{"id":9427,"date":"2023-07-04T15:37:24","date_gmt":"2023-07-04T07:37:24","guid":{"rendered":"https:\/\/boqiled.com\/?p=9427"},"modified":"2025-11-29T17:59:56","modified_gmt":"2025-11-29T09:59:56","slug":"exploring-pwm-dimming-in-led-drivers-a-comprehensive-guide","status":"publish","type":"post","link":"https:\/\/boqiled.com\/vi\/exploring-pwm-dimming-in-led-drivers-a-comprehensive-guide\/","title":{"rendered":"Kh\u00e1m ph\u00e1 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM trong b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n"},"content":{"rendered":"
\"PWM<\/figure>\n\n\n\n

Ch\u00e0o m\u1eebng b\u1ea1n \u0111\u1ebfn v\u1edbi h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng LED. N\u1ebfu b\u1ea1n t\u1eebng ng\u1ea1c nhi\u00ean tr\u01b0\u1edbc \u00e1nh s\u00e1ng d\u1ecbu nh\u1eb9 c\u1ee7a \u0111\u00e8n LED \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng v\u00e0 t\u1ef1 h\u1ecfi l\u00e0m th\u1ebf n\u00e0o \u0111i\u1ec1u \u0111\u00f3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n, b\u1ea1n \u0111\u00e3 \u0111\u1ebfn \u0111\u00fang n\u01a1i!<\/p>\n\n\n\n

Gi\u1edbi thi\u1ec7u v\u1ec1 \u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng LED<\/h2>\n\n\n\n

\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng LED l\u00e0 t\u1ea5t c\u1ea3 v\u1ec1 vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n \u0111\u1ea7u ra c\u1ee7a m\u1ed9t thi\u1ebft b\u1ecb chi\u1ebfu s\u00e1ng. Kh\u00f4ng ch\u1ec9 t\u1ea1o ra b\u1ea7u kh\u00f4ng kh\u00ed ho\u00e0n h\u1ea3o; \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng c\u00f2n \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 gi\u1ea3m chi ph\u00ed. Th\u00fa v\u1ecb ph\u1ea3i kh\u00f4ng? H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n!<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

Ch\u1ee9c n\u0103ng k\u00e9p c\u1ee7a B\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED<\/h2>\n\n\n\n

B\u1ea1n c\u00f3 th\u1ec3 \u0111ang th\u1eafc m\u1eafc, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED c\u00f3 li\u00ean quan g\u00ec \u0111\u1ebfn t\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec1u n\u00e0y? Ch\u00fang \u0111\u00f3ng vai tr\u00f2 k\u00e9p. \u0110\u1ea7u ti\u00ean, ch\u00fang ho\u1ea1t \u0111\u1ed9ng nh\u01b0 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i ngu\u1ed3n, chuy\u1ec3n \u0111\u1ed5i \u0111\u1ea7u v\u00e0o t\u1eeb ngu\u1ed3n \u0111i\u1ec7n ch\u00ednh th\u00e0nh \u0111\u1ea7u ra th\u1ea5p ph\u00f9 h\u1ee3p cho \u0111\u00e8n LED.<\/p>\n\n\n\n

\n
\n
\"PWM<\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n

B\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED nh\u01b0 m\u1ed9t B\u1ed9 chuy\u1ec3n \u0111\u1ed5i ngu\u1ed3n<\/h3>\n\n\n\n

L\u00e0 b\u1ed9 chuy\u1ec3n \u0111\u1ed5i ngu\u1ed3n, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111\u00e8n LED nh\u1eadn \u0111\u00fang l\u01b0\u1ee3ng n\u0103ng l\u01b0\u1ee3ng. Qu\u00e1 \u00edt, ch\u00fang s\u1ebd kh\u00f4ng s\u00e1ng r\u1ef1c; qu\u00e1 nhi\u1ec1u, ch\u00fang c\u00f3 th\u1ec3 b\u1ecb ch\u00e1y.<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

B\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED nh\u01b0 m\u1ed9t B\u1ed9 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng<\/h3>\n\n\n\n

