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Old 4th February 2013, 01:50 PM   #41
gootee is offline gootee  United States
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The example that was discussed in another thread used one hole per capacitor, with the copper removed from a small ring around each hole edge, for one lead to go to the bottom of the board. The other lead was bent to lay flat against the top copper, trimmed so that about a centimeter protruded out from under the cap, and soldered to the top copper.

The set of links to all of the posts about that example capacitor array are at the bottom of the post at LM3886 component selection .
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Old 4th February 2013, 01:57 PM   #42
gootee is offline gootee  United States
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Klaus, have you been busy developing and tweaking inductance-cancellation circuits?

I noticed that you hadn't posted for over a week and was imagining that you were spending a lot of time trying to develop a practical inductance-cancellation configuration, maybe with a PCB with etched spiral inductors. That would actually be very nice, because then maybe we could use just a few large capacitors and not worry so much about a having large array board.

Cheers,

Tom
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Old 4th February 2013, 10:02 PM   #43
KSTR is offline KSTR  Germany
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Tom,

No, I've just been too busy at work and that will continue until end of February, I fear.
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Old 5th February 2013, 04:36 AM   #44
gootee is offline gootee  United States
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That's why they pay you the big bucks.

I just got plugged into a new project, at work. So I might end up disappearing now and then, too.
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Old 15th August 2014, 11:30 PM   #45
gpapag is offline gpapag  Greece
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Quote:
Originally Posted by KSTR View Post
Today for something different and quite exiting : Inductance Cancellation of Filter Capacitors.

In an IEEE paper from 2004 [1] a technique is described how to lower the apparent ESL of a filter capacitor (three terminals; in, ground, out) by means of coupled inductances. This creates a negative inductance counteracting the capacitor intrinsic and wiring inductance, alongside with producing higher input/output inductance (not a bat thing) and more radiated magnetic and electric field energy at RF frequencies (less so).

[1] Filters and Components With Inductance Cancellation,
Timothy C. Neugebauer, Student Member, IEEE, Joshua W. Phinney, Student Member, IEEE, and
David J. Perreault, Member, IEEE,
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 40, NO. 2, MARCH/APRIL 2004, Pg. 483ff.
Thanks!

file:///C:/Documents%20and%20Setting...oads/86933.pdf

George
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Old 16th August 2014, 06:11 AM   #46
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That link will only work for you, since it is a browser link directly to your own hard drive. When I click on it my computer will look in my own hard drive to find the file and it won't be there. Wrong link?
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Old 16th August 2014, 08:03 AM   #47
gpapag is offline gpapag  Greece
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Ooups!! I am sorry gentlemen. It’s just me (1st attachment)



The link should be this:
https://www.google.gr/url?sa=t&rct=j...73231344,d.d2k

In case the link won't work again, read 2nd attachment

George
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File Type: jpg monkey_660.jpg (13.5 KB, 36 views)
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File Type: pdf MIT.pdf (435.5 KB, 11 views)
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Last edited by gpapag; 16th August 2014 at 08:21 AM.
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Old 16th August 2014, 08:20 AM   #48
gpapag is offline gpapag  Greece
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Yes, it is patented. Very informative patent, congratulations to the authors!
Filter having parasitic inductance cancellation

One more paper from them:
http://www.rle.mit.edu/per/Conferenc...APEC07p512.pdf

George
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Last edited by gpapag; 16th August 2014 at 08:23 AM.
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Old 16th August 2014, 09:12 AM   #49
KSTR is offline KSTR  Germany
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While we're at it, they also have a paper on capacitance cancellation for inductors, again using a clever transformer scheme.

-------:--------

Now this stuff is 10 years old but I haven't seen any commercial components/filters that explicitly use these cancellation schemes for standard applications like mains filtering, in consumer/audio devices????
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