T23:37:07","slug":"quest-ce-quune-thermistance","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/fr\/quest-ce-quune-thermistance\/","title":{"rendered":"Qu&rsquo;est-ce qu&rsquo;une thermistance ?"},"content":{"rendered":"<p class=\"sidekick\">Thermistance : composant \u00e9lectronique ayant une r\u00e9sistance variable selon la temp\u00e9rature. D\u00e9couvrez son fonctionnement et applications en ing\u00e9nierie thermique.<\/p>\n<h2>Qu&rsquo;est-ce qu&rsquo;une thermistance ?<\/h2>\n<p>Une thermistance est un type de r\u00e9sistance dont la valeur varie significativement avec la temp\u00e9rature. Elle est largement utilis\u00e9e dans divers appareils pour mesurer la temp\u00e9rature ou pour contr\u00f4ler des circuits en r\u00e9ponse aux changements de temp\u00e9rature.<\/p>\n<h2>Types de thermistances<\/h2>\n<p>Les thermistances se divisent principalement en deux types :<\/p>\n<ul>\n<li>Thermistances CTN (Coefficient de Temp\u00e9rature N\u00e9gatif)<\/li>\n<li>Thermistances CTP (Coefficient de Temp\u00e9rature Positif)<\/li>\n<\/ul>\n<h3>Thermistances CTN (NTC)<\/h3>\n<p>Les thermistances CTN, ou NTC (Negative Temperature Coefficient en anglais), diminuent en r\u00e9sistance lorsque la temp\u00e9rature augmente. Elles sont souvent utilis\u00e9es dans les capteurs de temp\u00e9rature et les circuits de protection contre les surchauffes.<\/p>\n<h3>Thermistances CTP (PTC)<\/h3>\n<p>Les thermistances CTP, ou PTC (Positive Temperature Coefficient en anglais), augmentent en r\u00e9sistance lorsque la temp\u00e9rature augmente. Elles sont couramment utilis\u00e9es dans les dispositifs de protection contre les surintensit\u00e9s et pour la maintenance de la temp\u00e9rature.<\/p>\n<h2>Fonctionnement d&rsquo;une thermistance<\/h2>\n<p>Le fonctionnement d&rsquo;une thermistance repose sur la relation entre la temp\u00e9rature et la r\u00e9sistivit\u00e9 des mat\u00e9riaux semi-conducteurs qui la composent. Cette relation peut \u00eatre approxim\u00e9e par l&rsquo;\u00e9quation de Steinhart-Hart pour les CTN :<\/p>\n<p>\\( \\frac{1}{T} = A + B \\ln(R) + C (\\ln(R))^3 \\)<\/p>\n<p>o\u00f9 :<\/p>\n<ul>\n<li>\\( T \\) est la temp\u00e9rature en Kelvin<\/li>\n<li>\\( R \\) est la r\u00e9sistance de la thermistance<\/li>\n<li>et \\( A \\), \\( B \\), et \\( C \\) sont des constantes d\u00e9termin\u00e9es exp\u00e9rimentalement.<\/li>\n<\/ul>\n<p>Pour les CTP, la relation est g\u00e9n\u00e9ralement lin\u00e9aire sur une plage sp\u00e9cifique de temp\u00e9ratures, ce qui simplifie leur utilisation dans certaines applications.<\/p>\n<h2>Applications des thermistances<\/h2>\n<p>Les thermistances trouvent de nombreuses applications dans notre vie quotidienne :<\/p>\n<ul>\n<li><strong>Mesure de temp\u00e9rature :<\/strong> Utilis\u00e9es dans les thermom\u00e8tres digitaux, les sondes de temp\u00e9rature, et les thermostats.<\/li>\n<li><strong>Protection de circuit :<\/strong> Les thermistances CTP sont utilis\u00e9es pour prot\u00e9ger contre les surintensit\u00e9s en augmentant leur r\u00e9sistance et en limitant le courant en cas de surchauffe.<\/li>\n<li><strong>Compensation de temp\u00e9rature :<\/strong> Utilis\u00e9es dans les circuits \u00e9lectroniques pour compenser les variations dues \u00e0 la temp\u00e9rature.<\/li>\n<li><strong>Appareils \u00e9lectrom\u00e9nagers :<\/strong> Int\u00e9gr\u00e9es dans des appareils comme les machines \u00e0 laver et les r\u00e9frig\u00e9rateurs pour r\u00e9guler la temp\u00e9rature de fonctionnement.<\/li>\n<\/ul>\n<h2>Conclusion<\/h2>\n<p>Comprendre le fonctionnement des thermistances et leurs applications est essentiel pour de nombreux domaines de l&rsquo;ing\u00e9nierie et de l&rsquo;\u00e9lectronique. Leur capacit\u00e9 \u00e0 r\u00e9agir aux changements de temp\u00e9rature les rend particuli\u00e8rement utiles pour des applications vari\u00e9es allant des simples appareils m\u00e9nagers aux syst\u00e8mes de contr\u00f4le complexes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thermistance : composant \u00e9lectronique ayant une r\u00e9sistance variable selon la temp\u00e9rature. D\u00e9couvrez son fonctionnement et applications en ing\u00e9nierie thermique.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[98],"tags":[],"class_list":["post-209776","post","type-post","status-publish","format-standard","hentry","category-des-questions","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce qu&#039;une thermistance ?<\/title>\n<meta name=\"description\" content=\"Thermistance : composant \u00e9lectronique ayant une r\u00e9sistance variable selon la temp\u00e9rature. 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