
Home  Forums  Rules  Articles  The diyAudio Store  Gallery  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 

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 

Thread Tools  Search this Thread 
18th November 2009, 04:05 PM  #1 
Account Disabled
Join Date: Oct 2008

SMPS Formula
Hi.
What is the turns ration to get +100V DC from ETD59. and what is the best frequency to do that. wire size, the winding advice Input voltage 220V~ Reference Schematic is attached. what is the formula that can be used to calculate that, any help? 
18th November 2009, 07:04 PM  #2 
diyAudio Member

hi
for 50khz 1kw primer 14 turn(10x0.65mm wire) , sekonder 2x 14 (8x0.65mmwire)turn feed back : zener 97v ,resistor 1kohm Last edited by umut1001; 18th November 2009 at 07:07 PM. 
18th November 2009, 07:14 PM  #3 
diyAudio Member

lastest version sch.

19th November 2009, 07:29 AM  #4 
Account Disabled
Join Date: Oct 2008

W

19th November 2009, 11:59 AM  #5 
diyAudio Member

If this is intended to be a regulated supply, the output inductor should be placed after the diodes, not before
If it works with the inductor in the wrong place, the waveforms are likely to be very funny... This post discusses obtaining cores and calculating inductors, but the B (peak flux density) formula and the core loss formula are valid for transformers too: Bigt In a transformer you have to select primary turns so that peak B does not exceed the saturation level of the core material in worst case conditions (highest input voltage, highest duty cycle) and observing that peak B during normal operation results in reasonable core losses (like 4W6W for an ETD59, but this is just an intuitive estimation based on size). Note that many materials will exhibit lower losses as they get hotter. Secondary turns are calculated taking into account that in a transformer the same voltage drops in all the turns (at least without load) so turns ratio is just voltage ratio. Voltage ratio for regulated suplies is chosen so that output voltage can be mantained down to the lowest input voltage desired...
__________________
I use to feel like the small child in The Emperor's New Clothes tale Last edited by Eva; 19th November 2009 at 12:11 PM. 
19th November 2009, 12:11 PM  #6  
Account Disabled
Join Date: Oct 2008

Eva?
Quote:
Eva, first you are always give nice comments and it looks that you have deep experiance. Why you just for ONE time give a solution? give informations that HELPS solving problems? Are you in the process of building any new SMPS? 2KW 

19th November 2009, 01:46 PM  #7 
diyAudio Member

I think I have given the information that you need many times since I joined the forum 6 years ago. I can repeat it from time to time but not for everyone that asks because this is very time consuming, and everyone wants the things already calculated instead of learning how to do the math themselves.
I'm finishing a long class D project, very complex, with many gadgets, but also extremely efficient, it's doing 1500W music on 4 ohm and I have not yet installed the heatsink (bare TO220 devices) Next project is SMPS related but quite unconventional (single stage nonisolated AC mains to regulated DC).
__________________
I use to feel like the small child in The Emperor's New Clothes tale 
19th November 2009, 02:16 PM  #8 
diyAudio Member

If you want to make money from it, you need to do it by yourself, why would Eva do this for you? She needs money too you know

19th November 2009, 02:17 PM  #9 
diyAudio Member


19th November 2009, 03:46 PM  #10  
diyAudio Member

Quote:


Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
box formula  crs1  MultiWay  29  23rd January 2008 09:53 AM 
Q formula  PeteMcK  MultiWay  10  17th January 2008 07:42 PM 
Loudspeaker formula  freedom  MultiWay  17  18th November 2004 08:49 PM 
Need help on xover formula  Jay  MultiWay  3  12th August 2003 05:28 PM 
Anyone have the formula for...  Rino odorico  MultiWay  4  22nd January 2003 04:07 PM 
New To Site?  Need Help? 