I am working on a fairly small motor controller (2kW). The power input is AC 110-220VAC, so there is a PFC stage that boosts the initial DC voltage to 390VDC. After this stage, I require a 160-165VDC stage for brushless DC motor commutation. PFC and commutation are not a problem.
I have been looking at manufacturers online and they seem to be low on high output voltage controllers (input range as well..)
What is a viable and efficient buck stage for this circuit?
My current thought process is down a path of using a lower voltage, synchronous buck, controller chip and isolating the chip from the input/output via a low power DC supply and external gate drivers. That all seems very complicated...
What ideas do you have stack??