1kW smps project (based on MicrosiM design)
- Thread starter ludo3232
- Start date
Hello all, i`m new member so excuse me if i ask stupid question.
My question is about the output voltage of the supply. As i see there is no feedback so output voltage must depend on the trafo.
If i`m right, can you post (after you post the final version) some table may be or number of turns per volt so everyone will bi able to adjust the output voltage for it`s needs.
Thank you for your time.
My question is about the output voltage of the supply. As i see there is no feedback so output voltage must depend on the trafo.
If i`m right, can you post (after you post the final version) some table may be or number of turns per volt so everyone will bi able to adjust the output voltage for it`s needs.
Thank you for your time.
output voltage
Yes, thats true.
This SMPS is not a regulated SMPS, like those uses feed back with opto coupler.
this method is better for audio amplifiers usage.
Ludo will post every thing soon, including transformer construction.
You can change output voltage by adjusting the turns of transformer, with +- 5% voltage drop at full Load witch is perfect!
Yes, thats true.
This SMPS is not a regulated SMPS, like those uses feed back with opto coupler.
this method is better for audio amplifiers usage.
Ludo will post every thing soon, including transformer construction.
You can change output voltage by adjusting the turns of transformer, with +- 5% voltage drop at full Load witch is perfect!
First - Thank you for quck response. 
Second -
I will wait for the final version
p.s. One question more - Can we use EI cores, and if we can is EI33 good for 200-300W.
Second -
No it is not perfect it is awesome
I will wait for the final version
p.s. One question more - Can we use EI cores, and if we can is EI33 good for 200-300W.
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Yes, these are put in PC PSU rated for 300-400-500W, but for now i will not pull more than 150-200W from this supply. But in the future i may need this power. I have some of these cores - that is why i`m asking this
But EI33, I dont know if you are talking about those cores already found in PC SMPS?
Corvett
New member
Yes, these are put in PC PSU rated for 300-400-500W, but for now i will not pull more than 150-200W from this supply. But in the future i may need this power. I have some of these cores - that is why i`m asking this
I dont know f you can dissemble the EI33 cores found into PC SMPS? -)
That core should deliver 300W without problems, But i cant find any informations on how to calculate turns for EI33
4 out of 5 times i have success with disassemble the core. I put it into hot water 80-90 degrees for about 10-15 min or more. In this conditions the glue is melting and you can easily disassemble it.
But after all i think that there will be no place for windings
4 out of 5 times i have success with disassemble the core. I put it into hot water 80-90 degrees for about 10-15 min or more. In this conditions the glue is melting and you can easily disassemble it.
But after all i think that there will be no place for windings
No place?
I think you should remove all old wire, and re wind it again to meet your needs.
Usually PC SMPS, old ones, uses Half bridge topology, and the primary side of the transformer should be OK, if you change the secondary windings to your needs, it may work, I never tried it before ::SD
Also I cannot find any details about the EI33 core, if you locate datasheets for that core it will be great, then I can guide you for making it from scratch
I dont know that this datasheet has all the info.
If i can use it for that project ok, if not it is not a problem i will buy ETD49.
If you have any project useing EI33 i will be happy to see it.
Primary windings of EI33 trafo is 22 then isolation, secondary and then another 22 all of them are single wire.
If i can use it for that project ok, if not it is not a problem i will buy ETD49.
If you have any project useing EI33 i will be happy to see it.
Primary windings of EI33 trafo is 22 then isolation, secondary and then another 22 all of them are single wire.
Etd44
ETD44 is perfect for 900W, you only need to make some simple modifications to the PCB and transformer windings
ok, in the moment i have ETD44 and EE55 i will try to find and ETD49.
I will wait for the final version.
ETD44 is perfect for 900W, you only need to make some simple modifications to the PCB and transformer windings
This is ok for me, i will be happy if you can guide me for the windings later.ETD44 is perfect for 900W, you only need to make some simple modifications to the PCB and transformer windings
vikramjoshi
New member
Hello,
This is my first post on this forum. there is lots of good work going here.
I want to make a smps for my Audio Amplifier. Needed psu is 75-0-75 6 amperes (900 va) 1 Channel, so what should be its Smps Equivalent.
First i will have to look for available components.
Happy Diy
This is my first post on this forum. there is lots of good work going here.
I want to make a smps for my Audio Amplifier. Needed psu is 75-0-75 6 amperes (900 va) 1 Channel, so what should be its Smps Equivalent.
First i will have to look for available components.
Happy Diy
Thanks for joining.
There are many guys around here working around the SAME project, if you wish to play with same one ludo made. here you go
PLEASE
Dont hesitate to ask me any thing before you make that SMPS. Ask here at forums you will get faster response, and all will get help
vikramjoshi
New member
Hello MicrosiM,
Ok looks good enough, Acquiring parts will not be a problem. What will be the voltage of this smps and any assembling instructions if possible.
Thank You
Ok looks good enough, Acquiring parts will not be a problem. What will be the voltage of this smps and any assembling instructions if possible.
Thank You
output voltage depends on secondary turns of the transformer you will make.
If you wait some time, ludo will show up a new updated model of the smps, using IR2110
Unless you want to have good experience by making the two models
ludo3232
Member
Hi all!
Sorry for long wait...
Now the 1kW smps run correctly and full tested
The new version use a SG3525 and IR2110
And short circuits protected!
I finalize the schematics and PCB
I use a shielded transformer :
1. 1/2 Primary - 11 Turns
3. 1/2 Secondary - 8 Turns (for +/- 50V)
4. 1/2 Secondary - 8 Turns (for +/- 50V)
5. Copper Shield
6. 1/2 Primary - 11 Turns
And now i have 20mV noise at output.. is GOOD.
i post the final schematics and PCB tomorrow.
Sorry for long wait...
Now the 1kW smps run correctly and full tested
The new version use a SG3525 and IR2110
And short circuits protected!
I finalize the schematics and PCB
I use a shielded transformer :
1. 1/2 Primary - 11 Turns
3. 1/2 Secondary - 8 Turns (for +/- 50V)
4. 1/2 Secondary - 8 Turns (for +/- 50V)
5. Copper Shield
6. 1/2 Primary - 11 Turns
And now i have 20mV noise at output.. is GOOD.
i post the final schematics and PCB tomorrow.