{"id":19893,"date":"2025-11-15T02:05:00","date_gmt":"2025-11-14T18:05:00","guid":{"rendered":"https:\/\/viox.com\/?p=19893"},"modified":"2025-11-13T21:21:46","modified_gmt":"2025-11-13T13:21:46","slug":"mechanical-relay-vs-transistor-mosfet","status":"publish","type":"post","link":"https:\/\/test.viox.com\/vi\/mechanical-relay-vs-transistor-mosfet\/","title":{"rendered":"T\u1ea1i sao \"V\u1ee5ng v\u1ec1\" C\u01a1 Ti\u1ebfp t\u1eeb Ch\u1ed1i Ch\u1ebft (M\u1ed8T VIOX k\u1ef9 S\u01b0 Gi\u1ea3i th\u00edch)"},"content":{"rendered":"<div class=\"product-intro\">\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-19894\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Why-the-22Clumsy22-Mechanical-Relay-Refuses-to-Die-A-VIOX-Engineer-Explains.webp\" alt=\"Why the &quot;Clumsy&quot; Mechanical Relay Refuses to Die (A VIOX Engineer Explains)\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Why-the-22Clumsy22-Mechanical-Relay-Refuses-to-Die-A-VIOX-Engineer-Explains.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Why-the-22Clumsy22-Mechanical-Relay-Refuses-to-Die-A-VIOX-Engineer-Explains-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Why-the-22Clumsy22-Mechanical-Relay-Refuses-to-Die-A-VIOX-Engineer-Explains-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Why-the-22Clumsy22-Mechanical-Relay-Refuses-to-Die-A-VIOX-Engineer-Explains-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Why-the-22Clumsy22-Mechanical-Relay-Refuses-to-Die-A-VIOX-Engineer-Explains-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Why-the-22Clumsy22-Mechanical-Relay-Refuses-to-Die-A-VIOX-Engineer-Explains-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Why-the-22Clumsy22-Mechanical-Relay-Refuses-to-Die-A-VIOX-Engineer-Explains-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>B\u1ea1n m\u1edf m\u1ed9t b\u1ed9 \u0111i\u1ec1u khi\u1ec3n nh\u00e0 th\u00f4ng minh hi\u1ec7n \u0111\u1ea1i, c\u00f4ng ngh\u1ec7 cao. N\u00f3 ch\u1ee9a \u0111\u1ea7y c\u00e1c th\u00e0nh ph\u1ea7n g\u1eafn tr\u00ean b\u1ec1 m\u1eb7t si\u00eau nh\u1ecf, b\u1ed9 vi x\u1eed l\u00fd m\u1ea1nh m\u1ebd v\u00e0 chip Wi-Fi.<\/p>\n<p>V\u00e0 sau \u0111\u00f3, n\u1eb1m ngay gi\u1eefa t\u1ea5t c\u1ea3 nh\u1eefng silicon \u0111\u00f3, l\u00e0 m\u1ed9t kh\u1ed1i nh\u1ef1a l\u1edbn, vu\u00f4ng v\u1ee9c. Khi n\u00f3 k\u00edch ho\u1ea1t, n\u00f3 t\u1ea1o ra m\u1ed9t ti\u1ebfng <em>CLICK<\/em>.<\/p>\n<p>\u0110\u00f3 l\u00e0 m\u1ed9t r\u01a1le c\u01a1 kh\u00ed. C\u00f4ng ngh\u1ec7 t\u1eeb nh\u1eefng n\u0103m 1830.<\/p>\n<p>\u0110i\u1ec1u n\u00e0y \u0111\u1eb7t ra m\u1ed9t c\u00e2u h\u1ecfi \u201ct\u1ef1 v\u1ea5n\u201d cho b\u1ea5t k\u1ef3 k\u1ef9 s\u01b0 n\u00e0o: <strong>Trong m\u1ed9t th\u1ebf gi\u1edbi n\u01a1i MOSFET v\u00e0 IGBT r\u1ebb, si\u00eau nh\u1ecf v\u00e0 im l\u1eb7ng, t\u1ea1i sao ch\u00fang ta v\u1eabn ch\u01b0a lo\u1ea1i b\u1ecf r\u01a1le?