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Old 5th December 2005, 04:29 AM   #1
diyAudio Member
Join Date: Aug 2005
Default Give some suggestions for a SMPS newb?

Hi guys,

I recently wanted to look into making some simple switching supplies, just for kicks. What I have in mind, for now, is maybe something based on Philip's STARplug, a 12v, ~5A supply seen on most consumer electronic device line lumps. What I want to know is, what kind of sites and books should I be looking into for theory and operation, as well as some schemetics? I tried appealing to Google, but it just got mad at me and spewed a bunch of stuff I can't understand. Is there maybe some FAQs or Wiki's floating around on SMPS that could start me off gently? I'm not too lazy to read, I just want to know what to read.

Thanks a bunch!
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Old 5th December 2005, 08:45 AM   #2
Join Date: Jan 2005
Try this: http://schmidt-walter.fbe.fh-darmsta..._e/smps_e.html
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Old 5th December 2005, 09:16 AM   #3
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Join Date: Aug 2005
It looks like none of the designs on that website has feedback controls to regulate voltage...

Are those supposed to be unregulated designs?
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Old 6th December 2005, 09:46 AM   #4
Join Date: Jan 2005
No, its to calculate the core size according to the current and voltage out you want for a spesific input voltage and current.

For voltage refulation you use a vfb curcuit with 2-3 resistors and a pot, or some componentes and a optocoupler.

Take a look at how its done in these schematics:

Click the image to open in full size. Click the image to open in full size.
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