How to create self oscilating SMPS

luka · 4th January 2007, 11:52 PM

Using only capacitors, diode, transistors,resistors...

No active components like chips,...

BWRX · 5th January 2007, 12:16 AM

Here's something I came up with a little while back - Fairly simple, relatively discrete switching regulator

If you make a discrete comparator that can current couple to the high side driver then you'd have a discrete self oscillating buck regulator, in theory and simulation. I haven't tried to build it yet.

luka · 5th January 2007, 12:20 AM

Nice design, but I do want it to be powered someday by 230Ac and I don't have a clue have to make a discrete comparator.

BWRX · 5th January 2007, 12:51 AM

So you're looking for an on-line design. I'd recommend against that unless you're well aware of what you're doing working with mains voltages.

luka · 5th January 2007, 07:54 AM

I have a lot of experience with halh-brdge by now and I have a broken smps, i thin it is a fly, mains power.It is/was 9v charger, bet fuse burned out, nothing other seems to be wrong. That fuse is in series with 230Ac. So in time fuse got smaller (not in size

) and blow at some point.

cerrem · 5th January 2007, 10:23 PM

You can try to use a "current-fed" Royer Converter with FETS...
Don't use the regular version it is prone to problems...

Chris

luka · 5th January 2007, 10:32 PM

The one I can find has FIN chip or something, so how would Royer Converter loke like with fets?

Sambal Oelek · 6th January 2007, 01:22 PM

try this:

Self-oscillating SMPS with saturable drive transformer

Gr. Sambal

luka · 6th January 2007, 02:58 PM

How did I missed this one

Thx for link

N-Channel · 7th January 2007, 06:11 AM

I barely rmemeber posting to to that thread and never saw it again until now. Hadn't set up preferences in my user profile yet, and never received notices of subsequent postings to the thread.

I will go to the ARRL website and re-download the 13.8V 40A SMPS article and shotgun it around as requested, starting with Luka.

Cheers everyone.

Steve

4th January 2007, 11:52 PM	#1
luka diyAudio Member Join Date: Sep 2005	How to create self oscilating SMPS Using only capacitors, diode, transistors,resistors... No active components like chips,...

5th January 2007, 12:16 AM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	Here's something I came up with a little while back - Fairly simple, relatively discrete switching regulator If you make a discrete comparator that can current couple to the high side driver then you'd have a discrete self oscillating buck regulator, in theory and simulation. I haven't tried to build it yet. __________________ Brian

5th January 2007, 12:51 AM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	So you're looking for an on-line design. I'd recommend against that unless you're well aware of what you're doing working with mains voltages. __________________ Brian

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5th January 2007, 12:20 AM	#3
luka diyAudio Member Join Date: Sep 2005	Nice design, but I do want it to be powered someday by 230Ac and I don't have a clue have to make a discrete comparator.

5th January 2007, 07:54 AM	#5
luka diyAudio Member Join Date: Sep 2005	I have a lot of experience with halh-brdge by now and I have a broken smps, i thin it is a fly, mains power.It is/was 9v charger, bet fuse burned out, nothing other seems to be wrong. That fuse is in series with 230Ac. So in time fuse got smaller (not in size ) and blow at some point.

5th January 2007, 10:23 PM	#6
cerrem diyAudio Member Join Date: Jun 2005 Location: San Diego, CA	You can try to use a "current-fed" Royer Converter with FETS... Don't use the regular version it is prone to problems... Chris

5th January 2007, 10:32 PM	#7
luka diyAudio Member Join Date: Sep 2005	The one I can find has FIN chip or something, so how would Royer Converter loke like with fets?

6th January 2007, 01:22 PM	#8
Sambal Oelek diyAudio Member Join Date: Dec 2006	try this: Self-oscillating SMPS with saturable drive transformer Gr. Sambal

6th January 2007, 02:58 PM	#9
luka diyAudio Member Join Date: Sep 2005	How did I missed this one Thx for link

7th January 2007, 06:11 AM	#10
N-Channel diyAudio Member Join Date: Mar 2003 Location: Sol System	I barely rmemeber posting to to that thread and never saw it again until now. Hadn't set up preferences in my user profile yet, and never received notices of subsequent postings to the thread. I will go to the ARRL website and re-download the 13.8V 40A SMPS article and shotgun it around as requested, starting with Luka. Cheers everyone. Steve

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