Capacitor Electrolytic
2008
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Capacitor Electrolytic
Does anyone have a chart that shows electrolytic capacitor degradation vs temperature?
I need to determine how an electrolytic capacitor degrades at different temperatures for an engineering project I am working on. A search on the internet yields nothing.
I don't have a chart, but I have a formula:
1/ESRt = 1 /ESR0(1-k * t ^ (-4700/(T+273))
Where
ESR = Electrical Series Equivalent resistance
T = the temperature in Centigrades
t = the number of hours
ESR0 = Start Electrical Series Equivalent resistance at t=0
k = the value of the capactor in Farads.
So... assuming ESR of 51 ohms, Capacitance at 50 uF, time of 100 hours, and temperature of 20 C, you get a degradation of .001% after 100 hours.
Same everything except changing the temperature to 100C and you get a .052% degradation after 100 hours
So basically a 50 uF capacitor degrades 52 times faster at 100C than it does at 20C.
