Is this the Smith/Kapanadze secret ?

[Jack Noskills]

Consider a resonant tank circuit, when tuned current at certain frequency does not go through. When power is collected using secondary coil back-EMF is induced to source which drives tank circuit off resonance lowering its impedance (inductive reactance) and more current begins to go through it, power gets used. When using high frequency then amount of wire used in secondary can be less and if such a short secondary coil is shorted then it has no effect on primary side. There is no DC resistance hence it has no effect, I have tested this several times using different coils and also Utkin explains it well. But the instant there is load Mr Lenz kicks in and resonance is destroyed in the tank and current begins to get through.

My idea is simple. What if we could create a second back-EMF which is exactly opposite (180 degrees) to first back EMF ? Then those two back EMF would cancel each other out and resonance is not destroyed. As resonance condition stays tank circuit blocks current coming from source and power is not used. Only reactive power that is running in the tank is copied to load.

Look at the schematic picture, there is tuned tank circuit and CW wound coil, then connected to it is second coil wound CCW and series capacitor to get series resonance. Secondary then goes over two primaries. When there is no load taken, the tank circuit is 'hot', it has all power there as reactive power and it effectively blocks current flow at the resonant frequency. The second primary is 'cold', it is only delivering little power to tank circuit. Next load is connected, what happens ? There are two primaries so both gets back-EMF into them. But now primaries are in opposite direction so we will get a 180 degrees phase shift and back-EMFs cancel each other out.

Input has to be sine wave, as tank circuits can only block sine waves at its resonant frequency. Any attempt to use spark gaps, half sine or square waves at source will not work when using this schematic.

Kind a simple idea isn't it, anyone care to take a closer look or has this been tried before ?

[stprue]

Hello,

What were your results?  Which direction is the secondary coil wound (cw or ccw) ?

[Jack Noskills]

Secondary direction does not matter. I am doing some testing and already have reached a point where connecting load has no effect on input. But my input trafo is not tuned. I use audio amplifier and I need to step up voltage first to get above 5 volts. Now my problem is that this stepup trafo is not at correct frequency and it uses power though there is no load. If I can make a tank circuit in that also then I should see some good results.

[Hoppy]

Secondary direction does not matter. I am doing some testing and already have reached a point where connecting load has no effect on input. But my input trafo is not tuned. I use audio amplifier and I need to step up voltage first to get above 5 volts. Now my problem is that this stepup trafo is not at correct frequency and it uses power though there is no load. If I can make a tank circuit in that also then I should see some good results.

Jack,

You appear to have already made some progress. Can you provide full details of your build, test and measurement setup and results, so that others may experiment along the same lines?

[verpies]

Look at the schematic picture, there is tuned tank circuit and CW wound coil, then connected to it is second coil wound CCW and series capacitor to get series resonance. Secondary then goes over two primaries.

You are neglecting the mutual inductance between W1 and W2.
There is a huge difference between behaviors of circuits depicted in Diag.1 and in Diag.2.

If you still think that your idea still has merit, let me know...