| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an on-vehicle power conversion apparatus which expands an area of a heat radiation surface capable of cooling a heat generation electronic component while reducing the manufacturing costs and avoiding the deterioration of the cooling performance and the mountability.SOLUTION: An on-vehicle power conversion apparatus 1 according to this invention includes: multiple through holes 8, 9 which are provided below a switching element 4 placed on a placement surface 7 while penetrating through the housing 2, opens on a side wall surface 11 of the housing 2, and are arranged in a direction that the placement surface 7 spreads; and a first water passage lid 10 which connects an opening of the through hole 8 and an opening of the through hole 9 which open on the same side wall surface 11. A refrigerant passage 15 is formed by the through holes 8, 9, the first water passage lid 10, and the side wall surface 11 covered by the first water passage lid 10. A refrigerant for cooling the switching element 4 flows through the refrigerant passage 15.</p> |
