STT181
Thyristor-Thyristor Modules
Fig. 7 Three phase AC-controller:
Power dissipation versus RMS
output current and ambient
temperature
3 x STT181
Fig. 8 Transient thermal impedance
junction to case (per thyristor or
diode)
RthJC for various conduction angles d:
d
RthJC (K/W)
DC
0.155
0.167
0.176
0.197
0.227
180oC
120oC
60oC
30oC
Constants for ZthJC calculation:
i
Rthi (K/W)
ti (s)
1
2
3
0.0072
0.0188
0.129
0.001
0.08
0.2
Fig. 9 Transient thermal impedance
junction toheatsink(perthyristor
or diode)
RthJK for various conduction angles d:
d
RthJK (K/W)
DC
0.225
0.237
0.246
0.267
0.297
180oC
120oC
60oC
30oC
Constants for ZthJK calculation:
i
Rthi (K/W)
ti (s)
1
2
3
4
0.0072
0.0188
0.129
0.07
0.001
0.08
0.2
1.0
SIRECTIFIER [ SIRECTIFIER SEMICONDUCTORS ]
