Comment rendre une LED vraiment Dimmable ?

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D'ou ma question comment je puis rendre une LED Dimmable pour info c'est  










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Re: Comment rendre une LED vraiment Dimmable ?
Le Mon, 10 Feb 2020 20:58:03 +0100,



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    Non. Une led, c'est un truc qui se commande en courant et non en
    tension. Pour les rendre "dimmable", il faut un engin qui fasse une
    commande en PWM ou qui limite le courant.

    JKB

--  


=> http://grincheux.de-charybde-en-scylla.fr
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Re: Comment rendre une LED vraiment Dimmable ?
JKB wrote:
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+1.


de la LED et de lui connecter *ton* driver (PWM *et* limitaition de  
courant).
En gros, un peu de fun en perspective !

Den

Re: Comment rendre une LED vraiment Dimmable ?


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confirme...

J'avais aussi lu il y a longtemps qu'il suffisait de souder une  



Merci a vous deux...


Re: Comment rendre une LED vraiment Dimmable ?

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thread

J'ai des Led qui fonctionnent sous 9 volts



resistance ou par l'alim


Pourquoi celles que je fais fonctionner ne claquent pas?

Re: Comment rendre une LED vraiment Dimmable ?


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mettre en mode foldback (limitation en courant et chute de la tension  




https://www.cjoint.com/doc/20_02/JBrtX7eEzVb_I-Constant.png


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H


Re: Comment rendre une LED vraiment Dimmable ?


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Re: Comment rendre une LED vraiment Dimmable ?


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On peut parfaitement connecter une led sur une alim de labo (sans  

courant.



l'augmenter.

Quand au fait que tes diodes ne calquent pas c'est que ton alim ne  

secret ;o)



ref de ta diode  ?
quelle Vf ; Quel If

Ton alimentation de labo ?
A t-elle une limitation de courant ?
Tenson de sortie max
courant de sortie max


Re: Comment rendre une LED vraiment Dimmable ?



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je ferai une petite video  mais en attendant

tension 0/40v




diodes en une

https://www.ebay.fr/itm/20PCS-10W-Pure-White-High-Power-1100LM-LED-Lamp-Chip-light-DC-9-12V-V9W2/333098793126?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649








Re: Comment rendre une LED vraiment Dimmable ?


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protection j'imagine

Re: Comment rendre une LED vraiment Dimmable ?




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Slt pb

Bon c'est beaucoup plus facile avec les data  ;o)

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diodes , aussi bien en tension, en courant donc en puissance, elle  

Par contre je ne sais pas si ton alim a une limitation de courant  



expliquerait que tes diodes ne claquent pas, mais bon, c'est une pure  


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350mA / 3,3V

Trois ensembles en // c'est If total 350 x 3 = 1050 mA  pour un VF de  
9.9V (constant)
Ce qui donne une puissance de 9.9V x 1.05A = 10.4 WW

aliexpress.


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du COB. vu la  composition du COB il faudra multiplier les valeurs par  
un facteur 3
https://www.cjoint.com/c/JBsxfPtitTJ








consomme alors qu'environ 250mA donc 2.25W (bien en dessous des 10W  
qu'il peut dissiper )



Fort delta I, qui sans limitation de courant se traduira par une  
destruction du COB





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qu'il te faut avec ton alim 40 V 3A .

Pour ton projet il te faut te poser plusieurs questions.

LED COB ----> OK








application, mais c'est pour du 230 V et en commande de phase avec un  



Chab

Re: Comment rendre une LED vraiment Dimmable ?





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B0505 IKEA il semble ne plus figurer dans le catalogue, pourtant en  
rayon il y a quelques temps...

aucun truc en dessous


Re: Comment rendre une LED vraiment Dimmable ?





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C'est donc un strob et je pense l'alimenter sous 12 volts avec donc une  
limitation en courant



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Re: Comment rendre une LED vraiment Dimmable ?

CUT ..




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Pour dimmer ta led le mieux est d'utiliser une modulation PWM,






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De rien, avec plaisir


Re: Comment rendre une LED vraiment Dimmable ?

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de coupelles dont le fond est enduit s'une peinture reflechissante  










diodes. Je vous le soumettrai car la temporisation ne me convient pas
Merci
B

Re: Comment rendre une LED vraiment Dimmable ?



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standard voire pire en mode Foldback ?



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imposer un courant.
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En effet.
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Re: Comment rendre une LED vraiment Dimmable ?



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compatible dimmable, sinon cela donnera un fonctionnement erratique.




secteur...


--  
pas de turlututu. apres l'@robase

Re: Comment rendre une LED vraiment Dimmable ?



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Hello,





remplacer des CFL fluo) et si je me le rappelle bien, la plus grande  

tension dangereuse ! (mauvais souvenir au moment des manips hasardeuses  
... )





crois l'avoir lu quelque part pendant le dev du machin ... Bon en s'en  



H.

Re: Comment rendre une LED vraiment Dimmable ?



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Merci a tous ceux qui alimentent ce fil...

Pour info je veux bien bricoler la lampe, c'est une lampe IKEA qui  




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