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Articles 1 - 30 of 33
Full-Text Articles in Engineering
A Memory Saving Vector Fast Multipole Algorithm For Solving The Augmented Efie, Yang G. Liu, Weng Cho Chew, Li (Lijun) Jun Jiang
A Memory Saving Vector Fast Multipole Algorithm For Solving The Augmented Efie, Yang G. Liu, Weng Cho Chew, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
An augmented EFIE (A-EFIE)[9], [10] has been proposed to separate the contributions of the vector potential and the scalar potential for avoiding the imbalance at low frequencies. The corresponding low frequency fast multipole algorithm (LFFMA) [11] was also developed for solving the A-EFIE. Instead of the factorization of the scalar Green's function by using scalar addition theorem in the LF-FMA, we adopt the vector addition theorem for the factorization of the dyadic Green's function to realize memory savings. We are to develop a vector fast multipole algorithm for solving the A-EFIE. © 2010 IEEE.
Augmented Epa With Augmented Efie Method For Packaging Analysis, Zuhui Ma, Lijun Jiang, Wengcho Chew, Maokun Li, Zhiguo Qian
Augmented Epa With Augmented Efie Method For Packaging Analysis, Zuhui Ma, Lijun Jiang, Wengcho Chew, Maokun Li, Zhiguo Qian
Electrical and Computer Engineering Faculty Research & Creative Works
It is evident that the low frequency full wave electromagnetic modelling is necessary for IC packaging analysis. Considering the complexity, it is very difficult to solve the whole problem directly. Even though the domain decomposition method is a legitimate approach for these types of problems, the domain decomposition method based on the equivalence principle has the low frequency breakdown issue. In this paper, we developed a low frequency augmented equivalence principle algorithm (AEPA) with the augmented electric field integral equation (AEFIE) for packaging and IC analysis. On the equivalence surfaces, not only the electric current and the magnetic current, but …
Review Of Multi-Scale Electromagnetic Modeling, W. C. Chew, Lijun Jiang, H. Y. Chao, A. J. Hesford, M. K. Li, Z. G. Qian, Y. G. Liu, Y. P. Chen, Z. H. Ma, L. E. Sun, M. S. Tong, C. Davis, W. E.I. Sha
Review Of Multi-Scale Electromagnetic Modeling, W. C. Chew, Lijun Jiang, H. Y. Chao, A. J. Hesford, M. K. Li, Z. G. Qian, Y. G. Liu, Y. P. Chen, Z. H. Ma, L. E. Sun, M. S. Tong, C. Davis, W. E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reviews various methods to solve multiscale problems ranging from low-frequency methods to very high-frequency methods. ©2010 IEEE.
Decentralized State Feedback And Near Optimal Adaptive Neural Network Control Of Interconnected Nonlinear Discrete-Time Systems, Shahab Mehraeen, Jagannathan Sarangapani, Mariesa Crow
Decentralized State Feedback And Near Optimal Adaptive Neural Network Control Of Interconnected Nonlinear Discrete-Time Systems, Shahab Mehraeen, Jagannathan Sarangapani, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, first a novel decentralized state feedback stabilization controller is introduced for a class of nonlinear interconnected discrete-time systems in affine form with unknown subsystem dynamics, control gain matrix, and interconnection dynamics by employing neural networks (NNs). Subsequently, the optimal control problem of decentralized nonlinear discrete-time system is considered with unknown internal subsystem and interconnection dynamics while assuming that the control gain matrix is known. For the near optimal controller development, the direct neural dynamic programming technique is utilized to solve the Hamilton-Jacobi-Bellman (HJB) equation forward-in-time. The decentralized optimal controller design for each subsystem utilizes the critic-actor structure …
Robust Neural Network Rise Observer Based Fault Diagnostics And Prediction, James W. Fonda, S. (Sarangapani) Jagannathan, Steve Eugene Watkins
Robust Neural Network Rise Observer Based Fault Diagnostics And Prediction, James W. Fonda, S. (Sarangapani) Jagannathan, Steve Eugene Watkins
Electrical and Computer Engineering Faculty Research & Creative Works
A novel fault diagnostics and prediction scheme in continuous time is introduced for a class of nonlinear systems. The proposed method uses a novel neural network (NN) based robust integral sign of the error (RISE) observer, or estimator, allowing for semi-global asymptotic stability in the presence of NN approximation errors, disturbances and unmodeled dynamics. This is in comparison to typical results presented in the literature that show only boundedness in the presence of uncertainties. The output of the observer/estimator is compared with that of the nonlinear system and a residual is used for declaring the presence of a fault when …
Dynamic Response Improvement In A Buck Type Converter Using Capacitor Current Feed-Forward Control, Lisheng Shi, Mehdi Ferdowsi, Mariesa Crow
