I have a (750w) psu that takes up to 60vdc and would like to plug it in a 230vac 50Hz (domestic power outlet).
There are two solutions I thought of immediately, but am not sure which one is best :
1 : 230Vac -> transformer to 60Vac -> rectifier bridge -> bank of capacitor -> DCDC psu
2 : 230Vac -> rectifier bridge -> switching regulator -> bank of capacitor -> DCDC psu
1-> Rare and expensive transformer needed
2-> complex circuitry needed to switch the gate of a mosfet (to drop voltage down to 60vdc).
Of course the easiest would be to buy the converter but it's pretty difficult and the challenge could be interesting :)
(NB. I didn't take into calculation the rms, and other voltage drops for all of these values, the DCDC psu handles up to 50V 15A, I'd like to get the most out of it :) )