SMPS Transformer Turns Equations Help

venki · 21st January 2006, 05:01 PM

Hi,

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,

Venki.

poobah · 21st January 2006, 09:04 PM

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.

link

N-Channel · 13th February 2006, 07:16 PM

Venki,

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!

Steve

cerrem · 14th February 2006, 10:48 PM

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...

Chris

jackinnj · 16th February 2006, 02:02 AM

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

21st January 2006, 05:01 PM	#1
venki diyAudio Member Join Date: May 2005 Location: india	SMPS Transformer Turns Equations Help Hi, 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, Venki.

13th February 2006, 07:16 PM	#3
N-Channel diyAudio Member Join Date: Mar 2003 Location: Sol System	Turns Ratio Venki, 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! Steve

16th February 2006, 02:02 AM	#5
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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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21st January 2006, 09:04 PM	#2
poobah diyAudio Member Join Date: Nov 2005	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. link

14th February 2006, 10:48 PM	#4
cerrem diyAudio Member Join Date: Jun 2005 Location: San Diego, CA	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... Chris

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