3-level NPC converter phase module

摘要

Semiconductor element groups constituting a unit are mounted on a cooler heat receiving part (1) on the same plane and are adapted to radiate heat by self-cooling or cooling by wind. First and fourth semiconductor elements (Q1, Q4) are arranged on the lower side of the cooler heat receiving part, second and third semiconductor elements (Q2, Q3) are arranged in the middle, a first diode (D5) and a second diode (D6) are arranged on the upper side, the first and second semiconductor elements (Q1, Q2), as well as the third and fourth semiconductor elements (Q3, Q4) are each arranged in positions opposite to each other in a horizontal direction with respect to a centerline (Line S) of a cooler in a vertical direction.