{"id":2435,"date":"2018-07-12T02:37:07","date_gmt":"2018-07-12T02:37:07","guid":{"rendered":"https:\/\/hocvienit.vn\/?p=2435"},"modified":"2024-06-29T09:48:03","modified_gmt":"2024-06-29T02:48:03","slug":"nhung-diem-co-ban-ve-mosfet","status":"publish","type":"post","link":"https:\/\/hocvienit.vn\/?p=2435","title":{"rendered":"Nh\u1eefng \u0111i\u1ec3m c\u01a1 b\u1ea3n v\u1ec1 Mosfet"},"content":{"rendered":"
\"Nh\u1eefng
Nh\u1eefng \u0111i\u1ec3m c\u01a1 b\u1ea3n v\u1ec1 Mosfet<\/figcaption><\/figure>\n

Gi\u1edbi thi\u1ec7u v\u1ec1 Mosfet<\/strong><\/span><\/p>\n

\"\"<\/span>
\nMosfet l\u00e0 Transistor hi\u1ec7u \u1ee9ng tr\u01b0\u1eddng ( Metal Oxide Semiconductor Field Effect Transistor ) l\u00e0 m\u1ed9t Transistor \u0111\u1eb7c bi\u1ec7t c\u00f3 c\u1ea5u t\u1ea1o v\u00e0 ho\u1ea1t \u0111\u1ed9ng kh\u00e1c v\u1edbi Transistor th\u00f4ng th\u01b0\u1eddng m\u00e0 ta \u0111\u00e3 bi\u1ebft, Mosfet c\u00f3 nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng t\u1eeb tr\u01b0\u1eddng \u0111\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n, l\u00e0 linh ki\u1ec7n c\u00f3 tr\u1edf kh\u00e1ng \u0111\u1ea7u v\u00e0o l\u1edbn th\u00edch h\u1ee3n cho khuy\u1ebfch \u0111\u1ea1i c\u00e1c ngu\u1ed3n t\u00edn hi\u1ec7u y\u1ebfu, Mosfet \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u trong c\u00e1c m\u1ea1ch ngu\u1ed3n Monitor, ngu\u1ed3n m\u00e1y t\u00ednh .<\/span><\/p>\n

 <\/p>\n

C\u1ea5u t\u1ea1o v\u00e0 k\u00ed hi\u1ec7u<\/strong><\/span><\/p>\n

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

 <\/p>\n

Tr\u00ean m\u1ed9t kh\u1ed1i b\u00e1n d\u1eabn lo\u1ea1i n (ho\u1eb7c p) c\u00f3 n\u1ed3ng \u0111\u1ed9 t\u1ea1p ch\u1ea5t th\u1ea5p, ng\u01b0\u1eddi ta t\u1ea1o ra xung quanh n\u00f3 m\u1ed9t l\u1edbp b\u00e1n d\u1eabn lo\u1ea1i p (ho\u1eb7c n) c\u00f3 n\u1ed3ng \u0111\u1ed9 t\u1ea1p ch\u1ea5t cao. To\u00e0n b\u1ed9 c\u1ea5u tr\u00fac l\u1ea5y ra ba \u0111i\u1ec7n c\u1ef1c: c\u1ef1c ngu\u1ed3n S (Source), c\u1ef1c m\u00e1ng D (Drain), c\u1ef1c c\u1eeda G (Gate). Nh\u01b0 v\u1eady, gi\u1eefa c\u1ef1c S v\u00e0 c\u1ef1c D h\u00ecnh th\u00e0nh n\u00ean m\u1ed9t k\u00eanh d\u1eabn \u0111i\u1ec7n lo\u1ea1i n v\u00e0 n\u00f3 \u0111\u01b0\u1ee3c c\u00e1ch ly v\u1edbi c\u1ef1c c\u1eeda G b\u1edfi m\u1ed9t l\u1edbp ti\u1ebfp gi\u00e1p p-n. C\u1ef1c c\u1eeda G \u0111\u00f3ng vai tr\u00f2 l\u00e0 c\u1ef1c \u0111i\u1ec1u khi\u1ec3n khi thay \u0111\u1ed5i \u0111i\u1ec7n \u00e1p \u0111\u1eb7t v\u00e0o n\u00f3.<\/span><\/p>\n

Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<\/strong><\/span><\/p>\n

X\u00e9t lo\u1ea1i k\u00eanh d\u1eabn n.<\/span>
\n\u0110\u1ec3 JFET l\u00e0m vi\u1ec7c ta ph\u00e2n c\u1ef1c cho n\u00f3 b\u1edfi hai ngu\u1ed3n \u0111i\u1ec7n \u00e1p: UDS > 0, UGS < 0.<\/span>
\n– Gi\u1eefa c\u1ef1c D v\u00e0 c\u1ef1c S c\u00f3 m\u1ed9t \u0111i\u1ec7n tr\u01b0\u1eddng m\u1ea1nh do ngu\u1ed3n \u0111i\u1ec7n c\u1ef1c m\u00e1ng UDS cung c\u1ea5p, ngu\u1ed3n n\u00e0y c\u00f3 t\u00e1c d\u1ee5ng \u0111\u1ea9y c\u00e1c h\u1ea1t \u0111i\u1ec7n t\u00edch \u0111a s\u1ed1 (\u0111i\u1ec7n t\u1eed) t\u1eeb c\u1ef1c ngu\u1ed3n S t\u1edbi c\u1ef1c m\u00e1ng D, h\u00ecnh th\u00e0nh n\u00ean d\u00f2ng \u0111i\u1ec7n c\u1ef1c m\u00e1ng ID .<\/span>
\n– \u0110i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n UGS < 0 lu\u00f4n l\u00e0m cho ti\u1ebfp gi\u00e1p p-n b\u1ecb ph\u00e2n c\u1ef1c ng\u01b0\u1ee3c, do \u0111\u00f3 b\u1ec1 r\u1ed9ng v\u00f9ng ngh\u00e8o t\u0103ng d\u1ea7n khi UGS < 0 t\u0103ng d\u1ea7n. Khi \u0111\u00f3 ti\u1ebft di\u1ec7n d\u1eabn \u0111i\u1ec7n gi\u1ea3m d\u1ea7n, \u0111i\u1ec7n tr\u1edf R k\u00eanh d\u1eabn t\u0103ng l\u00ean l\u00e0m d\u00f2ng ID gi\u1ea3m xu\u1ed1ng v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/span>
\nNh\u01b0 v\u1eady: \u0111i\u1ec7n \u00e1p \u0111i\u1ec1u khi\u1ec3n UGS c\u00f3 t\u00e1c d\u1ee5ng \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed1i v\u1edbi d\u00f2ng \u0111i\u1ec7n c\u1ef1c m\u00e1ng ID.<\/span>
\n– Tr\u01b0\u1eddng h\u1ee3p: UDS > 0, UGS = 0 trong k\u00eanh d\u1eabn xu\u1ea5t hi\u1ec7n d\u00f2ng \u0111i\u1ec7n ID c\u00f3 gi\u00e1 tr\u1ecb ph\u1ee5 thu\u1ed9c v\u00e0o UDS.<\/span>
\n– UDS > 0, UGS < 0 t\u0103ng d\u1ea7n, b\u1ec1 r\u1ed9ng v\u00f9ng ngh\u00e8o m\u1edf r\u1ed9ng v\u1ec1 ph\u00eda c\u1ef1c D v\u00ec v\u1edbi c\u00e1ch m\u1eafc nh\u01b0 h\u00ecnh v\u1ebd th\u00ec \u0111i\u1ec7n th\u1ebf t\u1ea1i D l\u1edbn h\u01a1n \u0111i\u1ec7n th\u1ebf t\u1ea1i S do \u0111\u00f3 m\u1ee9c \u0111\u1ed9 ph\u00e2n c\u1ef1c ng\u01b0\u1ee3c t\u0103ng d\u1ea7n t\u1eeb S t\u1edbi D \uf0ae ti\u1ebft di\u1ec7n k\u00eanh d\u1eabn gi\u1ea3m d\u1ea7n l\u00e0m cho d\u00f2ng ID gi\u1ea3m d\u1ea7n.<\/span><\/p>\n