Th\u1ee9 hai, B\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED<\/a> ho\u1ea1t \u0111\u1ed9ng nh\u01b0 b\u1ed9 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng<\/a>, ki\u1ec3m so\u00e1t l\u01b0\u1ee3ng n\u0103ng l\u01b0\u1ee3ng \u0111i v\u00e0o \u0111\u00e8n LED. Kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh n\u0103ng l\u01b0\u1ee3ng n\u00e0y l\u00e0m cho b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED tr\u1edf n\u00ean quan tr\u1ecdng trong vi\u1ec7c ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 gi\u1ea3m chi ph\u00ed \u0111i\u1ec7n. Ch\u00fang gi\u1ed1ng nh\u01b0 ng\u01b0\u1eddi ch\u1ec9 huy d\u00e0n nh\u1ea1c, \u0111i\u1ec1u h\u01b0\u1edbng d\u00f2ng n\u0103ng l\u01b0\u1ee3ng \u0111\u1ec3 t\u1ea1o ra m\u1ed9t c\u0103n ph\u00f2ng \u0111\u01b0\u1ee3c chi\u1ebfu s\u00e1ng ho\u00e0n h\u1ea3o!<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

Hai ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng ch\u00ednh: CCR v\u00e0 PWM<\/h2>\n\n\n\n

\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng \u0111\u00e8n LED kh\u00f4ng ph\u1ea3i l\u00e0 tr\u00f2 ch\u01a1i tr\u1ebb con. C\u00f3 hai c\u00e1ch ch\u00ednh \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED, Gi\u1ea3m d\u00f2ng \u0111i\u1ec7n kh\u00f4ng \u0111\u1ed5i (CCR) v\u00e0 \u0110i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung (PWM). C\u1ea3 hai ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec1u c\u00f3 \u0111i\u1ec3m m\u1ea1nh v\u00e0 \u1ee9ng d\u1ee5ng ri\u00eang, v\u00e0 s\u1ef1 l\u1ef1a ch\u1ecdn gi\u1eefa ch\u00fang th\u01b0\u1eddng ph\u1ee5 thu\u1ed9c v\u00e0o ho\u00e0n c\u1ea3nh c\u1ee5 th\u1ec3.<\/p>\n\n\n\n

\"PWM
\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng LED<\/figcaption><\/figure>\n\n\n\n

 T\u00ecm hi\u1ec3u s\u00e2u v\u1ec1 Gi\u1ea3m d\u00f2ng \u0111i\u1ec7n kh\u00f4ng \u0111\u1ed5i (CCR)<\/h2>\n\n\n\n

H\u00e3y t\u1ea1m d\u1eebng v\u00e0 xem x\u00e9t k\u1ef9 h\u01a1n ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ea7u ti\u00ean, CCR. N\u00f3 c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng t\u01b0\u01a1ng t\u1ef1. \u00dd t\u01b0\u1edfng ch\u00ednh \u0111\u1eb1ng sau CCR kh\u00e1 \u0111\u01a1n gi\u1ea3n: n\u1ebfu b\u1ea1n gi\u1ea3m d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua \u0111\u00e8n LED, b\u1ea1n gi\u1ea3m \u0111\u1ea7u ra c\u1ee7a n\u00f3, v\u00e0 th\u1ebf l\u00e0 b\u1ea1n c\u00f3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng!<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

\u01afu v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a CCR<\/h3>\n\n\n\n

