Author Topic: mini tesla (hopefully not a fail)  (Read 9182 times)

Offline bogdan

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Re: mini tesla (hopefully not a fail)
« Reply #80 on: March 27, 2021, 08:13:27 PM »
sure

gates first 2, and i replaced the led modules with a coil, 3rd and 4th picture




Offline davekni

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Re: mini tesla (hopefully not a fail)
« Reply #81 on: March 27, 2021, 09:29:42 PM »
I'm assuming the actual scope scale is 20V/div, not 2V.  If so, the waveforms look acceptable.  GDT appears to be wired correctly.

For looking at waveform shape details, it is easier if one cycle fills more of the screen.  For example, if your scope can do this, 2us/division horizontal and 5V/division vertical.  In cases where 5V/division causes waveforms to extend off-screen, then change to 10V/div.

The spikes on half-bridge output (third image) are likely due to VBus wiring inductance.  They cause no issues at low voltage, but need to be checked at higher voltage before going all the way to 320V, making sure spikes don't get past the FET's 500V rating.  If you change to the parallel-plane layout, those spikes should be much lower.

Good luck with the new UCC chips when they come!
David Knierim

Offline bogdan

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Re: mini tesla (hopefully not a fail)
« Reply #82 on: March 27, 2021, 10:14:09 PM »
Yes, the probe is set to 10-1, I am glad to hear everything is on the right track. I will post new tests when the new UCC arrive.

Offline bogdan

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Re: mini tesla (hopefully not a fail)
« Reply #83 on: April 01, 2021, 02:40:44 PM »
My new UCC arrived, they are ok, the enable pin works, also i put the coil in the setup, powered with 30v. However, the antenna has to be really close to the ground part of the secondary in order for the coil to oscilate, and the ground leeks a lot of corona, so much that on the top i can't draw any arcs

Offline davekni

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Re: mini tesla (hopefully not a fail)
« Reply #84 on: April 02, 2021, 05:24:17 AM »
If you are getting corona at the ground end of your secondary, then there is a problem with the connection of the bottom of the secondary to ground.  There should be almost no voltage at the bottom end of the secondary.

Make sure you test both polarities.  Swap wires on either the GDT primary or Tesla coil primary to invert phase.  One phasing will work much better than the other.  Often one phasing does not oscillate at all.
David Knierim

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Re: mini tesla (hopefully not a fail)
« Reply #84 on: April 02, 2021, 05:24:17 AM »

 


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