Author Topic: Ferrite material for GDT SSTC/DRSSTC  (Read 245 times)

Offline thedark

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Ferrite material for GDT SSTC/DRSSTC
« on: May 05, 2024, 02:21:54 AM »
I'm looking at what kind of core material for the GDT but I haven't found much relevant information or they are hidden somewhere in there. How do I determine the size of the core, and how do I select its material. Can MnZn or NiZn be used or must it have a permeability that adjusts to the operating frequency of the TC?
I plan to run it between 300 to 400 kHz.
Also, the igbt that I plan to use is the IXGR50N60BD1, which has a gate voltage of +-20V. Can it be operated at 20v or should I be a little lower, like 18v?

Offline davekni

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Re: Ferrite material for GDT SSTC/DRSSTC
« Reply #1 on: May 05, 2024, 03:05:44 AM »
Quote
I'm looking at what kind of core material for the GDT but I haven't found much relevant information or they are hidden somewhere in there. How do I determine the size of the core, and how do I select its material. Can MnZn or NiZn be used or must it have a permeability that adjusts to the operating frequency of the TC?
    https://highvoltageforum.net/index.php?topic=1854.msg13949#msg13949
NiZn is rarely used below 1MHz due to higher loss.  Advantage for some cases is it's an electrical insulator at room temperature.  (But not when hot.)

Quote
Also, the igbt that I plan to use is the IXGR50N60BD1, which has a gate voltage of +-20V. Can it be operated at 20v or should I be a little lower, like 18v?
+-24V is fine if you want to push current.  20V limit is for high reliability under continuous use for years.  TCs typically operate for a few hours total ever.
Looks like an obsolete IGBT part.  Is it fast enough for 300-400kHz even with ZCS operation?  (And parts from EBay etc. are often counterfeit, so may be slower or not be robust at rated current.)
David Knierim

Offline thedark

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Re: Ferrite material for GDT SSTC/DRSSTC
« Reply #2 on: May 05, 2024, 04:28:40 AM »
Thank for the response, I found 9 of this in ebay say NOS but I dont know it fake or not   but that it waiting for payment, the seller have a lot of old type ic diode other https://www.ebay.com/itm/155355207170.

I see some TC esign with diferent IGBT but the time it similar

Offline thedark

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Re: Ferrite material for GDT SSTC/DRSSTC
« Reply #3 on: May 05, 2024, 04:49:39 AM »
What difference would there be, if I use the E core that comes in the SMPS or a C core from the old television flybacks? Is there a way to determine its permeability to know what material it is like you would with a ferrite toroid? And about the gate resistance, how do I determine its value?

Offline alan sailer

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Re: Ferrite material for GDT SSTC/DRSSTC
« Reply #4 on: May 05, 2024, 04:28:35 PM »
My two cents is neither would be a good idea. I have bought a fair number of old flybacks off ebay and the operating frequencies are all below 100kHz. The same goes for a typical switcher. I have seen a number of threads on this forum where builders have tried to use cores from switchers to run a tesla coil with bad results.

If you have a signal generator and a scope it's fairly easy to wind a sample transformers and judge for yourself...

Cheers.

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Re: Ferrite material for GDT SSTC/DRSSTC
« Reply #4 on: May 05, 2024, 04:28:35 PM »

 


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