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Power Tip 26: Current distribution in high-frequency conductors

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bikeron
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re: Power Tip 26: Current distribution in high-frequency conductors
bikeron   4/5/2013 4:56:38 PM
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Overall a nice article.. Proximity effects can be killer in transformer designs in that more heat is generated than simple calculations would indicate. Figure 4 shows this very well.

Doug.Leeper
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re: Power Tip 26: Current distribution in high-frequency conductors
Doug.Leeper   7/15/2011 3:52:50 PM
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Another point to consider is eddy current losses, where Litz wire can be a heavy hitter reducing losses.

docdivakar
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re: Power Tip 26: Current distribution in high-frequency conductors
docdivakar   6/23/2011 10:50:14 PM
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@David Ashton: it is a simple setup to generate these plots in a 2D Emag Field Solver. You can download the Student Version of Sonnet (Lite, Version 13) and generate the current distribution plots. Note that many of these solvers require you to manually mesh the (free) space around the conductors with elements and some may need infinite boundary definitions (depending on the solution technique used: finite elements, boundary integrals, etc.) Dr. MP Divakar

docdivakar
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re: Power Tip 26: Current distribution in high-frequency conductors
docdivakar   6/23/2011 10:43:24 PM
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There is an error in the units next to the formula, the depth unit should be "um" (micron). So for, 1 MHz, we should have a skin depth of 0.076mm or 76um... so for example, a 2-mil wide & deep trace conducting at 1-MHz, it will be all of the cross section conducting current. Good article none-the-less. Dr. MP Divakar

BicycleBill
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re: Power Tip 26: Current distribution in high-frequency conductors
BicycleBill   11/2/2010 2:40:32 PM
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Thanks, I believe you are correct, but I will check with the author

JanneG
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re: Power Tip 26: Current distribution in high-frequency conductors
JanneG   11/2/2010 1:02:21 PM
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The formula for skin depth at the top of the document seems to be wrong; the skin depth at 1 MHz for copper would be 7.6 centimeters, which clearly is erroneus. Kind regards //JanneG

David Ashton
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re: Power Tip 26: Current distribution in high-frequency conductors
David Ashton   9/4/2010 9:30:15 AM
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Can the author or someone else tell me how the diagrams above were arrived at? I don't doubt their accuracy - "Skin Effect" is a very well known phenomenon - but how do you measure the current INSIDE a wire?

Jimmy7410
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re: Power Tip 26: Current distribution in high-frequency conductors
Jimmy7410   8/20/2010 12:48:52 AM
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It is nice to see examples of how the fundamental laws affect circuit performance and this is certainly an effect that is measurable. Mr. Stearn's question about Litz wire is correctly directed to the effect in this Tip. Litz wire has improved the unloaded Q of inductors for me in filters in the VHF band. I believe there is an error in the coefficient in this Tip's first equation, it should be 1000 times smaller, and a more exact coefficient is 6.6e-3 for copper. Respectfully, Jimmy Takeuchi Seattle

Hoyt_Stearns
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re: Power Tip 26: Current distribution in high-frequency conductors
Hoyt_Stearns   8/11/2010 12:06:33 PM
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Thank you for your paper. I've never been able to find any information on using the skin effect to create non-linear filters, yet clearly if the resistance of an inductor changes with frequency, the filter characteristics will change. Also, what's your opinion on Litz wire? Thanks Hoyt Stearns Scottsdale Arizona US http://HoytStearns.com

DrFPGA
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re: Power Tip 26: Current distribution in high-frequency conductors
DrFPGA   8/7/2010 3:39:59 AM
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If you have not been following these tips you should start. Every one of these is well worth the read. Check any of them out and you will see what I mean...

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