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Old 28th January 2011, 01:02 AM   #11
CBS240 is offline CBS240  United States
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With that kind of power and current consumption, perhaps a class D amp working in class G operation to form an envelope to a linear amp would be the most efficient way to produce a low distortion arc welder, er, rather 1KW @ 2R. It just seems like a lot of extra heat to waste in using a totally linear amp for 1KW output power.
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Old 28th January 2011, 06:04 AM   #12
effebi is offline effebi  Italy
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Quote:
Originally Posted by CBS240 View Post
With that kind of power and current consumption, perhaps a class D amp working in class G operation to form an envelope to a linear amp would be the most efficient way to produce a low distortion arc welder, er, rather 1KW @ 2R. It just seems like a lot of extra heat to waste in using a totally linear amp for 1KW output power.
I agree completely. Unfortunately I never did a class D stuff. I will study that, I hope it should not be too different from some PWM drive.
Do you really belive that it is possible to reach 0.1 % THD that way? At a first look a class H seems to me more reassuring.
Thank you.
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Old 28th January 2011, 08:38 AM   #13
ontoaba is offline ontoaba  Indonesia
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CBS240 offering classG with classD as envelope and the amplifier is linear.
Like this:
Its only need +50V for +/-45V outputs.
The Composite / Hybrid- Linear + Switching Power Amplifier

Isn't it better to use 2x500W? or at least start with lower power first.
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Old 28th January 2011, 08:46 AM   #14
effebi is offline effebi  Italy
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Quote:
Originally Posted by ontoaba View Post
CBS240 offering classG with classD as envelope and the amplifier is linear.
Like this:
Its only need +50V for +/-45V outputs.
The Composite / Hybrid- Linear + Switching Power Amplifier

Isn't it better to use 2x500W? or at least start with lower power first.
The links you posted are very interesting.
What you mean 2 x 500 W? bridge? Parallel?
A i said, I do need 1kW on 2R, 65-0-65 rails.
I am not afraid about hi-power, in other fields i was designing multi kW devices.
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Old 28th January 2011, 07:53 PM   #15
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