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Type 947C Polypropylene, DC Link Capacitors
High Current, High Capacitance for Inverter Applications
Expected Lifetime Predictions
To use the Expected Lifetime curves calculate Va ?Vr and core
temperature T. Start by estimating:
Applied dc voltage Va
Ripple Current I
Ripple Frequency f
Ambient Temperature Ta
Airflow speed v
Units:
A=m2 T, Ta & Tc=°C
C=μF θ, θca & θcc =°C/W
ESR=m W v=m/s
f=kHz Va &Vr=Vdc
I=A
NOTE: The temperature rise in the 947C is I2(ESR) times the
thermal resistance θ. The ESR is mainly the metal resistance;
the metal resistance is the 10 kHz ESR. For operation below 10
kHz add the dielectric resistance. It is the dielectric dissipation
factor—no more than 0.0002—times the capacitive reactance,
i.e., 0.0002 ?(2πfC). That’s equal to 31.83 ?(fC).
1. Start with the 10 kHz ESR from the Ratings table. If frequency is
less than 10 kHz, add 31.83 ?(fC).
2. Compute total thermal resistance θ as the sum of core-to-case
thermal resistance θcc and case-to-ambient thermal resistance
θca. Both are in the Ratings table but θca is for still air and
θcc is for 10 kHz or less. For frequency > 10 kHz multiply θcc
by [1+(f –10)/100], e.g., for 75 kHz multiply θcc by 1.65.
For moving air use the capacitor surface area A and airflow speed
v to calculate θca = 1 ?[A(5+17(v+0.1) 0.66 )].
3. Compute Va ?Vr and the core temperature T.
T = Ta + I2(ESR)θ
4. Look up estimated lifetime from the Expected Lifetime curves.
5. If you want a longer expected lifetime, choose a capacitor with
higher voltage rating or consider using multiple capacitors in
parallel to share the ripple current.
The expected lifetime predictions assume no exposure to overvoltage transients.
Expected lifetime can be calculated for varying exposure to overvoltage transients.?
As an illustration at 50 °C the expected lifetime is 100,000 h with the 24-hour Va ∕ Vr
profile below:
Va / Vr
?1.67????
?1.50????
?1.30????
?1.10????
?1.00
Duration
100 ms
5 minutes
2.5 hours
9.6 hours
11.9 hours
For applications with more severe 24-hour profiles, contact us.
CDE Cornell Dubilier ? 1605 E. Rodney French Blvd. ? New Bedford, MA 02744 ? Phone: (508)996-8561 ? Fax: (508)996-3830
6
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