AC/AC Converter Design
AC/AC Converter Design
(OP)
I am trying to generate 1000Hz, 3-phase, 36Volt RMS, 200W total power system from 60Hz single phase line.
Motor-generator or commercial solution not practical (expense). We would like this power supply to operate over the range from 60Hz-1000Hz, so transformer designs are probably out as well.
One solution I had considered was to rectify & filter the 120VAC 60Hz, use a buck converter to reduce the voltage to +-50(ish)V supplies, then use 3 inverters and filters to generate the 3 phases at 36V RMS.
Anybody have any suggestions/comments? Thanks in advance...
Motor-generator or commercial solution not practical (expense). We would like this power supply to operate over the range from 60Hz-1000Hz, so transformer designs are probably out as well.
One solution I had considered was to rectify & filter the 120VAC 60Hz, use a buck converter to reduce the voltage to +-50(ish)V supplies, then use 3 inverters and filters to generate the 3 phases at 36V RMS.
Anybody have any suggestions/comments? Thanks in advance...






RE: AC/AC Converter Design
The first question is. Are you building only one of these, are will it be a production item?
The approach will be different depending on how many you plan to build.
+50(ish)V power supplies seems kinda low. Peak to peak Ac voltage is 2X36X2^0.5=102 volt.
RE: AC/AC Converter Design
One suggestion would be to get an AC drive and HACK the dickens out of it... All the semiconductors would have the screwy drive systems, current and voltage ratings, and heat sinking you'd need already. Plus the three phasidness covered. :)
RE: AC/AC Converter Design
Thanks for the AC drive suggestion itsmoked. Unfortunately we don't use a lot of motors so we don't have any AC drives laying around.
I'm still considering the idea I had before, except I'm now looking at SEPIC converters rather than buck, as they are a little easier to control (since the FET is ref'd to ground rather than floating).
Still open to suggestions if anyone has them...thanks...
RE: AC/AC Converter Design
Otherwise I would use a variable frequency motor speed controller, which will give 3-phase out and follow it with a transformer to 36V. Transformers using ferrite or audio grade core material will operate over this frequency range.
RE: AC/AC Converter Design
RE: AC/AC Converter Design
RE: AC/AC Converter Design