Some Bifilar coil experiments

[evostars]

I'm not sure I understand Evo ,your pulsing the middle coil, and the two outside coils are putting out 900 volts?

Thanks Shylo.

The top coil produces (around) 500V and the bottom coil produces 500V opposite phase.
The probes are connected to the outer rims, of the top and bottom coils.
10x setting. 5V per division around 10 divisions gives 500V peak to peak

[MileHigh]

I find this very intriguing ,if I could raise my voltage to those levels, I would think a self runner is inevitable.

This has been covered over and over on the forums, I don't even know why I am bothering to post this.

The resonant system is simply storing more and more incremental energy supplied from the power supply.  For each cycle, the power supply adds some incremental amount of energy to the resonant system and the observed peak-to-peak voltage amplitude goes incrementally higher.

Eventually a balance point is reached where the incremental addition of energy per cycle is in balance with the incremental energy lost per cycle and the observed peak-to-peak voltage amplitude stops increasing and reaches a steady state.

There are probably 1000+ web sites that explain this process.

[dieter]

evostars, you need to get the loading time into the calculation. Your caps cannot deliver 900vdc constantly. This only how high the voltage goes at max. It's the noload voltage.


Again, 900*900=81'000*1.6uF=~128milli *0.5=64 millijoule. How do you get 1.8 Joule?


Anyway, by adding a load such as a 100 ohm resistor, you can calculate the amps based on voltage. If the voltage were 200vdc at the load, then it were 200 vdc / 100 ohm= 2 ampere. And hat would be 200 vdc * 2 amps = 400 Watt.


Then again, your yellow multimeter looks like it has amp section.


Well, it may be relatively easy to autoadjust the frequency to resonance, the sam way tv and radio did it to follow a drifting station. I think it was termed AFC? Raher simple circuit.

[dieter]

btw sorry bout the typos, my keyboard sucks.

[Dog-One]

Speculation from here on: The ratio between voltage in and out is around 77

Quite interesting considering the turns ratio is one to one.  At first glance with two coils, one would think 24 volts is about all you would get out of there.  A rather novel form of boost converter you have assembled there Evo.  I'll bet getting that 180 degree phase relationship was tricky to do.  Does it move around when the storage capacitors are charging?

So these coils produce a nice sine wave even though you are injecting a short duration pulse?  What's the approximate duty cycle?