I am absolutely in awe to the welth of information found here. If I may? I am working on a similar power supply, with similar requirements as the origional poster save the 60hz final output. The supply I am working on will be directly controlling the current with little focus on the actual voltage.
The Basics, 208Vac 3phase or 220Vac single phase input rectified and filtered. I would like to use a bank of mosfets at a switching frequency around
200-250 Khz Or another possibility would be a large IGBT at around 10-12 Khz. Drive and controll considerations asside, I am looking for 2% or less of THD if possible output current will average 20-35A with a sustained 50A possible. The output voltage will be anywhere from 95V to as much as 160V DC. The full voltage of the rectified mains will be on the output untill the sustained arc is started and at which point the current regulation will be put to work. The voltage will vary and that is expected but the current must stay stable. I have a pretty good design on the controlls and feedback, But... My question is weather to use a bank of mosfets with there own LC network each, such as 5 or 6 in parallel with all outputs tied together, or1 bank of mosfets\\IGBT and a single filter?Much Thanks Cory