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A bidirectional DC-DC converter with high voltage gain and wide input and output voltage range is presented. The input voltage range is 30 V to 60 V and the output voltage range is 100 V to 400 V. The nominal power is 10 kW. The converter is based on a Dual Active Bridge in which the voltage range has been extended with a tap changer between the transformer and the high voltage H-bridge.
With ever-increasing integration of intermittent renewable energy resources in the current ac grid, the grid stability is decreasing. A potential solution to this problem is integration of large battery energy storage systems that would act as buffers for short-term grid dynamics. Since the batteries store energy in dc, a power electronic interface in the form of an inverter is inevitable for coupling...
This paper presents a programmable gate driver unit for power semiconductors such as IGBTs and MOSFETs which allows to adjust the gate voltage and gate resistance for turn-on and turn-off of the power semiconductor independently. As properties of the gate driver have a major influence on the switching behavior of power semiconductors and thus on switching losses and EMI, it is highly desirable to...
In this paper a flexible double pulse test bench for switching loss characterization of power semiconductors is presented. It allows the characterization of switching losses for conventional power semiconductors such as IGBTs and power MOSFETs, but also for modern fast switching wide bandgap devices. Contrary to alternative test bench topologies, test voltage and current can be adjusted independently...
An auxiliary resonant-commutated pole (ARCP) ensures soft switching in the entire operation range of a three-phase dual-active bridge dc-dc converter. This work evaluates the design and the resulting boost in system efficiency for different semiconductor materials and devices. Afterwards, a full-scale medium-voltage prototype of an ARCP is constructed. The subsequent measurements are presented within...
The design of modulation schemes at low pulse ratios is a known topic. However, most of previous work has focused on Optimized Pulse Patterns, e.g. Selective Harmonic Elimination (SHE). For industrial applications, standard carrier modulators are still highly attractive in many cases. Unfortunately, few papers presented insightful studies on carrier modulators at extremely low pulse ratios. This paper...
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