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10th August 2019, 20:58 #1
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voltage and current waveforms spark gap
Can anybody post current and voltage waveforms. Could not locate current and voltage waveforms of spark gaps found in ordinary tesla coils. The current avalanches between the electrodes  does this make it exponential as found in pn junction charts?

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10th August 2019, 23:01 #2
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Re: voltage and current waveforms spark gap
Falstad's animated simulator has a tesla coil in its Circuits menu. The run starts with voltage close to the level where spark occurs (10kV in positive portion of cycle. 10kV in negative portion).
The simulator portrays current direction and intensity.
The circuit is in the link below. (I created additional scope traces so that waveforms can be viewed more easily.)
Click to:
1) Open falstad.com/circuit
2) Load schematic in simulator
3) Run it on your computer
https://tinyurl.com/y3vkq234
It's easy to add more scope traces, or change component values. Rightclick and choose Edit, View in scope, etc.
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12th August 2019, 00:16 #3
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12th August 2019, 04:40 #4
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Re: voltage and current waveforms spark gap
You might look at publications from the "gaseous electronics"
conferences, the folks doing very high voltage power switches
using gas tubes. I'd bet somebody in that crowd has looked
at SPICE and/or behavioral modeling.
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12th August 2019, 13:28 #5
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Re: voltage and current waveforms spark gap
No, except for the name, it's not the same thing.
Easiest solution is to simply measure it. Because spark gap mechanisms (plural) are not fully understood. Therefore you can not find a simulation model that is actually useful, in the sense  yes you can simulate some stuff, but your real life circuit will behave very differently than the simulation.
And no to that one too. But you can use semiconductors to switch hv, try have a look at my Marx Generator post here https://www.edaboard.com/showthread....actuallywork
p.s. I eventually gave up on semiconductors and hv, too much hassle.Last edited by Swend; 12th August 2019 at 13:38.
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12th August 2019, 21:01 #6
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12th August 2019, 21:57 #7
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Re: voltage and current waveforms spark gap
Your question does not have a definitive answer. I can make a spark gap produce DC or AC (with or without harmonics) just by (thinking of) moving a wire, so there is really no substitute for a real life circuit. My advise is: learn how to measure voltage and current in a spark gap.
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13th August 2019, 02:44 #8
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Re: voltage and current waveforms spark gap
For an example of unusual waveforms in Tesla coils, there's the kind that sings:
"Dueling Banjos on musical Tesla Coils"
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13th August 2019, 07:10 #9
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Re: voltage and current waveforms spark gap
An ordinary spark gap for an ordinary AC tesla coil doesn't make loads of harmonics?

13th August 2019, 07:50 #10
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Re: voltage and current waveforms spark gap
No doubt about it. The purpose of a tesla coil is to "make harmonics", generate high frequency signals up to MHz from a low frequency power source. In so far the question is a kind of stupid. Just look at the spark gap I/V characteristic.
A different question is if a Tesla generator can be linearly modulated in a certain operation range. You may want to ask specifically.
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