{"id":3025,"date":"2018-07-23T07:45:00","date_gmt":"2018-07-23T07:45:00","guid":{"rendered":"https:\/\/hocvienit.vn\/?p=3025"},"modified":"2025-04-03T15:53:21","modified_gmt":"2025-04-03T08:53:21","slug":"co-che-hoat-dong-cua-nguon-xung","status":"publish","type":"post","link":"https:\/\/hocvienit.vn\/?p=3025","title":{"rendered":"C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n xung"},"content":{"rendered":"<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\"><strong>Ngu\u1ed3n xung<\/strong>, n\u00f3i c\u00e1ch kh\u00e1c\u00a0b\u1ed9 chuy\u1ec3n \u0111\u1ed5i\u00a0DC-DC (DC converter), \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng h\u1ea7u h\u1ebft tr\u00ean c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed, v\u1edbi vi\u1ec7c \u0111i\u1ec1u ch\u1ebf ra xung vu\u00f4ng c\u00f3 t\u1ea7n s\u1ed1 v\u00e0o kho\u1ea3ng 300khz.\u00a0Ngu\u1ed3n xung c\u00f3 \u01b0u \u0111i\u1ec3m hi\u1ec7u su\u1ea5t \u0111\u1ea7u ra cao, d\u1ec5 chuy\u1ec3n \u0111\u1ed5i, n\u1eafn l\u1ecdc b\u00f9 ngu\u1ed3n d\u1ec5 d\u00e0ng h\u01a1n so v\u1edbi d\u1ea1ng s\u00f3ng h\u00ecnh sin t\u1ea7n s\u1ed1 th\u1ea5p.<\/span><\/div>\n<div style=\"text-align: justify;\">\n<figure id=\"attachment_12402\" aria-describedby=\"caption-attachment-12402\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-12402 size-full\" title=\"C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n xung laptop\" src=\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-laptop.jpg\" alt=\"C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n xung laptop\" width=\"750\" height=\"400\" srcset=\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-laptop.jpg 750w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-laptop-510x272.jpg 510w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-laptop-300x160.jpg 300w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-laptop-600x320.jpg 600w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-12402\" class=\"wp-caption-text\"><\/span> <span style=\"font-size: 17px;\">C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n xung laptop<\/span><\/figcaption><\/figure>\n<\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Vi\u1ec7c \u0111i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung( PWM \u2013Pusle width Modulation), cho ra xung vu\u00f4ng ng\u01b0\u1ee3c pha nhau \u0111\u1eb7t v\u00e0o c\u1ef1c G t\u1eebng c\u1eb7p mosfet, ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi d\u1ea1ng k\u00e9o \u0111\u1ea9y t\u00f9y thu\u1ed9c v\u00e0o th\u1eddi gian \u0111\u00f3ng\/ ng\u1eaft theo nh\u01b0 thi\u1ebft k\u1ebf \u0111\u1ec3 c\u00f3 \u0111i\u1ec7n \u00e1p \u0111\u1ea7u ra mong mu\u1ed1n. T\u1ea1i trung \u0111i\u1ec3m \u0111i\u1ec7n th\u1ebf \u0111i ra \u0111\u01b0\u1ee3c \u0111i qua cu\u1ed9n c\u1ea3m v\u00e0 t\u1ee5 l\u1ecdc (m\u1eaft l\u1ecdc LC) cho ra \u0111i\u1ec7n \u00e1p DC t\u01b0\u01a1ng \u0111\u1ed1i b\u1eb1ng ph\u1eb3ng.<\/span><\/div>\n<div><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">S\u01a1 \u0111\u1ed3 kh\u1ed1i ngu\u1ed3n xung c\u00f3 d\u1ea1ng nh\u01b0 sau:<\/span><\/div>\n<div>\n<figure id=\"attachment_45760\" aria-describedby=\"caption-attachment-45760\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-45760 size-full\" title=\"S\u01a1 \u0111\u1ed3 kh\u1ed1i ngu\u1ed3n xung\" src=\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-1.jpg\" alt=\"S\u01a1 \u0111\u1ed3 kh\u1ed1i ngu\u1ed3n xung\" width=\"750\" height=\"400\" srcset=\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-1.jpg 750w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-1-300x160.jpg 300w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-1-510x272.jpg 