{"id":5584,"date":"2022-01-04T11:24:32","date_gmt":"2022-01-04T08:24:32","guid":{"rendered":"http:\/\/www.temrinler.com\/?p=5584"},"modified":"2023-11-20T11:25:26","modified_gmt":"2023-11-20T08:25:26","slug":"ptcli-sicaklikta-calisan-devre","status":"publish","type":"post","link":"https:\/\/www.temrinler.com\/?p=5584","title":{"rendered":"PTC\u2019li s\u0131cakl\u0131kta \u00e7al\u0131\u015fan devre"},"content":{"rendered":"

G\u00f6rsel 2.2\u2019deki devrede oda s\u0131cakl\u0131\u011f\u0131nda (yakla\u015f\u0131k 25 \u00b0C) PTC\u2019nin direnci yakla\u015f\u0131k 82 \u2126\u2019dur. Oda s\u0131cakl\u0131\u011f\u0131nda 0,7 V\u2019luk pozitif polarmas\u0131n\u0131 R1 ve potansiyometre \u00a0\u00fczerinden alamayan transist\u00f6r\u00fcn beyz ucu transist\u00f6r\u00fc kesimde tutacak ve LED s\u00f6n\u00fck kalacakt\u0131r. PTC \u0131s\u0131lt\u0131ld\u0131\u011f\u0131nda direnci artacak ve \u00fczerine d\u00fc\u015fen gerilimde artacakt\u0131r. VBE <\/sub>gerilimi yakla\u015f\u0131k 0,7 V\u2019a ula\u015ft\u0131\u011f\u0131nda beyz polarmas\u0131 alan transist\u00f6r iletime ge\u00e7ecek ve LED yanacakt\u0131r. \u0130letime ge\u00e7me s\u0131cakl\u0131\u011f\u0131 potansiyometre ile ayarlanabilir.<\/p>\n

\"\"<\/a><\/p>\n

G\u00f6rsel 2.2: PTC\u2019li s\u0131cakl\u0131kta \u00e7al\u0131\u015fan devre<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 MALZEME L\u0130STES\u0130<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n
Ad\u0131<\/strong><\/td>\n\u00d6zelli\u011fi<\/strong><\/td>\nSembol\u00fc<\/strong><\/td>\nG\u00f6r\u00fcn\u00fc\u015f\u00fc<\/strong><\/td>\nMiktar\u0131<\/strong><\/td>\n<\/tr>\n
Transist\u00f6r<\/strong><\/td>\nBC237 (TO-92 k\u0131l\u0131f)<\/td>\n<\/td>\n<\/td>\n1 adet<\/td>\n<\/tr>\n
LED<\/strong><\/td>\nK\u0131rm\u0131z\u0131<\/td>\n<\/td>\n<\/td>\n1 adet<\/td>\n<\/tr>\n
Diren\u00e7<\/strong><\/td>\n1k<\/td>\n<\/td>\n<\/td>\n1 adet<\/td>\n<\/tr>\n
Diren\u00e7<\/strong><\/td>\n10k<\/td>\n<\/td>\n<\/td>\n1 adet<\/td>\n<\/tr>\n
Potansiyometre<\/strong><\/td>\n4,7k<\/td>\n<\/td>\n<\/td>\n1 adet<\/td>\n<\/tr>\n
PTC<\/strong><\/td>\n82R<\/td>\n<\/td>\n<\/td>\n1 adet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0<\/strong><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u0130\u015eLEM BASAMAKLARI<\/strong><\/p>\n

