thebugger

modified 9 years ago

Tesla Coil or Something

518

06:08:44

I saw a few tesla coil examples that were otherwise perfect, but the only problem was the power draw. They drew insane amounts of power from directly rectified mains and i was not ok with that. So accidentally without even attempting, today i found a simple, low voltage high power solution. The idea is a very fine tuned LC filter, but instead of an inductor there is a step up transformer. The LC circuit is very underdamped, but that's not the purpose of the 4ohm resistor. The purpose is to maintain a maximum current limitation, to not overdrive the amp.  This shit is gonna be hard to tune, but when you make the LC circuit, you can always tune the oscillator to the LC circuit instead of the opposite, so as far as you have a nack for it, you'll do it. It probably won't be so easy to make and might require some experimentation, because the secondary will have some capacitance and it needs to be nulled, but some readjustments, and it should be fine. The consumption is 27W

published 10 years ago

nikisalli

10 years ago

An amplifier tesla coil? Nice

WTFCircuit

10 years ago

Very nice, but I noticed something. When you say: "the secondary will have some capacitance and it needs to be nulled" you're saying something both correct and incorrect. Yes the secondary will have some capacitance, but you don't have to annul it, it is like remove the capacitor to a lc oscillator: it can't oscillate anymore. The driver circuit is tuned not at the resonance frequency of the primary coil, but on the secondary instead. In Fact the secondary coil has an inductance (quite obviously) and some parasitic capacitance, that's make the coil a LC oscillator. Remove the capacitance, the oscillator won't work doesn't matter how much power you pump on it. Hope this helps

cpaltenghe

10 years ago

Has anyone build a physical implementation of this?

bluefire007

10 years ago

I cannot see where on the circuit the 100 kVolts is being measured?

bluefire007

10 years ago

Never mind - found it. Nice!

hurz

10 years ago

Secondary side is unloaded. Put 100MOhm and see what happens. The load does change the impedance seen from primary side and cause fail to resonate! You have then to retune to a different frequency. Anyway, making coupling coefficient more realistic and use a 1MOhm load results by good finetune still to little less then 3kV. http://everycircuit.com/circuit/5213763819536384

WTFCircuit

10 years ago

There is still the most important thing in a tesla coil missing

thebugger

10 years ago

Yes the primary has a high Q factor, and any loading of the secondary will throw it off resonance due to reflected impedance, but that doesn't mean you can't tune the oscillator to the new resonant frequency. It's gonna take some trial and error but in the end given enough patience and perseverance you'll get it right. By the way I'm not sure if the secondary needs another resonant circuit, because the primary is already fine tuned, and the secondary just boosts the voltage. As the headline says Tesla coil or Something. This is mostly something :D

hurz

10 years ago

Lets called it "Werner von Siemens" coil and wtf will argue its a Tesla invention ;-)

WTFCircuit

10 years ago

No I wan't argue ;-p, tesla toke some tecnologies already existing to make a new one. Thebugger, if it is ment to be something it's ok, but if it is ment to be a tesla coil the secondary capacitance has to be considered ;-) . Also if you wan't to make it self tuned just add some sort of feedback :-D

thebugger

10 years ago

Well I'm not aware of how it historically the invention was laid, but almost all high frequency high voltage coil experiments can be traced to Tesla. Von Siemens probably perfected it. Of all the scientists Tesla was really out of his time. The same cannot be said even for Einstein.

thebugger

10 years ago

WTF i don't know where you the notion that the secondary absolutely must be tuned, it's only sufficient to tune the primary and the secondary will just step up the oscillations to a sufficient level to start gapping. As long as the primary is tuned and there is nothing to change it's resonance frequency, everything is well. The secondary sometimes use a capacitive torus on the top, to increase the Q factor but it's not mandatory, and can be skipped. As i said the secondary capacitance must be cancelled as much as possible, or considered when designing the circuit.

hurz

10 years ago

Again, put 100MOhm at secondary and see what happens

bluefire007

10 years ago

I put a 100MOhm and 170MOhm (=370MOhms) in series in order to represent air. On the other end I observed an alternating current of +-639x10^-3 Amps and +-184x10^3 Volts and that gives us approximate 117576 Watts? [Could this be an over unity circuit or are we not taking into account _ _ _ _ _ , zero potentials or something]. I imagined a spark jump from one terminal to the other. Or the circuit has no solution....?

bluefire007

10 years ago

Or its me...

hurz

10 years ago

I calculated for 100,50,20 and 10MOhm => 1.2W,680mW,286mW and 145mW

WTFCircuit

10 years ago

Take a look at this: http://everycircuit.com/circuit/6103080116944896 just a first proof

jpoulin0901

10 years ago

Anyone notice the glitch current apparently flowing from the + side of the negative supply instead of from ground?

migs

8 years ago

Just lower the ground symbol so you deduction is right. By that your deduction about the glitch will be corrected.

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