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Solid State Disruptive Coil Spark Gaps

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LAN_403

Reaching

Fri May 26 2006, 12:46PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

okay, i got it to work on 600volts with my new tvs, scrs etc. it works fine and i get ca 5cm streamers from my test setup(with a 600volt igbt!) . but now i have a problem i cant fix. i cant put two boards in series with the modified shematic,. maybe someone can help me to find the bug, .

the next problem is, that i cant use the scrs to switch at its maximum voltage without gate connected, maybe some internal protection or so, so i need to trigger them at a certain voltage.

maybe itÂ´ll work like this

Terry Fritz

Fri May 26 2006, 11:39PM

Registered Member #393 Joined: Tue Apr 18 2006, 12:30AM
Location:
Posts: 297

Hi,

I never thought that the SIDACs might be hard for folks to get

I have about 45 of the 300V ones (

PN# 3000F1-ND) I could drop in an envelope(s) and send over there... Let me now if anyone needs some. We''ll just say small quantites are free

First come, first serve... If I run out... Well..., I'll have to think of something...

Write me a private message thing on this forum if you need some.

It takes about a week or two to get over there (like an eternity...). Include the "exact" mailing adress just like it needs to be on the mailing lable for your country. Make a picture if it is like in chinese or somthing

Let me know how many you "need". I'll just write it all off to R&D

I thought the IGBTs might be a problem... But we could bulk buy SIDACS on this side of the water and send them over if needed?? DigiKey has like 700 left...

The SISG.pdf file has like 700 downloads for this!!!! I can see SIDACs being in short supply

I know practically nothing about SCRs, so I can't help much there...

Cheers,

Terry

Steve Conner

Sat May 27 2006, 02:43PM

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

Terry,

Just about any component is hard to get when you don't have a credit card, and your dad can't be bothered ordering stuff from DigiKey for you. :P Whenever I've done projects for 4hv, I always try and use the most popular components I can, but still I get e-mails asking if they can replace the UCC37322 driver chip with two 2N3055s and a piece of wet string. Wet string because it's so hard to find resistors here in xyz country.

There's no getting round the fact that sometimes you need exotic components to do exciting things. I wouldn't worry about the component availability: if people are genuinely fired up to build the SISG, they should be able to manage little setbacks like not being able to find any SIDACs.

We have done 4hv.org worldwide bulk buys before, and if the SISG takes off, I guess we could end up doing a bulk buy of SIDACs and 1200V IGBTs?

HV Enthusiast

Sat May 27 2006, 05:12PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

wrote ...

There's no getting round the fact that sometimes you need exotic components to do exciting things. I wouldn't worry about the component availability: if people are genuinely fired up to build the SISG, they should be able to manage little setbacks like not being able to find any SIDACs.

Little setbacks, like not being able to find any SIDACs, usually lead to new innovations. That wet string might be the next craze in solid state Tesla coiling . . .

Steve Conner

Sat May 27 2006, 06:17PM

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

I thought you tried wet string for "Passive Current Limiting" in DRSSTCs a while back, but it never caught on.

Don't hit me, I just ordered your new book from Amazon.

On the self-triggering of SCRs: I went and looked up the datasheet for some Philips T0-220 SCRs I have here.

http://www.semiconductors.philips.com/acrobat/datasheets/BT152_SERIES_1.pdf

It says that the device can withstand 200A/us di/dt when it's triggered properly using the gate, but only 15A/us when it's self-triggered by overvolting from anode to cathode. And that self-triggering is "Not recommended". It only seems to work for the 400V and 600V models too, I guess the 800V one just asplodes.

Marko

Sat May 27 2006, 11:50PM

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

Could they be triggered by some kind of simple resistive divider on gate (if we are so glad to leave the zeners out) ?

Desmogod

Thu Jun 08 2006, 02:47AM

Registered Member #139 Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358

terry,
Is there any chance you can post the pcbexpress files for your pcb's ;)

Self Defenestrate

Thu Jun 08 2006, 03:08AM

Registered Member #87 Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191

Started breadboarding for a try, still looking for a good SCR though. I'll post results as they come along.

Terry Fritz

Thu Jun 08 2006, 08:23PM

Registered Member #393 Joined: Tue Apr 18 2006, 12:30AM
Location:
Posts: 297

Could they be triggered by some kind of simple resistive divider on gate (if we are so glad to leave the zeners out) ?

Maybe. You sort of need a "trigger" to charge the gate up and all. Perhaps just one SIDAC could be used and the others in the string replaced by resistors. Probably lots of ways of doing it.

Is there any chance you can post the pcbexpress files for your pcb's ;)

They are here under the main document:

Started breadboarding for a try, still looking for a good SCR though. I'll post results as they come along.

You can breadboard them fine. Just use heavy wire for the high current stuff.

Cheers,

Terry

Marko

Sun Jun 11 2006, 08:52PM

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

I got an idea: could the triggering be done trough a current transformer, so sidac's/SCR need to conduct only a little of current while rapidly turning IGBT on?

Or that may lead to delay and overvoltage again...?

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