| 摘要 |
<p>For an electric power converting apparatus in which switching elements are cooled by using airflows caused by a vehicle's traveling, an advantageous positional arrangement for connecting, in parallel, a plurality of sets each made up of a plurality of switching elements and an advantageous structure of fins included in a cooling device are disclosed. A cooling device 50A includes a fin base 40A serving, at least, as a switching element attachment plane and a plurality of fins 42A being disposed on the opposite plane. The fins 42A are disposed to be in contact with outside air for the purpose of dissipating heat. In the case where an electric power converting circuit is a single-phase or multi-phase bridge circuit including a plurality of sets of legs each made up of a positive-side arm (UPC, VPC) and a negative-side arm (UNC, VNC), the sets of switching elements (UPC and UNC; VPC and VNC) structuring the legs corresponding to phases are arranged in a row on the fin base 40A in the traveling direction of a railway electric car.</p> |
