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Life Time Estimation

3. K

some bigger capacitors like Snap-In and Screw-Terminal types with rated voltages above 350V, the operating

voltage will affect their Lifetime. It is expressed as follows:

( )

K

U

A

U

R

-n

Where:

U

R

Rated Voltage

U

A

Actual Operating Voltage

n

Exponent, defined as:

0,5 ≤

U

A

≤ 1

→

n = 2,5

U

R

0 <

U

A

< 0,5 → n = 0

U

R

4.

Frequency Correction Factors: If the actual Ripple Currents are not given at the same frequency like I

weighing factors need to be applied.

I

A

Actual Rated Ripple Current (normalized)

I

Ripple Currents at different frequencies

F

Frequency Correction Factors for different frequencies

I

(

I

f 1

)

2

+

F

f 1

(

I

f 2

)

2

+

F

f 2

...

(

I

f n

)

2

F

f n

L = L

5.

JiAnGHAi Electrolytic Capacitor Lifetime Estimation Formula

T

I

A

∆ T

0

U

A

=

L

i

I

R

-n

U

R

T

I

4

I

2

T

85°C

→

K

2

0,5 ≤

U

A

≤ 1

→

n = 2,5

U

R

0 <

U

A

< 0,5 → n = 0

U

R