<\/strong><\/p>\n<p>T\u1ea1i sao ph\u1ea3i d\u1ef1a v\u00e0o m\u1ed9t c\u00e1nh tay kim lo\u1ea1i di chuy\u1ec3n \u0111\u01b0\u1ee3c gi\u1eef b\u1eb1ng l\u00f2 xo khi ch\u00fang ta c\u00f3 v\u1eadt l\u00fd tr\u1ea1ng th\u00e1i r\u1eafn?<\/p>\n<p>C\u00e2u tr\u1ea3 l\u1eddi kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ef1 ho\u00e0i c\u1ed5\u2014m\u00e0 l\u00e0 th\u1ef1c t\u1ebf k\u1ef9 thu\u1eadt l\u1ea1nh l\u00f9ng, kh\u1eafc nghi\u1ec7t. H\u00f3a ra, r\u01a1le \u201cv\u1ee5ng v\u1ec1\u201d c\u00f3 m\u1ed9t si\u00eau n\u0103ng l\u1ef1c m\u00e0 silicon kh\u00f4ng th\u1ec3 sao ch\u00e9p \u0111\u01b0\u1ee3c.<\/p>\n<p>H\u00e3y ph\u00e2n t\u00edch tr\u1eadn chi\u1ebfn gi\u1eefa <strong>C\u00f4ng t\u1eafc c\u1ee9ng (R\u01a1le)<\/strong> v\u00e0 <strong>C\u00f4ng t\u1eafc m\u1ec1m (Transistor)<\/strong>.<\/p>\n<h2>1. B\u1ea3o m\u1eadt \u201cKhe h\u1edf kh\u00f4ng kh\u00ed\u201d: T\u1ea1i sao R\u01a1le l\u00e0 T\u01b0\u1eddng l\u1eeda T\u1ed1i th\u01b0\u1ee3ng<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19895\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Air-Gap22-Security-Why-Relays-Are-the-Ultimate-Firewall.webp\" alt=\"The &quot;Air Gap&quot; Security: Why Relays Are the Ultimate Firewall\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Air-Gap22-Security-Why-Relays-Are-the-Ultimate-Firewall.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Air-Gap22-Security-Why-Relays-Are-the-Ultimate-Firewall-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Air-Gap22-Security-Why-Relays-Are-the-Ultimate-Firewall-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Air-Gap22-Security-Why-Relays-Are-the-Ultimate-Firewall-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Air-Gap22-Security-Why-Relays-Are-the-Ultimate-Firewall-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Air-Gap22-Security-Why-Relays-Are-the-Ultimate-Firewall-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Air-Gap22-Security-Why-Relays-Are-the-Ultimate-Firewall-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>L\u00fd do #1 khi\u1ebfn r\u01a1le v\u1eabn l\u00e0 vua l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <strong>C\u00e1ch ly \u0111i\u1ec7n<\/strong>.<\/p>\n<p>H\u00e3y ngh\u0129 v\u1ec1 m\u1ed9t MOSFET (transistor). Ngay c\u1ea3 khi n\u00f3 \u1edf tr\u1ea1ng th\u00e1i \u201cT\u1eaeT\u201d, v\u1eabn c\u00f3 m\u1ed9t k\u1ebft n\u1ed1i v\u1eadt l\u00fd, h\u00f3a h\u1ecdc gi\u1eefa t\u1ea3i \u0111i\u1ec7n \u00e1p cao v\u00e0 b\u1ed9 vi \u0111i\u1ec1u khi\u1ec3n nh\u1ea1y c\u1ea3m c\u1ee7a b\u1ea1n. Ch\u00fang \u0111ang chia s\u1ebb m\u1ed9t mi\u1ebfng silicon. Th\u00f4ng th\u01b0\u1eddng, ch\u00fang ph\u1ea3i chia s\u1ebb m\u1ed9t tham chi\u1ebfu \u201cMass\u201d.