STT18 查看數據表（PDF） - Sirectifier Electronics
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STT18 Datasheet PDF : 4 Pages
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STT18
Thyristor-Thyristor Modules
Fig. 7 Three phase AC-controller:
Power dissipation versus RMS
output current and ambient
temperature
3 x STT18
STT18
STT18
Fig. 8 Transient thermal impedance
junction to case (per thyristor)
RthJC for various conduction angles d:
d
DC
180oC
120oC
60oC
30oC
RthJC (K/W)
1.3
1.35
1.39
1.42
1.45
Constants for ZthJC calculation:
i
Rthi (K/W)
ti (s)
1
0.018
0.0033
2
0.041
0.0216
3
1.241
0.191
Fig. 9 Transient thermal impedance
junction to heatsink (per thyristor)
RthJK for various conduction angles d:
d
DC
180oC
120oC
60oC
30oC
RthJK (K/W)
1.5
1.55
1.59
1.62
1.65
Constants for ZthJK calculation:
i
Rthi (K/W)
ti (s)
1
0.018
0.0033
2
0.041
0.0216
3
1.241
0.191
4
0.2
0.46
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