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| Calculation of working life of aluminum electrolytic capacitor |
| Date of issue：2015-01-05 16:12:04 see： |
| Calculation of working life of aluminum electrolytic capacitor based on Ita Ploss = power loss of capacitor th = hot spot temperature IRMS = effective current TA = ambient temperature ESR = equivalent series resistance rth = thermal resistance Lop = expected working life= Calculation example (peh200oo427amb2) Input: ambient temperature = 70 ℃, ripple current = 30A (10 kHz) Working voltage = 350V ESR (85 ℃, 10 kHz) = 4.6m Ω Thermal resistance rth = 4.3 ℃ / W Calculation: power loss = IRMS? X ESR = 30? X 4.6 x 10 ֿ 3 = 4.1 W Hot spot temperature The assumed hot spot temperature of 85 ℃ is acceptable. (there is no significant difference in ESR between 88 ℃ and 85 ℃) Output: expected working life |
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