Dynamic Response Improvement In A Buck Type Converter Using Capacitor Current Feed-Forward Control, Lisheng Shi, Mehdi Ferdowsi, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
The dynamic performance of dc-dc power electronic converters is mainly determined by the output filtering capacitor and inductor, control loop(s) compensator(s), and the voltage conversion ratio. Normally, a larger capacitance and/or a smaller inductance are not recommended because of the extra cost and size of the capacitor and/or the increment of the inductor current ripple. The capacitor current feed-forward method has gained popularity due its fast dynamic response, simpler structure, and less sensing losses. In applications where a large voltage conversion ratio is needed, dynamic response for a load step-down scenario is worse than that of a load step-up condition. …
A Novel Real-Time Approach To Unified Power Flow Controller Validation, Keyou Wang, Mariesa Crow, Bruce M. Mcmillin, Stan Atcitty
A Novel Real-Time Approach To Unified Power Flow Controller Validation, Keyou Wang, Mariesa Crow, Bruce M. Mcmillin, Stan Atcitty
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents the development of a real-time hardware/software laboratory to interface a soft real-time power system simulator with multiple unified power flow controllers (UPFC) via hardware-in-the-loop (HIL) to study their dynamic responses and validate control and placement approaches. This paper describes a unique laboratory facility that enables large-scale, soft real-time power system simulation coupled with the true physical behavior of a UPFC as opposed to the controller response captured by many other real-time simulators. The HIL line includes a synchronous machine, a UPFC, and a programmable load to reproduce the physical dynamics of the UPFC sub-network.
A Thermal Simulation Process Based On Electrical Modeling For Complex Interconnect, Packaging, And 3di Structures, Lijun Jiang, Chuan Xu, Barry J. Rubin, Alan J. Weger, Alina Deutsch, Howard Smith, Alain Caron, Kaustav Banerjee
A Thermal Simulation Process Based On Electrical Modeling For Complex Interconnect, Packaging, And 3di Structures, Lijun Jiang, Chuan Xu, Barry J. Rubin, Alan J. Weger, Alina Deutsch, Howard Smith, Alain Caron, Kaustav Banerjee
Electrical and Computer Engineering Faculty Research & Creative Works
To reduce the product development time and achieve first-pass silicon success, fast and accurate estimation of very-large-scale integration (VLSI) interconnect, packaging and 3DI (3D integrated circuits) thermal profiles has become important. Present commercial thermal analysis tools are incapable of handling very complex structures and have integration difficulties with existing design flows. Many analytical thermal models, which could provide fast estimates, are either too specific or oversimplified. This paper highlights a methodology, which exploits electrical resistance solvers for thermal simulation, to allow acquisition of thermal profiles of complex structures with good accuracy and reasonable computation cost. Moreover, a novel accurate closed-form …
Intelligent Coordinated Control Of A Wind Farm And Distributed Smartparks, Pinaki Mitra, Ganesh K. Venayagamoorthy
Intelligent Coordinated Control Of A Wind Farm And Distributed Smartparks, Pinaki Mitra, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Energy storage is generally recommended in presence of an intermittent source like wind farm for a better control over the power generation from the wind turbine with the variation of the wind speed. In this paper, the potential of plug-in electric vehicle parking lot (SmartPark) as an energy storage in a power system with a large wind farm has been investigated. Also, a fuzzy logic based coordination controller of the wind farm and the distributed SmartParks has been proposed in this paper. The fuzzy controller uses the total state-of-charge of the SmartParks and the difference between instantaneous demand and the …
Pso Tuned Flatness Based Control Of A Magnetic Levitation System, Ganesh K. Venayagamoorthy, E. C. Anene
Pso Tuned Flatness Based Control Of A Magnetic Levitation System, Ganesh K. Venayagamoorthy, E. C. Anene
Electrical and Computer Engineering Faculty Research & Creative Works
Investigation on the application of flatness-based feedback linearization to the magnetic levitation model of INTECOTm Maglev system is presented in this paper. The MAGLEV system dynamics studied consists of a set of third order nonlinear differential equations. Using computational techniques proposed by Levine, it is verified that the ball position is the flat output. The derived flat output is applied in the construction of a nonlinear control law used to control the levitation to a set point as well as tracking a sine function trajectory. The controller gains are obtained and optimized using particle swarm optimization. The simulation results compared …
