Suppose I have something like 50 independent switching regulators all tied a single load and ideally sharing current. I could provide isolation for each regulator using a diode.
simulate this circuit – Schematic created using CircuitLab
Or I could provide GND isolation using a transformer.
For such a large number of power supplies in parallel, is there a risk of having massive GND noise on the shared GND plane from all the switching components? Would GND isolation help address this issue? If GND isolation is not required, what design considerations should be taken into account when sharing the GND?