Hi there,

The output coil with capacitor there is Parallel Resonance Circuit - http://www.electronics-tutorials.ws/accircuits/parallel-resonance.html
The bulb is resistor there and is part of resonant circuit. This is why it light up when in the LC part the maximum amount of energy is accumulated.
The primary is Series Resonant LC Circuit ( http://www.electronics-tutorials.ws/accircuits/series-resonance.html) as well and it is tuned for maximum magnetic field forces transfer to secondary coil on the same frequency. You can play with these circuits on low power if you like and will see same effects.

It is also some kind incomplete than I shown in http://www.overunity.com/12736/kapanadze-cousin-dally-free-energy/msg357338/#msg357338 so there is more current draw from power source...

P.S> The driver there is Mazzilli circuit ( http://adammunich.com/zvs-driver/) not nanosecond pulse generator.

Cheers!

Hi there,

The output coil with capacitor there is Parallel Resonance Circuit - http://www.electronics-tutorials.ws/accircuits/parallel-resonance.html
The bulb is resistor there and is part of resonant circuit. This is why it light up when in the LC part the maximum amount of energy is accumulated.
The primary is Series Resonant LC Circuit ( http://www.electronics-tutorials.ws/accircuits/series-resonance.html) as well and it is tuned for maximum magnetic field forces transfer to secondary coil on the same frequency. You can play with these circuits on low power if you like and will see same effects.

It is also some kind incomplete than I shown in http://www.overunity.com/12736/kapanadze-cousin-dally-free-energy/msg357338/#msg357338 so there is more current draw from power source...

P.S> The driver there is Mazzilli circuit ( http://adammunich.com/zvs-driver/) not nanosecond pulse generator.

Cheers!

hi T-1000,

 Whatever you have mentioned above is  taught in mainstream engineering/by the book hence your explanation is still 100% valid.
"tuned using L/C resonance for maximum magnetic field forces transfer to secondary coil on the same frequency."

"Please listen to my explanation below to stop the confusion as what was already taught in mainstream"

But key part i am talking about was "completely left out" from the mainstream engineering studies as nicely demonstrated in the Russian video.
Which is connecting load at the secondary coil which do not cause current draw to increase at the primary and no notable current increase at battery supply which i have achieved on the basic Don smith device.
"Only unknown dumb fools would immediately jump in at this point and say did you get it self running yet.Answer is not yet at the moment.Only sorted out the L/C tuning portion few months back using low voltage <70volts"


You see base on my experiment on Don smith device a simple and straight forward device with typical 5 turn primary and around 18 turns secondary cw,ccw winding.
You see few months back i did apply(Like what you have mentioned as what was taught) matching L/C resonance on the secondary coil which the L/C resonance closely matched the primary coil as driven by the frequency around 210khz.

Using 60volts boosted power supply from 12volts and single driver mosfet drain connected in series to the (5 turns 8AWG with around 1.7uH which is also connected to the typical 0.33uf induction heating capacitor rated at around 275a/c

Using the above matching L/C approach(As you already mentioned) what i have merely done is just created a "Air cored step-up transformer" running at frequency above 200khz upon connecting a 60watt bulb 230volts.But as usual connecting load at secondary output(As what was typically taught in mainstream education) do cause increase in current drawn from 12volts battery.
"There is nothing unusual about the experiment"

The only interesting part comes if you apply 1/4 L/C resonance at the secondary from the primary frequency 210khz which is tuning secondary coil L/C resonance to 1/4 of 210khz which is around 52.6khz and this time primary coil is move to the center of cw,ccw coil.

Now although the output voltage from secondary isn't interesting at around 21volts but this upon "shorting the output L/C combination at secondary" do not register any notable increase <100mA(difference)  in current drawn at battery.(Take note my primary objective of the low voltage at mere 60volts  driven Don smith experiment before i even began was to know if there is any difference applying 1/4 rule few months back.)

This is what is going on for the Russian video.I wonder why people have not mentioned about the fragile 24volts 2Amp solid state adapter which did not not blow up upon connecting a drill.Although i am aware although adapter may indicate 2Amp as safe operating range it can provide little higher amps say 2.5amp maybe 3amp for a short while without blowing the mini fuse inside adapter as normally found in these type of branded adapter as a safety measure to prevent a fire.

For the Russian video-What surprised me that there is no 1/4 rule being applied.In fact it's either 1/ 2.8xx or 1/(2.8xx  x2) of the mains frequency to power a drill(below 100% speed) of this size would typically be at least 400watt or best possible case around 800watt and still did not cause the adapter to trip."Did you not think about the adapter capability during drill test with high starting amps"

There is something interesting about the Russian education system which is clearly missing from mine or yours.

I am no longer interested in people whom merely "provide unverified unlimited assumptions as commonly found in this forum" whom do not provide any tested experimental prove or no backing in the form of a youtube video.
"Remember this we should never never assume unless you have tested it yourself or already proven by someone else"

Although some i do accept only some form of suggestions which is nice to accelerate R&D.
 
Replicating the Russian experiment with drill or bulb is a very good starting point related to unusual L/C resonance.

I don't know if this concept was already applied for the "Akula yoke core" or other ferrite base experiment without effecting input primary current drawn.

Every experiment needs to start simple at first.

hi Zcsaba77,

There is no moveable parts.
Please  refer to "Nick Zec" video 1 as found in youtube for the Yoke core winding turns needed.

The output of the yoke core is higher voltage than supply 12volts.
If you want to create another external primary coil around 5 turns as a test for induction heating as a verification.
You will need to know your estimated frequency produced from yoke core to derive a L/C on the external coil.

I have just drawn you a sketch on what i am talking about before even winding a layered secondary.

The mazilli circuit base on my experiment revealed the circuit is highly dependent on "winding+capacitor" or LC resonance.Under load the default resonance achieved would likely "drift".

PWM circuit as compared to mazilli is a more reliable\stable under external load which allow tuning easily.
I would normally lower the duty cycle <10% then tune up or tune down pwm generator frequency to obtain maximum voltage output for any core using <10% duty cycle.
Then once it is set i would increase duty cycle accordingly.

It will be wise to start with PWM circuit.
For example i bought 10 pieces of 3525 pwm i/c for $3 USD with free shipping."I know 10 pieces sound overkill but trust me you may destroy 1 or 2 along the way."
http://www.ebay.com/itm/300925833957?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

If you want to experiment with IGBT the shortcut is to connect "VC" from  PWM I/C to 18...20volts  stepped voltage up as provided by MC34063 circuit 19v...21volts."This is not shown else where in internet.It's just my findings that's all"



I have attached my PWM circuit drawing before starting PCB design and i have drawn you a sketch from yoke core output.
Try to search on induction heating on 15volts...36volts for start but those were not voltage stepped up and it's base on source voltage.
You are on your own at this point at this stage.
But i look forward to your success.

For everyone else - "These experiment are not for beginners into electronics if you don't understand how to get resonance,understand impedance mismatch and many etc."
You will to need to know what can possibly go wrong even before your start experimenting.Else you are simply wasting time.

Hi MagPWR

Many thanks. But I still have question for you (or whoever else who read this post).
Frequency on yoke primary side is same with secondary side? of course with induction coil!
Is possible use 494 instead of 3525 ic? (because I have some 494s ic)?
I try decipher your handwrites (I think before just mine is unreadable, but I see Im not alone lol)
on 3525 ic legs 1 and 9 is short cuted? or these connets goes to coil trough mosfets?
4, 8, 11, 14 legs is open? or connected to somewhere?
how much turns prefered on yoke primary and secondary side? and how large wire? (mm2)
if I will build yoke transformer will be static, will search the frequency on yoke and after will search on induction coil, right? (of course finding the right capacitor(s) on induction coil)
can you put again what you writes by hand on induction side?

regards zcsaba77

Hi MagPWR

Many thanks. But I still have question for you (or whoever else who read this post).
Frequency on yoke primary side is same with secondary side? of course with induction coil!
Is possible use 494 instead of 3525 ic? (because I have some 494s ic)?
I try decipher your handwrites (I think before just mine is unreadable, but I see Im not alone lol)
on 3525 ic legs 1 and 9 is short cuted? or these connets goes to coil trough mosfets?
4, 8, 11, 14 legs is open? or connected to somewhere?
how much turns prefered on yoke primary and secondary side? and how large wire? (mm2)
if I will build yoke transformer will be static, will search the frequency on yoke and after will search on induction coil, right? (of course finding the right capacitor(s) on induction coil)
can you put again what you writes by hand on induction side?

regards zcsaba77

hi zcsaba77,

Upon comparing both PWM I/C: TL494 and SG3525 using 2 datasheets displayed on 2     23"inch monitors side by side from 1 laptop sometime back.
It seems both I/C have nearly the same supported voltage,frequency range.Since i have started working with locally available 3525 i am more comfortable with it.

My primary reason in selecting SG3535A is purely to cut cost bought 10 for mere $3 USD in ebay and comes with free worldwide delivery.
Locally it's cost me below around $2.5usd per piece.Accidents do happen during prototyping on breadboard especially if you are rushing.
Strangely i tend to be more careful if i am left with only pwm i/c as i know the consequence "down time"

Yes pin 1 and pin 9 is connected for sg3525.The output is pin 11 and pin 14.
Yes pin 4 and 8 is open.
Unless you want to apply optional "soft start where duty starts from 3% then gradually increase to set duty cycle eg:30%" then merely connect 100uf cap + to pin 8 and cap - to gnd.
Do play around with cap value to get your desired soft-start time from ms delay to nearly 2minutes delay.

