{"id":12601,"date":"2023-08-25T23:42:59","date_gmt":"2023-08-25T23:42:59","guid":{"rendered":"https:\/\/www2.iled-lights.com\/?p=12601"},"modified":"2023-08-25T23:43:19","modified_gmt":"2023-08-25T23:43:19","slug":"what-is-led-junction-temperature-and-how-to-reduce-it","status":"publish","type":"post","link":"https:\/\/www.iled-lights.com\/tr\/what-is-led-junction-temperature-and-how-to-reduce-it-a10.html","title":{"rendered":"LED eklem s\u0131cakl\u0131\u011f\u0131 nedir ve nas\u0131l azalt\u0131l\u0131r >"},"content":{"rendered":"

1. LED eklem s\u0131cakl\u0131\u011f\u0131 nedir? ><\/p>\n

LED'in temel yap\u0131s\u0131 yar\u0131 iletken P-N eklemidir. Deneyler, P-N eklem s\u0131cakl\u0131\u011f\u0131n\u0131n y\u00fckselece\u011fini g\u00f6stermektedir ve ak\u0131m LED \u00f6ge \u00fczerinden akt\u0131\u011f\u0131nda, kesin anlamda P-N eklem b\u00f6lgesinin s\u0131cakl\u0131\u011f\u0131, LED'in eklem s\u0131cakl\u0131\u011f\u0131 olarak tan\u0131mlan\u0131r. Genellikle \u00f6ge \u00e7iplerinin k\u00fc\u00e7\u00fck boyutlu olmas\u0131 nedeniyle, LED \u00e7ip s\u0131cakl\u0131\u011f\u0131na eklem s\u0131cakl\u0131\u011f\u0131 olarak da bak\u0131labilir. ><\/p>\n

2. LED eklem s\u0131cakl\u0131\u011f\u0131n\u0131n nedenleri nelerdir? ><\/p>\n

LED \u00e7al\u0131\u015fmas\u0131 eklem s\u0131cakl\u0131\u011f\u0131n\u0131 art\u0131ran be\u015f \u015feyi tetikler: ><\/p>\n

A. \u00f6ge elektrot yap\u0131s\u0131 k\u00f6t\u00fc, pencere kat\u0131, altl\u0131k veya eklem alan\u0131 malzemesi ve g\u00fcm\u00fc\u015f iletken yap\u0131\u015ft\u0131r\u0131c\u0131 gibi belirli bir diren\u00e7 de\u011feri vard\u0131r, bu diren\u00e7ler engelleri birlikte ekleyerek LED \u00f6gesinin seri direncini olu\u015fturur. P-N eklem \u00fczerinden akan ak\u0131m, bu diren\u00e7ler \u00fczerinden de akt\u0131\u011f\u0131nda, Joule \u0131s\u0131s\u0131 \u00fcretilerek \u00e7ip s\u0131cakl\u0131\u011f\u0131n\u0131n veya eklem s\u0131cakl\u0131\u011f\u0131n\u0131n y\u00fckselmesine neden olur. ><\/p>\n

B. P-N eklemi m\u00fckemmel olamayaca\u011f\u0131ndan, \u00f6genin enjeksiyon verimi 0'e ula\u015fmaz, yani LED \u00e7al\u0131\u015fmas\u0131 s\u0131ras\u0131nda P b\u00f6lgesinden N b\u00f6lgesine enjekte edilen y\u00fckler (delikler) d\u0131\u015f\u0131nda, N b\u00f6lgesinden de P b\u00f6lgesine y\u00fck (elektronlar) enjekte edilir; normal ko\u015fullarda, bu son y\u00fck enjeksiyonu fotoelektrik etkiyi \u00fcretmez ve \u0131s\u0131 formunda t\u00fcketilir. Enjekte edilen y\u00fck\u00fcn faydal\u0131 k\u0131sm\u0131n\u0131n bile tamam\u0131 \u0131\u015f\u0131\u011fa d\u00f6n\u00fc\u015fmez, eklem b\u00f6lgesindeki safs\u0131zl\u0131klara veya kusurlarla birle\u015ferek sonunda \u0131s\u0131ya d\u00f6n\u00fc\u015f\u00fcr. ><\/p>\n

