Technical Documentation Dimensioning program IPOSIM for loss and thermal calculation of Infineon IGBT modules Introduction IPOSIM performs an approximate calculation of switching and conduction losses for IGBTs and free-wheeling diodes in a three phase inverter configuration under the assumption of sinusoidal output currents at inductive loads. With this tool a quick selection of a suitable Infineon IGBT module for an application is possible taking into account its average losses and thermal ratings. Be sure to always have the latest IPOSIM version on-hand. The actual program is available on Home > Product Categories > Modules and Disks > IGBT Modules > Download Service > IPOSIM. DC-link voltage, output and switching frequency, maximum junction temperature, expected case temperature, modulation factor and cos can be adapted to specific operation points. The calculation results in diagrams which are showing an estimation of the average power losses at sinusoidal currents versus the RMS phase leg current. The thermal limits of IGBT and diode part of the module (taking into account their thermal resistances and the given values for case and maximum junction temperature) are considered. IPOSIM applies an easy to use, fast and at the same time relatively exact method for loss calculation under sinusoidal output conditions. This fulfills the engineers need for first estimations on losses and thermal limits of the considered IGBT module. Points to be aware of: - IPOSIM device data are based on values given in the respective IGBT module data-sheet. The product data as well as the data used in IPOSIM may be subject to changes, improvements or corrections without prior notice. - Calculations are based on linear approximations, e.g. for the devices forward characteristics, the derivation of switching losses and assumptions e.g. for the recovery energies. Detailed informations on the calculations are given on the following pages. - Operating conditions may differ from simulation assumptions in several aspects like level of DC- link voltage, applied gate-voltage and gate-resistor, case and junction temperatures as well as the power circuit stray-inductance. Therefore deviations of parameters and assumptions used for the simulation and the real application may exist. For these reasons Infineon can not take any responsibility or liability for the exactness or validity of the programs results. The program can not replace a detailed reflection of the customers application with all of its operating conditions. Infineon Technologies AG Max-Planck-Strae D-59581 Warstein Tel. +49 (0) 29 02 7 64-0 Fax + 49 (0) 29 02 7 64-12 56 www.Infineon.comIPOSIM web tool The Excel based design spreadsheet helps to select products quickly under a variety of operating conditions. However the analytical calculations available in Excel are limited to the selection of a typical sine-triangle control, which in many cases does not reflect the actual stress a part can see under varying controller and load conditions. Therefore an online version of IPOSIM has been developed. Please visit