There is way too much hand waving here. Draw a block diagram, and define your terms. We don't know what you think a "LVD domain" and a "PMSM inverter" are. And what is "1.000,00 uF" supposed to mean? Is that really 1 uF to absurd precision, or some screwup with commas and points?

That's a bit better, but brings up other questions. Why are there two different FETs back to back for the switch? Where is the load? You mention communications interfaces, but none are shown in the schematics. What's the point of the current sources (I1 and I2 in your schematics)? You also have a regular ground, and "COM_GND". What exactly are these connected to outside of these schematics?

Superior architecture: you don't need two series MOSFETs. What made you think you did?

@AndyAka The reason behind having two series MOSFETs is to prevent charging of the battery through the body diode when the FET is on.

@2kind - don't be silly - that only applies to an AC voltage source where the MOSFETs alternate at blocking. This is a DC application as in "battery".

"the FET is on" - I see what I wrote now - it should be "the FET is off". I wouldn't call this silly, especially when the load is motor.