{"id":42804,"date":"2024-11-21T15:31:39","date_gmt":"2024-11-21T20:31:39","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/deep-dive-into-oscillator-design-the-heartbeat-of-ultrasonic-generator-circuits\/"},"modified":"2025-01-21T07:07:17","modified_gmt":"2025-01-21T12:07:17","slug":"deep-dive-into-oscillator-design-the-heartbeat-of-ultrasonic-generator-circuits","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/deep-dive-into-oscillator-design-the-heartbeat-of-ultrasonic-generator-circuits\/","title":{"rendered":"Kh\u00e1m ph\u00e1 Chi Ti\u1ebft Thi\u1ebft K\u1ebf B\u1ed9 Dao \u0110\u1ed9ng Si\u00eau \u00c2m"},"content":{"rendered":"<p>M\u00e1y ph\u00e1t si\u00eau \u00e2m, v\u1edbi \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i t\u1eeb y t\u1ebf \u0111\u1ebfn c\u00f4ng nghi\u1ec7p, ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i: m\u1ea1ch dao \u0111\u1ed9ng. M\u1ea1ch dao \u0111\u1ed9ng ch\u00ednh l\u00e0 &quot;tr\u00e1i tim&quot; c\u1ee7a h\u1ec7 th\u1ed1ng, t\u1ea1o ra t\u00edn hi\u1ec7u \u0111i\u1ec7n dao \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 si\u00eau \u00e2m, sau \u0111\u00f3 \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i v\u00e0 chuy\u1ec3n \u0111\u1ed5i th\u00e0nh s\u00f3ng \u00e2m b\u1edfi \u0111\u1ea7u d\u00f2.  Hi\u1ec3u r\u00f5 thi\u1ebft k\u1ebf v\u00e0 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u1ea1ch dao \u0111\u1ed9ng l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng si\u00eau \u00e2m. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o ph\u00e2n t\u00edch thi\u1ebft k\u1ebf m\u1ea1ch dao \u0111\u1ed9ng, tr\u00e1i tim c\u1ee7a c\u00e1c m\u1ea1ch t\u1ea1o s\u00f3ng si\u00eau \u00e2m.<\/p>\n<h3>C\u00e1c lo\u1ea1i m\u1ea1ch dao \u0111\u1ed9ng ph\u1ed5 bi\u1ebfn trong m\u00e1y ph\u00e1t si\u00eau \u00e2m<\/h3>\n<p>C\u00f3 nhi\u1ec1u lo\u1ea1i m\u1ea1ch dao \u0111\u1ed9ng kh\u00e1c nhau \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u00e1y ph\u00e1t si\u00eau \u00e2m, m\u1ed7i lo\u1ea1i c\u00f3 \u01b0u \u0111i\u1ec3m v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m ri\u00eang. M\u1ed9t s\u1ed1 lo\u1ea1i ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>M\u1ea1ch dao \u0111\u1ed9ng Colpitts:<\/strong> S\u1eed d\u1ee5ng hai t\u1ee5 \u0111i\u1ec7n v\u00e0 m\u1ed9t cu\u1ed9n c\u1ea3m \u0111\u1ec3 t\u1ea1o ra dao \u0111\u1ed9ng. \u01afu \u0111i\u1ec3m c\u1ee7a m\u1ea1ch n\u00e0y l\u00e0 \u0111\u01a1n gi\u1ea3n, d\u1ec5 thi\u1ebft k\u1ebf v\u00e0 c\u00f3 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1ea7n s\u1ed1 t\u1ed1t.<\/li>\n<li><strong>M\u1ea1ch dao \u0111\u1ed9ng Hartley:<\/strong> S\u1eed d\u1ee5ng hai cu\u1ed9n c\u1ea3m v\u00e0 m\u1ed9t t\u1ee5 \u0111i\u1ec7n. M\u1ea1ch Hartley th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi c\u1ea7n d\u1ea3i t\u1ea7n s\u1ed1 r\u1ed9ng.<\/li>\n<li><strong>M\u1ea1ch dao \u0111\u1ed9ng tinh th\u1ec3:<\/strong> S\u1eed d\u1ee5ng tinh th\u1ec3 th\u1ea1ch anh \u0111\u1ec3 t\u1ea1o ra dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 r\u1ea5t ch\u00ednh x\u00e1c v\u00e0 \u1ed5n \u0111\u1ecbnh.  M\u1ea1ch n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/li>\n<li><strong>M\u1ea1ch dao \u0111\u1ed9ng RC:<\/strong> S\u1eed d\u1ee5ng \u0111i\u1ec7n tr\u1edf v\u00e0 t\u1ee5 \u0111i\u1ec7n \u0111\u1ec3 t\u1ea1o ra dao \u0111\u1ed9ng. M\u1ea1ch n\u00e0y \u0111\u01a1n gi\u1ea3n v\u00e0 r\u1ebb ti\u1ec1n, nh\u01b0ng \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1ea7n s\u1ed1 k\u00e9m h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i m\u1ea1ch kh\u00e1c.