{"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\/vi\/what-is-led-junction-temperature-and-how-to-reduce-it-a10.html","title":{"rendered":"Nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp gi\u00e1p LED l\u00e0 g\u00ec v\u00e0 c\u00e1ch gi\u1ea3m n\u00f3"},"content":{"rendered":"

1. Nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp gi\u00e1p LED l\u00e0 g\u00ec?<\/p>\n

C\u1ea5u tr\u00fac c\u01a1 b\u1ea3n c\u1ee7a LED l\u00e0 ti\u1ebfp gi\u00e1p b\u00e1n d\u1eabn P-N. C\u00e1c th\u00ed nghi\u1ec7m cho th\u1ea5y nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp gi\u00e1p P-N s\u1ebd t\u0103ng l\u00ean, v\u00e0 khi d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua th\u00e0nh ph\u1ea7n LED, v\u1ec1 m\u1eb7t nghi\u00eam ng\u1eb7t, v\u00f9ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a ti\u1ebfp gi\u00e1p P-N \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp gi\u00e1p c\u1ee7a LED. Th\u00f4ng th\u01b0\u1eddng, do c\u00e1c chip th\u00e0nh ph\u1ea7n c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf, v\u00ec v\u1eady ch\u00fang ta c\u0169ng c\u00f3 th\u1ec3 coi nhi\u1ec7t \u0111\u1ed9 c\u1ee7a chip LED l\u00e0 nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp gi\u00e1p.<\/p>\n

2. Nh\u1eefng nguy\u00ean nh\u00e2n n\u00e0o g\u00e2y ra nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i LED?<\/p>\n

C\u00e1c y\u1ebfu t\u1ed1 l\u00e0m t\u0103ng nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i khi LED ho\u1ea1t \u0111\u1ed9ng bao g\u1ed3m n\u0103m \u0111i\u1ec3m sau:<\/p>\n

A. C\u1ea5u tr\u00fac \u0111i\u1ec7n c\u1ef1c k\u00e9m c\u1ee7a linh ki\u1ec7n, l\u1edbp c\u1eeda s\u1ed5, ch\u1ea5t b\u00e1n d\u1eabn c\u01a1 s\u1edf ho\u1eb7c v\u00f9ng li\u00ean k\u1ebft v\u1eadt li\u1ec7u v\u00e0 ch\u1ea5t d\u00e1n d\u1eabn b\u1ea1c c\u00f3 m\u1ed9t gi\u00e1 tr\u1ecb \u0111i\u1ec7n kh\u00e1ng nh\u1ea5t \u0111\u1ecbnh. C\u00e1c \u0111i\u1ec7n kh\u00e1ng n\u00e0y \u0111\u01b0\u1ee3c c\u1ed9ng d\u1ed3n t\u1ea1o th\u00e0nh \u0111i\u1ec7n tr\u1edf n\u1ed1i ti\u1ebfp c\u1ee7a linh ki\u1ec7n LED. Khi d\u00f2ng \u0111i\u1ec7n ch\u1ea3y qua m\u1ed1i n\u1ed1i P-N, n\u00f3 c\u0169ng ch\u1ea3y qua c\u00e1c \u0111i\u1ec7n kh\u00e1ng n\u00e0y, sinh ra nhi\u1ec7t Joule, d\u1eabn \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 chip ho\u1eb7c nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i t\u0103ng l\u00ean.<\/p>\n

