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Advanced Topics in Electrical Engineering (ATEE), 2013 8th International Symposium on

Date 23-25 May 2013

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Displaying Results 1 - 25 of 198
  • A 14-bit and 70-dB dynamic range, continuous time, sigma delta modulator

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (471 KB) |  | HTML iconHTML  

    This paper presents a new circuit realization for multi bit continuous time sigma delta modulator. The converter has been designed in a 0.18 um TSMC technology and achieves a maximum signal-to-noise ratio (SNR) of 70 dB in a 1 MHz bandwidth and dissipates 5mW from a 1.8 V supply when clocked at 100MHz. The convertor has a third-order active-RC loop filter, a 4-bit flash quantizer and errors are corrected by Data Weighted Averaging (DWA). The DWA technique is used for reducing DAC noise due to component mismatches. A multi-bit non-return-to-zero (NRZ) DACs is adopted to reduce clock jitter sensitivity. The performance of the circuits was demonstrated using HSPICE at low voltage operation of 1.8V. View full abstract»

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  • Designing and testing a field programmable gate array based trigger system

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (398 KB) |  | HTML iconHTML  

    This paper addresses the problem of recording those fast voltage variations with features that do not meet the conditions required by conventional trigger systems. It is about transients, with amplitudes below the minimum trigger level that is usually set higher than the maximum amplitude of the rated voltage. For this purpose, it is used a Butterworth numeric type filter, implemented on an field programmable gate array (FPGA) processor in order to obtain a trigger command at a slope variation of the traced signal. View full abstract»

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  • A comparative study of some time delay estimation methods based on second-order statistics

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    In this paper the problem of estimating the difference in arrival times of non-Gaussian signals at two spatially separated sensors is considered. It is assumed that the signals were corrupted by uncorrelated white Gaussian noises or by colored Gaussian noises. Some synthetic signals were generated and a real voice signal was recorded in an acoustic anechoic chamber. Based on these signals some methods for time delay estimation were tested. View full abstract»

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  • Fundamental frequency estimation based on mean values

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (428 KB) |  | HTML iconHTML  

    Frequency estimation is an important subject of research in different research areas, such as wireless communication, acoustic and speech processing, sonar and radar measurements. Currently there are available methods that use time domain and frequency domain analysis to detect the frequency of a signal. Within this paper a new time domain method is presented, which analyses the mean values of data segments of the investigated signal. The algorithm doesn't require complex operations and gives good results with only two periods of the investigated signal. View full abstract»

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  • Theoretical and experimental evaluation on a counterintuitive diamagnetically stabilized levitation setup with permanent magnets

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (403 KB) |  | HTML iconHTML  

    We report a novel counterintuitive vertical levitation structure involving permanent magnets and at least one stabilizing diamagnetic piece. The setup consists of two permanent NdFeB magnets in a vertical inline configuration. A strong lifter magnet attracts a smaller magnet and compensates its weight. Stability at the equilibrium point is ensured by a diamagnetic pyrolytic graphite plate placed either above or below the levitated magnet. Compared to the classical vertical diamagnetic levitation cases, the magnetic moments of the magnets are antiparallel. Accepted tolerances during the magnetizing process lead to a visible anomaly of the levitated magnet equilibrium point position that apparently defies symmetry. First experiments and calculation results are presented. The proposed setup could find application as a highly sensitive tilt meter or in sensing magnetization angle errors. View full abstract»

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  • Computer aided design of the electric power source of a water treatment station

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB) |  | HTML iconHTML  

    This paper presents the design (based on ABB-DOC software) of the electric power supply of a water treatment station. The electric power supply depends on the sizing of the protection and commutation elements located in the general distribution panel and also on the main panels that feed the receptors of the water treatment station. The receptors powered from the main panels are the following: water pumping group, air blower, stirrer of decanters basin, agitators of metering pumps, electric valves and command panels. The general distribution panel feeds the main panels, outlet circuits, lighting circuits and the hot air blower. To insure the safety of the electric power supplies' functioning, a well dimensioned grounding and the atmospheric overload protection system is installed. From the results obtained based on the installation's design, the needs of the protection and distribution equipment and also the cable list were determined. By viewing the current versus time curve, the protection's selectivity for each distribution panel can be observed. This paper presents the advantages and disadvantages of ABB-DOC's program in the design of electric schemes. View full abstract»

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  • Signal integrity issues due to ESD events in high-speed CMOS comparator

    Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (335 KB) |  | HTML iconHTML  

    This paper is mainly focused on analyzing the behavior of the output data of a CMOS latched comparator subjected to the Human Body Model (HBM) Electrostatic Discharge (ESD) test event. The importance of the comparator circuit in the applications of data transmission is illustrated. Several tests using the Cadence IC 5.3 software were carried out in order to investigate the accuracy of the output data signal. The tests were computed for the high and low level of the clock. The malfunction of the comparator structure due to the effects of the electrostatic field is investigated. The functioning of the circuit was improved by adding decoupling capacitors with protective properties. View full abstract»

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  • Telesurveillance primary data acquisition module

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (558 KB) |  | HTML iconHTML  

    During the past, nuclear power plants personnel has established a list of parameters that need permanent monitoring due to the fact that they directly influence the decisional process in avoiding alarming states or reducing the outcome of potential incidents. All this have lead to the need for an integrated monitoring, processing and alarming system. A potential beneficiary would have great interest in the good functioning parameters specific for the rotating units and the housing compounds by using mechanical vibrations measurements. The presented paper details the part responsible for data collecting in such a system. View full abstract»

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  • Packet routing and information distribution in Multiprotocol Label Switching

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (275 KB) |  | HTML iconHTML  

    MPLS (Multiprotocol Label Switching) is one of the possible methods used to create a data circuit switching behavior even if the underlying telecommunication network is a routed/switched packet network. If inside the network there is a path hierarchy, the common approach is to transmit the entire label stack, using one label for each path in the hierarchy. For optimization, a single LSP (Label-Switched Path) label could be transmitted without others labels but together with a list of component identifiers. Using these identifiers inside each network node, the full LSP labels can determined. This paper proposes a mechanism to populate the interconnected nodes of a network with the meaningful information necessary to obtain the path label from a database. View full abstract»

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  • Towards autonomic management of software enabled networks

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (538 KB) |  | HTML iconHTML  

    In this position paper, we present a new networking and management framework - called SeNET - that integrates software driven features with the management features of modern autonomic network management, and many service features from the world of services. This framework is under development and validation. View full abstract»

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  • Characteristics of Value Analysis Method in electrical engineering

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB) |  | HTML iconHTML  

    The Value Analysis Method provides two ways of improving a product or service: reducing the production cost and improving the performance of the product/service by identifying potential development directions. In the present paper the authors describe the characteristics of the functional analysis phase in the Value Analysis methodology for the electrical engineering products area. Also, they propose a new method for determining the importance level of a product's functions. The functions are divided into categories corresponding to the type of energy transfer between the product and the environment. This requires a double ranking method: firstly rating the categories and secondly rating the functions within each category. The method is recommended complex products with multiple functions. In order to validate the proposed method, the authors carried out a research in Romania, on a sample of 88 respondents from the academic and industrial (electrical engineering) field. View full abstract»

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  • Teaching integrated circuits design using LASI

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1990 KB) |  | HTML iconHTML  

    This paper presents the efforts to introduce integrated circuit (IC) design to Electronics engineering undergraduate students, using the LASI program. The professional Computer-aided Design (CAD) systems for IC design are expensive in terms of hardware, CAD tools and CAD licenses. The next problem connected to their use for educational purposes is the need of training on both the CAD software and the UNIX system. The Windows LASI system is a freeware CAD environment for a full-custom Very Large Scale Integration (VLSI) microelectronic circuits design, intended for educational purposes. The LASI tool is employed for teaching IC design in Electronics engineering undergraduate program at the Department of Electronics, Ruse University, Bulgaria. The paper provides description of the Microelectronics courses, LASI system, technology, and an example design. View full abstract»

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  • Life in 2030-brief presentation from the IEEE reviews

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (329 KB) |  | HTML iconHTML  

    The electrical energy domain is very dynamic. The paper presents a vision for the future at the horizon of 2030 as it is described by an IEEE recent publication. A new wave of electrification is at horizon; the entire new infrastructure in a modern society is electrical one. Electrical engineers must innovate, research, project, realize and develop new home (smart home), new electrical networks (smart grid), new sources (renewable) new system of powering electric cars (car plug-in) modern electric vehicles (electric and hybrid cars, trucks and buses, metro and tramway) high speed train, modern airplanes, all other electro-technological equipments and many others power electrical applications. At the basis of many new products are new and revolutionary materials as, for example, nano-structured, cryogenic and others. The real challenge: Smart solutions for better life! View full abstract»

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  • Basics of design and testing of a digital content generator tool for e-learning

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB) |  | HTML iconHTML  

    E-learning opens a new way in education based on various communication tools and plays a distinguish role in creating and promoting computer based learning communities and actively encourage their development. E-learning has performed huge steps and has drawn new bounds in the educational system everywhere, a good reason to establish an efficient way to develop and test specific content for it. The purpose of this paper is to present a conceptual design for digital content generator tool that is aimed to facilitate the creation, publication and the update and edit of digital educational content with adaptive features. This digital content tool is designed to facilitate the access, both of teachers and learners, to eLearning solutions. View full abstract»

