{"id":11299,"date":"2020-08-25T22:23:58","date_gmt":"2020-08-25T22:23:58","guid":{"rendered":"https:\/\/summitinterconnect.ca\/blog\/article\/filtres-rc-led-et-buzzers\/"},"modified":"2025-12-17T10:48:57","modified_gmt":"2025-12-17T10:48:57","slug":"rc-filters-leds-buzzers","status":"publish","type":"post","link":"https:\/\/summitinterconnect.ca\/fr\/blog\/article\/rc-filters-leds-buzzers\/","title":{"rendered":"Filtres RC, LED et buzzers"},"content":{"rendered":"
Lorsqu\u2019une **diff\u00e9rence de potentiel** existe aux bornes d\u2019une **r\u00e9sistance**, les charges se d\u00e9placent jusqu\u2019\u00e0 ce que cette **diff\u00e9rence de potentiel devienne nulle**. \nSi aucune **voie de sortie** n\u2019est disponible pour les charges, chaque charge traversant la r\u00e9sistance **r\u00e9duit l\u00e9g\u00e8rement la diff\u00e9rence de potentiel**, ce qui diminue progressivement le **d\u00e9bit du courant**. \nCe comportement est \u00e0 l\u2019origine de la **courbure exponentielle caract\u00e9ristique** des circuits **RC**.<\/p>\n
Filtre RC<\/h2>\n
Lorsque **l\u2019interrupteur S1 est ferm\u00e9**, **R2 est directement reli\u00e9 \u00e0 la masse** et **R1 ne fait que dissiper de la chaleur**. \nDans ce cas, **C1 et R2 sont les seuls composants pertinents** pour l\u2019analyse du **filtre RC**.<\/p>\n
Lorsque **S1 est ouvert**, **R2 est connect\u00e9 \u00e0 Vcc via R1**, ce qui signifie que **R1, R2 et C1 doivent \u00eatre pris en compte** dans les calculs du filtre.<\/p>\n
Choix du condensateur pour le filtre RC<\/h3>\n
Nous avons un large choix de **valeurs de condensateurs**. \nL\u2019objectif est de s\u00e9lectionner un composant avec : \n\u2013 **Faible inductance s\u00e9rie \u00e9quivalente (ESL)** \n\u2013 **Faible r\u00e9sistance s\u00e9rie \u00e9quivalente (ESR)** \n\u2013 **Un co\u00fbt r\u00e9duit** <\/p>\n
Ces crit\u00e8res **orientent notre choix vers les condensateurs c\u00e9ramiques multicouches (MLCC)**. \nPuisque nous utilisons d\u00e9j\u00e0 **des condensateurs c\u00e9ramiques de 0,1 \u03bcF** \u00e0 plusieurs endroits dans le circuit, nous pouvons simplement en utiliser un ici. \n\u00c0 ce stade, ce choix est **arbitraire** et non bas\u00e9 sur un calcul pr\u00e9cis.<\/p>\n
La **fiche technique de l\u2019interrupteur** indique un **temps de stabilisation de 5 ms (0,005 s)**. \nSi ce temps \u00e9tait plus long, comme **10 \u00e0 20 ms** (typiquement observ\u00e9 avec un **relais**), nous pourrions envisager un **condensateur de plus grande valeur**, aux alentours de **1 \u00b5F**.<\/p>\n
Notre objectif est de concevoir un **circuit RC** qui assure la **transition entre Vcc et l\u2019\u00e9tat bas logique** en **5 ms ou plus**.<\/p>\n
Choix de la r\u00e9sistance pour le filtre RC en phase de d\u00e9charge<\/h3><\/figure>
Et nous choisirions une r\u00e9sistance de valeur similaire de la s\u00e9rie E24, soit 43 k\u03a9, avec les grandes tol\u00e9rances des condensateurs et des r\u00e9sistances, cela n'a pas beaucoup de sens de s\u00e9lectionner une r\u00e9sistance plus pr\u00e9cise que celle-ci.<\/p>\n
R\u00e9sistance de rappel<\/h3>\n
La fonction d'une r\u00e9sistance de rappel est de garantir qu'une entr\u00e9e num\u00e9rique se trouve dans un \u00e9tat logique d\u00e9fini lorsqu'aucun autre \u00e9l\u00e9ment du circuit n'agit sur l'entr\u00e9e. Lorsque le commutateur s'ouvre, l'entr\u00e9e num\u00e9rique \u00ab Dig \u00bb est connect\u00e9e \u00e0 Vcc via les r\u00e9sistances R1 et R2, elles doivent donc toutes deux \u00eatre incluses dans le calcul. <\/p><\/figure><\/figure>
