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Forums
4hv.org :: Forums :: Tesla Coils
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GDT getting hot

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dingo27
Tue Sept 21 2010, 08:12PM Print
dingo27 Registered Member #890 Joined: Tue Jul 10 2007, 10:06PM
Location: Slovakia
Posts: 180
 		My (iron powder) GDT is getting hot. I assume it is because there are some losses. But is it common that in more powerful tesla coils gdt gets hot? Should i fix it by replacing to something another?

its not hot much, but temperature rises and i think it should not.
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Luca
Tue Sept 21 2010, 08:22PM
Luca Registered Member #2481 Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
 		Iron powder is quite lossy at high frequencies (above few kHz...)

So, it is totally normal that at around 100kHz iron-powder cores get hot.

You should switch to ferrite core, which can be used up to 1MHz, at least...

Regards

Luca
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Dr. Dark Current
Tue Sept 21 2010, 08:42PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		Iron powder GDT? ill No, you really need ferrite for this task...
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dingo27
Tue Sept 21 2010, 09:42PM
dingo27 Registered Member #890 Joined: Tue Jul 10 2007, 10:06PM
Location: Slovakia
Posts: 180
 		i could only had iron powder, because ferrite ones are damn expensive here (1.5€ / piece, and i must get more...)

thats what i was most afraid of...

what ferroxcube material is better 3f3 or 3e25 ?

i can choose from

TN16/9.6-3F3 Toroidal ferrite core TN, material 3F3, 1160nH
TN16/9.6-3E25 Toroidal ferrite core TN, material 3E25, 3540nH
TN20/10-3E25 Toroidal ferrite core TN, material 3E25, 5340nH
TN25/15-3E25 Toroidal ferrite core TN, material 3E25, 5620nH this seems to be a good value
TN25/15-3F3 Toroidal ferrite core TN, material 3F3, 1840nH

3f3 is stated for 200-500kHz,
i cant find frequency range for 3e25

thing is - TC will be run somwhere between 300kHz to 1mHz, will that matter?
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Marko
Tue Sept 21 2010, 10:24PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
 		Hi,

I got my ferrite toroids here at really great place

Link2

they used to sell larger ones as well, although I found these more than enough for most applications.

Marko
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803
Tue Sept 21 2010, 10:30PM
803 Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
Location:
Posts: 191
 		Don't want to steal this thread, but Marko, do you think those cores are good enough for steves mini sstc. I think this would apply to the poster too.
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dingo27
Wed Sept 22 2010, 12:13AM
dingo27 Registered Member #890 Joined: Tue Jul 10 2007, 10:06PM
Location: Slovakia
Posts: 180
Marko wrote ...

Hi,

I got my ferrite toroids here ...

you sell it?
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HV Enthusiast
Wed Sept 22 2010, 02:38PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		You need to use ferrite. Iron powder is no good for a gate transformer core.
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dingo27
Wed Sept 22 2010, 09:54PM
dingo27 Registered Member #890 Joined: Tue Jul 10 2007, 10:06PM
Location: Slovakia
Posts: 180
 		Well, today i "buy in advance" 10 ferrite toroids, i just hope it will berform better :)

only thing i could choose was some 19mm 3f25 (i didnt go for 3f3, seems 3f25 has wider range), for some 4 euros, which was quite a good deal. They didnt had any bigger and ones i wanted will be available in february 2011, mad

i hope they will come unbroken.

Also i want to mention - i was quite surprised how well it can perform for a iron powder. I was running somwhere between 350-450kHz, and thats quite lot. But it coulndt handle smaller coils.
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Dr. Dark Current
Fri Sept 24 2010, 10:18PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		The toroidal cores from bigger SMPS line filters (common mode choke, two windings on one core) work very well for GDTs. They are ferrite with high permeability.
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