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  • Sensing and actuation: A new paradigm in teaching

    Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (257 KB) |  | HTML iconHTML  

    Sensors and actuators are the basis of almost all electrical systems, especially if one views them as generalized inputs and outputs. But the approach to teaching them has been ad-hoc, based almost entirely on an encyclopedic enumeration of their properties and applications. This approach is also evident in textbooks available. They are either specialized research monographs on a class of devices or are handbooks that describe many devices, sometimes exhaustively. A rational approach to teaching should be based on principles rather than on descriptions of functioning of the devices and should cover all or at least the main principles of sensing and actuation. But therein lies the problem. Sensors and actuators are based on numerous physical principles that cover all disciplines. To understand their operation and eventually to design sensors and sensor systems requires a broad knowledge in almost all areas of science and engineering. This requires a broadening of the base of instruction to include material science, physics, chemistry and related subjects such as optics, nuclear engineering, fabrication, packaging and others. Instead of specialization, the study of sensors and actuators favors diversification and by so doing it stands in contrast with most other topics in the engineering curriculum. View full abstract»

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  • Remote control of the railway contact line disconnectors

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (511 KB) |  | HTML iconHTML  

    This paper presents various possibilities of remote control of the electrical disconnectors located on the railway's contact line. The disconnectors's can be controlled remotely by maneuvers made by the railway station dispatcher, when demanded by and with the approval of the railway power dispatcher. Disconnectors are electrically maneuvered by means of an actuator which can be controlled locally (directly from the device's control panel or from the local railway station) and by remote control (from the railway power dispatch). The disconnectors's remote control system is located in the office of the railway station dispatcher and it is composed of a local control panel, conductive elements and an interface relay panel. The local control panel has buttons that send remote control signals and lights that signal the command sent. The conductive elements are connectors between the local control panel and disconnector's motor operating devices. The interface of the relay panel is necessary to obtain the disconnectors's remote control. The implementation of programmable logic controllers, used in both in the command and the disconnectors's status signal was possible by taking information from the interface relays. The traffic information received from railway stations and its integration in supervisory control and data acquisition distribution systems leads to major railway traffic improvement. View full abstract»

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  • Experimental study platform of the automatic transfer switch used to power supplies back-up

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2119 KB) |  | HTML iconHTML  

    This paper presents the practical implementation of an experimental platform used for the automatic transfer switch to the back-up power source. The automatic transfer switch concept represents the procedure of fast connection of the electrical consumers to a back-up electric power source. The connection to the back-up power source is necessary in the event of failure of the main power source. The experimental platform is designed to operate in automatic standard mode, manual mode and through a programmable logic controller. The selection's mode of operation is determined by the operation's key. The simulation of grid faults on the power supply is done by means of the controls and the variable voltage regulators located on the experimental platform. The automatic transfer switch is conditioned by the effective status of the power supply and minimum voltage allowed by devices. The signaling status of the power supply is performed based on the information received from relays of interface and programmable logic controllers. The platform presents to users two technologies able to achieve the same function. Thus, in case of the classic mode of the automatic transfer switch, the wired technology is used and this involves many components and related links. In case of the automatic transfer switch based on programmable logic controller, a technology based on programming is also implemented. Using this platform, the advantage of implementation of programmable logic controllers versus wired technology in industrial applications can be observed. View full abstract»

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  • Elearning dedicated to the students of electrical engineering

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (697 KB) |  | HTML iconHTML  

    With increasing speed Internet developed infrastructure, opportunity for virtual: meetings, training or teambuilding events online. The virtual environments have allowed developing virtual laboratories for study. In these virtual classrooms there experiments can be realized using hardware device or simulate some experiments using different specialized software. Also, students can study theoretical concepts of the application. Clear advantage of online training is their minimum use of resources. View full abstract»

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  • Master of sciences program in medical engineering

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (814 KB) |  | HTML iconHTML  

    Biomedical engineering distinguished itself as an emerging educational domain during the last 15-20 years, stimulated in the contemporary developed societies by the growing need for competitive health care facilities and high quality assistance. Used more and more in modern medicine, high tech equipment is already popular in health care infrastructures and facilities. Interdisciplinary qualified personnel are expected to provide the innovative design, development and maintenance of such equipment and the technical assistance for therapy. A Master of Science program in the field of Medical Engineering started at University “Politehnica” of Bucharest more than ten years ago; it is offered to graduates of engineering, medical sciences, and other scientific tracks (physics, biology, informatics etc.). The main characteristic of the program is interdisciplinarity; education and genuine interprofessional experience are offered in a stimulating interactive academic environment. From the technical perspective, Electrical & Electronic Engineering plays a significant role in the scientific activities spectrum contributing to high performance technical outcomes for new medical technologies and modern equipment. In this paper we highlight the following issues: goals of the educational program, accredited curriculum, available resources, educational methods and professional competence expected from master studies graduates in medical engineering. Several particularities that individualize the educational program from other common master studies and the methods experienced here are also shown. The attraction for candidates and the professional satisfaction are assessed by some statistical data and comments. View full abstract»

