Author Topic: Best core for GDT and FBT  (Read 2337 times)

Offline FilipŠebík

  • High Voltage Enthusiast
  • *
  • Posts: 34
  • Karma: +1/-0
    • View Profile
Best core for GDT and FBT
« on: January 09, 2018, 03:47:39 PM »
Hey, today I took my SSTC driver to school and probed the GDT on oscilloscope. The things I saw... I can't even explain how horrible the waveform looked. I just though that the bad performance of my driver would be caused by my interrupter, which I probed too and its very good looking.

GDT: So to the core type. As far as I've searched, I found this https://www.tme.eu/gb/details/tx42_26-3e25/ring-ferrites/ferroxcube/tx422613-3e25/
Nothing more. I know its against the rules, but if someone wants to take their time, they can find a core on this page https://www.tme.eu/gb/katalog/ring-ferrites_113555/ Where I can buy stuff from and this would be useful for everyone that is looking for a good core.

FBT: I found this https://www.tme.eu/gb/details/ppas100/current-transformers/talema/as-100/ I don't know if 1:50 ratio is good for FBT, but as I've seen on many schematics that they use 1:50 ratio, I though that it should be good. If it would be better to wind my own FBT, then this one? https://www.tme.eu/gb/details/tx42_26-3e25/ring-ferrites/ferroxcube/tx422613-3e25/ :DDD I know I posted this one for the GDT, but I think that its ok too :D

Thanks for help

Online Laci

  • High Voltage Engineer
  • ****
  • Posts: 203
  • Karma: +6/-0
    • View Profile
Re: Best core for GDT and FBT
« Reply #1 on: January 09, 2018, 04:26:07 PM »
I am using the TX42/26/13-3E25 cores as GDT,OCD,FBT.As GDT it works very well(150kHz),as OCD and FBT I did not tested yet.It also depends on the driver and the load.Why would you like to use FBT with primary feedback(right?!)instead of antenna or secondary base feedback?I am just interested. :)

Offline FilipŠebík

  • High Voltage Enthusiast
  • *
  • Posts: 34
  • Karma: +1/-0
    • View Profile
Re: Best core for GDT and FBT
« Reply #2 on: January 09, 2018, 04:35:02 PM »
I say, that thing that sucks the most is the antenna, so I want to replace the secondary feedback antenna with a FBT

edit:
Too bad... The TX42/26/13-3E25 core is not on stock... So I tried to find another one and I found this https://www.tme.eu/gb/details/tn25_15-3e25/ring-ferrites/ferroxcube/tn251510-3e25/ and this one https://www.tme.eu/gb/details/tn29_19-3e25/ring-ferrites/ferroxcube/tn291975-3e25/ I don't know if any of those are good or bad. This is my last resort, or maybe my GDT is wound bad? Its a yellow core from PC power supply. I wound huge amount of turns of a cat6 cable around it. I can bring the core to my school and measure it at thursday, but not earlier. I would wind less turns on it and even test some other cores that I have. I even have some flyback cores that I will use to wind my own flyback (more on that later) and I can test those too :DDDD Also I think that using flyback core is stupid but who knows :D
« Last Edit: January 09, 2018, 10:32:47 PM by Mads Barnkob »

Online Laci

  • High Voltage Engineer
  • ****
  • Posts: 203
  • Karma: +6/-0
    • View Profile
Re: Best core for GDT and FBT
« Reply #3 on: January 09, 2018, 06:28:28 PM »
The yellow core from the PC PSU is really bad for GDT,its made out of iron powder which is not good.I recommend you to check out my "SSTC (Not) Working Correctly" post.I had the same questions and got perfect answers to all of them.

https://highvoltageforum.net/index.php?topic=122.0
« Last Edit: January 09, 2018, 10:32:22 PM by Mads Barnkob »

