| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable suitable cooling down of each semiconductor element regardless of individual mode operations. <P>SOLUTION: The power conversion device has three levels of which DC voltage is bisected. A plurality of switching elements Q1 to Q4 and cooling fins 31 to 33, 37 to 39 arranged on both sides of the respective switching elements Q1 to Q4, and respective flywheel diodes D1 to D4 constituting a pair with the respective switching elements and cooling fins 26 to 30 arranged on both sides of the respective flywheel diodes are constructed by each stack 2, 1. Cooling fans 26-31, 27-32, 28-35, 29-38, 30-39 are connected so as to be a series water system, which are arranged on the same sides of the switching elements Q1 to Q4 and the flywheel diodes D1 to D4 constituting a pair of with the switching elements Q1 to Q4. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
