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Old 9th March 2007, 08:52 PM   #21
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It is nice, Eva, but only in one polarity....
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Old 9th March 2007, 09:17 PM   #22
Eva is offline Eva  Spain
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The one polarity limitation is there too for power MOSFET and bipolar devices when blocking voltages in excess of 200-300V are required.
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Old 9th March 2007, 10:25 PM   #23
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Yes, it's true, but I mean that we aren't talking about kW amps or switching applications....
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Old 9th March 2007, 11:36 PM   #24
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Quote:
Originally posted by Eva
That's not completely true. The "MOSFET driving BIPOLAR" tale is only a popular way of explaining IGBT behaviour to straight people. An IGBT is a device having a single die and an unique structure which combines the advantages of MOS "channel" effect and bipolar "charge storage" effect. The absence of second breakdown is a consequences of this combination.

The following document shows the internal layout of old and new generation IGBTs and compares them to MOSFET for high voltage switching applications:
http://www.irf.com/technical-info/wh...c03nptigbt.pdf
Fair enough, but the reference only discusses the devices as
switches, so it really doesn't address any issues in linear use.

I have not tried these, but I have experience with the Toshiba
complementary devices circa 1989. I found that the matching
issues were real and I didn't see performance improvements that
justified the effort or cost.

Several companies rushed products to market, only to backtrack
after a period of time. Reliability appears to have been an issue,
perhaps not the fault of the devices themselves, and of course
the point became moot when the complementary parts were
discontinued.

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Old 9th March 2007, 11:58 PM   #25
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Quote:
Originally posted by Upupa Epops
Yes, it's true, but I mean that we aren't talking about kW amps or switching applications....

....eg. like this one with 192 x 310W IGBTs for a output of +/-400V @ +/-30A
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Old 10th March 2007, 01:53 AM   #26
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Quote:
Originally posted by powerbecker
....eg. like this one with 192 x 310W IGBTs for a output of +/-400V @ +/-30A
I believe that with that kind of hardware we could build a decent
IGBT amp...

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Old 10th March 2007, 02:52 AM   #27
Eva is offline Eva  Spain
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Quote:
Originally posted by Upupa Epops
Yes, it's true, but I mean that we aren't talking about kW amps or switching applications....
For lower power linear amplifiers we already have a wide choice of popular low cost high performance transistors. MOSFET devices excel when they are not required to block more than 200 volts, and audio bipolars have a nicely flat current gain as opposed to the square law of MOS devices. However, there is really little stuff for "KW" amplifiers.
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Old 10th March 2007, 04:07 AM   #28
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With series connections on balanced circuits with 200V devices
we can approach +/- 400V peaks, which is:

mumble..mumble...

10 KW rms into 8

20 KW rms into 4

40 KW rms into 2

Of course your real mileage will be less than that.

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Old 10th March 2007, 05:11 AM   #29
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Quote:
Originally posted by Nelson Pass
With series connections on balanced circuits with 200V devices
we can approach +/- 400V peaks, which is:

mumble..mumble...

10 KW rms into 8

20 KW rms into 4

40 KW rms into 2

Of course your real mileage will be less than that.

Can't plug that amp into a regular outlet. Standard 20 amp household receptacle only provides 2.4KVA @ 120 VAC. What kind of power supply do you use for an amp that big? A pole pig (distribution transformer)?
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Old 10th March 2007, 05:20 AM   #30
imix500 is offline imix500  United States
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Are the LabGruppen, Camco, Powersoft amps using these in thier topology to get thier crazy output power?
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