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Design of SMPS - Not sure what these spikes are being caused by.

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Zog:
treez,
Something wrong with your latest Dual Boost ?
Only showing 210mW output ?



Zog:
I am an idiot.
No load in sim.
Just got back to working on it. shows 100W as advertised.

Zog:

--- Quote ---By the way, if you like, there is my free switch mode power supply course which explains a lot about SMPS's....
https://drive.google.com/open?id=0B7aRNbu3Fes4TU92Mkw3YlA3ams
--- End quote ---

WOW. So much information and a great course treez.
I was wondering on how to do so many things and having a skim through it I found many answers to my questions. Well done mate.

So many links to great resources. Spreadsheets and on and on and on. If you made it into a wiki I think you would be the number one resource for beginners like me.
I won't be asking so many questions now (I hope) that I have this little gem in my pocket.

I was wondering how to make the supply into a 25W one for instance and putting two or more in parallel to get more power if I need it and I now have the info I need.

Not found out how to lower the output to 25W yet though. But will keep digging, I am sure it's in there somewhere. Probably just mucking around in spice and selecting different components.

Layout is still my biggest hassle. I am still working on that, but there are lots of resources to calculate currents in tracks etc. So I might eventually get through that barrier.


--- Quote ---Here is also my guide to doing an electronics degree
https://massey276.wixsite.com/electronicsdegree
--- End quote ---

At 59 it's a little late for me. Particularly as maths is not my strongest point.

Cheers treez.

Zog:
Did not take long.
Another question.
In spice when looking at the current through L2 should I be selecting an appropriate inductor based on Average current or RMS.
I am presuming RMS correct ?

And that current should be less than the saturation current I am guessing.

edit: stupid question. should be RMS given the wave shape.
edit2: .. err.. shouldn't it ? :scared:

More editing:
Looking at this one for L2 in the tapped buck
https://www.digikey.com.au/product-detail/en/pulse-electronics-power/PE-54036SNL/553-1419-ND/1037030

MagicSmoker:

--- Quote from: Zog on August 30, 2019, 05:22:24 am ---...
In spice when looking at the current through L2 should I be selecting an appropriate inductor based on Average current or RMS.
...

--- End quote ---

Neither: it is the peak current that is most important in selecting the inductor, as that determines the energy handling requirement. RMS current is relevant only in selecting the wire diameter.

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