Offline oneKone

  • High Voltage Engineer
  • ****
  • Posts: 249
  • Karma: +5/-0
    • View Profile
Re: Best core for GDT and FBT
« Reply #4 on: January 10, 2018, 12:49:13 AM »
I've been using n30 cores from rs components for my gdt , they seem to work well and are relatively cheap. The one I've been using is:
  https://au.rs-online.com/mobile/p/ferrite-rings/2120982/

« Last Edit: January 10, 2018, 12:52:05 AM by oneKone »


Offline futurist

  • Global Moderator
  • High Voltage Technician
  • *****
  • Posts: 116
  • Karma: +0/-0
    • View Profile
Re: Best core for GDT and FBT
« Reply #6 on: January 10, 2018, 03:13:30 PM »
3E25 material will work fine. I use same ferroxcube cores from TME for both GDT and CTs

Offline FilipŠebík

  • High Voltage Enthusiast
  • *
  • Posts: 34
  • Karma: +1/-0
    • View Profile
Re: Best core for GDT and FBT
« Reply #7 on: January 12, 2018, 07:31:19 PM »
Nice, the cores arrived and just waiting till Tuesday, so I can test them on oscilloscope in school. Any ideas on how many windings I should use? I say about 12-15, so 13 is fine I guess. And I won't test the TN14, TN13 and TN10 because they are too small. And I will make a new thread with links for the cores, scope pictures, frequencies used as well as some other things too.

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1013
  • Karma: +16/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Best core for GDT and FBT
« Reply #8 on: January 12, 2018, 09:02:04 PM »
I flipped through my file archive and found a spreadsheet I made back in 2013 to calculate GDTs. Some day I will convert it to a online calculator, but for now you can try it out here.

It is in openoffice format, I don't know if excel can open it?
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline FilipŠebík

  • High Voltage Enthusiast
  • *
  • Posts: 34
  • Karma: +1/-0
    • View Profile
Re: Best core for GDT and FBT
« Reply #9 on: January 13, 2018, 06:57:34 AM »
Thanks for the calculator, I calculated "Something" and came up with 13 turns on the primary. Duh what a coincidence that I predicted that :D

Offline Hydron

  • Administrator
  • High Voltage Engineer
  • *****
  • Posts: 231
  • Karma: +6/-0
    • View Profile
Re: Best core for GDT and FBT
« Reply #10 on: February 02, 2018, 10:48:39 AM »
This is what I used:
http://uk.farnell.com/epcos/b64290l0674x830/ferrite-core-toroid-n30/dp/1190604?st=n30%20toroid

I could only fit 5-6 turns on in my case, so I had to find something with higher Al (this has 5.75uH).

High Voltage Forum

Re: Best core for GDT and FBT
« Reply #10 on: February 02, 2018, 10:48:39 AM »

 


