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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.
I have fixed your post.

jagdeepsingh2 3rd December 2012 07:27 PM

Quote:

Originally Posted by KatieandDad (Post 3268890)
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

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

jagdeepsingh2 3rd December 2012 07:30 PM

help
 
Quote:

Originally Posted by KatieandDad (Post 3268890)
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

what size of foil have to use please help im not understanding

jagdeepsingh2 3rd December 2012 07:36 PM

Quote:

Originally Posted by Pano (Post 3268899)
: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 (Post 3268937)
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 (Post 3268908)
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 (Post 3268948)
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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