handyandy, the RVIC is basically 3 VIC's in one, each phase can be thought of as a VIC, when I said it has a 50% duty cycle from the rectified AC I was saying this in the context of a single phase. Each phase then connects together into a single wire after the isolation diodes, but the secondary, chokes, and blocking diodes of each phase all act individually before the phases merge.
Each phase is individually half wave rectified by the blocking diode, therefore 50% duty cycle DC,
Then, the isolation diode combines the three phases into one wire, and one wave form, without allowing them to interact with each other backwards through the same wires on the stator.
The only interaction from the three phases on the stator is mutual inductance. You can read on the first page of this topic what I wrote about the mutual inductance of the three phases, I'll spend more time on this later, when I have a scope hooked up, which will provide a much more valuable insight to the function of the RVIC.