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    Benefits of Tantalum Powder Stress–Strain Curve Evaluation vs Conventional Wet Test

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    Researchers Demonstrated High Energy Ceramic Capacitors Stable in Wide Temperature Range

    Stackpole Offers High Voltage Plate Resistors up to 40KV

    How to Manage Supercapacitors Leakage Current and Self Discharge 

    Qualification of Commercial Supercapacitors for Space Applications

    Experimental Evaluation of Wear Failures in SMD Inductors

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Film Capacitor Failures Deep Dive Case Study

18.7.2022
Reading Time: 3 mins read
A A

Dave Jones from EEVblog released a video of his investigation into x class safety film capacitor failures.

In this practical case he managed home-made teardown and invite Ron Demcko, KYOCERA-AVX capacitor expert for explanation of the failure type observed.

RelatedPosts

Wk 40 Electronics Supply Chain Digest

Benefits of Tantalum Powder Stress–Strain Curve Evaluation vs Conventional Wet Test

Electrolyte Selection and Performance in Supercapacitors

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 KYOCERA-AVX Fellow Ron Demcko confirms what’s really going on after a teardown of some failed and one good polypropylene X class safety 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 KYOCERA-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=9V99J…

Film Capacitors Passive Components Knowledge Blog Links:

  • Film Capacitors construction: https://passive-components.eu/capacitors-electrostatic-constructional-solutions/
  • Film Capacitors self-healing explanation: https://passive-components.eu/capacitors-electrostatic-constructional-solutions/3/#split_content
  • Film Capacitor types: https://passive-components.eu/film-and-foil-organic-dielectric-capacitors/

Metallized Film Capacitor Lifetime Evaluation and Failure Mode Analysis report: https://cds.cern.ch/record/2038610/fi…

Forum: https://www.eevblog.com/forum/blog/ee…!

Related

Source: EEVblog

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