[Amps] Re: Step-start calculation

[R.Measures]

On Nov 21, 2004, at 10:34 AM, Dennis12Amplify at aol.com wrote:

> In a message dated 11/20/04 11:47:47 AM Central Standard Time, 
> r at somis.org
> writes:
> I do not see how this computer app. could calculate inrush-I without
> knowing the mains ESR?
> ***Wouldn't you ALSO need to know the Inductance of both the primary 
> and the
> secondary windings and the coefficient of coupling between them?
>
With a Hipersil™ core, the coupling loss does not amount to much.

> *** I would guess that because of the large inductance associated with 
> the HV
> secondary winding, (which would be in series with the secondary 
> resistance
> and diodes when charging the caps), there could be a significant 
> counter EMF
> produced for any rapid changes in primary current, and that counter 
> EMF should
> greatly reduce the peak inrush current at turn on time.
>
> ***Regards,
>
> ***Dennis O.

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org