{"id":725,"date":"2024-06-29T14:56:00","date_gmt":"2024-06-29T14:56:00","guid":{"rendered":"https:\/\/cnsfdz.com\/%e5%bc%80%e5%b0%94%e6%96%87%e5%9b%9b%e7%ab%af%e5%ad%90%e6%b5%8b%e9%87%8f%e6%8a%80%e6%9c%af%ef%bc%9a%e6%b6%88%e9%99%a4%e6%8e%a5%e8%a7%a6%e7%94%b5%e9%98%bb%e5%ae%9e%e7%8e%b0%e9%ab%98%e7%b2%be%e5%ba%a6\/"},"modified":"2026-02-04T16:11:26","modified_gmt":"2026-02-04T16:11:26","slug":"technologie-de-mesure-kelvin-a-quatre-bornes","status":"publish","type":"post","link":"https:\/\/cnsfdz.com\/fr\/technologie-de-mesure-kelvin-a-quatre-bornes\/","title":{"rendered":"Technologie de mesure Kelvin \u00e0 quatre bornes : \u00e9limination de la r\u00e9sistance de contact pour une d\u00e9tection de courant extr\u00eamement pr\u00e9cise"},"content":{"rendered":"<h2>I. Pourquoi une mesure \u00e0 quatre bornes ?<\/h2>\n<p>Dans la mesure de pr\u00e9cision actuelle, nous sommes confront\u00e9s \u00e0 un probl\u00e8me que nous ne pouvons ignorer :<strong>r\u00e9sistance de contact<\/strong>. Lorsque les shunts sont boulonn\u00e9s ou soud\u00e9s dans les circuits, une r\u00e9sistance de contact se produit aux points de connexion, et cette r\u00e9sistance suppl\u00e9mentaire peut entra\u00eener des erreurs de mesure.<\/p>\n<p>Si l'on prend l'exemple d'un shunt typique de 100 \u03bc\u03a9, si la r\u00e9sistance de contact au point de connexion est de 2 \u03bc\u03a9 (ce qui est courant dans la pratique), l'erreur est de 21 TP3T - ce qui est totalement inacceptable pour les applications n\u00e9cessitant une pr\u00e9cision de 0,51 TP3T ou m\u00eame de 0,11 TP3T.<\/p>\n<p>La technologie Kelvin \u00e0 quatre bornes est con\u00e7ue pour r\u00e9soudre ce probl\u00e8me.<\/p>\n<h2>Principe de mesure \u00e0 deux ou quatre bornes<\/h2>\n<h3>2.1 Concepts de base<\/h3>\n<p>La m\u00e9thode de mesure \u00e0 quatre bornes (\u00e9galement connue sous le nom de quatre fils) s\u00e9pare le chemin du courant du chemin de la mesure de la tension :<\/p>\n<ul>\n<li><strong>Borne de courant (Force)<\/strong>Pour le passage du courant mesur\u00e9, soumis \u00e0 la r\u00e9sistance de contact et \u00e0 la production de chaleur.<\/li>\n<li><strong>Borne de tension (Sens)<\/strong>La mesure de la chute de tension dans l'\u00e9l\u00e9ment r\u00e9sistif est utilis\u00e9e pour d\u00e9tecter la chute de tension dans l'\u00e9l\u00e9ment r\u00e9sistif sans faire passer de grands courants.<\/li>\n<\/ul>\n<h3>2.2 Principes de fonctionnement<\/h3>\n<p>dans une configuration \u00e0 quatre bornes :<\/p>\n<ol>\n<li>Les bornes de courant sont connect\u00e9es au circuit principal et le courant fort traverse le shunt.<\/li>\n<li>Les bornes de tension sont connect\u00e9es directement \u00e0 la zone active de l'\u00e9l\u00e9ment r\u00e9sistif et la chute de tension est mesur\u00e9e \u00e0 l'aide d'un appareil de mesure \u00e0 haute imp\u00e9dance.<\/li>\n<li>Comme il n'y a pratiquement pas de courant dans le circuit de mesure de la tension, la chute de tension dans la r\u00e9sistance de contact est n\u00e9gligeable.<\/li>\n<li>La tension mesur\u00e9e refl\u00e8te uniquement la chute de tension dans l'\u00e9l\u00e9ment r\u00e9sistif lui-m\u00eame, et non la r\u00e9sistance du contact.<\/li>\n<\/ol>\n<h3>2.3 Analyse des circuits \u00e9quivalents<\/h3>\n<p>R\u00e9sistance totale pour les mesures \u00e0 deux bornes = R shunt + R contact 1 + R contact 2<br \/>\nR\u00e9sistance mesur\u00e9e \u2248 R shunt pour une mesure \u00e0 quatre bornes (r\u00e9sistance de contact exclue)<\/p>\n<p>Cela permet aux mesures \u00e0 quatre bornes d'\u00eatre plus d'un ordre de grandeur plus pr\u00e9cises que les mesures \u00e0 deux bornes.