Evaluation of modern IGBT-modules for hard-switched AC/DC/AC converters

The development of IGBT devices is still moving ahead producing faster devices with lower losses. The applications become more advanced, such as a complete hard-switched AC/DC/AC power converter with almost clean input current and regenerating capabilities. This paper first focuses on a detailed characterization and comparison of eight different IGBT-modules representing state-of-the-art for both PT and NPT technologies. The voltage level of the devices is 1200 V and 1600 V/1700 V. The characterization is performed on an advanced measurement system which is briefly described. The characterization is based on static and dynamic tests for both IGBT and the diodes in the IGBT-modules at a junction temperature at 125°C. The comparison is first done directly based on conduction losses and switching losses, and later the measurements are used in a loss model for a complete AC/DC/AC power converter application. In the AC/DC/AC power converter the power losses are modelled, and different operating conditions are compared like different voltage levels in the DC-link. It is concluded dependent on operation conditions different devices will be preferable, but the high voltage devices have the highest losses even at a high operating voltage