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 18 of 18 for “"Common-Mode Voltage"”.
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COMMON MODE VOLTAGE ELIMINATION IN THREE-PHASE FOUR-LEG INVERTERS UTILIZING PULSE DENSITY MODULATION
Common mode (CM) electromagnetic interference (EMI) is a phenomenon that negatively affects power electronics to include voltage source inverters. Typically, CM EMI reduction is achieved through passive measures such as CM chokes and passive filters. This thesis research explores removing the need …
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Modeling and Design of a SiC Zero Common-Mode Voltage Three-Level DC/DC Converter
… additional features. This converter topology was modeled, simulated, and a hardware prototype constructed for evaluation within a UPS system, although its uses are not limited to such applications. A UPS system is a good example of an application with strict noise requirements which must be …
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A Pseudo-Binary Cascaded H-bridge Converter for Solid-State Transformer Applications and Modulation Techniques for the Minimization of the Common-Mode Voltage
… converters supply or consume power from the low-voltage utility, which impacts the size and efficiency of the system. For example, the recent proliferation of electric vehicles has demanded the rapid installation of dc fast chargers (DCFC) across the country. However, most of the commercial DCFCs …
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High voltage sampling scheme independent of capacitor voltage coefficient for a delta sigma modulator
… a delta sigma modulator that is independent of common mode voltage. The rejection of common mode voltage is important in the application of electric vehicles and other large battery packs in order to accurately measure every cell on the stack with varying common mode voltages. A switched …
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Design of a Hybrid Unipolar Modulation Dual-Buck Inverter using Wide Bandgap Devices
Common mode performance is important for photovoltaic applications where the common mode voltage can become hazardous to people near the solar installation and can cause reliability concerns in inverters. The proposed dual-buck inverter uses hybrid unipolar modulation and a topology that is …
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Space vector pulse-width modulation for multilevel inverters and solution to modulation dependent problems
… Furthermore, in linear range, maximum obtainable voltage is 90.7% of six-step. It can be increased further by properly utilizing the DC-link capacity through overmodulation. However, the implementation of SVPWM in overmodulation range is even more complex due to the nonlinearities of this region. …
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Design of a High Dynamic Range CMOS Variable Gain Amplifier for Wireless Sensor Networks
… wide gain variation, small chip area, low supply voltage, and controllable dynamic gain range. The gain variation of the 3-stage VGA is implemented by a voltage to current converter. It controls the bias currents of each VGA cell, so that the output gain of each cell can be controlled. In order to …
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Low Voltage Ride-Through for Indirect Matrix Converter Based Open-End Winding Drives
… recently many electric vehicles (EV). The most commonly employed types are the DC-to-AC or AC-to-AC drives with DC/AC drives being more popular in storage and EV applications. AC/AC drives have been dominated by converters using large capacitors with DC bus viz. back-to-back converters. These …
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Transformer-Less Common Gro Nine-Level Grid-Connected Boost Inverter for PV Panels
… is done. The confinement of leakage current and common mode voltage in non-isolated structures connected to the grid is studied. In the second chapter, the one-cycle control is reviewed in detail. The basics of the control algorithm, as well as the resources review, are presented. The third …
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Circuits and Modulation Schemes to Achieve High Power-Density in SiC Grid-connected Converters
… such as low-loss characteristics, high blocking voltage, and high junction temperature operation, they are expected to drastically increase the power density of power electronics systems. Recent state-of-the-art designs show the power density over 17 ; however, certain factors limit the power …
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Towards High Efficiency and High Power Density Converter: System Level Design, Modulation, and Active EMI Filters
… hybrid-switch-based TNPC inverters with loss and common-mode voltage reduction. Finally, the design, modelling, and testing of the proposed AEF is demonstrated.</p>
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High performance amplifier topologies implemented with a micro-machined vibrating capacitor
… low-leakage inputs and a very wide input common mode voltage range. The up-modulation provides a means for achieving a low input referred offset voltage and low-noise via the use of correlated double sampling or chopper stabilization. At the system level, this amplifier consists of two …
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Bridge to digital converters for environmental monitoring in edge IoT devices
… signal that needs to be detected in a higher common-mode voltage. This presents particular challenges for ADCs digitising WhB outputs, commonly referred to as Bridge-to-Digital Converters (BDCs), which need to have high input impedance and gain, be linear, and have offset and noise levels …
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Direct Back EMF Detection Method for Sensorless Brushless DC (BLDC) Motor Drives
… back EMF sensing based on motor neutral voltage for BLDC has certain drawbacks, which limit its applications. In this thesis, a novel back EMF sensing scheme, direct back EMF detection, for sensorless BLDC drives is presented. For this scheme, the motor neutral voltage is not needed to …
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High-Frequency Design Consideration and EMI Mitigation in SiC-based Multilevel Converters
Medium Voltage (MV) power conversion systems are essential in high power applications to address the increasing demand of energy and the increasing penetration of renewable energy sources. MV power electronics converters are the key elements for power conversion in MV systems and are the focus of …
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The impact of conventional and wide bandgap semiconductor PWM inverter EDM bearing currents on motor bearings.
… dissertation presents detailed discharge circuit modeling of motor bearing currents, investigates the impact of discharge energy on the damage produced on the bearing race and ball surfaces through the use of a finite element (FE) model, presents a novel technique to statistically characterize EDM …
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Zero Voltage Switching (ZVS) Turn-on Triangular Current Mode (TCM) Control for AC/DC and DC/AC Converters
… to the converter to achieve soft switching is a common method. However, it increases the physical complexity of the system. Hence, advanced control methods are adopted for today's power converters that enable soft switching for devices specifically ZVS turn-on as the turn-off losses of next …
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Modeling and Control of Modular Multilevel Converter
… (MMCs) are deemed the most suitable for high-voltage and medium-voltage power conversion applications. However, large module capacitors are usually required in MMCs to store large circulating power of line-frequency and its harmonics that flow through the capacitors. Even though several …