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 109 for “"charger"”.
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Tiny Piezoelectric Energy-Harvesting CMOS Charger
… of the energy from vibration. Moreover, the charger is lossy, and imposes limits on the operation. The objective of this research is to study, evaluate, design, build, test, and assess energy-harvesting CMOS battery chargers that draw and output the most power possible from ambient motion …
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Integrated Microbattery Charger for Autonomous Systems
… for autonomous microsystems. The battery charger chosen for this design is a constant current battery charger. Two methods of regulating the constant-current are discussed. A published shunt regulator design is analyzed and is presented with enhancements to the design. A series regulator …
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New architecture for USB powered battery charger
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2008.
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Optimization of spacecraft battery charger/discharger systems
… Observing System (EOS) satellite battery discharger. Experimental verification is provided. A novel zero-voltage-switching (ZVS) bidirectional converter topology is presented. A bidirectional battery charger / discharger has several advantages, including a potentially substantial system …
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Peak power tracking for a solar buck charger
This thesis discusses the design, implementation, and testing of a buck converter with peak power tracking. The peak power tracker uses a perturb and observe algorithm to actively track the solar panel's peak power point and a global sweep algorithm accounts for startup and multiple local maxima. …
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Modeling and analysis of spacecraft battery charger systems
Large-signal analysis of various spacecraft power systems is performed to predict the bus dynamics in various modes of operation. The large-signal trajectories of the system's operating point are analyzed employing qualitative graphical representation. The analyses are verified through simulation …
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Supecapacitor-assisted Temperature Modification Apparatus (SCATMA) and Fast Supercapacitor Charger
… the unique two-stage fast supercapacitor charger, a battery-supercapacitor hybrid system was developed for SCATMA as a commercially viable solution for rapid water heating. Dividing a supercapacitor bank into three parts and circulating them through a `charge-idle-discharge' sequence was …
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Redesign of a human powered battery charger for use in Mali
The design for a human powered battery charger was analyzed and a redesign was proposed. The original product was designed in the MIT ME course 2.009 to power a LED projector that will be used to teach literacy classes in Mali. The goals of the new design are to decrease the cost and usability of …
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A low ripple bi-directional battery charger/discharger using coupled inductor
There are two important issues about a spacecraft power conversion system: low ripple current flowing through both battery and bus, and bi-directional power flow to and from the battery. This thesis introduces a novel low ripple current bi-directional battery charge/discharge converter using …
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Design of a battery charger for the NASA EOS space platform
A battery charger design for the NASA Earth Observing System (EOS) Space Platform has been developed and tested. This thesis discusses the design of the battery charger power stage and its current and voltage control loops. The charger was designed to minimize the mass and to maximize the …
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Modeling, simulation, and design of hybrid EV-battery charger for optimum grid utilization
The rapid recent development of electric vehicles (EVs) charging system, is changing the future of the transportation sector. Thanks to Photovoltaics solar energy (PV), the EV charging operating cost is reduced, and an environmentally friendly EV is promoted to the public. In this thesis, an …
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Medium voltage extreme fast charger based on novel medium voltage SiC power devices
… of a 4.16kVac/800Vdc three phase 150kW fast charger which uses a modular single-phase single-stage isolated ac/dc power converter in each phase. Novel 7.2kV/60A SiC Austin SuperMOS devices are used as the medium voltage power electronic switches and soft-switching over the entire range of …
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Design and analysis DC/DC boost converter using pi controller for battery charger application
… (PI) controller for battery charger application has been improved. In power field the DC/DC converters are electronic devices used to change DC electrical power efficiently from one voltage level to another. Operation of the switching devices causes the inherently nonlinear …
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Design and implementation of a universal onboard battery fast charger for transportation electrification applications
… most of EVs are opted with a two-stage on-board charger (OBC) that allows charging of battery packs from standard utility sockets (85-265 V) as per SAE J1772. Existing EVs such as Neighborhood Electric Vehicles (NEVs), Plug-in-hybrid Electric Vehicles (PHEVs), forklifts, golf kart, and buses have …
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PCB-Based High-Power DC/DC Converters with Integrated Magnetics for Battery Charger Applications
… of EVs is hindered by the need for an on-board charger system that is both lightweight and efficient. EVs utilize two main charging methods: on-board chargers (OBC) for regular charging and off-board (fast) chargers for quick refills of battery pack. Most EVs currently use 400V battery packs …
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High Frequency Bi-directional DC/DC Converter with Integrated Magnetics for Battery Charger Application
… a lightweight, compact, yet efficient on-board charger system. Since the state-of-the-art Level 2 on-board charger products are largely silicon (Si)-based, they operate at less than 100 kHz switching frequency, resulting in a low power density at 3-12 W/in3, as well as an efficiency no more than …
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Analysis, Design and Validation of Converter for Electric Vehicles charger connected to tram DC grid
L'abstract è presente nell'allegato / the abstract is in the attachment
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High Efficiency DC-DC Converter for EV Battery Charger Using Hybrid Resonant and PWM Technique
The battery charger plays an important role in the development of electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs).This thesis focuses on the DC-DC converter for high voltage battery charger and is divided into four chapters. The background related to EV battery charger is …
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Design and Control of a Compact 7.2 kW GaN-Based Bidirectional Isolated On-Board Charger (OBC)
… advancements in bidirectional onboard chargers (OBCs) for electric vehicles, addressing critical challenges in power factor correction, efficiency, and power density. The research introduces innovative control strategies and hardware designs by incorporating high power GaN switches that …
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