[kccqzy]

The expensive power electronics you speak of are not part of the dispenser. The dispenser is really just a very fancy switch. It performs some payment authorization and then switches on those expensive power electronics.

If you look at a modern Electrify America unit, the dispenser is an extremely slim panel with a screen. It clearly isn't big enough to contain these power electronics.

Now transformer isn't a great name because it implies an AC-to-AC device which this is not. So I can see where the confusion comes from.

[Kirby64]

I’m not confused here, to be clear. There is a giant transformer that converts from mid voltage AC to low voltage AC at most installations. Because they draw so much power they need their own dedicated transformers. There’s sometimes (depending on the installation) a separate cabinet to convert the AC to DC and then transfers it to dispensers, though, as you say. The more modern high power ones tend to use separate cabinets, I’d agree. Older ones could take 3-phase AC directly since they’re much lower power overall.

[vel0city]

Those older ones were just normal step-down transformers. In Europe that would often be three-phase, in the US it would normally be two-phase (J-1772 is only two-phase compatible). In that world, the "charger" (EVSE) was just a smart relay which would tell the car how much power the circuit would handle, but the actual charger was a thing in the car. That's commonly called Level 2 charging.

What is commonly talked about here are DC fast chargers, where the actual "charger" is an AC to DC cabinet on-site. Those chargers could be connected to one or many dispensers. The dispensers are the things with the cables that plug into the car, handle payment negotiation, and relay battery state to the charger in the cabinet. You could have multiple dispensers to chargers in this setup.

The technical English parlance here would be EVSE for the Level 2 chargers (the smart relay things), and dispensers for the pedestals with the cables for DC fast chargers (DCFCs).

[Kirby64]

Again, not confused here. I’m talking about older stuff like the 50kW CCS/chademo systems. There’s no “older” with standard level 2 charging. Level 2 charging coexists with level 3 and will continue to coexist.

[cyberax]

That's because the power electrics are in a big white cabinet on the side.

DCFC electrics are absolutely insane.