I have a 3 phase 400Vac supply rectified to 540VDC.
A full bridge phase shift converter converts the 540VDC @10A to 10Vdc @500A.
I try to figure out a power factor correction frontend for this converter.
The main question is : Buck or Boost?
I tend to use the buck topology rather than the populated Boost
My Reasons for Buck Topolgy:
-No Inrush current. (soft start is possible)
-Possiblity to step down the 540VDC to 320VDC so that the phase shift converter design will be simpler and cheaper. Semiconductor Voltage rating is 600V instead 1200V which saves cost.
There is also a possiblity that I convert 540VDC to 50VDC through the Power factor correction converter. The semiconductor Voltage rating reduces to 100V instead of 1200V which gives me the possibility to reduce semiconductor cost and increase the frequency and reduce system volume.
Any recommendation between Option 1 and Option 2 , Or maybe some remarks for Boost Topolgy? (Boost topolgy has some drawbacks in my case. The Bus voltage must be 40-50V greater than 540VDC bus which makes the design and implementation harder and cost of the semiconductors increases. The inrush current is also a problem for boost topolgy which needs extra effort and circuit and increase costs.
Thanks for your input.