<\/p>\n<p>N\u1ebfu MOSFET \u0111\u00f3 b\u1ecb l\u1ed7i nghi\u00eam tr\u1ecdng (v\u00ed d\u1ee5: m\u1ed9t \u0111i\u1ec7n \u00e1p t\u0103ng \u0111\u1ed9t bi\u1ebfn xuy\u00ean qua l\u1edbp oxit c\u1ed5ng), th\u00ec ngu\u1ed3n \u0111i\u1ec7n l\u01b0\u1edbi 240V \u0111\u00f3 kh\u00f4ng ch\u1ec9 \u1edf tr\u00ean ph\u00eda t\u1ea3i. N\u00f3 di chuy\u1ec3n <em>ng\u01b0\u1ee3c l\u1ea1i<\/em>, th\u1eb3ng v\u00e0o Arduino ho\u1eb7c Raspberry Pi 5V c\u1ee7a b\u1ea1n.<\/p>\n<p><strong>K\u1ebft qu\u1ea3?<\/strong> B\u1ed9 vi x\u1eed l\u00fd c\u1ee7a b\u1ea1n b\u1ecb ch\u00e1y ngay l\u1eadp t\u1ee9c.<\/p>\n<h3>\u01afu \u0111i\u1ec3m c\u1ee7a R\u01a1le<\/h3>\n<p>R\u01a1le kh\u00f4ng c\u00f3 k\u1ebft n\u1ed1i \u0111i\u1ec7n gi\u1eefa cu\u1ed9n d\u00e2y (ph\u00eda \u0111i\u1ec1u khi\u1ec3n) v\u00e0 c\u00e1c ti\u1ebfp \u0111i\u1ec3m (ph\u00eda t\u1ea3i). Ch\u00fang ch\u1ec9 \u0111\u01b0\u1ee3c gh\u00e9p n\u1ed1i b\u1eb1ng m\u1ed9t <strong>t\u1eeb tr\u01b0\u1eddng<\/strong>. B\u00ean trong h\u1ed9p, c\u00f3 m\u1ed9t <strong>Khe h\u1edf kh\u00f4ng kh\u00ed<\/strong>.<\/p>\n<ul>\n<li><strong>T\u00ecnh hu\u1ed1ng:<\/strong> \u0110\u1ed9ng c\u01a1 240V c\u1ee7a b\u1ea1n b\u1ecb \u0111o\u1ea3n m\u1ea1ch v\u00e0 g\u1eedi m\u1ed9t d\u00f2ng \u0111i\u1ec7n t\u0103ng v\u1ecdt l\u1edbn tr\u1edf l\u1ea1i \u0111\u01b0\u1eddng d\u00e2y.<\/li>\n<li><strong>R\u01a1le:<\/strong> C\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u00f3 th\u1ec3 b\u1ecb h\u00e0n d\u00ednh. V\u1ecf nh\u1ef1a c\u00f3 th\u1ec3 b\u1ecb n\u00f3ng ch\u1ea3y. Nh\u01b0ng b\u1ed9 vi \u0111i\u1ec1u khi\u1ec3n c\u1ee7a b\u1ea1n? N\u00f3 an to\u00e0n. S\u1ef1 t\u0103ng v\u1ecdt kh\u00f4ng th\u1ec3 v\u01b0\u1ee3t qua khe h\u1edf kh\u00f4ng kh\u00ed \u0111\u1ebfn cu\u1ed9n d\u00e2y.<\/li>\n<\/ul>\n<blockquote>\n<p><strong>Pro-M\u1eb9o:<\/strong> Ch\u00fang ta g\u1ecdi \u0111\u00e2y l\u00e0 \u201cH\u00e0o\u201d. N\u1ebfu b\u1ea1n \u0111ang thi\u1ebft k\u1ebf m\u1ed9t m\u1ea1ch m\u00e0 logic \u0111i\u1ec1u khi\u1ec3n ph\u1ea3i s\u1ed1ng s\u00f3t ngay c\u1ea3 khi ph\u00eda t\u1ea3i ph\u00e1t n\u1ed5, b\u1ea1n c\u1ea7n m\u1ed9t r\u01a1le. N\u00f3 l\u00e0 l\u1edbp hy sinh cu\u1ed1i c\u00f9ng.<\/p>\n<\/blockquote>\n<p>C\u00f3 m\u1ed9t ph\u01b0\u01a1ng ch\u00e2m k\u1ef9 thu\u1eadt c\u1ed5 \u0111i\u1ec3n: <em>\u201cB\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng cu\u1ed9n d\u00e2y 12V \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n l\u01b0\u1edbi 240V v\u00e0 kh\u00f4ng bao gi\u1edd ph\u1ea3i lo l\u1eafng v\u1ec1 s\u1ef1 kh\u00e1c bi\u1ec7t \u0111i\u1ec7n \u00e1p.\u201d<\/em> \u0110\u00e2y l\u00e0 s\u1ee9c m\u1ea1nh c\u1ee7a <a href=\"https:\/\/test.viox.com\/vi\/stop-wiring-failures-the-engineers-guide-to-dry-vs-wet-contacts\/\"><strong>Ti\u1ebfp \u0111i\u1ec3m kh\u00f4<\/strong><\/a>.