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Considering a series resistance (sum of the capacitor parasite drag and of the connection
contact resistances) equal to 100mOHM (0.1 OHM), act as following:
DATA:
1)
Having as a unit of measure the "L" inductance in Henry, the "C" capacitor in Farad and
the "R" resistance in Ohm, according to the above mentioned data:
2)
3)
( t
states the time needed by the current to reach its maximum value )
M
4)
the peak current can be calculated with the following formula:
=
I
P
It is obvious that considering a 70V discharge of the DC-LINK (3-mS mains dip) the
current is too high for the converter. As a consequence, it is necessary to consider a
lower voltage reduction (corresponding to a shorter mains dip). Therefore, with a voltage
reduction of 35V (1.5-mS mains dip), the new value will be:
—————— INSTRUCTION MANUAL——————
R = 0.1 Ω
L = 0.14 mH
V = 70V
1
ω
=
( -
L
*
C
ω = 1331.21 rad/S
R
α
=
2
*
L
π
=
t
M
2
*
ω
V
(
* )
α
t *
e
M
ω
*
L
I
= 286.1 A
P
C = 3760 mF
e = 2.718
2
R
)
2
*
L
from which:
from which:
from which :
a = 357.14
t
= 0.00117 s
M
I
= 572.3A
P
39-GB
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