CCR th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng trong c\u00e1c t\u00ecnh hu\u1ed1ng m\u00e0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u1edf xa ngu\u1ed3n \u0111i\u1ec7n, \u1edf khu v\u1ef1c \u1ea9m \u01b0\u1edbt v\u00e0 \u1ee9ng d\u1ee5ng ngo\u00e0i tr\u1eddi. \u0110\u00e2y c\u0169ng l\u00e0 l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u \u1edf nh\u1eefng n\u01a1i c\u00f3 ti\u00eau chu\u1ea9n nghi\u00eam ng\u1eb7t v\u1ec1 nhi\u1ec5u \u0111i\u1ec7n t\u1eeb (EMI). Tuy nhi\u00ean, nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p n\u00e0y l\u00e0 \u0111\u1ed9 trung th\u1ef1c m\u00e0u s\u1eafc c\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng khi \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng \u0111\u00e8n LED tr\u1eafng \u0111\u1ed9 s\u00e1ng cao ho\u1eb7c \u0111\u01a1n s\u1eafc.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Hi\u1ec3u chi ti\u1ebft v\u1ec1 \u0110i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung (PWM)<\/h2>\n\n\n\n

Ti\u1ebfp theo l\u00e0 PWM. Kh\u00e1c v\u1edbi CCR gi\u1ea3m d\u00f2ng \u0111i\u1ec7n, PWM \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng b\u1eb1ng c\u00e1ch chuy\u1ec3n \u0111\u1ed5i nhanh d\u00f2ng \u0111i\u1ec7n gi\u1eefa tr\u1ea1ng th\u00e1i b\u1eadt v\u00e0 t\u1eaft. Ngu\u1ed3n \u0111i\u1ec7n ch\u00ednh cung c\u1ea5p cho \u0111\u00e8n LED kh\u00f4ng thay \u0111\u1ed5i; thay v\u00e0o \u0111\u00f3, chu k\u1ef3 nhi\u1ec7m v\u1ee5 c\u1ee7a d\u00f2ng \u0111i\u1ec7n thay \u0111\u1ed5i. \u0110\u00f3 l\u00e0 k\u1ef9 thu\u1eadt \u0111i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung trong m\u1ed9t c\u00e2u.<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

 \u01afu v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a PWM<\/h3>\n\n\n\n

PWM c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i, t\u1eeb \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED, t\u1ea5m pin m\u1eb7t tr\u1eddi \u0111\u1ebfn \u0111\u1ed9ng c\u01a1. \u01afu \u0111i\u1ec3m \u0111\u00e1ng k\u1ec3 c\u1ee7a PWM l\u00e0 duy tr\u00ec \u0111\u1ed9 trung th\u1ef1c m\u00e0u s\u1eafc trong to\u00e0n b\u1ed9 ph\u1ea1m vi \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng. Tuy nhi\u00ean, nh\u01b0\u1ee3c \u0111i\u1ec3m l\u00e0 n\u00f3 c\u00f3 th\u1ec3 t\u1ea1o ra nhi\u1ec1u EMI h\u01a1n so v\u1edbi \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng t\u01b0\u01a1ng t\u1ef1, v\u00ec v\u1eady c\u1ea7n thi\u1ebft k\u1ebf v\u00e0 ki\u1ec3m tra c\u1ea9n th\u1eadn \u0111\u1ec3 tu\u00e2n th\u1ee7 EMI.<\/p>\n\n\n\n

\u0110i s\u00e2u v\u00e0o \u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM<\/h2>\n\n\n\n

Sau khi hi\u1ec3u nh\u1eefng \u0111i\u1ec1u c\u01a1 b\u1ea3n, h\u00e3y ti\u1ebfn xa h\u01a1n v\u00e0o s\u1ef1 ph\u1ee9c t\u1ea1p c\u1ee7a \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM. \u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM l\u00e0 t\u1ea5t c\u1ea3 v\u1ec1 vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh d\u00f2ng \u0111i\u1ec7n trong b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED b\u1eb1ng c\u01a1 ch\u1ebf PWM. Do \u0111\u00f3, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED tr\u1edf n\u00ean c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng, mang l\u1ea1i s\u1ef1 linh ho\u1ea1t v\u00e0 kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng trong thi\u1ebft k\u1ebf chi\u1ebfu s\u00e1ng.<\/p>\n\n\n\n