510w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-45760\" class=\"wp-caption-text\">S\u01a1 \u0111\u1ed3 kh\u1ed1i ngu\u1ed3n xung<\/figcaption><\/figure>\n<\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Kh\u1ed1i ngu\u1ed3n xung g\u1ed3m c\u00e1c th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n:<\/span><\/div>\n<ul>\n<li style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Kh\u1ed1i dao \u0111\u1ed9ng t\u1ea1o xung<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Kh\u1ed1i c\u00f4ng su\u1ea5t\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Kh\u1ed1i h\u1ed3i ti\u1ebfp so s\u00e1nh \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 r\u1ed9ng xung m\u1ee5c \u0111\u00edch \u1ed5n \u0111\u1ecbnh \u0111i\u1ec7n \u00e1p<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Kh\u1ed1i h\u1ed3i ti\u1ebfp xung \u0111\u1ec3 \u1ed5n \u0111\u1ecbnh t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng.<\/span><\/li>\n<\/ul>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Ri\u00eang ph\u1ea7n ngu\u1ed3n s\u1ea1c v\u00e0 m\u1ed9t s\u1ed1 m\u1ea1ch ngu\u1ed3n chip vi x\u1eed l\u00fd c\u00f3 th\u00eam h\u1ed3i ti\u1ebfp nh\u1eadn d\u1ea1ng d\u00f2ng, ph\u1ee5c v\u1ee5 cho vi\u1ec7c b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i v\u00e0 ch\u1ea1m ch\u1eadp hay ng\u1eaft ngu\u1ed3n s\u1ea1c khi pin \u0111\u1ea7y.<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng ngu\u1ed3n \u1ed5n \u00e1p nh\u01b0 sau:<\/span><\/div>\n<div>\n<figure id=\"attachment_45763\" aria-describedby=\"caption-attachment-45763\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-45763 size-full\" title=\"C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng ngu\u1ed3n \u1ed5n \u00e1p\" src=\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-3.jpg\" alt=\"C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng ngu\u1ed3n \u1ed5n \u00e1p\" width=\"750\" height=\"501\" srcset=\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-3.jpg 750w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-3-300x200.jpg 300w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-3-510x341.jpg 510w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-45763\" class=\"wp-caption-text\">C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng ngu\u1ed3n \u1ed5n \u00e1p<\/figcaption><\/figure>\n<\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\"><strong>C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n xung<\/strong>\u00a0c\u01a1 b\u1ea3n d\u1ef1a tr\u00ean vi\u1ec7c \u0111i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung (PWM) hay b\u0103m xung, ngh\u0129a l\u00e0 l\u00e0m cho th\u1eddi gian xu\u1ea5t hi\u1ec7n xung (Ton- Time on) \u0111i\u1ec1u khi\u1ec3n Mosfet k\u00eanh N d\u00e2\u0303n ho\u0103\u0323c t\u0103\u0301t v\u1edbi th\u1eddi gian t\u01b0\u01a1ng \u1ee9ng ma\u0300 chu ky\u0300 kh\u00f4ng thay \u0111\u00f4\u0309i.<\/span><\/div>\n<div><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Vi\u0301 du\u0323: Ngu\u1ed3n c\u1ea7n l\u1ea5y ra tr\u00ean \u0111\u1ea7u t\u1ee5 l\u00e0 3v, l\u00fac \u0111\u00f3 3v n\u00e0y nh\u1edd c\u1ea7u ph\u00e2n \u00e1p R1, R2 l\u1ea5y ra \u0111i\u00ea\u0323n a\u0301p v\u1ec1 kh\u1ed1i so s\u00e1nh, h\u1ea7u h\u1ebft c\u00e1c \u0111\u01b0\u1eddng h\u1ed3i ti\u00ea\u0301p 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 b\u1eb1ng 0 n\u00ean \u00e1p h\u1ed3i v\u1ec1 n\u00e0y (FB) t\u00ednh theo \u0111\u1ecbnh l\u00fd c\u1ea7u ph\u00e2n th\u1ebf <strong>Vout = Vin*R2\/(R1+R2)<\/strong>. 