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Influence of control and output-quality constraints on the scalability and optimization of multi-branch multi-level flying capacitor converters

Kräwinkel, R.W. (2022) Influence of control and output-quality constraints on the scalability and optimization of multi-branch multi-level flying capacitor converters.

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Abstract:The usage of multi-branch multi-level Flying Capacitor Converters (FCCs) is increasing, driving the need for fundamental scaling laws relating constraints (i.e. output quality, control bandwidth, and lifetime) to design variable limits in the context of system optimization. In contrast to other multiobjective design papers, not just the design variables (number of levels, branches, and parallel FETs, switching frequency, and output filter), but also the constraints are varied to identify these relations. The basis for the analysis is a gradient amplifier for Magnetic Resonance Imaging (MRI) systems, an application that can benefit from the advantages the FCC topology brings (i.e. low noise, and easily scalable power output). It is shown how the output quality and control bandwidth constraints provide design limits for the FCC designs through the effective switching frequency, a combination of the switching frequency, number of levels, and the number of branches, but not through these design variables directly. The relations between the three constraints and costs are also discussed, furthermore, it is shown that the most cost-effective designs (for MRI) have a 40% to 50% margin on the rated semiconductor voltage and current, which is largely driven by the lifetime constraint.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Electrical Engineering MSc (60353)
Link to this item:https://purl.utwente.nl/essays/92492
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