PWM chuy\u1ec3n \u0111\u1ed5i d\u00f2ng \u0111i\u1ec7n \u1edf t\u1ea7n s\u1ed1 cao, dao \u0111\u1ed9ng t\u1eeb 0 \u0111\u1ebfn \u0111\u1ea7u ra t\u1ed1i \u0111a, ho\u1eb7c d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra t\u1ef7 l\u1ec7 th\u1eddi gian b\u1eadt so v\u1edbi th\u1eddi gian t\u1eaft, ki\u1ec3m so\u00e1t \u0111\u1ed9 s\u00e1ng LED.<\/p>\n\n\n\n

\u0110i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung nh\u01b0 m\u1ed9t t\u00edn hi\u1ec7u \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng<\/h2>\n\n\n\n

H\u00e3y ngh\u0129 v\u1ec1 t\u00edn hi\u1ec7u \u0111i\u1ec1u ch\u1ebf \u0111\u1ed9 r\u1ed9ng xung nh\u01b0 c\u00e1c chu\u1ed7i xung, t\u1ea1o th\u00e0nh m\u1ed9t chu\u1ed7i s\u00f3ng vu\u00f4ng \u0111\u1eb9p m\u1eaft. M\u1ed7i t\u00edn hi\u1ec7u bao g\u1ed3m m\u1ed9t \u0111i\u1ec3m cao v\u00e0 m\u1ed9t \u0111i\u1ec3m th\u1ea5p. Th\u1eddi gian t\u00edn hi\u1ec7u duy tr\u00ec \u1edf m\u1ee9c cao l\u00e0 \u2018th\u1eddi gian b\u1eadt,\u2019 trong khi th\u1eddi gian duy tr\u00ec \u1edf m\u1ee9c th\u1ea5p l\u00e0 \u2018th\u1eddi gian t\u1eaft.\u2019<\/p>\n\n\n\n

T\u1ea7m quan tr\u1ecdng c\u1ee7a Chu k\u1ef3 nhi\u1ec7m v\u1ee5 trong PWM<\/h2>\n\n\n\n

Chu k\u1ef3 nhi\u1ec7m v\u1ee5 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 s\u00e1ng LED nh\u01b0 th\u1ebf n\u00e0o<\/h3>\n\n\n\n

Trong th\u1ebf gi\u1edbi PWM, th\u01b0\u1edbc \u0111o th\u1eddi gian t\u00edn hi\u1ec7u duy tr\u00ec \u1edf m\u1ee9c cao \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 chu k\u1ef3 nhi\u1ec7m v\u1ee5. V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t t\u00edn hi\u1ec7u li\u00ean t\u1ee5c b\u1eadt, \u0111\u00f3 l\u00e0 chu k\u1ef3 nhi\u1ec7m v\u1ee5 100%. B\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t th\u1eddi gian b\u1eadt c\u1ee7a t\u00edn hi\u1ec7u PWM. Gi\u1ea3 s\u1eed, n\u1ebfu chu k\u1ef3 nhi\u1ec7m v\u1ee5 PWM \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf 50%, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 t\u00edn hi\u1ec7u ho\u1ea1t \u0111\u1ed9ng 50% th\u1eddi gian b\u1eadt v\u00e0 50% th\u1eddi gian t\u1eaft. \u0110i\u1ec1u quan tr\u1ecdng c\u1ea7n l\u01b0u \u00fd l\u00e0 chu k\u1ef3 nhi\u1ec7m v\u1ee5 c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u1eeb 0% \u0111\u1ebfn 100%.<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

\u0110\u00e2y l\u00e0 h\u00ecnh \u1ea3nh \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

Vai tr\u00f2 c\u1ee7a T\u1ea7n s\u1ed1 trong t\u00edn hi\u1ec7u PWM<\/h2>\n\n\n\n

T\u1ea7n s\u1ed1 v\u00e0 Chu k\u1ef3 nhi\u1ec7m v\u1ee5 t\u01b0\u01a1ng t\u00e1c nh\u01b0 th\u1ebf n\u00e0o<\/h3>\n\n\n\n