B. Do m\u1ed1i n\u1ed1i P-N kh\u00f4ng th\u1ec3 ho\u00e0n h\u1ea3o tuy\u1ec7t \u0111\u1ed1i, hi\u1ec7u su\u1ea5t ti\u00eam c\u1ee7a linh ki\u1ec7n kh\u00f4ng \u0111\u1ea1t 100%. N\u00f3i c\u00e1ch kh\u00e1c, ngo\u00e0i vi\u1ec7c c\u00e1c \u0111i\u1ec7n t\u00edch (l\u1ed7 tr\u1ed1ng) \u0111\u01b0\u1ee3c ti\u00eam t\u1eeb v\u00f9ng P sang v\u00f9ng N, c\u00e1c \u0111i\u1ec7n t\u00edch (electron) t\u1eeb v\u00f9ng N c\u0169ng \u0111\u01b0\u1ee3c ti\u00eam sang v\u00f9ng P. Trong \u0111i\u1ec1u ki\u1ec7n b\u00ecnh th\u01b0\u1eddng, qu\u00e1 tr\u00ecnh ti\u00eam \u0111i\u1ec7n t\u00edch n\u00e0y kh\u00f4ng t\u1ea1o ra hi\u1ec7u \u1ee9ng quang \u0111i\u1ec7n m\u00e0 b\u1ecb ti\u00eau th\u1ee5 d\u01b0\u1edbi d\u1ea1ng nhi\u1ec7t. Ngay c\u1ea3 ph\u1ea7n \u0111i\u1ec7n t\u00edch h\u1eefu \u00edch \u0111\u01b0\u1ee3c ti\u00eam, kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 \u0111\u1ec1u chuy\u1ec3n th\u00e0nh \u00e1nh s\u00e1ng; m\u1ed9t ph\u1ea7n t\u00e1i h\u1ee3p t\u1ea1i c\u00e1c t\u1ea1p ch\u1ea5t ho\u1eb7c khuy\u1ebft t\u1eadt trong v\u00f9ng li\u00ean k\u1ebft v\u00e0 cu\u1ed1i c\u00f9ng bi\u1ebfn \u0111\u1ed5i th\u00e0nh nhi\u1ec7t.<\/p>\n

C. Th\u1ef1c ti\u1ec5n \u0111\u00e3 ch\u1ee9ng minh r\u1eb1ng gi\u1edbi h\u1ea1n hi\u1ec7u su\u1ea5t ph\u00e1t s\u00e1ng l\u00e0 nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y ra s\u1ef1 t\u0103ng nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i LED. Hi\u1ec7n t\u1ea1i, s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u ti\u00ean ti\u1ebfn v\u00e0 quy tr\u00ecnh s\u1ea3n xu\u1ea5t linh ki\u1ec7n s\u1ebd cho ph\u00e9p ph\u1ea7n l\u1edbn n\u0103ng l\u01b0\u1ee3ng \u0111\u1ea7u v\u00e0o c\u1ee7a LED \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh b\u1ee9c x\u1ea1 \u00e1nh s\u00e1ng. Tuy nhi\u00ean, do chi\u1ebft su\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u chip LED v\u00e0 m\u00f4i tr\u01b0\u1eddng xung quanh ch\u00eanh l\u1ec7ch qu\u00e1 l\u1edbn, khi\u1ebfn ph\u1ea7n l\u1edbn c\u00e1c photon ( 90%) sinh ra b\u00ean trong chip kh\u00f4ng th\u1ec3 tho\u00e1t ra qua b\u1ec1 m\u1eb7t giao di\u1ec7n, x\u1ea3y ra ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n t\u1ea1i giao di\u1ec7n gi\u1eefa chip v\u00e0 m\u00f4i tr\u01b0\u1eddng, c\u00e1c photon n\u00e0y quay l\u1ea1i b\u00ean trong chip v\u00e0 sau nhi\u1ec1u l\u1ea7n ph\u1ea3n x\u1ea1 b\u00ean trong cu\u1ed1i c\u00f9ng b\u1ecb v\u1eadt li\u1ec7u chip ho\u1eb7c ch\u1ea5t n\u1ec1n h\u1ea5p th\u1ee5, chuy\u1ec3n th\u00e0nh nhi\u1ec7t d\u01b0\u1edbi d\u1ea1ng dao \u0111\u1ed9ng m\u1ea1ng tinh th\u1ec3, l\u00e0m t\u0103ng nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i.<\/p>\n

D. R\u00f5 r\u00e0ng l\u00e0, kh\u1ea3 n\u0103ng t\u1ea3n nhi\u1ec7t c\u1ee7a th\u00e0nh ph\u1ea7n LED l\u00e0 \u0111i\u1ec1u ki\u1ec7n then ch\u1ed1t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp n\u1ed1i cao hay th\u1ea5p. Khi nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp n\u1ed1i gi\u1ea3m, n\u0103ng l\u1ef1c l\u00e0m m\u00e1t s\u1ebd t\u0103ng, ng\u01b0\u1ee3c l\u1ea1i, khi n\u0103ng l\u1ef1c l\u00e0m m\u00e1t th\u1ea5p, nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp n\u1ed1i s\u1ebd t\u0103ng. V\u00ec keo epoxy l\u00e0 v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p, do \u0111\u00f3 nhi\u1ec7t \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1ea1i v\u00f9ng ti\u1ebfp n\u1ed1i P-N kh\u00f3 c\u00f3 th\u1ec3 truy\u1ec1n qua l\u1edbp epoxy trong su\u1ed1t h\u01b0\u1edbng l\u00ean \u0111\u1ec3 t\u1ecfa ra m\u00f4i tr\u01b0\u1eddng, m\u00e0 ph\u1ea7n l\u1edbn nhi\u1ec7t s\u1ebd \u0111\u01b0\u1ee3c truy\u1ec1n xu\u1ed1ng qua \u0111\u1ebf, l\u1edbp keo b\u1ea1c, v\u1ecf v\u00e0 \u1ed1ng, l\u1edbp keo epoxy, bo m\u1ea1ch (PCB) v\u00e0 b\u1ed9 t\u1ea3n nhi\u1ec7t. R\u00f5 r\u00e0ng l\u00e0 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u li\u00ean quan s\u1ebd \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c m\u1ea5t nhi\u1ec7t c\u1ee7a linh ki\u1ec7n. \u0110\u1ed1i v\u1edbi m\u1ed9t lo\u1ea1i LED th\u00f4ng th\u01b0\u1eddng, \u0111i\u1ec7n tr\u1edf nhi\u1ec7t t\u1ed5ng c\u1ed9ng t\u1eeb v\u00f9ng ti\u1ebfp n\u1ed1i P-N \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng n\u1eb1m trong kho\u1ea3ng t\u1eeb 300 \u0111\u1ebfn 600 \u00b0C\/W. \u0110\u1ed1i v\u1edbi th\u00e0nh ph\u1ea7n LED c\u00f4ng su\u1ea5t c\u00f3 c\u1ea5u tr\u00fac t\u1ed1t, \u0111i\u1ec7n tr\u1edf t\u1ed5ng c\u1ed9ng kho\u1ea3ng 15 \u0111\u1ebfn 30 \u2103\/W. S\u1ef1 kh\u00e1c bi\u1ec7t l\u1edbn v\u1ec1 \u0111i\u1ec7n tr\u1edf nhi\u1ec7t khi\u1ebfn c\u00e1c th\u00e0nh ph\u1ea7n LED th\u00f4ng th\u01b0\u1eddng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang khi \u1edf \u0111i\u1ec1u ki\u1ec7n c\u00f4ng su\u1ea5t \u0111\u1ea7u v\u00e0o r\u1ea5t nh\u1ecf; \u0111i\u1ec7n tr\u1edf nhi\u1ec7t c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n c\u00f4ng su\u1ea5t c\u00f3 th\u1ec3 \u0111\u1ee7 l\u1edbn \u0111\u1ec3 \u0111\u1ea1t m\u1ee9c watt cao h\u01a1n.<\/p>\n