Une valeur de 30 mA peut facilement d\u00e9passer la puissance de sortie recommand\u00e9e pour certaines petites piles bouton. Il est donc indispensable d'utiliser une r\u00e9sistance sup\u00e9rieure \u00e0 110 \u03a9. N'oubliez pas non plus que plusieurs interrupteurs peuvent \u00eatre actionn\u00e9s simultan\u00e9ment, ce qui consomme beaucoup d'\u00e9nergie sur une petite alimentation. Dans ce cas, il est conseill\u00e9 de diminuer la capacit\u00e9 et d'augmenter la r\u00e9sistance afin de r\u00e9duire le courant traversant la r\u00e9sistance de rappel. <\/p>\n
Chaque transition peut provoquer un bruit \u00e9lectromagn\u00e9tique et d\u00e9clencher l'entr\u00e9e d'un circuit int\u00e9gr\u00e9. Imaginez le commutateur ci-dessus utilis\u00e9 dans une application de comptage. Chaque pression sur le commutateur peut \u00eatre consid\u00e9r\u00e9e comme 10 comptages par un circuit int\u00e9gr\u00e9. <\/p>\n
LED RVB adressables<\/h2>\n
Les LED RVB adressables utilis\u00e9es dans ce circuit fonctionnent sur un rail d'alimentation de 5 V et une logique de 5 V. Bien qu'une alimentation de 3,3 V puisse probablement suffire, des rebonds de masse et des chutes de tension \u00e0 l'int\u00e9rieur des LED pourraient poser probl\u00e8me. Un convertisseur de niveau logique est donc cr\u00e9\u00e9 \u00e0 partir d'un MOSFET canal N. Le circuit int\u00e8gre un condensateur de d\u00e9rivation et un condensateur de masse pour chaque LED afin de r\u00e9duire le bruit, en partant du principe que les LED peuvent \u00eatre \u00e9loign\u00e9es les unes des autres. Le condensateur de 0,1 \u00b5F doit \u00eatre plac\u00e9 au plus pr\u00e8s de la LED, tandis que le condensateur de 10 \u00b5F doit \u00eatre plac\u00e9 juste de l'autre c\u00f4t\u00e9. <\/p><\/figure>
Buzzer pi\u00e9zo<\/h2>\n
Lorsque les cristaux sont expos\u00e9s \u00e0 des champs \u00e9lectriques, ils fl\u00e9chissent et se d\u00e9forment.<\/p>Cette interpr\u00e9tation artistique de la d\u00e9formation cristalline est tir\u00e9e d'un article sur les pi\u00e9zo\u00e9lectriques sur AllAboutCircuits.com.<\/figcaption><\/figure>
En attachant le cristal \u00e0 une substance qui ne fl\u00e9chit pas en pr\u00e9sence de champs \u00e9lectriques, des contraintes diff\u00e9rentielles peuvent \u00eatre utilis\u00e9es pour faire vibrer les mol\u00e9cules d'air \u00e0 des fr\u00e9quences audibles.<\/p>","protected":false},"excerpt":{"rendered":"
Lorsqu\u2019une **diff\u00e9rence de potentiel** existe aux bornes d\u2019une **r\u00e9sistance**, les charges se d\u00e9placent jusqu\u2019\u00e0 ce que cette **diff\u00e9rence de potentiel devienne nulle**. Si aucune **voie de sortie** n\u2019est disponible pour les charges, chaque charge traversant la r\u00e9sistance **r\u00e9duit l\u00e9g\u00e8rement la diff\u00e9rence de potentiel**, ce qui diminue progressivement le **d\u00e9bit du courant**. Ce comportement est \u00e0 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[86,87],"tags":[],"class_list":["post-11299","post","type-post","status-publish","format-standard","hentry","category-conception","category-theorie"],"acf":[],"yoast_head":"\n
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