{"id":2440,"date":"2018-07-12T02:39:53","date_gmt":"2018-07-12T02:39:53","guid":{"rendered":"https:\/\/hocvienit.vn\/?p=2440"},"modified":"2024-06-29T09:48:03","modified_gmt":"2024-06-29T02:48:03","slug":"mosfet-dao-nhiem-vu-va-hoat-dong","status":"publish","type":"post","link":"https:\/\/hocvienit.vn\/?p=2440","title":{"rendered":"Mosfet \u0111\u1ea3o nhi\u1ec7m v\u1ee5 v\u00e0 ho\u1ea1t \u0111\u1ed9ng"},"content":{"rendered":"
\"Mosfet
Mosfet \u0111\u1ea3o nhi\u1ec7m v\u1ee5 v\u00e0 ho\u1ea1t \u0111\u1ed9ng<\/figcaption><\/figure>\n

1. Nguy\u00ean l\u00fd h\u1ecdat \u0111\u1ed9ng ngu\u1ed3n ATX:<\/strong><\/span><\/h2>\n

– Gi\u1eafc ngu\u1ed3n 20pin ho\u1eb7c 24pin c\u00f3 1 d\u00e2y m\u00e0u xanh l\u00e1 c\u00e2y g\u1ecdi l\u00e0 d\u00e2y c\u00f4ng t\u1eafc d\u00e2y n\u00e0y khi m\u1edbi<\/span>
\nc\u1eafm \u0111i\u1ec7n s\u1ebd c\u00f3 2v5 \u0111\u1ebfn 5v n\u1ebfu “ch\u1eadp” d\u00e2y n\u00e0y xu\u1ed1ng mass th\u1ee9c \u00e9p cho n\u00f3 = 0V th\u00ec b\u1ed9 ngu\u1ed3n s\u1ebd<\/span>
\nch\u1ea1y.<\/span><\/p>\n

\"\"<\/span><\/p>\n

– \u0110\u00f3 l\u00e0 c\u00e1ch th\u1eed b\u1ed9 ngu\u1ed3n r\u1eddi xem ngu\u1ed3n c\u00f3 “ch\u1ea1y” hay kh\u00f4ng. C\u0169ng l\u00e0 c\u00e1ch ta k\u00edch \u00e9p ngu\u1ed3n<\/span>
\nph\u1ea3i ch\u1ea1y khi c\u1ea7n thi\u1ebft.<\/span>
\n– Khi ta c\u1eafm gi\u1eafc ngu\u1ed3n v\u00e0o main, tr\u00ean main s\u1ebd c\u00f3 1 c\u00e1i “c\u00f4ng t\u1eafc” \u0111i\u1ec7n t\u1eed s\u1ebd \u0111\u00f3ng, ng\u1eaft theo s\u1ef1<\/span>
\n\u0111i\u1ec1u khi\u1ec3n c\u1ee7a “chip NAM” th\u00f4ng qua “chip SIO”. C\u00f4ng t\u1eafc n\u00e0y \u0111\u00f3ng c\u00f3 ngh\u0129a d\u00e2y xanh l\u00e1 l\u00fac<\/span>
\nn\u00e0y s\u1ebd \u0111\u01b0\u1ee3c “ch\u1eadp” xu\u1ed1ng mass v\u00e0 b\u1ed9 ngu\u1ed3n ATX s\u1ebd \u0111\u01b0\u1ee3c k\u00edch ch\u1ea1y.<\/span>
\n– T\u01b0\u01a1ng t\u1ef1 khi ta shutdown m\u00e1y, h\u1ec7 \u0111i\u1ec1u h\u00e0nh s\u1ebd ra l\u1ec7nh “ng\u1eaft” c\u00f4ng t\u1eafc “\u0111i\u1ec7n t\u1eed” n\u00e0y s\u1ebd th\u00f4ng<\/span>
\nqua “chip NAM” v\u00e0 “chip SIO” \u0111\u1ebfn v\u1edbi “c\u00f4ng t\u1eafc” v\u00e0 b\u1ed9 ngu\u1ed3n ATX s\u1ebd \u0111\u01b0\u1ee3c “t\u1eaft”.<\/span>
\n2. Ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Mosfet \u0111\u1ea3o:<\/strong><\/span>
\n– V\u00e0 c\u00e1i “c\u00f4ng t\u1eafc \u0111i\u1ec7n t\u1eed” \u0111\u00f3 ch\u00ednh l\u00e0 “mosfet \u0111\u1ea3o”. Th\u1ef1c ra \u0111\u1ec3 l\u00e0m nhi\u1ec7m v\u1ee5 c\u00f4ng t\u1eafc \u0111i\u1ec7n t\u1eed<\/span>
\nn\u00e0y c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t transistor th\u00f4ng th\u01b0\u1eddng. Nh\u01b0ng do c\u00e1c mainboard th\u01b0\u1eddng thi\u1ebft k\u1ebf 1 mosfet l\u00e0m<\/span>
\nnhi\u1ec7m v\u1ee5 n\u00e0y n\u00ean ta g\u1ecdi l\u00e0 mosfet \u0111\u1ea3o.<\/span><\/p>\n

