Patent ID: 8072760
Filing Date: 2011-12-06
Classification: H01L,H05K

Abstract:
1. A power convertor comprising: a cooling path forming body forming a path for refrigerant, and a power module fixed to the cooling path forming body and including a plurality of power semiconductor chips for converting a direct electric current to an alternating electric current, wherein the power module further includes a base plate, a heat radiating element fixed to a surface of the base plate through a brazing material, and an insulating substrate, a surface of which is fixed to another surface of the base plate through a solder layer, and the base plate is made of copper alloy including a material whose hardness is higher than a hardness of copper, has a hardness not less than HV50, and has a thermal conductivity not less than 200 W/mK, wherein the cooling path forming body includes an opening communicating with the path, the heat radiating element projects from the opening into the path, the power module is fixed to the cooling path forming body in such a manner that the opening is closed by the base plate, wherein each of the power semiconductor chips is fixed to another surface of the insulating substrate through a second solder layer, and a melting point of the second solder layer is lower than a brazing temperature of the brazing material through which the heat radiating element is fixed to the surface of the base plate, and higher than a melting point of the solder layer.