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Registered Member #793
Joined: Sun May 20 2007, 06:50PM
Location: Minneapolis, MN
Posts: 35
I am working on my first DRSSTC design and was wondering about separating the drive electronics, gate drivers, GDTs, pulse generators, from the power part, IGBTs, DC bus caps, TVSs. I have a few different types of IGBT modules and I like to be able to change from one to the other without redoing everything else. The 3 ways I have seen this done are: 1. Gate drivers on the same board as IGBTs with wires running to the drive/pulse generating circuitry 2. The break made with the GDTs, either the GDT is with the IGBTs and the primary wires of the GDT connect to the other PCB 3. or reversed with the GDT on the drive PCB and the GDT secondary wires run to the IGBT gates. I can see the best situation probably being #1 so that one is not introducing more parasitic inductance and picking up noise with extra wiring coming off the GDTs. But since I want the IGBTs swappable I would like as few parts as possible on the power PCB. #1 puts the most parts there. I understand that different IGBTs call for different drive circuitry but I'd just design the gate drives for the worst case (biggest) IGBTs and use it for all types.
Any opinions on this issue would be most welcome. Thanks.
Registered Member #793
Joined: Sun May 20 2007, 06:50PM
Location: Minneapolis, MN
Posts: 35
That is a slick design. Do you have a schematic available?
I don't have quite so awesome of IGBTs. I have a varity in TO-247, a few different half bridge bricks and a set of wierd package full bridges:25MT060WF I think I can build a pretty compact power section using that one.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
well hear is the scematic, the F/O reciever can be replaced with a hcpl-2601 opto. This design will work with other bricks. On the bench with resistive load I got rise and fall times around 400nS. I have been working on my own brick DRSSTC and have not tested in this application yet. any questions let me know N.B.
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DRSSTC design - separate power & drive
