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Predicting semiconductor and inductor losses together with designing the EMC filter for grid feeding inverters requires great effort, when high and variable pulse frequencies and triangular current mode are applied. In this paper an effective method is proposed to quickly evaluate the effect of circuit and control strategy on losses and inverter size. With this approach the system is modeled using...
We discuss the generation and detection of THz radiation with semiconductor diode lasers. First, we analyze the generation of THz radiation by investigating a semiconductor laser in an external cavity arrangement that supports two color operation with tunable difference frequency. Second, the opposite process, i.e., THz detection with diode lasers is investigated. For that purpose, we inject THz radiation...
Routes in a wireless network can be repaired reactively after node failures by broadcasting the message across the neighborhood of the failed node. This broadcast problem is easily solvable, if the neighborhood of every node in the network induces a connected subgraph of the communication graph. Graphs with this property are called locally connected. This paper considers the edge augmentation problem...
Eine systematische und an den Bedürfnissen der Kunden angepasste Entwicklung von Produkten kommt in der bisherigen Forschungspraxis oft zu kurz. Zwar erkennen immer mehr Unternehmen, staatliche Institutionen und Forschungseinrichtungen die Bedeutung eines systematisch geplanten und durchgeführten Technologie-Transfers. Dennoch werden technische Ideen noch immer nicht konsequent zu praktikablen Anwendungen,...
Die jüngsten Boykotte von Electrolux, BenQ oder Nokia verdeutlichen, dass deutsche Konsumenten ihre Kaufentscheidung zunehmend dazu einsetzen, Einfluss auf die Unternehmenspolitik von als übermächtig erscheinenden multinationalen Konzernen zu nehmen. Unternehmensvertreter werden ihre Entscheidungen jedoch nur dann von Protestaktionen beeinflussen lassen, wenn diese eine hinreichend große Zahl an Teilnehmern...
This paper proposes a new method to indirectly consider the magnetic material of rod core coils for Partial Element Equivalent Circuit (PEEC) simulations by adapting the number of turns. This way of modeling can be extended to the coupling effects in Common Mode (CM) chokes caused by Differential Mode (DM) currents passing through them. Thereby, sufficiently accurate instant magnetic coupling modeling...
This paper proposes a remarkably efficient modeling method of stray magnetic couplings in an Electromagnetic Compatibility (EMC) filter focusing on a dominant magnetic field in a power electronic device. The proposed modeling method is applied to a filter performance simulation of an EMC filter for a Silicon Carbide (SiC) solar inverter and its effectiveness is verified by comparing a measurement...
Knowledge of magnetic characteristics is very important for the optimal control strategies of SRM drive system [1],[2]. There are several methods to determine the magnetic characteristics such as indirect and direct methods with DC or AC voltage supplies. However, each of methods has limitations or drawbacks in determinations of computation time, inductance saturation features and an influence of...
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