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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
I would use boath IGBT's and FET's in this application. In my expieriance I have been able to get 100ns fall times or less out of IGBT's with the right gate drive.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
teravolt wrote ...
I would use boath IGBT's and FET's in this application. In my expieriance I have been able to get 100ns fall times or less out of IGBT's with the right gate drive.
Is this in a resonant-switch converter topology? What happens to the tailing off period?
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
BlackPlasma I use the IXDD414PI as you are well versed with to drive my IGBT's and FET's. I have used them to do direct drive using 2 ohms or less gate resistance. In my CM600 driver I use 2 414PI's in paralell with about .5 ohms and a reverse doide in series with the gate to help turn off. I can get IGBT's to turn on and off faster than using gate transformers. The PCB's that I built have on board regulators and fiber optics for isolation and power witch I am going to use for a full bridge. the draw back to this setup is each CM600 gets it's own raw DC supply. You have done more with resonant-switch topology than I have done and it might be more advantages than direct drive. if anybody is inersted in a schematic let m know. N.B.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Is this in a resonant-switch converter topology? What happens to the tailing off period?
With mosfets, zero voltage switching is preffered because it discharges the output capacitance and minimizes losses with that part.
IGBT's are much better used as zero current switches because it as it forces collector current to zero and minimizes undersirable current tail. And this actually overcomes the drawback of output capacitance losses.
IGBT's used as zero voltage switches would not suffer from this loss, but would have a long current tail wich would 'poke' deep into next cycle and cause massive losses.
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Half-Bridge Flyback Driver: MOSFETs vs. IGBTs