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  • On the implementation of the functionalities of smart metering systems

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (173 KB) |  | HTML iconHTML  

    The fast change from the old meters to the modern smart metering systems implies the adoption of new philosophies and new behaviors, both on the side of the electricity consumer and on the side of the energy chain. Real-time information available at a large scale opens new possibilities to manage the electricity consume and losses, to use energy more efficiently, to reduce greenhouse gas emissions and to save money. This is why the implementation of the new smart metering technologies is supported by the European legislation and by the different stakeholders. After a short overview of the smart metering systems, the paper presents the challenges of the smart metering implementation in Romania. The possible benefits and risks resulted from the roll-out report are emphasized. The need of a smart environment is discussed. The elements at the interface with the meter should be “smart” enough to be able to make use of the meter's smartness. On the consumer's side, there is also a problem of acceptance, which makes things more delicate. Consumers need time to learn, understand, accept and use the new facilities. Aiming the maximization of benefits and minimization of risks, the paper suggests a step-by-step implementation of the smart metering functionalities. View full abstract»

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  • Aspects regarding solar battery charge controllers

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (355 KB) |  | HTML iconHTML  

    Recent concerns about environmental issues led to global energy policies oriented to new energy sources less polluting and cheaper. Energy produced by photovoltaic technology is clean and renewable. The actual problem is that currently the price of photovoltaic systems is relatively high. Research in this field is now focused on improving the efficiency of electricity production using photovoltaic technology. For this each component of a photovoltaic system must enroll on this course. Solar battery chargers are an important component of photovoltaic systems that could bring significant efficiency improvements through technology. The paper proposes a study on the types of solar battery chargers from the simplest to the most cutting edge technology, chargers searching for the MPP (maximum power point). An MPPT (Maximum Power Point Tracking) charger plays an important role in photovoltaic systems because it maximizes the power output of the photovoltaic panel array for different levels of irradiation and panel temperature leading to more energy harvested. View full abstract»

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  • About diagnosis of circuit breakers

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (900 KB) |  | HTML iconHTML  

    On-line monitoring of electrical equipment and their diagnosis is a field which has special attention because it can detect some faults in their incipient phase and thus prevent serious failure of the equipment and also prevent financial and materials related losses. This paper presents a system for monitoring and diagnosis of electrical equipment of medium voltage installations. Also are presented the evolutions and values of some parameters considered important for knowledge of technical condition of a circuit breaker, in case of abnormal operating conditions, and comparing them with similar records considered of reference. Advanced processing and data analysis was performed by using a software application developed in LabVIEW programming environment. View full abstract»

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  • Modeling of electric vehicle battery for vehicle-to-grid applications

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (883 KB) |  | HTML iconHTML  

    Electric vehicle battery models are essential when performing analysis of EV systems. The battery package of electric vehicles is complicated and unpredictable because of its chemical based functioning. In this paper, a battery model is presented with a number of internal and external factors taken into account, including temperature, age and wear. View full abstract»

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  • Another method for measuring the density of the liquid in the volume comparator VC1005

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (506 KB) |  | HTML iconHTML  

    The volume comparator type VC1005 is produced by Mettler-Toledo GmbH, Switzerland; this electronic apparatus provide automatic determination of volume and density of solid bodies, using comparative weighing in liquid. The uncertainty of the liquid density affects the accuracy of the measurement in proportion to the volume difference between the weights. The manufacturer specifies two ways of calibrating the liquid density using the software. These ways require manually measurements in air and in liquid with empty / loaded suspension, performed before starting automatic comparisons. In this paper we present another method for measuring the density of the liquid with the volume comparator VC1005. This new method is automatic and is carried out together with measurements performed for the rest of pieces. View full abstract»

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  • 3D finite element analysis of a miniature circuit breaker

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (730 KB) |  | HTML iconHTML  

    In this paper a miniature circuit breaker (MCB) is analyzed using a finite method analysis (FEA) software. Once the 3D model was implemented, a series of simulations were carried out in order to find out the forces that appear inside the electromechanical trip unit and what influences the plunger to trip faster. Also, the influence of the material nonlinearity is emphasized in order to understand the real behavior of the material in a specific applied magnetic field. View full abstract»

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