3 Three-Phase A.C. Circuits Learning Outcomes This chapter introduces the concepts and principles of the three-phase electrical supply‚ and the corresponding circuits. On completion you should be able to: 1 Describe the reasons for‚ and the generation of the three-phase supply. 2 Distinguish between star (3 and 4-wire) and delta connections. 3 State the relative advantages of three-phase systems compared with single-phase-systems. 4 Solve three-phase circuits in terms of phase and line quantities
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Tracking(locked) ABSTRACT We were assigned to build a phase locked loop frequency synthesiser. The purpose is to help students to gain experience in hardware construction‚ coordinated teamwork and project management. The design uses 74HC4046‚ a PLL integrated circuit (IC) made from CMOS technology A PLL is a closed loop frequency system that locks the phase of an output signal to an input reference signal. The term “lock” refers to a constant or zero phase difference between two signals. The signal from
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Aim : To design an optical data communication network which uses Offset Quadrature Phase Shift Keying modulation technique. oftSware used : Optisystem Components used: 1) Psuedo Random Bit Sequence Generator 2) RZ Pulse Generator 3) Fork 1x2 4) Oscilloscope Visualiser 5) RF Spectrum Analyser 6) OQPSK Modulator 7) Quadrature De-modulator 8) M-ary Threshold Detector 9) Eye Diagram Analyzer 10) PSK Sequence Decoder
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1 A Voltage-Controlled Oscillator (VCO) is a circuit that provides a varying output signal (typically of square-wave or triangular-wave form) whose frequency can be adjusted over a range controlled by a dc voltage. An example of a VCO is the 566 IC unit‚ which contains circuitry to generate both squarewave and triangular-wave signals whose frequency is set by an external resistor and capacitor and then varied by an applied dc voltage. Figure (1) shows that the 566 contains current sources to charge
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Ferroelectric phases and relaxor states in the novel lead-free ( 1 – x ) Bi1/2K1/2TiO3 - x BiScO3 system ( 0 ≤ x ≤ 0.3 ) Leticia Martín-Arias‚ Miguel Algueró and Alicia Castro*. Instituto de Ciencia de Materiales de Madrid‚ CSIC. Cantoblanco‚ 28049 Madrid‚ Spain. acastro@icmm.csic.es * acastro@icmm.csic.es Tel: +34 91 334 9000 Fax: +34 91 372 0623 1 Abstract The novel lead-free Bi-based ferroelectric system with perovskite structure (1 − x) Bi1/2K1/2TiO3 – x BiScO3 was synthesized
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Chapter 10 Phase Transformations in Metals: development of microstructure and alteration of mechanical properties 1. Phase Transformations: a change in the number and/or character of the phases that constitute the microstructure of an alloy *phase: a homogenous portion of a system that has a uniform physical and chemical make up. *Stages of phase transformation 1. Nucleation: the formation of very small particals‚ called nuclei‚ of the new phase‚ which are capable of growing. 2. Growth: The
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International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com Vol. 3‚ Issue 2‚ March -April 2013‚ pp.401-409 Twisted Amplitude Phase Shift Keying ABSTRACT Several modulation techniques are defined in digital modulation‚ Here we are discussing about in four modulation techniques‚8-PSK‚8-TAPSK‚16TAPSK and 16-QAM. In the paper we derive minimum non coherent distance(dnc)of block coded TAPSK and compare it with different modulation techniques‚ i.e. 8-PSK and
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Acetone/Chloroform Liquid-Vapor Phase Diagram Abstract: Liquid-vapor phase of acetone/chloroform was studied through distilling a series of mixtures with different mole fraction. When the mixtures were boiling‚ their vapor was condensed through a water column and collected in a receiving container. Refractive index was collected for starting mixture‚ distillate and residue for each sample. A boiling temperature versus acetone’s mole fraction was constructed to show the liquid-vapor phase diagram. The boiling
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Al-Quds University Faculty of Engineering Electronics and Computer Engineering Master Program Advanced Wireless Communications (8701611) Second Semester 2012/2013 Assignment: Computer Simulation of OFDM System It is required to simulate the performance of OFDM system in Additive White Gaussian Noise (AWGN) channel. Particularly‚ each student should investigate the effect of various parameters such as SNR‚ cyclic prefix/guard interval‚ number of subcarriers M‚ number of
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Design and Implementation of a Single Phase Inverter Circuit 1 INTRODUCTION 1.1 Introduction Inverters are used to produce constant or variable frequency AC output from a DC source. These inverters can be used for AC applicatio n like driving an induction motor. Such type of inverters in present world are used largely in renewable energy systems to convert DC to AC‚ example is a PV system where there is a requirement of such type of inverters which can power AC systems such as an induction
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