12 Oct
2024
12 Oct
'24
8:54 p.m.
On 10/12/24 14:30, Paul Koning via cctalk wrote:
Years ago I commented (on this list, probably) that a
"VFC" would likely make a good 400 Hz supply. VFC is "Variable frequency
controller", a device that takes mains input and turns it into three phase output of
a frequency of your choice. The upper frequency is typically fairly low; I don't
think mine reaches 400 Hz but then again it cost me less than $100 for a unit that can
drive a 3 hp motor. That one takes either single or three phase (220 volt) input; larger
ones are normally specified as 3 phase only though chances are they would in fact work if
you fed them single phase power.
VFDs use IGBTs to create variable width square waves of
about 400 V. These can be turned into appropriate waveforms
with a filter, but you sure don't want to feed these
directly into any kind of computer power supply directly.
Jon