STD/SDT18
Thyristor-Diode Modules, Diode-Thyristor Modules
Fig. 7 Three phase AC-controller:
Power dissipation versus RMS
output current and ambient
temperature
3 x STD/SDT18
STD/SDT18
Fig. 8 Transient thermal impedance
junction to case (per thyristor)
R
thJC
for various conduction angles d:
d
DC
o
180 C
o
120 C
o
60 C
o
30 C
R
thJC
(K/W)
1.3
1.35
1.39
1.42
1.45
Constants for Z
thJC
calculation:
i
1
2
3
R
thi
(K/W)
0.018
0.041
1.241
t
i
(s)
0.0033
0.0216
0.191
STD/SDT18
Fig. 9 Transient thermal impedance
junction to heatsink (per thyristor)
R
thJK
for various conduction angles d:
d
DC
o
180 C
o
120 C
o
60 C
o
30 C
R
thJK
(K/W)
1.5
1.55
1.59
1.62
1.65
Constants for Z
thJK
calculation:
i
1
2
3
4
R
thi
(K/W)
0.018
0.041
1.241
0.2
t
i
(s)
0.0033
0.0216
0.191
0.46
SIRECT [ Sirectifier Global Corp. ]
