Johann W. Kolar

TL;DR: In this article, different gate drive topologies for SiC JFETs with respect to high temperature operation capability, limitations, dynamic performance and circuit complexity are discussed, and an experimental performance comparison of edge-triggered and phase-difference HT drivers with a conventional room temperature jFET gate driver is given.

TL;DR: In this paper, the authors present and evaluate three accurate (€ 20 ) calorimetric switching loss measurement methods, which are capable of measuring hard and soft switching losses at high speed (20-25 min/point) compared to other caloreimetric methods.

TL;DR: In this paper, the authors proposed a weight optimization of forced convection cooling systems, composed of fan and extruded fin heat sink, required for a dc-dc converter of an airborne wind turbine (AWT) system.

TL;DR: In this paper, an optimization regarding volume, efficiency and costs of AC boost inductors in 3-phase PWM converters based on detailed multi-domain models is presented for a wide switching frequency range of 5-80 kHz and a wide current ripple range of 1-100 %, considering ferrite, amorphous and powder core materials in combination with round, litz, foil and flat wire windings.

TL;DR: In this paper, the impact of wide band gap materials on the system level performance and power density of a PFC and of a DC-DC converter resulting with the new SiC devices is evaluated based on analytical optimisation procedures and prototype systems.