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Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
If it is a classic SSTC driver, I would use mosfets. Switching times are much less than most IGBT's, and you will lower the losses due to switching transitions. I believe Steve has played around with some 80N50 MOSFETS that have held up through a lot of abuse, if you're going with a high budget, i'd consider getting some of these.
Registered Member #610
Joined: Wed Mar 28 2007, 09:44PM
Location: Middletown, RI
Posts: 110
MOSFET drive waveforms are similar for both turn-on and turn-off. IGBT's have a tail current during shut-off you need to be aware of. You really only need to start thinking about IGBT's once you move into the realm of higher voltages and more throughput.
Registered Member #478
Joined: Tue Jun 20 2006, 11:57PM
Location: Shrivenham, United Kingdom
Posts: 8
Is it not the case that at high currents the on-resistance of the MOSFET drain-source channel becomes significant in dissipating power (for increasing current, I^2R losses), while an IGBT has a fairly fixed VCE (3V approx.) and so the power dissipation is lower at these conditions? I guess this only really comes into play with DRSSTCs?
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Universal driver = sucks over a bigger range.
Design for an application... make up your mind already and just build it. Its stupid to use big IGBTs for a little coil that runs at high frequencies, likewise, dont use wimpy fets on a monster coil.
Now, if what you really sort of meant was "i want a SSTC driver for 100-2000W of power at < 250khz" then that is a perfectly good design criteria. But, if its more like "i dunno if i will drive a coil at 100khz or 1Mhz", then there really isnt going to be a solution that works great for both cases.
I too suggest MOSFETs if you are doing regular SSTC type stuff. Depending on your line voltage (120V or 240V) the IRFP260 and IRFP460 are pretty standard parts.
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MOSFET VS IGBT
