Jota (jotasbrane) wrote,
Jota
jotasbrane

Variable Voltage USB

I assume there is a very good reason that it would be impractical to design an extension to the USB standard that allows devices to use the data lines to request power that matches traditional in-home electrical outlets (e.g. 110V or 240V AC). Unfortunately, I do not know enough about USB to know why that is.

Is it just because most things that supply USB power can't easily supply high voltage or AC (since they're already operating off of their own power supplies which don't supply them with that kind of power)? Or is there some reason more intimately tied to how USB works?
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