Author Topic: New small SSTC  (Read 2418 times)

Offline Bambinz

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Re: New small SSTC
« Reply #20 on: April 21, 2019, 08:59:56 PM »
News, now works, bad but works xD
The problem was the layout, I have made some connection too long duringe redesign (The connection between the capacitor and the primary coil). Now I have shorted all connection (are shorter also respect the first version). In addition, now the coil is above the coil and not away like in the version of the video.

However now I obtain a little spark and absorbe very high current, about 5-6A. Probably is due to the poor tuning of the C12 because I have used the old capacity, but the inductance of the connections and the parassitic capacitances are varied due to the change of layout.

Tomorrow I continue with the test!

Thank you very much !!!

Offline Bambinz

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Re: New small SSTC
« Reply #21 on: April 23, 2019, 08:18:17 PM »
Now work like in the first video, little bit better.

I have noticed that without interrupt the coil produce only 3mm-4mm of spark and consume a lot of current like 7-8A. The coil work very well with a low duty-cycle (betwen 0-10%).

I think that is due to the very low inductance of the primary coil (Only 1 turns) that results in an high peak-current because the reactance at the risonance is very low.

I think that this mini tesla coil work very well because:
  1. Low inductance of primary coil = High primary current and High ratio L2/L1 -> Higher voltage gain
  2. Very high coupling, probably will be in the range of 0.7-0.8. Therefore results in a very high efficiency and then the high coupling not cause problem because we use small power.

Offline Bambinz

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Re: New small SSTC
« Reply #22 on: April 24, 2019, 11:48:59 AM »
Today I have start-up again the tesla-coil without change anythings and .... MOSFET it dies :(

Therefore I have decided to reproject the driver, the new versions will be base on the the leonsocean schematic: https://www.loneoceans.com/labs/sstc2/  but with some modifications.

- 1) The secondary will be the same
- 2) The primary will have the same size and 1/2 turns (not 1+1 because will be used an half-bridge driver)
      I will use an high coupling and a very low primary inductance to have an high voltage gain and an high primary current. I think that is the key to obtain a good spark from  this small
     teslacoil
- 3) Use an STM32F1 to control all the system
- 4) The inductance of the primary will be in the range of 0.1uH -> At 1 MHz will be a primary reactance of 1 Ohm, therefore with 24V of supply will obtain like 24A that is to mouch, therefore I
       will limit the duty-cycle to about 10% to have an RMS current in the range of 2-3A maximum.
-  5) I would like to add a mosfet protection(Snubber and short-circuit protection) to not kill to many mosfet xD
-  6) Use a better mosfet that support higher voltage, to prevent the destruction. Therefore the driver will be drive an high capacitance mosfet respect the actual mosfet.

Other suggestions? Can be works?


Offline Bambinz

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Re: New small SSTC
« Reply #23 on: April 28, 2019, 08:30:39 PM »
I'am starting to project the new tesla-coil driver with some interesting features.
If you want and if you are interested I can open new thread with the description, schematic, layout and the software.

Offline Mads Barnkob

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Re: New small SSTC
« Reply #24 on: April 29, 2019, 10:43:03 AM »
I'am starting to project the new tesla-coil driver with some interesting features.
If you want and if you are interested I can open new thread with the description, schematic, layout and the software.

Yes, please do start a new thread for a new project, instead of updating your first thread :)
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline Roit

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Re: New small SSTC
« Reply #25 on: September 24, 2019, 03:53:08 PM »
Hi

I hope it's okay to ask a question. I've built the same coil but haven't been able to test it yet, my problem is getting the Hex code down on Attiny13. i have tried with arduinoisp unsuccessfully. How did you program your chip?

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Re: New small SSTC
« Reply #25 on: September 24, 2019, 03:53:08 PM »

 


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