6-18-13 Computer strategies and logic Intro to computers The abacus wasn’t electronic but was the first computing device Charles Babbage Mechanical computer developed in 1822 and 1871 w/thousands of moving parts. The Hollerith machine was the first electronically driven machine in the late 1800s Hollerith left the Census bureau in 1896 to establish the Tabulation Machine. Later became IBM The first digital computer built in the basement of Iowa state university in 1937-1942 by John
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Schottky diodes with different voltage and current ratings‚ VJFET‚ and MOSFET samples have been tested to characterize their performance at different temperatures ranging from −50°C to 175°C. Their forward characteristics and switching characteristics in this temperature range are presented. The characteristics of the SiC Schottky diodes are compared with those of a Si pn diode with comparable ratings Keywords: SiC; MOSFET; JFET; Schottky diode. Introduction With the increase in demand
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The University of Nottingham Faculty of Engineering School of Electrical and Electronics Engineering Project Title Supercapacitor/Battery hybrid system for DC motor control pulsed power circuits: Demonstration of Elapsed TIME using Airborne Remote Controlled Helicopters AUTHOR LEE HONG WEE MODERATOR DR. KENNETH ANG SUPERVISOR PROF. SRS PRABAHARAN DATE April 18‚ 2011 Third year project proposal submitted in partial fulfillment of the requirements of the degree of Bachelor
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[pic] [pic] Fig. 1: Buck converter circuit diagram. [pic] [pic] Fig. 2: The two circuit configurations of a buck converter: On-state‚ when the switch is closed‚ and Off-state‚ when the switch is open (Arrows indicate current as the conventional flow model). [pic] [pic] Fig. 3: Naming conventions of the components‚ voltages and current of the buck converter. [pic] [pic] Fig. 4: Evolution of the voltages and currents with time in an ideal buck converter operating in continuous mode. The
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BOGIN‚ JR. - The One‚ Only & Official - * HOME PAGE * ABOUT ME * DISCLAIMER * CONTACT ------------------------------------------------- Top of Form Bottom of Form Flyback driver #2: NE555 quasi-resonant 16. March 2012 This single transistor flyback driver topology was created in response to achieve higher efficiency and higher output voltages from ordinary CRT television flybacks (diode split flybacks)‚ for experiments such as x-rays or ionic lifters‚ without having to
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application INFO available UC1638 UC2638 UC3638 Advanced PWM Motor Controller FEATURES • • • • • • • • Single or Dual Supply Operation Accurate High Speed Oscillator Differential X5 Current Sense Amplifier Bidirectional Pulse-by-Pulse Current Limiting Programmable Oscillator Amplitude and PWM Deadband Dual 500mA Totem Pole Output Drivers Dual 60V‚ 50mA Open Collector Drivers Undervoltage Lockout DESCRIPTION The UC1638 family of integrated circuits are advanced pulse width modulators intended
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DC to AC Inverter Assignment # 2/ Spring 2013 CE721 Ahmad Ghaffari‚ 1203840 Submit Date: Tuesday 19‚ 2013 Abstract DC-AC inverter is a device that converts a direct current (DC) into an alternating current (AC). When there is no AC main power for applications in caravans‚ remote area and etc.‚ this tool is very suitable to use. It mainly converts a DC source (like a car’s battery) to an AC source (230V) to use for power application like
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Efficient Energy Harvester for Microbial Fuel Cells using DC/DC Converters Abstract— Microbial fuel cell (MFC) is an emerging technology for sustainable energy production. An MFC employs indigenous microorganisms as biocatalysts and can theoretically convert any biodegradable substrate into electricity‚ making the technology a viable solution for sustainable waste treatment or autonomous power supply. However‚ the electric energy currently generated from MFCs is not directly usable due to the low
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ABSTRACT Capacitance measurement is of immense importance in the field of electronics. An instrument that measures capacitance to accuracy better than 0.5% has been improvised and rendered auto-ranging by means of an 89c51 circuit. The principle is that of a “direct” or fundamental principle of the time constant of the component. For e.g.‚ the time taken to charge a capacitor to 50% of the applied voltage is given by 0.5 V = V (1- exp (-t/τ) ) The value of t is determined as 0.69314718τ. Knowing
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DEVELOPMENT OF AN INDUCTION COOKER. J. Schedel‚ I. Khan( and E Uken( Naval Engineering Services‚ Cape Technikon( ABSTRACT This paper entails the development of an industrial induction cooker. The induction cookers output power is to be controllable over the full desired operating range. The cooker is also to function with all ferrous vessels. The cooker consists of three main components‚ namely the load‚ the inverter stage and the control stage. This paper also briefly discusses the
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