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1
Dual Resonant Solid State Tesla coils / Re: TO-247 IGBT for DRSSTC
« Last post by profdc9 on November 12, 2018, 08:35:12 PM »
I have not used the transistors you are talking about but looking at the data sheet they seem to be limited to 280 A also.  I used the FGH60N60SMD on my DRSSTC, and two of those in parallel, to have a full bridge of 8 transistors total, and so far it has held up to all the abuse I have subjected it to.  According to the data sheet these only have 180 A peak pulsed collector current relative as compared to the transistors you selected, however, the maximum power dissipation and average collector current ratings are higher.  I'm not sure why it would be this way, as I would think that the average and maximum peak currents would scale together.  I have attached the datasheets for both for you to look at.  I have been intended to try a different IGBT with nearly identical characteristics to the FGH60N60SMD but unfortunately with lower maximum power dissipation rating because the FGH60N60SMD seems hard to get these days.

Dan

http://www.onsemi.com/pub/Collateral/FGH60N60SMD_F085-D.PDF

Hi Dan,
I know this post is a bit outdated,but do you remember if the 20N60A4D's had the 300A limitation?I just want to know the possibilities of my current SSTC setup for upgrading to a DRSSTC.My transistors are 30N60A4D's with a lower pulse current rating than the 20N60A4D's(240A and 280A) in a full bridge configuration.
2
Dual Resonant Solid State Tesla coils / Re: (DR)SSTC music MIDI files
« Last post by erdal on November 12, 2018, 08:08:45 PM »
The Alan Parsons Project Lucifer midi file for tesla coils, only 38 seconds, main theme


3
Dual Resonant Solid State Tesla coils / Re: My second DRSSTC
« Last post by erdal on November 12, 2018, 06:58:26 PM »
Hi Mads,
I could not record the video because I tried inside at the home. It's make very dangerous sparks :)) i just took some photos. I plans to record test videos outdoors
4
Vacuum tube Tesla coils / Re: Usable vacuum tube?
« Last post by kamelryttarn on November 12, 2018, 12:57:26 PM »
I stripped the transformer bobbin of the secondary windings. Beneath the filament winding there was an unknown winding but since I will only use it for the tube filament I removed that one as well. Can anyone explain the this bobbin has two separate sections for primary and secondary windings when I can usually only find bobbins with a single space for both windings? This one seem much easier to deal with as a hobbyist.
5
Dual Resonant Solid State Tesla coils / Re: My second DRSSTC
« Last post by Mads Barnkob on November 11, 2018, 10:43:50 PM »
Congratulations on a good full power run!

Did you get to record any video of it?

Your MMC upgrade will do you good for long run times and MIDI playing. Thanks for providing more pictures and details on the GDT/CT materials. That Ikea table makes for a good looking Tesla coil base!
6
Solid state Tesla coils / Re: SSTC II
« Last post by Mads Barnkob on November 11, 2018, 10:13:09 PM »
Those are some serious overkill capacitors!

To prevent inrush current, how about adding bleeder resistors to them? Which will also help empty them to a safe state after a few minutes: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/dc-bus-capacitor/

7
Laboratories / Re: Moving to a new lab!
« Last post by Mads Barnkob on November 11, 2018, 09:47:17 PM »
Nice equipment!  How do you like the Rigol scope?  I was going to get one but I heard some mixed reviews.

Did you ever get the solar panels set up?

That Rigol was probably the best value low end scope up until a year or so ago, but I'd look at the 4 channel Siglent SDS1000X-E units as an alternate option now - have not used one but it sounds like there are some very significant improvements vs the Rigol for not much more money.

After seeing the Rigol MSO5000 series on eevblog today, if you have 999$+239$ for waveform generator... thats one hell of a 4ch scope.
8
Dual Resonant Solid State Tesla coils / Re: TO-247 IGBT for DRSSTC
« Last post by Hydron on November 11, 2018, 11:51:56 AM »
Well I was thinking of using two half bridge boards together each as one half of a full bridge.  Are there any issues with having the two half bridges on different boards, as long as the input power connections are tightly coupled?  Or do they need to share the same DC Link capacitors on the same board?  It's harder to do the layout for 8 transistors and a full bridge on the small board, but I give it a go.

Dan
Laci's reply brought my attention back to this - I have done some thinking about this exact issue recently and have come to the conclusion that different boards are fine - you will get the full primary tank current flowing between them on the power connections, but this is a nice sine wave - no switching transients etc so just size the cable big enough and you're OK, no need to worry about anything other than big enough and not unnecessarily long (it will simply add to the primary inductance). The power connections between the boards are also another place to locate the primary CT - in my case with multiple parallel bridges and a split MMC, this turns out to be the most convenient location, with no high voltages (like will be present on both ends of the primary coil with a split MMC) to worry about.

Laci - I would pay more attention to the thermal resistance number than the small difference in Icm in this case - the 30 part is much lower than the 20 part, which indicated a larger die inside. And worst case if you pop the 30s you can try again with something different!
9
Dual Resonant Solid State Tesla coils / Re: TO-247 IGBT for DRSSTC
« Last post by Laci on November 10, 2018, 10:45:28 PM »
Hi Dan,
I know this post is a bit outdated,but do you remember if the 20N60A4D's had the 300A limitation?I just want to know the possibilities of my current SSTC setup for upgrading to a DRSSTC.My transistors are 30N60A4D's with a lower pulse current rating than the 20N60A4D's(240A and 280A) in a full bridge configuration.
10
Quarter wave is approximately correct, yes.  The wave velocity is lower due to geometry, and the characteristic impedance is much higher (which is mainly what we're after, as the impedance of corona and sparks as your only load is quite high).

If you enter typical dimensions here,
https://hamwaves.com/inductance/en/index.html (which was updated like just last week!)
you'll find the waveguide impedance figure, which is related.

Unfortunately it seems to give poor results for low frequency, tight wound coils (negative RS?), but the inductance is probably not too bad.

Wide range tuning is probably a sign of low Q and high coupling.  The minimum coupling is ~1/Q (less, and power is lost in the primary or recirculated in the supply, rather than coupled over), and if Q is limited by corona discharge, it can be pretty high (I'm not sure how much it actually is, and I'm sure it depends on breakout geometry and everything else).

Tim
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