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 17 of 17 for “"series connection"”.
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Turn-Off Voltage Sharing of Field-Stop IGBTs in Series Connection under Inductive Load Conditions
… Insulated Gate Bipolar Transistors (IGBTs) in series connection is attractive to many power electronic applications, including converters, hybrid circuit breakers, etc. To operate IGBTs in series connection, regulating the voltage sharing between the IGBTs during the IGBT turn-off is essential. …
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Series-Connection of Silicon Carbide MOSFET Modules using Active Gate-Drivers with dv/dt Control
… voltage SiC MOSFET modules operated as a single series-connected switch using active gate control. Both multilevel and two-level topologies are capable of achieving higher blocking voltages in high-power converter applications. Compared to multilevel topologies, two-level switching topologies are …
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DC/DC converter for offshore DC collection network
… the electrical networks that will provide interconnection of turbines and onward transmission to the onshore power network. High wind farm capacity combined with a move to larger wind turbines will result in a large geographical footprint requiring a substantial sub-sea power network to provide …
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A novel concept of series connected multi-phase, multi-motor drive systems
… of multi-phase machines and VSIs, and series connection of all the machines in the group. Application of a single multi-phase VSI in conjunction with multi-phase machines generates additional degrees of freedom. The research presented here utilises these additional degrees of freedom to …
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An integrated generator-rectifier system for high-power AC-DC conversion
… magnet synchronous generator (PMSG) with series-stacked power converters to create an integrated generator-rectifier system. An active rectifier process only a fraction of the total converted power while regulating the dc bus. Diode bridges process the remaining power, allowing substantial …
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Protection, Control, and Auxiliary Power of Medium-Voltage High-Frequency SiC Devices
… problem of the SiC MOSFET. For SiC MOSFETs in series-connection, the unbalanced voltages can result in system failure due to device breakdown or unbalanced thermal stresses. By injecting current during the turn-off transient, an active dv/dt control method is used for voltage balancing. A 6 kV …
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The topology and electrical properties of nanoparticle networks
… was shown to be linearly related to parallel connections of the minimum paths of particles through the aggregates as determined from the analysis of ultra-small angle X-ray scattering data. The capacitance of the layers was shown to have a linear dependence on both the separation between …
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Device Voltage Balancing from Device-level to Converter-level in High Power Density Medium Voltage Converter using 10 kV SiC MOSFETs
… components like turn-on snubbers. Devices in series are required to reach higher voltage. High-frequency HV converter in two-level or three-level bridges running 20 kHz or higher in many emerging applications, like MVDC networks with high-frequency transformers and energy storage integration …
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Novel DC/DC Converters For High-Power Distributed Power Systems
… meet these requirements, approaches such as the series connection of converters and converters that reduce the voltage stress across the main devices have been proposed. In order to improve the characteristics of these solutions, this dissertation proposes high-efficiency, high-density DC/DC …
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Model realization using sensitivity functions
… the hybrid pi transistor model and possibly a series, parallel, series-parallel, or parallel-series connection would prove even more beneficial than the cascaded block time domain approach.
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The Cellular Basis for Hearing
… MET channels, which are connected either in series or in parallel. We found that series connection model predicts double minima of the hair bundle stiffness with respect to the hair bundle displacement if the minimum is below a certain positive value. In contrast, the parallel connection …
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Smart inverters for seamless voltage and frequency dynamics in microgrids
… smart load configuration is obtained via series connection of electric dampers (EDs) with critical loads to cope with disturbances at the point of critical loads. A systematic approach is presented for modeling of the proposed smart loads considering the switching states of EDs. The …
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DC-DC converter designs for medium and high voltage direct current systems
… insulated gate bipolar transistor - IGBT) of the series switch arrays in the conventional two-level DAB design. With auxiliary active circuits, series connected IGBTs effectively become series connection of half-bridge submodules (cells) in each arm, resembling the modular multilevel converter …
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Energy-efficient Interfaces for Vibration Energy Harvesting
… power output of a piezoelectric transducer, a series connection configuration scheme is proposed, which splits the electrode of a harvester into multiple equal regions connected in series to inherently increase the open-circuit voltage generated by the harvester. This topology passively …
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The development and operation of plant microbial fuel cells using municipal sludge
… was more efficient than connecting them in series. The peak power densities followed the order of: parallel connection 443 mW/m3 , series connection 296 ± 46 mW/m3 and 156 ± 17 mW/m3 for the control. The third optimisation experiment was focused on varying electrode distance. It was noticed …
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Investigation of Power Semiconductor Devices for High Frequency High Density Power Converters
… paralleling low current rating power MOSFETs or series low voltage rating IGBTs to achieve high frequency high power output, because power MOSFETs and low voltage IGBTs can operate at high switching frequency and have better thermal handling capability. However the current sharing issues caused …
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Active Source Management to Maintain High Efficiency in Resonant Conversion over Wide Load Range
… voltage-blocking switches, which consist of a series connection of a diode and a transistor. The series diode experiences significant conduction loss because of large on-state voltage. The control of the output current amplitude for constant-frequency inverters requires a pre-regulation stage, …