Chapter 4 DC to AC Conversion (INVERTER) • General concept • Basic principles/concepts • Single-phase inverter – Square wave – Notching – PWM • Harmonics • Modulation • Three-phase inverter DC to AC Converter (Inverter) • DEFINITION: Converts DC to AC power by switching the DC input voltage (or current) in a pre-determined sequence so as to generate AC voltage (or current) output. • TYPICAL APPLICATIONS: – Un-interruptible power supply (UPS)‚ Industrial (induction motor) drives‚ Traction
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Aero2 Signals & Systems (Part 2) Notes on BJT and transistor circuits Bipolar Junction Transistors • Physical Structure & Symbols • NPN n-type Emitter region p-type Base region n-type Collector region C Collector (C) B E (b) Emitter (E) Emitter-base junction (EBJ) Base (B) (a) Collector-base junction (CBJ) • PNP - similar‚ but: • N- and P-type regions interchanged • Arrow on symbol reversed • Operating Modes Operating mode Cut-off Active Saturation Reverse-active EBJ Reverse
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Fire alarm circuit ABSTRACT Here is a simple fire alarm circuit based on a Light Dependent Resistor (LDR) and lamp pair for sensing the fire. The alarm works by sensing the smoke produced during fire. The circuit produces an audible alarm when the fire breaks out with smoke. When there is no smoke the light from the bulb will be directly falling on the LDR. The LDR resistance will be low and so the voltage across it (below 0.6V). The transistor will be OFF and nothing happens. When there is sufficient
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AC/DC was formed in December‚ 1973‚ in Australia‚ by guitarist Malcolm Young‚ whom had just left his last band‚ Velvet Underground. He saw first hand all the benefits that came with being a rock star‚ as his older brother‚ George Young‚ reach the big time as a member of the popular 1960s band‚ the Easybeats. He very much wanted to follow in George’s footsteps. Malcolm also could see that his younger brother‚ Angus‚ was a very talented guitar player‚ even if he was only 15 years old‚ and picked him
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Laboratory Report Title of Experiment: Series and Parallel Circuits Date Given: January 28‚ 2013 AIM: To investigate the circuits to tell whether the resistors are in parallel or in series also to determine the internal resistance of a 1.5V cell. THEORY: In this experiment it was expected of the experimenter to have a basic knowledge of circuits in both aspects theoretically and practically. A basic circuit comprises of a cell or power supply (some electric driving force) a
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Differentiator and Integrator Circuits Submittal Date: 6/11/2014 Objectives: 1. To demonstrate the operation of a differentiator 2. To demonstrate the operation of an integrator Results: The differentiator circuit caused the cosine wave to output a sine wave and a triangle wave to output a square wave. The Integrator circuit caused the sine wave to become a cosine wave and the square wave into a triangle wave. Conclusions: The differentiator circuit differentiates the wave
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An Investigation on Capacitance and RC circuit Hamdy Hamdy Abdel Moneim Abdou‚ Jaime Lorenzo C. Olivares‚ and Karol Giuseppe A. Jubilo National Institute of Physics‚ University of the Philippines‚ Diliman‚ Quezon City Abstract This experiment is designed to further the understanding of the relationship between voltage‚ charge‚ and capacitance of capacitors. This also explains how values of effective capacitance for series and parallel combinations of capacitors are
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| Resistance and Electric Circuits | Lab 5 | | | The goal of the “Resistance and Electric Circuit” Lab was to determine the resistivity of a conducting wire given two known resistors. The main property of resistivity is that it represents how easily electrons can flow through a material. A Galvanometer is used to measure the current of the circuit and the Wheatstone Bridge is used to measure the resistances and determine the unknown resistance. This experiment also relates Ohm’s Law
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Fifth Edition‚ last update October 18‚ 2006 2 Lessons In Electric Circuits‚ Volume I – DC By Tony R. Kuphaldt Fifth Edition‚ last update October 18‚ 2006 i c 2000-2008‚ Tony R. Kuphaldt This book is published under the terms and conditions of the Design Science License. These terms and conditions allow for free copying‚ distribution‚ and/or modification of this document by the general public. The full Design Science License text is included in the last chapter. As an open and collaboratively
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electronics‚ electrical currents‚ and voltage are used to carry information‚ where as with power electronics‚ they carry power electronics becomes the efficiency An inverter converts DC to AC‚ and also changes voltages. In other words‚ it is a power adopter. It allows a battery – based system to run conversional AC appliances director through conventional home wiring. There are ways to use DC directly‚ but for a modern lifestyle you will need an inverter for the vast majority if not all your loads in
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