I have also attached faster more costly PWM I/C:3825 diagram which produce nice waveform for frequency above 200khz.

The only experiment i ever done on yoke core was the Geofusion roundcore experiment powering the Halogen tube few months back.

I would suggest you follow winding details from Nickz "Nick Zec" video in youtube.I'm sure he would assist you if you need help.

Nickz have yet to upload his version of drawn schematic containing all the component value details for anyone whom wish to start with yoke core experiment base on his latest video uploaded around 2 wk back.

The device setup in itself is impressive to somehow power a drill designed to run on 50/60hz.I did not mentioned bulbs since i'm little sick of it after seeing many videos using bulbs.

Since the drills are usually variable, they are probably actually DC things and have a rectifier immediate at the AC source; as long as they are reasonably fast diodes would still work...

Square wave?  nano second pulser?    Like T1000 already mentioned; i don´t think so.

My system:

input: 24V dc  2A limited
Mazilli circuit
Main coil 2 x 5 turns od 12.5cm total 19uH (2.5mm2 wire)
small coil 80 turns (2x 40) od 5cm 75uH (2.5mm2 wire)

Mazilli circuit capacitor used:

first 1.1uF (2x 2.2uF in series)   = resonance frequency 35KHz and nice sine wave signal  (caps getting hot!)
then  784nF (680 + 104nF parallel) = resonance frequency 42khZ and again nice sine wave (caps not getting hot).

Small coil (75uH) capacitor used (with bulb 220V / 60W):
first no cap, frequency 42 KHz, almost no light, input current 800mA.
then  224nF, frequency of the whole system increases from 42 to 45KHz, no visible increase in light, current input goes from 800mA to 900mA.
then  104nF, frequency of the whole system decreases from 42 to 37KHz, increase in light, current input goes from 800mA to 2A (limited), cap is getting hot!

Video here:  https://www.youtube.com/watch?v=2HUrNDdHyKY&feature=youtu.be

Question:  why do the caps getting hot in those circumstances? Both are rated to handle the voltages (400 / 630V)

Regards Itsu

Square wave?  nano second pulser?    Like T1000 already mentioned; i don´t think so.

My system:

input: 24V dc  2A limited
Mazilli circuit
Main coil 2 x 5 turns od 12.5cm total 19uH (2.5mm2 wire)
small coil 80 turns (2x 40) od 5cm 75uH (2.5mm2 wire)

Mazilli circuit capacitor used:

first 1.1uF (2x 2.2uF in series)   = resonance frequency 35KHz and nice sign wave signal  (caps getting hot!)
then  784nF (680 + 104nF parallel) = resonance frequency 42khZ and again nice sign wave (caps not getting hot).

Small coil (75uH) capacitor used (with bulb 220V / 60W):
first no cap, frequency 42 KHz, almost no light, input current 800mA.
then  224nF, frequency of the whole system increases from 42 to 45KHz, no visible increase in light, current input goes from 800mA to 900mA.
then  104nF, frequency of the whole system decreases from 42 to 37KHz, increase in light, current input goes from 800mA to 2A (limited), cap is getting hot!

Video here:  https://www.youtube.com/watch?v=2HUrNDdHyKY&feature=youtu.be

Question:  why do the caps getting hot in those circumstances? Both are rated to handle the voltages (400 / 630V)

Regards Itsu

hi itsu,

The capacitor you are using is a "Metalized Polyester Film Capacitor" with rated value as labelled on capacitor nothing looks unusual in this area.

However the primary reason why these type of capacitors are never used in the actual induction heater 1000...2000watt cooker is because the capacitor "internal resistance is higher".
It is not fabricated to handle "high Amps".I have used actual "induction heater capacitors" find that those are better for the job but typical come in common range like 0.2uf...0.33uf 275A/c.

I am merely suspecting the device creator is likely using IGBT with a "lower gate capacitance" if you compared the mosfet you using against another types via datasheet.
The switching frequency might be impacted because of the gate capacitance.

I agree certain type of L/C meter can't display any value below 1 or 2uH.

This is the cheap precision L/C meter that i'm using which can display just below 1uH.For measuring inductance both probe needs to shorted together beforehand and Zero button needs to be press until OK is display on screen.
That this point the L/C meter is calibrated while it is powered on by 4xAA.

For capacitor both probe needs to be unconnected as it is and press OK to calibrate meter once it's is powered on.


http://www.ebay.com/itm/1pcs-New-L-C-Inductance-Capacitance-Multimeter-Meter-LC200A-Tool-lm-/291099820083?pt=LH_DefaultDomain_0&hash=item43c6e6c033


Interesting outcome 300vpp under bulb load and power consume is 19.5voltx2Amps =39watt(Very interesting finding.Not in resonance to achieve higher peak to peak output voltage under load )