3v n\u00e0y v\u1ec1 c\u1eaft xung tam gi\u00e1c trong kh\u1ed1i giao \u0111\u1ed9ng \u1edf c\u00e1c \u0111i\u1ec3m 1&#8242;, 2&#8242;, 3&#8242; v\u1edbi chi\u1ec1u l\u00ean c\u1ee7a xung ta c\u00f3 \u0111\u01b0\u1ee3c xung vu\u00f4ng Ton1 c\u00f3 th\u1eddi gian t\u1eeb 1&#8242; \u0111\u1ebfn 2&#8242;. \u1ee8ng v\u1edbi chi\u1ec1u xu\u1ed1ng c\u1ee7a xung ta c\u00f3 \u0111\u01b0\u1ee3c xung vu\u00f4ng Toff1 k\u00e9o d\u00e0i t\u1eeb 2&#8242; \u0111\u1ebfn 3&#8242;, v\u1edbi xung vu\u00f4ng (B) n\u00e0y s\u1ebd \u0111i\u1ec1u khi\u1ec3n Mosfet d\u1eabn ho\u0103\u0323c t\u1eaft cho ra \u0111i\u1ec7n th\u1ebf l\u00e0 3v theo thi\u1ebft k\u1ebf.<\/span><\/div>\n<div><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Ngu\u00f4\u0300n l\u00e2\u0301y ra th\u00e2\u0301p h\u01a1n 3v, qua c\u1ea7u ph\u00e2n \u00e1p, \u00e1p h\u1ed3i v\u1ec1 th\u1ea5p 2,8v ch\u0103\u0309ng ha\u0323n nh\u01b0 h\u00ecnh tr\u00ean (C). 2,8v n\u00e0y c\u1eaft xung tam gi\u00e1c t\u1ea1i c\u00e1c \u0111i\u1ec3m 1&#8243;, 2&#8243;, 3&#8243;. V\u1edbi chi\u1ec1u l\u00ean c\u1ee7a xung ta c\u00f3 xung vu\u00f4ng Ton3 k\u00e9o d\u00e0i t\u1eeb 1&#8243; \u0111\u1ebfn 2&#8243; m\u1edf r\u1ed9ng h\u01a1n tru\u1edbc v\u00e0 \u1ee9ng v\u1edbi chi\u1ec1u xu\u1ed1ng cu\u0309a xung ta c\u00f3 xung vu\u00f4ng Toff3 thu h\u1eb9p l\u1ea1i k\u00e9o d\u00e0i t\u1eeb 2&#8243; -3&#8243;.<\/span><\/div>\n<div><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Ngu\u00f4\u0300n l\u00e2\u0301y ra cao h\u01a1n 3v, qua c\u1ea7u ph\u00e2n \u00e1p, h\u1ed3i v\u1ec1 v\u1edbi \u0111i\u00ea\u0323n a\u0301p FB l\u00e0 3.2v, \u0111i\u1ec7n \u00e1p n\u00e0y (A) 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.<\/span><\/div>\n<div><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Ton (Time on) m\u1edf r\u1ed9ng hay thu h\u1eb9p s\u1ebd \u0111\u1ebfn \u0111i\u1ec1u khi\u1ec3n Mosfet l\u00e0m t\u0103ng gi\u1ea3m th\u1eddi gian d\u1eabn, t\u1eaft c\u1ee7a Mosfet s\u1ebd \u0111i\u1ec1u ch\u1ec9nh lu\u00f4n cho ra 3v theo thi\u1ebft k\u1ebf.<\/span><\/div>\n<div><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">Nh\u01b0 v\u1eady d\u00f9 Ton, Toff \u00a0thay \u0111\u1ed5i nh\u01b0ng chu k\u1ef3 T kh\u00f4ng \u0111\u1ed5i ch\u1ec9 c\u00f3 s\u1ef1 chuy\u00ea\u0309n d\u1ecbch pha.<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">\u0110i\u1ec1u ki\u1ec7n c\u01a1 b\u1ea3n c\u1ee7a kh\u1ed1i ngu\u1ed3n xung ho\u1ea1t \u0111\u1ed9ng:<\/span><\/div>\n<div>\n<figure id=\"attachment_45764\" aria-describedby=\"caption-attachment-45764\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-45764 size-full\" title=\"\u0110i\u1ec1u ki\u1ec7n c\u01a1 b\u1ea3n c\u1ee7a kh\u1ed1i ngu\u1ed3n xung ho\u1ea1t \u0111\u1ed9ng\" src=\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-5.jpg\" alt=\"\u0110i\u1ec1u ki\u1ec7n c\u01a1 b\u1ea3n c\u1ee7a kh\u1ed1i ngu\u1ed3n xung ho\u1ea1t \u0111\u1ed9ng\" width=\"750\" height=\"363\" srcset=\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-5.jpg 750w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-5-300x145.jpg 300w, https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/co-che-hoat-dong-cua-nguon-xung-5-510x247.jpg 510w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-45764\" class=\"wp-caption-text\">\u0110i\u1ec1u ki\u1ec7n c\u01a1 b\u1ea3n c\u1ee7a kh\u1ed1i ngu\u1ed3n xung ho\u1ea1t \u0111\u1ed9ng<\/figcaption><\/figure>\n<\/div>\n<div style=\"text-align: justify;\"><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">1. Ngu\u1ed3n n\u1ed1i VCC cho IC dao \u0111\u1ed9ng v\u00e0 kh\u1ed1i l\u00e1i xung (th\u01b0\u1eddng d\u00f9ng ngu\u1ed3n 5v t\u00e1ch xung vu\u00f4ng th\u00e0nh 2 pha ng\u01b0\u1ee3c chi\u1ec1u nhau), <\/span><span style=\"font-size: 17px;\">Vin (Vol input) c\u1ea5p cho mosfet ng\u01b0\u1ee3c.