{"id":1433,"date":"2018-07-06T03:54:35","date_gmt":"2018-07-06T03:54:35","guid":{"rendered":"https:\/\/hocvienit.vn\/?p=1433"},"modified":"2025-01-06T15:04:01","modified_gmt":"2025-01-06T08:04:01","slug":"nguyen-ly-nguon-xung-trong-laptop","status":"publish","type":"post","link":"https:\/\/hocvienit.vn\/?p=1433","title":{"rendered":"Nguy\u00ean l\u00fd ngu\u1ed3n xung trong laptop"},"content":{"rendered":"
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\u0110\u1ec3 ti\u1ec7n theo d\u00f5i , \u0111\u1ea7u ti\u00ean ch\u00fang ta t\u00ecm hi\u1ec3u s\u01a1 v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng chung c\u1ee7a 1 kh\u1ed1i ngu\u1ed3n sw hay c\u00f2n g\u1ecdi l\u00e0 ngu\u1ed3n xung trong laptop.<\/p>\n

\"Nguy\u00ean
Nguy\u00ean l\u00fd ngu\u1ed3n xung trong laptop<\/figcaption><\/figure>\n

C\u0169ng nh\u01b0 c\u00e1c b\u1ed9 trong \u0111a s\u1ed1 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed , ngu\u1eddi ta s\u1eed dung ngu\u1ed3n xung d\u1ea1ng chuy\u1ec3n \u0111\u1ed5i DC-DC ( DC converter ) v\u1edbi vi\u1ec7c \u0111i\u1ec1u ch\u1ebf ra xung vu\u00f4ng t\u1ea7n s\u1ed1 kho\u1ea3ng 300khz \u0111\u1ec3 \u0111\u1ec5 d\u00e0ng chuy\u1ec3n \u0111\u1ed5i ra c\u00e1c \u0111i\u1ec7n th\u1ebf DC v\u00ec vi\u1ec7c n\u1eafn l\u1ecdc, b\u00f9 ngu\u1ed3n d\u1ec5 d\u00e0ng h\u01a1n d\u1ea1ng s\u00f3ng h\u00ecnh sin , t\u1ea7n s\u1ed1 th\u1ea5p.<\/p>\n

– vi\u1ec7c \u0111i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung (PWM \u2013 Pulse Width Modulation) s\u1ebd cho t\u00edn hi\u1ec7u (xung vu\u00f4ng) ng\u1ef1oc pha nhau \u0111\u1eb7t v\u00e0o c\u1ef1c G c\u1ee7a t\u1eebng c\u1eb7p mosfet ho\u1ea1t \u0111\u1ed9ng dang k\u00e9o \u0111\u1ea9y t\u00f9y theo th\u1eddi gian d\u1eabn c\u1ee7a fet nhi\u1ec1u hay \u00edt \u0111\u1ec3 c\u00f3 \u0111i\u1ec7n th\u1ebf ra nh\u01b0 mong mu\u1ed1n , t\u1ea1i trung \u0111i\u1ec3m cho ra di\u1ec7n th\u1ebf nh\u01b0 thi\u1ebft k\u1ebf , \u0111\u01b0\u1ee3c d\u1eabn l\u1ecdc qua cu\u1ed9n c\u1ea3m v\u00e0 t\u1ee5 , cho ra d\u00f2ng DC tu\u01a1ng \u0111\u1ed1i b\u1eb1ng ph\u1eb3ng.
\n-s\u01a1 \u0111\u1ed3 kh\u1ed1i m\u1ed9t m\u1ed9t kh\u1ed1i ngu\u1ed3n laptop nh\u01b0 sau<\/p>\n

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Th\u00f4ng thu\u1eddng m\u1ed7i kh\u1ed1i ngu\u1ed3n g\u1ed3m 3 th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n :
\n-Kh\u1ed1i giao \u0111\u1ed9ng t\u1ea1o xung
\n-Kh\u1ed1i c\u00f4ng su\u1ea5t
\n-Kh\u1ed1i h\u1ed3i ti\u1ebfp so s\u00e1nh \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9 r\u1ed9ng xung ra nh\u1eb1m \u1ed5n \u0111\u1ecbnh \u0111i\u1ec7n th\u1ebf.
\nRi\u00eang ph\u1ea7n ngu\u1ed3n s\u1ea1c v\u00e0 1 s\u1ed1 ph\u1ea7n ngu\u1ed3n kh\u00e1c c\u00f3 th\u00eam kh\u1ed1i h\u1ed3i ti\u1ebfp nh\u1eadn d\u1ea1ng d\u00f2ng \u0111\u1ec3 ph\u1ee5c v\u1ee5 cho b\u1ea3o v\u1ec7 ch\u1ea1m t\u1ea3i ho\u1eb7c c\u1eaft d\u00f2ng s\u1ea1c khi pin \u0111\u1ea7y.<\/p>\n

