Hello,

Take a look at this page about "Understanding the Parasitic Effects In Capacitors"
http://www.analog.com/library/analogDialogue/Anniversary/21.html

The page comes from the EDUCYPEDIA page on capacitors.
http://www.educypedia.be/electronics/capacitors.htm

Greetings,
Bertus

Hallo, heer Bertus,
Na een flink aantal experimenten met elco's zijn er een paar verrassende topologiën naar boven gekomen. Maar u kent dat: iedere ontdekking/antwoord
roept altijd weer nieuwe vragen op. Aangezien die in deze thread beetje off-topic
zouden worden, wil ik u verzoeken, of ik 1 korte mail als PM mag sturen, zodat u
kunt beoordelen, wie mij daarbij het beste zou kunnen helpen, zonder de rest van
de community te storen.
Hoor graag van u, met vriendelijke groet, Raymond Bakker

Mod:Translation. Please use English text, @bertus

Mod: link to old thread.
https://forum.allaboutcircuits.com/threads/why-do-caps-have-leakage-and-esr.17967/post-112254

Hello Mr Bertus,
After quite a few experiments with electrolytic capacitors, a few surprising topologies have emerged. But you know that: every discovery/answer
always raises new questions. Since it's a bit off topic in this thread
would be, I would like to ask you if I can send 1 short mail as a PM, so that you
can judge who could best help me with that, without the rest of
disturb the community.
Looking forward to hearing from you, Sincerely, Raymond Bakker

 

Hello,

I have corrected the EDUCYPEDIA link in my previous post to : http://educypedia.karadimov.info/electronics/capacitors.htm
Keep in mind that the site might contain old links.
The internet archive might have stored copies in the wayback machine of the not working link.
https://archive.org/web/

Bertus

 

Leekage:
A perfect capacitor has two perfect charge holding conducting surfaces separated by a perfect insulator.

Unfortunately, we know of no perfect insulator, nor conductors,
so the charge dissipates through the resistance of the insulator.


ESR: Effective serial resistance
when you charge / discharge the perfect capacitor,
your instantly trying to move a charge ( current ) through the conductors of the capacitor
unfortunately, the perfect conductors are not, due to material they have resistance,
due to shape they have inductance, due to the surrounding insulator, they have capacitance.
QED, it forms a RLC filter,
thats why ESR is quoted at a measurement frequency

 

Hello,

@SYNFONIQUE , If you want to know more about capacitors, have a look at the capsite:
http://www.iequalscdvdt.com/

Bertus

 

Imperfect components must be fabricated from less than perfect materials. That's it in a nutshell.

 

Hello,

@SYNFONIQUE , If you want to know more about capacitors, have a look at the capsite:
http://www.iequalscdvdt.com/

Bertus

Thanks very much, Bertus. A pleasure indeed to browse this capsite. But - like most
textbooks, tutorials, etc. - it does not tell exactly what is going on during charging
of an electrolytic cap in an AC>DC PSU. E.g. that ESR determines inrush current peak
value, not capacitance. And for series-connected e-caps: Rleak-ratio determines the
voltage division, not capacitances; moreover, the equal-charge rule from the theory
does not hold in practice. I've been experimenting for some time with e-caps in un-
conventional topologies and devised several interesting circuits along the way.
As a fellow Dutchman, I would ask you to refer me to experts in order to evaluate
these further. May I send you a PM to that effect ? Thanks beforehand.

 

Thanks very much, Bertus. A pleasure indeed to browse this capsite. But - like most
textbooks, tutorials, etc. - it does not tell exactly what is going on during charging
of an electrolytic cap in an AC>DC PSU. E.g. that ESR determines inrush current peak
value, not capacitance. And for series-connected e-caps: Rleak-ratio determines the
voltage division, not capacitances; moreover, the equal-charge rule from the theory
does not hold in practice. I've been experimenting for some time with e-caps in un-
conventional topologies and devised several interesting circuits along the way.
As a fellow Dutchman, I would ask you to refer me to experts in order to evaluate
these further. May I send you a PM to that effect ? Thanks beforehand.

Bertus, have I done something wrong - protocol- or other-wise ?

 

Hello,

I have found this reference sheet at the internet archive:
https://archive.org/details/altronics-electronics-reference-sheet/mode/2up

Bertus

Hello, Bertus, sorry for replying off-topic, but I don't seem to get the hang of this
forum ... I tried to reach you before with the following reply to an indeed old, but
on-topic thread. (here it comes)

Hello,

@SYNFONIQUE , If you want to know more about capacitors, have a look at the capsite:
http://www.iequalscdvdt.com/

Bertus

Thanks very much, Bertus. A pleasure indeed to browse this capsite. But - like most
textbooks, tutorials, etc. - it does not tell exactly what is going on during charging
of an electrolytic cap in an AC>DC PSU. E.g. that ESR determines inrush current peak
value, not capacitance. And for series-connected e-caps: Rleak-ratio determines the
voltage division, not capacitances; moreover, the equal-charge rule from the theory
does not hold in practice. I've been experimenting for some time with e-caps in un-
conventional topologies and devised several interesting circuits along the way.
As a fellow Dutchman, I would ask you to refer me to experts in order to evaluate
these further. May I send you a PM to that effect ? Thanks beforehand.

 

Hello,

You can not start PM's now.
You must have 10 posts to be able to start a PM.
I more like to discuss things in the forum itself, as others might also have some insights.
Here is a PDF on how the ESR is build-up in a capacitor.

Also these pages might interest you:
https://recom-power.com/en/rec-n-inrush-current--a-guide-to-the-essentials-119.html?0
https://www.avnet.com/wps/portal/ab...understanding-esr-in-electrolytic-capacitors/

Bertus