Nonlinear Control Of Facts Controllers For Damping Interarea Oscillations In Power Systems, Mahyar Zarghami, Jagannathan Sarangapani, Mariesa Crow
Nonlinear Control Of Facts Controllers For Damping Interarea Oscillations In Power Systems, Mahyar Zarghami, Jagannathan Sarangapani, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
This paper introduces a new nonlinear control of flexible ac transmission systems (FACTS) controllers for the purpose of damping interarea oscillations in power systems. FACTS controllers consist of series, shunt, or a combination of series-shunt devices which are interfaced with the bulk power system through injection buses. Controlling the angle of these buses can effectively damp low frequency interarea oscillations in the system. The proposed control method is based on finding an equivalent reduced affine nonlinear system for the network from which the dominant machines are extracted based on dynamic coherency. It is shown that if properly selected, measurements obtained …
Optimized Waveform Relaxation Solution Of Electromagnetic And Circuit Problems, Martin J. Gander, Albert E. Ruehli
Optimized Waveform Relaxation Solution Of Electromagnetic And Circuit Problems, Martin J. Gander, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
New algorithms are needed to solve electromagnetic problems using today's widely available parallel processors. In this paper, we show that applying the optimized waveform relaxation approach to a partial element equivalent circuit will yield a powerful technique for solving electromagnetic problems with the potential for a large number of parallel processor nodes.
Adaptive Quadrant Filter Based Phase Locked Loop System, L. Shi, Mariesa Crow
Adaptive Quadrant Filter Based Phase Locked Loop System, L. Shi, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
Phase-Locked-Loop (PLL) is one of the key technologies extensively used in grid connected power electronics system. A good PLL system can detect the grid phase angle and frequency fast and accurately, and additionally it can extract the positive sequence (or fundamental component for single phase system) exactly. In real applications, source signal (voltage or current) sensed for PLL usually includes harmonic distortion, unbalanced components, noises and frequency variations. Conventional PLL strategy cannot solve all the problems, especially the unbalanced and harmonic distortion. There is a trade-off between the dynamic response and phase angle tracking accuracy. Different PLL solutions are proposed …
Hamiltonian Theory Based Coordinated Nonlinear Control Of Generator Excitation And Statcoms, Keyou Wang, Mariesa Crow
Hamiltonian Theory Based Coordinated Nonlinear Control Of Generator Excitation And Statcoms, Keyou Wang, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
A coordinated controller for generator excitation and STATCOMs is studied based on the Hamiltonian function method. The Hamiltonian realization structure for multimachine power systems including STATCOMs is developed leading to a proposed coordinated scheme of excitation control and STATCOM control. Simulation results illustrate the effectiveness of the proposed control strategy.
Design Of A Conditioner For Smoothing Wind Turbine Output Power, Murali Bottu, Mariesa Crow, A. Curt Elmore
Design Of A Conditioner For Smoothing Wind Turbine Output Power, Murali Bottu, Mariesa Crow, A. Curt Elmore
Electrical and Computer Engineering Faculty Research & Creative Works
As a result of wind speed intermittency, highly variable wind power output can adversely impact local loads. We propose a conditioner to smooth the variable wind power by utilizing the energy of an ultracapacitor. The conditioner is based on a single phase voltage source inverter (VSI) connected between the grid interconnection point and the ultracapacitor. The shunt VSI injects or absorbs active power from the line to smooth the wind power by utilizing the short term storage capabilities of the ultracapacitor. The ultracapacitor is connected to the DC link through a DC-DC converter, which maintains the voltage of the DC …
Solving Multi-Scale Low Frequency Electromagnetic Problems, Zhi Guo Qian, Mao Kun Li, Zu Hui Ma, Li (Lijun) Jun Jiang, Weng Cho Chew
Solving Multi-Scale Low Frequency Electromagnetic Problems, Zhi Guo Qian, Mao Kun Li, Zu Hui Ma, Li (Lijun) Jun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we will discuss two methods to tackle the low-frequency, multi-scale electromagnetics problem. First we will discuss the augmented electric field integral equation (AEFIE), and then, we will discuss the equivalence principle algorithm (EPA). The AEFIE allows the solution of such problems without the need to perform a loop search of a complex structure. The EPA allows the separation of circuit physics from wave physics in a multiscale problem. Hybridization of these two methods will be discussed.
