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Rudi82

Driver led inversare PWM

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Buna ziua!

 

Acuma am comandat din china :

https://www.aliexpress.com/item/33030179467.html?spm=a2g0o.productlist.0.0.6af26349wUHnZk&algo_pvid=039c2d79-f097-46f5-8b1e-53a12879f8e8&algo_expid=039c2d79-f097-46f5-8b1e-53a12879f8e8-34&btsid=4886c60c-5f0b-41bc-9cf1-d99cf2bbd602&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_53

 

The setting of the dimming port is 0~3v, 0v is the brightest, 2~2.5v is already very dark.

driver led care are semnalul pwm invers: adica la 0v=luminozitate maxima,3v=minim ,se poate cumva inversa ? 

 

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Se poate inversa semnalul de intrare, fara sa se umble la convertor, cu un LM358 alimentat de la minimum 5V.

@gsabac

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puteti posta o schema? asa chiar nu stiu ,ce sa caut.. 

multumesc .

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V-am realizat o schema functionala, dar eram sigur ca o concepeti dvs. ca de cautat pe net este imposibil de gasit o schema care sa corespunda cu parametrii ceruti la intrarea convertorului. Este buna si simularea, deoarece verifica si valideaza rezultatul, nu-i asa?

   1620303599_Inversorpentrubacklight.png.08c113af0de57134da2ead3fd3f8a0f5.png

Deoarece in display poate este nevoie de o ajustare fina, puteti pune in locul rezistentei R2 un trimer de 20K in serie cu o rezistenta de 33K.

Acum 2 ani am reparat convertorul de backlight de la un display Samsung de 27 inch, prin inlocuirea circuitului integrat care continea 2 tranzistori MOS canal P cu 2 tranzistori separati. Am construit un circuit cu zone de cupru marite pentru racire si l-am conectat cu fire pe conexiunile din circuitul imprimat.

Succes! 

@gsabac

Edited by gsabac
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multumesc mult 

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