Kapanadze Cousin - DALLY FREE ENERGY

[magpwr]

Very nice setup magpwr! Thanks a lot. In this specific arrangement how much current does it consume? I mean is it strong enough to drive a secondary for Tesla or Smith experiments? I am ready to order some staff to build Geofusion's circuit for this purpose, but I will give a shot to your design also, as I have in hand two powerful IGBT.

hi Jeg,

The idle current especially for "Air-core" would be around 1 Amp or below.

I can't find the link to show where i got this circuit from.I came across while searching for "induction heating circuit".
But i was very impressed when it was able to make a bolt turn nearly white hot as shown in the web site.

The rectangle shaped capacitors are connected together in parallel i think around 10 of them.I can't remember spec.

You will need to design a high Amp inductor like winding bifilar(parallel) 18awg to get around 220uH on around 3 ..4cm diameter toroid.

[magpwr]

Hey Magpwr
I cant seem to find the data sheet of your transistor in the sch. you posted, got any info.

I like the setup using two chokes without the center tap, I'll give it a shot.

hi Dave45,

The IGBT is found in multisim only.

My induction cooker is using IGBT FGA11N120ANTD 11Amps version at 1800watt rating but i bought these 25Amp from ebay as shown below.

FGA25N120ANTD NPT Trench IGBT  as sold by seller "wellparts" in ebay which comes with free shipment.

I bought 10 of those.

[itsu]

Hi Itsu. Great job on the video demonstrations. Maybe I am just looking at this wrong in some way, but something
doesn't seem to add up in your tank circuit for me. If you had 130nF at 40kHZ, then the total inductance
of your 10 wind tank coil should be around 120uH, if I am not miscalculating. That seems to be a high inductance
to me for that ten turn coil. Do you have an inductance meter that you can measure the inductance of your coil with?
I would be more inclined to think it should be in the vicinity of 12uH? If it is around 12uH, then your total tank capacitance
should be around 1.3uF, not 130nF. Are your capacitors marked 103J (10nF) or 104J (100nF)? Maybe I am making
a calculation estimation error here, but the numbers you mentioned in your video are not adding up for me compared
to your measured results. I would be inclined to guess the tank values are more like 12uH and 1.3uF, based on the measured results.
Am I overlooking or miscalculating something here? 
If it is 120uH and 130nF you were using, then I estimate a tank current of around 1.871 Amps RMS (doesn't explain the caps getting hot).
However, if it is actually 12uH and 1.3uF, then I estimate a tank current of around 18.71 Amps RMS (explains why the capacitors are getting hot even when paralleled)
All the best...

Hi void,
Thanks for the comments, but be carefull not to mix up the used capacitors and the both coils.


The main coil (2x5turns with middle connection) which i calculated to be 19uh (because my cheapo LCR meter does not want to measure it accuratly) has the 8x104nF connected (these caps both measure 104nF and have stamped on them 104 each),  so i assume i will have there something like 832nF.
When i measure them IN the circuit i measure something. Like 2.5uF,  but thats IN the circuit.


This resonates on 40khz.


The secondary coil which i can measure shows 75uH and there i used 13 x 10nF with a total measured capacitance of 133nF.


The bulb was brightest with this 133nF the voltages the highest and the frequency went to 36khz


Hope this clarifies things somewhat allthough i agree that some values don't add up.


Regards itsu

[Void]

Hi void,
Thanks for the comments, but be carefull not to mix up the used capacitors and the both coils.

The main coil (2x5turns with middle connection) which i calculated to be 19uh (because my cheapo LCR meter does not want to measure it accuratly) has the 8x104nF connected (these caps both measure 104nF and have stamped on them 104 each),  so i assume i will have there something like 832nF.
When i measure them IN the circuit i measure something. Like 2.5uF,  but thats IN the circuit.

This resonates on 40khz.

The secondary coil which i can measure shows 75uH and there i used 13 x 10nF with a total measured capacitance of 133nF.

The bulb was brightest with this 133nF the voltages the highest and the frequency went to 36khz

Hope this clarifies things somewhat allthough i agree that some values don't add up.

Regards itsu

Hi Itsu. Ok, thanks. It appears I was misunderstanding how you have things connected up in the video then.
I'll have to rewatch your video again this evening when I have time.
I thought you said you had put 13 x10nF across the primary coil.
By the way, the 104 stamped on a capacitor means a nominal value of 100nF, not a capacitance of 104nF. 
It is usually marked as 104J. This marking decodes as 10 + 4 zeroes picofarads = 100000 picoFarads = 100nF.



Ok, a quick calculation (hope I didn't make an error, but I think this is about right, based on your clarifications above.):
At about 40kHz with approx. 800nF, gives a little over 19uH, as you mentioned.
With these numbers and your scope measurement, I estimate a tank current of about 11.51 Amps RMS.
That is about 1.44 Amps RMS per capacitor.
Apparently still enough current to make your 8 paralleled caps somewhat hot.
Maybe those particular caps don't have really great ESR values.

All the best...

[itsu]

By the way, the 104 stamped on a capacitor means a nominal value of 100nF, not a capacitance of 104nF. 
It is usually marked as 104J. This marking decodes as 10 + 4 zeroes picofarads = 100000 picoFarads = 100nF.

Thanks Void, i did know that somewhere, but as these caps really measure (mostly) 104/105nF (probably because of my cheapo LCR meter) i used that value wrongly 

Ok, a quick calculation (hope I didn't make an error, but I think this is about right, based on your clarifications above.):
At about 40kHz with approx. 800nF, gives a little over 19uH, as you mentioned.
With these numbers and your scope measurement, I estimate a tank current of about 11.51 Amps RMS.
That is about 1.44 Amps RMS per capacitor.
Apparently still enough current to make your 8 paralleled caps somewhat hot.
Maybe those particular caps don't have really great ESR values.

All the best...

Very good, i measured the main tank circuit current using my AC/DC current probe and the system running on 2 12V batteries in series.
I measured both the current (and the voltage) in the blue leg of the main coil (see screenshot below) and in one of the legs of one of the 8 capacitors

The current in the blue leg was 9.5A rms (close to your 11.5A rms) and the current in one of the caps 1A rms, again close to your 1.44A rms, see the video

The yellow trace is the voltage across the Blue 5 turns (compared to the middle tap = ground)
The blue trace is the voltage across the Brown 5 turns (compared to the middle tap = ground)
The green trace is the current probe output from the current in the Blue 5 turns. The external current controller was set to 5A/div.

So yes, apparently the ESR of these 100nF caps is not that good, however i have no idea what a normal value would be   

Video here:  https://www.youtube.com/watch?v=oBfjQ6poHJ8&feature=youtu.be     

Regards Itsu