Accurate Prediction of Thermal Runaway at Blocking Conditions in Drives Applications

Konferenz: PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07.05.2019 - 09.05.2019 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2019

Seiten: 5Sprache: EnglischTyp: PDF

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Philippou, Alexander; Mueller, Christian R.; Niedernostheide, Franz-Josef; Sahan, Benjamin (Infineon Technologies AG, Germany)

One promising way to increased power densities of IGBTs and higher output currents of modules is to increase the maximum junction temperatures. With higher junction temperatures and with respect to the used load profiles, the impact of leakage current generated during blocking becomes more and more important. An extension of a power-loss calculation framework is proposed. It enables a fast and accurate calculation of temperature-dependent switching, conduction and blocking losses for a single-phase PWM inverter application for various overload profiles, predicting thermal runaway. Numerical implementation of the algorithm is described, and a critical amount of chip leakage current is determined as a function of different thermal heatsink capacitances.