Kapanadze Cousin - DALLY FREE ENERGY

[Void]

Here's the US (English) version of a patent application from Gerson Silva Paiva.
A quick peruse through the patent application shows it has a sparkgap and
a coil assembly along the lines of the simple device Kapanadze showed in his 2004 video.

It looks like possibly Paiva maybe made a bit of a variation and is trying to patent something
similar to Kapanadze's devices. I have run across a couple of other patent applications from others
over the last several years that looked like they were trying to patent something very close
to what Kapanadze has done, appearing to try to rip off Kapanadze's invention. I didn't
look at the Paiva patent application in detail however, but from what I saw there seems to be some real
similarities to what we know about Kapanadze's setup.

[NickZ]

Nick,


i think your blurry picture of your scope shows it is set at 2us/div. not 0.2us.
So this makes the time between the 2 top pulses 4us (2 div.) which is 250KHz.

So the ringing i see is of a 250Khz resonance signal, which is about 1/8th of your ringing signal without a cap (1.98Mhz), which is way to much as we need 1/2.

Concerning the expanded ringing screenshot, this is a strange signal and i also need to see the un-expanded signal as i now have no idea where/when this ringing
occurres, at turnon or turnoff time.


I think it is better to wait for your new scope / new MOSFETs so we can have high quality pictures of a good situation.


Thanks,  itsu
[/quote


  Itsu:
  I also tried a 152 capacitor(1.5nf), as well as a pair of 271 caps 2000v,  for the snubbers
But, it's like you said, not possible to reduce the ringing peak to lower than 200v, without affecting the rest of the ringing. So, not sure what to do about that.
I did tune at the 3t/inductor for best output, first. Which brought the peaks UP to over 250v. So I think that the 271 caps along with a resistor, may be my best bet.
   I've got the new FETs now, but, I'm afraid to install them, as yet.  With no snubbers on, the spikes and voltages
are going over 300v or so. No wonder my FETs were failing.

[itsu]

Nick,

those 300V spikes are there even with a 24V (or 2 x 12V in series) bulb in the 24V supply line?
Try to go down to 12V for now to lower these spikes or you might go for a higher voltage MOSFET like some IRFP460.

We are not trying to dampen the spikes yet by adding a drain/source cap, we first try to get half of the ringing signal by adding a cap.
This is a first step to continue to build / calculate an RC snubber.

Guess with a 271 tagged cap you mean 471  (470pF), if so, 2 of them in parallel (940pF) would probably be a correct value to half your ringing frequency, but
use your new scope to take a screenshot of that ringing both expanded as un-expanded.

Itsu 

[Hoppy]

Nick,

You may be getting a false reading of the initial spike voltage using your standard scope lead ground. Its important to make this as short as possible by connecting a short ground wire and measuring directly across the mosfets drain and source leads. Remove the 3 inch croc-clip ground lead, pull off the plastic probe housing and connect a short length of wire to the earth ring behind the now exposed probe pin - see attached. If your snubbers still fail to reduce the spike to an acceptable value under the rated mosfet voltage (BV_DSS) - not higher that about 80% of this value) then as I suggested in an earlier post, you may need to re-lay your mosfets and their driver chips to ensure that they are as close as possible to each other, in order to reduce parasitic inductance that may well be causing the problem. It would be good practice to do re-lay these components as step one.

[itsu]

Hoppy,

good advice concerning the probe, i just tested it out using my Owon scope which has these RF probe tips.
When using the normal 3 inch croc-clip ground leads i see a 407Vpp spike, when using these special RF probe tips, its around 290Vpp.

So these normal 3 inch croc-clip ground leads can induce some false readings with these kind of fast pulses.


Itsu