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ionut90

Bobinare trafo sursa smps cu TNY27X

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Posted (edited)

Trebuie sa construiesc un transformator SMPS cu TNY27X, miez EE25, cu o infasurare primara si doua infasurari secundare identice ca sa obtin redresat dubla alternanta un +/-15Vdc (1A !!!) si nu stiu de unde sa pornesc. M-am uitat pe net la diverse tutoriale si imi da vreo 200 de spire in primar.

1. O fi bine ?

Asta e datasheet-ul TNY27X: http://www.mouser.com/datasheet/2/328/tny274-280-4065.pdf  

si miezul care ma gandeasc sa-l folosesc e asta (2 buc.): https://www.tme.eu/ro/details/e25_13_7-3c90/miezuri-de-ferita/ferroxcube/

si carcasa asta: https://www.tme.eu/ro/details/we-2752v/carcase-si-accesorii/weisser/

2. la un transformator daca incep bobinajul de la un capat al carcasei la celalalt capat si apoi creez un secundar inceput din partea opusa, e ca si cum as obtine secundarul defazat cu 180 grade ?

3. e musai sa pun intrefier intre cele doua E-uri ? :scratchchin:

 

Edited by ionut90

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Posted (edited)

Asta inseamna 30W

Eu ma uit prima oara la ce au facut altii si in mod special la Myrra, pentru E25 au urmatoarele date:

987792496_myrrae25.thumb.jpg.4f52127dd409b9366adf770c063a5f08.jpg

daca ramii la E25 ( un pic la limita ca si putere si inghesuit la bobinat) atunci mai ai nevoie de clemele urmatoare:

https://www.tme.eu/ro/details/b66208a2010x000/carcase-si-accesorii/epcos/

TNY280 o duce bine la max 20W.

Eu as porni de la ETD29, Myrra spune:

1187267676_myrraetd29.thumb.jpg.5b5123db7984f405ba2517b6dc2ef2bb.jpg

2 miezuri ETD29, carcasa si doua cleme, TOP254YN.

9 spire pentru 15V. trebuie sa incapa pe acelas strat cele doua secundare ( pentru +15 si -15V)

La flyback neaparat intrefier!

Ramine sa hotarasti pe ce directie mergi. Si neaparat o schema unde sa apara inceputurile infasurarilor.

Edited by RockDok

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@ionut90

1. cand spui flyback spui intrefier. Intotdeauna!
2. Tny la 30W, crapa.
3. gasesti trafuri ptr tny gata facute(bobinate cu diverse secundare) intre 5 si 10 lei. 

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