Mechanismen und Ursachen von Stromfehlverteilungen zwischen parallelen Hochvolt-IGBT

Zwischen parallelen IGBT treten Stromfehlverteilungen auf. Diese Fehlverteilungen haben einen Einfluss auf die Leistungsfähigkeit der Parallelschaltung. In dieser Arbeit werden für verschiedene Situation Mechanismen beschrieben, die zu Stromfehlverteilungen führen. Die betrachteten Situationen sind der Durchlass bei statischem und veränderlichem Laststrom, das Ein- sowie Ausschalten der Halbleiter, die Kurzschlussfälle I und II und das Abschalten eines Kurzschlussstroms. Für diese Situationen werden, neben der Beschreibung der Mechanismen, untersucht, wodurch diese ausgelöst werden.Current imbalances occur between paralleled IGBTs. Those imbalances affect the performance of the parallel operation. This thesis describes mechanisms which lead to such imbalances for different situations. The considered situations are on-state with static and varying load currents, the turn-on and -off of the semiconductors, short circuit types I and II and the turn-off of short circuit currents. In addition to the mechanisms which lead to current imbalances in those situations, their causes are described

Analysis of impedance and current distributions in parallel IGBT design

Power electronic applications need high voltage and current ranges which are impossible to obtain with discrete devices. Parallelization technique is a solution to increase power converter current capacity. Current distribution problems may reduce device lifetime and cause converter malfunction. Parallelization requires a total control of circuit parasitic elements which depend on layout physical materials and dimensions. The objective of this article is to show, by electromagnetic (EM) model simulations, layout non ideal effects for power circuits, in order to understand and control circuit stray elements, especially parasitic inductances, and current distributions.This work has been supported by the Department of Education, Universities and Research of the Basque Country within the fund for research groups IT978-16 and the research program ELKARTEK as the project KT4TRANS (KK-2015/00047 and KK-2016/0006l). The support of the Ministerio de Economía y Competitividad of Spain within the project DP12014-53685-C2-2-R and FEDER funds. As well as, the program to support the education of researches of the Basque Country PRE_2016_2_0086 and technical and human support provided by IZO-SGI SGIker of UPV/EHU and European funding (ERDF and ESF)