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Pomocy - nie działa przetwornica do świetlówki - Forum Elektroniczne

Pomocy - nie działa przetwornica do świetlówki

Zadaj tu pytanie, jeśli nie wiesz w jaki sposób zrobić układ realizujący założone funkcje.
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bf214
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Pomocy - nie działa przetwornica do świetlówki

Postautor: bf214 » czw 10 mar 2005, 5:52

Cześć !
Mam problem z taką przetwornicą do świetlówki:

Obrazek

T1, T2 bc238
T3, T4 bd139
T5 2N3055
L1 - 20 zw. 0,5
L2 - 0,3 do wypełnienia karkasu
na rdzeniu F2001 średnica 25 mm
świetlówka 6W
zasilanie 5,5 - 14 V

No i to niestety nie chce świecić. Generator na T1 i T2 działa, połączenia są ok, wszystkie tranzystory sprawne podejrzewam T5, ale sprawdzałem
- złącza ma ok, h21e też mniej więcej przewidziane dla 2N3055.
Poradźta ! Zasilam to z baterii 6F22, może za słaba jest ? No ale to docelowo miałoby pobierać (wg opisu) 120 mA...

Gość
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Postautor: Gość » czw 10 mar 2005, 8:28

Proszę wyjąć T4 i zobaczyć czy zadziała?.
Jeśli tak to trzeba dobrać R w bazie T4.

Gość
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Postautor: Gość » czw 10 mar 2005, 9:20

Wydaje misie ze częstotliwość generatora ma być w rezonansie z cz. trafo+C, jak nie zestroisz to dupa. Zakładając ze układ wogle jest OK.
A dlaczego nie zrobisz tego na samodławnym

bf214
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Postautor: bf214 » czw 10 mar 2005, 18:46

Cześć !

Dzięki za odpowiedzi. A czy samodławny to taki na jednym tranzystorze
i z większą liczbą uzwojeń ? Jeśli tak, to one pobierają dużo większy
prąd, typowo 300 mA, a tutaj co prawda też, ale można ustawić na 120 mA i też jakoś świeci, dlatego zdecydowałem się na coś takiego.

PI
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przetwornica

Postautor: PI » sob 12 mar 2005, 0:15

Witam; proponuje zrobic najprostszy bilans mocy:aby zasilić świetlówke
6W, uwzględniając sprawnośc przetwornicy np. 0,9, to przekładając to na strone zasilania czyli 9V, potrzeba prądu ok 0,7A; zakładając, że nie będzie świeciła z pełna mocą to i tak jest tego ciągle dużo, jak na baterię 6F22. Zatem podczas eksperymentów proponuję sprawdzic napięcie na tej baterii, bo byc może ona zwyczajnie "nie wyrabia", co by było oczywiste. A układ jest w miarę poprawny, jakkolwiek ja bym wstawił między kolektor T2 a bazę T3 rezystor tak pi razy oko 820omów do 1K,
to by poprawiło pracę przerzutnika astabilnego (tak się historycznie ten układ nazywa). T5 też mógłby być troche nowocześniejszy, może nawet jakiś Darlington - to by się łatwiej sterowało.
PI

bf214
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Re: przetwornica

Postautor: bf214 » sob 12 mar 2005, 1:33


PI
[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1191: count(): Parameter must be an array or an object that implements Countable

przetw......

Postautor: PI » sob 12 mar 2005, 1:54


bf214
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Postautor: bf214 » sob 12 mar 2005, 3:51


Gość
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Postautor: Gość » ndz 13 mar 2005, 20:57



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