INVERTER PHASE LEG USING PARALLEL CONNECTED IGBTs FOR HIGH POWER SNUBBERLESS INVERTER

摘要

This invention relates to an inverter phase leg module using parallel connected IGBTs for high power snubberless three phase inverter, said inverter phase leg module comprising an assembly of a heat sink (1) having a blower (2) mounted on top of said heat sink, plurality of IGBTs (3) are mounted on said heat sink and said IGBT, having positive busbar (4) connected to the collector terminals of IGBTs, and negative busbar (5) connected to emitter terminals of the bottom IGBTs and the AC output phase busbar (6) is formed by connecting the emitter terminals of the top IGBTs, a plurality of capacitors (7) mounted between a pair f of fiberglass sheets one at the bottom (8) and the other at the top (9) of the capacitor bank having DC input, positive busbar (10) and a negative busbar (11) and discharge resistors (12) connected between positive and negative busbars of paralled capacitors and the IGBT (3) assembly and the capacitor (7) assembly is connected by positive connecting busbar (13) and negative busbar (14), said positive connecting busbar (13) i* provided with a current sensor (15) connected to a fault detection and protection circuit (16).