<\/p>\n<h2>Troisi\u00e8mement, la conception structurelle du shunt \u00e0 quatre bornes<\/h2>\n<h3>3.1 Disposition des bornes<\/h3>\n<p>Les shunts standard \u00e0 quatre bornes ont g\u00e9n\u00e9ralement la structure suivante :<\/p>\n<ul>\n<li>Deux bornes de courant de grande section (g\u00e9n\u00e9ralement avec des trous de vis ou des connexions en cuivre)<\/li>\n<li>Deux bornes de d\u00e9tection de tension de petite taille (g\u00e9n\u00e9ralement des bornes \u00e0 broches ou \u00e0 vis)<\/li>\n<li>Les bornes de tension sont situ\u00e9es \u00e0 l'int\u00e9rieur des bornes de courant, pr\u00e8s de l'\u00e9l\u00e9ment r\u00e9sistif.<\/li>\n<\/ul>\n<h3>3.2 Emplacement du point de mesure de la tension<\/h3>\n<p>Le choix de l'emplacement du point de d\u00e9tection de la tension est essentiel :<\/p>\n<ul>\n<li>Doit \u00eatre situ\u00e9 dans une zone o\u00f9 le courant est r\u00e9parti de fa\u00e7on homog\u00e8ne<\/li>\n<li>\u00c9viter la proximit\u00e9 de la zone de soudage du terminal (distribution in\u00e9gale du courant)<\/li>\n<li>Les deux points de d\u00e9tection doivent \u00eatre dispos\u00e9s de mani\u00e8re sym\u00e9trique<\/li>\n<\/ul>\n<h3>3.3 Mat\u00e9riaux et proc\u00e9d\u00e9s<\/h3>\n<ul>\n<li>Bornes de courant : cuivre ou laiton violet, surface \u00e9tam\u00e9e\/nickel\u00e9e<\/li>\n<li>Bornes de tension : cuivre ou laiton, conception de petite taille r\u00e9duisant le transfert de chaleur<\/li>\n<li>\u00c9l\u00e9ment de r\u00e9sistance : cuivre au mangan\u00e8se et autres alliages \u00e0 faible TCR<\/li>\n<li>Soudage : soudage par faisceau d'\u00e9lectrons ou brasage<\/li>\n<\/ul>\n<h2>IV. points de conception du circuit d'application<\/h2>\n<h3>4.1 Circuit de mesure de la tension<\/h3>\n<ul>\n<li><strong>Imp\u00e9dance d'entr\u00e9e \u00e9lev\u00e9e<\/strong>L'imp\u00e9dance d'entr\u00e9e de l'amplificateur optique ou de l'ADC doit \u00eatre &gt;10M\u03a9.<\/li>\n<li><strong>Faible courant de polarisation<\/strong>Courant de polarisation d'entr\u00e9e : Le courant de polarisation d'entr\u00e9e doit \u00eatre aussi faible que possible.<\/li>\n<li><strong>entr\u00e9e diff\u00e9rentielle<\/strong>Utilisation d'amplificateurs d'instrumentation ou d'ADC diff\u00e9rentiels<\/li>\n<\/ul>\n<h3>4.2 Exigences en mati\u00e8re de c\u00e2blage<\/h3>\n<ul>\n<li>Acheminement s\u00e9par\u00e9 des lignes de courant et de tension<\/li>\n<li>Utiliser une paire torsad\u00e9e blind\u00e9e pour les lignes de d\u00e9tection de tension.<\/li>\n<li>Lignes de tension aussi courtes que possible pour r\u00e9duire les bruits de captage<\/li>\n<li>Mise \u00e0 la terre du blindage par une seule personne<\/li>\n<\/ul>\n<h3>4.3 Conception du circuit imprim\u00e9<\/h3>\n<ul>\n<li>Le chemin de courant et le chemin de d\u00e9tection sont s\u00e9par\u00e9s sur le circuit imprim\u00e9<\/li>\n<li>L'alignement des capteurs est fin pour \u00e9viter le shuntage<\/li>\n<li>Soyez conscient des effets du potentiel thermo\u00e9lectrique et \u00e9vitez d'utiliser des m\u00e9taux dissemblables.<\/li>\n<\/ul>\n<h2>V. Probl\u00e8mes courants et solutions<\/h2>\n<h3>5.1 Interf\u00e9rences thermopotentielles<\/h3>\n<p><strong>questions<\/strong>Les potentiels thermo\u00e9lectriques sont g\u00e9n\u00e9r\u00e9s au contact de diff\u00e9rents mat\u00e9riaux m\u00e9talliques, les gradients de temp\u00e9rature entra\u00eenent des erreurs de mesure.