Patent ID: 9673130
Date: 2017-06-06
CPC Classifications: H01L,H05K

Claim:
1. A semiconductor device comprising a first circuit substrate and a second circuit substrate, a first semiconductor element mounted on the first circuit substrate and a second semiconductor element mounted on the second circuit substrate, and a cooler on which the first circuit substrate and the second circuit substrate are mounted and which cools the first semiconductor element and the second semiconductor element, wherein the cooler comprises: a heat dissipation portion that includes a first surface and a second surface opposing the first surface and on which the first circuit substrate and the second circuit substrate are bonded to the first surface; fins disposed on the second surface; a case that includes a first sidewall and a second sidewall opposing the first sidewall, that houses the fins, and that is connected to the heat dissipation portion; an inlet portion for a cooling liquid disposed on the first sidewall and an outlet portion therefor disposed on the second sidewall; an inlet path connected to the inlet portion and formed along an inner surface of the first sidewall; an outlet path connected to the outlet portion and formed along an inner surface of the second sidewall; and a cooling flow path formed in a position where the fins are housed between the inlet path and the outlet path, wherein the inlet path and the outlet path have planar shapes asymmetrical to each other, and wherein a connection portion between the inlet path and the inlet portion is opposed to the cooling flow path immediately below the second circuit substrate arranged on the cooler, and a connection portion between the outlet path and the outlet portion is opposed to the cooling flow path immediately below the first circuit substrate arranged on the cooler, and wherein the inlet portion is installed in the first sidewall of the case; a height of an opening of the inlet portion is higher than a height of the inlet path; and the connection portion between the inlet path and the inlet portion includes an inclined surface inclined toward the cooling flow path.