Electrical Modelling Of Temperature Distributions In On-Chip Interconnects, Packaging, And 3d Integration, Lijun Jiang, Chuan Xu, Howard Smith, Barry Rubin, Alina Deutsch, Alain Caron
Electrical Modelling Of Temperature Distributions In On-Chip Interconnects, Packaging, And 3d Integration, Lijun Jiang, Chuan Xu, Howard Smith, Barry Rubin, Alina Deutsch, Alain Caron
Electrical and Computer Engineering Faculty Research & Creative Works
In this talk, we will introduce a novel methodology using existing electromagnetic modelling tools for interconnect and packaging structures to simulate and model the temperature distribution without major modifications to these tools or simulated structures. This methodology can easily be integrated with the chip technology information and frame an electrical circuit simulator into an automatic, template-based simulation and optimization flow. A new accurate closed-form thermal model is further developed to simplify unnecessary object details. The model allows an equivalent medium with effective thermal conductivity (isotropic or anisotropic) to replace details in non-critical regions accurately so that complex interconnect structures can …
The New Centurions, Lynn K. Stichnote, Mariesa Crow
The New Centurions, Lynn K. Stichnote, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
The current group of young people entering the workforce belong to the so-called "millennial generation." Each generation has certain characteristics that have defined its interaction with the world; the millennials have been called the "Net generation." They are the first generation that has never known life without the Internet. As a result of their protected, structured, and positively reinforced upbringing, the millennials are an exceptionally accomplished, positive, upbeat, and optimistic generation. The millennials are the quintessential multitaskers, and they are used to having the world at their fingertips through online search engines. If organizations use the best of the millennials' …
Programmed For Success: Educating Tomorrow's Workforce, Mariesa Crow
Programmed For Success: Educating Tomorrow's Workforce, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
I recently stepped down as chair of the IEEE Power & Energy Society (PES) Power & Energy Education Committee (PEEC) to take my place among a very dedicated group of past chairs and exemplary educators. I have been an active member of the PEEC since the start of my academic career 20 years ago in 1990. The education committee is comprised of educators and practicing engineers who are committed to power engineering career development, university education, and lifelong learning. The committee strives to address issues of whole-life education. This issue of IEEE Power and Energy Magazine has six feature articles …
Reliability Modeling And Analysis Of Clockless Wave Pipeline Core For Embedded Combinational Logic Design, Tao Feng, Noh-Jin Park, Minsu Choi, Nohpill Park
Reliability Modeling And Analysis Of Clockless Wave Pipeline Core For Embedded Combinational Logic Design, Tao Feng, Noh-Jin Park, Minsu Choi, Nohpill Park
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a model for analyzing the reliability of a clockless wave pipeline as an intellectual property (IP) core for embedded design. This design requires different clocking requirements by each embedded IP core during integration. Therefore, either partial or global lack of synchronization of the embedded clocking is considered for the data flow. The clockless wave pipeline represents an alternative to a traditional pipeline scheme; it requires an innovative computing model that is readily suitable for high-throughput computing by heterogeneous IP logic cores embedded in system-on-chip (SoC). A clockless wave pipeline technique relies on local asynchronous operation for seamless …
Microwave And Millimeter Wave Imaging System, R. Zoughi, Mohamed Ahmed Aboukhousa, Mohammad Tayeb Ahmad Ghasr, Sergey Kharkovsky, David Pommerenke
Microwave And Millimeter Wave Imaging System, R. Zoughi, Mohamed Ahmed Aboukhousa, Mohammad Tayeb Ahmad Ghasr, Sergey Kharkovsky, David Pommerenke
Electrical and Computer Engineering Faculty Research & Creative Works
A sensor array having a plurality of modulated slots for microwave and/or millimeter wave imaging. The locations of the slots in the array define a spatial domain away from an object for detecting an electric field from the object. Each of the slots outputs a signal representative of the measured field and the location of the slot. A processor decodes the signals and generates an image of the object.
