EEVblog 1486 - What you DIDN'T KNOW About Film Capacitor FAILURES!

You might think you know how film capacitors fail and degrade in capacitance over time - self-healing due to surges, right? WRONG!
Capacitor expert and AVX Fellow Ron Demcko confirms what's really going on after a teardown of some failed and one good polypropylene X class capacitor.

00:00 - Teardown of a some failed film capacitors
00:52 - Self Healing and drop in capacitance
01:44 - Capacitance Measurements
02:15 - Teardown of a new Suntan brand polypropylene X2 film capacitor
03:03 - Different failure modes based on size and winding pressure
05:52 - Unwrapping the film
07:51 - The film inside a NEW film capacitor
09:19 - Teardown of the FAILED uTx brand heater capacitor with half capacitance
10:06 - How Schoopage and the end pin terminations work
12:23 - Teardown continues...
12:45 - WOW! What on earth is this?
14:54 - Elecami Wolf also did a teardown
16:05 - Teardown continues...
17:01 - Separating the film showing both slef-healing and extensive metal film corrosion
18:29 - Another uTx brand failed film 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 an expert! Ron Demcko from AVX tells us the REAL REASON for the failure!
It's moisture ingress and corona demetallization!

Full discussion with Ron Demcko:
https://www.youtube.com/watch?v=9V99J22aiLE

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

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

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#ElectronicsCreators #Capacitors #Teardown