TopRuslan

[apecore]

So anybody tried the configuration with tuning method as described by RuslanT?


http://matri-x.ru/forum/index.php/topic/1769-%d0%b3%d0%b5%d0%bd%d0%b5%d1%80%d0%b0%d1%82%d0%be%d1%80-%d1%80%d1%83%d1%81%d0%bb%d0%b0%d0%bd%d0%b0-%d0%ba%d1%83%d0%bb%d0%b0%d0%b1%d1%83%d1%85%d0%be%d0%b2%d0%b0/#entry260606

[apecore]

I think I would want to know how I can phase lock a device to a tl494 input and not the other way round (sampling it's outputs). A CD4046 and dividers can be a pain in the arse Re Igorik device on OUR.

So what exactly are you looking for?
I'm running PLL with actif 2nd order lowpass filter.
Going directly to kacher primairy mosfet.
Stil busy optimalisation in order to get a bandwidth of +/- 100khz within offset frequency.

According Ruslan as stated in 2016 (see previous link) inductor frequency can be any integer from grenade/ kacher frequency.
With fine tuning in 10th of kiloherz to determine dancing sinewaves at approx Fres grenade.
So that means no fixed frequency divider for Pushpull.
In other words for stability PLL is needed for inductor loop also.

Or  maybe i m wrong... he pulses inductor ttough yoke  with square pulses.. so no seriescap?
When i do puls inductor with spprox 40khz I get 2kV spikes on inductor.
Which are 600ns width.... this is wider as a half wave from kacher..(250ns)

Problem is when I translate the text it is not a consistent story.
If smebody has a better explanation about wich coil does what and how he tunes inductor coil?
That would be welvome

[AlienGrey]

Have you got a scope shot of your katcher drive wave form showing a wave form shot and the active
section of push pull section as well.   It should full of bemf pulses i would expect. Is it?

Sil

[apecore]

I've used the CD74HCT4046 many times.  It's a nice little chip,
but like anything else, it has some tuning required to get it to
track a source signal and if you tune it too tight, it will jump
out of lock and go off scanning for anything else.

My experience with the 4046 is that your input signal must be stable.
In my opinion lock range for kacher should be max +-100khz.

[quote author=Dog-One link=topic=19422.msg575959#msg575959 date=1680204674
In the case of this device, we can use this PLL as a multiplier.
Apecore suggests going after an odd subharmonic, so it is
quite doable to take the grenade resonant frequency and
produce a Tesla frequency.
[/quote]

This idea is out of scope regarding Ruslan stating "we need to tune outside of the max V region, searching for the wave strarts to dance". ...this is not @ resonance i assume.. or at least in a fixed small value next to it


[/quote]

[quote author=Dog-One link=topic=19422.msg575959#msg575959 date=1680204674
We can also go the other way around and use the PLL to lock
to the Tesla frequency, divide by an odd subharmonic and drive
the push-pull with that.  It all really depends on which frequency
is the more critical one.
[/quote]

Yes we need the kacher to run at grenade resonance, taken in account Ruslan's comment .. this must be done with PLL.

But for Pushpull frequency we need to adjust a sub harmonic at a level of 1khz.( tune by 1/10  of a khz) looking for the wave to dance.(Fpp)
So this will not be a fixed sub harmonic from kacher.
I think and if not please comment, we take a SG3525 sychronise it with the 4046 and let it drive the PP on a fixed frequency.(Fpp)
Open issue for me is ..Push pull is it sinewave or square.
We all tried sinewave... did not work.
Synchronisation both VCO's is essential and easy using SG3525.
Lets try push-pull w/o seriescap.

[NickZ]

🤝 Apecore:  What you are looking for now, is what all of us here need to know. But, no one does know. And is why we need to get to the bottom of this.
   I followed the directions from Stalker, as I have more faith in his approach.  Vasik offered a lot of information about that, but still neither Itsu myself nor anyone else here has had any success, at all.  Someone who has never built this device, will have no idea about how to go about tuning it. Nor how it really works, and why.   Ruslan has mentioned about the use of a tuning method using a small current transformer to tune the Kacher to the grenade circuits with. T-1000 explained to me how to use it. If interested I can explain it to you, if you don't already know.
    NickZ