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Old 10th December 2007, 10:33 AM   #1
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Default 150A 1000V bjt based amp possible?

Hello,
I found in a old ups 2 pair of npn power transistor.
I would build a quasi complementary class AB amplifier based on this transistor.
is it possible?

Fuji electric 2DI150D-100
Ic=150A, 300A (1ms)
Vce=1000V
Pd=1000W per transistor, isolated case
beta=100-3000.

Storage time = 15us with Ib1=3A , Ic=150A ib2=-9A.
are too slow?

thanks, sorry 4 my bad english
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Old 10th December 2007, 10:45 PM   #2
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What would you use for VAS, HOT's? With hFE = 5?

I wonder what their DC SOA looks like. Not to mention 150A and 1kV aren't going to be simultaneous values, as power dissipation would be in the 150kW range. Big heatsink.

Probably MOSFETs would be more effective.

Tim
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Old 11th December 2007, 01:07 AM   #3
Leolabs is offline Leolabs  Malaysia
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Wonder about the linearity of those BJTs.
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Old 11th December 2007, 03:30 AM   #4
djk is offline djk
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I'm willing to wager they are switching types with no safe area.
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Old 11th December 2007, 03:38 AM   #5
fizzard is offline fizzard  Canada
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What about IGBT? They probably suck in the linearity department though. Their input is like a MOSFET, but the low saturation voltage of a BJT.
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Old 11th December 2007, 09:45 AM   #6
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hfe vary from 100 to 3000
there are 3 transistor in darlington configuration.
the termal resistance is 0.125C/W

My problem is the storage time of 15us
whith Ib=-9A!!!!!

is good for audio application?

with a 1ohm resistor from base to emitter, what time is necessary to turn off?
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Old 11th December 2007, 10:17 AM   #7
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p.s.i dont know the linearity because this is a switching product
i tryed to add datasheet but is too big (380k)


if tstg of bjt is too high for audio app. i can dismantle an other ups, with a 1200V 300A 1800W igbt.
ton max = 1us
toff max = 1.5us

it's a good idea? igbt for audio?
it is necessary Vge=10V to turn on this igbt...
it's possible to use a quasi complementary class ab configuration with this igbt?

thanks
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Old 12th December 2007, 12:15 AM   #8
fizzard is offline fizzard  Canada
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Most larger motor drives operate below 3KHz.

With 1000 W disipatation you'll have a very small safe operating area relative to the current and voltage.

If it's BJT it should have alright linearity, even the switching ones are okay.

IGBT's could work. I used one as a pass device in a linear regulator. As far as I could tell it behaved just like a MOSFET. I've never seen them in audio though, except switching power supply.
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Old 12th December 2007, 12:10 PM   #9
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Quote:
Originally posted by fizzard
Most larger motor drives operate below 3KHz..

With 1000 W disipatation you'll have a very small safe operating area relative to the current and voltage.

If it's BJT it should have alright linearity, even the switching ones are okay.

IGBT's could work. I used one as a pass device in a linear regulator. As far as I could tell it behaved just like a MOSFET. I've never seen them in audio though, except switching power supply.
I think in original application these bjt work at 100hz (square wave output U.P.S.)
how can i calculate turn off time (tstg+tf) with Rbe=1ohm?
if i dont use Rbe there are any problem for audio application?

thanks
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Old 13th December 2007, 02:09 AM   #10
CBS240 is offline CBS240  United States
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I doubt these devices are designed for linear operation. I doubt you will recieve the results you anticipate.
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