> The flyback converter is based on the buck-boost converter.

I don't know what the link said BUT the flyback topology came well 
before buck boost was thought of AFAIR.
Not that it really matters.
I see buck boost as a clever combination of just what its name 
suggests. Someone decided they could make a buck boost as well by 
switching both ends at once.

Note that a pure boost converter is fundamentally MORE efficient than 
a buck boost in boost mode.
This is because the boost converter output "stands on" the input rail 
and that part of the input is 100% efficient*. A buck-boost converter 
"stand on" ground and so it's whole output is affected by the 
efficiency of the energy converter. A boost converter efficiency 
approaches 100% as its output approaches the input voltage, subject to 
some losses. A buck-boost in boost mode does not have this same 
fundamental property.

* One of the very few things in engineering that can be claimed to be 
literally 100% efficient :-).



        Russell 

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