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Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
HI all, im back! I have been busy for the past couple months doing schoolwork and getting other things done. Im back with a big DRSSTC build.
The specs are: Bridge, full bridge of CM300DY-24H igbt's Primary, 6 turns of 5/8" soft copper tubing Secondary, 12"x48" wound with #24 double build mmc, .6uf 9kvp (good for 1500A) Lots more info to come as it goes along but so far it's going very good and today i tested the bridge with some test GE caps that blew out very quickly of course but was quite amusing to watch Here are a load of pics as i constructed the bridge. I will be adding more pics and info as i go but any feedback, questions or comments are welcome.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Very nice!! Just a question about your GDT though, do you think the off centre approach is a good idea? Would this create problems with the extra inductance on one leg of the bridge? The wires look a little long on one side to me. Great work though, it's going to be a monster kick ass coil!!
Registered Member #347
Joined: Sat Mar 25 2006, 08:26AM
Location: Vancouver, Canada
Posts: 106
Great Bridge! Are you running voltage doubled 240V, or just rectified?
Some suggestions:
You may have problems driving large IGBTs with a GDT like you're using. I'd suggest making two GDTs, or at least have two Cat5 cables around one core. Then use two pairs for each individual IGBT. The two IGBTs in each half bridge must be driven by one Cat5 cable to keep the windings coupled properly. Also, a larger core area and less turns is preferable to keep inductance down.
It's also critical to keep the leakage inductance between windings to a minimum to prevent shoot-through. To do that, cut all the GDT primaries as close to the transformer as possible, and connect all 4 windings directly in parallel at that point. Then from that run 4 parallel twisted pairs to your driver board. So in total, you'll have 8 pairs going from your driver board to the GDTs.
As Coronafix said, the GDT wires should all be the same length to ensure balance.
For your current sense transformers, you can use just one core around the bridge output wire, then run the secondary of that through all the 2nd stage transformers. Since it's current fed you can do this without problem.
If I haven't explained anything well enough, please let me know and I'll try to do a better job.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Hey guys, thanks for the kind comments. I got some more work done with the coil. The CDE capacitors came so i built the MMC and started doing some real power tests.
Here is a picture of my setup right now
Right now i have not pushed more then 620Ap through it because i am running on 120vac(350vdc) on the bridge. Here is the primary current waveform
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Big DRSSTC
Here are a load of pics as i constructed the bridge.
