The temperature effect on thermal resistance of power modules is studied in this paper by a thermal model considering the effect. Simulation Results indicate that the temperature effect can't be neglected when the ambient temperature is above 90 oC. The thermal dissipation capacity of cooling system for power modules should be improved due to a increase of thermal resistance when ambient temperature and/or power loss increases, which is important for the stability and reliability of the power module within electric power propulsion system. The temperature effect is verified by experiment.
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