* Recent Topics and Posts

post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
Today at 09:01:29 PM
post Re: A dynamical arc model v2
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
Today at 08:54:41 PM
post Re: Bought huge capacitors
[Capacitor banks]
MRMILSTAR
Today at 04:34:02 PM
post Re: How energy flow through a DRSSTC?
[Dual Resonant Solid State Tesla coils]
Uspring
Today at 03:13:03 PM
post Re: A dynamical arc model v2
[Dual Resonant Solid State Tesla coils]
Uspring
Today at 02:40:06 PM
post Re: What happens when L and C are not matched?
[Electronic circuits]
klugesmith
Today at 01:17:36 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
Today at 11:13:33 AM
post Re: Where to buy Tesla coil capacitors?
[Spark gap Tesla coils]
Mads Barnkob
Today at 10:46:56 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Bert911
Today at 08:01:10 AM
post Re: A dynamical arc model v2
[Dual Resonant Solid State Tesla coils]
VNTC
Today at 04:19:07 AM
post How energy flow through a DRSSTC?
[Dual Resonant Solid State Tesla coils]
VNTC
Today at 04:05:33 AM
post Re: Tungsten
[Spark gap Tesla coils]
thedoc298
Today at 12:02:39 AM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Laci
June 16, 2019, 09:00:31 PM
post Re: Bought huge capacitors
[Capacitor banks]
dexter
June 16, 2019, 08:25:16 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
hightemp1
June 16, 2019, 07:06:48 PM
post Re: Bought huge capacitors
[Capacitor banks]
MRMILSTAR
June 16, 2019, 06:07:06 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Hydron
June 16, 2019, 04:51:26 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
June 16, 2019, 03:39:30 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
June 16, 2019, 03:39:15 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Hydron
June 16, 2019, 03:18:25 PM
post Re: A dynamical arc model v2
[Dual Resonant Solid State Tesla coils]
Hydron
June 16, 2019, 03:10:15 PM
post Re: Bought huge capacitors
[Capacitor banks]
Max
June 16, 2019, 12:25:59 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Bert911
June 16, 2019, 09:38:15 AM
post Re: Top of secondary
[Spark gap Tesla coils]
MRMILSTAR
June 16, 2019, 05:45:47 AM
post Re: Tungsten
[Spark gap Tesla coils]
MRMILSTAR
June 16, 2019, 05:40:52 AM
post Tungsten
[Spark gap Tesla coils]
thedoc298
June 16, 2019, 03:51:12 AM
post Re: Last question
[Spark gap Tesla coils]
thedoc298
June 16, 2019, 03:44:43 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
June 16, 2019, 12:03:50 AM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Laci
June 15, 2019, 09:27:30 PM
post Re: Advice sought for self build 15kV 50Hz 150mW supply
[Transformer (iron core)]
jonnie
June 15, 2019, 06:38:28 PM
post Re: Best way to discharge capacitors ?
[Capacitor banks]
MRMILSTAR
June 15, 2019, 05:49:12 PM
post Re: "LightningStorm" VTTC project
[Vacuum tube Tesla coils]
MRMILSTAR
June 15, 2019, 05:38:30 PM
post Re: Voltage Multipliers keep destroying drivers
[Voltage Multipliers]
MRMILSTAR
June 15, 2019, 05:19:35 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Bert911
June 15, 2019, 09:25:07 AM
post Re: Static electricity measurement
[Static electricity]
johnf
June 15, 2019, 08:47:17 AM
post Re: Brainstorming next coil sync, Async RSGTC, duel mot, or NSTs.
[Spark gap Tesla coils]
MRMILSTAR
June 15, 2019, 06:51:09 AM
post Power in/transfer/out in an original Tesla coil
[Dual Resonant Solid State Tesla coils]
VNTC
June 15, 2019, 06:49:06 AM
post Re: Rotoray spark gap motor power
[Spark gap Tesla coils]
MRMILSTAR
June 15, 2019, 06:35:48 AM
post Re: Are bleeder resistors necessary if I can easily discharge my capacitor?
[Spark gap Tesla coils]
MRMILSTAR
June 15, 2019, 06:21:45 AM
post Re: Last question
[Spark gap Tesla coils]
MRMILSTAR
June 15, 2019, 06:00:36 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
June 15, 2019, 02:00:16 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Bert911
June 14, 2019, 10:19:02 PM
post Re: Where to buy Tesla coil capacitors?
[Spark gap Tesla coils]
MRMILSTAR
June 14, 2019, 06:10:11 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
hightemp1
June 14, 2019, 02:38:13 PM
post A dynamical arc model v2
[Dual Resonant Solid State Tesla coils]
Uspring
June 14, 2019, 01:18:38 PM
post Re: Advice sought for self build 15kV 50Hz 150mW supply
[Transformer (iron core)]
Mads Barnkob
June 14, 2019, 10:15:41 AM
post Re: Advice sought for self build 15kV 50Hz 150mW supply
[Transformer (iron core)]
ritaismyconscience
June 14, 2019, 05:29:40 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
June 14, 2019, 12:24:48 AM
post Re: Advice sought for self build 15kV 50Hz 150mW supply
[Transformer (iron core)]
profdc9
June 13, 2019, 11:40:49 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
hightemp1
June 13, 2019, 10:22:12 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