<\/p>\n<h2>2. C\u00f4ng t\u1eafc \u201cKh\u00f4ng n\u00e3o\u201d: AC, DC, N\u00f3 Kh\u00f4ng Quan T\u00e2m<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-19896\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Brainless22-Switch-AC-DC-It-Doesnt-Care.webp\" alt=\"The &quot;Brainless&quot; Switch: AC, DC, It Doesn't Care\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Brainless22-Switch-AC-DC-It-Doesnt-Care.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Brainless22-Switch-AC-DC-It-Doesnt-Care-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Brainless22-Switch-AC-DC-It-Doesnt-Care-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Brainless22-Switch-AC-DC-It-Doesnt-Care-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Brainless22-Switch-AC-DC-It-Doesnt-Care-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Brainless22-Switch-AC-DC-It-Doesnt-Care-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-22Brainless22-Switch-AC-DC-It-Doesnt-Care-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>Transistor r\u1ea5t kh\u00f3 t\u00ednh. Ch\u00fang l\u00e0 c\u00e1c thi\u1ebft b\u1ecb b\u00e1n d\u1eabn, c\u00f3 ngh\u0129a l\u00e0 ch\u00fang c\u00f3 c\u00e1c quy t\u1eafc.<\/p>\n<ul>\n<li><strong>BJT\/MOSFET<\/strong> v\u1ed1n d\u0129 l\u00e0 <strong>DC (D\u00f2ng \u0111i\u1ec7n m\u1ed9t chi\u1ec1u)<\/strong> thi\u1ebft b\u1ecb m\u1ed9t chi\u1ec1u. Ch\u00fang cho ph\u00e9p d\u00f2ng \u0111i\u1ec7n ch\u1ea1y theo m\u1ed9t h\u01b0\u1edbng (Drain to Source).<\/li>\n<li><strong>V\u1ea5n \u0110\u1ec1 L\u00e0:<\/strong> N\u1ebfu b\u1ea1n mu\u1ed1n chuy\u1ec3n \u0111\u1ed5i 120V AC (D\u00f2ng \u0111i\u1ec7n xoay chi\u1ec1u) b\u1eb1ng MOSFET, b\u1ea1n s\u1ebd g\u1eb7p r\u1eafc r\u1ed1i. D\u00f2ng \u0111i\u1ec7n \u0111\u1ea3o chi\u1ec1u 60 l\u1ea7n m\u1ed9t gi\u00e2y. M\u1ed9t MOSFET duy nh\u1ea5t s\u1ebd ch\u1eb7n m\u1ed9t n\u1eeda s\u00f3ng v\u00e0 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t diode \u1edf n\u1eeda c\u00f2n l\u1ea1i. B\u1ea1n c\u1ea7n hai MOSFET m\u1eafc song song ng\u01b0\u1ee3c chi\u1ec1u ho\u1eb7c m\u1ed9t Triac, c\u1ed9ng v\u1edbi m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n ph\u1ee9c t\u1ea1p.<\/li>\n<\/ul>\n<h3>\u01afu \u0111i\u1ec3m c\u1ee7a R\u01a1le<\/h3>\n<p>R\u01a1le ch\u1ec9 l\u00e0 hai mi\u1ebfng kim lo\u1ea1i ch\u1ea1m v\u00e0o nhau.<\/p>\n<ul>\n<li><strong>Ph\u00e2n c\u1ef1c:<\/strong> N\u00f3 kh\u00f4ng quan t\u00e2m.<\/li>\n<li><strong>H\u01b0\u1edbng:<\/strong> N\u00f3 kh\u00f4ng quan t\u00e2m.<\/li>\n<li><strong>Lo\u1ea1i \u0111i\u1ec7n \u00e1p:<\/strong> AC? DC? T\u00edn hi\u1ec7u \u00e2m thanh? D\u1eef li\u1ec7u? N\u00f3 kh\u00f4ng quan t\u00e2m.<\/li>\n<\/ul>\n<p>Khi b\u1ea1n cung c\u1ea5p cho kh\u00e1ch h\u00e0ng m\u1ed9t \u0111\u1ea7u ra r\u01a1le, b\u1ea1n \u0111ang cung c\u1ea5p cho h\u1ecd m\u1ed9t ch\u00eca kh\u00f3a v\u1ea1n n\u0103ng. H\u1ecd c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i m\u1ed9t solenoid 24V DC, m\u1ed9t qu\u1ea1t 120V AC ho\u1eb7c m\u1ed9t t\u00edn hi\u1ec7u \u00e2m thanh m\u1ee9c milivolt. R\u01a1le x\u1eed l\u00fd t\u1ea5t c\u1ea3 ch\u00fang v\u1edbi \u0111\u1ed9 s\u1ee5t \u00e1p b\u1eb1ng kh\u00f4ng v\u00e0 d\u00f2ng \u201cr\u00f2 r\u1ec9\u201d b\u1eb1ng kh\u00f4ng.