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 92 for “"rectifiers"”.
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Control of Harmonics in 6-Pulse Rectifiers
… using 18-pulse and 24-pulse phase shifting rectifiers.</p>
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The output voltage of controlled polyphase rectifiers
The controlled polyphase rectifiers in current use employ delayed firing in some degree to obtain voltage control. Delayed firing increases the harmonic content of the rectified voltage to such an extent that the harmonics determined without firing delay are insignificant. The harmonic content …
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Advanced active rectifiers for electric vehicle battery charging
… error reduction in single phase full bridge rectifiers in addition to digital current control using delta modulation. The final section builds upon a more advanced interleaved full-bridge topology by introducing more accurate inductor voltage and current equations while also applying gain …
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Radio frequency rectifiers for DC-DC power conversion
A significant factor driving the development of power conversion technology is the need to increase performance while reducing size and improving efficiency. In addition, there is a desire to increase the level of integration of DC-DC converters in order to take advantage of the cost and other …
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Epitaxial Gallium Oxide Heterojunctions for Vertical Power Rectifiers
… makes Ga2O3 a prime candidate for vertical power rectifiers as thick, high quality drift regions are a necessity for high voltage devices such as the PN diode, junction barrier Schottky (JBS) diode, merged-PiN-Schottky (MPS) diode, and Schottky barrier diode (SBD). However, Ga2O3 exhibits a lack …
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SiC-Based High-Frequency Soft-Switching Three-Phase Rectifiers/Inverters
Three-phase rectifiers/inverters are widely used in grid-tied applications. Take the electric vehicle (EV) charging systems as an example. Within a certain space designated for the chargers, quick charging yet high efficiency are demanded. According to the current industry practice, with a power …
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Modeling and Simulation of Parallel D-STATCOMs with Full-Wave Rectifiers
… These D-STATCOMs also utilize parallel full-wave rectifiers that directly connect the ac grid to the dc capacitor of the D-STATCOMs. Parameters such as power loss, reaction time, stability, and THD are measured for several test scenarios. Results from this thesis show that two D-STATCOMs operating …
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A compact model for silicon controlled rectifiers in low voltage CMOS processes
This thesis presents an SCR compact model for simulating ESD protection circuits. The aspects of the compact model that are necessary to reproduce measurement data, such as quasi-static I-V curves and transient voltage overshoot, are discussed. These aspects include conductivity modulation of the …
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Design of class E resonant rectifiers for very high frequency power conversion
Resonant rectifiers have important applications in very-high-frequency power conversion systems, including dc-dc converters, wireless power transfer systems, and energy recovery circuits for radio-frequency systems. In many of these applications, it is desirable for the rectifier to appear as a …
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Modeling, Characterization, and Design of Silicon Controlled Rectifiers for Electrostatic Discharge Protection Circuits
… modeling, and design of silicon controlled rectifiers (SCRs) for electrostatic discharge (ESD) protection applications. The oscillatory transmission line pulse (oTLP) measurement is introduced in this work. oTLP measurements enable indirect observation of a device's charge storage duration. …
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Design of Extreme Efficiency Active Rectifier for More-electric Aircrafts
… carrying out the task is commonly known as "rectifiers". This work aims at designing and constructing rectifiers that can work efficiently and reliably in more-electric aircrafts. One of the major challenge for these rectifiers comes from the complex aircraft environment. The ambient …
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An integrated generator-rectifier system for high-power AC-DC conversion
… conversion architectures rely heavily on active rectifiers, which consist of fully-controlled power-electronics switches. These make the system bulky, lossy, and less reliable. This dissertation presents an alternative approach: integrating a multi-port permanent magnet synchronous generator …
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SYNTHESIS OF PRECURSORS FOR MOLECULAR ELECTRONICS
The design of molecular rectifiers is one of the major topics of research in molecular electronics, however the relationship between the molecular structure and the electrical characteristics of molecular rectifiers is not fully understood. To elucidate this relationship, we synthesized and …
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Modeling and Control of Parallel Three-Phase PWM Converters
… The converters include three-phase boost rectifiers, voltage source inverters, buck rectifiers and current source inverters. The averaging of the parallel converters is performed based on a generic functional switching unit, which is called a phase leg in boost rectifiers and voltage …
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High frequency AC power converter for low voltage circuits
… matching networks and individual full bridge rectifiers, and a 3-phase delta-to-wye matching network and a 3-phase rectifier bridge. In addition, a novel switch-capacitor rectifier capable of 3V, 1W output, was evaluated as an alternative circuit to the diode rectifiers. A 50MHz prototype of …
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Enhanced next generation alternator
… Alternator designs with conventional diode rectifiers and switched-mode rectifiers are investigated. It is found that optimized Lundell alternators are capable of meeting the demands of future systems, and that wound field synchronous machines may also be competitive. It is also found that …
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Wireless, Battery-Free, High-Sensitivity 5G RF Energy Harvesters for Next Generation IoT Sensor Tags
… poses several challenges. High-sensitivity rectifiers are required to capture and convert weak RF signals into usable energy, but integrating these rectifiers with ultra-low power baseband data processing circuits remains a significant hurdle. Moreover, antenna-rectifier matching calibration …
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A modified asymmetrical pulse-width modulated series resonant DC/DC converter
… performance, the use of MOSFETs as synchronous rectifiers in place of diode rectifiers is proposed. Two examples of synchronous rectifier topologies that are applicable to the converter under study are investigated. Computer simulation shows the feasibility of employing synchronous rectification …
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High-Frequency Quasi-Single-Stage (QSS) Isolated AC-DC and DC-AC Power Conversion
… and three-phase QSS bi-directional inverters/rectifiers can be easily derived as topological extensions of the basic QSS bi-directional inverter/rectifier. A new QSS isolated three-phase zero-voltage/zero-current-switching (ZVZCS) buck PWM rectifier for high-power off-line applications is also …
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