wiki:capacitor
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
wiki:capacitor [2019/02/12 10:38] roly128 |
— (current) | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | ====== Capacitors ====== | ||
| - | {{ :wiki:aluminium_electrolytic_capacitor.jpg?nolink&200|}}===== Aluminium Electrolytic Capacitors ===== | ||
| - | |||
| - | === Life Expectancy === | ||
| - | {{ :wiki:elnareliabilityalumeleccaps.pdf |Illinois Capacitor - Reliability}}\\ | ||
| - | {{ :wiki:reliability_of_capacitors_general.pdf |Reliability of CDE Aluminum Electrolytic Capacitors}}\\ | ||
| - | {{ :wiki:reliability_of_cde_aluminum_electrolytic_capacitors.pdf |ELNA - Reliability of Aluminum Electrolytic Capacitors}} | ||
| - | |||
| - | The life expectancy of aluminium electrolytic capacitors is related to their operating conditions, mainly temperature and voltage. | ||
| - | |||
| - | Usualy life expectancies are rated at maximum operating temperatures, i.e. the operation time by which the capacity has changed by 20-25% or the ESR (equivalent series resistance) has risen to twice the initial limit (200%). | ||
| - | |||
| - | As a rule of thumb, for every 10°C below the maximum rated temperature, the life expectancy can be doubled. However, due to less than perfect sealing materials, a maximum life expectency of 15 years is usualy the limit (about 130'000 hours). | ||
| - | |||
| - | === Example Life Expectancy Calculation: === | ||
| - | |||
| - | Assume the following aluminium electrolytic capacitor:\\ | ||
| - | Maximum operating temperature: 105°C\\ | ||
| - | Rated life expectancy: 10'000h (@105°C) | ||
| - | |||
| - | At an actual operating temperature of 80°C we would operate 25°C below the maximum rated temperature and therefore more than quadruple its life expectancy. When expressing the rule of thumb as a formula we would get: | ||
| - | |||
| - | **Actual life expectancy = Rated life expectancy * 1.0717734^(Max. operating temperature - Actual operating temperature)** | ||
| - | |||
| - | So we would get: 10'000h * 1.0717734^(105°C-85°C) = __56'569h__ | ||
| - | |||
| - | (The constant 1.0717734.. comes from the relation of doubling the life expectancy for every 10°C below max. operating temperature:\\ | ||
| - | 1.0717734 = root base 10 of 2) | ||
| - | |||
wiki/capacitor.1549964297.txt.gz · Last modified: 2019/02/12 10:38 by roly128
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
