STD/SDT27
Thyristor-Diode Modules, Diode-Thyristor Modules
Fig. 7 Three phase AC-controller:
Power dissipation versus RMS
output current and ambient
temperature
3 x STD/SDT27
STD/SDT27
Fig. 8 Transient thermal impedance
junction to case (per thyristor or
diode)
R
thJC
for various conduction angles d:
d
DC
180
o
C
120
o
C
60
o
C
30
o
C
R
thJC
(K/W)
0.88
0.92
0.95
0.98
1.01
Constants for Z
thJC
calculation:
i
1
2
3
R
thi
(K/W)
0.019
0.029
0.832
t
i
(s)
0.0031
0.0216
0.191
Fig. 9 Transient thermal impedance
junction to heatsink (per thyristor
or diode)
STD/SDT27
R
thJK
for various conduction angles d:
d
DC
180
o
C
120
o
C
60
o
C
30
o
C
R
thJK
(K/W)
1.08
1.12
1.15
1.18
1.21
Constants for Z
thJK
calculation:
i
1
2
3
4
R
thi
(K/W)
0.019
0.029
0.832
0.2
t
i
(s)
0.0031
0.0216
0.191
0.45
SIRECT [ Sirectifier Global Corp. ]