M\u1ed9t kh\u00eda c\u1ea1nh quan tr\u1ecdng kh\u00e1c c\u1ee7a t\u00edn hi\u1ec7u PWM l\u00e0 t\u1ea7n s\u1ed1 c\u1ee7a n\u00f3. T\u1ea7n s\u1ed1 quy\u1ebft \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 t\u00edn hi\u1ec7u PWM ho\u00e0n th\u00e0nh m\u1ed9t chu k\u1ef3, trong \u0111\u00f3 m\u1ed9t chu k\u1ef3 l\u00e0 t\u1ed5ng th\u1eddi gian \u0111\u1ec3 t\u00edn hi\u1ec7u b\u1eadt v\u00e0 t\u1eaft. C\u00e2n b\u1eb1ng chu k\u1ef3 nhi\u1ec7m v\u1ee5 v\u00e0 t\u1ea7n s\u1ed1 c\u1ee7a t\u00edn hi\u1ec7u PWM cho ph\u00e9p b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng.<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

PWM nh\u01b0 \u0110\u1ea7u ra c\u1ee7a B\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED<\/h2>\n\n\n\n

T\u1eeb T\u00edn hi\u1ec7u PWM \u0111\u1ebfn Ki\u1ec3m so\u00e1t \u0110\u1ed9 s\u00e1ng LED<\/h3>\n\n\n\n

Khi t\u00edn hi\u1ec7u PWM \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh \u0111i\u1ec7n \u00e1p DC, n\u00f3 t\u1ea1o ra \u0111\u1ea7u ra b\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED PWM. M\u1ea1ch n\u00e0y c\u1eaft d\u00f2ng \u0111i\u1ec7n LED DC \u1edf t\u1ea7n s\u1ed1 cao gi\u1eefa tr\u1ea1ng th\u00e1i b\u1eadt v\u00e0 t\u1eaft. \u0110i\u1ec1u th\u00fa v\u1ecb l\u00e0 m\u1eaft ng\u01b0\u1eddi kh\u00f4ng th\u1ec3 nh\u1eadn th\u1ea5y hi\u1ec7n t\u01b0\u1ee3ng nh\u1ea5p nh\u00e1y t\u1ea7n s\u1ed1 cao n\u00e0y, d\u1eabn \u0111\u1ebfn s\u1ef1 thay \u0111\u1ed5i \u0111\u1ea7u ra \u00e1nh s\u00e1ng LED.<\/p>\n\n\n\n

\"PWM<\/figure>\n\n\n\n

K\u1ebft lu\u1eadn: T\u1ea7m quan tr\u1ecdng c\u1ee7a vi\u1ec7c Hi\u1ec3u \u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM trong B\u1ed9 \u0111i\u1ec1u khi\u1ec3n LED<\/h2>\n\n\n\n

Trong th\u1ebf gi\u1edbi c\u00f4ng ngh\u1ec7 chi\u1ebfu s\u00e1ng kh\u00f4ng ng\u1eebng ph\u00e1t tri\u1ec3n, vi\u1ec7c hi\u1ec3u \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM l\u00e0 r\u1ea5t quan tr\u1ecdng. Kh\u00f4ng ch\u1ec9 gi\u00fap ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng, m\u00e0 c\u00f2n t\u0103ng c\u01b0\u1eddng \u0111\u00e1ng k\u1ec3 s\u1ef1 linh ho\u1ea1t trong thi\u1ebft k\u1ebf chi\u1ebfu s\u00e1ng. B\u1eb1ng c\u00e1ch t\u1eadn d\u1ee5ng \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM, ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c b\u1ea7u kh\u00f4ng kh\u00ed chi\u1ebfu s\u00e1ng \u0111a d\u1ea1ng trong khi \u0111\u1ea3m b\u1ea3o hi\u1ec7u qu\u1ea3 n\u0103ng l\u01b0\u1ee3ng.<\/p>\n\n\n\n

