Technical Explanation
SKiiP
®
3 Parallel Board
© by SEMIKRON
2017-08-30
– Rev02
12 / 20
9.1
Measurement of output current
The SKiiP
®
3 Parallel board sums all the output current values from the connected SKiiP
®
3 subsystems. The
value of sum current must be divided by the number of connected SKiiP
®
3 subsystems to get the current value
per SKiiP
®
3 (See Figure 8). Please see the data sheet SKiiP
®
3, page 2 for the I
TRIPSC
value for corresponding
SKiiP
®
3 subsystem.
Figure 8: Measurement of AC-output current by SKiiP
®
3 Parallel board
I ana out
[V]
10V
-10V
2*I
TRIPSC
Controller
SKiiP
®
3
‚A‘
SKiiP
®
3
‚C‘
I
out
I
out
[A]
I ana
out [V]
I ana out
[V]
2
S
K
ii
P
®
3
S
u
m
C
u
rr
e
n
t
3
SK
iiP
®
3
Su
m
C
ur
re
nt
4S
Ki
iP
®
3 S
um
C
ur
re
nt
±
Δ I
out SKiiP
®
3
Parallel board 4-
fold as example
3*I
TRIPSC
4*I
TRIPSC
- 2*I
TRIPSC
- 3*I
TRIPSC
- 4*I
TRIPSC
SKiiP
®
3
‚B‘
SKiiP
®
3
‚D‘
The measured current is normalized to a corresponding voltage at the DIN41651 connector of the parallel
board. (See Table 6). The values given in the Table 6 are related only to the SKiiP
®
3 Parallel board. For
SKiiP
®
3 current measurement parameters please refer to the SKiiP
®
3 Technical Explanation Rev.2 Chapter
“AC-Current sensor”.
Table 6:
Signal characteristics of current measurement
Signal Charakteristics
Value
Output signal
I_ANA / GND_ANA at connector X1
Max. output current I
I-out
5mA
Output voltage range V
I-Out
-10V to +10V
(normalized, independent from number of
SKiiP3 subsystems)
Amplification ratio
Type 1: 0,5
signal ratio connected SKiiP
®
3 (A/V) * 2
Type 2: 0,33
signal ratio connected SKiiP
®
3 (A/V) * 3
Type 3: 0,25
signal ratio connected SKiiP
®
3 (A/V) * 4
Accuracy of analogue signal
±1%
1)
Small signal bandwidth
50kHz
1)
Considering the aging drift of precision input resistors the accuracy can maximal increase to ± 1.8
% for “Sum
of current
” over full temperature range.
