Hi,

I have been working through Erickson's book: fundamentals of power electronics (I know sacrilegious to mention here - ;-) )and I ran into the following, see attached document.

I was wondering if there is someone who could help me with understanding the difference between the canonical form I arrived at and the supposedly correct form from the book (page 5 in the document, last two equivalent circuits).

The difference between the circuits is minute: D*I*d(t) versus V/R*d(t) and probably have something to do with the transformer. My view is: If I would want to write the D*I*d(t) in terms of voltage and resistance I need to leave the factor D in place since this would disappear when I push the current source through the transformer to the other side. Yet, in the book it disappears, which I think means that if I push the current source to the other side during manipulations for transfer functions and the likes, I would introduce a factor 1/D when I do that.

Can someone explain, please?