Hi Russell,
I will have a look at 100KHz, it makes sense. I have now to look at
inductor selection which seems a bit confusing. You are right I should
probably start with a lower power version.
I generally looked at the continuous mode design, as discontinuous
seemed to be harder on the components in the circuit but I will look at
it again.
You are right about the equations, it took me a while to get my head
around them, but when you do it seems simple (deluded).
As I am really interested on the power side of things and the design
process of it, I have not looked into the control IC yet, I may try it
with a PIC.
Thanks for your comments.
Best Regards
             Luis 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Apptech
Sent: 05 December 2009 09:59
To: Microcontroller discussion list - Public.
Subject: Re: [EE]:: Boost Converter

Luis

I wasn't at all annoyed.
Just suggesting that knowing how the components behave is fundmental to
all 
that follows.
You now seem to have mostly made the jump to light speed :-).

10 kHz is VERY low for a modern converter.
Only run there if there is special need.
Core will be much larger than usually needed.
100 kHz is a sensible modern minimum.
Using a powdered iron core from eg Micrometals (Gargoyle knows) would be

cheap and tolerably good. Beware of clone limitations of Micrometals 
products.  All nominally equally specd powdered cores are not created
equal.

Continuous mode is generally better - but the equations end up
surprisingly 
complex - not hard or inobvious - just with many terms.,

For lossless approximation the duty cycle is essentially in the inverse 
ratio of Vin and Vout.

Skimming your design procedure it looks OK enough (E&OE YMMV ...)

Building a somewhat lower powered version to start is probably wise. ~60

Watt's is enough to get good magic smoke when things gang aglae.

What controller IC do you intend to use?


          Russell 

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