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Old 20th November 2010, 05:54 AM   #11
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I found a good calculator here....TRANSFORMERS
Next question is: Since this is a common mode input choke do I use 50-60Hz for the freq or the 85KHz. Since it is before the bridge rectifier I would assume it uses the supply line freq.
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Old 23rd November 2010, 01:38 AM   #12
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After doing some searching I have found some online common mode choke calculators. They all seem to lean twards 12AWG wire for ~20A. I have no problem finding the wire....but I am having no luck finding a source for anything to wind it on. Anyone know any sources (prefered in the US) that I can check out for either torids or transformer style chokes?
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Old 23rd November 2010, 10:23 PM   #13
TechGuy is offline TechGuy  United States
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Quote:
Originally Posted by crazifunguy View Post
After doing some searching I have found some online common mode choke calculators. They all seem to lean twards 12AWG wire for ~20A. I have no problem finding the wire....but I am having no luck finding a source for anything to wind it on. Anyone know any sources (prefered in the US) that I can check out for either torids or transformer style chokes?
Why don't you just buy a 20A common mode choke:
Digi-Key - M8916-ND (Manufacturer - 8121-RC)
FYI: looks like the Bourns 20A 1mh Common Mode Choke is using 14 gauge wire.

Coil winding Specialists sells toroid cores you can use if you want to roll your own.
Products : CWS ByteMark, largest supplier of toroids, ferrite cores, iron powder cores, MPP cores and RF cores
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Old 23rd November 2010, 10:47 PM   #14
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What would the effect be from changing the inductances in these chokes?

From the sim design at 250KHz

The common mode choke in the EMI filter calls for 761uH
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Old 24th November 2010, 05:15 AM   #15
luka is offline luka  Slovenia
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what are you doing? why would you need 250kHz, if you can get away with 100k or so
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Old 24th November 2010, 06:16 PM   #16
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I was playing with the design software and higher switching frequency drasticly changed L4.

I was looking at the app notes for the Controller IC there is a sample circuit and schematic. The typical Frequency is 133Khz. So Luca you are correct with not needing to be up in the 200 range. The IC will support running at 250KHz but isnt necessary.

Here is the sample datasheet.
http://www.sacg.com.tw/sacweb/marcom...CE1PCS01-1.pdf
Can someone explain to me why the datasheets only use 1 inductor and the poweresim design software uses 2. I dont understand why the L4 section is present in the schematic that I posted.
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Old 24th November 2010, 07:59 PM   #17
luka is offline luka  Slovenia
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L4 is you main inductor, with secondary to supply IC, most have that in design, even I
L3 and one cap you don't need, but it is the to make ""pi" filter
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Old 24th November 2010, 08:28 PM   #18
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If the turns ratio of L4 is 53:2 I am guessing that I would have about 6-12V for power to an IC if I was to feed this into a regulator would I parallel off of c9? How reliable is this VS an external supply for the IC?
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Old 24th November 2010, 08:31 PM   #19
luka is offline luka  Slovenia
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in my case, from no load to more then 1kw, no problems... just make sure that there is say 8v at lowest input voltage... with my high voltage, I CAN'T get any low voltage there
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Old 25th November 2010, 02:42 AM   #20
Cristi is offline Cristi  Europe
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L1 - 1.76 mH (EE55 7 turns)
from the number of turns you make me believe that you gonna use an ungaped core ????? the switching transistor will blow-up instantly, due to the inductor saturation. however, 7 turns on ungaped EE55 cannot give you more than 300-400uH. Al=6-8uH/ts2.
consider using a kool-mu toroid, at least one 0077083A7 for this power level.
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