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 jagdeepsingh2 3rd December 2012 07:09 PM

smps transformer

Hello I need help

I'm making an inverter welder
Transformer data:
E 71/33/32 N87
For 50v output
I have 13 primary turns 0.67mm x 20 wires and 8 secondary turns 0.67mm x 58 wires.
The problem is:
The secondary coil I want to wind with copper foil not with copper wires
So how can I calculate how many turns of copper foil I have to make? And dimensions of copper foil? Please help

 KatieandDad 3rd December 2012 07:14 PM

Exactly the same number of turns as for wire.

Wire CSA is the same regardless of if it is foil or wire.

 Pano 3rd December 2012 07:20 PM

:cop: Please do not use all caps when posting. Read the forum rules, they are here.

 jagdeepsingh2 3rd December 2012 07:27 PM

Quote:
 Originally Posted by KatieandDad (http://www.diyaudio.com/forums/power-supplies/224902-smps-transformer-post3268890.html#post3268890) Exactly the same number of turns as for wire. Wire CSA is the same regardless of if it is foil or wire.
for secondry i have 0.67mm x 58 wires

and thanks for quickly reply in other forums they reply after 1 month

 jagdeepsingh2 3rd December 2012 07:30 PM

help

Quote:
 Originally Posted by KatieandDad (http://www.diyaudio.com/forums/power-supplies/224902-smps-transformer-post3268890.html#post3268890) Exactly the same number of turns as for wire. Wire CSA is the same regardless of if it is foil or wire.
for secondry i have 8 turns of 0,67mm x 58 wires

 jagdeepsingh2 3rd December 2012 07:36 PM

Quote:
 Originally Posted by Pano (http://www.diyaudio.com/forums/power-supplies/224902-smps-transformer-post3268899.html#post3268899) :cop: Please do not use all caps when posting. Read the forum rules, they are here. I have fixed your post.
sorry

 SemperFi 3rd December 2012 07:47 PM

Why do u want to use foil? That is only used in planars where sw-freq is very high, b/c that requires low inductance and few turns. It will likely become very capacitive with that many turns.

 jagdeepsingh2 3rd December 2012 07:52 PM

Quote:
 Originally Posted by SemperFi (http://www.diyaudio.com/forums/power-supplies/224902-smps-transformer-post3268937.html#post3268937) Why do u want to use foil? That is only used in planars where sw-freq is very high, b/c that requires low inductance and few turns. It will likely become very capacitive with that many turns.
i want to make this

Welding inverter 100A

 payloadde 3rd December 2012 08:01 PM

Quote:
 Originally Posted by jagdeepsingh2 (http://www.diyaudio.com/forums/power-supplies/224902-smps-transformer-post3268908.html#post3268908) for secondry i have 0.67mm x 58 wires what size of foil i use please help i'm not understanding and thanks for quickly reply in other forums they reply after 1 month
Your secondary wire is 0.67mm in diameter ?
so cross section area (csa) of one strand is pi*d*d/4 = 0.35 mm2, right ?
0.35 mm2 times 58 strands = approx. 20 mm2
so you need at least 20 square mm cross section area of your foil.

Thermal properties of foil may be different, I don't know.
Also, if inverter frequency is high, multiple strands of wire is much better because of skin effect.

 jagdeepsingh2 3rd December 2012 08:45 PM

Quote:
 Originally Posted by payloadde (http://www.diyaudio.com/forums/power-supplies/224902-smps-transformer-post3268948.html#post3268948) Your secondary wire is 0.67mm in diameter ? so cross section area (csa) of one strand is pi*d*d/4 = 0.35 mm2, right ? 0.35 mm2 times 58 strands = approx. 20 mm2 so you need at least 20 square mm cross section area of your foil. Thermal properties of foil may be different, I don't know. Also, if inverter frequency is high, multiple strands of wire is much better because of skin effect.
you are a genius man thank you very very much

but one other thing i calculated all with this software diysmps

but one thing is not clear if i have to wind for first primary or secondry turns

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