Transformer Winding

microsim444 · 31st January 2009, 08:03 AM

What is the best way to wind the SMPS transformers?

All primary - Secondary ?

Primary - All secondary - Primary ?

How to calculate the wire thickness needed. and number of turns for each side

Output voltage required is +/- 90VDC with 5Amp for each rail at 50 Khz

Cores available is ETD49, ETD 59

Thanks for the help

paladinox · 1st February 2009, 04:39 PM

Try:
http://sziget.mine.nu/~danko/letolte...tion_notes.pdf

and
Practical Switching Power Supply Design -MOTOROLA.pdf
at
http://www.4shared.com/file/67222720...OROLA.html?s=1

microsim444 · 2nd February 2009, 12:31 PM

Many thanks for those links, they have very good informations.

What power do we expect from the ETD-59 at 125KHz

paladinox · 2nd February 2009, 03:43 PM

Be careful with skin effect at this freq.

I think this core can handle more than 2kw at 125kHz.

megajocke · 3rd February 2009, 09:58 PM

Even more than 2kW should be possible but proximity effect becomes a real problem at those frequencies and you need to be very careful. Litz wire or foil winding is probably the best solution. At lower frequency it should be possible to use standard wire and you can still get quite a lot of power through an ETD-59 even at 25kHz...

31st January 2009, 08:03 AM	#1
microsim444 Account Disabled Join Date: Oct 2008	Transformer Winding What is the best way to wind the SMPS transformers? All primary - Secondary ? Primary - All secondary - Primary ? How to calculate the wire thickness needed. and number of turns for each side Output voltage required is +/- 90VDC with 5Amp for each rail at 50 Khz Cores available is ETD49, ETD 59 Thanks for the help

2nd February 2009, 12:31 PM	#3
microsim444 Account Disabled Join Date: Oct 2008	Hi Many thanks for those links, they have very good informations. What power do we expect from the ETD-59 at 125KHz

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1st February 2009, 04:39 PM	#2
paladinox diyAudio Member Join Date: Jan 2009	Try: http://sziget.mine.nu/~danko/letolte...tion_notes.pdf and Practical Switching Power Supply Design -MOTOROLA.pdf at http://www.4shared.com/file/67222720...OROLA.html?s=1

2nd February 2009, 03:43 PM	#4
paladinox diyAudio Member Join Date: Jan 2009	Be careful with skin effect at this freq. I think this core can handle more than 2kw at 125kHz.

3rd February 2009, 09:58 PM	#5
megajocke diyAudio Member Join Date: Jan 2003 Location: Solna	Even more than 2kW should be possible but proximity effect becomes a real problem at those frequencies and you need to be very careful. Litz wire or foil winding is probably the best solution. At lower frequency it should be possible to use standard wire and you can still get quite a lot of power through an ETD-59 even at 25kHz...

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