Re: [TCML] PFC Question (again)

[David Dean <deano@xxxxxxxxxxxxxxxx>]

Hi Bart

I do not mean to leave you hanging, but after giving much thought, have found 
myself unable to express my opinions on the subject in just a few words. A 
few pictures perhaps. May take some time. Will advise when I have something 
presentable. 

later

deano

On Tuesday 20 May 2008 09:07:23 pm bartb wrote:
> Hi Deano,
>
> David Dean wrote:
> > Question - can anyone explain these effects
> >
> >
> > Power factor correction is about resonance. If the current drawn from the
> > supply was decreasing, that can only mean that the circulating current in
> > the rest of the circuit had to be increasing. When it started to issue
> > sparks, that was a load which threw things back out of balance.
>
> Back out of balance? Please explain.
>
> >> and should I
> >> only parallel the PFC with the input of the PT only and not
> >> the main input to the PT and its ballast?
> >
> > Absolutely not. It is the inductance of the ballast that is working
> > with?/against? the PFC cap to reduce the current drawn from the source.
>
> This is the first I have heard of not connecting the PFC's directly
> across the low voltage mains. Please explain in more detail why not.
> This is the only connection I've heard about on the TCML over the years
> and here you are saying not to do that. Is not the inductance of the
> ballast felt across the transformer?
>
> You sound like your very knowledgeable in this area and I would really
> like to understand more about power factor correction. It's been a goofy
> subject on the TCML over the years and none of us I guess are very well
> experienced in this area.
>
> Take care,
> Bart
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