\"Ki\u1ec3m
Ki\u1ec3m tra ti\u1ebfp n\u1ed1i LED<\/figcaption><\/figure>\n

3. Gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp n\u1ed1i LED?<\/p>\n

A. gi\u1ea3m \u0111i\u1ec7n tr\u1edf nhi\u1ec7t c\u1ee7a ch\u00ednh LED;<\/p>\n

B. c\u01a1 ch\u1ebf l\u00e0m m\u00e1t th\u1ee9 c\u1ea5p t\u1ed1t;<\/p>\n

C. \u0110\u1ec3 gi\u1ea3m \u0111i\u1ec7n tr\u1edf nhi\u1ec7t gi\u1eefa LED v\u00e0 c\u01a1 ch\u1ebf l\u00e0m m\u00e1t th\u1ee9 c\u1ea5p, giao di\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t;<\/p>\n

D. Ki\u1ec3m so\u00e1t c\u00f4ng su\u1ea5t \u0111\u1ea7u v\u00e0o \u0111\u1ecbnh m\u1ee9c;<\/p>\n

E. Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng th\u1ea5p h\u01a1n<\/p>\n

C\u00f4ng su\u1ea5t \u0111\u1ea7u v\u00e0o LED l\u00e0 ngu\u1ed3n duy nh\u1ea5t c\u1ee7a hi\u1ec7u \u1ee9ng nhi\u1ec7t c\u1ee7a ph\u1ea7n t\u1eed, m\u1ed9t ph\u1ea7n n\u0103ng l\u01b0\u1ee3ng chuy\u1ec3n th\u00e0nh b\u1ee9c x\u1ea1 n\u0103ng l\u01b0\u1ee3ng \u00e1nh s\u00e1ng, ph\u1ea7n c\u00f2n l\u1ea1i cu\u1ed1i c\u00f9ng chuy\u1ec3n th\u00e0nh nhi\u1ec7t, do \u0111\u00f3 l\u00e0m t\u0103ng nhi\u1ec7t \u0111\u1ed9 c\u1ee7a ph\u1ea7n t\u1eed. R\u00f5 r\u00e0ng, ph\u01b0\u01a1ng ph\u00e1p ch\u00ednh \u0111\u1ec3 gi\u1ea3m hi\u1ec7u \u1ee9ng nhi\u1ec7t c\u1ee7a LED l\u00e0 c\u1ed1 g\u1eafng c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t chuy\u1ec3n \u0111\u1ed5i \u0111i\u1ec7n-quang c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n (c\u00f2n g\u1ecdi l\u00e0 hi\u1ec7u su\u1ea5t l\u01b0\u1ee3ng t\u1eed b\u00ean ngo\u00e0i), \u0111\u1ec3 c\u00e0ng nhi\u1ec1u c\u00f4ng su\u1ea5t \u0111\u1ea7u v\u00e0o chuy\u1ec3n th\u00e0nh n\u0103ng l\u01b0\u1ee3ng \u00e1nh s\u00e1ng, c\u00e1ch quan tr\u1ecdng kh\u00e1c l\u00e0 c\u1ed1 g\u1eafng c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng t\u1ea3n nhi\u1ec7t c\u1ee7a c\u00e1c th\u00e0nh ph\u1ea7n, \u0111\u1ec3 nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i sinh ra nhi\u1ec7t chuy\u1ec3n v\u00e0o m\u00f4i tr\u01b0\u1eddng xung quanh, th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng ti\u1ec7n kh\u00e1c nhau \u0111\u1ec3 ph\u00e2n b\u1ed5.<\/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\/vi\/wp-json\/wp\/v2\/posts\/12601","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/comments?post=12601"}],"version-history":[{"count":2,"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/posts\/12601\/revisions"}],"predecessor-version":[{"id":12605,"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/posts\/12601\/revisions\/12605"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/media\/12602"}],"wp:attachment":[{"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/media?parent=12601"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/categories?post=12601"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iled-lights.com\/vi\/wp-json\/wp\/v2\/tags?post=12601"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}