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I am going to experiment with some igbts for my pi units,I can buy the igbt with or without antiparallel diode. Which do I need? I think without is what I need.
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In normal case “diodeless” IGBT is needed, added diode (now not inherent part of device like in MOSFET but externally added die) will just increase output capacitance without serving to any purpose. Excessive output capacitance is main reason why IGBT is not particularly good for this. High voltage rating is nice (1200V is usual, some 4 or even 9KV devices are around), CE saturation voltage is not, but mostly, output capacitance associated with large, (unnecessary) high current rated components is problematic. IGBT is nice for some brute force version maybe, otherwise some other alternatives may be better. -
The datasheets on International rectifiers website say otherwise,the generation 4 Igbt IRG4BC10* series has 30pf output capacitance,and the IRF740 has 220pf output capacitance.That is a 600v device compared to 400v for the irf740. and you can get a 1200v in a to247 package with 44pf output capacitance.I think igbts tail out at shut off,I am curious how that affects flyback.Originally posted by Tepco View PostComment
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IGBT'S are awesome
I've been using IR's igbt's on XPI for a while now and they do have advantages over mosfets - Like Brian pointed out they have less capacitance and the low on Resistance makes them ideal for this application.
The Bad... They burn out easily when not driven properly so do be careful..
@Brian I'll try to email you back on the boards etc tonight...
Jon
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