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Medium Power Film Capacitors
FSB (RoHS Compliant)
STANDARDS
IEC 61071-1, IEC 61071-2: Power electronic capacitors
TANGENT OF LOSS ANGLE (TAN δ 0 )
FOR POLYPROPYLENE DIELECTRIC
Polypropylene has a constant dielectric loss factor of 2x10 -4
irrespective of temperature and frequency (up to 1 MHz).
IGBT SNUBBER
I
HOT SPOT TEMPERATURE CALCULATION
See Hot Spot Temperature, page 3.
θ hot spot = θ ambient + (P d + P t ) x R th
with P d (Dielectric losses) = Q x tg δ 0
? [ 1 ? 2 x C n x (V ripple peak to peak ) 2 x f ] x (2 x 10 -4 )
P t (Thermal losses) = R s x (I rms ) 2
Rth : Rth ambient / hot spot in °C/W
where C n in Farad I rms in Ampere f in Hertz
V in Volt R s in Ohm θ in °C
Due to the design of the capacitor and its technology, the
thermal impedance between the terminations and the core
of the capacitor is low, it is necessary to take care that
the capacitor is never overheated by use of wrongly sized
connections.
Do not use the capacitor as a heat sink.
Due to the complexity of the IGBT / capacitor thermal
exchanges, we recommend that thermal measurements
shall be made on the different components. We would be
pleased to advise you on specific applications.
t
T = 1/fr
WORKING TEMPERATURE
With
U
U0
(according to the power to be dissipated) -40°C to +85°C
MARKING
TPC logo
Capacitance and tolerance in clear
t
L = stray inductance IGBT + capacitor
R = serial resistance IGBT + capacitor
Nominal DC voltage in clear
RMS current in clear
Date of manufacture (IEC coding)
b 2 j U
C
0
e –2
b + a b b
b
T ) ] + 1 e
a
b a a
–
+
Ieff =
2
b
0
2
1
T
T
2 2 [ sin(2
T ) –
a
cos(2
a
–2
T
+
2 2
1
a = 2 L ; b =
with
b
0=
1 ;
LC
R
b
2
0
–
a
2
30
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