{"id":702806,"date":"2024-07-24T01:13:50","date_gmt":"2024-07-24T00:13:50","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=702806"},"modified":"2024-07-24T01:13:50","modified_gmt":"2024-07-24T00:13:50","slug":"phan-tich-nhiet-cua-cac-thiet-bi-ban-dan","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/phan-tich-nhiet-cua-cac-thiet-bi-ban-dan\/","title":{"rendered":"Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn"},"content":{"rendered":"<p class=\"sidekick\">Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn: t\u00ecm hi\u1ec3u c\u00e1ch qu\u1ea3n l\u00fd v\u00e0 gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 trong thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed \u0111\u1ec3 n\u00e2ng cao hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/phan_tich_nhiet_cua_cac_thiet_bi_ban_dan.png\" alt=\"Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Ph\u00e2n T\u00edch Nhi\u1ec7t C\u1ee7a C\u00e1c Thi\u1ebft B\u1ecb B\u00e1n D\u1eabn<\/h2>\n<p>Trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t, ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a thi\u1ebft b\u1ecb. C\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn nh\u01b0 transistor, diode v\u00e0 m\u1ea1ch t\u00edch h\u1ee3p (IC) th\u01b0\u1eddng sinh ra r\u1ea5t nhi\u1ec1u nhi\u1ec7t trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng, l\u00e0m t\u0103ng nguy c\u01a1 h\u1ecfng h\u00f3c n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd t\u1ed1t. D\u01b0\u1edbi \u0111\u00e2y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1c kh\u00eda c\u1ea1nh quan tr\u1ecdng c\u1ee7a ph\u00e2n t\u00edch nhi\u1ec7t v\u00e0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p qu\u1ea3n l\u00fd nhi\u1ec7t hi\u1ec7u qu\u1ea3.<\/p>\n<h2>T\u1ea1i Sao Ph\u1ea3i Ph\u00e2n T\u00edch Nhi\u1ec7t?<\/h2>\n<ul>\n<li><b>Hi\u1ec7u Su\u1ea5t:<\/b> Nhi\u1ec7t \u0111\u1ed9 cao c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t ho\u1ea1t \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb b\u00e1n d\u1eabn, g\u00e2y ra c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng nh\u01b0 nhi\u1ec5u lo\u1ea1n t\u00edn hi\u1ec7u v\u00e0 gi\u1ea3m t\u1ed1c \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng.<\/li>\n<li><b>\u0110\u1ed9 B\u1ec1n:<\/b> Qu\u00e1 nhi\u1ec7t c\u00f3 th\u1ec3 g\u00e2y h\u1ecfng h\u00f3c t\u1ea1m th\u1eddi ho\u1eb7c v\u0129nh vi\u1ec5n cho thi\u1ebft b\u1ecb. Khi nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n cho ph\u00e9p, c\u1ea5u tr\u00fac c\u1ee7a v\u1eadt li\u1ec7u b\u00e1n d\u1eabn b\u1ecb t\u1ed5n th\u01b0\u01a1ng, d\u1eabn \u0111\u1ebfn gi\u1ea3m tu\u1ed5i th\u1ecd.<\/li>\n<li><b>An To\u00e0n:<\/b> Nhi\u1ec7t l\u01b0\u1ee3ng d\u01b0 th\u1eeba c\u00f3 th\u1ec3 g\u00e2y ra c\u00e1c v\u1ea5n \u0111\u1ec1 an to\u00e0n nh\u01b0 ch\u00e1y n\u1ed5, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng l\u1edbn.<\/li>\n<\/ul>\n<h2>C\u00e1c Y\u1ebfu T\u1ed1 \u1ea2nh H\u01b0\u1edfng \u0110\u1ebfn Nhi\u1ec7t \u0110\u1ed9<\/h2>\n<p>\u0110\u1ec3 ph\u00e2n t\u00edch nhi\u1ec7t, ch\u00fang ta c\u1ea7n xem x\u00e9t nhi\u1ec1u y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 c\u1ee7a thi\u1ebft b\u1ecb b\u00e1n d\u1eabn:<\/p>\n<ul>\n<li><b>C\u00f4ng Su\u1ea5t Ti\u00eau Th\u1ee5:<\/b> Nhi\u1ec7t \u0111\u1ed9 t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5. P = IV, n\u01a1i I l\u00e0 d\u00f2ng \u0111i\u1ec7n v\u00e0 V l\u00e0 \u0111i\u1ec7n \u00e1p.<\/li>\n<li><b>Kh\u1ea3 N\u0103ng T\u1ea3n Nhi\u1ec7t:<\/b> C\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ea3n nhi\u1ec7t nh\u01b0 qu\u1ea1t l\u00e0m m\u00e1t, t\u1ea3n nhi\u1ec7t d\u1eabn ho\u1eb7c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t b\u1eb1ng ch\u1ea5t l\u1ecfng.