Patent ID: 8675364
Filing Date: 2014-03-18
Classification: B60K,B60L,C25D,H01L,H02M,Y02T

Abstract:
1. A power module, comprising: a semiconductor element for converting DC current to AC current by switching operation; an electrical wiring board to which the semiconductor element is electrically connected, with the semiconductor element being disposed upon one of principle surfaces of the electrical wiring board; an insulating resin layer provided on another principal surface of the electrical wiring board; a first alumite layer that is formed by first alumite processing and is disposed on an opposite side of the electrical wiring board from the semiconductor element, separated by the insulating resin layer, and that is joined to the insulating resin layer; a second alumite layer that is formed by second alumite processing and is disposed on an opposite side of the insulating resin layer from the semiconductor element, separated by the first alumite layer, and that ensures electrical insulation of the semiconductor element; and a metallic heat dissipation member that is disposed on an opposite side of the second alumite layer from the first alumite layer, separated by the second alumite layer, and that radiates heat generated by the semiconductor element via the electrical wiring board, the insulating resin layer, the first alumite layer, and the second alumite layer; wherein a hole diameter of the first alumite layer is greater than a hole diameter of the second alumite layer; and wherein a thickness of the second alumite layer is greater than a thickness of the first alumite layer.