Stan Resonance finally cracked! by Sebosfato

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I just bought a $40 stm32 controller with touch screen and GUI on ebay to move beyond the timers for switching.  I started to do this meyer thing a couple of years ago to learn simple electronics components and now want to move up so to speak.  I'm starting to think that very fine and stable control of the switching circuit is quite important.

Nice, I use a STM32-103STK for Pulse and Gate signals.
Would be great to implement a SPLL (software PLL 4046 chip) 

br,
Webmug

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I don't really think is needed to start with this, is very basic and simple the electronics that we need for making the resonant scanning circuit, the feedback and to tune the pll if analogical... Just need some practice...


We should simplify.


But if you're sure hope it works well for you guys..

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Sebo, Webmug,   I'll be learning the stm32 as I play with timers.  It was so cheap for a cool computer on a chip that I couldn't refuse.

fyi...

I just put an ultrafast diode between the mosfet driver and the mosfet gate and have eliminated the signal feedback and produced a nice clean square wave without interaction with the HV pulses.  should have thought of this before....  really cleaned things up

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But how can the mosfet driver discharge the gate of the mosfet with the diode there between?

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I found more issues in my pulsing circuit that tried to solve, one of them was the some fast connectors to change the capacitance easily, it was not soldered anymore, bad idea, so i just soldered two pieces of wire and soldered the capacitor i built for the pll 350pf made of polipropilene, i made it and work very well... =)


I now have the hope that adding that coil in the circuit i will achieve the resonance i want...


I will have two chokes in that variable gap core style, one made of 28awg and the other made of 24awg The last will be in series with tx5 and the other in series with tx4, i will also have tx3 in this separated core, witch will be my feedback coil. 

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hello sebosfato
 
i've been following this topic since you started it. I really like your theory and I cant stop thinking about it. I Have a few questions, How would you propose the circuit resonantes? basicly i'm asking which chokes would resonate with which capacitor?
I did some simulations and it seems like the circuit would resonante on the negative side if there is also a ground before the negative choke as stan shows in his circuits. Thanks for all the info so far. I hope to here of your results soon.
 
Dave

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Helo Dave,



When stan showed the two coils being one adjustable and the other not adjustable, and called both resonant charging chokes, but one of them he also called tuned choke, this would mean that the coil 62 or tx5 must form a resonant tank...basically the coil that is in reverse direction, will only resonate if with the cell capacitance in relation to the ground so connecting the ground to the base of the tuned choke is the only requisite to make of it a tuned coil or clearly speaking a resonant tank.


The capacitance will be that of the cell casing not between the tubes therefore i would recommend incrementing this capacitance, to be easier to achieve the resonance, however if you add a capacitors in parallel instead of maximizing this capacitance, you will not have all the field on the water...


This capacitance will be relative from the inner tube therefore where the tuned coil is connected, and the outside of the acrylic housing so when you add a conductor around the cell thereto you increase the capacitance....


So basically that all...   


$ 1 5.0E-6 0.7389056098930651 45 5.0 43
c 688 368 688 272 0 1.0E-8 894.0930888253006
r 768 272 768 192 0 10000.0
c 688 192 688 272 0 1.0000000000000001E-7 -85.1028883763214
w 544 368 688 272 0
w 768 272 688 272 0
w 544 368 624 464 0
T 368 208 496 368 0 4.0 10.0 1.5481661429245648 -0.15499942621867285 0.999
v 368 208 368 368 0 2 2500.0 5.0 0.0 0.0 0.5
T 544 192 688 368 0 1.0 1.0 0.1549994262188145 -0.1048804806872442 0.99
w 768 192 688 192 0
w 496 368 528 464 0
d 496 208 544 192 1 0.805904783
s 528 464 624 464 0 0 true
o 0 1 0 299 2394.524282602951 0.37414441915671115 0 -1
o 2 1 0 43 320.0 0.4 1 -1
o 7 1 1 291 40.0 9.765625E-5 2 -1
o 12 1 0 291 7.62939453125E-5 0.4 3 -1


here you see why the dielectric proprieties are important in the right you see the tx5... everything is connected like should be the vic. Notice how tx5 close the resonant tank...


well i'm here work, hope soon i can show what i'm talking about...


Br

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I was testing my circuit re-soldering here and there and i found that i was doing something wrong, basically the tc4429 mosfet driver is an inverting driver so the signal that is going correct in it is getting inverted, so i'm going to use one of the nor gates for inverting the signal than everything will be fine... This was completely killing the resonance cause the transformer remained on where should be off. 


Also i think that i will change the water here again so it will be a higher impedance load for the tank, helping the resonance to show up...




Now that i'm getting good in not burning components i think that i should construct the pll system with the high speed components. HTC. This will allow for a greater precision... I will do it in the fast prototype board so i don't lose much time... I will use htc 7046 cause i think i still have one here and will use high speed nor gates too.