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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 33 for “"ac/dc converter"”.
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A single stage power factor corrected AC/DC converter
Applications for AC/DC converters that require high input power factor has been traditionally implemented by two power stages. In order to provide a cost effective and high density solution for low power applications, this thesis proposes a single stage isolated converter topology designed to …
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A single stage full bridge power factor corrected AC/DC converter
Conventional single phase AC/DC converters use a two stage power configuration to provide a regulated DC power supply at high input power factor. Elimination of one of these stages can reduce the cost, weight, size, complexity and increase the overall reliability of this converter. This thesis …
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A fast analog controller for a unity power factor AC/DC converter
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Design and development of a traction motor emulator using a three-phase bidirectional buck-boost AC-DC converter
An industrial drive testing, with a ‘real-machine’ can pave way, for some serious issues to test-bench, motor, and the operator. A slight disturbance in control logic amid testing, can damage the physical machine or drive. Such dangerous testing conditions can be avoided by supplanting real motor …
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Microcontroller Design of a Bidirectional Three-Level Pulse Width Modulation AC/DC Converter for Vehicle-to-Grid Application
… the implementation details for a Three-Level PWM AC-DC based charger. Although the three-level PWM AC-DC design requires a more complex controller than its counterparts, Matlab Simulink simulations show the design provides lower total harmonic distortion (THD) and reduced stress to the charger’s …
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A High-Efficiency Grid-Tie Battery Energy Storage System
… system (BMS), a high-efficiency bidirectional ac-dc converter and the central control unit which controls the operation mode and grid interface of the energy storage system. The BMS estimates the state of charge (SOC) and state of health (SOH) of each battery cell in the pack and applies active …
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Design and implementation of a universal onboard battery fast charger for transportation electrification applications
… of the EVs. Due to safety limitations and the lack of charging infrastructure, 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 …
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Stacked-Switched Electrolytic Capacitor-less AC/DC Power Converters
… Vehicles (EVs) has increased the demand for compact, efficient, and reliable On-Board Chargers (OBCs) capable of interfacing directly with the AC grid. Conventional single-phase AC/DC converters often depend on bulky electrolytic capacitors, diode bridges, and hard-switching circuits, leading to …
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Soft-switching techniques for high-power PWM converters
… of the power semiconductor devices in a power converter. This work presents several soft-switching topologies for high power PWM converters. These new topologies achieve soft-switching functions with minimum increase of device voltage/current stresses and converter circulating energy, and thus …
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Optimal vertical plane booster guidance including pitch dynamics
… of the power semiconductor devices in a power converter. This work presents several soft-switching topologies for high power PWM converters. These new topologies achieve soft-switching functions with minimum increase of device voltage/current stresses and converter circulating energy, and thus …
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Design and implementation of a converter with wide operating range using a Variable-Inverter-Rectifier-Transformer structure
… such as cell phones, tablets, and laptops characterized by the low-voltage load are supplied by a single-phase grid-tied ac-dc converter. Achieving miniaturization and high efficiency of power supplies in this application is challenging due to the large voltage conversion ratios and the large …
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Characterization and Application of Wide-Band-Gap Devices for High Frequency Power Conversion
… of cascode GaN HEMT is studied at first. An accurate behavior-level simulation model is developed with comprehensive consideration of the impacts of parasitics. Then based on the simulation model, detailed loss breakdown and loss mechanism analysis are studied. The cascode GaN HEMT has high …
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Characterization and Modeling of 4H-SiC Low Voltage MOSFETs and Power MOSFETs
… power devices, and power systems will become compact, robust and more efficient. A new low voltage process in 4H-SiC has been characterized and modeled. In order to design circuits with the low voltage process, designers need accurate device models for simulation. Currently, there exist no compact …
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High frequency power conversion architecture for grid interface
With the present ac-voltage distribution system, ac-dc converters are key components for driving many dc voltage applications from the ac grid voltage. There are a lot of electronic devices that natively operate from the dc voltage including light emitting diodes (LEDs), personal and laptop …
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Control and operation of SMES and SMES/PV systems
Applications, converter topologies, and control schemes are examined for superconductive magnetic energy storage (SMES) systems. Diurnal load leveling for electric utilities and compensation for fluctuations in photovoltaic (PV) power generation are the primary applications discussed. It is …
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A Three-Phase Single-Stage AC-DC ZVZCS PWM Full-Bridge Converter
It is standard practice to use two separate power converters to convert an ac input voltage to a desired and isolated dc output voltage. A front-end ac-dc converter is used to convert the input ac voltage into an intermediate dc voltage which is then fed into a dc-dc converter with transformer …
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A Three-Phase Single-Stage AC-DC ZVZCS PWM Full-Bridge Converter
It is standard practice to use two separate power converters to convert an ac input voltage to a desired and isolated dc output voltage. A front-end ac-dc converter is used to convert the input ac voltage into an intermediate dc voltage which is then fed into a dc-dc converter with transformer …
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Control, Analysis, and Design of SiC-Based High-Frequency Soft-Switching Three-Phase Inverter/Rectifier
… (CRM) high-frequency soft-switching three-phase ac-dc converters (inverter and rectifier). The soft-switching technique with SiC devices grounded in CRM makes the operation of the ac-dc converter at hundreds of kHz possible while maintaining high efficiency with high power density. This is …
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Investigation of a GaN-Based Power Supply Topology Utilizing Solid State Transformer for Low Power Applications
… (GaN) power devices exhibit a much lower gate capacitance for a similar on-resistance than its silicon counterparts, making it highly desirable for high-frequency operation in switching converters, which leads to their significant benefits on power density, cost, and system volume. High-density …
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