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Old 1st March 2005, 02:17 AM   #11
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Default DC -DC DC-AC SMPS SUPER POWER

THIS HOLA IS MY TO THINK FOR 3 PHASES I FOR SYMMETRICAL, THESE ARE MY DESIGNS. YOU THEMSELVES THINK. WITH SG3525Y IRFZ44H
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Old 16th March 2005, 04:26 AM   #12
Alme is offline Alme  Ukraine
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Default I have just received a new PFC solution from IR news

http://www.irf.com/whats-new/nr050307.html
Looks attractive.
'One cycle control' is something new to learn.
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Old 16th March 2005, 04:49 PM   #13
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Default New PFC Chip

Alme-

I agree. It looks promising, and could really simplify the design of the PFC Pre-converter stage.
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Old 18th March 2005, 05:26 PM   #14
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Default My PFC Front End

I have noww figured out (with a little help from folks here) how to shrink the size of pic files to get under the 102kB size limit. Later today I will post pic(s) of my MC33262-based 180W PFC Front end. Note the series-connected output caps, as this provides a convenient midpoint for a half-bridge DC-DC converter to be connected to.

Steve
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Old 19th March 2005, 12:29 PM   #15
Alme is offline Alme  Ukraine
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Steve, I think the best way to have small size schematic pictures is to save them as GIFs (compresses very effectively if image has only a few colors). now , I'm waiting for your PFC ideas
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Old 19th March 2005, 08:55 PM   #16
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Default Picture (at last!) or PAL

Here it is. Resized to 94kB..............
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Old 19th March 2005, 08:58 PM   #17
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Default PFC Components

The rectifying diodes are MUR8100's, and the MOSFET is an MTW20N50E, 500V- 20A N-Channel. The control IC is a Motorola MC33262. The output caps are Panasomic 390uf 250V each.
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Old 24th March 2005, 01:47 PM   #18
Alme is offline Alme  Ukraine
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Steve, sorry for not answering till now, I've been busy with work.
So assuming that you use such high-voltage components, your PFC output voltage is about 400V, am I right? (390uF caps in series? )
can you post its schematic please?

By the way I begin to think that PFC issue is too far from audio guys focus since there's no others' contributions to the topic That's maybe true; I have interest in it because I've been both audio and power electronics engineer in my practice.
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Old 28th March 2005, 02:42 AM   #19
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Default PFC Output

Alme,

I set the output voltage for about +390V, and the two 390uF caps are each 250WVDC, and, yes, they are in series. The schematic I used was from the old Motorola data book for their discrete semiconductors. This was a 180W universal input PFC for the MC33262. Basically, this is the extended temperature range version of the MC34262. Here is the link:

http://www.onsemi.com/pub/Collateral/MC34262-D.PDF

Instead of the one 220uf Output cap, I substituted 2-390uF Caps for the half-bridge centertap, and their almost double value over the original 220uF is because since they are in series, their effective value is halved. And for the MTP8N50E. I substituted the now-discontinued MTW20N50E N-Channel MOSFET. The input rectifiers are MUR 8100's. The input rectifiers need to be ultra-fast types because now, high-frequency pulses are being drawn off the AC line.

Steve
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Old 28th March 2005, 02:41 PM   #20
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Steve, in your pointed pdf they say that it's one of advantages of critical-conduction mode - flyback diode actually shouldn't be ultrafast type there (rather cheap 250ns standard recovery type will fit). On the contrary, fixed-frequency PFC needs diode as fast as possible (25-35-50ns type) because it switches full current at the moment of going into reverse bias.
So what is the intention of your PFC? What you supply thru it?
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