I'm struggling with the concept of floating voltages.
For a grounded supply I can connect one side to an effectively infinite ground and get full power. It may vary depending on its construction, but if the grounded supply provides X volts then it is necessarily true that:
[A] (V+ to G) - (V- to G) = X, correct?
Now suppose I want to "ground" a floating supply. My understanding is that the supply's V+ and V- separated behavior with respect to some "ground" of practically infinite capacitance must be characterized by the source of the voltage:
- A floating driven power supply cannot send power through a path that does not directly connect its V+ and V- terminals, as roughly explained here.
- A chemical power supply, like most conventional batteries, cannot send power that doesn't connect its V+ and V- terminals, because the driving chemical reaction will not occur without electron transport exactly matching the needs on both terminals simultaneously.
- But a capacitor should be able to send power from either its V+ or V- terminals, right? It depends on the charge of the G, but not only does the relationship [A] above hold, but also the capacitor can dump all of its power into an arbitrary ground if V+ and V- are independently and separately connected to that ground. I.e., there is no such thing as a "floating" capacitor?
(Evidently I'm assuming that a "floating" supply is defined to be one in which power only flows between V+ and V-. Is that accurate? And are there any other "floating" power supply categories than #1 and #2.)