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Registered Member #1407
Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
Dr. Quit The Dr. Thing! wrote ...
Hey Marko,
Thanks for asking! :P I did most of my coiling when I was a student and living at home with my parents. I had loads more spare time and energy because I didn't have to work for a living, and a big workshop in the basement and a garden to try things out that might catch fire...
I'm lucky to now have an engineering job where I make stuff for a living, but after a while I found that I couldn't be bothered trying to make even more stuff when I got home in the evenings. I still love engineering and I'm determined to make a career out of it, but I just can't do it every hour of the day!
The projects I've done at work are better than anything I've ever worked on here, but I can't talk about them since they're commercially sensitive.
I guess what I'm trying to say is, yes, I am probably getting too old for it, and it's up to people like you to carry on what we started! :P
maybe when you retire you will go back to coiling as new types of coil designes could be invented by that time
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Dr. Quit The Dr. Thing! wrote ...
I don't really have any desire for a big DRSSTC now, or anywhere to run one safely if I did, so this project is shelved indefinitely :P The H-bridge looked a bit dicey anyway.
And yes, I was just trying to express how metal my H-bridge was
I'll take the unused components!:P Just messin'...
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Guys, living in a flat Steve just doesn't have a place he can run such a massive and loud monster. Still it's not an excuse not to build some smaller and quiet VTTC's or SSTC's! :D
Just looking back at this, if I was designing a 'commercial' DRSSTC driver that needs to work under specs, I would:
- use commercial DC-DC converters on each driver board;
- use either commercial GDT's or optocouplers for drive signal transmission. This gets rid of voltage standoff problems as I think.
The homemade transformers may just work, but we can't forget that wire isn't rated for more than like 300V or so actually.
Recently Reaching had some problems with EMI acting on toslink receivers, and they are really unnecessary since voltage isn't really too high. They are also pricey. If I had to use opto it would probably just be some faster optocouplers.
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
It's not easy to build a DRSSTC in an appartment, but it isn't inpossible. I'm building my DRSSTC with a secondary hight of 1 meter in my bedroom But I have the oppertunity to run and test it at the TU/e
Registered Member #76
Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
Yep marco you´re right. ive had some problems with emi acting to the toslink receivers, but i solved the problem. for sure, you dont need to add a complete optical connection system like i did, and i said that a while ago. this is the first and last drsstc i build, using this really complex and expensive technique. i tried it and it works really good but you´re right. it isnt really worth the effort and trouble. fast optocoupled devices or well build gdt drives are the way to go.
i used toslink cause i wanted to try it out, nothing more.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
That was quick I'll have to have a proper read through the thread to catch up. Gate drive waveforms look fast, I'm guessing it's running reasonably cool even with hard switching?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The scope shot I just posted is of the H-bridge outputs, not the gate drive. It's only hard switching about 10A, but I remember Finn or someone tried the Semikron bricks and got nasty ringing even with no load, so I'm pleasantly surprised.
The plastic film bus caps undoubtedly help damp ringing with their huge capacitance and relatively high ESR, and also I'm using about 1us of deadtime, though it's not visible with an inductive load. And I guess maybe the 128 series bricks switch softer and/or have lower inductance than the 123s.
My only worry is that at full power the harmonic current might be enough to burn out the bypass caps. They're rated about 13A RMS each.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Steve Conner wrote ...
but I remember Finn or someone tried the Semikron bricks and got nasty ringing even with no load, so I'm pleasantly surprised.
You should "seem to remember" because the ones I had bad experiences with were some ancient Toshiba types, real crap!
The white Semikrons come highly recommended overhere: Daniels Diablo Tonnere uses them, although the 400A version, and they have been running like thoroughbred racehorses ever since.
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Odin The All-Fragger: a large DRSSTC
