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Stabilizator kompensujacy. - Forum Elektroniczne

Stabilizator kompensujacy.

Zadaj tu pytanie, jeśli nie wiesz w jaki sposób zrobić układ realizujący założone funkcje.
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Gość
[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

Stabilizator kompensujacy.

Postautor: Gość » pn 24 paź 2005, 11:36

Witam.
Mam o to taki problem. POtrzebny mi jest schemat stabilizatora kompensujacego napiecie od 0 do 37V. Powinien on miec rowniez zabezpieczenie pradowe nie przekraczajace 2mA. Jezeli ktos ma jakies pomysly jak takie cos uzyskac bylbym bardzo wdzieczny. Pozdrawiam.

^Target
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więcej info ....

Postautor: ^Target » wt 25 paź 2005, 20:46


Gość
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Postautor: Gość » czw 03 lis 2005, 15:38

Tak zgadza sie, chodzilo o 2A. A potrafilbys cos takiego na bipolarnych zlozyc???

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zależy

Postautor: ^Target » czw 03 lis 2005, 20:33

mówiąc " na bipolarach" miałeś na myśli samą końcówkę mocy, czy cały układ. Rzucę zatem toporniejszy przykład (tylko elementy dyskretne). Oczywiście jest to tylko idea, dobór konkretnych elementów mysi być dokonany pod kątem danych parametrów. Schemat jest uproszczony do granic możliwości, dlatego nie należy się spodziewać rewelacyjnych właściwości. Pewnym archaizmem jest stosowanie podwójnych diod jako napięć odniesienia. Zamiast tego radziłbym zastosować scalony stabilizator na 1.25V np LM385-1.2. Zastosowanie układu TL431 w miejsce tranzystora T5 (usuwając R4 i diodę D2) zdecydowanie poprawiłoby własności stabilizatora i ułatwiłoby regulację napięcia wyjściowego. Jako zabezpieczenie nadprądowe służy tranzystor T2- gdy na R3 prąd obciążenia wymusi napięcie 0.7V, zacznie on przewodzić i ograniczy wysterowanie tranzystora mocy i w efekcie zmniejszy prąd do zadanej wartości. Iwy max = 0.7 / R3. Tego typu zabezpieczenie też jest dość archaiczne, gdyż wymaga rezystora R3 o dość dużej mocy (nie mówiąc już o stratach, jakie to generuje). Lepszym rozwiązaniem byłoby zastosowanie wzmacniacza operacyjnego w roli komparatora, który wykrywa na R3 spadki rzędu 0.1V.

Nie wiem, czy moja sugestia w czymś pomoże, w każdym razie życzę powodzenia.
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Postautor: Blasiutek » czw 03 lis 2005, 22:39

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Blasiutek
Blasiutek@vp.pl

Gość
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Postautor: Gość » wt 08 lis 2005, 10:51


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Postautor: movzx » wt 08 lis 2005, 12:25


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Postautor: Gość » pn 14 lis 2005, 17:32

Tylko jak je dolaczyc?? Jezeli ktos bylby tak mily i narysowal przykladowy schemacik bylbym dozgonnie wdzieczny. Pozdrawiam


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