Timeline for Calculating the parasitic inductance of a capacitor
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Aug 24, 2021 at 12:03 | vote | accept | Shocked | ||
| Aug 24, 2021 at 11:23 | comment | added | Shocked | Ah ok, I see what you meant. Yes, that is correct. I misunderstood your answer and comment. Thank you for adding the diagram. | |
| Aug 24, 2021 at 11:21 | history | edited | tobalt | CC BY-SA 4.0 |
added 270 characters in body
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| Aug 24, 2021 at 11:18 | comment | added | tobalt | @Shocked we are talking ESL so this is obviously about AC current, which for all intents here does go through the cap, although - of course - no single charge carrier travels across any dielectric. I'll update my answer about the loop areas. | |
| Aug 24, 2021 at 11:12 | comment | added | Shocked | I also have to say that current does not go through the cap, and if it does, then you do not have a good cap (it is broken). The whole idea is that current does not pass via the cap in the way you expect. The charges stay on either side of the cap (on the electrodes) but do not pass through the dielectric. | |
| Aug 24, 2021 at 11:08 | comment | added | Shocked | Could you find (if possible) a diagram of this happening, loop area, and its relationship with the area of the electrodes? I find it difficult to see what is going on here, especially the loop area for a cap because I see no loop in my mind. | |
| Aug 24, 2021 at 11:02 | comment | added | tobalt | @Shocked The loop is a real thing: Current enters your cap through one lead, then goes through it along its internal electrodes and through the dielectric, and finally out the other lead (usually close by the first lead). So there is a loop area spanned by these "waypoints". The smaller this loop (the smaller the capacitor typically), the smaller the ESL. Even for the same loop area, one can bring down ESL however by using a wider electrode that leads around the loop. Large electrodes and small loop -> low ESL. | |
| Aug 24, 2021 at 10:58 | comment | added | Shocked | What do you mean if the electrode is wider around the loop, then the inductance will be smaller? Is the loop a real physical thing in this case or something imaginary to help us with analysis? So the area of the electrode plate matters, the smaller, the smaller the inductance? | |
| Aug 24, 2021 at 6:23 | history | answered | tobalt | CC BY-SA 4.0 |