    \n
  1. PTC\u2019nin devreye ba\u011flant\u0131s\u0131n\u0131 yapmadan \u00f6nce oda s\u0131cakl\u0131\u011f\u0131nda ve \u0131s\u0131t\u0131ld\u0131\u011f\u0131nda (Havya kullan\u0131labilir.) direncini \u00f6l\u00e7\u00fcp Tablo 2.2\u2019e yaz\u0131n\u0131z.<\/li>\n
  2. G\u00f6rsel 2.2\u2019deki devreyi kurunuz.<\/li>\n
  3. Devreye enerji veriniz. LED\u2019in oda s\u0131cakl\u0131\u011f\u0131nda ve \u0131s\u0131t\u0131ld\u0131\u011f\u0131nda verdi\u011fi en iyi tepkiyi (veya referans s\u0131cakl\u0131\u011f\u0131n\u0131) potansiyometre ile ayarlay\u0131n\u0131z.<\/li>\n
  4. Voltmetreyi transist\u00f6r\u00fcn beyz ucuna (B noktas\u0131na) ba\u011flay\u0131n\u0131z.<\/li>\n
  5. LED\u2019in durumunu ve voltmetreyle \u00f6l\u00e7\u00fclen de\u011feri Tablo 2.2\u2019ye yaz\u0131n\u0131z.<\/li>\n
  6. PTC\u2019yi havya ile \u0131s\u0131t\u0131n\u0131z.<\/li>\n
  7. LED\u2019in durumunu ve voltmetreyle \u00f6l\u00e7\u00fclen de\u011feri Tablo 2.2\u2019ye yaz\u0131n\u0131z.<\/li>\n<\/ol>\n

     <\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DE\u011eERLEND\u0130RMELER<\/strong><\/p>\n

    Tablo 2.2: PTC \u00dczerine D\u00fc\u015fen Gerilim<\/p>\n\n\n\n\n\n
    PTC<\/strong><\/td>\nDiren\u00e7 (\u2126)<\/strong><\/td>\nBeyz Gerilimi (V)<\/strong><\/td>\nLED\u2019in Durumu (Yan\u0131k \/ S\u00f6n\u00fck)<\/strong><\/td>\n<\/tr>\n
    Oda s\u0131cakl\u0131\u011f\u0131nda<\/strong><\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
    Is\u0131t\u0131ld\u0131\u011f\u0131nda<\/strong><\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u00a0<\/strong><\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SORULAR<\/strong><\/p>\n

      \n
    1. LED\u2019in PTC \u0131s\u0131t\u0131ld\u0131\u011f\u0131nda s\u00f6nmesi i\u00e7in devrede nas\u0131l de\u011fi\u015fiklik yapmak gerekir?<\/li>\n
    2. PTC\u2019nin sa\u011flaml\u0131k kontrol\u00fc nas\u0131l yap\u0131l\u0131r, k\u0131saca a\u00e7\u0131klay\u0131n\u0131z.<\/li>\n
    3. Devrede PTC yerine NTC kullan\u0131lmas\u0131, devrenin \u00e7al\u0131\u015fmas\u0131n\u0131 nas\u0131l etkiler?<\/li>\n<\/ol>\n

       <\/p>\n

       <\/p>\n

       <\/p>\n\n\n

      LED’in PTC (Positive Temperature Coefficient) bir termist\u00f6rle \u0131s\u0131t\u0131ld\u0131\u011f\u0131nda s\u00f6nmesini sa\u011flamak i\u00e7in devre \u00fczerinde baz\u0131 de\u011fi\u015fiklikler gerekebilir:<\/p>\n\n\n\n

        \n
      1. PTC’nin Devre Konumu ve Ba\u011flant\u0131lar\u0131:<\/strong> PTC, LED’in g\u00fc\u00e7 beslemesine ba\u011fl\u0131ysa, PTC’nin direnci y\u00fcksek s\u0131cakl\u0131kta artar. LED’in s\u00f6nmesi isteniyorsa, PTC’nin bu art\u0131\u015ftan dolay\u0131 LED’e ba\u011fl\u0131 gerilimi d\u00fc\u015f\u00fcrebilecek \u015fekilde devre ayarlanabilir.<\/li>\n\n\n\n
      2. PTC’nin Diren\u00e7-Karakteristikleri:<\/strong> PTC’nin direnci genellikle s\u0131cakl\u0131k artt\u0131k\u00e7a artar. Bu nedenle, PTC y\u00fcksek s\u0131cakl\u0131klarda direncini art\u0131rarak, LED’in \u00fczerine d\u00fc\u015fen gerilimi azaltabilir ve dolay\u0131s\u0131yla LED’in s\u00f6nmesini sa\u011flayabilir.<\/li>\n<\/ol>\n\n\n\n

