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Old 11th May 2006, 05:41 AM   #1
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Default Very High Voltage Amp Output Stage

I have seen a couple of companies online that produce very high voltage amplifiers (on the order of +/- 1kV output swing).

One such company is Trek Inc.

www.Trekinc.com

In their brochure, they give a block diagram as to how their product works, and if I may summarize it, the output stage is a bunch of cascoded mosfets (with a very high voltage bipolar supply) with each mosfet gate driven from an optoisolator.

==> I thought optoisolators were nonlinear; how can an output stage be driven from an optoisolator with the signal integrity still preserved?
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Old 11th May 2006, 08:27 AM   #2
djk is offline djk
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What use is it for you?

Their biggest model can only put out 400mA at ±1KV.

"Large Signal Bandwidth (2% Distortion)
DC to greater than 2.5 kHz."

"Small Signal Bandwidth (-3dB)
DC to greater than 20 kHz."

Model 30/20A
High-Voltage Amplifier

I use an AR Inc unit at work that can do ±15KV, but at only 3.5mA

There are some class D amps with IGBTs that can do ±1KV at several KW, maybe that's what you need?
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Old 11th May 2006, 08:56 PM   #3
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snip: rtarbell
==> I thought optoisolators were nonlinear; how can an output stage be driven from an optoisolator with the signal integrity still preserved?

Simply use feedback!
More serious is that they are noisy!

snip: djk
Their biggest model can only put out 400mA at ±1KV.

Trek is THE company for high voltage amps:
http://www.trekinc.com/products/+5kV.asp
http://www.trekinc.com/products/5-80.asp
for example!

Regards
Heinz!
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Old 11th May 2006, 10:48 PM   #4
gerhard is online now gerhard  Germany
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Quote:
Originally posted by powerbecker
snip: rtarbell
==> I thought optoisolators were nonlinear; how can an output stage be driven from an optoisolator with the signal integrity still preserved?

Simply use feedback!
That moves the problem from the forward to the feedback path only.

regards, Gerhard
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Old 11th May 2006, 10:52 PM   #5
Eva is offline Eva  Spain
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Check out size and weight of model 5/80 (the one from second link)
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Old 12th May 2006, 12:07 AM   #6
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[QUOTE]Originally posted by gerhard
[B]

That moves the problem from the forward to the feedback path only.

No, because the FB-path is DC-coupled the whole amp get much more linear, but the noise is still there.

Regards
Heinz!
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Old 12th May 2006, 12:25 AM   #7
gerhard is online now gerhard  Germany
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Quote:
Originally posted by powerbecker

No, because the FB-path is DC-coupled the whole amp get much more linear, but the noise is still there.
[/B]
If a dc connection is ok for the feedback path, why do you
need an opto coupler for the forward path in the first place?

regards, Gerhard
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Old 12th May 2006, 12:47 AM   #8
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Quote:
Originally posted by gerhard


If a dc connection is ok for the feedback path, why do you
need an opto coupler for the forward path in the first place?

regards, Gerhard

Gerhard,

I don´t need it but they use it

On the other hand if noise is not the issue I think also that this is a simple way to steer a long chain of c 1200V N-igbts/mosfets EQUALLY at high slewrate!

Regards
Heinz!
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Old 12th May 2006, 01:18 AM   #9
CBS240 is offline CBS240  United States
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electrocuted by the output of an audio amp....what a way to check out, eh? Just hope it's a tune you like
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Old 13th May 2006, 06:02 AM   #10
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I know that these high voltage amps are not exactly audio quality, I was just wondering how to drive an output stage using optoisolators. How would they be connected?
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