Film capacitors – Power Electronic Capacitors
General purpose applications
B2536*
MKP AC HP
Terms and formulas
Maximum current Imax
The maximum RMS current for continuous operation
Maximum peak current î
The maximum current amplitude which occurs instantaneously during continuous operation.
The maximum peak current (Î) and the maximum rate of voltage rise (dV/dt) max on a capacitor are related as
follows:
Î = C · (dv/dt)max
Maximum surge current Is
The admissible peak current induced by a switching or any other disturbance of the system which is allowed for
a limited number of times.
Is = C · (dv/dt)s
Maximum duration:
50 ms/pulse
Maximum number of occurrences:
1000 (during load)
Series Resistance Rs
The series resistance of a capacitor is the result of the resistive losses that occur in the electrodes, in the
contacting and in the inner wiring.
The series resistance Rs generates the ohmic losses (I2.Rs) in a capacitor, and it is largely independent of
frequency.
Self-Inductance Lself
The self-inductance is produced by the inductance of the terminals and the windings.
With Self-Inductance, it is possible to determine the Resonance Frequency.
1
F =
2π Lself C
FILM P PM
May 2012
Please read Cautions and warnings and
Page 4 of 8
Important notes at the end of this document.
EPCOS [ EPCOS ]
