EEVblog 1486 – What you DIDN’T KNOW About Film Capacitor FAILURES!

You might believe you understand exactly how movie capacitors deteriorate and also fall short in capacitance over time – self-healing due to rises? INCORRECT!
Capacitor specialist and also AVX Fellow Ron Demcko verifies what’s truly taking place after a teardown of some fallen short as well as one great polypropylene X course capacitor.

00:00 – Teardown of a some stopped working movie capacitors
00:52 – Self Healing as well as decrease in capacitance
01:44 – Capacitance Measurements
02:15 – Teardown of a brand-new Suntan brand name polypropylene X2 movie capacitor
03:03 – Different failing settings based upon dimension as well as winding stress
05:52 – Unwrapping the movie
07:51 – The movie inside a NEW movie capacitor
09:19 – Teardown of the FAILED uTx brand name heating system capacitor with fifty percent capacitance
10:06 – How Schoopage as well as completion pin discontinuations function
12:23 – Teardown proceeds …
12:45 – WOW! What in the world is this?
14:54 – Elecami Wolf additionally did a teardown
16:05 – Teardown proceeds …
17:01 – Separating the movie revealing both slef-healing and also comprehensive steel movie deterioration
18:29 – Another uTx brand name fell short movie capacitor from a Corsair PSU, with 90% loss in capacitance!
Elecami Wolf Youtube Channel: https://www.youtube.com/c/ElecamiWolf
19:55 – Let’s call a specialist! Ron Demcko from AVX informs us the REAL REASON for the failing!
It’s moisture access as well as corona demetallization!

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Discussion forum: https://www.eevblog.com/forum/blog/eevblog-1486-the-real-truth-why-film-capacitors-fail!

Metallized Film Capacitor Lifetime Evaluation and also Failure Mode Analysis record:
https://cds.cern.ch/record/2038610/files/45-56-Gallay.pdf

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Complete conversation with Ron Demcko: