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 35 for “"Common Mode (CM)"”.
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Separation of the common-mode and the differential-mode conducted electromagnetic interference noise
… which can be used to decipher the differential-mode (DM) noise and the common-mode (CM) noise from the total noise. A noise separator hardware is built and tested. The results show that at least 50 dB rejection to either DM or CM noise is achieved for frequency ranging from 10 KHz to 30 MHz. …
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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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A Compact Three-Phase Multi-stage EMI Filter with Compensated Parasitic-Component Effects
… are adopted to attenuate the high frequency common mode (CM) and differential mode (DM) noise through the propagation path. However, self and mutual parasitic components are known to degrade the EMI filter performance. While parasitic cancellation techniques have been discussed at length in …
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Evaluation and Analysis on the Effect of Power Module Architecture on Common Mode Electromagnetic Interference
… experimentally. A time domain LTspice simulation model of the experimental test setup is then built. The common mode (CM) EMI emissions that escape the baseplate of the module into the converter is then examined through the simulation. The simulation is used to explore the CM noise footprint of …
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Current-Transformer Based Gate-Drive Power Supply With Reinforced Isolation
… CI/O is designed less than 2 pF to mitigate the Common-Mode (CM) noise. A circuit topology analysis is performed and the inductor/capacitor/capacitor/inductor (LCCL) – inductor/capacitor (LC) circuit is selected. This circuit allows Zero-Voltage Switching (ZVS) at full operation range. A …
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Passive Cancellation of Common-Mode Electromagnetic Interference in Switching Power Converters
It is well known that common-mode (CM) conducted electromagnetic interference (EMI) is caused by the common-mode current flowing through the parasitic capacitance of transistors, diodes, and transformers to ground in the power circuit. Because of the potential for interference with other systems as …
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In-home PLC to DSL Interference Characterization and Mitigation
… solution, this thesis proposes to use the common mode (CM) signal, which contains information about the electromagnetic interference (EMI), to estimate and subtract the differential mode (DM) PLC-to-DSL interference from the DM DSL signal. Since the PLC-to-DSL interference environment …
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High-Density Discrete Passive EMI Filter Design for Dc-Fed Motor Drives
… various strategies to reduce both differential mode (DM) and common mode (CM) noise using a passive filter in a dc-fed motor drive. Following a standard approach a baseline filter is first designed to be used as reference to understand and compare the available filter topologies. Furthermore, it …
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Non-Intrinsic Differential-Mode Noise in Switching Power Supplies and Its Implications to EMI Filter Design
… to the conventional theory, there are two modes of noise: the Differential-Mode (DM) noise and the Common-Mode (CM) noise. Recently, a new noise-coupling mode called Non-Intrinsic Differential-Mode (NIDM) noise was uncovered accidentally in the process of explaining certain EMI filter …
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Frequency Domain Conductive Electromagnetic Interference Modeling and Prediction with Parasitics Extraction for Inverters
… dissertation is to focus on the development of modeling and simulation methodology to predict conductive electromagnetic interference (EMI) for high power converters. Conventionally, the EMI prediction relies on the Fast Fourier Transformation (FFT) method with the time-domain simulation result …
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Behavioral EMI-Models of Switched Power Converters
… behavioral electromagnetic interference (EMI) models have been shown earlier to accurately capture the EMI behavior of switched power converters. These models are compact, linear, and run in frequency domain, enabling faster and more stable simulations compared to the detailed lumped circuit …
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Design Optimizations of LLC Resonant Converters with Planar Matrix Transformers
… of the planar transformer is investigated and modeled, and design guidelines for filter capacitor selection are provided for optimal efficiency. Next, the existing shielding technique for matrix transformers, which helps reduce common-mode (CM) noise without compromising on efficiency, is …
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Electromagnetic Interference and Compatibility within SiC-based Medium Voltage Converters
… are not guaranteed to work without issues. Modern power converters consist of numerous auxiliary circuits within the converter to achieve sophisticated functionalities such as sensing, communication, fault detection, signal processing, etc. To ensure reliable operation, these auxiliary …
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Insulation Design and Analysis for Medium-Voltage SiC-based Power Electronics Building Blocks
… for use in a 24 kV PEBB-based converter with a common mode (CM) PDIV of 33.2 kV. Subsequently, multiple PEBBs underwent testing to simulate their operation within a 24 kV converter configuration, ensuring dependable performance when assembled. Custom support structures were also designed and …
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Equivalent Modeling of Medium-Voltage Gate Drive Circuitry
… profiles for WBG devices creates challenges for common-mode (CM) conducted emissions behavior that can also negatively affect the gate drive design. This dissertation leverages a decomposition technique to derive equivalent models for the differential-mode (DM) and CM behavior for a medium …
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Improvements in direct torque control of induction motors
… voltages and currents, and a reduction of the Common-Mode (CM) voltage and leakage currents. The switching frequency and the voltage supported by the semiconductor devices are also reduced, and their stress and power losses are therefore lower.<br/>
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Generalized Terminal Modeling of Electro-Magnetic Interference
Terminal models have been used for various power electronic applications. In this work a two- and three-terminal black box model is proposed for electro-magnetic interference (EMI) characterization. The modeling procedure starts with a time-variant system at a particular operating condition, which …
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EMI Terminal Behavioral Modeling of SiC-based Power Converters
… a power converter. As a result, an effective EMI modeling technique of the power converter system is required in order to find an optimized size and effective EMI filter. The frequency-domain model is verified to be an efficient and easy model to explore the EMI noise generation and propagation in …
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A Modelling Framework for Lightning-Induced Common-Mode Currents in Photovoltaic Modules and Small Arrays
… and validate computational electromagnetic (CEM) modelling techniques to replicate cell-to-frame coupling in PV installations and to evaluate the magnitude and significance of lightning-induced common-mode (CM) currents. A range of PV modules, spanning small-scale to full-size units and a complete …
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Analysis and Design of Paralleled Three-Phase Voltage Source Converters with Interleaving
… proposed. Secondly, the control methods for the common mode (CM) circulating current of paralleled three-phase VSCs with discontinuous space-vector modulation (DPWM) and interleaving are proposed. With the control methods, DPWM and interleaving, which is a desirable combination, but not …
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