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SMPS Transformer Turns Equations Help
SMPS Transformer Turns Equations Help
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Old 21st January 2006, 04:01 PM   #1
venki is offline venki  India
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Question SMPS Transformer Turns Equations Help


I am planning to make an SMPS for my new ampilfier. It requires a power supply of +-20 V 10A (rms). I would like to know the equations for Calculating
1. the number of turns in primary/Secondary

2. the guage of wire to be used.

I intend to use 230V ac (rectified) as input. It would be of great help if somebody could post the equations.

Thanks in Advance,

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Old 21st January 2006, 08:04 PM   #2
poobah is offline poobah  United States
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This application note applies to a specific part... which would not work for you... but it is still a good collection of data & formulas.

You will be looking for a "buck" or "forward" convertor.


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Old 13th February 2006, 06:16 PM   #3
N-Channel is offline N-Channel  United States
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Default Turns Ratio


Here is a laundry-list of books I regularly recommend to members asking questions about SMPS design in general, or specific ones about the different sections of a Switcher:

1) High Frequency Switching Power Supply Design - Geo. Chryssis (c) 1989 (Don't know ISBN)

2) Power Supply Cookbook (EDN Series for Design Engineers)
by Marty Brown; 2nd edition May 2001 ISBN: 075067329X

3) Switchmode Power Supply Design - Abraham I. Pressman (Don't know year or ISBN)

Chryssis' book is, perhaps the best on transformer design. He includes design procedures for both Forward and Flyback topologies. I have used his procedure to design many SMPSs with great success!

Hope this helps!

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Old 14th February 2006, 09:48 PM   #4
cerrem is offline cerrem  United States
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Hi Venki.....
I believe I Emailed you a few weeks ago regarding this design...
I need much more info.....
What is the input voltage range for this switcher....
I recomend a Push-Pull converter in current mode...

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Old 16th February 2006, 01:02 AM   #5
jackinnj is online now jackinnj  United States
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SMPS Transformer Turns Equations Help
Default got Excel?

here's a link to a spreadsheet I cobbled for push-pull converters -- works pretty well with the Linear Tech series of switching chips so it should work with others: http://www.tech-diy.com/smps_xfmr.xls
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