| Electronics > Projects, Designs, and Technical Stuff |
| Cheap electrolytic caps - reliability |
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| wraper:
--- Quote from: Miyuki on December 03, 2018, 06:21:47 pm ---And they are also cheapest low esr/high ripple at shop if I don't count Elite brand which have terrible reputation --- End quote --- Actually Elite are quite decent IME. You'll have a hard time finding of them mentioned going bad. FWIW Samxon and Samwha made their share of crap as well. Such as GF and WB series respectively. Edit, actually Elite is used by Dell quite a lot. |
| wraper:
Also I would consider using Lelon and Ltec. Quite old brands and IME repairing stuff they were reliable. |
| splin:
--- Quote from: EHT on December 02, 2018, 08:27:24 pm ---I wonder about how to translate the lifetime figures. Even the highest rated ones still do not represent a long life for equipment which may be operated 24/7 (i.e. 8760h / year), such as a UPS. The figures quoted are at the highest temp but they never say how long the caps are rated for at lower temps e.g. < 50C. I select those with the highest lifetime given the other constraints, but I'm not designing commercial products. --- End quote --- The manufacturer should publish this info in the datasheet or a technical bulletin/application note. Generally the lifetime doubles for every 10C reduction in temperature. The ripple current through the capacitor's ESR will dissipate power, heating the capacitor above ambient. There is a useful calculator here where you can estimate lifetime based on temperature, ripple current, case dimensions etc.: https://www.illinoiscapacitor.com/tech-center/life-calculators.aspx |
| Miyuki:
Have someone experience with Polymer caps ? For example that Elite one UPE Series will offer better ripple current than classic equivalent for same or lower price And expected lifetime is also higher for them |
| BravoV:
--- Quote from: splin on December 03, 2018, 10:39:20 pm ---The manufacturer should publish this info in the datasheet or a technical bulletin/application note. Generally the lifetime doubles for every 10C reduction in temperature. The ripple current through the capacitor's ESR will dissipate power, heating the capacitor above ambient. There is a useful calculator here where you can estimate lifetime based on temperature, ripple current, case dimensions etc.: https://www.illinoiscapacitor.com/tech-center/life-calculators.aspx --- End quote --- Thanks for the link. Intrigued, I did play abit for the polymer type, and set the ambient temp say like 60 or 70 C, surprisingly that thing will work for few generations. :o |
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