Stan Resonance finally cracked! by Sebosfato

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Well this is the thing i'm working on. In this file you find the video showing the wave form in the gate of the mosfet, and a video showing the prototype. I mounted everything in the top case of my technics turntables, and you see in it, a variac, a transformer that is the power supply of the pulsing circuit, the pulsing circuit the gate circuit, the VIC and the cell and a crap but the only last multimeter. You see in the table also my lcr meter. Sorry for the video and pics quality, my cell phone has not a good camera and i don't have other. 


I have just wake up, and i'm going to work another 3 days without sleep again if necessary to finish this. =)


I slept over it while i was trying to add something to protect the mosfet.


I'm going to add a 1kohm resistor connecting the drain to the source, and also a 100nf cap i also have a diode in series with the mosfet.


I hope someone can give a hint here on how to make the circuit more stable and un-burnable.


Also in the pulsing waveform video you see that sometimes the logic remains high after the pulse so the mosfet maybe is not turning off, I don't know if is true or if is a problem of the pc scope visualization...


My pulsing circuit is pretty much the same in the patent. I was thinking to add a 10kohm resistor from pin 5 of the pll to positive but don't know if would help much. .


Well check this out!

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I think that i'm going to add the resonant feed back circuit, and i will also connect another coil in series with the TX5 so i can reduce the resonant frequency since my circuit seems to not working very well at high frequency, (not sure if is not the oscilloscope that is not able to measure well)
anyway i will use a coil in a flyback core... In this flyback core i will provide another winding that will be the feedback... I will do this cause i think will be a purer signal of the resonance.

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Just though of something, if i add a resistor between the ground and the source of the mosfet whenever the current raise there will be a voltage developed across the resistor therefore the voltage at the gate in relation to the drain will be automatically reduced. Now i just need to calculate the ideal resistor to acomplish this. I also added a diode in series with the mosfet that resisted the breakdown its rated 1200v 30 amps ultra fast.


I will also add a uf4007 diode in antiparallel with the 100ohms resistor that sits between the gate and the driver, i'm currently using tc4429 driver..
This will provide a faster turn off time. I also have a 1kohm wire wound precision 10 turn variable resistor between the gate and the ground, this form a voltage divider that i use to just input the right voltage at the mosfet to control the current rise.

I'm thinking about adding also a diode between the ground and the gate in just in case to prevent the voltage to not become negative i relation to the ground, this can turn on the mosfets again so i want to prevent this. I may want to use a diode with low voltage drop maybe germanium..

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Now the circuit works nicer, i added a 2 ohm resistor in series with the mosfet between source and ground. I added a diode in antiparallel with the 100 ohms resistor between the gate and the driver. I added a diode between drain and gate in parallel with the 1kohm variable resistor, and i added a 1khm resistor and a 100nf capacitor between the drain and source.


Obs the 1k resistor is 5 watts and works really hot, i'm thinking about using a bigger value resistor.


The noize of the vic is now very clear. no more false triggering..


Now i just need to hook up the feedback and tune into the resonance.


I'm going to add a variable inductance that i will vary turning a bolt to insert or take out the core of it, i made a very nice design. = )


Now university


Tomorrow never knows.


I think the thing is going to work.


i just think that i need gate generator that is more stable. I will try making it more solid. Any good diagram? Does anyone ever understood stan diagrams for the gate circuit?

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I found here a schematic that use the same components i used for the gate circuit that i'm using but is a bit different... It also provide the calculation for the frequency... I will post both schematics here the first one is the new one i'm going to try!

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Its really sad to come here and share all this and stay here talking alone. Seems to me like every one reads and download my theories but wont show any interest in help in anyway before the thing works..


If i was rude or anything else along my posts i'm sorry for that, probably is a misinterpretation cause i didn't mean to be, english is not my mother tong.
I say this cause in the past in other forums also people tend to think that i'm a kind of stupid person but i'm not, maybe i just don't communicate the way i was wishing...




Please come here, ask questions, comment, tell me what you think, criticizes, discuss, i'm here for that...


Fight for your ideas, you are the only one that can defend your self... 

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Sebo,

You are fine.  Don't take the silence so personal.  I've used the 555/393 circuit that you show.  I use two and have one gate the pulse stream from the first using a 4046 circuit with mosfet driver.  I've found using a mosfet driver solves a lot of problems at the switch.

I'm still playing the tinfoil angle.  I have three large gallon size leyden jars connected in parallel to the tinfoil covered plastic cell jar.  The negative and positive leads connect in parallel to each and the cell.  However, I'm reaching voltages now that are frying my bridge rectifier even a 1000v one.  Feedback to it may be the cause but I don't know.

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.

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Hi kickbackemf, thanks for reply..

I think so too, we need very stable frequency to be able to maintain resonance. I already done work on that couple of years ago, and i could maintain resonance in the kilowatts range with low input power using the same kind circuit even not using the feedback circuit...  i'm not sure what is happening here, but i guess that today or the next days i will get on that again... I think that the coupling of the resonant choke with the core is too big and or my primary is too small... Actually in the past i never achieved resonance all in the same core... But probably is possible..


You should use higher rating diodes with high speed and higher amp ratings cause when the pulse is to short the current become too big...


In the past i made the resonance in a separated coil driven in parallel with high voltage and low amperage so not in the input transformer witch become than an easier task... So i'm going to add a coil in series with tx5 1° to lower the resonant frequency, and 2° to decouple the resonance from the primary a bit... I will put two coils in this core one for the positive and one for the negative... so the resonance can still induce voltage in the other side of the circuit... I think that the primary must have a higher impedance in the case we want the vic to resonate cause otherwise the pulses kill the resonance, by changing the core inductance too much...


I think that if i had a bigger cell would be easier cause the frequency would also be smaller..

This is the adjustable tune coil core that i'm going to use...  I used some springs i had here and a paper box that i make harder adding some wood glue... I'm finishing it just need to find a nice bolt...