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No limits to DRSSTC

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Marko

Tue Mar 21 2006, 05:14PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

The components used in DRSSTCs (4000 series logic, power MOSFETs and gate drivers) really don't generate enough energy at high enough frequencies to make an average sized shielding box resonate like an antenna.

I agree with that, obivously most of interferences get in trough vridge (power rails, GDT...)
so inductance here must be minimized and proper decoupling used.

Still circuit is protected from electric field, EMI noise from sparks and sparks themselves.
Lots of coils use that and I saw no real trouble anywhere (at least it seems like that).

Finn Hammer

Tue Mar 21 2006, 07:55PM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

Steve Conner,

Would that by chance be the heart of Odin, The all Fragger

, you are holding there in your hand on that new avatar of yours?
A closeup would be much appreciated

Cheers, Finn Hammer

Mike

Tue Mar 21 2006, 08:04PM

Registered Member #58 Joined: Thu Feb 09 2006, 05:40AM
Location: Tri-Cities, Washington, US
Posts: 317

Were getting off topic here, but Finn, go to conners drsstc project thread

and you can click on the pictures for larger image.

Dr. Drone

Mon Mar 27 2006, 12:25AM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Posts: 1673

Steve Conner

Mon Mar 27 2006, 10:05AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Jeez! I saw a picture of that diode assembly before, but I never realised how big it was, until I saw it next to some CM600s! Err, what is it for though? You're running off single phase, and using SCRs for voltage control, so technically you don't need any diodes at all, just two SCRs.

I've been trying to figure out a cheap and simple way to run a DRSSTC off 400V three-phase power since one of the teslathon venues in England has it. The best I can think of is to use a six-diode bridge rectifier with a single phase SCR controller in one of the live wires, and a contactor in another live. The third live connects straight to the rectifier, and the neutral would not be connected at all (and the drive electronics would run off a 400V:15V transformer)

So the system would be soft-started and run at reduced power using just two of the three phases. Once you had the SCR controller up to full voltage, you would press the OMG button that operates the contactor and connects all three phases.

Finn: Yes it is, we can discuss it in the project thread, or I can send you the full size pictures.

Dr. Drone

Mon Mar 27 2006, 05:35PM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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ScotchTapeLord

Tue Oct 19 2010, 02:23AM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
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Just curious... what happened to this?

Dr. Drone

Tue Oct 19 2010, 03:27AM

Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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ScotchTapeLord

Tue Oct 19 2010, 04:19AM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
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Posts: 635

Thanks for the links, though they are nothing I haven't ogled several times over already! I had come across this topic in the past and was reminded of it when in an earlier thread you mentioned a DRSSTC running at 10kHz. I got excited and thought maybe you were getting back to this one, but then you said it would have small heatsinks which killed all my hopes.

I myself am designing a large DRSSTC, somewhere between the size of Steve Ward's DRSSTC II and your FATBOY, but am limited to what is available to me, so I just love following projects like this one for the sake of gaining a better understanding of design and stealing neat ideas all so I don't end up ducking for cover from silicon shrapnel on the first light and then having to spend money on replacing it. :)

I'm curious about the HF supply for this thing. The only way I could think of running such a device would be to make a "litz" style primary, with each individual primary wire having its own isolated section of the MMC, each fed by its own H-bridge. It would be like running multiple FATBOY primaries in parallel with one secondary... If you could pull that off, then it would truly prove that there are "No limits to DRSSTC"!

Goodchild

Tue Oct 19 2010, 05:39AM

Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795

If we get much bigger we may have to resort to making are own IGBTs!

I to have to admit I love to follow these large solid state projects.

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