Author Topic: Choke-Core as GDT?  (Read 542 times)

Offline Fumeaux

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Choke-Core as GDT?
« on: December 22, 2018, 10:07:29 PM »
Hi there!

This is my first real attempt at making a tesla coil. I already built a sgtc back in school when i was ~16, but now I wanted to build a sstc.


Now my question: Can you use a choke-core (mine is from a microwave) for a gdt?

As fas as the internet is concerned the answer is no, but i tried it, and my waveform looks like "The perfect gate drive waveform!", according to this website: http://www.richieburnett.co.uk/temp/gdt/gdt2.html
In attachment 2 you can see my gdt and it totally looks like a iron powder core. What are your thought on this. Are these all lies surrounding iron powder cores? What should I have expected?
The risetime from the bottom to the top is 200ns... Does the mean I'm gucci?

Waveform with one IRPF450's gate connected

My setup for now

My driver (the gerberfiles are at https://highvoltageforum.net/index.php?board=4.0 ;) )
« Last Edit: December 22, 2018, 10:10:34 PM by Fumeaux »

Offline Mads Barnkob

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Re: Choke-Core as GDT?
« Reply #1 on: December 24, 2018, 12:51:28 PM »
I would also assume that a choke ringcore from a random piece of electronics would be a iron powder core, but it is really impossible to tell from the look of it. It is only when they come "colour" coded that its easier to identify as one or another. I assume the microwave oven you got this from is a modern one with a high voltage inverter supply instead of just a HV iron core transformer?

The way to identify a core type is as you did, simply to test it and from the response the AL value or permability can be estimated. From the looks of your waveform this core should be fit for the application as GDT, there is a chance that they actually used a ferrite core with suitable permability in the microwave oven.

Waveform might look different once you have a load voltage across the C-E junction of the MOSFETs. But give it a try :)
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

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Re: Choke-Core as GDT?
« Reply #1 on: December 24, 2018, 12:51:28 PM »

 


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