<\/p>\n<blockquote>\n<p><strong>Pro-M\u1eb9o:<\/strong> N\u1ebfu b\u1ea1n kh\u00f4ng bi\u1ebft <em>nh\u1eefng g\u00ec<\/em> ng\u01b0\u1eddi d\u00f9ng s\u1ebd k\u1ebft n\u1ed1i v\u1edbi \u0111\u1ea7u ra c\u1ee7a b\u1ea1n, h\u00e3y s\u1eed d\u1ee5ng r\u01a1le. \u0110\u1ea7u ra transistor y\u00eau c\u1ea7u ng\u01b0\u1eddi d\u00f9ng ph\u1ea3i kh\u1edbp \u0111i\u1ec7n \u00e1p v\u00e0 c\u1ef1c t\u00ednh m\u1ed9t c\u00e1ch ho\u00e0n h\u1ea3o. R\u01a1le ch\u1ec9 n\u00f3i, \u201cT\u00f4i k\u1ebft n\u1ed1i A v\u1edbi B.\u201d<\/p>\n<\/blockquote>\n<h2>3. N\u01a1i Transistor \u201cCh\u1ed1ng l\u1ea1i c\u00e1i ch\u1ebft\u201d c\u1ee7a R\u01a1le<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-19897\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Where-the-Transistor-22Anti-Kills22-the-Relay.webp\" alt=\"Where the Transistor &quot;Anti-Kills&quot; the Relay\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Where-the-Transistor-22Anti-Kills22-the-Relay.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Where-the-Transistor-22Anti-Kills22-the-Relay-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Where-the-Transistor-22Anti-Kills22-the-Relay-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Where-the-Transistor-22Anti-Kills22-the-Relay-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Where-the-Transistor-22Anti-Kills22-the-Relay-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Where-the-Transistor-22Anti-Kills22-the-Relay-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Where-the-Transistor-22Anti-Kills22-the-Relay-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>V\u00ec v\u1eady, n\u1ebfu r\u01a1le t\u1ed1t nh\u01b0 v\u1eady, t\u1ea1i sao ch\u00fang ta kh\u00f4ng s\u1eed d\u1ee5ng ch\u00fang trong \u0111i\u1ec7n tho\u1ea1i ho\u1eb7c m\u00e1y t\u00ednh c\u1ee7a m\u00ecnh?<\/p>\n<p>B\u1edfi v\u00ec r\u01a1le c\u00f3 hai nh\u01b0\u1ee3c \u0111i\u1ec3m ch\u1ebft ng\u01b0\u1eddi: <strong>T\u1ed1c \u0111\u1ed9<\/strong> v\u00e0 <strong>Hao m\u00f2n<\/strong>.<\/p>\n<h3>Gi\u1edbi h\u1ea1n t\u1ed1c \u0111\u1ed9<\/h3>\n<p>R\u01a1le l\u00e0 m\u1ed9t c\u00e1nh tay c\u01a1 kh\u00ed di chuy\u1ec3n trong kh\u00f4ng gian.<\/p>\n<ul>\n<li><strong>T\u1ed1c \u0111\u1ed9 R\u01a1le:<\/strong> ~50 \u0111\u1ebfn 100 mili gi\u00e2y. T\u1ea7n s\u1ed1 chuy\u1ec3n m\u1ea1ch t\u1ed1i \u0111a: c\u00f3 th\u1ec3 10 l\u1ea7n m\u1ed7i gi\u00e2y (10 Hz).<\/li>\n<li><strong>T\u1ed1c \u0111\u1ed9 Transistor:<\/strong> Nano gi\u00e2y. T\u1ea7n s\u1ed1 chuy\u1ec3n m\u1ea1ch t\u1ed1i \u0111a: H\u00e0ng tri\u1ec7u l\u1ea7n m\u1ed7i gi\u00e2y (MHz).