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
