2600w Smps

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#21
HI,
those transformers from the picture seems to look like those from computer power supply .
In fact most of the computer power supply are rated at 450w peak ,and a maximum of 250w .

In that picture are 8 transformers (8x250w=2000w).





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sorry for my english
 
#24
dexter2003 said:
I wont to built my smps with only one transformer and these because i want to minimize the space ....
Click to expand...

WOW!!! 2.6kW from one toroid! :bigeyes:

Are you going to use a really ligh frequency and low primary turn count to make such power?

To get really big toroid cores:
http://www.cwsbytemark.com/prices/corepwr.php
(scroll to bottom)

They have a 5 inch, and also a 4 inch double height core, along with other sizes. Maybe if you use a LOT of THICK coil wire, and a HUGE core, you could make these work.
 
#28
dexter2003 said:
Hi ,
Alexclaire
those 2*1800uf/200v will give you just 900uf ...I will have 1840uf at 320v ,and my amplifier has 2000w ,but I will newer use even 1600w.
The smps ,in the worst case will deliver 2000w ...
Click to expand...

Nice!!! :bigeyes:

Do you think it's better to run Amplifier from SMPS from Mains AC instead of 60hz transformer? I'm wanting to build one for a sound system because it's all 4 ohm and needs high current. I also don't like AC hum that can come out of the speakers at 60 hz. What kind of PWR transistors do you use at that side of the SMPS? I tried 350V MJL4281/4302 and blew them up.
 
#32
AFTER 2 YEARS I'm back on this topic , now it's about 5 kw smps , full bridge
so I will use the next parts :
MUR460 antipararel with the igbt
IRG4PC50W
EE71 (6.8CM^2)

AND 5 KW PFC
...
I calculated the transformer at 400v input so at 100khz i need just 10 turns( i use 12) primary , at bmax=1500 .... the secondary it's at 150v and i guess 5 it's enought (with 12 turs ) and will be around 166v .......

I think i will use2* ir2110 , but i don't know how it will handle those igbts at 100 khz with 10 ohms Rg

The triky part is the transformer , i have cooper foil about 0.1mm thick by 40 mm wide , but i can buy also 3mm litz wire , so the question is : witch is better the cooper foil (I'm afraid for the capcitance that those foil will create)
Also litz wire is good but i don't think it will fit into the transformer , because for the secondary i will use 2*150 v , each 150 will be bade with only 2 diodes (center taped secundary for each 150v) ...to minimase loses.
Also the transformer doesn't have bobin , so i will use sticlotextolit to make it , for the cooper tape(if i will use ) i have hostfan tape
http://i34.tinypic.com/2h699ch.jpg

.....
If anyone have something to say about what to use , please write :
BTW it's not regulated JUST LLC ...
 
#33
parts
 

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#37
Dexter,
In 2001, i have built SMPS 2500W.
- Bridge mosfet APT6030
- Litz wire on "3c85" (not sure, 9 years ago)
- working frequency around 500kHz on low load, 150kHz on high load
Actually the most problem is pcb layout/wiring.

Regards,
 
#38
ihsan said:
Dexter,
In 2001, i have built SMPS 2500W.
- Bridge mosfet APT6030
- Litz wire on "3c85" (not sure, 9 years ago)
- working frequency around 500kHz on low load, 150kHz on high load
Actually the most problem is pcb layout/wiring.

Regards,
Click to expand...

Interesting , it seems that yours is resonating depanding on load , can you post a schematic for it ?
I think mine will be with 100khz , LLC , but with frecvency shifting is more interesant .
 
#39
Yes, resonant system. Efficiency around 90%, for 2500W output, around 2780W input. So around 280W heat dissipation when full load. This is very hot. I use 2 dc fans and a big customized heatsink for the cooling.
ok, i'll look for the schematic.

Regards,
 
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