Standby Leakage Power Reduction Technique For Nanoscale Cmos Vlsi Systems, Heungjun Jeon, Yong-Bin Kim, Minsu Choi
Standby Leakage Power Reduction Technique For Nanoscale Cmos Vlsi Systems, Heungjun Jeon, Yong-Bin Kim, Minsu Choi
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a novel low-power design technique is proposed to minimize the standby leakage power in nanoscale CMOS very large scale integration (VLSI) systems by generating the adaptive optimal reverse body-bias voltage. The adaptive optimal body-bias voltage is generated from the proposed leakage monitoring circuit, which compares the subthreshold current (ISUB) and the band-to-band tunneling (BTBT) current (IBTBT). The proposed circuit was simulated in HSPICE using 32-nm bulk CMOS technology and evaluated using ISCAS85 benchmark circuits at different operating temperatures (ranging from 25°C to 100°C). Analysis of the results shows a maximum of 551 and …
Huygens’ Box Methodology For Signal Integrity Analysis, Lijun Jiang, J. D. Morsey, B. J. Rubin, W. C. Chew, M. K. Li, Y. Liu
Huygens’ Box Methodology For Signal Integrity Analysis, Lijun Jiang, J. D. Morsey, B. J. Rubin, W. C. Chew, M. K. Li, Y. Liu
Electrical and Computer Engineering Faculty Research & Creative Works
A method for performing a signal integrity analysis on an integrated circuit (IC) that includes a plurality of scatterers by dividing the scatterers into subgroups using a nested Huygens' equivalence principal algorithm and solving a set of equations realized thereby with a reduced coupling matrix. The method includes decomposing the IC design into a plurality of small non-overlapping circuit sub-domains, wherein each of the sub-domains is formed as a small, enclosed region. Each sub-domain is analyzed independently of the other sub-domains using only electric fields to represent the interactions of each sub-domains with the other sub-domains as equivalent currents on …
Automatic Detection Of Critical Dermoscopy Features For Malignant Melanoma Diagnosis, William V. Stoecker, Randy Hays Moss, R. Joe Stanley, Xiaohe Chen, Kapil Gupta, Bijaya Shrestha, Pavani Jella
Automatic Detection Of Critical Dermoscopy Features For Malignant Melanoma Diagnosis, William V. Stoecker, Randy Hays Moss, R. Joe Stanley, Xiaohe Chen, Kapil Gupta, Bijaya Shrestha, Pavani Jella
Electrical and Computer Engineering Faculty Research & Creative Works
Improved methods for computer-aided analysis of identifying features of skin lesions from digital images of the lesions are provided. Improved preprocessing of the image that 1) eliminates artifacts that occlude or distort skin lesion features and 2) identifies groups of pixels within the skin lesion that represent features and/or facilitate the quantification of features are provided including improved digital hair removal algorithms. Improved methods for analyzing lesion features are also provided.
Novel And Simple High-Frequency Single-Port Vector Network Analyzer, Mohamed A. Abou-Khousa, Mark A. Baumgartner, Sergey Kharkovsky, R. Zoughi
Novel And Simple High-Frequency Single-Port Vector Network Analyzer, Mohamed A. Abou-Khousa, Mark A. Baumgartner, Sergey Kharkovsky, R. Zoughi
Electrical and Computer Engineering Faculty Research & Creative Works
Portable, accurate, and relatively inexpensive high-frequency vector network analyzers (VNAs) have great utility for a wide range of applications, encompassing microwave circuit characterization, reflectometry, imaging, material characterization, and nondestructive testing to name a few. To meet the rising demand for VNAs possessing the aforementioned attributes, we present a novel and simple VNA design based on a standing-wave probing device and an electronically controllable phase shifter. The phase shifter is inserted between a device under test (DUT) and a standing-wave probing device. The complex reflection coefficient of the DUT is then obtained from multiple standing-wave voltage measurements taken for several different …
Historical Document Enhancement Using Lut Classification, Tayo Obafemi-Ajayi, Gady Agam, Ophir Frieder
Historical Document Enhancement Using Lut Classification, Tayo Obafemi-Ajayi, Gady Agam, Ophir Frieder
Electrical and Computer Engineering Faculty Research & Creative Works
The fast evolution of scanning and computing technologies in recent years has led to the creation of large collections of scanned historical documents. It is almost always the case that these scanned documents suffer from some form of degradation. Large degradations make documents hard to read and substantially deteriorate the performance of automated document processing systems. Enhancement of degraded document images is normally performed assuming global degradation models. When the degradation is large, global degradation models do not perform well. In contrast, we propose to learn local degradation models and use them in enhancing degraded document images. Using a semi-automated …
A Novel Approach To Interarea Oscillation Damping By Unified Power Flow Controllers Utilizing Ultracapacitors, Mahyar Zarghami, Mariesa Crow, Jagannathan Sarangapani, Yilu Liu, Stan Atcitty
A Novel Approach To Interarea Oscillation Damping By Unified Power Flow Controllers Utilizing Ultracapacitors, Mahyar Zarghami, Mariesa Crow, Jagannathan Sarangapani, Yilu Liu, Stan Atcitty
Electrical and Computer Engineering Faculty Research & Creative Works
This paper discusses a novel approach for damping interarea oscillations in a bulk power network using multiple unified power flow controllers (UPFCs) utilizing ultracapacitors, also known more generally as electrochemical capacitors (ECs). In this paper, a new control is introduced to mitigate interarea oscillations by directly controlling the UPFCs' sending and receiving bus voltages that better utilizes the stored energy in the ECs. The results of this controller are compared with and without ECs. The proposed control provides better interarea oscillation mitigation when applied to multiple UPFCs in the 118-bus IEEE test system.
