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Showing 1 to 20 of 39 for “"EMI filter"”.
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Modeling strategy for EMI filter and flyback transformer
… of the circuit introduces issues in conducted emissions. In a flyback converter, the transformer serves as the path for common mode current flowing from the primary side to the secondary side. Different winding technologies have been invented and implemented to reduce the capacitance between …
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Active filter techniques for reducing EMI filter capacitance
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Integrated Frequency-Selective Conduction Transmission-Line EMI Filter
… attenuator and the DM transmission-line EMI filter. The insertion gain, transfer gain, current distribution, and input impedance of the filter under a nominal design are discussed. In order to apply the transmission-line EMI filter to power electronics systems, the performance of the …
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Switching mode power supply noise source impedance measurement and EMI filter characterization
The effectiveness of an EMI filter is closely related to the impedance of the noise source. Due to the time-varying nature of the noise source impedance of an offline power supply, the measurement of it cannot be done using conventional impedance measuring methods. Two new methods, the insertion …
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High-Density Discrete Passive EMI Filter Design for Dc-Fed Motor Drives
… (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 is used to analyze the grounding scheme of EMI …
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A Compact Three-Phase Multi-stage EMI Filter with Compensated Parasitic-Component Effects
With the advent of wide bandgap (WBG) semiconductor devices, the electromagnetic interference (EMI) emissions are more pronounced due to high slew rates in the form of high dv/dt and high di/dt at higher switching frequencies compared to the traditional silicon technology. To comply with the …
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Investigation of the high-frequency effects in Mn-Zn ferrites for EMI filter applications
… high-power electromagnetic interference (EMI) filters. These applications require cost-optimized, high-performance, and high-power-density magnetic components. As the manufacturers’ material specifications usually do not provide sufficient information to optimize the design, this thesis …
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Non-Intrinsic Differential-Mode Noise in Switching Power Supplies and Its Implications to EMI Filter Design
Electromagnetic Interference (EMI) problems in switching power supplies have been traditionally treated with cut-and-try approaches. In recent years, advancement has been made to better understand the problems and minimize the cut-and-try portion of the design process. However, there are still …
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Integrated EMI Filters for Switch Mode Power Supplies
… electronics converters are potentially large EMI noise sources to nearby equipment. EMI filters are necessary to ensure electromagnetic compatibility. Conventional discrete EMI filters usually consist of a large number of components, with different shapes, sizes and form factors. The …
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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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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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Investigation on Interleaved Boost Converters and Applications
… simultaneously. Using the cutting-edge semiconductor devices, further efficiency improvement at light load is still needed. There are limited approaches available for increasing the power density due to the large EMI filter and inductor size. Interleaved multi-channel boost PFC is a …
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Investigation of High-density Integrated Solution for AC/DC Conversion of a Distributed Power System
… can dramatically reduce PFC inductor size, EMI filter size might be larger at higher switching frequency because of the change of noise spectrum. Since the relationship between EMI filter size and PFC switching frequency is unclear for industry, PFC circuits always operate with switching …
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Towards High Efficiency and High Power Density Converter: System Level Design, Modulation, and Active EMI Filters
… balancing and electromagnetic interference (EMI). Morever, to shrink the EMI filter size for the power converter, an active EMI filter (AEF) structure is proposed. The proposed AEF provides superior performance than any of the conventional passive EMI filter and the existing AEFs. In this …
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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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Characterization and Cancellation of High-Frequency Parasitics for EMI Filters and Noise Separators in Power Electronics Applications
… of high frequency parasitic parameters in EMI filters. One chapter addresses the interaction between the power interconnects and the parasitic parameters in EMI filters. The last chapter addresses the characterization, evaluation and design of noise separators. Both theoretical and …
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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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Separation of the common-mode and the differential-mode conducted electromagnetic interference noise
… to 30 MHz. With the aid of the Noise Separator, EMI filter design is made easier.
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High Power Density and High Temperature Converter Design for Transportation Applications
… better packaging performance and more compact EMI filter design are analyzed and proposed for the goal of high power density converter design in transportation applications.
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Modeling and Mitigation of EMI from Near-Field Coupling Effects in Front-End Power Supplies
… commercialization of wide-bandgap (WBG) power semiconductors. The improved performance of WBG devices over traditional silicon devices has enabled significant increases in switching frequency and power density without compromising power efficiency. However, some challenges remain which …
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