<\/li>\n<\/ul>\n<p>N\u1ebfu b\u1ea1n c\u1ea7n l\u00e0m m\u1edd \u0111\u00e8n LED b\u1eb1ng PWM (\u0110i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung), n\u01a1i b\u1ea1n b\u1eadt v\u00e0 t\u1eaft ngu\u1ed3n 1.000 l\u1ea7n m\u1ed9t gi\u00e2y, th\u00ec r\u01a1le v\u00f4 d\u1ee5ng. N\u00f3 s\u1ebd nghe nh\u01b0 m\u1ed9t kh\u1ea9u s\u00fang m\u00e1y trong kho\u1ea3ng 10 ph\u00fat tr\u01b0\u1edbc khi n\u00f3 tan r\u00e3.<\/p>\n<h3>S\u1ed1 l\u01b0\u1ee3ng t\u1eed vong<\/h3>\n<p>R\u01a1le c\u00f3 tu\u1ed5i th\u1ecd gi\u1edbi h\u1ea1n.<\/p>\n<ul>\n<li><strong>Cu\u1ed9c s\u1ed1ng c\u01a1 h\u1ecdc:<\/strong> M\u1ed7i khi n\u00f3 nh\u1ea5p, l\u00f2 xo b\u1ecb m\u1ecfi v\u00e0 tr\u1ee5c xoay b\u1ecb m\u00f2n. M\u1ed9t r\u01a1le t\u1ed1t c\u00f3 th\u1ec3 k\u00e9o d\u00e0i 1 tri\u1ec7u chu k\u1ef3.<\/li>\n<li><strong>Cu\u1ed9c s\u1ed1ng \u0111i\u1ec7n:<\/strong> M\u1ed7i khi n\u00f3 m\u1edf d\u01b0\u1edbi t\u1ea3i, m\u1ed9t h\u1ed3 quang nh\u1ecf s\u1ebd l\u00e0m r\u1ed7 c\u00e1c ti\u1ebfp \u0111i\u1ec3m. \u1ede t\u1ea3i \u0111\u1ea7y, n\u00f3 c\u00f3 th\u1ec3 ch\u1ec9 k\u00e9o d\u00e0i 100.000 chu k\u1ef3.<\/li>\n<\/ul>\n<p>MOSFET, n\u1ebfu \u0111\u01b0\u1ee3c gi\u1eef m\u00e1t v\u00e0 \u0111\u00fang th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt, c\u00f3 <strong>tu\u1ed5i th\u1ecd v\u1ec1 m\u1eb7t l\u00fd thuy\u1ebft l\u00e0 v\u00f4 h\u1ea1n<\/strong>. N\u00f3 kh\u00f4ng b\u1ecb hao m\u00f2n.<\/p>\n<h2>V\u00f9ng \u0111\u1ea5t trung gian: R\u01a1 le b\u00e1n d\u1eabn (SSR)<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-19898\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Middle-Ground-The-Solid-State-Relay-SSR.webp\" alt=\"The Middle Ground: The Solid State Relay (SSR)\" width=\"800\" height=\"800\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Middle-Ground-The-Solid-State-Relay-SSR.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Middle-Ground-The-Solid-State-Relay-SSR-300x300.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Middle-Ground-The-Solid-State-Relay-SSR-150x150.webp 150w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Middle-Ground-The-Solid-State-Relay-SSR-768x768.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Middle-Ground-The-Solid-State-Relay-SSR-12x12.webp 12w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Middle-Ground-The-Solid-State-Relay-SSR-600x600.webp 600w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/The-Middle-Ground-The-Solid-State-Relay-SSR-100x100.webp 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>\u201cNh\u01b0ng khoan \u0111\u00e3,\u201d b\u1ea1n n\u00f3i. \u201cC\u00f2n R\u01a1 le b\u00e1n d\u1eabn th\u00ec sao?\u201d<\/p>\n<p>SSR l\u00e0 m\u1ed9t \u201cthi\u1ebft b\u1ecb lai\u201d. N\u00f3 s\u1eed d\u1ee5ng m\u1ed9t \u0111\u00e8n LED b\u00ean trong \u0111\u1ec3 k\u00edch ho\u1ea1t m\u1ed9t ch\u1ea5t b\u00e1n d\u1eabn nh\u1ea1y s\u00e1ng.<\/p>\n<ul>\n<li><strong>N\u00f3 c\u00f3 c\u00e1ch ly:<\/strong> C\u00f3 (C\u00e1ch ly quang h\u1ecdc).