B\u00e2y gi\u1edd b\u1ea1n \u0111\u00e3 \u0111\u01b0\u1ee3c trang b\u1ecb ki\u1ebfn th\u1ee9c n\u00e0y, b\u1ea1n \u0111\u00e3 s\u1eb5n s\u00e0ng b\u1eaft \u0111\u1ea7u h\u00e0nh tr\u00ecnh c\u1ee7a m\u00ecnh trong th\u1ebf gi\u1edbi chi\u1ebfu s\u00e1ng LED. Lu\u00f4n nh\u1edb r\u1eb1ng, m\u1ed7i \u00e1nh \u0111\u00e8n \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng kh\u00f4ng ch\u1ec9 g\u00f3p ph\u1ea7n ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng m\u00e0 c\u00f2n m\u1edf \u0111\u01b0\u1eddng cho m\u1ed9t t\u01b0\u01a1ng lai b\u1ec1n v\u1eefng.<\/p>\n\n\n\n

\"PWM<\/a><\/figure>\n\n\n\n

C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h3>\n\n\n\n
\n
\n
<\/span><\/span>

S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng CCR v\u00e0 PWM l\u00e0 g\u00ec?<\/h4><\/div>

\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng CCR ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch gi\u1ea3m d\u00f2ng \u0111i\u1ec7n, trong khi \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch chuy\u1ec3n \u0111\u1ed5i nhanh d\u00f2ng \u0111i\u1ec7n b\u1eadt v\u00e0 t\u1eaft.<\/p><\/div><\/div>

<\/span><\/span>

Ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng n\u00e0o duy tr\u00ec \u0111\u1ed9 trung th\u1ef1c m\u00e0u s\u1eafc?<\/h4><\/div>

PWM duy tr\u00ec \u0111\u1ed9 trung th\u1ef1c m\u00e0u s\u1eafc trong to\u00e0n b\u1ed9 ph\u1ea1m vi \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t l\u1ee3i th\u1ebf \u0111\u00e1ng k\u1ec3 trong m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng.<\/p><\/div><\/div>

<\/span><\/span>

Chu k\u1ef3 nhi\u1ec7m v\u1ee5 trong PWM l\u00e0 g\u00ec?<\/h4><\/div>

Trong PWM, chu k\u1ef3 nhi\u1ec7m v\u1ee5 l\u00e0 th\u01b0\u1edbc \u0111o th\u1eddi gian t\u00edn hi\u1ec7u duy tr\u00ec \u1edf m\u1ee9c cao ho\u1eb7c \u2018b\u1eadt\u2019.\u2019<\/p><\/div><\/div>

<\/span><\/span>

T\u1ea7n s\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM nh\u01b0 th\u1ebf n\u00e0o?<\/h4><\/div>

The frequency determines how fast the PWM signal completes a cycle. Balancing the duty cycle and frequency of the PWM signal enables a dimmable LED driver.<\/p><\/div><\/div>

<\/span><\/span>

M\u1eaft ng\u01b0\u1eddi c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n hi\u1ec7n t\u01b0\u1ee3ng nh\u1ea5p nh\u00e1y trong \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 s\u00e1ng PWM kh\u00f4ng?<\/h4><\/div>

No, the human eye cannot notice the high-frequency flickering in PWM dimming, resulting in a smooth change of the LED light output.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Welcome to our comprehensive guide to LED dimming. If you’ve ever marveled at the soft glow of dimmed LED lights and wondered how it’s done, you’re in the right place! Introduction to LED Dimming LED dimming is all about manipulating the output of a lighting fixture. It\u2019s not only about creating the perfect ambiance; dimming […]<\/p>\n","protected":false},"author":1,"featured_media":9432,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"PWM LED Dimming Explained: Methods, Benefits, and Applications","_seopress_titles_desc":"Explore the intricacies of PWM dimming in LEDs. Understand its significance in energy conservation and flexible lighting design.","_seopress_robots_index":"","footnotes":""},"categories":[20],"tags":[],"class_list":{"0":"post-9427","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-technical-guide"},"_links":{"self":[{"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/posts\/9427","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/comments?post=9427"}],"version-history":[{"count":0,"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/posts\/9427\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/media\/9432"}],"wp:attachment":[{"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/media?parent=9427"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/categories?post=9427"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boqiled.com\/vi\/wp-json\/wp\/v2\/tags?post=9427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}