C. Pratik, \u0131\u015f\u0131k verimlili\u011finin s\u0131n\u0131r\u0131n\u0131n LED eklem s\u0131cakl\u0131\u011f\u0131ndaki y\u00fckselmenin ana nedeni oldu\u011funu kan\u0131tlam\u0131\u015ft\u0131r. \u015eu anda, geli\u015fmi\u015f malzemelerin ve bile\u015fen imalat s\u00fcre\u00e7lerinin b\u00fcy\u00fcmesi, LED'lerin girdi enerjisinin b\u00fcy\u00fck \u00e7o\u011funlu\u011funun \u0131\u015f\u0131k \u0131\u015f\u0131mas\u0131na d\u00f6n\u00fc\u015ft\u00fcr\u00fclmesini m\u00fcmk\u00fcn k\u0131lacakt\u0131r. Ancak, LED \u00e7ipi malzemesinin \u00e7evresel ortamla \u00e7ok daha y\u00fcksek bir k\u0131r\u0131lma indisine sahip olmas\u0131 nedeniyle, kutup \u00e7ip i\u00e7inde \u00fcretilen fotonlar\u0131n \u00e7o\u011fu (> ) ba\u015far\u0131yla aray\u00fczden ta\u015famaz; \u00e7ip ve ortam aray\u00fcz\u00fcnde tam yans\u0131ma meydana gelir, fotonlar \u00e7ipin i\u00e7ine geri d\u00f6ner ve \u00e7ip malzemesi veya taban taraf\u0131ndan \u00e7oklu i\u00e7 yans\u0131malar yoluyla sonunda emilir, \u0131zgara titre\u015fimi bi\u00e7iminde \u0131s\u0131ya d\u00f6n\u00fc\u015ferek eklem s\u0131cakl\u0131\u011f\u0131ndaki y\u00fckselmeye yol a\u00e7ar. ><\/p>\n

D. G\u00f6r\u00fcn\u00fc\u015fe g\u00f6re, LED eleman\u0131n\u0131n \u0131s\u0131 da\u011f\u0131tma kapasitesi, ba\u011flant\u0131 noktas\u0131 s\u0131cakl\u0131\u011f\u0131n\u0131n y\u00fcksekli\u011fini veya d\u00fc\u015f\u00fckl\u00fc\u011f\u00fcn\u00fc belirleyen kritik bir ko\u015fuldur. Ba\u011flant\u0131 noktas\u0131 s\u0131cakl\u0131\u011f\u0131 d\u00fc\u015ft\u00fc\u011f\u00fcnde so\u011futma kapasitesi artar, tam tersine so\u011futma kapasitesi yetersiz kald\u0131\u011f\u0131nda ba\u011flant\u0131 noktas\u0131 s\u0131cakl\u0131\u011f\u0131 y\u00fckselir. Epoksi yap\u0131\u015ft\u0131r\u0131c\u0131 d\u00fc\u015f\u00fck termal iletkenli\u011fe sahip bir malzeme oldu\u011fundan, P-N ba\u011flant\u0131 noktas\u0131nda \u00fcretilen \u0131s\u0131, \u015feffaf epoksi arac\u0131l\u0131\u011f\u0131yla \u00e7evreye do\u011fru yukar\u0131 y\u00f6nde da\u011f\u0131lmakta zorlanmaktad\u0131r; \u0131s\u0131\u7684\u5927\u90e8\u5206u taban, g\u00fcm\u00fc\u015f macun, kabuk ve t\u00fcp ile epoksi yap\u0131\u015ft\u0131r\u0131c\u0131 katmanlar\u0131, PCB ve \u0131s\u0131 hepsinden a\u015fa\u011f\u0131 y\u00f6nde yay\u0131lmaktad\u0131r. A\u015fik\u00e2r ki, \u0131s\u0131 iletimine ili\u015fkin malzemelerin yetene\u011fi, bile\u015fenlerin \u0131s\u0131 kayb\u0131 verimlili\u011fini do\u011frudan etkileyecektir. Ortak tip bir LED'de, P-N ba\u011flant\u0131 noktas\u0131 b\u00f6lgesinden ortam s\u0131cakl\u0131\u011f\u0131na kadar toplam termal diren\u00e7 300 ila 600 \u00b0C\/W aras\u0131ndad\u0131r; iyi bir yap\u0131ya sahip g\u00fc\u00e7 tipi bir LED eleman\u0131nda toplam diren\u00e7 yakla\u015f\u0131k 15 ila 30 \u00b0C\/W'dir. Ortak tip LED elemanlar\u0131ndaki devasa termal diren\u00e7 fark\u0131, yaln\u0131zca \u00e7ok k\u00fc\u00e7\u00fck giri\u015f g\u00fc\u00e7 ko\u015fullar\u0131nda uygun \u015fekilde \u00e7al\u0131\u015fabilmelerini sa\u011flamaktad\u0131r; g\u00fc\u00e7 bile\u015fenlerinin \u0131s\u0131 da\u011f\u0131l\u0131m\u0131, daha y\u00fcksek watt seviyesine dahi yeterince b\u00fcy\u00fck olabilir. <\/p>\n

