phase converters for big iron
pkoning at equallogic.com
Thu Apr 28 18:43:38 CDT 2005
>>>>> "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.
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