{"id":210058,"date":"2024-09-17T07:03:39","date_gmt":"2024-09-17T07:03:39","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/?p=210058"},"modified":"2024-09-17T07:03:39","modified_gmt":"2024-09-17T07:03:39","slug":"comment-calculer-la-frequence-et-le-cycle-de-service-dun-circuit-a-minuterie-555","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/fr\/comment-calculer-la-frequence-et-le-cycle-de-service-dun-circuit-a-minuterie-555\/","title":{"rendered":"Comment calculer la fr\u00e9quence et le cycle de service d&rsquo;un circuit \u00e0 minuterie 555?"},"content":{"rendered":"<p class=\"sidekick\">Calculer la fr\u00e9quence et le cycle de service d&rsquo;un circuit \u00e0 minuterie 555 : apprenez \u00e0 configurer et optimiser cet incontournable composant en ing\u00e9nierie thermique.<\/p>\n<h2>Comment calculer la fr\u00e9quence et le cycle de service d&rsquo;un circuit \u00e0 minuterie 555 ?<\/h2>\n<p>Le circuit int\u00e9gr\u00e9 555 est l&rsquo;un des composants les plus utilis\u00e9s dans les circuits de temporisation. Il peut fonctionner en mode monostable ou astable. Dans cet article, nous nous concentrons sur le mode astable, o\u00f9 le 555 g\u00e9n\u00e8re une onde carr\u00e9e p\u00e9riodique. Nous verrons comment calculer la fr\u00e9quence et le cycle de service (ou rapport cyclique) d&rsquo;un circuit \u00e0 minuterie 555.<\/p>\n<h2>Param\u00e8tres du circuit<\/h2>\n<p>Pour un circuit \u00e0 minuterie 555 en mode astable, vous aurez besoin des composants suivants :<\/p>\n<ul>\n<li>Une r\u00e9sistance R<sub>1<\/sub><\/li>\n<li>Une r\u00e9sistance R<sub>2<\/sub><\/li>\n<li>Un condensateur C<\/li>\n<\/ul>\n<h2>Calcul de la fr\u00e9quence<\/h2>\n<p>La fr\u00e9quence f du signal d&rsquo;onde carr\u00e9e g\u00e9n\u00e9r\u00e9 par le circuit peut \u00eatre calcul\u00e9e en utilisant la formule :<\/p>\n<p>\n  <i>f = \\frac{1.44}{(R<sub>1<\/sub> + 2 * R<sub>2<\/sub>) * C}<\/i>\n<\/p>\n<p>O\u00f9 :<\/p>\n<ul>\n<li>f est la fr\u00e9quence en Hertz (Hz)<\/li>\n<li>R<sub>1<\/sub> et R<sub>2<\/sub> sont les r\u00e9sistances en ohms (\u03a9)<\/li>\n<li>C est la capacit\u00e9 en farads (F)<\/li>\n<\/ul>\n<h2>Calcul du cycle de service<\/h2>\n<p>Le cycle de service (ou rapport cyclique, D) est le rapport de la dur\u00e9e pendant laquelle le signal est \u00e9lev\u00e9 (\u00e0 l&rsquo;\u00e9tat haut) par rapport \u00e0 la p\u00e9riode totale du signal. Il est exprim\u00e9 en pourcentage et peut \u00eatre calcul\u00e9 en utilisant les formules suivantes :<\/p>\n<p>La dur\u00e9e de l&rsquo;\u00e9tat haut (T<sub>haut<\/sub>) :<\/p>\n<p>\n  <i>T<sub>haut<\/sub> = 0.693 * (R<sub>1<\/sub> + R<sub>2<\/sub>) * C<\/i>\n<\/p>\n<p>La dur\u00e9e de l&rsquo;\u00e9tat bas (T<sub>bas<\/sub>) :<\/p>\n<p>\n  <i>T<sub>bas<\/sub> = 0.693 * R<sub>2<\/sub> * C<\/i>\n<\/p>\n<p>La p\u00e9riode totale T :<\/p>\n<p>\n  <i>T = T<sub>haut<\/sub> + T<sub>bas<\/sub><\/i>\n<\/p>\n<p>Le cycle de service D (% de temps \u00e0 l&rsquo;\u00e9tat haut) :<\/p>\n<p>\n  <i>D = \\frac{T<sub>haut<\/sub>}{\u00ab\u00a0T\u00a0\u00bb} * 100 = \\frac{(R<sub>1<\/sub> + R<sub>2<\/sub>)}{(R<sub>1<\/sub> + 2 * R<sub>2<\/sub>)} * 100<\/i>\n<\/p>\n<h2>Application pratique<\/h2>\n<p>Pour illustrer, imaginons un circuit o\u00f9 :<\/p>\n<ul>\n<li>R<sub>1<\/sub> = 1 k\u03a9<\/li>\n<li>R<sub>2<\/sub> = 2 k\u03a9<\/li>\n<li>C = 100 \u03bcF<\/li>\n<\/ul>\n<p>Calculons la fr\u00e9quence :<\/p>\n<p>\n  <i>f = \\frac{1.44}{(1000 + 2 * 2000) * 100 * 10<sup>-6<\/sup>} = \\frac{1.44}{(5000) * 100 * 10<sup>-6<\/sup>} \u2248 2.88 Hz<\/i>\n<\/p>\n<p>Calculons le cycle de service :<\/p>\n<p>\n  <i>D = \\frac{(1000 + 2000)}{(1000 + 2 * 2000)} * 100 = \\frac{3000}{5000} * 100 \u2248 60%<\/i>\n<\/p>\n<p>Ainsi, le circuit g\u00e9n\u00e8re un signal de fr\u00e9quence 2.88 Hz avec un cycle de service de 60%.<\/p>\n<h2>Conclusion<\/h2>\n<p>Le 555 est un composant polyvalent en mode astable, id\u00e9al pour g\u00e9n\u00e9rer des signaux d&rsquo;horloge et des ondes carr\u00e9es pour diverses applications. Le calcul de la fr\u00e9quence et du cycle de service permet de dimensionner pr\u00e9cis\u00e9ment les r\u00e9sistances et le condensateur n\u00e9cessaires pour obtenir les caract\u00e9ristiques de signal souhait\u00e9es.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calculer la fr\u00e9quence et le cycle de service d&rsquo;un circuit \u00e0 minuterie 555 : apprenez \u00e0 configurer et optimiser cet incontournable composant 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-210058","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>Comment calculer la fr\u00e9quence et le cycle de service d&#039;un circuit \u00e0 minuterie 555?<\/title>\n<meta name=\"description\" content=\"Calculer la fr\u00e9quence et le cycle de service d&#039;un circuit \u00e0 minuterie 555 : apprenez \u00e0 configurer et optimiser cet incontournable composant en ing\u00e9nierie thermique.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.electricity-magnetism.org\/fr\/comment-calculer-la-frequence-et-le-cycle-de-service-dun-circuit-a-minuterie-555\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment calculer la fr\u00e9quence et le cycle de service d&#039;un circuit \u00e0 minuterie 555?\" \/>\n<meta property=\"og:description\" content=\"Calculer la fr\u00e9quence et le cycle de service d&#039;un circuit \u00e0 minuterie 555 : apprenez \u00e0 configurer et optimiser cet incontournable composant en ing\u00e9nierie thermique.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.electricity-magnetism.org\/fr\/comment-calculer-la-frequence-et-le-cycle-de-service-dun-circuit-a-minuterie-555\/\" \/>\n<meta property=\"og:site_name\" content=\"Electricity - 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