<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">2. Ton (Time on) t\u1ea7n s\u1ed1 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u1ea1ch ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec7n \u00e1p Ton.<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">3. Xung vu\u00f4ng \u0111\u01b0\u1ee3c t\u00e1ch \u0111i\u1ec1u khi\u1ec3n c\u1eb7p mosfet d\u01b0\u1edbi d\u1ea1ng \u0111\u00f3ng\/ ng\u1eaft hay k\u00e9o \u0111\u1ea9y, BST d\u00f9ng ki\u1ec3m tra h\u1ed3i ti\u1ebfp xung.<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">4. Xung vu\u00f4ng \u0111\u01b0\u1ee3c gi\u1eef l\u1ea1i t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a c\u1eb7p mosfet, \u0111i qua cu\u1ed9n d\u00e2y l\u1ecdc th\u00e0nh \u0111i\u1ec7p \u00e1p DC, \u0111i\u1ec7n \u00e1p tr\u00ean \u0111\u01b0\u1ee3c t\u1ee5 l\u1ecdc t\u01b0\u01a1ng \u0111\u1ed1i b\u1eb1ng ph\u1eb3ng sau \u0111\u00f3 \u0111\u01b0\u1ee3c c\u1ea5p cho t\u1ea3i ti\u00eau th\u1ee5.<\/span><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">5. FB (Feed-Back) h\u1ed3i ti\u1ebfp duy tr\u00ec dao \u0111\u1ed9ng.<\/span><\/div>\n<div><\/div>\n<div style=\"text-align: justify;\"><span style=\"font-size: 17px;\">B\u00e0i vi\u1ebft \u0111\u01b0\u1ee3c chuy\u00ean vi\u00ean k\u1ef9 thu\u1eadt\u00a0<i>Nguy\u1ec5n T\u00fa Ngh\u0129a<\/i>\u00a0chia s\u1ebb t\u1edbi c\u00e1c b\u1ea1n v\u1ec1\u00a0<strong>c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n xung<\/strong>, hy v\u1ecdng b\u00e0i vi\u1ebft s\u1ebd gi\u00fap \u00edch \u0111\u01b0\u1ee3c cho c\u00e1c b\u1ea1n.<\/span><\/div>\n<div>\n<p><i>M\u1ecdi chi ti\u1ebft xin vui l\u00f2ng li\u00ean h\u1ec7:<\/i><\/p>\n<p><strong>C\u00d4NG TY C\u1ed4 PH\u1ea6N H\u1eccC VI\u1ec6N IT<\/strong><\/p>\n<p><strong>MST: 010873378<\/strong><\/p>\n<p><strong>Hotline: 0981 223 001<\/strong><\/p>\n<p><strong>Facebook:<\/strong>\u00a0<a href=\"http:\/\/www.fb.com\/hocvienit\" target=\"_blank\" rel=\"noopener\">www.fb.com\/hocvienit<\/a><\/p>\n<p><strong>\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>\u00a0<a href=\"http:\/\/bit.ly\/Youtube_HOCVIENiT\" target=\"_blank\" rel=\"noopener\">http:\/\/bit.ly\/Youtube_HOCVIENiT<\/a><\/p>\n<p><strong>Tham gia c\u1ed9ng \u0111\u1ed3ng H\u1ecdc vi\u1ec7n IT.vn t\u1ea1i:<\/strong>\u00a0<a href=\"https:\/\/www.facebook.com\/groups\/www.hocvienit.vn\/\" target=\"_blank\" rel=\"noopener\">https:\/\/www.facebook.com\/groups\/www.hocvienit.vn\/<\/a><br \/>\n<i><\/i><\/p>\n<p><strong><i>H\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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Ngu\u1ed3n xung, n\u00f3i c\u00e1ch kh\u00e1c b\u1ed9 chuy\u1ec3n \u0111\u1ed5i DC-DC (DC converter). C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng ngu\u1ed3n xung \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng h\u1ea7u h\u1ebft tr\u00ean c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed, v\u1edbi vi\u1ec7c \u0111i\u1ec1u ch\u1ebf ra xung vu\u00f4ng c\u00f3 t\u1ea7n s\u1ed1 v\u00e0o kho\u1ea3ng 300khz. <\/p>\n","protected":false},"author":95,"featured_media":12402,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96,94],"tags":[662],"_links":{"self":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/3025"}],"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=3025"}],"version-history":[{"count":0,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/3025\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/media\/12402"}],"wp:attachment":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3025"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3025"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3025"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}