\"\"<\/span><\/p>\n

– V\u1eady t\u1ea1i sao l\u1ea1i g\u1ecdi l\u00e0 mosfet \u0111\u1ea3o?<\/span>
\n– Khi mu\u1ed1n \u0111\u00f3ng c\u00f4ng t\u1eafc \u0111\u1ec3 ch\u1eadp ch\u00e2n xanh l\u00e1 xu\u1ed1ng mass th\u00ec t\u1eeb chip SIO s\u1ebd c\u00f3 m\u1ed9t xung<\/span>
\nd\u01b0\u01a1ng (2v5 \u0111\u1ebfn 5v) k\u00edch ch\u00e2n G c\u1ee7a mosfet, l\u00e0m cho mosfet d\u1eabn t\u1eeb D-S. T\u01b0\u01a1ng \u1ee9ng v\u1edbi vi\u1ec7c<\/span>
\nch\u00e2n xanh l\u00e0 ch\u1eadp mass. Xung d\u01b0\u01a1ng (c\u00f3 \u00e1p) ra l\u00e0m cho ch\u00e2n D-S xu\u1ed1ng mass (m\u1ea5t \u00e1p). T\u1eeb c\u00f3<\/span>
\n\u00e1p -> m\u1ea5t \u00e1p l\u00e0 h\u1ecdat \u0111\u1ed9ng c\u1ee7a m\u1ed9t c\u1ed5ng \u0111\u1ea3o. C\u00f3 \u00e1p qua c\u1ed5ng \u0111\u1ea3o th\u00e0nh kh\u00f4ng \u00e1p. N\u00ean ta g\u1ecdi<\/span>
\nmosfet n\u00e0y gi\u1eef nhi\u1ec7m v\u1ee5 nh\u01b0 m\u1ed9t c\u1ed5ng \u0111\u1ea3o. V\u00e0 g\u1ecdi t\u1eaft l\u00e0 mosfet \u0111\u1ea3o l\u00e0 nh\u01b0 v\u1eady.\u00a0<\/span>
\n– V\u1eady n\u1ebfu main kh\u00f4ng c\u00f3 mosfet \u0111\u1ea3o th\u00ec sao ???<\/span>
\n– Th\u1ef1c ra mosfet \u0111\u1ea3o \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u00e0o b\u00ean trong chip SIO. \u0110\u00e2y l\u00e0 thi\u1ebft k\u1ebf ban \u0111\u1ea7u c\u1ee7a chip<\/span>
\nSIO. V\u1ec1 sau m\u1ed9t s\u1ed1 h\u00e3ng s\u1ea3n xu\u1ea5t m\u1edbi thi\u1ebft k\u1ebf l\u1ea1i v\u00e0 \u0111\u01b0a mosfet \u0111\u1ea3o n\u00e0y ra ng\u00f2ai. Do n\u1eb1m b\u00ean<\/span>
\ntrong m\u00e0 h\u01b0 l\u00e0 ph\u1ea3i thay nguy\u00ean chip SIO.\u00a0<\/span>
\n3. C\u00e1c h\u01b0 h\u1ecfng do mosfet \u0111\u1ea3o g\u00e2y n\u00ean:<\/strong><\/span>
\n– Kh\u00f4ng k\u00edch ngu\u1ed3n: do b\u1ecb \u0111\u1ee9t mosfet, nh\u01b0 th\u1ec3 c\u00f4ng t\u1eafc \u0111\u00e8n b\u1ecb h\u01b0 th\u00ec cho d\u00f9 ta c\u00f3 b\u1eadt c\u00e1ch g\u00ec th\u00ec<\/span>
\n\u0111\u00e8n c\u0169ng kh\u00f4ng s\u00e1ng cho \u0111\u1ebfn khi thay c\u00f4ng t\u1eafc m\u1edbi.<\/span>
\n– C\u1eafm \u0111i\u1ec7n l\u00e0 ngu\u1ed3n t\u1ef1 ch\u1ea1y, shutdown ngu\u1ed3n kh\u00f4ng t\u1eafc m\u00e0 l\u1ea1i ti\u1ebfp t\u1ee5c ch\u1ea1y (nh\u01b0 ch\u1ecdn restart<\/span>
\nhay reset): do ch\u1eadp D-S c\u1ee7a mosfet. Nh\u01b0 th\u1ec3 c\u00f4ng t\u1eafc \u0111\u00e8n b\u1ecb ch\u1eadp th\u00ec cho d\u00f9 ta c\u00f3 b\u1eadt hay t\u1eaft g\u00ec<\/span>
