Ponts de diodes fiables ?

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J'utilise des ponts de ce genre :
http://www.limpulsion.fr/art/KBPC3510/PONT_DE_DIODES_35A_1000V






On dirait que ces ponts "s'usent". Est-ce normal ? Y-a-t-il des marques  


Re: Ponts de diodes fiables ?

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Est-ce que ces 2 conditions sont remplies?
Le radiateur est suffisant (en taille)?

Re: Ponts de diodes fiables ?


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de la graisse silicone.






tout.

Re: Ponts de diodes fiables ?



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C'est ce que l'on apprenait pour les onduleurs, de devoir tenir compte


fortes harmoniques).

Maintenant, c'est vrai, on ne peut rien contre le fait de tomber sur une

Michel

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Exactement, lors d'un redressement en mono alternance classique (donc non



cyclique (blocage/conduction)*courant moyen.









Re: Ponts de diodes fiables ?

...






fonctionnement normal, et sans lien ni avec le temps d'utilisation ni  


donc soutirant un courant parfaitement constant.
La seule chose que je peux dire, c'est que :


fonctionnement.

pont.

Re: Ponts de diodes fiables ?
Le Sun, 01 Jul 2018 14:27:52 +0200,


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    voies). Ce n'est pas 35A _par diode_, mais 35A _pour les deux diodes




    migration en raison de la chaleur.

    JKB

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Re: Ponts de diodes fiables ?

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"Maximum Average Forward Rectified Output 35A" signifie que les 35A  












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Possible mais peu probable, il faudrait que je mesure, je ne suis pas  




temps d'utilisation, ce qui n'est pas le cas.

Re: Ponts de diodes fiables ?

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"Maximum Average Forward Rectified Output 35A" signifie que les 35A  












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Possible mais peu probable, il faudrait que je mesure, je ne suis pas  




temps d'utilisation, ce qui n'est pas le cas.

PS- possible aussi qu'il y ait plusieurs facteurs, et que la chaleur  



Re: Ponts de diodes fiables ?
Le Sun, 01 Jul 2018 15:11:27 +0200,


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    non 35. Tu noteras qu'ils indiquent 17,5A_dc_. C'est donc 35A/2



    ponts en H de commande de moteur).










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--  


=> http://grincheux.de-charybde-en-scylla.fr
=> http://loubardes.de-charybde-en-scylla.fr

Re: Ponts de diodes fiables ?

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Non. Dans le datasheet de la marque SYC, la courbe de courant est  

identiques.








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dans "xx".



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Arpparemment oui.

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Re: Ponts de diodes fiables ?
Le Sun, 01 Jul 2018 16:45:16 +0200,


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    35A _pour le pont_ parce que c'est un pont de diodes et non un






    thermique si le radiateur est mauvais.





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    Le courant admissible par le pont ou par une diode ? Si c'est par le
    pont, il faut diviser par deux.

    Pour info, le nombre de datasheets qui induisent les gens en erreur

    3A. Sauf qu'il y a deux ponts dans le composant (Allegro) et que les

    utilisation classique, on fait sortir 1,1A sur les deux ponts,

    deux ponts, donc 2*3A.











    JKB

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=> http://grincheux.de-charybde-en-scylla.fr
=> http://loubardes.de-charybde-en-scylla.fr

Re: Ponts de diodes fiables ?

...


Le seul "17,5A" dans le datasheet du KBPC3504, c'est :

"Maximum Forward Voltage Drop per element at 17.5A DC : Vf=1.1 v"



pourraient le fournir au tiers ou au trois quart.


"Maximum Average Forward Rectified Output Current at Tc = 55C : Io35%A"

35A.



http://www.sycelectronica.com.ar/semiconductores/KBPC3504-10.pdf

Tu es bien gentil, mais il faudra revoir ton anglais et la lecture des  
datasheets.

Re: Ponts de diodes fiables ?
Le Wed, 04 Jul 2018 19:32:19 +0200,


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    Avant de m'insulter, tu reliras le datasheet. Mais tu fais ce que tu


    de Vf au courant max. Et si ton truc fait passer 25A, donc 50A sur
    les deux diodes passantes, tu as un pont qui va dissiper plus de 60W
    (et je suis optimiste). Sur un simple radiateur sans ventilation

    suffisant pour claquer n'importe quel pont.

    Bref, mauvaise conception.


    entre les lignes.





    dans des conditions strictes.

    Fin de la discussion.

    JKB

--  


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A 17,5A, on perd 1,1 V dans la jonction (ce qui n'est d'ailleurs qu'une  
approximation ici puisque le courant n'est pas constant, on fait du  






courant dans chaque diode, raison pour laquelle, intelligemment, c'est  






:-)

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A 17,5A, on perd 1,1 V dans la jonction (ce qui n'est d'ailleurs qu'une  
approximation ici puisque le courant n'est pas constant, on fait du  






courant dans chaque diode, raison pour laquelle, intelligemment, c'est  






:-)



Re: Ponts de diodes fiables ?
On 01/07/18 17:31, JKB wrote:








trancher: l'oscillo !!!

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"So all that's left, Is the proof that love's not only blind but deaf."
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Re: Ponts de diodes fiables ?
Le Thu, 05 Jul 2018 15:18:54 +0200,

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    indique bien 35A (17,5Adc), ce qui m'a fait tiquer et analyser plus
    finement les courbes. J'ai la flemme de rechercher le document, je ne

    transitoire redresser plus, mais pas en continu.












    senties.


    IXYS DSSS30-01AR  
    30A, 100V, Vf=0,63V

    Il en faut deux pour faire un pont.




    d'aider.

    JKB

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Re: Ponts de diodes fiables ?

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jonction.

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20A, ce qui signifie 10A/jonction.
Donc non seulement on n'aurait pas les 77W de dissipation mais  





http://www.rigpix.com/psu/icom_icps15.htm





Ben voyons...
lol

Re: Ponts de diodes fiables ?
Le Sat, 30 Jun 2018 10:24:25 +0200,



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    Je proscris ce genre de pont redresseur sauf pour les faibles


    (c'est en revanche un peu plus cher). Pour des alimentations haute




    Si je comprends bien, le pont redresse 2*17,5A pour avoir 17,5A en


    en fonctionnement normal ?






    assez intense pour fatiguer la jonction.





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    des bivalves, pourquoi pas. Mais sur du semi-conducteur, la seule



    Le semi-conducteur ne craint pas les chocs, il n'aime pas la

    polluants.

    JKB

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