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 19 of 19 for “"AC-DC converters"”.
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Bi-Directional AC-DC Converters for Electric Vehicles
… Nowadays transportation sectors are replacing their conventional internal combustion vehicles by Electric Vehicles (EVs). Much research efforts have been devoted to improve EVs and EV infrastructure. EV battery and thus the on-board EV battery charger are among the most important parts of …
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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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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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Investigation of High Performance AC/DC Front-End Converter with Digital Control for Server Applications
… density is still a big challenge for front-end AC/DC converters. For DPS systems, front-end AC/DC converters are under the pressure of continuous increasing power density requirement. Although increasing switching frequency can dramatically reduce the passive component size, its effectiveness is …
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Bridgeless Active Power Factor Correction Using a Current Fed Push Pull Converter
<p><a></a><a><strong>ABSTRACT</strong></a><strong></strong></p> <p>Bridgeless Active Power Factor Correction</p> <p>Using a Current Fed Push Pull Converter</p> <p>Jeramie Seth Bianchi</p> <p> Switched Mode Power Supplies have become increasingly popular for efficient methods of delivering power to …
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Observer based fault detection filters for three-phase inverters and statcoms
… which are sometimes crucial in determining the exact health of power electronic circuit components. This thesis develops and experimentally demonstrates a class of model-based fault detection and isolation filters for three-phase AC-DC power electronics systems that is able to detect all possible …
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Toward high-efficiency high power density single-phase DC-AC and AC-DC power conversion - architecture, topology and control
Power conversion between the single-phase AC grid and DC sources or loads plays an indispensable role in modern electrical energy system for both generation and consumption. The renewable resources and electrical energy storage are integrated to the grid through inverters. Telecoms, data centers …
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Three-Phase Power Factor Correction Circuits for Low-Cost Distributed Power Systems
Front-end converters with power factor correction (PFC) capability are widely used in distributed power systems (DPSs). Most of the front-end converters are implemented using a two-stage approach, which consists of a PFC stage followed by a DC/DC converter. The purpose of the front-end converter is …
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Control and operation of SMES and SMES/PV systems
… that a SMES system implemented with standard AC/DC converters offers energy storage capacity large enough, and dynamic response fast enough, to compensate for PV fluctuations due to changes in weather conditions. The method of control is developed so that the charging and discharging of the …
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Miniaturization of Ac-Dc power converters for grid interface
In this thesis we present a two-stage ac/dc grid-connected converter for computer applications. Also known as off-line power supplies, these converters have to meet various demanding specifications such as a wide input voltage range (typically 0-376 V), large voltage step down (typical output …
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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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Advanced Single-Stage Power Factor Correction Techniques
Five new single-stage power factor correction (PFC) techniques are developed for single-phase applications. These converters are: Integrated single-stage PFC converters, voltage source charge pump power factor correction (VS-CPPFC) converters, current source CPPFC converters, combined voltage …
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Control of DC Power Distribution Systems and Low-Voltage Grid-Interface Converter Design
DC power distribution has gained popularity in sustainable buildings, renewable energy utilization, transportation electrification and high-efficiency data centers. This dissertation focuses on two aspects of facilitating the application of dc systems: (a) system-level control to improve load …
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Investigation of High-density Integrated Solution for AC/DC Conversion of a Distributed Power System
… and high reliability. Due to limited space and increasing power consumption, power supplies for telecom and server systems are required to deliver more power with smaller volume. As the key component of DPS system, front-end AC/DC converter is under the pressure of continuously …
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Design of High-Density Filter Building Blocks for SiC-based Three-Phase Power Converters
… minimize the size of passive components such as DC-link capacitors and line harmonic filters. Unfortunately, with faster switching speeds and high slew rates, the common-mode (CM) and differential-mode (DM) conducted emissions interference (EMI) noise is worsened. The effects are manifested at …
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Novel Voltage Control Methods for quasi-Z-source Network Converters with Focus on Fixed DC-Link Voltage, Constant- Frequency and Soft-Switching Operation
Power electronic converters reinforce modern energy systems by enabling efficient power transfer among batteries, renewable sources, and the utility grid. quasi-Z-source (qZS) converters are especially attractive for their single-stage buck–boost capability, continuous input current, and inherent …
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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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High performance electronic systems for high bay light emitting diodes fed from alternating current power grids
… to their reliability, long life, luminous efficacy and low maintenance requirements. However, LEDs are diodes, which means that the current is able to go through them in only one direction. This fact is of utter importance because of the direct relationship between the light outputted by the LED …