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 42 for “"current sharing"”.
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Current Sharing Method for DC-DC Transformers
… realize this concept, the DCX block must have a current sharing feature. The current sharing method for a resonant DCX is discussed in this work. To simplify the system architecture, the current sharing method is based on the droop method, which requires no communication between paralleled units. …
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A switching ripple based current sharing control system for celluar converters
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Dynamic Performance Analyses of Current Sharing Control for DC/DC Converters
… power systems. To ensure balanced output currents among paralleled power modules, current sharing control is usually necessary.Active current sharing controls with current feedback mechanism are widely used in today's power supplies. However, the dynamic performance of these current …
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Impact of Device Parametric Tolerances on Current Sharing Behavior of a SiC Half-Bridge Power Module
… performance. Paralleling power devices increases current handling capability for the same bus voltage. However, inherent parametric differences among dies leads to unbalanced current sharing causing overstress and overheating. In this design, a symmetrical DBC layout is utilized to balance …
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Design, Optimization, and Integration of a SiC-Based Traction Inverter with Enhanced Current Sharing for Paralleled Discrete Devices
… the critical challenges in high-power inverters: current sharing among paralleled devices. In Chapter 2, the current-sharing mechanisms are comprehensively analyzed, and mathematical models are developed to describe both dynamic and static sharing. These models enable clear identification of key …
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Analysis and Optimization of the Two-Phase Series Capacitor Buck DC-DC Converter
<p>Current sharing schemes for conventional multi-phase converters are based on sensing each phase current to deliver the current information to their controllers. In conventional buck converters, this fact may require a preset current sharing ratio at the expense of efficiency, which eventually …
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Multiple Input Single Output Converter with Uneven Load Sharing Control for Improved System Efficiency
… premise of this thesis is to create uneven load current sharing between the converters at different loading conditions in order to maximize the efficiency of the overall MISO converter. The goal is to find a proper ratio of current from each converter to the total load current of the MISO system …
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Fully Distributed Control and Its Analog IC Design For Scalable Multiphase Voltage Regulators
… low supply voltage (about 1V), but very high current (maximum current is 300A in servers, 100A in desktop PCs and 70A in notebook PCs), and tighter voltage regulation. However, the size of a CPU Voltage Regulator (VR) needs to be reduced. To achieve much higher power density with decent …
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Magnetic and Thermal Design of Litzwire 500 kHz Highpower Planar Transformers with Converging Cooling Duct for “dc Transformer” Resonant Converter Applications
… power path transformer, resulting in poor current sharing. In order to balance the goals of leakage inductance minimization and even current sharing, a new winding technique called “intraleaving” is presented which reduces current sharing error from 50%, to 5%. A design rule for …
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Investigation of cryogenic cooling for a high-field toroidal field magnet used in the SPARC fusion reactor design
… are used to assess each cryogen, including the current sharing temperature, fluid inlet temperature, cable pressure drop ([delta]P), and operating pressure. From the results of the model, neon is removed from consideration due to its high required pressure drop and low temperature margins …
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On the use of fuzzy logic to control paralleled DC-DC converters
… fuzzy logic controller for the master-slave current sharing loop of a paralleled DC-DC system is presented that exhibits a considerably improved large signal performance over the presently employed, small signal designed compensators, both in terms of system response and control effort. …
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Multiple Three-Phase Induction Generators for Wind Energy Conversion Systems
… counterparts are better fault tolerance, smaller current and power per phase, and higher frequency torque ripple. This thesis examines use of a multiphase induction generator in wind energy conversion systems (WECS). In particular, multiphase generators that comprise multiple 3-phase winding sets, …
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Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries
… LED lighting application, to provide multiple current source outputs for multiple LED strings, traditional solutions usually adopt a two-stage structure, which is complicated and cost-ineffective. How to design a simple, low-cost and efficient LED driver with multiple current source outputs is …
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Low-voltage High-efficiency Fast-transient Voltage regulator Module
… Future generation processors will draw current up to 50 A ~ 100 A [2]. These demands, in turn, will require special power supplies and Voltage Regulator Modules (VRMs) to provide lower voltages with higher currents and fast transient capabilities for microprocessors. This work presents …
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Electrical, Magnetic, Thermal Modeling and Analysis of a 5000A Solid-State Switch Module and Its Application as a DC Circuit Breaker
… is capable of high-speed interruption of high currents without generating an arc, hence it is maintenance-free. Both the switch and the tripping unit are solid-state, which meet the requirements of precise protection and high reliability. The major challenge in developing and adopting a …
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Design, Implementation, and Analysis for an Improved Multiple Inverter Microgrid System
… Those challenges, including much less over current capability, the nature of the intermittent renewable energy sources, a wide-band dynamic of generation units, and a large grid impedance variation, call for more careful system hardware and control designs to ensure a reliable system …
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TECHNOLOGIES TO IMPROVE GAN-BASED LLC RESONANT CONVERTER FOR WIDE INPUT VOLTAGE, HIGH OUTPUT CURRENT AC-DC AND DC-DC APPLICATIONS
… voltage range, poor feedback performance, output current unbalance among multiply phases, and double line frequency ripple with power factor correction (PFC). Aiming at these issues, several solutions have been proposed. A single-stage LLC converter is used in power adapter applications. Voltage …
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Insulated gate bipolar transistor (IGBT) simulation using IG-Spice
… load, and by comparing the static and dynamic current sharing of paralleled IGBTs. The simulated results are verified with experimental results. Accuracy is determined by the accuracy of the required parameters extracted.
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The Implications of The Sharing Economy for Public Relations Theory and Practice: A Thematic Analysis of Airbnb, Uber and TaskRabbit
… presents a public relations perspective of the sharing economy by exploring how three prominent sharing economy companies, Airbnb, Uber and TaskRabbit, communicate to form a relationship with key stakeholders, including customers and service providers. Employing a qualitative, thematic analysis, …
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Feasibility Study of High Current Transistor D.C. Choppers
… an investigation into the feasibility of high current transistor d.c. choppers.<br/><br/>Present d.c. choppers employ thyristors and are expensive due to the turn-off circuits required. The use of low cost power transistors in electric vehicle chopper controllers is investigated, and a brief …
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