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Registered Member #4107
Joined: Sun Sept 25 2011, 07:30PM
Location: London
Posts: 53
Hi there,
I am building a DRSSTC and have a query about the typical output voltage of these high and low side drivers... Vcc is 15V. I need to design a gate drive xformer for a brick, 100A, 1200v device. I have looked at curves and around 17V gate drive seems optimal. Hence, on top of the calculations I have already made about inductance and magnetising current, I need to work out the correct turns ratio based on the output voltage of these drivers.
First attempts blew up my IGBTs instantly through overvoltage, I suspect.
Many thanks. This is my third coil. I've already had successful builds of a large vacuum tube coil and also a modulated 4Mhz class D RF power amplifier design.
Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
I have run these driver chips with 1:1:1 GDTs with +- 15v output without any problem. Using a good ferrite core and about 14 turns of twisted 3-strand wire has worked well for me and given a good output waveform. Never fried an IGBT through gate overvoltage with this setup. Usually hard switching, overheating or some other failure. Having the correct gate resistor and diode is important though - there is a recent thread covering this topic in detail. Hope this helps.
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Output voltage from UCC37322/1
