wiki:capacitor
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| - | ====== Capacitors ====== | ||
| - | ==== Aluminium Electrolytic Capacitors ==== | ||
| - | The life expectancy of of aluminium electrolytic capacitors is related to their operating conditions, mainly temperature and voltage. | ||
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| - | Usualy life expectancies ar 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%). | ||
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| - | 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). | ||
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| - | === Example Life Expectancy Calculation: === | ||
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| - | Assume the following aluminium electrolytic capacitor:\\ | ||
| - | Maximum operating temperature: 105°C\\ | ||
| - | Rated life expectancy: 10'000h (@105°C) | ||
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| - | 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: | ||
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| - | **Actual life expectancy = Rated life expectancy * 1.0717734^(Max. operating temperature - Actual operating temperature)** | ||
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| - | So we would get: __10'000h * 1.0717734^(105°C-85°C) = 56'569h__ | ||
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| - | (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) | ||
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wiki/capacitor.1549963338.txt.gz · Last modified: 2019/02/12 10:22 by roly128
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