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 142 for “"dc-dc converters"”.
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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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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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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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Integrated Switching DC-DC Converters with Hybrid Control Schemes
… this urgent power crisis. Switching power converters are considered to be the best candidate due to their high efficiency and voltage conversion flexibility. Moreover, switching power converter systems are highly nonlinear, discontinuous in time, and variable. This makes it viable over a …
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ML for Loop Gain Identification of DC/DC Converters
Control loop identification is necessary for evaluating the stability of switched power supplies and is therefore an important step during design and verification. Analytical models of power supplies often yield inaccurate predictions of the loop gain; therefore, power engineers traditionally must …
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Design of DC-DC converters using Tunable Piezoelectric Transformers
This thesis introduces the ‘tunable’ piezoelectric transformers (TPT) which provide an extra control terminal, used in this case, to regulate the output voltage. A detailed mathematical analysis is done on the electrical equivalent circuit of the TPT to understand the effect of control terminal …
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System Level Black-Box Models for DC-DC Converters
… of this work is to develop a two-port black-box dc-dc converter modeling methodology for system level simulation and analysis. The models do not require any information about the components, structure, or control parameters of the converter. Instead, all the information needed to build the models …
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Control And Topology Improvements In Half-bridge Dc-dc Converters
… transient response are two key requirements for DC-DC converters. Topology and control are two key topics in this dissertation. A variety of techniques for DC-DC converter performance improvement are presented in this work. Focusing on the efficiency issue, a variety of clamping techniques …
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Experimental investigation of semiconductor losses in cryogenic DC-DC converters
… This Thesis studies the performance of several DC-DC power conversion techniques at temperatures down to 20 K. In particular hard switching, synchronous rectifier, zero-voltageswitching and multi-level circuit prototypes are examined, focusing on the losses in the semiconductor devices. The …
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Spread spectrum modulation system for burst mode DC-DC converters
… develops a spread spectrum switching system for DC-DC converters operating in burst mode. Burst mode DC-DC converters have high efficiency under low-power conditions in applications such as cell phones and notebook computers, but often produce noise in the audible range. This thesis explores a …
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Design of High-Performance Piezoelectric Transformer-Based DC-DC Converters
… most attempts at magnetic-less PT-based dc-dc converters have limited whole-converter efficiencies. These attempts typically rely on standard resonant converter topologies not designed to effectively utilize PTs, along with off-the-shelf PTs not optimized for dc-dc power conversion. In …
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DC-DC converters with high efficiency over wide load ranges
… circuit design, and test results. This DC-DC converter introduces several novel circuits which enable more efficient operation at output powers from l00J.1W to lW. Efficiency above 80% is achieved from 500JlW to 500mW. Specifically, depending on the load current, the regulator …
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EMI Characterization and Improvement of Bi-Directional DC/DC Converters
… efficiency, high voltage ratio bi-directional DC/DC converter for fuel cell energy system management. In this paper, two bi-directional DC/DC converters, which are developed for Ford Motor Company’s fuel cell vehicle, are compared from different aspects. Comparison is concentrated on the …
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Novel DC/DC Converters For High-Power Distributed Power Systems
… approach for high-power three-phase DPSs, the DC-link voltage coming from the power factor correction (PFC) stage penalizes the second-stage DC/DC converter. This DC/DC converter not only has to meet the characteristics demanded by the load, but also must process energy with high efficiency, …
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Integrated magnetic components for high-power high-current dc-dc converters
… for use in high-power high-current power converters employed in renewable energy applications. These applications require low-cost, high efficiency and high-power density magnetic components and the use of IM structures can help achieve this goal. A novel CCTT-core split-winding integrated …
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Fully integrated dc-dc converters with basic and double galvanic isolation
The increasing demand of low-profile power converters in modern electronic devices has pushed research towards integrated systems able to replace expensive and bulky solutions based on discrete components. Consequently, galvanically isolated interfaces are becoming an interesting research topic for …
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Mass Minimization of DC -Dc Converters in Portable Electrical Energy Sources
This dissertation presents a methodology for optimal design of portable energy-source systems, leading to an increase in specific energy density. The interaction between the source and converter is considered, which can result in a different system design than when the components are considered …
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Radio frequency dc-dc converters : device characterization, topology evaluation, and design
… it affords for improved performance. Dc-dc converters operating at high frequencies use smaller-valued energy storage elements, which tend to be physically smaller and lower-cost, and this can result in improved transient performance while retaining high efficiency. One way to achieve …
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