[Amps] Tuned power transformer

[Angel Vilaseca]

Dear Bill,

Tnx for your answer.

So let's try to guess what happens if I remove the capacitor... There is no
parallel resonant circuit any more, so the power line "sees" a much lower
impedance, so the core will saturate on the whole AC cycle and the primary
should go up in smoke even without a load on the secondary?

Am I right?

Vy 73 de Angel Vilaseca HB9SLV

Bill Turner wrote:

> On Tue, 18 May 2004 10:38:59 +0200, Angel Vilaseca wrote:
>
> >So I guess that this must be a tuned-primary power trnsformer. I never
> >saw this before. How does this work? What are the properties of a
> >tuned-primary power transformer? Does it prevent current inrush at
> >power-on like a tuned choke?
>
> _________________________________________________________
>
> Zenith used this technique for years in their color TV sets back in the
> '70s.  It is a parallel resonant circuit which is carefully designed to
> make the core go into saturation at the peak of each AC cycle, thus
> providing a measure of voltage regulation to the secondary.  It worked
> reasonably well, although other TV manufacturers never adopted it as far
> as I remember.
>
> Since it is foreign-made apparently, be sure it is designed for 60 Hz
> and not 50, else trouble is sure to ensue.
>
> --
> Bill, W6WRT
> QSLs via LoTW