Electrical power conversion device

Abstract

An electrical power conversion device (1) comprising: an electrical power semiconductor device (14); an electrode wiring element (13) connected to a main electrode of the electrical power semiconductor device (14); a case (30); a safety section (16) which is formed in the electrode wiring element (13) and functions as a safety device; a safety resin element (26) which is a resin element for covering the safety section (16); a sealing resin element (25) which is a resin element for sealing the electrical power semiconductor device (14), the electrode wiring element (13), the fuse section (16) and the fuse resin element (26) in the housing (30), wherein the fuse section (16) comprises, along a current flow direction, an upstream first stage section (16a1) whose cross-sectional area is smaller than that of the section of the electrode wiring element (13) on the upstream side of the fuse section (16), a second stage section (16b) whose cross-sectional area is smaller than that of the upstream first stage section (16a1), and a downstream first stage section (16a2) whose cross-sectional area is larger than that of the second stage section (16b) but smaller than that of the section of the electrode wiring element (13) on the downstream side of the fuse section (16), and wherein the length of the second stage section (16b) in the current flow direction is shorter than the length of the upstream first stage section (16a1) in the current flow direction and the length of the downstream first stage section (16a2) in the current flow direction.