300W SMPS for amp. from PC PSU - diyAudio
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Old 27th August 2013, 06:38 AM   #1
Acca is offline Acca  Serbia
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Default 300W SMPS for amp. from PC PSU

Here's 300W SMPS based on PC power supplies.
A few pictures are not my,i'ts from my friends.
Base drive transformer is toroid from CFL lamp.
Storage core is yelow toroid core from PC PSU too.
They have 0.5V per one turn.You can use more cores glued together.With two cores value is 1V/turn.
You can calculate it this way:
Uout * 2 / number of cores.
This coil is attached after output diodes and before electrolytes.
I posted pictures,all is on it
Schematic is for 12V,for other voltages ee33 have 4V per turn.Resistor on output can be calculated this way: R=Uout/0.02
Attached Images
File Type: jpg Uni4.JPG (74.1 KB, 1121 views)
File Type: jpg PTDC0002.JPG (115.1 KB, 1060 views)
File Type: jpg IMG_20130729_194812-1.jpg (65.2 KB, 1011 views)
File Type: jpg BDT.JPG (19.0 KB, 990 views)
File Type: jpg PTDC0004.JPG (127.9 KB, 972 views)
File Type: jpg Fotografija1233.jpg (170.1 KB, 464 views)
File Type: jpg Noload.jpg.jpg (63.5 KB, 403 views)
File Type: jpg 300w-load.jpg.jpg (35.3 KB, 355 views)
File Type: jpg ube uni4 100w.JPG (15.2 KB, 304 views)
File Type: jpg Uce uni4.JPG (19.6 KB, 210 views)

Last edited by Acca; 27th August 2013 at 07:55 AM.
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Old 27th August 2013, 06:45 AM   #2
Acca is offline Acca  Serbia
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If you wish,you can short circuit protection.This can be make by place storage coil in series with primary ee33.I used 24turns,but coil is hot.After this,storage coils after diodes isn't needed.
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Old 27th August 2013, 07:00 AM   #3
stewin is offline stewin  Kenya
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hi acca very simple and powerfull. do you have a complete schematic with info on each former (coil turns ) . also what is the switching frequency and can i use mosfets like irf740 / irfp460 for more power .
thanking you in advance stewin

Last edited by stewin; 27th August 2013 at 07:03 AM.
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Old 27th August 2013, 07:19 AM   #4
Acca is offline Acca  Serbia
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Stewin,I'll post schematic when draw it.
Multimeter in picture shows frequency ~40khz.
No,they use bipolar transistors,can used MJE13009 for ~500W
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Old 27th August 2013, 07:54 AM   #5
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Updated schematic:
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Old 28th August 2013, 07:34 PM   #6
stewin is offline stewin  Kenya
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very very nice and interesting schema . i will redraw it and make a board.

can i use etd49 for more power? and how efficient is the protection?

what makes fet not to be used? the switching freq is fair enough 40khz.

Last edited by stewin; 28th August 2013 at 07:50 PM.
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Old 28th August 2013, 10:50 PM   #7
mayster is offline mayster  Poland
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I like the simplicity of that project. I have some questions:
- what type are the T1 and T2 transistors ?
- can the base transformer be a "yellow one" too ?
- how thick should be the wires on the base transformer and the main one, if we want to wind one for other output voltage ?
- i have a new etd39 core, can I use it in that project, or will it change everything ?

Greetings, Andrzej
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Old 29th August 2013, 07:08 AM   #8
Acca is offline Acca  Serbia
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@stewin
ETD49 can be used for 1kW,but with stronger transistors.I calculate 1A of transistor for 40W power out.
Protection is good,but it's better to vind in air core.I tried with 100 turns on solder box (i dont know how to explain this,on this "box" is wounded solder)
You MUST know difference betwen bipolar transistors and fet's.Learn it.
Yes it's ~40khz.

@mayster
T1,T2 any transistor from AT/ATX,13007,13009,2sc2625,2sc4242,etc.Can be any 400-500V,curent 1A for 40W of output power (mje13007 is 8A.This means 8*40=320W smps)
Send me picture of your BDT (base drive transformer)
You can calculate thickness,use 3.5A/mm^2
If you use 300W smps this is ~2A at 160V (half of DC input,this is primary voltage on ee33)
One turn have 2A/3.5A/mm^2= 0.6mm^2
Four turns have 4* smaller diameter (you can use 0.2mm^2)
You can use etd39,and it's enough for ~400W
But you must calculate windings on it.Primary have 160V,and feedback must have 10-12V.
I'll post simple formula tonight.
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Old 29th August 2013, 12:36 PM   #9
Acca is offline Acca  Serbia
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Formula for calculating transformers:
N=U*1.000.000 / Ae*dB*f*k
N-number of turns
U-input voltage (160V)
Ae-cross section of core (see datasheet)
dB-Inductance in T,for pushpull converters use 2B,for forward and flybac use 1B.B is typicaly 0.2T
f-frequency in khz
k-constant,for sine wave converters (LLC,etc...) use 4.4,for square wave(this smps) use 4.
In this smps peak voltage is voltage at DC output,there's no multiplying by 1,41 like sine wave (classic 50Hz transformer)
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Old 29th August 2013, 12:38 PM   #10
Acca is offline Acca  Serbia
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Calculate feedback winding for 10-12V
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