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 31 for “"battery charger"”.
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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
… processing systems. Emphasis is placed on the battery charge and discharge systems. A comparison of several battery charge and discharge topologies is presented. Characteristics which effect the overall system performance are addressed including size, weight, efficiency, dynamic performance, …
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Modeling and analysis of spacecraft battery charger systems
… dynamic characteristics of spacecraft battery charge converter systems are analyzed to facilitate the design of control loop for optimum performance and stability. Control-loop designs for the charge converters in bus voltage regulation mode, charge current regulation mode, and peak …
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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
… 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 coupled-inductor. Bi-directional switch structures and proper control …
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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
… of the realized model while indicating the battery charging state as well as the power flow between the grid, battery and PV for different irradiation.
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Design and analysis DC/DC boost converter using pi controller for battery charger application
… using Proportional-Integral (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 …
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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
… and more attention. PEVs have a rechargeable battery that can be restored to full charge by plugging to an external electrical source. However, the commercialization of the PEV is impeded by the demands of a lightweight, compact, yet efficient on-board charger system. Since the …
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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 of a multi-module multi-phase battery charger for the NASA EOS space platform testbed
… testing of a multi-module, multi-phase (MMMP) battery charger for the NASA Earth Observing System (EOS) is presented. The MMMP converter is comprised of four independent buck converters switched 90° out of phase. The MMMP charger is compared to a single module battery charger, and shown to …
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GaN-Based High-Efficiency, High-Density, High-Frequency Battery Charger for Plug-in Hybrid Electric Vehicle
… control can improve the power density of battery chargers for the plug-in hybrid electric vehicle. Gallium nitride (GaN) devices are used to increase switching frequency and shrink passive components. An innovative DC link reduction technique is proposed and several practical design issues …
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Design of a high-efficiency, high-performance zero-voltage-switched battery charger-discharger for the NASA EOS space platform
… of two Zero-Voltage-Switched Bidirectional Battery Charger Discharger (ZVS-BBCD) units into a space power system is shown. A robust design featuring: four interleaved phases, commandable charge rates, overcurrent protection, overvoltage protection, soft starting, reliable gate drive …
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Investigation and Design of Integrated Magnetics in High-power High-frequency Soft-switching DC/DC Converters for Battery Charger Applications
… years. These vehicles rely on rechargeable battery packs that can be charged by external power sources. Despite their benefits, widespread adoption of EVs faces challenges like on-board chargers (OBC) with lighter weight, higher efficiency and higher power. There are two charging approaches …
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Development of a single phase active Power filter for rectifier load
… (APF) to compensate harmonics generated by battery charger. The presence of the harmonics leads to various problems and poor power quality. The objectives of this project are to reduce the harmonic distortion of the single-phase system with battery charger load. The operation of APF is …
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Integrated Microbattery Charger for Autonomous Systems
<p>This thesis presents a microbattery recharging circuit suitable 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 …
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Design zero-voltage switching DC-DC buck converter
… 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 switching frequency. The …
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Analysis and simulation of dynamics of spacecraft power systems
… for various operating modes, such as the shunt, battery-charge and battery-discharge modes, as well as the transition mode. Computer models using the EASY5 program are developed for the Direct Energy Transfer (DET) system, solar array switching system and partial shunt system to facilitate …
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Energy Management System in DC Future Home
… is still challenging. High voltage lithium-ion battery should be seriously considered concerning the overcharge/over-discharge risk. Dissipative cell equalization and its performance are studied. Non-dissipative equalization methods are reviewed using an energy flow chart. Typical charging …
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