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Jakie dobrać trafo do prostownika?
Janko

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Cześć
Chciałbym zmontować prostownik i potrzebuję konsultacji jakie trafo. zakupić.
Chcę zmontować prostownik do ładowania akumulatorów samochodowych 12V/120Ah.
Prostownik do 15A .
Czy te z linku transformatory nadawały by się do prostownika.Jaki proponujecie?
http://allegro.pl...04225.html
http://allegro.pl...44587.html
http://allegro.pl...75098.html
http://allegro.pl...13960.html
Edytowane przez Janko dnia 20-02-2012 19:35
 
romek_xx

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Witaj. Według mnie, powinieneś sobie od razu odpuścić te transformatory co mają wyjście 2x6V lub 12V. Żeby dobrze ładować akumulator, musisz mieć napięcie większe niż 14 po wyprostowaniu. Prostownik powinien mieć albo dużo odczepów na wtórnym, aby napięciem mieć możliwość regulacji ładowania, albo odpowiednio większe napięcie, aby to rozwiązać elektronicznie. Masz jakiś projekt, schemat lub pomysł jak to chciałbyś rozwiązać, czy dopiero szukasz takiego pomysłu?
 
Janko

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Jeżeli chodzi o projekt czy schemat to mam kilka( zapożyczyłem z forum elektroda), ale teraz jestem na etapie poszukiwania trafo i coś znalazłem na allegro (linki zamieściłem) Potrzebuje trafo do prostownika, który naładowałby akumulator samochodowy taki od 80/100ah. Prostownik musiałby mieć zabezpieczenie przed odwrotnym połączeniem,z płynna regulacją prądu,oraz z układem zabezpieczającym aku. przed przeładowaniem.
Sprzedający na allegro pisze ,ze sprzedaje trafo do prostownika.
Z tych co podałem jaki byłby najlepszy ,który to według ciebie?
ten może?http://allegro.pl...13960.html

Albo podaj mi oznaczenie takiego trafo to coś poszukam w necie lub u siebie w sklepach.
Edytowane przez Janko dnia 20-02-2012 19:53
 
romek_xx

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Janko napisał/a:... Sprzedający na allegro pisze ,ze sprzedaje trafo do prostownika...


Może i napisał tak i może to być zgodne z prawdą, ale nie jedynie do ładowania akumulatorów robi się prostowniki. :D

A w tych schematach które masz, nie ma podanych parametrów lub symboli transformatorów? Jeśli to ma być z płynną regulacją i bajerami, to równie dobrze, do takiego prostownika mógłby być transformator o napięciu na wtórnym rzędu 20-24V a byłby do akumulatorów 12V.
Edytowane przez romek_xx dnia 20-02-2012 19:53
 
Janko

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Mówiąc szczerze nie znam się na schematach. Prostownik mógłbym powierzyć do zrobienia komuś tylko ten ktoś nie ma teraz czasu na gromadzenie materiałów powiedział mi ,że z netu dowiem się wszystkiego dlatego pytam i szukam. Oczko
Edytowane przez bastek206p dnia 20-02-2012 20:31
 
Janko

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schemat
images50.fotosik.pl/1390/6bacf61f50abc5f0m.jpg
Edytowane przez Janko dnia 20-02-2012 20:04
 
romek_xx

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No i dobrze trafiłeś, ale dopytuje się o te dane, bo szkoda może byłoby szukać na darmo i ryzykować kupno czegoś co Ci się nie przyda, jak może masz w schemacie konkretnie do tego układu podany model transformatora.
Ja mam na ten przykład najprostszy bez elektroniki, tylko mostek Gretza, amperomierz, dwa zabezpieczenia (na pierwotnym i wtórnym) i 8 wyjść na wtórnym co jakieś 0,5V i układ czasowy wyłączający prostownik po zadanym (ustawiony na 10godz.) czasie. Zmieniając napięcie ustawiam tak aby nie był za duży prąd ładowania.
Edek:... aha, już wrzuciłeś, OK.

Edek2: no i widać, napięcie już po wyprostowaniu z transformatora masz mieć 24V.
Edytowane przez romek_xx dnia 20-02-2012 20:10
 
Janko

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A najlepiej gdyby to był prostownik z tego schematu.
images50.fotosik.pl/1390/f0660a80c59df34em.jpg

No i potrzebuje to tego schematu odpowiednie trafo mógłbyś mi dobrać ? Jakie powinien mieć parametry to zacznę takie szukać.
Edytowane przez bastek206p dnia 20-02-2012 20:31
 
romek_xx

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No to ten z kolei ma mieć 18V zmiennego. Czyli żaden z tych które znalazłeś nie pasuje ani do jednego ani do drugiego schematu.
 