<\/li>\n<\/ul>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Lo\u1ea1i m\u1ea1ch dao \u0111\u1ed9ng<\/th>\n<th>\u01afu \u0111i\u1ec3m<\/th>\n<th>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Colpitts<\/td>\n<td>\u0110\u01a1n gi\u1ea3n, \u1ed5n \u0111\u1ecbnh<\/td>\n<td>D\u1ea3i t\u1ea7n s\u1ed1 h\u1eb9p h\u01a1n Hartley<\/td>\n<\/tr>\n<tr>\n<td>Hartley<\/td>\n<td>D\u1ea3i t\u1ea7n s\u1ed1 r\u1ed9ng<\/td>\n<td>\u0110\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1ea7n s\u1ed1 k\u00e9m h\u01a1n Colpitts<\/td>\n<\/tr>\n<tr>\n<td>Tinh th\u1ec3<\/td>\n<td>\u0110\u1ed9 ch\u00ednh x\u00e1c v\u00e0 \u1ed5n \u0111\u1ecbnh cao<\/td>\n<td>T\u1ea7n s\u1ed1 c\u1ed1 \u0111\u1ecbnh, kh\u00f3 \u0111i\u1ec1u ch\u1ec9nh<\/td>\n<\/tr>\n<tr>\n<td>RC<\/td>\n<td>\u0110\u01a1n gi\u1ea3n, r\u1ebb ti\u1ec1n<\/td>\n<td>\u0110\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1ea7n s\u1ed1 k\u00e9m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn thi\u1ebft k\u1ebf m\u1ea1ch dao \u0111\u1ed9ng<\/h3>\n<p>Thi\u1ebft k\u1ebf m\u1ea1ch dao \u0111\u1ed9ng c\u1ea7n xem x\u00e9t nhi\u1ec1u y\u1ebfu t\u1ed1 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t t\u1ed1i \u01b0u:<\/p>\n<ul>\n<li><strong>T\u1ea7n s\u1ed1 ho\u1ea1t \u0111\u1ed9ng:<\/strong> T\u1ea7n s\u1ed1 si\u00eau \u00e2m mong mu\u1ed1n s\u1ebd quy\u1ebft \u0111\u1ecbnh c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a m\u1ea1ch dao \u0111\u1ed9ng.<\/li>\n<li><strong>C\u00f4ng su\u1ea5t \u0111\u1ea7u ra:<\/strong> C\u00f4ng su\u1ea5t c\u1ee7a m\u1ea1ch dao \u0111\u1ed9ng c\u1ea7n ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u c\u1ee7a \u1ee9ng d\u1ee5ng.<\/li>\n<li><strong>\u0110\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1ea7n s\u1ed1:<\/strong>  \u0110\u1ed9 \u1ed5n \u0111\u1ecbnh t\u1ea7n s\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 hi\u1ec7u qu\u1ea3 c\u1ee7a h\u1ec7 th\u1ed1ng si\u00eau \u00e2m.<\/li>\n<li><strong>Nhi\u1ec5u:<\/strong>  C\u1ea7n gi\u1ea3m thi\u1ec3u nhi\u1ec5u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00edn hi\u1ec7u si\u00eau \u00e2m r\u00f5 r\u00e0ng v\u00e0 ch\u00ednh x\u00e1c.<\/li>\n<li><strong>\u0110i\u1ec7n \u00e1p cung c\u1ea5p:<\/strong>  \u0110i\u1ec7n \u00e1p cung c\u1ea5p cho m\u1ea1ch dao \u0111\u1ed9ng c\u1ea7n \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p.<\/li>\n<\/ul>\n<h3>T\u1ed1i \u01b0u h\u00f3a m\u1ea1ch dao \u0111\u1ed9ng cho hi\u1ec7u su\u1ea5t cao<\/h3>\n<p>\u0110\u1ec3 t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ea1ch dao \u0111\u1ed9ng, c\u1ea7n xem x\u00e9t c\u00e1c y\u1ebfu t\u1ed1 sau:<\/p>\n<ul>\n<li><strong>L\u1ef1a ch\u1ecdn linh ki\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng cao:<\/strong> S\u1eed d\u1ee5ng linh ki\u1ec7n c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 \u1ed5n \u0111\u1ecbnh cao s\u1ebd c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ea1ch dao \u0111\u1ed9ng.<\/li>\n<li><strong>Thi\u1ebft k\u1ebf m\u1ea1ch in h\u1ee3p l\u00fd:<\/strong>  B\u1ed1 tr\u00ed linh ki\u1ec7n tr\u00ean m\u1ea1ch in c\u1ea7n \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ec3 gi\u1ea3m thi\u1ec3u nhi\u1ec5u v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00edn hi\u1ec7u \u1ed5n \u0111\u1ecbnh.