<\/li>\n<li><strong>N\u00f3 c\u00f3 t\u1ed1c \u0111\u1ed9:<\/strong> C\u00f3 (Nhanh h\u01a1n c\u01a1 h\u1ecdc, ch\u1eadm h\u01a1n MOSFET tr\u1ea7n).<\/li>\n<li><strong>N\u00f3 c\u00f3 s\u1ef1 im l\u1eb7ng:<\/strong> \u0110\u00fang.<\/li>\n<\/ul>\n<p><strong>\u0110i\u1ec3m y\u1ebfu: Nhi\u1ec7t.<\/strong><br \/>M\u1ed9t r\u01a1 le c\u01a1 h\u1ecdc c\u00f3 \u0111i\u1ec7n tr\u1edf g\u1ea7n b\u1eb1ng kh\u00f4ng (miliohm). M\u1ed9t SSR c\u00f3 s\u1ee5t \u00e1p (th\u01b0\u1eddng l\u00e0 0,7V \u0111\u1ebfn 1,5V) tr\u00ean \u0111\u1ea7u ra c\u1ee7a n\u00f3.<br \/>\u0110\u1ea9y 10 Ampe qua m\u1ed9t r\u01a1 le c\u01a1 h\u1ecdc? N\u00f3 v\u1eabn m\u00e1t.<br \/>\u0110\u1ea9y 10 Ampe qua m\u1ed9t SSR? N\u00f3 t\u1ea1o ra <strong>15 Watts nhi\u1ec7t<\/strong>. B\u1ea1n c\u1ea7n m\u1ed9t b\u1ed9 t\u1ea3n nhi\u1ec7t l\u1edbn \u0111\u1ec3 gi\u1eef cho n\u00f3 kh\u00f4ng b\u1ecb n\u00f3ng ch\u1ea3y.<\/p>\n<h2>T\u00f3m t\u1eaft: Ma tr\u1eadn quy\u1ebft \u0111\u1ecbnh c\u1ee7a k\u1ef9 s\u01b0<\/h2>\n<p>V\u00ec v\u1eady, ti\u1ebfng \u201cl\u1ea1ch c\u1ea1ch\u201d v\u1ee5ng v\u1ec1 s\u1ebd kh\u00f4ng bi\u1ebfn m\u1ea5t. \u0110\u00f3 l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn k\u1ef9 thu\u1eadt c\u00f3 ch\u1ee7 \u00fd. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 t\u00e0i li\u1ec7u tham kh\u1ea3o nhanh c\u1ee7a b\u1ea1n v\u1ec1 th\u1eddi \u0111i\u1ec3m n\u00ean g\u1eafn b\u00f3 v\u1edbi c\u00f4ng ngh\u1ec7 c\u0169:<\/p>\n<table border=\"1\">\n<thead>\n<tr>\n<th>K\u1ecbch b\u1ea3n<\/th>\n<th><strong>S\u1eed d\u1ee5ng R\u01a1 le<\/strong><\/th>\n<th><strong>S\u1eed d\u1ee5ng Transistor\/MOSFET<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u01afu ti\u00ean an to\u00e0n<\/strong><\/td>\n<td><strong>CAO<\/strong> (C\u1ea7n c\u00e1ch ly \u0111i\u1ec7n)<\/td>\n<td><strong>TH\u1ea4P<\/strong> (Chung mass l\u00e0 OK)<\/td>\n<\/tr>\n<tr>\n<td><strong>Lo\u1ea1i T\u1ea3i<\/strong><\/td>\n<td><strong>AC ho\u1eb7c Kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/strong> (Ph\u1ed5 qu\u00e1t)<\/td>\n<td><strong>Ch\u1ec9 DC<\/strong> (T\u1ea3i \u0111\u00e3 bi\u1ebft)<\/td>\n<\/tr>\n<tr>\n<td><strong>T\u1ed1c \u0111\u1ed9 chuy\u1ec3n \u0111\u1ed5i<\/strong><\/td>\n<td><strong>Ch\u1eadm<\/strong> (B\u1eadt\/T\u1eaft kh\u00f4ng th\u01b0\u1eddng xuy\u00ean)<\/td>\n<td><strong>Nhanh<\/strong> (PWM \/ T\u1ea7n s\u1ed1 cao)<\/td>\n<\/tr>\n<tr>\n<td><strong>Tu\u1ed5i th\u1ecd c\u1ea7n thi\u1ebft<\/strong><\/td>\n<td><strong>H\u1eefu h\u1ea1n<\/strong> (&lt;100k chu k\u1ef3)<\/td>\n<td><strong>V\u00f4 h\u1ea1n<\/strong> (H\u00e0ng tri\u1ec7u chu k\u1ef3)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u00c2m thanh\/Ti\u1ebfng \u1ed3n<\/strong><\/td>\n<td><strong>Ti\u1ebfng click l\u00e0 OK<\/strong><\/td>\n<td><strong>Ph\u1ea3i im l\u1eb7ng<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Trong k\u1ef9 thu\u1eadt, \u201cM\u1edbi h\u01a1n\u201d kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng \u201cT\u1ed1t h\u01a1n\u201d. \u0110\u00f4i khi, gi\u1ea3i ph\u00e1p t\u1ed1t nh\u1ea5t v\u1eabn l\u00e0 m\u1ed9t cu\u1ed9n d\u00e2y \u0111\u1ed3ng, m\u1ed9t l\u00f2 xo th\u00e9p v\u00e0 m\u1ed9t \u00e2m thanh th\u1ecfa m\u00e3n <em>click<\/em>.