![\"Thi\u1ebft](\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/thiet_ke_tan_nhiet_cho_den_led.png\")
<\/p>\nThi\u1ebft k\u1ebf t\u1ea3n nhi\u1ec7t cho \u0111\u00e8n LED: Hi\u1ec3u c\u01a1 ch\u1ebf l\u00e0m m\u00e1t, l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u v\u00e0 k\u1ef9 thu\u1eadt t\u1ed1i \u01b0u \u0111\u1ec3 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a \u0111\u00e8n LED.<\/p>\n
<\/p>\n
\u0110\u00e8n LED (Light Emitting Diode) hi\u1ec7n \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1edd v\u00e0o hi\u1ec7u qu\u1ea3 n\u0103ng l\u01b0\u1ee3ng v\u00e0 tu\u1ed5i th\u1ecd cao. Tuy nhi\u00ean, gi\u1ed1ng nh\u01b0 b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed n\u00e0o kh\u00e1c, \u0111\u00e8n LED c\u0169ng t\u1ecfa nhi\u1ec7t trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng. N\u1ebfu kh\u00f4ng c\u00f3 h\u1ec7 th\u1ed1ng t\u1ea3n nhi\u1ec7t hi\u1ec7u qu\u1ea3, nhi\u1ec7t \u0111\u1ed9 qu\u00e1 cao c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a \u0111\u00e8n. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1ch thi\u1ebft k\u1ebf t\u1ea3n nhi\u1ec7t cho \u0111\u00e8n LED.<\/p>\n
C\u00f3 nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 t\u1ea3n nhi\u1ec7t cho \u0111\u00e8n LED, bao g\u1ed3m:<\/p>\n
\u0110\u1ec3 thi\u1ebft k\u1ebf t\u1ea3n nhi\u1ec7t hi\u1ec7u qu\u1ea3, ta c\u1ea7n hi\u1ec3u v\u00e0 s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n. C\u00f4ng th\u1ee9c n\u1ed5i ti\u1ebfng nh\u1ea5t l\u00e0 ph\u01b0\u01a1ng tr\u00ecnh Fourier cho d\u00f2ng nhi\u1ec7t:<\/p>\n
\n\\[ q = -k \\cdot A \\cdot \\frac{dT}{dx} \\]\n<\/p>\n
Trong \u0111\u00f3:<\/p>\n
Gi\u1ea3 s\u1eed ch\u00fang ta c\u00f3 m\u1ed9t \u0111\u00e8n LED v\u1edbi m\u1ee9c c\u00f4ng su\u1ea5t 10W. Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng l\u00e0 25\u00b0C v\u00e0 ch\u00fang ta mu\u1ed1n nhi\u1ec7t \u0111\u1ed9 c\u1ee7a \u0111\u00e8n LED kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 60\u00b0C. \u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111i\u1ec1u n\u00e0y, ta c\u1ea7n thi\u1ebft k\u1ebf c\u00e1nh t\u1ea3n nhi\u1ec7t ph\u00f9 h\u1ee3p. Gi\u1ea3 s\u1eed ta ch\u1ecdn nh\u00f4m v\u1edbi h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t k = 205 W\/m\u00b7K v\u00e0 di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t t\u1ea3n nhi\u1ec7t l\u00e0 0.02 m\u00b2.<\/p>\n
\n\\[ q = k \\cdot A \\cdot \\frac{dT}{dx} \\]\n\\]\n
V\u1edbi \\(\\frac{dT}{dx}\\) ch\u00ednh l\u00e0 \\(\\frac{60 – 25}{d}\\), trong \u0111\u00f3 d l\u00e0 \u0111\u1ed9 d\u00e0y c\u1ee7a c\u00e1nh t\u1ea3n nhi\u1ec7t.<\/p>\n
Nh\u01b0 v\u1eady, thi\u1ebft k\u1ebf c\u00e1nh t\u1ea3n nhi\u1ec7t nh\u00f4m nh\u01b0 tr\u00ean s\u1ebd gi\u00fap l\u00e0m m\u00e1t m\u1ed9t \u0111\u00e8n LED 10W m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n
V\u1edbi c\u00e1c th\u00f4ng tin tr\u00ean, hy v\u1ecdng b\u1ea1n \u0111\u00e3 c\u00f3 m\u1ed9t c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 thi\u1ebft k\u1ebf t\u1ea3n nhi\u1ec7t cho \u0111\u00e8n LED, gi\u00fap t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t v\u00e0 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a \u0111\u00e8n. H\u00e3y \u00e1p d\u1ee5ng nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y khi thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng \u0111\u00e8n LED trong th\u1ef1c t\u1ebf.<\/p>\n","protected":false},"excerpt":{"rendered":"
Thi\u1ebft k\u1ebf t\u1ea3n nhi\u1ec7t cho \u0111\u00e8n LED: Hi\u1ec3u c\u01a1 ch\u1ebf l\u00e0m m\u00e1t, l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u v\u00e0 k\u1ef9 thu\u1eadt t\u1ed1i \u01b0u \u0111\u1ec3 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a \u0111\u00e8n LED.<\/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":"\n