Confirmation of OU devices and claims

[Hoppy]

http://witricity.com/wp-content/uploads/2016/12/White_Paper_20161218.pdf

[seaad]

Itsu good craftmanship!
As this experiment is using a [almost] square  wave input we can first estimate roughly a minimum of 15 -20 percent loss [ see your Spectrum Analyze ] only depending of wasted overtone energy that will never be sucked into the secondary coils if I'm right. The Secondary coils are only tuned to one tone, the first (over)tone.
To check if I'm right. Pls. make a spectrum reading at the point before the diode bridge. But without the diode bridge and with a 50 Ohm load.  Strong first tone and weak (no) overtones.
If you see strong overtones there with similarity to  the primary emission, then I'm wrong. Not enough filtering! Maybe good in your eyes.
See also my previous impedanse matching suggestions.
If you are able, make some efficiency tests with 3, 4, 5 sec. coils to see and evaluate, predikt if a much greater number of secoday coils maybe will improve the effectiveness.
In my eyes the main issues here are impedanse matching, the primary wave form and LED:s  .
If you still belive that the sharp square waveform is a must for the best result then the secondarys have to be constructed in a different way so they are able to take on, suck up All harmonics. Of course only valid if I'm right. Good filtering now.

Regards Arne

[itsu]

Thanks Arne,

i see where you are coming from with those harmonics etc., it sounds logical to me.

But the square wave signal (rate of change) seems to be a vital part of this setup it seems (its not my idea by the way).

The resonant TX coil will produce a strong sine wave on the resonant frequency which will be picked up
by the RX coils on their (same) resonant frequeny and thus filtering that frequency out.
So i expect to see (Spectrum wise) only a resonant frequency signal on the RX's.

But i will see what i can do, it involves some modifications to the setup.

Regards Itsu

[AlienGrey]

Thanks Arne,

i see where you are coming from with those harmonics etc., it sounds logical to me.

But the square wave signal (rate of change) seems to be a vital part of this setup it seems (its not my idea by the way).

The resonant TX coil will produce a strong sine wave on the resonant frequency which will be picked up
by the RX coils on their (same) resonant frequeny and thus filtering that frequency out.
So i expect to see (Spectrum wise) only a resonant frequency signal on the RX's.

But i will see what i can do, it involves some modifications to the setup.

Regards Itsu

Here read this you might find this could help you if not already known or clear.
https://en.wikipedia.org/wiki/Ferroresonance_in_electricity_networks

[Vortex1]

Here read this you might find this could help you if not already known or clear.
https://en.wikipedia.org/wiki/Ferroresonance_in_electricity_networks

That article specifically addresses iron core transformers hence ferro-resonance. Here we are talking about air core transformers which do not exhibit this effect.

Ferro-resonance is typically used in transformers to provide a degree of voltage regulation. (CVT's)

A slightly higher Q might be obtained if ferrite rods, Litz wire and low dissipation factor capacitors such as vacuum or mica types were used. The ferrite rods would allow fewer turns for the same inductance, thus cutting down on copper resistive losses. Nevertheless, the power coupling would still be less than 100%. The efficacy of the improvement would depend on frequency as ferrites also get lossy at higher frequencies so there would be an optimum frequency point where benifit could be achieved for a given ferrite material type.

Alternately the air core coils could be made of silver plated thin wall copper tubing as used in radio transmitters to keep losses low and Q high. Still it will be less than 100% power transfer.

Regards