Grin.. sure... the ascii is a current boost and the first dropbox scribble is a current buck. I'm not sure what you mean about the ascii drawing... It's being fed from a current source.. so how can it be a 'standard buck'. (The output is also a (DC) current.. so I can't really put a capacitor there.)
You should also note that the ascii has a current source feeding right into a capacitor! (But that really does seem analogous to the voltage boost where the voltage source feeds an inductor... both will 'rail out' if not part of the switching scheme.)
I'm having a lot of fun in my smps course. Maybe I'll have to build one someday and 'really' learn something :^) I've often thought there might be a niche vacation market for geeks. Instead of going to the the ocean or mountains, you go to 'school' and intensely learn a new subject. When I was at the FEL in Vanderbilt I went to "accelerator school"
George H.