16F676 based SMPS design

sahu77 · Joined: 08 Sep 2011 Posts: 202

Please guide me about PIC 16F676 based SMPS design up to 10 amp.
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sahu

temtronic · Posted: Fri Oct 21, 2011 11:16 am

Google ??
Honestly, you need to supply a LOT more information ! 10 Amps ? At what voltage level(2V,12V,5V,120V), AC or DC ,frequency for the SMPS ? 120 HZ,24HZ,2400 HZ,10,000 HZ ???? Percent regulation, temperature range,
The list goes on and on....

I can do it exactly what you ask for in about 10 lines of code....
..now what you NEED is another story!

sahu77 · Joined: 08 Sep 2011 Posts: 202

temtronic · Posted: Fri Oct 21, 2011 12:15 pm

If you have very little experience in designing 300 Watt, offline SMPS systems, I suggest the easiest way would be to use a typical 'PC tower PSU'. Hack into it, remove the smps chip,read up on how it works, then program a PIC to do the same thing.
There is tons of info about PC power supplies on the net and all the hard work( magnetics,transformer design, line isolation, secondary considerations, layout,etc.) has been done. Buy 3 or 4 IDENTICAl units as you'll probably blow 3 of them up unless you're very,very good at understanding how they work.
It's a whole lot cheaper than trying to 'start from scratch'.SMPS is part science,part black magic.
You can get a 24VDC, 10 Amp SMPS from a typical PC power supply.You'll need to cut,hack,modify and burn a few PICs but it can be done.

sahu77 · Joined: 08 Sep 2011 Posts: 202

temtronic · Posted: Fri Oct 21, 2011 2:03 pm

I understand...
What I suggested was for you to replace the analog chip in the PC supply with a PIC that mimics the logic and control of that chip.
It's a quick, dirt cheap way to design and build SMPS of moderate power requirements.
I did it 10-12 years ago using a PIC16C84 for a remote control power project, took about a week after I read how the PC PSU chip worked.