<\/li>\n<li><strong>\u0110i\u1ec1u ch\u1ec9nh v\u00e0 ki\u1ec3m tra:<\/strong> Sau khi l\u1eafp r\u00e1p, c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh v\u00e0 ki\u1ec3m tra m\u1ea1ch dao \u0111\u1ed9ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang theo y\u00eau c\u1ea7u.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 \u1ee9ng d\u1ee5ng v\u1edbi Beijing Ultrasonic (n\u1ebfu c\u1ea7n thi\u1ebft)<\/h3>\n<p>N\u1ebfu c\u1ea7n m\u1ed9t v\u00ed d\u1ee5 c\u1ee5 th\u1ec3, ta c\u00f3 th\u1ec3 xem x\u00e9t m\u1ed9t \u1ee9ng d\u1ee5ng l\u00e0m s\u1ea1ch b\u1eb1ng si\u00eau \u00e2m s\u1eed d\u1ee5ng \u0111\u1ea7u d\u00f2 t\u1eeb Beijing Ultrasonic.  T\u1ea7n s\u1ed1 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ea7u d\u00f2 s\u1ebd quy\u1ebft \u0111\u1ecbnh t\u1ea7n s\u1ed1 c\u1ee7a m\u1ea1ch dao \u0111\u1ed9ng. V\u00ed d\u1ee5, n\u1ebfu \u0111\u1ea7u d\u00f2 ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 40kHz, m\u1ea1ch dao \u0111\u1ed9ng c\u1ea7n \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u1ea1o ra t\u00edn hi\u1ec7u \u1edf t\u1ea7n s\u1ed1 n\u00e0y.<\/p>\n<p>Vi\u1ec7c thi\u1ebft k\u1ebf m\u1ea1ch dao \u0111\u1ed9ng l\u00e0 m\u1ed9t b\u01b0\u1edbc quan tr\u1ecdng trong vi\u1ec7c x\u00e2y d\u1ef1ng m\u1ed9t h\u1ec7 th\u1ed1ng si\u00eau \u00e2m hi\u1ec7u qu\u1ea3.  Hi\u1ec3u r\u00f5 c\u00e1c nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng, c\u00e1c lo\u1ea1i m\u1ea1ch dao \u0111\u1ed9ng v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn thi\u1ebft k\u1ebf s\u1ebd gi\u00fap k\u1ef9 s\u01b0 t\u1ea1o ra nh\u1eefng h\u1ec7 th\u1ed1ng si\u00eau \u00e2m \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c c\u00e1c y\u00eau c\u1ea7u kh\u1eaft khe c\u1ee7a nhi\u1ec1u \u1ee9ng d\u1ee5ng kh\u00e1c nhau.  T\u1eeb vi\u1ec7c l\u1ef1a ch\u1ecdn linh ki\u1ec7n cho \u0111\u1ebfn t\u1ed1i \u01b0u h\u00f3a m\u1ea1ch, m\u1ed7i b\u01b0\u1edbc \u0111\u1ec1u \u0111\u00f3ng g\u00f3p v\u00e0o hi\u1ec7u su\u1ea5t cu\u1ed1i c\u00f9ng c\u1ee7a h\u1ec7 th\u1ed1ng.  S\u1ef1 ph\u00e1t tri\u1ec3n li\u00ean t\u1ee5c c\u1ee7a c\u00f4ng ngh\u1ec7 c\u0169ng m\u1edf ra nh\u1eefng c\u01a1 h\u1ed9i m\u1edbi cho vi\u1ec7c thi\u1ebft k\u1ebf m\u1ea1ch dao \u0111\u1ed9ng ti\u00ean ti\u1ebfn h\u01a1n, hi\u1ec7u qu\u1ea3 h\u01a1n v\u00e0 \u0111\u00e1ng tin c\u1eady h\u01a1n trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>M\u00e1y ph\u00e1t si\u00eau \u00e2m, v\u1edbi \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i t\u1eeb y t\u1ebf \u0111\u1ebfn c\u00f4ng nghi\u1ec7p, ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i: m\u1ea1ch dao \u0111\u1ed9ng. M\u1ea1ch dao \u0111\u1ed9ng ch\u00ednh l\u00e0 &quot;tr\u00e1i tim&quot; c\u1ee7a h\u1ec7 th\u1ed1ng, t\u1ea1o ra t\u00edn hi\u1ec7u \u0111i\u1ec7n dao \u0111\u1ed9ng \u1edf t\u1ea7n s\u1ed1 si\u00eau \u00e2m, sau \u0111\u00f3 \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i v\u00e0 chuy\u1ec3n<\/p>\n","protected":false},"author":1,"featured_media":42290,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-42804","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/42804","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/comments?post=42804"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/42804\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/42290"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=42804"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=42804"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=42804"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}