[TCML] A single-resonant s.s. input ckt

[Ken or Doris Herrick <kchdlh@xxxxxxxxx>]

Greetings all-

For general interest, I've put up a simulation-schematic + waveforms for 
my in-progress new input circuit, at http://drop.io/kch_ring_brg.  (Also 
shown is my previous s.s.t.c. when it was in operation--now, hopefully, 
to be resuscitated.)  Click once on an image to enlarge it--& sorry for 
the fuzziness.

This will be--as was the original one--a single-resonant t.c. with 
feedback taken from the secondary return.  This ckt processes that 
return-signal.  I'm almost done with the building of the whole thing, 
using the secondary & toroid I had before.

At the left in the ckt is simulation of the secondary, at the point 
where it has just developed 5KV of voltage.  It's delayed 100 us in the 
simulation to show the onset of feedback.  Other simulation of the whole 
ckt indicates that I will need a 90 deg. phase-shift (as I did in the 
previous one), which is effected in this simulation by C3.

The logic ckts are isolated from earth gnd by TX1, and the "pilot 
oscillator" is included to get the feedback going (for that 5 KV).  
Notice, in the waveform dwg, that feedback commences ~25 us after 
appearance of the 5 KV, very nicely entraining the U2-gate output in 
sync with the secondary voltage and swamping out the pilot-oscillator's 
input.  In the real ckt, I include a MOV across TX1's primary to limit 
the voltage there to 25 or so.

Ken Herrick


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