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Old 20th May 2007, 04:30 PM   #1
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Wink 1000w out offline flyback

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Old 23rd May 2007, 02:15 PM   #2
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Is it really possible to obtain such a high power with a flyback topology?
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Old 23rd May 2007, 02:59 PM   #3
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Sure, if you've got a BIG enough core, IGBT, and are using #0 battery cable for your secondaries.

Shouldn't the 68KW/220mF cap (R2C2) filter go to the HV DC Bus, and not one leg of the AC Mains?

Steve
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Old 23rd May 2007, 05:05 PM   #4
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Quote:
Originally posted by rejithcv
Is it really possible to obtain such a high power with a flyback topology?
labgruppen high power amplifiers using flyback smps
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Old 24th May 2007, 03:50 AM   #5
Eva is offline Eva  Spain
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Some component values are probably wrong. For example, mains filter capacitor can't be 100uF, it should be 1000uF or bigger.
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Old 24th May 2007, 03:57 AM   #6
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Evita, once you mentioned that Flyback is not good for KW power levels, but now i think your mind has changed after viewing the Lab Gruppen 10KW peak Flyback
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Old 24th May 2007, 09:47 AM   #7
Eva is offline Eva  Spain
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It may be scaled up, or several converters may be paralleled, but EMI performance and efficiency is still not good at such high power levels. Voltage and current stress on transistors and diodes is higher, and primary side and secondasry side silicon is not used at the same time, so silicon uitilization is 50% lower than push-pull. Also, the required transformer is considerably bigger and prone to leaking tons of flux...

Also, that 10KW amplifier does not actually use a 10KW flyback but more likely a 1-2KW one with current limiting. The rails should start sagging above a certain continuous power output. Note that tracking amplifiers are not only much more efficient than class AB with music signals but also achieve a considerable reduction in power consumption. Power efficiency of class AB with music seems to be around 10-20% (depending on how heavy the bass content is and how much compression was employed).
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Old 24th May 2007, 12:05 PM   #8
TOINO is offline TOINO  Portugal
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Quote:
Originally posted by Eva
Also, that 10KW amplifier does not actually use a 10KW flyback but more likely a 1-2KW one with current limiting. .

That is the R14 function of published schema (as you know much better than me).
Exactly the same principle is used on the refereed “10Kw” amplifier PSU, but with “R14” value adjusted for cycle by cycle current limiting.


Quote:
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(depending on how heavy the bass content is and how much compression was employed).
Hhmm.. Eva I appreciate when you are so reasonable and objective in your comments…
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Old 24th May 2007, 12:13 PM   #9
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Passive mains filtering/PFC ? No, thanks...
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Old 25th May 2007, 07:41 AM   #10
Eva is offline Eva  Spain
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Well, I forgot to mention that class D and rail tracking tend to exhibit 80-90% power efficiency regardless of the crest factor of the music signal, that's why those amplifiers can play high power music with a small PSU. Most of the power drwan from mains supply is just delivered to the loudspeaker. Plain class AB playing music tends to waste into heat 80-90% of the power delivered by the PSU.

PS: Get some reasonably sized class D module, like UCD180/400/800, and use it to play your favourite music into a full range speaker at clipping threshold. Then measure average current consumption.You will probably have a hard time believing how much class D music you can get out of, say, 50W PSU power.
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