Toroidal transformers calculations
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Solid State Talk all about solid state amplification.

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 27th March 2002, 09:39 AM #1 djdan   diyAudio Member   Join Date: Dec 2001 Location: Romania Toroidal transformers calculations Can anybody tell me where can I see toroidal transformer calculation . I want to built my own transformer for power supply. Thank you very much !
 27th March 2002, 12:18 PM #2 leroy diyAudio Member   Join Date: Oct 2001 Similar to 'normal' transformer calculation. Make sure the windings are linear distributed around the entire core, both primary and secundary windings, to reach maximum coupling.
 27th March 2002, 01:13 PM #3 Morrist diyAudio Member   Join Date: Jan 2002 Location: Labrador City I've often considered winding my own transformers but I could never find out how many turns should be used for the primary. Has anyone ever looked into this? Thanks, Stephen
 27th March 2002, 06:20 PM #4 Nelson Pass   The one and only     Join Date: Mar 2001 It's a complicated enough formula with core characteristics, AC voltage and Frequency. I have only designed some switching toroids, but the general formula for that is: E = (4.4 x 10^-8) * F * N * B * A Where E is the peak voltage F is the frequency N is the number of turns in the winding B is the core flux density A is the cross section of the core A number of books deal with this issue; I pulled this out of Gottlieb's "Power Supplies - Switching Regulators and Converter's" which is not necessarily a highly rated book according to the reader feedback on Amazon, and there are probably better.
 27th March 2002, 08:25 PM #5 djdan   diyAudio Member   Join Date: Dec 2001 Location: Romania Thank you for answeres ! What kind of material is used for core and the calculations for surface is similar with normal transformers ? I have one core with surface of sections at 12 square centimeters (from an old toridal transformes 800VA 230v/70v) and I want to know how many turns per volt should be used and why. The normal transformers calculations are: Power (VA) = S x S x 0,85 (where S is the surface of sections in sq. centimeters)) In my case will be : 12 x 12 x 0.85 = 122,4VA but is wrong becouse the old transformer was rated at 800VA. The number of turns per volt ( n ) for "normal trafo" is : n = 45/S for 50Hz and 230V ~ AC In my case will be : n = 45/12 = 3,75 turns /volt bit is wrong again becouse the old transformer has 2,1 turns/volt. For me is not a problem to calculate this transformer . I want to know the relations [sections of surface] - [turns/volt] for toroidal transformers . Thank you again !
 27th March 2002, 08:56 PM #6 FBJ   diyAudio Member   Join Date: Mar 2002 Location: USA At the web site www.toroid.com/kits.htm, you can find toroidal transformers kits from 80VA-750VA (I think). And with each kit the manual is suppose to have info and pictures of how to wound and calculate the primary and secondary voltages. The company is Toriod Corporation of Maryland which is pretty well know. Also at SDS Labs Audio Design there WAS a how to section with info and pictures of how some one built up one of these toroid kits. The SDS Labs web site can be found in the Directory section below on DIYaudio site under Amplifiers in Projects. I mean WAS cause I have tired to enter the site but I get" Page Not Found" message. Maybe they are updating the site or something.
 28th March 2002, 05:07 AM #7 JohnR   diyAudio Member   Join Date: Dec 2001 Location: Steak and Kidney He moved! Try http://www.quadesl.com/ (under the DAC section)
roddyama
diyAudio Moderator Emeritus

Join Date: Jan 2002
Location: Michigan
Howard W. Sams has it all!

I don't know the availability because I have a 1980 edition, but there is a Howard Sams book on transformers.

"Practical Transformer Design Handbook" by Eric Lowdon
First Edition, First Printing - 1980
Howard W. Sams & Co., Inc.

It's a 240pg soft cover book, and is 8-1/2" X 11". It starts at "Elementary Electromagnetics" (Chapter 2) and covers through properties, construction, design, applications, examples, and practical issues like buying new or used, and Tests and Measurements (Chapter 16).

One drawback is that it only has a few pages on toroids. One quote from the book is:

Quote:
 ...anyone who proposes to wind large numbers of turns onto a toroid is subjecting himself to cruel and unusual punishment.
It's an excellent reference and is recommended if you can find it.

Good Luck
Rodd Yamashita

logicaldvc
diyAudio Member

Join Date: Jan 2015
Quote:
 Originally Posted by djdan Can anybody tell me where can I see toroidal transformer calculation . I want to built my own transformer for power supply. Thank you very much !

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Aussie Amplifiers         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post BobG Swap Meet 2 25th August 2009 07:00 AM royboy5033 Parts 0 22nd June 2009 08:46 PM Rixsta Pass Labs 10 23rd April 2004 03:41 AM jhead Chip Amps 3 8th March 2004 07:58 AM nbcd Parts 2 2nd May 2003 08:36 PM

 New To Site? Need Help?

All times are GMT. The time now is 08:21 PM.