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Przetwornica na UC3843 - Forum Elektroniczne

Przetwornica na UC3843

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mati1904
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Przetwornica na UC3843

Postautor: mati1904 » sob 30 lis 2013, 17:46

Witam
Chciałbym zbudować sobie zasilacz na przetwornicy z głównym układem UC3843 posiadam takie trafo:



Czy mogę je wykorzystać do pracy z tym układem wg. tego schematu:

Trafo pochodzi z zasilacza komputerowego DTK PTP-1508.

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Re: Przetwornica na UC3843

Postautor: rallus » sob 30 lis 2013, 21:14

Mógłbyś po spełnieniu pewnych warunków.
Musiałbyś znać parametry rdzenie w tym transformatorze.
Gdyby udało ci się go rozebrać bez uszkodzenia go.
Potem musiałbyś dokonać obliczeń z uwzględnieniem parametrów rdzenia.
Następnie nawinąć transformator według tych obliczeń.
Bezpośrednio nie możesz zastosować tego transformatora.

mati1904
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Re: Przetwornica na UC3843

Postautor: mati1904 » sob 30 lis 2013, 22:48

Dzięki kolego za odpowiedź.
Mam jeszcze trafo bardzo podobne na rdzeniu EI-33 ale pewnie to niewiele zmienia bo i tak nie wiem co tam jest nawiniete. Przestudiowałem schemat tego zasilacza (DTK PTP-1508) z którego pochodzi to trafo i tam jest właśnie ten układ UC3843AM czy to coś zmienia jeżeli to trafo pracowało pod kontrolą tego układu ?
Załączniki
DTK Computer model PTP-1508.pdf
Dołaczam schemat zasilacza z tym układem.
(260.45 KiB) Pobrany 927 razy

rallus
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Re: Przetwornica na UC3843

Postautor: rallus » ndz 01 gru 2013, 21:38

To że przetwornice pracują pod kontrolą tego samego układu scalonego nic nie zmienia.
Każda z nich jest inna. Wystarczy popatrzeć na schemat.
Inną wartość ma napięcie zasilania, być może inna częstotliwość pracy.
Niestety przetwornice impulsowe to wyższa szkoła jazdy.

mati1904
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Re: Przetwornica na UC3843

Postautor: mati1904 » ndz 01 gru 2013, 22:04

No nic tak też myślałem.
Mam też drugi zasilacz dokładnie DEER DR-B400ATX, ale jest z nim problem ponieważ kilka sekund po włączeniu go poprzez zwarcie zielonego z czarnym zasilacz przestaje pracować bez względu na to czy jest obciążony czy nie. Jedyne co zauważyłem to to że napiecie pozostaje na lini +5V SB czyli na tym na którym jest napiecie zaraz po podłączeniu do sieci. Co może być przyczyną ?
Nie chciałem już zakładać nowego tematu.


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