eNERGY CONVERSION DEVICE AND MIT THE SAME eQUIPPED RAILWAY VEHICLE

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A power conversion device for a railway vehicle has a heat receiving member 5, power semiconductor elements 70-73, 80-83 and 90-93 emitting different amounts of heat, heat pipes 1-4, and fins 6 attached to the heat pipes. The power semiconductor elements are disposed on one surface of the heat receiving member, whilst the heat pipes are disposed on the other surface. The heat pipes have heat radiation portions and heat receiving portions. There are two kinds of heat pipes having different lengths of heat receiving portions, the heat receiving portions being arranged so that their longitudinal direction is substantially perpendicular to a flow direction of a cooling air flowing in the heat radiation members. The heat pipes having shorter heat receiving portions are located inside of a projection region of the power semiconductor elements emitting more heat, and the heat pipes having longer heat receiving portions are arranged across the inside and the outside of a projection region of the power semiconductor elements emitting less heat. This provides more efficient cooling.