Patent ID: 7274569

Claim:
A power conversion device comprising: a power conversion module; a control circuit board on which a control circuit to control said power conversion module is arranged; a heat sink serving to radiate generated heat of said power conversion module; and a case that contains therein said power conversion module and said control circuit board; wherein said case is divided into a module case that contains said power conversion module and a control circuit case that contains said control circuit board; there are provided a power conversion module section in which said power conversion module and said heat sink are thermally coupled, said power conversion module is contained in said module case in such a manner that a radiator fin of said heat sink is exposed to outside, and one side of said module case is put in an open state; and a control circuit section in which said control circuit board is contained in said control circuit case, and one side of said control circuit case is put in an open state; and respective opening sides of said power conversion module section and said control circuit section are opposite to each other, a heat insulating partition wall functioning to do heat rejection is inserted between the opposite portions, and then said power conversion module section and said control circuit section are coupled.