4. \u0110o ki\u1ec3m tra Mosfet\u00a0<\/strong><\/span><\/p>\n

M\u1ed9t Mosfet c\u00f2n t\u1ed1t\u00a0: L\u00e0 khi \u0111o tr\u1edf kh\u00e1ng gi\u1eefa G v\u1edbi S v\u00e0 gi\u1eefa G v\u1edbi D c\u00f3 \u0111i\u1ec7n tr\u1edf b\u1eb1ng v\u00f4 c\u00f9ng ( kim kh\u00f4ng l\u00ean c\u1ea3 hai chi\u1ec1u \u0111o)\u00a0 v\u00e0 khi G \u0111\u00e3 \u0111\u01b0\u1ee3c tho\u00e1t \u0111i\u1ec7n th\u00ec tr\u1edf kh\u00e1ng gi\u1eefa D v\u00e0 S ph\u1ea3i l\u00e0 v\u00f4 c\u00f9ng.<\/span><\/p>\n

C\u00e1c b\u01b0\u1edbc ki\u1ec3m tra nh\u01b0 sau :<\/span><\/p>\n

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

B\u01b0\u1edbc 1 : Chu\u1ea9n b\u1ecb \u0111\u1ec3 thang x1KW<\/span><\/p>\n

B\u01b0\u1edbc 2 : N\u1ea1p cho G m\u1ed9t \u0111i\u1ec7n t\u00edch ( \u0111\u1ec3 que \u0111en v\u00e0o G que \u0111\u1ecf v\u00e0o S ho\u1eb7c D )<\/span><\/p>\n

B\u01b0\u1edbc 3 : Sau khi n\u1ea1p cho G m\u1ed9t \u0111i\u1ec7n t\u00edch ta \u0111o gi\u1eefa D v\u00e0 S ( que \u0111en v\u00e0o D que \u0111\u1ecf v\u00e0o S ) => kim s\u1ebd l\u00ean.<\/span><\/p>\n

B\u01b0\u1edbc 4 : Ch\u1eadp G v\u00e0o D ho\u1eb7c G v\u00e0o S \u0111\u1ec3 tho\u00e1t \u0111i\u1ec7n ch\u00e2n G.<\/span><\/p>\n

B\u01b0\u1edbc 5 : Sau khi \u0111\u00e3 tho\u00e1t \u0111i\u1ec7n ch\u00e2n G \u0111o l\u1ea1i DS nh\u01b0 b\u01b0\u1edbc 3 kim kh\u00f4ng l\u00ean.<\/span><\/p>\n

=> K\u1ebft qu\u1ea3 nh\u01b0 v\u1eady l\u00e0 Mosfet t\u1ed1t.<\/span><\/p>\n

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

B\u01b0\u1edbc 1 : \u0110\u1ec3 \u0111\u1ed3ng h\u1ed3 thang x 1KW<\/span><\/p>\n

\u0110o gi\u1eefa G v\u00e0 S ho\u1eb7c gi\u1eefa G v\u00e0 D n\u1ebfu kim l\u00ean = 0 W l\u00e0 ch\u1eadp<\/span><\/p>\n

\u0110o gi\u1eefa D v\u00e0 S m\u00e0 c\u1ea3 hai chi\u1ec1u \u0111o kim l\u00ean = 0 W l\u00e0 ch\u1eadp D S<\/span><\/p>\n

5. \u1ee8ng dung c\u1ee7a Mosfet trong th\u1ef1c t\u1ebf<\/strong><\/span><\/p>\n

