> aren't these boxes basically fancy three phase outlets?
That entirely depends LOL
So for AC chargers you are correct - 1 or 3 phases that go through a relay and, where required by code such as in Germany, a DC-sensitive RCBO, plus a small control board negotiating with the vehicle and monitoring voltage/current on one side and, again depending on where required by code, negotiating with the grid operator.
DC chargers are one hell of another beast, these have to contain all of the above plus powerful rectifiers, smoothing capacitors, EMI compliance...
That entirely depends LOL
So for AC chargers you are correct - 1 or 3 phases that go through a relay and, where required by code such as in Germany, a DC-sensitive RCBO, plus a small control board negotiating with the vehicle and monitoring voltage/current on one side and, again depending on where required by code, negotiating with the grid operator.
DC chargers are one hell of another beast, these have to contain all of the above plus powerful rectifiers, smoothing capacitors, EMI compliance...