Is a PLL-synchronised SR SSTC possible?

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

Original poster: "Jolyon Vater Cox by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

I have drawn a diagram (below) for a self-resonant SSTC using a 
Phase-Locked Loop
to synchronise oscillation of the VCO to the resonant frequency of the 
secondary. What if any are the reasons why this topology will not work?

Assuming that it could be made to work would a normal or a quadrature phase 
detector need to be employed/would the LM567 Tone Decoder IC be of any use 
in this application?

Wouldn't the choice of quadrature or normal phase detector depend on type 
of feedback transducer used (eg pickup antenna, current transformer or 
current-sense resistor) and in the case of the current transformer or 
resistor, whether it was connected in series with the primary or the 
secondary windings?

Isn't the technique I have illustrated basically a matter of simpy 
frequency-modulating the oscillator to keep it in step with the resonant 
frequency?

NB:or reasons of simplicity in the diagram, I have shown only a SINGLE 
transistor output stage.

pickup antenna
       \|/
        |
  phase detector----low pass filter-+
        |                           |
        |                           |
        |                           |
        |         (-+-)             |
        |           |               |
        |   Vcc+   <                |
        |     |    <                |
        |  pri>    <sec             |
        |     >    <                |
        |     |    |               |
Contr. |   b /c    |               |
+--vco-+----|      |               |
|      O/P   \e    |               |
|            |     |               |
|            +-----+               |
|            gnd                   |
|                                  |
+----------------------------------+

Jolyon