\"LED
LED Ba\u011flant\u0131 Noktas\u0131 Testi <\/figcaption><\/figure>\n

3. LED ba\u011flant\u0131 noktas\u0131 s\u0131cakl\u0131\u011f\u0131 azalt\u0131lmal\u0131 m\u0131? <\/p>\n

A. LED'nin kendinin termal direncini azaltmak; <\/p>\n

B. iyi bir ikincil so\u011futma mekanizmas\u0131; <\/p>\n

C. LED ile kurulan ikincil so\u011futma mekanizmas\u0131 aras\u0131ndaki aray\u00fczdeki termal direnci azaltmak; <\/p>\n

D. Nominal giri\u015f g\u00fcc\u00fcn\u00fc kontrol etmek; <\/p>\n

E. D\u00fc\u015f\u00fck ortam s\u0131cakl\u0131\u011f\u0131 <\/p>\n

LED giri\u015f g\u00fcc\u00fc, eleman\u0131n \u0131s\u0131 etkisinin tek kayna\u011f\u0131d\u0131r; enerjinin bir k\u0131sm\u0131 \u0131\u015f\u0131k enerjisi olarak yans\u0131ma h\u00e2linde kullan\u0131l\u0131r, geri kalan\u0131 ise nihayetinde \u0131s\u0131ya d\u00f6n\u00fc\u015ferek eleman\u0131n s\u0131cakl\u0131\u011f\u0131n\u0131 y\u00fckseltir. A\u015fik\u00e2r ki, LED \u0131s\u0131 etkisini azaltman\u0131n ana y\u00f6ntemi, bile\u015fenlerin elektro-optik d\u00f6n\u00fc\u015ft\u00fcrme verimini (d\u0131\u015f kuantum verimi olarak da bilinir) iyile\u015ftirmeye \u00e7al\u0131\u015farak, giri\u015f g\u00fcc\u00fcn\u00fcn m\u00fcmk\u00fcn olan en b\u00fcy\u00fck k\u0131sm\u0131n\u0131n \u0131\u015f\u0131k enerjisine d\u00f6n\u00fc\u015fmesini sa\u011flamakt\u0131r; bir di\u011fer \u00f6nemli yol ise bile\u015fenlerin \u0131s\u0131 da\u011f\u0131tma kapasitesini iyile\u015ftirmeye \u00e7al\u0131\u015fmak, b\u00f6ylece ba\u011flant\u0131 noktas\u0131nda \u00fcretilen \u0131s\u0131, \u00e7e\u015fitli yollarla \u00e7evredeki ortama da\u011f\u0131labilir. <\/p>","protected":false},"excerpt":{"rendered":"

1. What is LED junction temperature? The basic structure of the LED is a semiconductor P-N junction. The experiments indicate that the P-N junction temperature will rise, and when the current flows through the LED element, the strict sense, put the P-N junction region of temperature is defined as the junction temperature of the LED. […]<\/p>\n","protected":false},"author":6,"featured_media":12602,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-12601","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-and-blog"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/posts\/12601","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/comments?post=12601"}],"version-history":[{"count":2,"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/posts\/12601\/revisions"}],"predecessor-version":[{"id":12605,"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/posts\/12601\/revisions\/12605"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/media\/12602"}],"wp:attachment":[{"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/media?parent=12601"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/categories?post=12601"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iled-lights.com\/tr\/wp-json\/wp\/v2\/tags?post=12601"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}