[Amps] Power factor correction

[Bill Fuqua]

  "passive inductive correction on a rectifier/capacitor input system "
   Does that make it an inductive input filter system?
Let's see. if the inductor is between the rectifier and the
capacitor that makes it an inductive input filter.
   Is there more information on how they do this?
It seems that if you put an inductor on the AC side of things, even
on DC side, you would have less output from capacitive input filter.
Something is missing here.
    You could improve the power factor by placing a low pass filter between
AC power line and power supply, thus no harmonic current on AC power line.
However, there are trade offs in doing that.
73
Bill wa4lav





At 10:42 PM 3/12/2013 +0000, Steve Thompson wrote:
>jeff, wa1hco wrote:
> >Using a power factor correction cap works when the load is a bunch of 
> inductive motors. But it >won't really work for the pulse type load from 
> a capacitor input filter.
>
>My first reaction would be to agree with you, but researching PSUs for
>a quote the Vicor 4kW Megapak was in the frame - that uses passive
>inductive correction on a rectifier/capacitor input system and claims
>0.92 PF in the spec. OK, that's a bit lower than the 0.95+ that active
>circuits manage, but there's a trade off against complexity and
>reliability.
>
>Steve
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