Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"Flying Capacitor"”.
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An 8-level flying capacitor multilevel converter for aircraft pulse deicing
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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A power supply circuit for gate driver of flying capacitor multi-level converters
… to provide power for the gate drivers of flying capacitor multi-level (FCML) converters. FCML converters with new GaN power switches have received increased attention due to their potential to achieve high conversion efficiency and high power density. However, one of the major challenges …
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Analysis and design of compact and efficient high step-up flying capacitor multilevel converters
This Thesis was approved for publication on 2017-04-28 at 15:10.
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A flying capacitor multilevel dual-active bridge converter for interfacing high voltage in more-electric aircraft
… resulting in bulky magnetics. The addition of a flying-capacitor multilevel (FCML) converter provides a high-frequency alternative that enables use of medium-voltage GaN technology, reduced magnetics volume, and improved theoretical efficiency across its operating range. The 6-level FCML-DAB …
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Design of a novel flying capacitor multilevel buck-boost converter for electric aircraft de-icing applications
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Failure Modes Analysis and Protection Design of a 7-level 22 kV DC 13.8 kV AC 1.1 MW Flying Capacitor Converter Based on 10 kV SiC MOSFET
… topologies (e.g. Multilevel Modular Converter or Flying Capacitor Multilevel Converter) and high voltage switches. For medium voltage applications, the most commonly employed switches are the IGBT and the IGCT. Both are silicon-based technology and are limited to a rated voltage of 6.5 kV and 4.5 …
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Improving data center power delivery efficiency and power density with differential power processing and multilevel power converters
… and by leveraging recent developments in flying capacitor multilevel converters using wide-bandgap transistors. The buck-type flying capacitor multilevel power factor correction converter presents a unique operation condition where the flying capacitor voltages are required to follow the …
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Beyond PWM: Active balancing, start-up and ZVS for multi-level converters with applications in renewable energy systems
… addresses many of the operational challenges of flying capacitor multi-level (FCML) converters and introduces new techniques to improve performance. First, start-up and a new method to extract power from within an FCML converter at a naturally occurring low-voltage node are investigated with a …
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High-density multilevel power converters for use in renewable and transportation applications
… of high-density capacitive energy storage and flying capacitor multilevel (FCML) power converters. While historically limited to energy-dense electrolytic or low-loss film-based capacitors, designers now have an increasing array of high-energy-density ceramic capacitors available to them. In …
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A hybrid switched-capacitor/inductor converter for small conversion ratios
… These improvements are made possible by adding a flying capacitor that reduces the voltage stresses on the switches and decreases the inductor size by reducing the volt-second across the inductor. The converter is implemented as an integrated circuit built in a 0.25[mu]m 5V CMOS process. …
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Multilevel Buck Converter Topologies and Their Applications
… such as E-VTOL aircraft is proposed. Flying capacitor multilevel buck topology with soft-switching operation is utilized to achieve high efficiency, light weight, and lower EMI. In case II, a modular series capacitor buck topology for high-current, low duty ratio application, such as …
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Resonant-type architectures for active power decoupling in grid-tied single-phase power electronics
… requirements with combinations of switches, capacitors, and inductors. This thesis applies resonant impedance behavior to the operation of a specific DC-side twice-line frequency buffer called a series-stacked buffer (SSB). Utilizing this equivalent impedance model, an appropriate …
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Condensed Buck-Boost Switched Capacitor Converter for Efficient Voltage Distribution in Electrified Aircraft
Switched capacitor converters are a category of power electronic converters that harness the significantly improved energy density of capacitors as opposed to that of their conventional, inductor-based counterparts to reap benefits in terms of efficiency, size, and utilization. This work presents …
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Alternative topologies for the low-voltage buck converter
… performed. The three level buck, Resonant Switch Capacitor (ResSC), and Cuk-Buck2 were selected to be studied further based on the fact that they contain few components and were discovered in this work to have the possibility of operating at fixed frequency while smoothly regulating output voltage …
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Compact and efficient power electronics with applications to solar PV, automotive, and aerospace systems
… as systems continue to scale down in size. The flying-capacitor multilevel (FCML) converter topology is of interest because it has characteristics which contribute to high power density. This work presents some different applications of the FCML converter which exhibit characteristics of high …
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Multi Resonant Switched-Capacitor Converter
This thesis presents a novel Resonant Switched-Capacitor Converter with Multiple Resonant Frequencies, abbreviated as MRSCC for both high density and efficiency non-isolated large step-down Intermediate Bus Converter (IBC). Conventional Resonant Switched-Capacitor Converter (RSCC) proposed by …
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Overcoming electro-thermal barriers to achieve extreme performance power conversion for more electric aircraft
… that would be present on some MEA concepts. The flying capacitor multilevel topology is demonstrated as an enabling technology for simultaneously achieving high-efficiency and high power-density, with specific consideration given to packaging and implementation. Reliability of the converter is …
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Addressing control and capacitor voltage regulation challenges in multilevel power electronic converters
… special control, modulation methods, and capacitor voltage regulation techniques. Both developing capacitor voltage regulation methods and addressing their associated issues with such fall within the primary focus of this dissertation. In this dissertation an investigation was conducted on …
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Toward high-efficiency high power density single-phase DC-AC and AC-DC power conversion - architecture, topology and control
… single-phase AC-DC and DC-AC conversion, and the flying capacitor multilevel topology for power transfer and waveform conversion between AC and DC. This work provides complete solutions for these ideas, including the theoretical development, design procedure, control method, hardware …
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Advanced dynamic response improvement methods for dc-dc power electronic converters
… transients. More specifically, a new three-level flying-capacitor buck dc-dc converter, a new H-bridge enhanced buck topology, an extended buck type topology, and three new transient controllers are introduced. In addition to the proposed new approaches, a comprehensive survey of the existing …
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