Johann W. Kolar

TL;DR: In this article, the authors present a new topology for a highly compact and highly efficient single-phase Power Factor Corrected (PFC) rectifier system, which consists of several interleaved boost stages which operate in a mode called Triangular Current Mode (TCM) in order to simultaneously achieve a high power density as well as a high efficiency.

TL;DR: In this article, the authors analyzed the behavior of the internal charge dynamics in high-voltage (HV) semiconductors, giving a clear base to perform overall converter optimizations and to understand the previously proposed zero-current-switching techniques for insulated-gate bipolar transistor (IGBT)-based resonant dual active bridges.

TL;DR: In this article, an air-cooled inverter system for 120 °C ambient temperature is presented, where the operation of the signal electronics and the gate driver for power semiconductors with a junction temperature of 250 °C within the specified operating temperature range is ensured by appropriate placement and cooling methods, while taking the electrical requirements for limits on the wiring inductances and symmetry requirements into account.

TL;DR: Control methods which optimize the capacitor voltage ripple are presented, analyzed and verified in simulation and the suitability of the direct modular multi-level converter is investigated.

TL;DR: In this article, a physics-inspired empirical model of the dependence of IGBT power modules' loss-relevant characteristics on the blocking voltage enables an analytic optimization of the efficiency of a cascaded Hbridges (ac-dc) converter, which is complemented by a full efficiency versus power density ηρ-Pareto optimization.