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Old 6th December 2002, 03:55 PM   #1
hacknet is offline hacknet  Singapore
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Default IGBTs

I heard much about IGBTs.... can i substitute the mosfets in an amp for IGBTs? if it does does it work for BJTs like the MJ15003 as well?
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Old 6th December 2002, 06:36 PM   #2
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You'll notice that most of the companies that launched
IGBT amplifiers are now out of business.

There are some good reasons for this: search the forum
under IGBT
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Old 7th December 2002, 04:06 AM   #3
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Hello!

There are many valid reasons for NOT using IGBT in audio amplifiers. A IGBT is a MOSFET and a bipolar device etched on the same substrate. One of the more obvious drwabacks are the fact that you can NOT bias them independently.
Other probelms include matching probelms and so on........

There is however one reason for using them: novelty

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Old 7th December 2002, 09:03 AM   #4
hacknet is offline hacknet  Singapore
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i wan to use dem becuz dey juz sound nice as a name and are fairly cheap compaired to mosfets.....

im interested in building a class d sub wif dem since dey are cheap
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Old 7th December 2002, 04:41 PM   #5
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"im interested in building a class d sub wif dem since dey are cheap"

Go for it. IGBTs are of little worth for a linear amplifier due to poor seconday breakdown specs, they are designed for low speed switching.

Apex builds some switching amplifiers with IGBTs that do 5~10KW that are suitable for subwoofer use (20Khz clock). The SA18 is $181.55, not bad for 10KW!

Apex also builds some hi-fi designs with FETs and 250Khz clock

http://www.theriver.com/apexmicrotec...amps/sa18.html
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Old 8th December 2002, 03:09 AM   #6
hacknet is offline hacknet  Singapore
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the main question is still not answered?

can in interchange IGBTs with mosfets for the power stages?
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Old 8th December 2002, 06:19 AM   #7
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If you want an answer to your questions, you better tell us what your amp uses for devices and what IGBT you would like to use.

Anyhow, I see no valid technical reason for such a substitution.
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Old 8th December 2002, 09:06 AM   #8
djk is offline djk
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"the main question is still not answered?

can in interchange IGBTs with mosfets for the power stages?"

Yes, you can build an amplifier with IGBTs.

You can also put a saddle on a zebra and ride him to work too!

You are obsessed with IGBTs. They cost more than MOSFETs, are slower, and have no SOA.

The only valid use for IGBTs is high voltage, low frequency switching.
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Old 8th December 2002, 09:45 AM   #9
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If you want to use IGBT's then do it! You don't need the approval of people who say it won't work. If it turns out that it doesn't work as well as you hoped you will have gained useful experience and understanding. You will be able to speak with confidence and authority about this. Anyway, there are some pretty fast IGBT's like for instance Warp Speed ones available nowadays. AFAIK the SOAR is fet-like or thereabouts, not yucky bipolar-like. I have a pair of 600v 60amp 540w TO-247 yummies that I will try I my class A someday.

Go for it hacknet! Try it and see. If you like IGBT's that much, then psychology being what it is, provided it isn't downright rotten, you will probably enjoy the sound even more once you have these jiggers installed.
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Old 8th December 2002, 11:11 AM   #10
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Quote:
Originally posted by djk

You can also put a saddle on a zebra and ride him to work too!




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