Specifications

12
Dec. 20
Mitsubishi IPM-series Application Note
7-2-3. Thermal Fatigue of Power Module
7-2-3-1 Operating Temperature Pattern
The operating temperature pattern of power module is displayed in Fig.7.3. It is important to consider two patterns that are
independent each other in thermal fatigue life of power module.
عOperation Mode 1
Power cycle life is called when change of case temperature is small, but frequent change of junction temperature occurs.
عOperation Mode 2
The other one is thermal cycle life when comparatively slow change of temperature occurs by start and stop of the system.
Fig.7.3 Operating Temperature Pattern
Re
p
eat in Short Time
Long Time of System On
Time
Tem
p
erature
Reliability