<\/li>\n<li><b>\u0110i\u1ec1u Ki\u1ec7n M\u00f4i Tr\u01b0\u1eddng:<\/b> Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng, \u0111\u1ed9 \u1ea9m v\u00e0 l\u01b0u l\u01b0\u1ee3ng kh\u00f4ng kh\u00ed c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn kh\u1ea3 n\u0103ng t\u1ea3n nhi\u1ec7t.<\/li>\n<\/ul>\n<h2>C\u00f4ng C\u1ee5 v\u00e0 K\u1ef9 Thu\u1eadt Ph\u00e2n T\u00edch Nhi\u1ec7t<\/h2>\n<p>C\u00f3 nhi\u1ec1u c\u00f4ng c\u1ee5 v\u00e0 k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e2n t\u00edch nhi\u1ec7t trong c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn:<\/p>\n<ul>\n<li><b>M\u00f4 Ph\u1ecfng Nhi\u1ec7t:<\/b> S\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m m\u00f4 ph\u1ecfng nhi\u1ec7t \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n ph\u00e2n b\u1ed1 nhi\u1ec7t \u0111\u1ed9 v\u00e0 ph\u00e2n t\u00edch c\u00e1c khu v\u1ef1c c\u00f3 nguy c\u01a1 qu\u00e1 nhi\u1ec7t.<\/li>\n<li><b>\u0110\u00e1nh Gi\u00e1 B\u1eb1ng Th\u1ef1c Nghi\u1ec7m:<\/b> S\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb \u0111o \u0111\u1ea1c nh\u01b0 c\u1eb7p nhi\u1ec7t \u0111i\u1ec7n (thermocouple) \u0111\u1ec3 \u0111o nhi\u1ec7t \u0111\u1ed9 th\u1ef1c t\u1ebf t\u1ea1i c\u00e1c \u0111i\u1ec3m quan tr\u1ecdng.<\/li>\n<li><b>Qu\u1ea3n L\u00fd Nhi\u1ec7t:<\/b> S\u1eed d\u1ee5ng c\u00e1c gi\u1ea3i ph\u00e1p qu\u1ea3n l\u00fd nhi\u1ec7t nh\u01b0 l\u1eafp \u0111\u1eb7t qu\u1ea1t l\u00e0m m\u00e1t, t\u1ea3n nhi\u1ec7t d\u1eabn ho\u1eb7c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t b\u1eb1ng ch\u1ea5t l\u1ecfng.<\/li>\n<\/ul>\n<h2>C\u00f4ng Th\u1ee9c \u0110\u1ec3 T\u00ednh To\u00e1n Nhi\u1ec7t \u0110\u1ed9<\/h2>\n<p>M\u1ed9t trong nh\u1eefng c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n \u0111\u1ec3 t\u00ednh to\u00e1n nhi\u1ec7t \u0111\u1ed9 trong thi\u1ebft b\u1ecb b\u00e1n d\u1eabn l\u00e0:<\/p>\n<ul>\n<li>T_{j} = T_{a} + \\frac{P_{d} \\times R_{\\theta JC}}<\/li>\n<\/ul>\n<p>Trong \u0111\u00f3:<\/p>\n<ol>\n<li>T_{j}: Nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i (junction temperature)<\/li>\n<li>T_{a}: Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng (ambient temperature)<\/li>\n<li>P_{d}: C\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 (power dissipation)<\/li>\n<li>R_{\\theta JC}: \u0110i\u1ec7n tr\u1edf nhi\u1ec7t gi\u1eefa m\u1ed1i n\u1ed1i v\u00e0 v\u1ecf (thermal resistance junction-case)<\/li>\n<\/ol>\n<p>Qua c\u00f4ng th\u1ee9c n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 t\u00ednh to\u00e1n v\u00e0 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 m\u1ed1i n\u1ed1i \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb ho\u1ea1t \u0111\u1ed9ng trong ph\u1ea1m vi an to\u00e0n.<\/p>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn l\u00e0 m\u1ed9t quy tr\u00ecnh quan tr\u1ecdng gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t, \u0111\u1ed9 b\u1ec1n v\u00e0 an to\u00e0n c\u1ee7a thi\u1ebft b\u1ecb. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng v\u00e0 s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 v\u00e0 k\u1ef9 thu\u1eadt ph\u00f9 h\u1ee3p, ch\u00fang ta c\u00f3 th\u1ec3 qu\u1ea3n l\u00fd v\u00e0 t\u1ed1i \u01b0u h\u00f3a nhi\u1ec7t \u0111\u1ed9, \u0111\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb ho\u1ea1t \u0111\u1ed9ng t\u1ed1t trong m\u1ecdi \u0111i\u1ec1u ki\u1ec7n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ph\u00e2n t\u00edch nhi\u1ec7t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn: t\u00ecm hi\u1ec3u c\u00e1ch qu\u1ea3n l\u00fd v\u00e0 gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 trong thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed \u0111\u1ec3 n\u00e2ng cao hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n.<\/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":"<!-- This site is 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