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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
I making big DRSSTC full bridge, with large IGBT (600V 400A pulsed 1KA), so i need IGBT driver with negative shutdown. For it i madded SMPS with 3 different +15 0 -15 output (stabilized with 7815 and 7915). For signal i will use GDT transformer... so i need create diver with 0,5uS delay time, and don't delay turn off... also it will be nice to have Usat protection... The biggest problem, i can't use UCC's, because voltage between positive and negative is 30V... so how to make driver ??
And here is my IGBT does enough+15V at 1KA peak impulse ?? or mayne use +18 0 -18 gate driver voltage ??
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Use only one supply (+15V) with two UCCs connected to it, one inverting and one non-inverting, then connect the gate and source between the outputs. This will work as a gate drive fullbridge and allow you to put +15V and -15V on the gate relative to the source.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Dr. Kilovolt wrote ...
Use only one supply (+15V) with two UCCs connected to it, one inverting and one non-inverting, then connect the gate and source between the outputs. This will work as a gate drive fullbridge and allow you to put +15V and -15V on the gate relative to the source.
yes, i think to do same, but i don't know, how to drive two UCC bye using one GDT winding ??
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Linas wrote ...
yes, i think to do same, but i don't know, how to drive two UCC bye using one GDT winding ??
like I said, use one inverting (UCCx7321) and one non-inverting (UCCx7322) then connect the inputs together and drive from 1 winding. How fast do you need the response time? It would probably be more convenient to use a opto-coupler.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Dr. Kilovolt wrote ...
like I said, use one inverting (UCCx7321) and one non-inverting (UCCx7322) then connect the inputs together and drive from 1 winding. How fast do you need the response time? It would probably be more convenient to use a opto-coupler.
Hm i don't like opto-coupler, they aren't stable in such a things... i believe, that GDT don't give errors in DRSSTC diver,..., also, i can't get in my country fast opto-coupler
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
There have been hundreds of threads on this topic since DRSSTCs were invented. Steve Ward and I both have high powered discrete driver designs, and so do a few other forum members, and we all think our own design is best and the others suck So start by searching the archives, and looking at Ward's site.
My own driver is here: it has what you call "negative shutdown" (I think) and isolation by GDT. Anyone who thinks theirs is better, post here
Registered Member #1024
Joined: Sun Sept 23 2007, 10:56AM
Location: Northern NSW, Australia
Posts: 95
I have to agree with Anders here. I currently drive a fullbridge of Toshiba MG200 200A bricks, and am using a discreet GDT driver ( based on the fullbridge in Steve Wards new driver) , with my own two chip logic block. This descreet GDT driver stage will happily handle 50-60A peak currents. My GDT is wound using 4core shielded audio cable with the shield as primary and internal conductors as secondaries, on a BIG torroid from Surplus Sales of Nebraska. This works very well indeed with my main 71Khz secondary, in fact I can drive my 170Khz secondary with no problems. And really you cant get much simpler than this setup.
Having said that , your 3 channel smps looks great, a work of art! And It would be a shame not to use it
Pic of my bridge showing GDT:
Pick of my DRSSTC driver during construction (the top half of the descreet GDT driver is at top right the two D2pak p-ch fets are on the top of the pcb with the N-ch on the bottom side), see Steves new driver for schematics of this section.
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IGBT driver
So start by searching the archives, and looking at Ward's site.
