Re: PFC Question

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Dmitry,

YES, the mains see the variac inductance that is in parallel with the 
load. This inductance is very high however.  What I was trying to 
say, was when variac_out = variac_in, the wiper is at the power in 
point on the toroid so there are no toroid turns in series with the 
load for this case.  Hope that is clearer.

Gerry R

> Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>
>
> > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> > PFC caps can also be placed upstream of the variac as well to correct > for
> > the inductance added by the variac itself.  However, the variac
> > inductance will be a function of the variac setting (zero inductance
> > when variac_out = variac_in)
>
> it`s wrong - when "variac_out = variac_in" the coil "sees" zero
> inductance from the mains side, but the mains "sees" the full variac
> inductance.