<\/p>\n<hr \/>\n<h2>K\u1ef9 Thu\u1eadt Ch\u00ednh X\u00e1c Ch\u00fa \u00dd<\/h2>\n<p><strong>\u0110i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac:<\/strong> R\u01a1 le c\u01a1 \u0111i\u1ec7n th\u01b0\u1eddng c\u00f3 \u0111i\u1ec7n tr\u1edf ti\u1ebfp x\u00fac trong kho\u1ea3ng <strong>50m\u03a9 \u0111\u1ebfn 100m\u03a9<\/strong>, kh\u00f4ng \u0111\u00e1ng k\u1ec3 \u0111\u1ed1i v\u1edbi t\u1ed5n th\u1ea5t \u0111i\u1ec7n n\u0103ng nh\u01b0ng c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 \u0111\u1ed1i v\u1edbi c\u00e1c t\u00edn hi\u1ec7u \u0111i\u1ec7n \u00e1p r\u1ea5t th\u1ea5p (y\u00eau c\u1ea7u d\u00f2ng \u0111i\u1ec7n l\u00e0m \u01b0\u1edbt).<\/p>\n<p><strong>R\u00f2 r\u1ec9:<\/strong> Transistor\/SSR lu\u00f4n c\u00f3 m\u1ed9t d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 nh\u1ecf khi T\u1eaeT. R\u01a1 le c\u00f3 <strong>zero<\/strong> r\u00f2 r\u1ec9 (\u0111i\u1ec7n tr\u1edf v\u00f4 h\u1ea1n) khi m\u1edf.<\/p>\n<p><strong>K\u1ecbp th\u1eddi:<\/strong> C\u00e1c nguy\u00ean t\u1eafc chuy\u1ec3n m\u1ea1ch c\u01a1 \u0111i\u1ec7n so v\u1edbi tr\u1ea1ng th\u00e1i r\u1eafn l\u00e0 v\u1eadt l\u00fd c\u01a1 b\u1ea3n v\u00e0 v\u1eabn c\u00f2n hi\u1ec7u l\u1ef1c k\u1ec3 t\u1eeb th\u00e1ng 11 n\u0103m 2025.<\/p>\n<\/div>\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>You open up a modern, high-tech smart home controller. It\u2019s packed with microscopic surface-mount components, powerful microprocessors, and Wi-Fi chips. And then, sitting right in the middle of all that silicon, is a big, blocky, plastic cube. When it activates, it makes a loud CLICK. It\u2019s a mechanical relay. Technology from the 1830s. This begs [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":19899,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-19893","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/19893","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/comments?post=19893"}],"version-history":[{"count":2,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/19893\/revisions"}],"predecessor-version":[{"id":19901,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/19893\/revisions\/19901"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media\/19899"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media?parent=19893"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/categories?post=19893"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/tags?post=19893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}