SMPS need more power

opor · 6th January 2010, 02:52 PM

I need 1.2Kw SMPS .And this schematic is interesting .So how to modify this schematic to get more power?

Andrew Eckhardt · 6th January 2010, 03:13 PM

go to 90 kHz and make sure everything stays cool

opor · 6th January 2010, 11:21 PM

how?

Andrew Eckhardt · 12:25 AM

The values at rt and ct set the osc frequency. Drop some turns on the transformer, You'll probably have to change the current limit circuit values. Put a bigger mains fuse in, put your goggles on, and get ready with the fire extinguisher.

star882 · 7th January 2010, 12:37 AM

Build two of those power supplies with a shared feedback circuit.

Andrew Eckhardt · 7th January 2010, 12:57 AM

If you built two you could just configure them as isolated single ended supplies.

star882 · 7th January 2010, 02:01 AM

Quote:

Originally Posted by Andrew Eckhardt

If you built two you could just configure them as isolated single ended supplies.

That would cause unequal load sharing if one rail is loaded more than the other.

If you built two that are run in parallel, you could stagger the clocks by 90 degrees and double the effective operating frequency without changing the actual operating frequency.

luka · 7th January 2010, 08:51 AM

with that core, you don't need to go above 50k for that little power, 49 would do it easy, and my 44 already did it...

opor · 19th January 2010, 02:56 PM

Luka

If I use ETD49 how many turns I have to do to reach my target?

luka · 19th January 2010, 06:30 PM

power is not turns dependent

7th January 2010, 12:20 AM	#4
Andrew Eckhardt diyAudio Member Join Date: Nov 2005 Location: PA	The values at rt and ct set the osc frequency. Drop some turns on the transformer, You'll probably have to change the current limit circuit values. Put a bigger mains fuse in, put your goggles on, and get ready with the fire extinguisher. Last edited by Andrew Eckhardt; 7th January 2010 at 12:25 AM.

7th January 2010, 12:37 AM	#5
star882 diyAudio Member Join Date: Mar 2007	Build two of those power supplies with a shared feedback circuit. __________________ "Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!

19th January 2010, 06:30 PM	#10
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	power is not turns dependent __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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6th January 2010, 03:13 PM	#2
Andrew Eckhardt diyAudio Member Join Date: Nov 2005 Location: PA	go to 90 kHz and make sure everything stays cool

6th January 2010, 11:21 PM	#3
opor diyAudio Member Join Date: Nov 2005	how?

7th January 2010, 12:57 AM	#6
Andrew Eckhardt diyAudio Member Join Date: Nov 2005 Location: PA	If you built two you could just configure them as isolated single ended supplies.

7th January 2010, 08:51 AM	#8
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	with that core, you don't need to go above 50k for that little power, 49 would do it easy, and my 44 already did it...

19th January 2010, 02:56 PM	#9
opor diyAudio Member Join Date: Nov 2005	Luka If I use ETD49 how many turns I have to do to reach my target?

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