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Showing 1 to 20 of 139 for “"common mode"”.
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Common Mode Effect of the ALICE Transition Radiation Detector - Baseline Shift
… multi-wire proportional chamber, it creates a common-mode effect, this common-mode effect manifests itself as a drop in the signal produced by the surrounding readout electronics where no particle has traversed, called the baseline. Capacitors have been installed in a layout to produce a …
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Wide common mode input operational amplifier with serially programmable output offset
… amplifiers continue to develop to meet modern demands on performance. This document describes an operational amplifier designed for a highly specific telecommunications application - to serve as the buffer between an I/Q demodulator and Gm-C filter. Requirements set forth by this …
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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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Exploring the properties of a combined differential-mode equalizer and common-mode filter
… This thesis analyzes a combination differential-mode equalizer and common-mode filter (DME-CMF) realized on a two-layer microstrip board. Measurements up to 25 GHz are taken to explore the functionality of this device at and above the design frequency. The basics of S-parameters are reviewed, and …
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The design of a high precision, wide common mode range auto-zero comparator
… discusses the design and analysis of a high common-mode input auto-zero comparator for use in a Hot Swap controller. Comparators are essential building blocks within the current limit detection schemes of Hot Swap controllers. However, the current limit detection scheme places a sense …
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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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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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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 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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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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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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Common Mode Failure Analysis of Test and Maintenance Procedures at LaSalle Unit #2 Boiling Water Reactor Plant 5/Mark II
Made available in DSpace on 2017-07-06T18:55:01Z (GMT). No. of bitstreams: 3 Lambright_John_A_MS.pdf: 89517257 bytes, checksum: c1942e50307929ab5ca2d521bf4d872a (MD5) Lambright_John_A_MS_ABS.pdf: 422087 bytes, checksum: f5dc75044a2cb7e320189bb1451f0c4f (MD5) license.txt: 4813 bytes, checksum: …
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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
… avoid self-pollution and polluting the grid. The common-mode voltage (CMV) is one important factor of EMI emissions. Thus, reducing or eliminating it could improve the cost and size of the system. Space vector pulsewidth modulation (SVWPM) can directly design the CMV output and the switching …
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Design and Validation of a High-Density 10 kV Silicon Carbide MOSFET Power Module with Reduced Electric Field Strength and Integrated Common-Mode Screen
… ringing and voltage overshoot. An integrated common-mode current screen contains the current that is generated by these fast voltage transients within the power module, rather than flowing to the system ground. This screen connection simultaneously increases the partial discharge inception …
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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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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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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 …
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Modeling strategies for estimating and suppressing electromagnetic interference and improving power integrity
… board. Here, simple and accurate inductance models of 2- and 8-terminal capacitors including connections to the power and return plane are developed. Circuit models of the capacitors and layout are created using the partial equivalent element circuit method which provide options for …
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Design of a High Dynamic Range CMOS Variable Gain Amplifier for Wireless Sensor Networks
… be controlled. In order to stabilize the output common mode voltage of each VGA cell under the variation of its bias currents, a common mode feedback circuit is introduced in the VGA. The VGA was fabricated in IBM's CMRF8SF 130 nm CMOS process.</p>
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