RE: New pics and scope waveforms

To: tesla-at-pupman-dot-com
Subject: RE: New pics and scope waveforms
From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Wed, 15 Dec 1999 18:13:01 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

??

> Original Poster: Dale Hall <Dale.Hall-at-trw-dot-com> 
> 
> Richie,
> Verrry nice presentation. Great work. Thanks for the effort.
> 
> One befuddlement:
> The Secondary is referred to as being parallel resonant.
> At parallel resonance, voltage is minimum across LC 
>   and minimum current is sourced from a parallel generator.

Voltage is minimum across a parallel tuned circuit at resonance?? 
The front end of most radio sets includes such a circuit to present a 
minimum load to the incoming signal at Fo isn't it?
 
> In a classic TC, Primary energy and its loss resistance
>   is coupled as a low impedance series generator into the Secondary,
>   effecting a Series Resonant condition.
>   The generator current is maximum (requiring a low Z source),
>    limited by Rdc_inductor+SeriesEquivCoupledPri&ArcLoad,
>    the LC junction (top of Sec) voltage is maximum at resonance.

One might also see the secondary as a parallel circuit (an inductor 
in parallel with its distributed capacitance) mightn't one?  How does 
one classify the primary - series or parallel?  The truth is that both 
types exhibit a current maximum and a voltage maximum across 
their individual components at resonance. 

>    Discharges represent resistance in parallel with both Sec L & C,
>    that can be represented as an equivalent Sec series resistance.
> 
> Comment ?  

Agree with the last statement.

> Am I confused ? perhaps series=parallel depending on how viewed ?
> 
> The Primary LC is parallel resonance since energy is provided
>   in parallel from precharged Pri Cap prior to a brief switch closure
>   to transfer stored energy.
>   When the switch is open the generator charges the Cap in 
>   a dormant, not part of the resonant period, isolating its losses (?).
> 
> Perhaps the confusion is due to the impulse excitation of TC's Vs continuous
>  nature of the generator (signal source) so a comparison loses meaning ?

Actually, the secondary is more driven at Fr than by an impulse, 
albeit a decrementing wavetrain by virtue of losses and finite circuit 
energy from the primary cap.

Regards,
Malcolm 
<snip>