\nth\u00ec \u0111\u00e8n v\u1eabn c\u1ee9 m\u1edf.<\/span>
\n4. C\u00e1ch x\u00e1c \u0111\u1ecbnh mosfet \u0111\u1ea3o:<\/strong><\/span>
\n– Tr\u01b0\u1edbc ti\u00ean ph\u1ea3i x\u00e1c \u0111\u1ecbnh xem mainboard c\u00f3 mosfet hay kh\u00f4ng. D\u00f9ng ph\u00e9p \u0111o th\u00f4ng m\u1ea1ch (\u0111o<\/span>
\n\u00f4m x1) gi\u1eefa ch\u00e2n 14 (ch\u00e2n gi\u1eafc c\u1eafm m\u00e0u xanh l\u00e1) v\u00e0 c\u00e1c ch\u00e2n c\u1ee7a chip SIO (r\u00e0 que \u0111o l\u00ean c\u00e1c<\/span>
\nch\u00e2n c\u1ee7a SIO). N\u1ebfu c\u00f3 ch\u00e2n th\u00f4ng m\u1ea1ch =0 \u00f4m th\u00ec kh\u00f4ng c\u00f3 mosfet \u0111\u1ea3o n\u1eb1m b\u00ean ng\u00f2ai. Ng\u01b0\u1ee3c<\/span>
\nl\u1ea1i, kh\u00f4ng c\u00f3 ch\u00e2n n\u00e0o th\u00f4ng m\u1ea1ch = 0 \u00f4m th\u00ec l\u00e0 c\u00f3 mosfet \u0111\u1ea3o n\u1eb1m ng\u00f2ai.<\/span>
\n– C\u00e1ch t\u00ecm mosfet \u0111\u1ea3o, l\u00e0 ph\u1ea3i \u0111o l\u1ea7n l\u01b0\u1ee3t c\u00e1c mosfet nh\u00ed xung quanh khu v\u1ef1c gi\u1eefa g\u1eafc c\u1eafm 14<\/span>
\n\u0111\u1ebfn chip SIO. Ch\u1ee7 y\u1ebfu l\u00e0 kinh nghi\u1ec7m, n\u1ebfu kh\u00f4ng th\u00ec ph\u1ea3i d\u00f2 t\u1ea5t c\u1ea3 mosfet tr\u00ean mainboard.<\/span><\/p>\n

 <\/p>\n

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1. Nguy\u00ean l\u00fd h\u1ecdat \u0111\u1ed9ng ngu\u1ed3n ATX: – Gi\u1eafc ngu\u1ed3n 20pin ho\u1eb7c 24pin c\u00f3 1 d\u00e2y m\u00e0u xanh l\u00e1 c\u00e2y g\u1ecdi l\u00e0 d\u00e2y c\u00f4ng t\u1eafc d\u00e2y n\u00e0y khi m\u1edbi c\u1eafm \u0111i\u1ec7n s\u1ebd c\u00f3 2v5 \u0111\u1ebfn 5v n\u1ebfu “ch\u1eadp” d\u00e2y n\u00e0y xu\u1ed1ng mass th\u1ee9c \u00e9p cho n\u00f3 = 0V th\u00ec b\u1ed9 ngu\u1ed3n s\u1ebd ch\u1ea1y. – \u0110\u00f3 […]\n","protected":false},"author":95,"featured_media":12375,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96,94],"tags":[498],"_links":{"self":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/2440"}],"collection":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/users\/95"}],"replies":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2440"}],"version-history":[{"count":0,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/2440\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/media\/12375"}],"wp:attachment":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2440"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2440"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}