Confirmation of OU devices and claims

[lancaIV]

a.king21, I have to thank you for the further information given by #333 and #334 reply !

So this is the same information source and technical design like benfr is referring.

So now the statement "900W" magnetic field force is based by electric  " 1300 V x ?" discharge  !

Excitated surge power with short duty cycle
Okay !

Sincerely
OCWL

[itsu]

I completed a prototype for a receiver and the transmitter, see picture

The receiver has the 163uH coil, a 100pF trimmer cap, 4x bat46 schottky diodes as FWBR, a bidi 220uF buffer cap and
a 50 Ohm 1% inductionfree resistor (load).

The transmitter has a 163uH coil, an empty socket for a future gate driver, 2x 100pF in series (50pF) cap and is
driven now by my FG.

FG is set to resonance (1.578Khz) square wave 50% duty cycle, pulsed DC (like a gate driver would) and the screenshot shows:

Blue is the the input voltage (5Vpp DC)
Green is the input current
purple is the voltage across the 50pF cap
Red is the math trace (blue x green = input voltage x input current)

The DMM is across the 50 Ohm load and shows 244mV.

So we have 25.6mW input, and the output across the receiver shows 1.2mW  (P=U²/R  =0.244²/50 = 1.2mW)

Moving the receiver closer increases its output, but effects the transmitter resonance frequency.

Will build 4 additional receivers now.

Regards Itsu

[gyulasun]

Hi itsu,

Thanks for showing the details on the measurements.
Would like to ask the DC resistance of both the transmitter and the receiver coils when you have time to check them. 

Yes, it is normal that the receiver coil detunes the transmitter coil and vice versa, especially when you will have
all the 5 receiver coils. You will need to fine tune all the trimmer caps a little whenever you change on the distances
between TX-RX coils. In fact, you would need a fine tuning possibility for the TX LC circuit but maybe with slowly
fine tuning the function generator to the slightly pulled TX LC circuit (pulled by the RX coils whenever distances
are changed), you would not need a trimmer cap there. 
Of course when fine tuning the generator for the TX circuit, the receiver coils need retuning a little again,
a mutual back and forth interaction happens and should be corrected accordingly. On the receiver side
an analog meter will nicely show the voltage maximums instead of a DMM.  I think you know all these.   
Gyula

[lancaIV]

Hello itsu,

https://www.google.com/search?q=kanarev+pulse+power&ie=utf-8&oe=utf-8&client=firefox-b-m
Kanarev showed the problem with pulse power calculation.

Voltage pulse amplitude
Current pulse amplitude

Power pulse amplitude

Pulse duration
Pulse repitition period
Pulse frequency

Duty ratio
Duty factor Z

Average Voltage

Average Amperage

Average power

So the first question : how much real input power ? pulsed P to P = ( UxZ)x(IxZ)     = 25,6 mW ?


Sincerely
OCWL

[Vortex1]

Of Snakecoils and other things

In the early days of radio, engineers and experimenters figured out fairly quickly

that if you wanted efficient transfer of power, you would need to have excellent

coupling (K approaching 1.0). Minimizing distance between air core coils by nesting

them one in the other co-axially helped to achieve a higher K while separating them reduced K.

Where multiple secondaries were needed, these were also nested co-axially to keep

the coupling factor between coils as high as possible.

Itsu has just demonstrated the effect of a low K transformer, where power transfer

is greatly reduced. Had his coils been nested coaxially, the K factor and coupling

would have improved considerably.

Somehow the idea has crept in due to the inexperience of certain "teachers" that

just adding a lot of coils separated from the primary coils will magically increase

the power transfer. This is not so.

When the words "primary" and "secondary" are substituted for "transmitter" and "receiver"

it becomes obvious what we  have is a common air core transformer with a low K factor.

and thus a large  amount of the mystique is removed.

In an air core transformer with multiple secondaries widely distanced from the

primary you cannot capture more power in the secondaries than is being input

regardless of the certainty of those who teach this. Because of the separation distance and low K,

much of the primary power will not be useful to the

secondaries, and this is normally termed leakage inductance by engineers.

Also being espoused by the new "teachers" is that you need to resonate the secondaries to get the voltage to

increase. You may do this, but when you then place on the secondaries a useful

load, you wind up collapsing the high voltage that was created in resonance, killing

the Q of the resonant tank. The high resonance voltage is greatly reduced due to the

fact that power is delivered out of the resonant system at the same rate it is being

input, so there is little to nothing left for the resonant system to work with to

store energy and build a high voltage.

Loads that only require milliwatts such as super bright LED's or neons only lightly

load the secondaries and serve to fool many in place of the accurate primary and

secondary power measurements needed to be done with good equipment. The cry we hear

is "see how many led's I can light on all my little coils with only one transmitting

coil" but no real measurements are performed.

Thank you Itsu, for your actual power measurement  clearly demonstrates that the separation distance

that creates  poor coupling (low K) greatly reduces power transfer in an ordinary air core transformer,

regardless of the resonant tuning of such. BTW, this fairly accurately agrees with simulations of the same.

Regards