{"id":674143,"date":"2024-08-15T11:30:21","date_gmt":"2024-08-15T10:30:21","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=674143"},"modified":"2024-08-15T11:30:21","modified_gmt":"2024-08-15T10:30:21","slug":"quan-ly-nhiet-cho-he-thong-den-led","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/quan-ly-nhiet-cho-he-thong-den-led\/","title":{"rendered":"Qu\u1ea3n l\u00fd nhi\u1ec7t cho h\u1ec7 th\u1ed1ng \u0111\u00e8n LED"},"content":{"rendered":"

Qu\u1ea3n l\u00fd nhi\u1ec7t cho h\u1ec7 th\u1ed1ng \u0111\u00e8n LED gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd v\u00e0 hi\u1ec7u su\u1ea5t chi\u1ebfu s\u00e1ng b\u1eb1ng c\u00e1ch t\u1ed1i \u01b0u h\u00f3a t\u1ea3n nhi\u1ec7t v\u00e0 thi\u1ebft k\u1ebf hi\u1ec7u qu\u1ea3.<\/p>\n

\"Qu\u1ea3n<\/p>\n

Qu\u1ea3n l\u00fd nhi\u1ec7t cho h\u1ec7 th\u1ed1ng \u0111\u00e8n LED<\/h2>\n

\u0110\u00e8n LED (Light Emitting Diode) \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu trong chi\u1ebfu s\u00e1ng hi\u1ec7n \u0111\u1ea1i nh\u1edd v\u00e0o hi\u1ec7u su\u1ea5t n\u0103ng l\u01b0\u1ee3ng cao v\u00e0 tu\u1ed5i th\u1ecd d\u00e0i. Tuy nhi\u00ean, qu\u1ea3n l\u00fd nhi\u1ec7t l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng m\u00e0 ch\u00fang ta kh\u00f4ng th\u1ec3 b\u1ecf qua khi s\u1eed d\u1ee5ng \u0111\u00e8n LED. N\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd nhi\u1ec7t \u0111\u00fang c\u00e1ch, \u0111\u00e8n LED c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng, gi\u1ea3m tu\u1ed5i th\u1ecd v\u00e0 hi\u1ec7u su\u1ea5t chi\u1ebfu s\u00e1ng.<\/p>\n

Nguy\u00ean nh\u00e2n g\u00e2y nhi\u1ec7t trong \u0111\u00e8n LED<\/h2>\n

\u0110\u00e8n LED chuy\u1ec3n \u0111\u1ed5i \u0111i\u1ec7n n\u0103ng th\u00e0nh \u00e1nh s\u00e1ng th\u00f4ng qua c\u00e1c qu\u00e1 tr\u00ecnh \u0111i\u1ec7n t\u1eed. Tuy nhi\u00ean, kh\u00f4ng ph\u1ea3i to\u00e0n b\u1ed9 n\u0103ng l\u01b0\u1ee3ng n\u00e0y \u0111\u1ec1u chuy\u1ec3n \u0111\u1ed5i th\u00e0nh \u00e1nh s\u00e1ng; m\u1ed9t ph\u1ea7n l\u1edbn c\u00f2n l\u1ea1i chuy\u1ec3n h\u00f3a th\u00e0nh nhi\u1ec7t. S\u1ef1 t\u0103ng nhi\u1ec7t n\u00e0y ch\u1ee7 y\u1ebfu xu\u1ea5t ph\u00e1t t\u1eeb hai qu\u00e1 tr\u00ecnh:<\/p>\n

<\/p>\n

  • S\u1ef1 gi\u1ea3m \u0111i\u1ec7n \u00e1p tr\u00ean m\u1ea1ch LED (Junction Voltage Drop).<\/li>\n
  • S\u1ef1 ph\u00e1t nhi\u1ec7t t\u1eeb c\u00e1c th\u00e0nh ph\u1ea7n \u0111i\u1ec7n t\u1eed kh\u00e1c nhau trong m\u1ea1ch.<\/li>\n

    <\/u1><\/p>\n

    C\u00e1c ph\u01b0\u01a1ng ph\u00e1p qu\u1ea3n l\u00fd nhi\u1ec7t<\/h2>\n

    \u0110\u1ec3 qu\u1ea3n l\u00fd nhi\u1ec7t cho \u0111\u00e8n LED, c\u00f3 m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, bao g\u1ed3m:<\/p>\n