        PTC’nin sa\u011flaml\u0131k kontrol\u00fc, genellikle diren\u00e7 de\u011ferlerinin belirli bir s\u0131cakl\u0131k aral\u0131\u011f\u0131nda nas\u0131l de\u011fi\u015fti\u011fini anlamak i\u00e7in yap\u0131l\u0131r. Bu, bir multimetre veya \u00f6zel diren\u00e7 \u00f6l\u00e7\u00fcm cihazlar\u0131yla ger\u00e7ekle\u015ftirilir. PTC’nin belirli s\u0131cakl\u0131k aral\u0131klar\u0131nda do\u011fru diren\u00e7 de\u011ferlerini g\u00f6sterip g\u00f6stermedi\u011fi kontrol edilir. \u00dcreticinin belirtti\u011fi teknik verilerle kar\u015f\u0131la\u015ft\u0131r\u0131larak PTC’nin sa\u011fl\u0131kl\u0131 olup olmad\u0131\u011f\u0131 belirlenir.<\/p>\n\n\n\n

        Devrede PTC yerine NTC kullan\u0131lmas\u0131, devrenin \u00e7al\u0131\u015fmas\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde etkileyebilir. NTC ve PTC termist\u00f6rlerin diren\u00e7-\u0131s\u0131 karakteristikleri z\u0131t y\u00f6nl\u00fcd\u00fcr. Yani, PTC s\u0131cakl\u0131k artt\u0131k\u00e7a direnci artar, NTC ise s\u0131cakl\u0131k artt\u0131k\u00e7a direnci azal\u0131r. Bu, devre \u00fczerindeki gerilim d\u00fc\u015f\u00fc\u015f\u00fc ve ak\u0131m de\u011ferlerinde farkl\u0131 etkiler do\u011furabilir. Bu nedenle, PTC’nin yerine NTC kullan\u0131lmas\u0131 devrenin stabilitesini ve performans\u0131n\u0131 de\u011fi\u015ftirebilir. Bu t\u00fcr bir de\u011fi\u015fiklik yap\u0131l\u0131rken devrenin g\u00fcvenli\u011fi ve beklenen performans\u0131 dikkate al\u0131nmal\u0131d\u0131r.<\/p>\n","protected":false},"excerpt":{"rendered":"

        G\u00f6rsel 2.2\u2019deki devrede oda s\u0131cakl\u0131\u011f\u0131nda (yakla\u015f\u0131k 25 \u00b0C) PTC\u2019nin direnci yakla\u015f\u0131k 82 \u2126\u2019dur. Oda s\u0131cakl\u0131\u011f\u0131nda 0,7 V\u2019luk pozitif polarmas\u0131n\u0131 R1 ve potansiyometre \u00a0\u00fczerinden alamayan transist\u00f6r\u00fcn beyz ucu transist\u00f6r\u00fc kesimde tutacak ve LED s\u00f6n\u00fck kalacakt\u0131r. PTC \u0131s\u0131lt\u0131ld\u0131\u011f\u0131nda direnci artacak ve \u00fczerine d\u00fc\u015fen gerilimde artacakt\u0131r. VBE gerilimi yakla\u015f\u0131k 0,7 V\u2019a ula\u015ft\u0131\u011f\u0131nda beyz polarmas\u0131 alan transist\u00f6r iletime ge\u00e7ecek […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63,75],"tags":[],"_links":{"self":[{"href":"https:\/\/www.temrinler.com\/index.php?rest_route=\/wp\/v2\/posts\/5584"}],"collection":[{"href":"https:\/\/www.temrinler.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.temrinler.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.temrinler.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.temrinler.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5584"}],"version-history":[{"count":0,"href":"https:\/\/www.temrinler.com\/index.php?rest_route=\/wp\/v2\/posts\/5584\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.temrinler.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.temrinler.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5584"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.temrinler.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}