Author Topic: Unknown part of original Tesla coil  (Read 1741 times)

Offline VNTC

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Unknown part of original Tesla coil
« on: July 22, 2019, 02:44:17 AM »
Let's join the trip to discover what happens in the Tesla coil when the C1 discharges into L1 and 50us after that. By running the simulation on OrCAD 9.2 lite, we can observe everything, anywhere in the circuit diagram that it runs.

Hard ware and parameters:
 L2*C2=150mH*20pFf2=91.88kHz (static)
L1*C1=15uH*200nF(and  260nF)
K=.2
Primary total resistor .05(in fact may be higher)
Secondary AC resistor 500( depend on wire diameter)
High voltage supply 10KV DC
Learning 1 bang created by discharge from C1
Image 1= overall energy in and out

Image 2= Output power 540KW peak max. (in the case L2*C2/L1*C1=1)

Image 3Output power 700KW peak max. (in the case L2*C2/L1*C1=1.4)
 Image 4 L1’s wave &L2’s wave, amplitude was adjusted to observe and compare period more easy, green wave= in primary; red wave in secondary (in the case L2*C2/L1*C1=1)

Table 1 data for image 4 from 4us to 46us only in 4 cycles the coil runs on 4 different frequency in L1, it change by increase way; in L2 it change by decrease way
Image 5 L1’s wave &L2’s wave, amplitude was adjusted to observe and compare period ,green wave= in primary; red wave in secondary (in the case L2*C2/L1*C1=1.4)


 Table 2 data for image 5
Table 2 shows their frequency decrease together.
Highlights:
1-In classic Tesla coil there is one loose coupling K, So L1 and L2 can run on different frequency.
(In DRSSTC there is an additional coherence: circuit loop to maintain oscillation, second element fastens them, so they only run on one frequency)
2-About amplitude, power output in table 2 higher than power output in table 1is 25.62%
3-About frequency, cannot find out the frequency unifying in both case. Only one time in column 5 table 2 but it is not importance because the amplitude at that moment is very low.
Let’s look again 
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.”
Finally, I think we should better do not forget the main purpose of tuning is find out the point that the coil running with best performance. The idea that try to make f2 (static)= f1(static) leading to right action but wrong thinking and wrong understanding. Is this a unknown part of original Tesla coil?
« Last Edit: July 22, 2019, 03:04:31 AM by VNTC »

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Unknown part of original Tesla coil
« on: July 22, 2019, 02:44:17 AM »

 


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