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 2740 for “"DC"”.
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DC/DC converter for offshore DC collection network
… internal interconnection. While advanced HVDC transmission has addressed the issue of long-distance transmission, internal wind farm power networks have seen relatively little innovation. Recent studies have highlighted the potential benefits of DC collection networks. First with appropriate …
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Cell modulated DC/DC converter
A very high frequency converter roughly based on a class E topology is investigated for replacing a conventional boost converter circuit. The loss mechanisms in class E inverters are characterized, and metrics are developed to aid in device selection for high frequency converter. A (30 MHz) …
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Multiple Input, Single Output DC-DC Conversion Stage for DC House
… input, single output conversion stage for the DC House was designed, simulated, and tested. This architecture allows for multiple different input sources to be used to create a single higher power output source. The design uses a DC-DC boost converter with a parallelable output which has been …
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Development of Monolithic DC -Dc Converters
… demonstrate full integration of the monolithic dc-dc converters. The experimental results confirm the feasibility of the proposed concepts and suggest a few future areas of research.
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Radio frequency dc-dc power conversion
… system architectures and circuit topologies for dc-dc power conversion at very high frequencies. The systems architectures that are developed are structured to overcome limitations associated with conventional designs. In particular, the new architectures described here structure the energy …
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Development of dc-dc converter for dc motor using fuzzy logic controller
When the DC motor is turned on, the start dc motor speed will experience overshoot at the starting speed of the motor. This overshoot will affect the current rise high as if connected to a load. The use of conventional controllers has long been used to control the dc motor and reduce overshoot …
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Current source dc-dc and dc-ac converters with continuous energy flow
… source inverters that evolve from the basic dc-dc converter topologies. The switched, large-signal, and small-signal models of these converters are presented, and used to develop control strategies for the proposed differential-mode inverters, considering their inversion and rectification …
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Current Sharing Method for DC-DC Transformers
… output converter. It can be replaced by a dc-dc transformer (DCX), which is a semi-regulated or unregulated, single output dc-dc converter. A DCX can be made using a modular design to simplify expansion of the system capacity. To realize this concept, the DCX block must have a current …
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Design of high-density dc/dc converters
… implement efficient, high-density (>50 W/in³) dc/dc converters. A low-profile high-density power stage of a 25 W dc/dc flyback ZVS-MRC is designed and built, and experimental results are shown. A high-density control circuit for a 50 W forward ZVS-MRC is designed using an integrated controller. …
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Two new families of high-gain DC-DC power electronic converters for DC-microgrids
<p>"Distributing the electric power in dc form is an appealing solution in many applications such as telecommunications, data centers, commercial buildings, and microgrids. A high gain dc-dc power electronic converter can be used to individually link low-voltage elements such as solar panels, fuel …
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Bi-directional Flyback DC-DC Converter for Battery System of the DC House Project
<p>The DC House project strongly relies on renewable energy sources to provide power to the house for various loads. However, when these sources are unable to provide power at a certain time, a back-up energy source from a battery must be readily available to fulfill the house’s power needs. This …
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Design zero-voltage switching DC-DC buck converter
… high switching frequency, zero-voltage-switching dc-dc buck converter for battery charger application. The design and analysis of dc�dc buck converter with integrated inductor is presented. The converter has been optimized to convert 12V input voltage to 5V at 1.5A maximum load current at 50MHz …
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FPGA-based digital controller for dc-dc converter
… presents a FPGA-based digital controller for a DC-DC converter. The converter topologies chosen in this project is Non-Inverting Buck-Boost converter. The main difference from DSP-based solution is that FPGA allows simultaneous execution of all control procedures. The control algorithm has been …
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High Slew Rate High-efficiency Dc-dc Converter
… in low switching frequency mainly providing DC current. Parallel ATVC has largely reduced conduction and switching losses. Parallel ATVC also reduces the number of VR bulk capacitors. Combined linear and adaptive nonlinear control has been proposed to reduce delay times in the actual …
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A Novel DC-DC Converter for Photovoltaic Applications
… a clean energy future. In this thesis, a novel DC-DC converter known as the Coupled Inductors Combined Cuk-SEPIC' (CI-CCS) converter is explored, which is particularly attractive for these photovoltaic applications. A topological modification is investigated which provides several benefits, …
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Fundamental study of dc to dc conversion systems.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1969. Ph.D.
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Radio frequency rectifiers for DC-DC power conversion
… a desire to increase the level of integration of DC-DC converters in order to take advantage of the cost and other benefits of batch fabrication techniques. While advances in the power density and integration of DC-DC converters have been realized through development of better active device …
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Topology and Control Investigation of Soft-Switching DC-DC Converters for DC Transformer (DCX) Applications
… (SST) systems, the fixed-ratio isolated DC-DC converter, namely the DC transformer (DCX), has gained significant popularity. Similar to the passive AC transformer, DCX can bidirectionally convey DC power with very high efficiency. Due to zero-voltage switching (ZVS) and a small root mean …
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Design of zero-current switching DC-DC buck converter
… project presents a zero-current switching (ZCS) DC-DC buck converter design, simulation and application. The converter control uses with ZCS technique to decrease the switching losses. Comparing to conventional buck converter, resonant buck converter includes a resonant tank equipped with …
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Planar Magnetics Design For Low-voltage Dc-dc Converters
The objectives of this thesis are to design planar magnetic devices based on accurate electromagnetic analysis and miniaturize magnetics within desired low profile as well as small footprint. A novel methodology based on FEM simulation is proposed. By introducing Maxwell 2D simulator, optimal …
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