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Registered Member #242
Joined: Thu Feb 23 2006, 11:37PM
Location: Erie PA
Posts: 210
The Parts:
The eletrolytics are 2400uF, 450V. The decoupling caps are 4uF, 1500V Oh and the igbts are only 2400V, 1200A rms.
First task was to fix the heatsinks. I got the pair of them from ebay for $50 a few years back. They're 16"x10". This is probably why they were so cheap:
Dave Marshall lives nearby, and his friend John was able to machine them pretty good. I had to clean them up a little bit with a sander.
I used some 1/2" copper pipe that I smashed flat with a hammer. A little primitive, but a heck of a lot cheaper than buying bar stock.
half of the electrolytics
Decoupling caps installed. This complicates the assembly a bit, I need to remove 6 of the electrolytics to connect them.
The H connection:
Just need to make the bus bars that will connect the electrolytic caps in series.
I have it all broken down right now. Going to clean everything up real nice and make the final assembly.
The bridge will mainly be used to drive a DRSSTC, but it'll be easy to drive other things with it.
Registered Member #242
Joined: Thu Feb 23 2006, 11:37PM
Location: Erie PA
Posts: 210
I do have a secondary and topload built:
the coil is 12.5" diameter, ~40" tall. Resonates at 34kHz IIRC.
Still need to build the primary. not really looking forward to it. I have my sources for the bricks. (I sit right next to the Power Electronics engineer. He lets me know whenever there is scrap material - Scrap being anything that isnt usable for production).
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
Wowzers... definitely the largest hobbyist H-bridge I've seen. The fact that there are IGBTs of this size implies that there probably are bridges of this size out there and the fact that a hobbyist was able to get hold of a bunch implies there are probably even bigger ones out there... somewhere. So, probably not the "World's Largest" but still runs circles around non-commercial bridges.
I'm really excited to see what you do with this!
Have you given thought to the MMC? That's going to be a bank-buster!
Registered Member #242
Joined: Thu Feb 23 2006, 11:37PM
Location: Erie PA
Posts: 210
I have 200 of theses:
They're the GE 42L series. 1200V, 0.68uF each. They aren't the 942C's that everyone loves, but they worked ok in the OLTC. I think I only paid $80 for all 200.
Yes, there are more powerful bridges out there. The IGBTs dont get much bigger than this though. The only larger IGBTs I've see/heard about is 3300V, 1700A RMS in the same package size. I'd guess that if you went larger, you'd have a hard time keeping the junction temp(s) down. The larger bridges have multiple bricks in parallel for each switch.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Hi Jrz126 thats a sweet coil, can't wate to se the results. Can anybody get the price on those through a desributer or is your source for theas caps private.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Did you ever get that coil working as a OLTC? Are those IGBTs fast enough for what you want to do? What will your power source be? Might need some decent cooling if the bricks aren't fast enough.
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H-Bridge (World's Largest?)