<br \/>\n<strong>plaquer<\/strong>\uff1a<\/p>\n<ul>\n<li>Utilisation de c\u00e2bles de raccordement du m\u00eame mat\u00e9riau<\/li>\n<li>Maintien d'une temp\u00e9rature uniforme aux points de connexion<\/li>\n<li>\u00c9limination du d\u00e9calage en courant continu \u00e0 l'aide de techniques d'excitation ou de d\u00e9coupage en courant alternatif<\/li>\n<\/ul>\n<h3>5.2 Interf\u00e9rences \u00e9lectromagn\u00e9tiques<\/h3>\n<p><strong>questions<\/strong>Le champ magn\u00e9tique g\u00e9n\u00e9r\u00e9 par le courant \u00e9lev\u00e9 induit une tension perturbatrice sur la ligne de d\u00e9tection de tension.<br \/>\n<strong>plaquer<\/strong>\uff1a<\/p>\n<ul>\n<li>Les fils de d\u00e9tection de tension sont \u00e9troitement tordus.<\/li>\n<li>Tenir \u00e0 l'\u00e9cart des conducteurs \u00e0 courant \u00e9lev\u00e9<\/li>\n<li>Arrangement raisonnable de la direction de l'alignement<\/li>\n<\/ul>\n<h3>5.3 Tension en mode commun<\/h3>\n<p><strong>questions<\/strong>Shunt \u00e0 potentiel \u00e9lev\u00e9 lors de la d\u00e9tection du c\u00f4t\u00e9 haut, tension de mode commun \u00e9lev\u00e9e<br \/>\n<strong>plaquer<\/strong>\uff1a<\/p>\n<ul>\n<li>Utilisation d'amplificateurs diff\u00e9rentiels avec un taux de r\u00e9jection en mode commun \u00e9lev\u00e9<\/li>\n<li>Adoption d'un syst\u00e8me de mesure isol\u00e9<\/li>\n<li>D\u00e9tection du c\u00f4t\u00e9 bas (si le syst\u00e8me le permet)<\/li>\n<\/ul>\n<h2>VI. exemples d'applications pratiques<\/h2>\n<h3>6.1 \u00c9quipement de test des batteries<\/h3>\n<p>Les tests de charge\/d\u00e9charge des batteries n\u00e9cessitent une mesure pr\u00e9cise du courant pour calculer la capacit\u00e9. L'utilisation d'un shunt \u00e0 quatre bornes et d'un CAN 24 bits permet d'obtenir une pr\u00e9cision de mesure du courant de 0,02%.<\/p>\n<h3>6.2 Compteurs intelligents<\/h3>\n<p>Le comptage de l'\u00e9lectricit\u00e9 exige une grande pr\u00e9cision et une stabilit\u00e9 \u00e0 long terme. Le shunt mangan\u00e8se-cuivre \u00e0 quatre bornes est la solution standard pour les compteurs intelligents, avec un niveau de pr\u00e9cision allant jusqu'\u00e0 0,2S.<\/p>\n<h3>6.3 Test de l'alimentation \u00e0 courant \u00e9lev\u00e9<\/h3>\n<p>Test d'efficacit\u00e9 des alimentations \u00e0 d\u00e9coupage, des onduleurs et d'autres dispositifs \u00e0 courant \u00e9lev\u00e9, shunt \u00e0 quatre bornes avec analyseur de puissance de pr\u00e9cision pour une mesure pr\u00e9cise de la puissance.<\/p>\n<h2>VII. r\u00e9sum\u00e9<\/h2>\n<p>La technologie Kelvin \u00e0 quatre bornes est la base de la mesure pr\u00e9cise du courant. Elle \u00e9limine efficacement l'effet de la r\u00e9sistance de contact sur la mesure en s\u00e9parant le chemin du courant du chemin de la mesure de la tension. Lors de la conception d'un syst\u00e8me de mesure \u00e0 quatre bornes, il convient de pr\u00eater attention \u00e0 des d\u00e9tails tels que la disposition des bornes, les m\u00e9thodes de c\u00e2blage, la conception du circuit imprim\u00e9, etc., tout en se prot\u00e9geant contre des probl\u00e8mes tels que le potentiel thermique et les interf\u00e9rences \u00e9lectromagn\u00e9tiques. L'application correcte de la technologie \u00e0 quatre bornes peut am\u00e9liorer la pr\u00e9cision de la mesure du courant shunt \u00e0 0,1% ou m\u00eame plus, r\u00e9pondant ainsi aux exigences strictes du stockage de l'\u00e9nergie, des v\u00e9hicules \u00e9lectriques, du comptage et d'autres domaines.<\/p>","protected":false},"excerpt":{"rendered":"<p>D\u00e9taille les principes, les avantages et l'application pratique de la technique de connexion Kelvin \u00e0 quatre bornes dans la mesure du courant shunt.<\/p>","protected":false},"author":1,"featured_media":749,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-725","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech-articles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v26.9) - 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