    <\/p>\n

  • L\u00e0m m\u00e1t t\u1ef1 nhi\u00ean:<\/b> S\u1eed d\u1ee5ng c\u00e1c khung nh\u00f4m v\u00e0 b\u1ec1 m\u1eb7t t\u1ea3n nhi\u1ec7t \u0111\u1ec3 gi\u1ea3i t\u1ecfa nhi\u1ec7t.<\/li>\n
  • L\u00e0m m\u00e1t c\u01b0\u1ee1ng b\u1ee9c:<\/b> S\u1eed d\u1ee5ng qu\u1ea1t ho\u1eb7c b\u01a1m nhi\u1ec7t \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng gi\u1ea3i nhi\u1ec7t.<\/li>\n
  • Thay \u0111\u1ed5i thi\u1ebft k\u1ebf m\u1ea1ch:<\/b> T\u1ed1i \u01b0u h\u00f3a c\u00e1ch b\u1ed1 tr\u00ed v\u00e0 thi\u1ebft k\u1ebf m\u1ea1ch \u0111\u1ec3 gi\u1ea3m nhi\u1ec7t sinh ra.<\/li>\n
  • S\u1eed d\u1ee5ng v\u1eadt li\u1ec7u l\u00e0m m\u00e1t:<\/b> \u00c1p d\u1ee5ng c\u00e1c v\u1eadt li\u1ec7u c\u00f3 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t t\u1ed1t \u0111\u1ec3 t\u1ea3n nhi\u1ec7t nhanh h\u01a1n.<\/li>\n

    <\/u1><\/p>\n

    T\u1ea7m quan tr\u1ecdng c\u1ee7a t\u1ea3n nhi\u1ec7t trong d\u00e0i h\u1ea1n<\/h2>\n

    N\u1ebfu qu\u1ea3n l\u00fd nhi\u1ec7t t\u1ed1t, \u0111\u00e8n LED s\u1ebd c\u00f3 tu\u1ed5i th\u1ecd trung b\u00ecnh cao, gi\u1ea3m thi\u1ec3u nguy c\u01a1 h\u1ecfng h\u00f3c. Nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng th\u1ea5p c\u0169ng gi\u00fap duy tr\u00ec hi\u1ec7u su\u1ea5t chi\u1ebfu s\u00e1ng c\u1ee7a \u0111\u00e8n LED \u1edf m\u1ee9c t\u1ed1i \u01b0u.<\/p>\n

    M\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n<\/h2>\n

    \u0110\u1ec3 x\u00e1c \u0111\u1ecbnh hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c qu\u1ea3n l\u00fd nhi\u1ec7t, ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n nh\u01b0:<\/p>\n

    C\u00f4ng th\u1ee9c t\u00ednh nhi\u1ec7t \u0111\u1ed9:<\/i><\/p>\n

    Tj<\/sub> = Ta<\/sub> + (R\u03b8JA<\/sub> * P)<\/b><\/p>\n

    Trong \u0111\u00f3:<\/p>\n

    <\/p>\n

  • Tj<\/sub><\/b>: Nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i (Junction Temperature).<\/li>\n
  • Ta<\/sub><\/b>: Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng (Ambient Temperature).<\/li>\n
  • R\u03b8JA<\/sub><\/b>: Kh\u00e1ng nhi\u1ec7t t\u1eeb m\u1ed1i n\u1ed1i \u0111\u1ebfn m\u00f4i tr\u01b0\u1eddng (Thermal Resistance Junction to Ambient).<\/li>\n
  • P<\/b>: C\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 (Power Dissipation).<\/li>\n

    <\/u1><\/p>\n

    B\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p qu\u1ea3n l\u00fd nhi\u1ec7t v\u00e0 hi\u1ec3u r\u00f5 v\u1ec1 c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng, ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u00e8n LED ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 v\u00e0 b\u1ec1n b\u1ec9 theo th\u1eddi gian.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Qu\u1ea3n l\u00fd nhi\u1ec7t cho h\u1ec7 th\u1ed1ng \u0111\u00e8n LED gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd v\u00e0 hi\u1ec7u su\u1ea5t chi\u1ebfu s\u00e1ng b\u1eb1ng c\u00e1ch t\u1ed1i \u01b0u h\u00f3a t\u1ea3n nhi\u1ec7t v\u00e0 thi\u1ebft k\u1ebf hi\u1ec7u qu\u1ea3.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"\nQu\u1ea3n l\u00fd nhi\u1ec7t cho h\u1ec7 th\u1ed1ng \u0111\u00e8n LED<\/title>\n<meta name=\"description\" content=\"Qu\u1ea3n l\u00fd nhi\u1ec7t cho h\u1ec7 th\u1ed1ng \u0111\u00e8n LED gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd v\u00e0 hi\u1ec7u su\u1ea5t chi\u1ebfu s\u00e1ng b\u1eb1ng c\u00e1ch t\u1ed1i \u01b0u h\u00f3a t\u1ea3n nhi\u1ec7t v\u00e0 thi\u1ebft k\u1ebf hi\u1ec7u qu\u1ea3.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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