Mosfet trong ngu\u1ed3n xung c\u1ee7a Monitor<\/span><\/p>\n

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

 <\/p>\n

Trong b\u1ed9 ngu\u1ed3n xung c\u1ee7a Monitor ho\u1eb7c m\u00e1y vi t\u00ednh, ng\u01b0\u1eddi ta th\u01b0\u1eddng d\u00f9ng c\u1eb7p linh ki\u1ec7n l\u00e0 IC t\u1ea1o dao \u0111\u1ed9ng v\u00e0 \u0111\u00e8n Mosfet, dao \u0111\u1ed9ng t\u1ea1o ra t\u1eeb IC c\u00f3 d\u1ea1ng xung vu\u00f4ng \u0111\u01b0\u1ee3c \u0111\u01b0a \u0111\u1ebfn ch\u00e2n G c\u1ee7a Mosfet, t\u1ea1i th\u1eddi \u0111i\u1ec3m xung c\u00f3 \u0111i\u1ec7n \u00e1p > 0V => \u0111\u00e8n Mosfet d\u1eabn, khi xung dao \u0111\u1ed9ng = 0V Mosfet ng\u1eaft => nh\u01b0 v\u1eady dao \u0111\u1ed9ng t\u1ea1o ra s\u1ebd \u0111i\u1ec1u khi\u1ec3n cho Mosfet li\u00ean t\u1ee5c \u0111\u00f3ng ng\u1eaft t\u1ea1o th\u00e0nh d\u00f2ng \u0111i\u1ec7n bi\u1ebfn thi\u00ean li\u00ean t\u1ee5c ch\u1ea1y qua cu\u1ed9n s\u01a1 c\u1ea5p => sinh ra t\u1eeb tr\u01b0\u1eddng bi\u1ebfn thi\u00ean c\u1ea3m \u1ee9ng l\u00ean c\u00e1c cu\u1ed9n th\u1ee9 c\u1ea5p => cho ta \u0111i\u1ec7n \u00e1p ra.<\/span><\/p>\n

* \u0110o ki\u1ec3m tra Mosfet trong m\u1ea1ch .<\/strong><\/span>
\nKhi ki\u1ec3m tra Mosfet trong m\u1ea1ch , ta ch\u1ec9 c\u1ea7n \u0111\u1ec3 thang x1W v\u00e0 \u0111o gi\u1eefa D v\u00e0 S => N\u1ebfu 1 chi\u1ec1u kim l\u00ean \u0111\u1ea3o chi\u1ec1u \u0111o kim kh\u00f4ng l\u00ean => l\u00e0 Mosfet b\u00ecnh th\u01b0\u1eddng, N\u1ebfu c\u1ea3 hai chi\u1ec1u kim l\u00ean = 0 W l\u00e0 Mosfet b\u1ecb ch\u1eadp DS.<\/span><\/p>\n

 <\/p>\n

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

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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

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Gi\u1edbi thi\u1ec7u v\u1ec1 Mosfet Mosfet l\u00e0 Transistor hi\u1ec7u \u1ee9ng tr\u01b0\u1eddng ( Metal Oxide Semiconductor Field Effect Transistor ) l\u00e0 m\u1ed9t Transistor \u0111\u1eb7c bi\u1ec7t c\u00f3 c\u1ea5u t\u1ea1o v\u00e0 ho\u1ea1t \u0111\u1ed9ng kh\u00e1c v\u1edbi Transistor th\u00f4ng th\u01b0\u1eddng m\u00e0 ta \u0111\u00e3 bi\u1ebft, Mosfet c\u00f3 nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean hi\u1ec7u \u1ee9ng t\u1eeb tr\u01b0\u1eddng \u0111\u1ec3 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n, […]\n","protected":false},"author":95,"featured_media":12378,"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\/2435"}],"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=2435"}],"version-history":[{"count":0,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/2435\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/media\/12378"}],"wp:attachment":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2435"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2435"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2435"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}