* C\u01a1 ch\u1ebf \u1ed5n \u00e1p c\u00f3 th\u1ec3 hi\u1ec3u nh\u01b0 sau.<\/p>\n

\"\"<\/p>\n

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nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n v\u1eabn l\u00e0 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 r\u1ed9ng xung ngh\u0129a l\u00e0 l\u00e0m cho th\u1eddi gian xu\u1ea5t hi\u1ec7n xung (Ton) + l\u00e2u hay nhanh t\u1eeb \u0111\u00f3 \u0111i\u1ec1u khi\u1ec3n fet k\u00eanh N d\u1eabn \/ t\u1eaft v\u1edbi th\u1eddi gian tu\u01a1ng \u1ee9ng .<\/p>\n

– Nh\u01b0 minh h\u1ecda tr\u00ean cho ta th\u1ea5y gi\u1ea3 s\u1eed ngu\u1ed3n c\u1ea7n l\u1ea5y ra tr\u00ean \u0111\u1ea7u t\u1ee5 l\u00e0 3vdc , l\u00fac \u0111\u00f3 3v n\u00e0y nh\u1edd c\u1ea7u ph\u00e2n \u00e1p r1, r2 l\u1ea5y ra 3v v\u1ec1 kh\u1ed1i so s\u00e1nh ,h\u1ea7u h\u1ebft c\u00e1c \u0111u\u1eddng h\u1ed3i v\u1ec1 n\u00e0y trong ngu\u1ed3n laptop \u0111\u1ec1u d\u00f9ng 2 tr\u1edf v\u00e0 t\u1ed5ng tr\u1edf ng\u00f5 v\u00e0o t\u1ea7ng so s\u00e1nh l\u00e0 r\u1ea5t l\u1edbn n\u00ean c\u00f3 th\u1ec3 coi d\u00f2ng ti\u00eau th\u1ee5 ng\u00f5 v\u00e0o = 0 n\u00ean U h\u1ed3i v\u1ec1 n\u00e0y (VFB) c\u00f3 th\u1ec3 \u0111u\u1ee3c t\u00ednh = c\u00f4ng th\u1ee9c :<\/p>\n[SIZE [\/SIZE]\n

*Tru\u1eddng h\u1ee3p B Gi\u1ea3 s\u1eed \u1edf \u0111\u00e2y ta l\u1ea5y ra VFB = 3v , 3v n\u00e0y v\u1ec1 c\u1eaft xung tam gi\u00e1c trong kh\u1ed1i giao \u0111\u1ed9ng \u1edf c\u00e1c \u0111i\u1ec3m 1′ , 2′ , 3′. \u1ee9ng v\u1edbi chi\u1ec1u l\u00ean c\u1ee7a xung ta c\u00f3 \u0111u\u1ee3c xung vu\u00f4ng Ton1 c\u00f3 th\u1eddi gian t\u1eeb 1′ \u0111\u1ebfn 2′. \u1ee8ng v\u1edbi chi\u1ec1u xu\u1ed1ng c\u1ee7a xung ta c\u00f3 \u0111u\u1ee3c xung vu\u00f4ng Toff1 k\u00e9o d\u00e0i t\u1eeb 2′ \u0111\u1ebfn 3′ , v\u1edbi xung vu\u00f4ng (B) n\u00e0y s\u1ebd \u0111i\u1ec1u khi\u1ec3n fet d\u1eabn \/ t\u1eaft v\u00e0 cho ra \u0111i\u1ec7n th\u1ebf l\u00e0 3v theo thi\u1ebft k\u1ebf.<\/p>\n

*Tr\u01b0\u1eddng h\u1ee3p C Khi \u0111\u1ea7u ra c\u00f3 s\u1ef1 thay \u0111\u1ed5i th\u1ea7p h\u01a1n 3V , qua c\u1ea7u ph\u00e2n \u00e1p , U h\u1ed3i v\u1ec1 th\u1ea5p theo vd 2,8v nh\u01b0 h\u00ecnh tr\u00ean ( C ) . 2,8v n\u00e0y c\u1eaft xung tam gi\u00e1c t\u1ea1i c\u00e1c \u0111i\u1ec3m 1″ , 2″ , 3″. \u1ee8ng v\u1edbi chi\u1ec1u l\u00ean c\u1ee7a xung ta c\u00f3 xung vu\u00f4ng Ton3 k\u00e9o d\u00e0i t\u1eeb 1″ \u0111\u1ebfn 2″ m\u1edf r\u1ed9ng h\u01a1n tru\u1edbc v\u00e0 \u1ee9ng v\u1edbi chi\u1ec1u xu\u1ed1ng c\u1ea3u xung ta c\u00f3 xung vu\u00f4ng Toff3 thu h\u1eb9p l\u1ea1i k\u00e9o d\u00e0i t\u1eeb 2″ –3″.<\/p>\n

