There are generic power supplies available (but not in core parts because I have been lazy!) It is however quite a bit simpler than this unit (there are three of these for different versions that people have requested)
this one is generic-ac-power-supply.fzpz there are also
generic-ac-power-supply-2.fzpz
and
generic-ac-power-supply-3.fzpz
which a search in the forum search bar should find as the parts were posted to parts submit. I’m open to making a unit like this when I figure out what @fai needs in terms of the simulator (since I can probably make the part much easier than him.) Since you asked for it you are likely to get your image 
.
Peter