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 27 for “"EMI noise"”.
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Conducted EMI Noise Prediction and Filter Design Optimization
… is the stringent electromagnetic interference (EMI) regulation worldwide. For the CRM PFC converter, there are several challenges on meeting the EMI standards. First, for the CRM PFC converter, the switching frequency is variable during the half line cycle and has very wide range dependent on …
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EMI Noise Reduction Techniques for High Frequency Power Converters
… in switch mode power supplies will cause severe EMI noise issue. In a typical front-end converter, the EMI filter usually occupies 1/3 to 1/4 volume of total converter. Hence, reducing the EMI noise of power converter can help reduce the volume of EMI filter and improving the total power density …
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DM EMI Noise Analysis for Single Channel and Interleaved Boost PFC in Critical Conduction Mode
… current ripple in CRM PFC creates huge DM EMI noise, which requires a big EMI filter. The switching frequency of the CRM PFC is variable in half line cycle which makes the EMI characteristics of the CRM PFC are not clear and have not been carefully investigated. The worst case of the EMI …
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Modular Approach for Characterizing and Modeling Conducted EMI Emissions in Power Converters
… power electronics, electromagnetic interference (EMI) and electromagnetic compatibility (EMC) issues have become more and more important for both power converter designers and customers. This dissertation studies EMI noise emission characterization and modeling in power converters. A …
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Modeling and Characterization of a PFC Converter in the Medium and High Frequency Ranges for Predicting the Conducted EMI
… the conducted electro-magnetic interference (EMI) prediction results for a continuous conduction mode (CCM) power factor correction (PFC) converter as well as the theoretical analysis for the noise generation and propagation mechanisms. In this thesis, multiple modeling and characterization …
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SiC-Based High-Frequency Soft-Switching Three-Phase Rectifiers/Inverters
… power density are limited by silicon (Si) power semiconductor devices, which make the systems operate at only up to around 30 kHz. The emerging wide bandgap (WBG) power semiconductor devices are considered as game changing devices to exceed the limits brought by their Si counterparts. Much higher …
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Switching Trajectory Control for High Voltage Silicon Carbide Power Devices with Novel Active Gate Drivers
<p>The penetration of silicon carbide (SiC) semiconductor devices is increasing in the power industry due to their lower parasitics, higher blocking voltage, and higher thermal conductivity over their silicon (Si) counterparts. Applications of high voltage SiC power devices, generally 10 kV or …
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EMI Terminal Behavioral Modeling of SiC-based Power Converters
… However, electro-magnetic interference (EMI) becomes a more severe problem as a result. In this thesis, the switching frequency effect on conducted EMI noise is assessed. As EMI noise increases, the EMI filter plays a more important role in a power converter. As a result, an effective EMI …
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Transformer Shielding Technique for Common Mode Noise Reduction in Switch Mode Power Supplies
… in switch mode power supplies will cause severe EMI noise issue. In a typical front-end converter, the EMI filter usually occupies 1/3 to 1/4 volume of total converter. Hence, reducing the EMI noise of power converter can help reduce the volume of EMI filter and improving the total power density …
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Analysis and Evaluation of Soft-switching Inverter Techniques in Electric Vehicle Applications
… reductions, the electromagnetic interference (EMI) noise, the total harmonic distortion (THD) and the control complexity. An analysis of the harmonic distortion caused by short pulses is presented and a space vector modulation scheme is proposed to alleviate the effect. To effectively analyze …
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Integrated EMI/Thermal Design for Switching Power Supplies
This work presents the modeling and analysis of EMI and thermal performance for switch power supply by using the CAD tools. The methodology and design guidelines are developed. By using a boost PFC circuit as an example, an equivalent circuit model is built for EMI noise prediction and analysis. …
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Signal Integrity Analysis and Electromagnetic Inteference Modeling for Autonomous Vehicles
… requirements. The electromagnetic interference (EMI) noise may become a major concern with the ever-increasing number of electric modules. This research focuses on both SI analysis and EMI modeling for AVs. The first topic is accurate and broadband three-phase motor modeling. The novel modeling …
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Design and Optimization of Multichip GaN Module Enabling Improved Switching Performance
<p>Wide bandgap semiconductors (SiC & GaN) due to their enhanced performance and superior material properties compared to traditional silicon power devices have become the ultimate choice for future high-performance power electronics energy conversion. GaN high electron mobility transistor (HEMT) …
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Passive Component Weight Reduction for Three Phase Power Converters
… using power electronic devices also introduces EMI issues to the system, which means filters are inevitable in those systems, and they make up a significant portion of the total system size and cost. Thus, designing for high power density for both power converters and passive components, …
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Improved Forward Topologies for DC-DC applications with Built-in Input Filter
… Furthermore, without an external LC filter, the EMI noise levels can be further reduced as a result of the embedded notch filter formed by the transformer leakage inductance and clamp capacitor if the notch frequency is designed to be the same as the switching frequency. With the help of the …
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The Testing and Verification of a Nanomembrane Based Pressure Sensor for Small-Scale Underwater Pressure Measurements
… resampling techniques to eliminate background noises. First, the sensors were calibrated to ensure their linearity and to determine their pressure sensitivities. Then, using bench-top testing rigs and a water tunnel, the sensor performance was evaluated in submerged environments when subjected …
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Investigation of Topology and Integration for Multi-Element Resonant Converters
… protection, synchronous rectifier drive, EMI noise and integration, etc. To solve those issues, like start-up and short-circuit protection, SR driving and EMI, etc., a synthesis method is proposed to find the similar resonant topologies like LLC. Based on this method, lots of multi-element …
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High Temperature High Bandwidth Fiber Optic Pressure Sensors
… agents or electromagnetic interference (EMI) noise that may be present in those environments. Fiber optic pressure sensors have been developed for years and proved themselves successfully in such harsh environments. Especially, diaphragm based fiber optic pressure sensors have been shown …
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Power Density Optimization of SiC-based DC/AC Converter for High-Speed Electric Machine in More/All-electric Aircraft
… while adhering to the stringent aerospace EMI standard DO-160 and bearing current limitations. Electric aircraft demand unmatched reliability, necessitating strict control over EMI noise and bearing currents. These considerations significantly impact the selection of topology and parameters …
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Analysis of Inductor-Coupled Zero-Voltage-Transition Converters
… losses and electromagnetic interference (EMI) noise. Since the soft-switching topologies reduce the switching losses of the converter main switches, the topologies make converters partially independent from the switching frequency. However, the conventional soft-switching topologies have …
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