phase converters for big iron

[Paul Koning]

>>>>> "jim" == jim stephens <jwstephens at msm.umr.edu> writes:

 jim> Paul Koning wrote:

 >> >>>>> "Simon" == Simon Fryer <fryers at gmail.com> writes:
 >> 
 Simon> All, On 4/27/05, Kevin Handy <kth at srv.net> wrote:
 >> <chomp chomp>
 >> 
 Simon> The PWM works pretty well for induction motors. I would expect
 Simon> big iron to have some issues.
 >> Why?  I would expect power supplies to be every bit as tolerand of
 >> distorted waveforms as motors are, even assuming that these
 >> converters produce major distortion.
 >> 

 jim> The problem will be that some devices work well if they have a
 jim> large amount of inductance in their power supplies, such as
 jim> conventional power supplies will have.

 jim> If they are switcher power supplies, they tend not to react very
 jim> nicely to having a solid state inverter feed them.

I don't believe that.

Without PFC, a switcher begins with a full wave rectifier.  If you
feed a square wave into that, it will be happier than it was with a
sine wave, not less happy.

With PFC, the analysis requires more knowledge than I have.

    paul