Re: phase locked loop SSTC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steve Greenfield by way of Terry Fritz <twftesla-at-qwest-dot-net>" <alienrelics-at-yahoo-dot-com>

This thread should be renamed. ;')

Have you considered using an actual PLL? It'd take
some work to make sure no HiV gets through to fry
everything. Optical coupling, so the only thing that
gets fried is a few components?

Using an actual PLL, you might be able to reach your
goal of a "PnP" solution. I'm very interested in your
results.

Steve Greenfield

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "John Tomacic by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <tesla_ownz_u-at-hotmail-dot-com>
> 
> Hi Paul,
> Your question made me rethink the problem through
> and I realized that I made 
> an assumption which may not always be true. I always
> operate my coil just 
> below resonance or at resonance, so an increase in
> current amplitude would 
> mean that the comparator would drive the VCO input
> voltage lower, lowering 
> the frequency to compensate for the increase in
> current.  However, if the 
> VCO frequency is driven higher than the resonant
> frequency, the current 
> signal will decrease, not increase, causing the lack
> of direction problem 
> you mentioned.  In this situation the phase reversal
> associated with the 
> transition from capacitive reactance to inductive
> reactance could be used as 
> a direction signal (via the D FF Malcolm mentioned).
>  Sorry for the 
> confusion, I guess I spoke too soon (not the first
> time, or last!)


__________________________________________________
Do You Yahoo!?
Send your FREE holiday greetings online!
http://greetings.yahoo-dot-com