| 摘要 |
PROBLEM TO BE SOLVED: To improve cooling performance of a power controller while suppressing an increase in load on a supply source for a refrigerant. SOLUTION: The power controller 10 includes substrates 15a, 15b having mounting surfaces where a plurality of elements 21 are mounted, respectively, and disposed so that surfaces on the opposite sides from the mounting surfaces may face each other, a cooling flow passage 22 formed in a cooling tube 20 to which the substrates 15a, 15b are joined and connected to an unillustrated pump configured to supply the refrigerant for exchanging heat with the elements 21, and a thermal expansion material 23 disposed in the cooling flow passage 22, the thermal expansion material 23 thermally expanding as the temperature of the refrigerant rises to reduce the flow passage sectional area of the cooling flow passage 22 to increase the flow velocity of the refrigerant. COPYRIGHT: (C)2011,JPO&INPIT
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