pm75cs1d120 Mitsumi Electronics, Corp., pm75cs1d120 Datasheet - Page 42

• Manufacturer Part Number: pm75cs1d120
• Description: Mitsubishi Ipm L1/s1-series Application Note Igbt Modules
• Manufacturer: Mitsumi Electronics, Corp.

(3) Average Power Loss
b. Junction Temperature Calculation
(1) tw1 is short (tw1<<1ms)
(2) Both of tw1 and tw2 are long(1ms<tw1<tw2<1s)
(3) tw2 is longer than 1s.(tw2>1s)
should be considered according to pulse width.
Junction temperature can be calculated by using P1, Pav, and PAV that has been obtained so far. Three cases
The average power loss per pulse is
Average power loss during period of tw2 is (See Fig.12.5)
N pulse numbers in tw2 period
Total average power loss is (See Fig.12.6)
P
P
P
Fig.12.4 is approximation of Fig.12.1 by using rectangle wave.
1
av
AV
t
E
w
t
P
E
1
1
w
av
1
2
(W)
N
t
T
w
2
2
(W)
(W)
Power Loss and Junction Temperature
Fig.12.4
Fig.12.5
Fig.12.6
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Sep. 2008