Recurrent Neural Networks Based Impedance Measurement Technique For Power Electronic Systems, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine, Jing Huang
Recurrent Neural Networks Based Impedance Measurement Technique For Power Electronic Systems, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine, Jing Huang
Electrical and Computer Engineering Faculty Research & Creative Works
When designing and building power systems that contain power electronic switching sources and loads, system integrators must consider the frequency-dependent impedance characteristics at an interface to ensure system stability. Stability criteria have been developed in terms of source and load impedance, and it is often necessary to measure system impedance through experiments. Traditional injection-based impedance measurement techniques require multiple online testing that lead to many disadvantages, including prolonged test time, operating point variations, and impedance values at limited frequency points. The impedance identification method proposed in this paper greatly reduces online testing time by modeling the system with recurrent neural …
Causal Rlgc( Ƒ ) Models For Transmission Lines From Measured S-Parameters, Jianmin Zhang, James L. Drewniak, David Pommerenke, Marina Koledintseva, Richard E. Dubroff, Wheling Cheng, Zhiping Yang, Qinghua B. Chen, Antonio Orlandi
Causal Rlgc( Ƒ ) Models For Transmission Lines From Measured S-Parameters, Jianmin Zhang, James L. Drewniak, David Pommerenke, Marina Koledintseva, Richard E. Dubroff, Wheling Cheng, Zhiping Yang, Qinghua B. Chen, Antonio Orlandi
Electrical and Computer Engineering Faculty Research & Creative Works
Frequency-dependent causal RLGC(f) models are proposed for single-ended and coupled transmission lines. Dielectric loss, dielectric dispersion, and skin-effect loss are taken into account. The dielectric substrate is described by the two-term Debye frequency dependence, and the transmission line conductors are of finite conductivity. In this paper, three frequency-dependent RLGC models are studied. One is the known frequency-dependent analytical RLGC model ( RLGC-I), the second is the RLGC(f) model (RLGC-II) proposed in this paper, and the third (RLGC-III) is same as the RLGC -II, but with causality enforced by the Hilbert transform in frequency domain. The causalities of the three RLGC …
Reducing Common-Mode Voltage In Three-Phase Sine-Triangle Pwm With Interleaved Carriers, Jonathan W. Kimball, Maciej Jan Zawodniok
Reducing Common-Mode Voltage In Three-Phase Sine-Triangle Pwm With Interleaved Carriers, Jonathan W. Kimball, Maciej Jan Zawodniok
Electrical and Computer Engineering Faculty Research & Creative Works
Interleaving PWM waveforms is a proven method to reduce ripple in dc-dc converters. The present work explores interleaving for three-phase motor drives. Fourier analysis shows that interleaving the carriers in conventional uniform PWM significantly reduces the common-mode voltage. New DSP hardware supports interleaving directly with changes to just two registers at setup time, so no additional computation time is needed during operation. The common-mode voltage reduction ranges from 36% at full modulation to 67% when idling with zero modulation. Third harmonic injection slightly reduces the advantage (to 26% at full modulation). However, the maximum RMS common-mode voltage is still less …