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 16 of 16 for “"Common mode noise"”.
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Transformer Shielding Technique for Common Mode Noise Reduction in Switch Mode Power Supplies
Switch mode power supplies are widely used in different applications. High efficiency and high power density are two driving forces for power supply systems. However, high dv/dt and di/dt in switch mode power supplies will cause severe EMI noise issue. In a typical front-end converter, the EMI …
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Study on Zero Crossing Detection in CRM Totem-pole PFC Converter
… power factor correction. Critical conduction mode (CRM) or triangular current mode (TCM) operation of totem-pole PFCs has become popular for achieving zero-voltage switching (ZVS). This enables pushing the converter's switching frequency into the megahertz range to achieve high power density …
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Optimising Signal Isolation and Phase Measurement in Digitally Enhanced Interferometry
… interferometry through the use of pseudo-random noise codes. It allows time-of-flight multiplexed precision sensing with interferometric sensitivity by using these codes to identify the signal of interest, while rejecting spurious noise sources and undesired signal channels. This thesis aims to …
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Optimising Signal Isolation and Phase Measurement in Digitally Enhanced Interferometry
… interferometry through the use of pseudo-random noise codes. It allows time-of-flight multiplexed precision sensing with interferometric sensitivity by using these codes to identify the signal of interest, while rejecting spurious noise sources and undesired signal channels. This thesis aims to …
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Design of a Resonant Snubber Inverter for Photovoltaic Inverter Systems
… size, high cost, and generation of electrical noise, especially common mode noise. Efforts to solve these issues have resulted in improved solutions, but they do not eliminate all of the problems and even exaggerate some of them. Soft switching inverters are able to achieve high efficiency by …
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High Frequency Bi-directional DC/DC Converter with Integrated Magnetics for Battery Charger Application
… totem-pole AC/DC in critical conduction mode (CRM) to realize zero voltage switching (ZVS), is operated at over 300 kHz. A bi-directional CLLC resonant converter operating at 500 kHz is chosen for the second stage. Instead of using the conventional fixed 400 V DC-link voltage, a variable …
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A Study of coherent noise in binary Read-Out Systems and its applications to the ATLAS SemiConductor Tracker end-Cap
… mainly depends on two parameters, which are noise occupancy and detection efficiency. Both of these parameters deteriorate with increasing noise in the system. It is therefore important to understand the effects of noise and to develop efficient methods to minimize it. <br>Silicon detectors …
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Increasing Signal to Noise Ratio and Minimising Artefacts in Biomedical Instrumentation Systems
… the 40kHz powerline interference (PLI), 50/60kHz common-mode noise, white noise, and motion artefacts. The system was fully developed and tested and was firstly simulated using MATLAB Simulink tools to prove the effectiveness of the system before starting the implementation and build phase in the …
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Fabrication and Testing of A Middle-Ear Implanted Microphone
… fluoride (PVDF). The bimorph design reduces common mode noise as compared to our previous microphone designs. Extensive bench testing and experiments in fresh human cadavers demonstrates excellent microphone performance despite the use of biocompatible materials. The UmboMic sensor is well …
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Modeling, Analysis, and Design of Distributed Power Electronics System Based on Building Block Concept
… concept, the discrete and large signal average models are developed for simulation, design, and analysis of large-scale PEBB-based systems. New average models are developed for half-bridge PEBB module and Space Vector Modulation (SVM). These models keep the exact information of the discontinuous …
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Direct Back EMF Detection Method for Sensorless Brushless DC (BLDC) Motor Drives
… EMF voltage is referenced to ground without any common mode noise. Therefore, this back EMF sensing method is immune to switching noise and common mode voltage. As a result, there are no attenuation and filtering necessary for the back EMFs sensing. This unique back EMF sensing method has …
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Modeling and Control of Parallel Three-Phase PWM Converters
This dissertation studies modeling and control issues of parallel three-phase pulse-width modulated (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 …
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Near infrared tunable diode laser spectroscopy for aero engine related applications
… autobalanced photoreceivers, typically used for common mode noise cancellation, for direct absorption measurements and in a different configuration for nulling of the residual amplitude modulation (RAM) in wavelength modulation spectroscopy. Initial measurements suggest that removal of the …
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High Frequency GaN Characterization and Design Considerations
… to push power density to meet the requirement of modern systems. Silicon has been a dominant material in power management since the late 1950s. However, due to continuous device optimizations and improvements in the production process, the material properties of silicon have increasingly become …
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Comparison and Design of High Efficiency Microinverters for Photovoltaic Applications
… systems. Operation capabilities such as common mode noise and efficiency are compared. The main focus of the review is to determine the optimal DC-AC inverter using the performance metrics of cost, efficiency and common mode performance. A 250 W prototype is built for each inverter …
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Circuits and Modulation Schemes to Achieve High Power-Density in SiC Grid-connected Converters
… coupled inductors into two; one for differential-mode circulating current and the other for common-mode circulating current. By comparing with prior research work, a 20% reduction in size and weight is demonstrated. From Chapter 3 to Chapter 5, a full-SiC uninterruptible power supply (UPS) was …