* Tru\u1eddng h\u1ee3p A , khi \u0111i\u1ec7n th\u1ebf ra cao h\u01a1n 3v , qua c\u1ea7u ph\u00e2n th\u1ebf , h\u1ed3i v\u1ec1 v\u1edbi di\u00ean ap VFB l\u00e0 3.2v , \u0111i\u1ec7n \u00e1p n\u00e0y d\u00e2ng l\u00ean v\u00e0 c\u1eaft xung nh\u1ecdn \u1edf c\u00e1c \u0111i\u1ec3m 1 ,2 , 3. \u1ee9ng v\u1edbi t\u1eeb 1–2 ta c\u00f3 xung vu\u00f4ng Ton2 thu h\u1eb9p l\u1ea1i , \u1ee9ng v\u1edbi \u0111i\u1ec3m c\u1eaft 2 \u0111\u1ebfn 3 ta c\u00f3 xung vu\u00f4ng Toff2 m\u1edf r\u1ed9ng ra.
\nch\u00ednh nh\u1eefng th\u1eddi gian Ton m\u1edf r\u1ed9ng hay thu h\u1eb9p s\u1ebd \u0111\u1ebfn \u0111i\u1ec1u khi\u1ec3n fet l\u00e0m t\u0103ng gi\u1ea3m th\u1eddi gian d\u1eabn , t\u1eaft c\u1ee7a fet s\u1ebd \u0111i\u1ec1u ch\u1ec9nh lu\u00f4n cho ra U= 3v theo thi\u1ebft k\u1ebf.<\/p>\n

-nh\u01b0 v\u1eady d\u00f9 TON , TOFF thay \u0111\u1ed5i nh\u01b0ng chu k\u1ef3 T kh\u00f4ng \u0111\u1ed5i ch\u1ec9 c\u00f3 s\u1ef1 d\u1ecbch pha.<\/p>\n<\/div>\n

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M\u1ecdi chi ti\u1ebft xin vui l\u00f2ng li\u00ean h\u1ec7:<\/i><\/p>\n

C\u00d4NG TY C\u1ed4 PH\u1ea6N H\u1eccC VI\u1ec6N IT<\/strong>
\nMST: 0108733789<\/strong>
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\u0110\u0103ng k\u00fd k\u00eanh Youtube \u0111\u1ec3 theo d\u00f5i c\u00e1c b\u00e0i h\u1ecdc c\u1ee7a Hu\u1ea5n luy\u1ec7n vi\u00ean t\u1ed1t nh\u1ea5t:<\/strong>\u00a0http:\/\/bit.ly\/Youtube_HOCVIENiT<\/a><\/p>\n

Tham gia c\u1ed9ng \u0111\u1ed3ng H\u1ecdc vi\u1ec7n IT.vn t\u1ea1i:<\/strong>\u00a0https:\/\/www.facebook.com\/groups\/www.hocvienit.vn\/<\/a><\/p>\n

Tr\u1ee5 s\u1edf H\u00e0 N\u1ed9i:<\/strong>\u00a0S\u1ed1 8 ng\u00f5 117 Th\u00e1i H\u00e0, \u0110\u1ed1ng \u0110a, H\u00e0 N\u1ed9i<\/p>\n

H\u1ed3 Ch\u00ed Minh:<\/strong>\u00a0S\u1ed1 283\/45 C\u00e1ch M\u1ea1ng Th\u00e1ng T\u00e1m, Ph\u01b0\u1eddng 12, Qu\u1eadn 10,\u00a0TP.HCM
\nH\u1ea3i Ph\u00f2ng:<\/strong>\u00a0S\u1ed1 94 Qu\u00e1n Nam, L\u00ea Ch\u00e2n, H\u1ea3i Ph\u00f2ng<\/p>\n

Th\u00e1i Nguy\u00ean:<\/strong>\u00a0S\u1ed1 297 L\u01b0\u01a1ng Ng\u1ecdc Quy\u1ebfn, TP. Th\u00e1i Nguy\u00ean
\nH\u1ecdc vi\u1ec7n IT.vn \u2013 Truy\u1ec1n ngh\u1ec1 th\u1ef1c t\u1ebf c\u00f9ng b\u1ea1n \u0111\u1ebfn th\u00e0nh c\u00f4ng!\u00a0<\/i><\/strong><\/p>\n

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\u0110\u1ec3 ti\u1ec7n theo d\u00f5i , \u0111\u1ea7u ti\u00ean ch\u00fang ta t\u00ecm hi\u1ec3u s\u01a1 v\u1ec1 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng chung c\u1ee7a 1 kh\u1ed1i ngu\u1ed3n sw hay c\u00f2n g\u1ecdi l\u00e0 ngu\u1ed3n xung trong laptop.<\/p>\n","protected":false},"author":95,"featured_media":12099,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[662],"_links":{"self":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/1433"}],"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=1433"}],"version-history":[{"count":0,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/1433\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/media\/12099"}],"wp:attachment":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1433"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1433"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}