Author Topic: What is the true in tuning guide?  (Read 188 times)

Offline VNTC

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What is the true in tuning guide?
« on: July 15, 2019, 10:01:21 AM »
The Tesla coil is as a function that has many variables, so it gives a lot of results, countless results. This problem makes it very easy to achieve average results but to get perfect results is very difficult.
This table helps to show great prospects for success, from these points it is hoped that just fine adjustment is enough.
Call:
F1=1/2π√L1C1 primary resonance frequency (static)
F2=1/2π√L2C2 static secondary frequency (static)
Ft=Tesla coil resonance frequency measure by oscillosope+antenna (dynamic)
F1 and F2 number by calculating or measuring while only one coil run seperately
√(L1.C1/L2.C2)=F2/F1 [/i](amount of split  frequency from F2 against F1) temporarily call slit factor from 1 to 2
Quick access good tuning point  table (DRSSTC, L2/L1=10000)

What is this table built by?
* F1 and F2 are parameters of each individual coil.
* When Tesla coil is physical formed (in coupled) F1 and F2 no longer exist, Ft replaces them, both coils run only on one frequency Ft regardless of light or heavy sparks.
* Run simulating the schematic and increase split  factor  from 1 to 2, the AC sweep curve to find the resonant frequency of the Tesla coil is the shape of the horse saddle including the upper and lower poles then gradually taking the nose shape that has only one resonant frequency point, the output power of the Tesla coil increases proportionally and then changes in the downward direction, at the highest point of this curve is a good tuning point. (points with the highest power output)
     Compare with common theoretical:
Quote from http://weber.itn.liu.se/~stegu/onetesla/onetesla_tuning_guide_draft.pdf
                                                    Getting into tune
 “Measure your resonance frequencies on minimum power, or on an unpowered coil using a signal generator and an oscilloscope. If you are lucky, your primary frequency is about 15% lower than your secondary frequency. In that case, you're basically fine. Your coil does not need any strong tuning adjustments. The reason for having different frequencies for the primary and secondary is that the secondary frequency will shift down somewhat during operation when there is a long spark present. That spark is a conductor that will add to the capacitance of the top load and reduce the resonance frequency by about 15%. See the section “Deliberate detuning” above.”
This way of speaking is present everywhere in the theoretical resources of Tesla coils 
In fact its nature is so, it is necessary to spilt up them first with an available split factor and then they will be unique after combining. Completely F1 and F2 are not unique by strong sparks.   The action of this tutorial is OK, but explains why to do it, it's not right.
Image 1: beginning of the spark from 13us to 23us the periods is 6.74us

Image 2: at the end of spark from 1130us to 140us the periods is 6.94us

*The frequency at the end of spark lower than frequency at the beginning of spark approx.  3%

Image 3: sine wave in primary and secondary are  the same 20 cycles in 140us, this image showF1 and F2 no longer exist, Ft replaces them.
Note:
*Number L2/L1=10000 is reasonable in terms of physical and final result. If it is become 5000 the output voltage and power output drops to 66% lower than before in almost the case. Row 1 and row 2 this number are 7500 and 6250bucause L1 cannot <4uH.
*For classic Tesla coil the number of column 3 maybe change a little.
* In the low-frequency area <80kHz, I have to change the load resistance from 5p to 10p or higher to get high power, there is no other way to do it. I think that sparks create their own power by increasing its capacitance according to its length or anything else that I don't know exactly.
* High inductance coils need higher power to run. So global use and higher DC bus.( Row 11, row12)
Thank you all guys.
Sicerely.

« Last Edit: July 28, 2019, 02:44:01 AM by VNTC »

Offline Mads Barnkob

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Re: What is the true in tuning guide?
« Reply #1 on: July 15, 2019, 02:48:02 PM »
Since it in practise works to detune the primary 10-15%, why is it your model only suggest that 3% should be enough, or that detuning is actually worse?

Detuning does make a Tesla coil produce longer sparks, but it also takes a almost full input power before any break-out is produced, but then it will suddenly lash out huge sparks, there seems to be some non-linear growth here that is missing in your model?
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline VNTC

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Re: What is the true in tuning guide?
« Reply #2 on: July 16, 2019, 05:11:21 AM »
Hi Mads,
I am happy and grateful on your reply.
I discovered that: while DRSSTC running, means self-oscillation. Tesla coil always in-tuned  regardless any reason outside, it is not depend on split frequency factor include load situation :no load or heavy load.
Here are some news:
*In the case of no load, the waves in L1 and L2 are in phase.
*When the load increase L2’s wave lead phase compare L1’s wave and approaching close 180 degree.
*Or with any value of split factor ( F2/F1)
*At any cases it’s always in-tuned.(only Ft control all)
These things I harvest by running my self-oscillation DRSSTC schematic. I absolute trust on ORCAD software because it construct base on fully arithmetic.
Image1=Resonance response curve of Tesla coil in 2 case with different split frequency factor

Image 2=blue wave in L1and red wave in L2 in the case heavy load

Finally
 Let me say: The idea that by inductance of spark, f2 will drops  near f1 later is the principle of the way to get good tuning. It is approved for hundreds of years. It is not true.
The shortest answer: in any case DRSSTC always is in-tuned  regardless of external reasons.
Thank you all guys.
Sicerely.
« Last Edit: July 16, 2019, 05:16:35 AM by VNTC »

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Re: What is the true in tuning guide?
« Reply #2 on: July 16, 2019, 05:11:21 AM »

 


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