• Chopper Fed Dc Motor
    INTRODUCTION During the nineteenth century, when power supply was dc, dc motors were used extensively to draw power direct from the dc source. The motor speed could be varied by adjusting field current by a rheostat. That was an open loop control. Most of the drives were constant speed...
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  • Seminar
    of the Subway and light rail vehicle is just the low peak operation period of AC network. Fig 1.7 Regenerative Braking Systems The high voltage of AC network leads to high rectified voltage of light rail vehicle’s DC network so that the regenerative braking is difficult to realize in fact. In the...
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  • Microgrid
    and separately run the load, controlled by individual switches [8, 9, 10, 11, 12]. The power quality issues involved during the conversion from dc source to ac for Microgrid operation have become the subject of research. Moreover, the study of intelligent control for Microgrid is also in progress [13,...
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  • Gsm Based Notice Board
    The microcontroller and other devices get power supply from AC to Dc adapter through 7805, 5 volts regulator. The adapter output voltage will be 12V DC non regulated. The 7805/7812 voltage regulators are used to convert 12 V to 5V/12V DC. Vital role of power supply in ‘Remote notice board...
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  • Matrix Converters Dr Pat Wheeler, Dr Jon Clare, Dr Lee Empringham, Mr Maurice Apap and Mr Michael Bland School of Electrical and Electronic Engineering University of Nottingham, Nottingham, Uk Tel. +44 (0) 115 951 5591,
    MATRIX CONVERTERS Dr Pat Wheeler, Dr Jon Clare, Dr Lee Empringham, Mr Maurice Apap and Mr Michael Bland School of Electrical and Electronic Engineering University of Nottingham, Nottingham, UK Tel. +44 (0) 115 951 5591, Fax. +44 (0) 115 951 5616, email. Pat.Wheeler@Nottingham.ac.uk SUMMARY Recently...
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  • A Guide to Battery Charging
    TYPES OF CHARGER 4. PROTECTION 5. REMOTE SENSING 6. POWER FACTOR CORRECTION 7. CE MARKING 8. VOLTS, AMPS and WATTS 9. CHARGER SELECTION 10. DC-DC CONVERTERS 11. INSTALLATION 1. Charging a Battery There are many types of battery but batteries on boats are nearly always LEAD-ACID types similar to...
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  • Power Electronics Basics
    papers are related to power converter topologies. Lakshminarasamma & Ramanarayanan describe the modelling and design of a family of soft transition converters, while Bhardwaj et al discuss reduction of losses and retention of zero voltage switching (ZVS) in a full bridge converter. These papers are mainly...
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  • Dc Power Supply
    Adaptive Control of a Step-Up Full-Bridge DC-DC Converter for Variable Low Input Voltage Applications Elton Pepa Thesis submitted to the faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Master of Science in Electrical...
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  • Machine Tool Spindle
    motors used in spindles • AC motors: Alternating Current motors as the name suggest requires an alternating current. They are usually sized in horsepower. They come with various speed ratings, which are specified as rotations per minute (RPM) at no load condition. As the AC motor is loaded, the speed...
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  • Improvise Dc to Ac Inverter
    Chapter I I. Introduction Power electronics converters can be found wherever there is a need to change voltage, current of frequency of electric power. The power range of these converters is forming some mill watts (as in mobile phone) to thousands of megawatts in an HVDC transmission system. With...
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  • DSp questions
    Open Circuit Test 3.6.2 Short Circuit Test Three-phase Transformers Autotransformers 40 41 41 43 44 4 Concepts of Electrical Machines; DC motors 4.1 Geometry, Fields, Voltages, and Currents 47 47 5 Three-phase Windings 5.1 Current Space Vectors 5.2 Stator Windings and Resulting...
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  • eee interview
    all these. Now a day, magnetic traction is also used for bullet trains. Basically dc motors are used for electric traction systems.   Electrical interview question: How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil? Answer: It's possible by means of Electronic choke...
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  • Boost Rectifier
    Such converters present nonlinear characteristics and an approximation of them are used to drive the models. The most important result obtained is that the small-signal output is not equal to the load impedance. The proposed circuit significantly improves the dynamic response of the converter to load...
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  • improved power quality converters
    CONTROL TECHNIQUES FOR POWER FACTOR CORRECTION CONVERTERS *L. Rossetto, **G. Spiazzi, **P. Tenti *Department of Electrical Engineering **Department of Electronics and Informatics University of Padova, Via Gradenigo 6/a, 35131 Padova - ITALY Phone: +39-49-828.7500 Fax: +39-49-828.7599/7699 Abstract...
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  • Thyristor Switch Application
    26/06/2013 Date of Sub : 17/07/2013 Instructed By : a) DC switch opening and closing by means of a push button. Fig 1: Commutation of Thyristor: A-K voltage Time taken from stopping SR4 to stopping SR3 = 6.2 × 1ms = 6.2ms b) DC switch opening with an over current. Fig 2: Gate voltage...
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  • Large-Scale Pv System Based on the Multiphase Isolated Dc/Dc Converter
    Large-Scale PV System based on the Multiphase Isolated DC/DC converter Hyuntae Choi Wei Zhao Mihai Ciobotaru Vassilios G. Agelidis Australian Energy Research Institute & School of Electrical Engineering and Telecommunications The University of New South Wales Sydney, NSW 2052, Australia hyuntae.choi@student...
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  • Wind Energy
    Conversion System 4.1 Soft Starting with Thyristors 4.2 PWM IGBT Rectifier And Inverter 18-22 4.3 Wind Generation System Description Using PWM IGBT Converters 4.4 STATCOM Chapter 5: Grid Connection Requirements 5.1 Requirements Wind Farm Connections to the Grid 5.2 Reactive Power Control 5.3 Power Control...
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  • Space Vector Model for Nine Switch Inverter
    with low cost, reduced losses and higher efficiency. This paper proposes nine-switch converter with single controller, rather than using 12 switches for operation of drives separately. In electrical vehicle drives mostly AC motors are used. It is because of its well known advantages like simplicity...
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  • Soft-Switching Converter Topology to Obtain High Efficiency
    Partial Resonant Buck-Boost Converter Ashwath Prabhakar, Student, BITS-Pilani Abstract – In this report, a new buck-boost dc/dc converter by soft switching technique has been presented. The switching devices in the converter are operated by soft switching with a new partial resonant circuit. The...
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  • Power Electronics
    turn on (d) None 4.The value of dc load voltage for a 1-( semi converter under continuous conduction mode is (a) Vm/((1+cos() (b) Vm/2((1+cos() (c) Vm/((1-cos() (d) Vm/2((1-cos() 5.For continuous conduction each thyristor pair of a two pulse full converter should conduct for (a)...
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