Medium Power Film Capacitors
FFLI 1500V to 3000Vdc (RoHS Compliant)
The FFLI series is specifically designed for DC filtering
applications such as DC link.
This high voltage range offers solutions for voltage from 1500V
up to 3000V.
The
Controlled Self Healing Technology,
essential to ensure a
safe and reliable behaviour, is achieved using a wet solution with
both polypropylene metallized film and oil (without free oil).
Standard designs proposed in this catalogue are covering a wide
range of voltage and capacitance values.
In case of specific requirements about shape and performances,
please feel free to contact your local AVX representative.
PACKAGING MATERIAL
Aluminium cylindrical case filled polyurethane resin.
Self extinguishing polyurethane resin (V0 : in accordance with UL94 ; M2F1 : in accordance with NF F 16-101)
Self extinguishing plastic cover (V0 : in accordance with UL94)
RoHS components
M6/10 Female connections or M8/20 Male connections
STANDARDS
IEC 61071 : Power electronic capacitors
IEC 61881 : Railway applications, rolling stock equipment, capacitors for power electronics
IEC 60068-2 : Environmental testing
IEC 61373 : Shock and vibrations
UL 94 : Fire requirements
HOW TO ORDER
FFLI
Series
6
Dielectric
6 = polypropylene
R
Voltage
Code
R = 1500V
S = 1750V
N = 2000V
T = 2250V
P = 2500V
W = 2750V
X = 3000V
0257
Capacitance
EIA code
K
--
Capacitance
Terminal Code
Tolerance
-- = Male threaded
K = ± 10%
JE = Female threaded
Medium Power Film Capacitors
FFLI 1500V to 3000Vdc (RoHS Compliant)
DEFINITIONS
C
n
(µF)
U
n
(V)
U
w
(V)
U
r
(V)
L
s
(nH)
R
s
(mΩ)
I
rms
(A)
amb
(°C)
capacitance
rated DC voltage
working voltage
ripple voltage
parasitic inductance
series resistance
RMS current
cooling air temperature
hot spot temperature
integral of action
nominal value of the capacitance measured at
amb
= 25
10°C
maximum operating peak voltage of either polarity (non-reversing type
waveform), for which the capacitor has been designed for continuous
operation
value of the maximum operating recurrent voltage for a given hot spot
temperature and an expected lifetime
peak-to-peak alternating component of the unidirectional voltage
capacitor series self-inductance
capacitor series resistance due to galvanic circuit
RMS current value for continuous operation under natural convection
generating 30°C overheating
temperature of the cooling air measured at the hottest position of the
capacitor, under steady-state conditions, midway between two units
NOTE If only one unit is involved, it is the temperature measured at a point approximately
0,1 m away from the capacitor container and at two-thirds of the height from its base
HS
(°C)
I²t
(A²s)
highest temperature obtained inside the case of the capacitor in thermal
equilibrium
maximum repetitive integral of action that galvanic circuit is able to
withstand
CHARACTERISTICS
Capacitance range C
n
Tolerance on C
n
Rated DC voltage U
n
Lifetime at U
n
and 70°C hot-spot temperature
and
C
/ C < 2%
Parasitic inductance L
s
Maximum RMS current I
rms
Test voltage between terminals @ 25°C
Test voltage between terminals and Case @ 25°C
Dielectric
Climatic Category
Working temperature
Storage temperature
Calorific value
58µF to 1100µF
±10%
1500 to 3000V
100,000h
40 to 60nH
up to 92A
rms
1.5 x U
n
for 10s
7kV
rms
@ 50Hz for 10s
polypropylene
40 / 85 / 56 (IEC 60068)
-40°C / +85°C
(according to the power dissipated)
-40°C / +85°C
40MJ / kg
Medium Power Film Capacitors
FFLI 1500V to 3000Vdc (RoHS Compliant)
LIFETIME EXPECTANCY VS HOT SPOT TEMPERATURE AND VOLTAGE
HOW TO CHOOSE THE RIGHT CAPACITOR
The capacitor lifetime depends on the working voltage and the hot spot temperature.
Our caps are designed to meet 100000 hours lifetime at rated voltage and 70°C hot spot temperature. In
accordance with operating conditions, please calculate the hot spot temperature and deduce from this calculation if
the obtained lifetime can suit the application.
1- From the tables, select a capacitor with
required capacitance C
n
and voltage U
n
.
Calculate the maximum ripple voltage allowed for
the selected cap : U
rmax
= 0,2U
n
If U
r
> U
rmax
, select a capacitor with higher rated
voltage
Make sure I
rms
application < I
rms
table
Copy out :
serial resistance (R
s
) : see table of values
thermal resistance R
th
Medium Power Film Capacitors
FFLI 1500V to 3000Vdc (RoHS Compliant)
2- Hot spot temperature calculation
Total losses are calculated as follow: P
t
= P
j
+ P
d
Joule losses : P
j
= R
s
x I
rms
²
Dielectric losses : P
d
= Q x tg
0
with
R
th
θ
HS
θ
AMB
R
th
: thermal resistance between hot spot and ambient air
I
- Q(reactive power) =
rms
for a sinusoidal waveform
C
- tg
0
= 2 x 10 (dielectric losses of polypropylene)
Hot spot temperature will be:
HS
=
amb
+ (P
j
+ P
d
) x R
th
-4
2
HS
absolute maximum is 85°C
If temperature is higher than 85°C, come back to #1 and
start again with another selection.
3- Refer to the curve and deduce the lifetime vs U
w
/ U
n
ratio
LIFETIME EXPECTANCY VS HOT SPOT TEMPERATURE AND VOLTAGE
eg:
rated voltage 2000V
working voltage 2200V
= 1,1
lifetime 80 000hours @ 60°C hot spot temperature
Please, find a calculation form at the end of the catalogue
Medium Power Film Capacitors
FFLI 1500V to 3000Vdc (RoHS Compliant)
MTBF CALCULATION
The failure rate
B
depends on hot spot temperature
HS
and charge ratio
.
= U
w
/ U
n
B
½
3
10
2,75
1
e
30
3, 2
HS
273
358
10
9
in failures/hour
GENERAL FAILURE RATE
=
B
x
Q
x
B
x
E
failures/hour
Qualification
Product qualified on IEC61071 and
internal qualification
Product qualified on IEC61071
Product answering on another norm
Product without qualification
Q
,
B
and
E
see following tables
Qualification
factor
Q
1
2
5
15
Environment
On ground (good conditions)
On ground (fixed materials)
On ground (on board)
On ship
On plane
Environment
factor
E
1
2
4
9
15
Environment
Favorable
Unfavourable
Environment
factor
B
1
5
MEAN TIME BETWEEN FAILURE (MTBF)
MTBF = 1 /
hours
SURVIVAL FUNCTION
N = N
0
x exp(-t)
N is the number of pieces still working after t hours.
N
0
is the number of pieces at the origin (t = 0)
FAILURE MODE
Main failure mode due to AVX’s
Controlled Self-Healing Technology
is only losses of capacitance.
Thanks to
Controlled Self-Healing
solution to interrupt self-healing process in order to prevent avalanche effect
due to polypropylene molecular cracking producing gas and potential explosion in confined box for none
Controlled Self-Healing capacitors.
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