Author Topic: Corona on the.... GDT??  (Read 317 times)

Offline nick

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Corona on the.... GDT??
« on: November 29, 2019, 12:40:05 PM »
Weird experience I had yesterday. I built a GDT for a full bridge but was testing it on my half bridge. The coil worked as expected (albeit I mostly test at voltages ~45v) but I spent probably 15 minutes trying to figure out where the sound of a second spark breakout was taking place (in addition to the breakout point). I was then surprised to notice that the sound was coming from the GDT (with 2 coils left open) and even more surprised to see a light corona between the wires... it was weird but kind of pretty.

Anyway when I connect it to the full bridge, this effect disappears (unfortunately the coil itself doesn't work but that's another story....).

I'm guessing the disconnected windings are acting like antennas? Interesting that it doesn't seem to negatively affect the performance of the half bridge....

Offline Weston

  • High Voltage Enthusiast
  • *
  • Posts: 41
  • Karma: +2/-0
    • View Profile
Re: Corona on the.... GDT??
« Reply #1 on: December 01, 2019, 12:14:57 PM »
Is your driver circuit grounded? Are you using antenna feedback? The secondary wires are close to the primary windings so the electric field for the two should be ~ the same, so unless things are really wired weird I don't think the unconnected windings are acting like an antenna. If you wanted to eliminate this as a cause you could connect one side of the unconnected GDT winding to a connected winding.

The secondary side of the GDT is referenced to the inverter, which has low impedance paths to defined voltages. Any voltage is likely between the primary and secondary, which means your driver circuit could be floating referenced to the inverter. Are you using a separate power supply for the driver? Is there a common ground or something?

High Voltage Forum

Re: Corona on the.... GDT??
« Reply #1 on: December 01, 2019, 12:14:57 PM »

 


* Recent Topics and Posts

post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
ZakW
Today at 04:17:27 AM
post Re: Power MOSFETs with fast recovery body diodes
[Electronic Circuits]
John123
April 08, 2020, 11:40:04 PM
post Has anybody got this board?
[Solid State Tesla Coils (SSTC)]
TMS
April 08, 2020, 10:34:42 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
April 08, 2020, 07:53:19 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 08, 2020, 04:15:12 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
April 08, 2020, 01:05:28 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
SteveN87
April 08, 2020, 12:53:15 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 07, 2020, 10:54:57 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
April 07, 2020, 10:24:16 PM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
ZakW
April 07, 2020, 09:22:16 PM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
johnf
April 07, 2020, 09:04:34 PM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
ZakW
April 07, 2020, 08:48:01 PM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
Weston
April 07, 2020, 08:15:43 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
April 07, 2020, 06:23:47 PM
post Re: Where is plasma globe arc arcing to?
[Beginners]
John123
April 07, 2020, 05:59:09 PM
post Re: Where is plasma globe arc arcing to?
[Beginners]
alan sailer
April 07, 2020, 04:30:26 PM
post Re: Powerful easy to build MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
April 07, 2020, 01:10:30 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
SteveN87
April 07, 2020, 12:44:56 PM
post Re: Where is plasma globe arc arcing to?
[Beginners]
John123
April 07, 2020, 07:05:30 AM
post Re: Where is plasma globe arc arcing to?
[Beginners]
Jun
April 07, 2020, 06:40:02 AM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
ZakW
April 07, 2020, 05:07:31 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
April 07, 2020, 03:38:12 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
SteveN87
April 07, 2020, 03:21:55 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
April 07, 2020, 02:59:28 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
davekni
April 07, 2020, 02:52:19 AM
post Re: Small DIY plasma globe using ZVS oscillator
[Transformer (Ferrite Core)]
John123
April 07, 2020, 02:29:21 AM
post Re: Where is plasma globe arc arcing to?
[Beginners]
John123
April 07, 2020, 02:21:55 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
April 07, 2020, 02:00:26 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
SteveN87
April 07, 2020, 01:25:47 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
April 07, 2020, 12:38:59 AM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
petespaco
April 07, 2020, 12:13:11 AM
post Re: Corona lockdown thread, tell about your situation
[General Chat]
John123
April 06, 2020, 10:07:59 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
davekni
April 06, 2020, 10:07:11 PM
post Re: Corona lockdown thread, tell about your situation
[General Chat]
Mads Barnkob
April 06, 2020, 09:57:29 PM
post Re: TVS diode selection for 400v transistor
[Electronic Circuits]
John123
April 06, 2020, 08:04:52 PM
post Re: Power MOSFETs with fast recovery body diodes
[Electronic Circuits]
John123
April 06, 2020, 07:49:30 PM
post Re: Where is plasma globe arc arcing to?
[Beginners]
davekni
April 06, 2020, 06:30:24 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 06, 2020, 06:23:27 PM
post Where is plasma globe arc arcing to?
[Beginners]
Jun
April 06, 2020, 02:10:18 PM
post Re: Interuppter code help for sstc (LONEOCEANS SSTC2 )
[Solid State Tesla Coils (SSTC)]
Max
April 06, 2020, 10:21:47 AM
post Journey to a small stand alone CW signal synthesizer
[Radio Frequency]
Da_Stier
April 06, 2020, 09:56:07 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
April 06, 2020, 05:09:29 AM
post Re: Class E SSTC Topology
[Solid State Tesla Coils (SSTC)]
ZakW
April 06, 2020, 02:26:28 AM
post Re: Skm100 coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
oneKone
April 06, 2020, 02:16:56 AM
post Re: Portable Q(uarantine)CW Tesla Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 06, 2020, 12:43:50 AM
post Portable Q(uarantine)CW Tesla Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Weston
April 05, 2020, 10:47:07 PM
post Re: Unconventional 3kW SSTC
[Solid State Tesla Coils (SSTC)]
davekni
April 05, 2020, 10:46:48 PM
post Re: Interuppter code help for sstc (LONEOCEANS SSTC2 )
[Solid State Tesla Coils (SSTC)]
Max
April 05, 2020, 10:09:40 PM
post Re: Interuppter code help for sstc (LONEOCEANS SSTC2 )
[Solid State Tesla Coils (SSTC)]
ritaismyconscience
April 05, 2020, 09:55:33 PM
post Re: Royer oscillator (ZVS) driven Jacob's ladder, E80 core transformer
[Transformer (Ferrite Core)]
davekni
April 05, 2020, 06:53:57 PM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal