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Prosty stabilizator +24V powyżej 1A? - Forum Elektroniczne

Prosty stabilizator +24V powyżej 1A?

Zadaj tu pytanie, jeśli nie wiesz w jaki sposób zrobić układ realizujący założone funkcje.
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Bronek_84
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Prosty stabilizator +24V powyżej 1A?

Postautor: Bronek_84 » ndz 13 mar 2005, 17:04

Witam!
Mam mały problem. Odnośnie robię pracę dyplomową z wykorzystaniem Sterownika PLC i czujników zbliżeniowych. Zrobiłem zasilacz 24V z transformatora TS 40/018 (2x12V 1.65A poł w szeregu). Zastosowałem zwykły mostek, kondensator filtrujący 2200uf i na wyjściu jest przeszło 37V.

Nie jest to przuczyną kondensatora bo bez niego też tyle jest. Widocznie trafo ma troszkę wyższe napięcie niż podano w oznaczeniu.

Sterownik i czujniki są do 24V DC więc myślałem że zrobię prosty stabilizator z "7824" lecz jest on do 1A i nie wiem czy taka moc wystarczy do 2 czujników zbliż. (działają do 6mm) i PLC z wyświetlaczem Moeller.

Zastosować 7824 z dużym radiatorem czy jakiś inny stabilizator?
I to by było na tyle ;-)

rallus
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Postautor: rallus » ndz 13 mar 2005, 18:17

Dziwne Ci wyszły napięcia. Przy napięciu wtórnym 24 volty bez kondensatora powinno być ok. 22V. Napięcia katalogowe podawane są przy obciążeniu prądem znamionowy, na biegu jałowym będą zawsze wyższe.A z tego trafo i tak nie wyciągniesz więcej niż 1,4 A. Nie wiem ile pobiera sterownik ale czujniki zbliżeniowe pobierają ok. kilkanaście mA i wydaje mi się, że taki zasilacz powinien wystarczyć. Jak chcesz więcej prądu to dobuduj do stabilizatora dodatkowy tranzystor lub zastosuj inny stabilizator np. LM 350 (regulowane napięcie , prąd 3A) lub impulsowy LM 2576.

Bronek_84
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Postautor: Bronek_84 » ndz 13 mar 2005, 18:22

I to by było na tyle ;-)

MarekM
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Postautor: MarekM » ndz 13 mar 2005, 19:29

marecki

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Postautor: rallus » ndz 13 mar 2005, 20:59


Bronek_84
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Postautor: Bronek_84 » ndz 13 mar 2005, 22:38

I to by było na tyle ;-)


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