Janko

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OK a zatem gdybym miał wpisać do wyszukiwarki to jakiego trafo miałbym szukać. podaj jakie musiałby miec oznaczenia to zaraz rozpocznę szukanie w necieUsmiech
 
romek_xx

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Zacząłem patrzeć w katalogach, ale jest tego trochę... :D
Szukaj np. "katalog transformatorów sieciowych"

Edek: Raczej musisz szukać czegoś większego, w granicach 300-1000W, w katalogach masz podane napięcie wtórne i prąd wtórnego.
Edytowane przez romek_xx dnia 20-02-2012 20:30
 
Janko

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OK dzięki za pomoc jak coś znajdę to ci podeśle i sprawdzisz czy się nadaOczko
 
romek_xx

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OK, ja albo ktoś z wolnym czasem który akurat się trafi, ale pomoc powinieneś dostać. Później też przy płytkach czy składaniu, jakąś poradę dostaniesz. :D
 
Janko

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Dzięki wreszcie jakieś normalne forum...te forum elektroda jest generalnie OK, ale admini są nie życiowi i zamiast krotko odpowiedzieć to cytują ....ale paragrafy regulaminu i do kosza. Początkujący nie wiele tam napiszą postów z pytaniami ,bo to forum dla "profesjonalistów"Szok, jeden mądrzejszy od drugiego czyt. przemądrzały:D
Edytowane przez Janko dnia 20-02-2012 21:35
 
joon

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Janko: tylko uważaj przy budowie prostownika na parę naprawdę ważnych spraw:
-zbyt wysokie napięcie na wyjściu grozi gazowaniem dlatego na praktycznie każdym aku jest zapisane maksymalne napięcie ładowania na poziomie 13,8/14,4
-prąd rzędu 10-15A może spowodować silne nagrzewanie złączy, elementów półprzewodnikowych, powoduje też znaczny spadek napięcia na zbyt cienkich przewodach
-dobre klemy to podstawa- na tym naprawdę nie warto oszczędzać
-prąd ładowania- zalecany prąd to Q/10 ale.... przecież to akumulatory rozruchowe gdzie prądy rozładowujące wynoszą czasem nawet 10Q! dlaczego ładowanie ma przebiegać dużo mniejszym prądem?
-ładowanie podtrzymujące- według mnie nie ma sensu, chyba że w układzie który cyklicznie ładowanie/rozładowanie w stosunku 20:1 (ponoć w taki sposób odsiarcza się akumulatory, ja na przykładzie 4 sztuk zauważyłem niewielką różnicę)


A osobiście to wolę prostowniki na bazie zmodyfikowanych zasilaczy impulsowych Oczko
 
kamieniarstwo-przemysl.pl
elbober

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Joon, wprawdzie temat ładowania akumulatorów jest stary jak aku i związane z tym dywagacje. Wyjaśnię: ładowanie prądem 10-o godzinnym jest jest "górną" granicą efektywnego ładowania, zarazem "wysoko sprawnym" i nie powodujący zbędnego nagrzewania elektrolitu i płyt. Prąd 20-o godz. jest jeszcze bardziej efektywny ale czas jest 2x dłuższy. Gazowanie i większe nagrzewanie jest objawem naładowania, po którym aku nie zgromadzi nic więcej, a nadwyżka "idzie" w elektrolizę wody i obieg prądu w elektrolicie (bardziej złożony proces).
"Odsiarczanie" było przy jeszcze niższym prądzie niż Q/20h i już się nie stosuje - mało skuteczne.
Jeszcze jedno. W dużych prostownikach stosuje się sterowanie strony pierwotnej (niskie prądy, ale ! napięcie sieci 230V !). Łatwiej sterować mniejszym prądem, niż kilkunastoma A (a do rozruchu kilkaset A) a napięcie dla np. triaka to nie problem (i nie tylko triaki).
Janko, z Twoich założeń, ten prostownik, musiałby być moc rozbudowany, a układy pomiarowo-sterujące oddzielnie zasilane. Jest to rzecz jasna do wykonania, ale wymaga sporej wiedzy i pomocy.
 
Janko

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<p>
romek_xx napisał/a: No to ten z kolei ma mieć 18V zmiennego. Czyli żaden z tych kt&oacute;re znalazłeś nie pasuje ani do jednego ani do drugiego schematu.
</p>

a zatem muszę szukać właśnie takiego o jakim piszesz czyli 18V/20V


....elbober... masz rację jeżeli chodzi o trudność wykonania prostownika z tego drugiego schematu. Dlatego po zgromadzeniu materiałów zechcę zbudowanie go powierzyć komuś , kto POTRAFI to zrobić DOBRZE. Dzięki "chłopy" za porady Oczko
Edytowane przez Janko dnia 22-02-2012 22:36
 
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elbober mógłym obalić każde twoje zdanie z marszu Oczko
To nie jest po złości, trochę prostowników zrobiłem i sprzedałem. Po wypłacie zrobię, uruchomię i zaprezentuję jeden z nich- a nawet jak chcesz dam do testów- myślę że wtedy zmienisz lekko zdanie, zwłaszcza z ładowaniem stały prad a później stałe napięcie Oczko
 
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