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Class D Switching Power Amplifiers and Power D/A conversion

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Old 16th September 2011, 12:27 PM   #1
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Default Largest Class-D amp ever?

Maybe the highest power amp ever insane 40.000Watts!!!
PKN 3PHASE power amplifier



THREE PHASE 400VAC POWER

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Old 16th September 2011, 01:12 PM   #2
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It would easily fit in the rack in my living room too. Bizar.
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Old 16th September 2011, 03:26 PM   #3
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Originally Posted by vacuphile View Post
It would easily fit in the rack in my living room too. Bizar.
Sweet! Now I know why I recently bought one of these 45kW diesel generators and put it in my living room. It came cheap, too at 30K$...
E
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Old 16th September 2011, 03:41 PM   #4
jez is offline jez  United Kingdom
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Much bigger valve amplifiers were once used for AM modulation of transmitters.
Seems rather unbelievable that such a small unit could give so much power....
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Old 16th September 2011, 03:49 PM   #5
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I have my doubts about this amplifier. Not available until next year?
A Class D amplifier has an efficiency of 85-90% at best.
This amplifier would need to dissipate between 400 watts (best case) and 1500 watts (worse case) in heat.
There is no way that a single rack unit amplifier can dissipate that much heat.
Even with a big blower to keep the chassis cool, there is not enough surface area to dissipate that amount of heat.
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Old 16th September 2011, 03:57 PM   #6
jez is offline jez  United Kingdom
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Quote:
Originally Posted by Frank Berry View Post
I have my doubts about this amplifier. Not available until next year?
A Class D amplifier has an efficiency of 85-90% at best.
This amplifier would need to dissipate between 400 watts (best case) and 1500 watts (worse case) in heat.
There is no way that a single rack unit amplifier can dissipate that much heat.
Even with a big blower to keep the chassis cool, there is not enough surface area to dissipate that amount of heat.
My thoughts exactly....
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Old 16th September 2011, 04:14 PM   #7
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My calculations were for a single channel of audio.
For the two channel version, the heat dissipation would be 2X.
For the four channel version, the heat dissipation would be 4X.
This must be a joke.
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Old 16th September 2011, 04:16 PM   #8
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As I informed those PKN amps has soft switching and fancy GaN transisitors so they have losses in most of the operation range as low as 1% in the endstages. It would mean 99% efficiency which is not unrealistics today (however VERY pricey)

I do not know what power supply they have but on other forums some guys who saw the internals mentioned "military technology"
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Old 16th September 2011, 04:19 PM   #9
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Quote:
Originally Posted by Frank Berry View Post
I have my doubts about this amplifier. Not available until next year?
A Class D amplifier has an efficiency of 85-90% at best.
This amplifier would need to dissipate between 400 watts (best case) and 1500 watts (worse case) in heat.
There is no way that a single rack unit amplifier can dissipate that much heat.
Even with a big blower to keep the chassis cool, there is not enough surface area to dissipate that amount of heat.
It would be quite doable with water cooling. Zalman used to sell a water cooler which had a separate radiator. This might make for an interesting DIY kit. (Backing the warranty on electronic equipment which has water cooling installed seems dicey to me.)
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Old 16th September 2011, 04:30 PM   #10
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Quote:
Originally Posted by Frank Berry View Post
I have my doubts about this amplifier. Not available until next year?
A Class D amplifier has an efficiency of 85-90% at best.
This amplifier would need to dissipate between 400 watts (best case) and 1500 watts (worse case) in heat.
There is no way that a single rack unit amplifier can dissipate that much heat.
Even with a big blower to keep the chassis cool, there is not enough surface area to dissipate that amount of heat.
What are you talking about. 1U rack servers are generally spec'ed at ~500W of heat dissipation, so there's no reason an amp couldn't be.
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