Hybrid 3.3 kV/450 A half‐bridge IGBT power module with SiC Schottky barrier diodes

Abstract

This work presents a hybrid 3.3 kV/450 A insulated-gate bipolar transistor (IGBT) power module, utilising the halfbridge topology. In contrast to the traditional fashion, each IGBT chip in this module is allocated with two anti-parallel silicon carbide (SiC) Schottky barrier diodes (SBDs). Each SBD describes smaller footprint than the conventionally used silicone (Si) based fast recovery diode at this voltage and current level. By adopting smaller SiC SBDs in this hybrid-style packaging structure, the SBD chip yield can be greatly improved, without any additional fabrication cost. To benchmark the advantages of this hybrid power module over the Si-based counterpart, both power modules are designed, fabricated as well as tested statically and dynamically. It is shown that while both types show similar thermal behaviour, the hybrid power module describes much lower IGBT turn-on current overshooting, diode reverse recovery loss and IGBT turn-on loss. Based on the measured results, the power losses of both modules under a three-phase inverter operation condition are calculated, showing that the hybrid module has considerably lower power losses and junction temperature rise.

A review of WBG and Si devices hybrid applications

“…10 Si IGBT + SiC SBD hybrid module A simple design and development of a Si IGBT + SiC SBD hybrid module was previously described [80] , including the selection of SiC SBD diodes, the layout of direct bonded copper (DBC), and the direct cooling plate. In contrast to a conventional combination, a novel half-bridge 3.3 kV/450 A hybrid module with two anti-parallel SiC SBDs for each Si IGBT was proposed [81] . Further, using Si IGBT with fast switching characteristics in a hybrid module to improve the performance and enhance the reliability has been reported [54] .…”