design a dynamic pfi plant for a load with variable power factor ....etc

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Variable Voltage And Variable Frequency drives

Presented By:
P.NATARAJU S.E.V.S.RAGHU VARMA
3rd year E.E.E. 3rd year E.E.E.

Abstract:-
Our varying industrial needs demand more precise control of the outputs of our basic electrical prime movers i.e, THE MOTORS. Basically dc motors are easy to control compared to their ac counter parts, but they have their own limitations with increase in capacity. Conversely ac motors in particular squirrel cage induction motors are very economical but their spee ....etc

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Abstract
This paper presents a simplified sinusoidal uninterruptible power supply (UPS) system. The proposed scheme includes features such as high power factor, low total harmonic distortion and good dynamic response at the ac output voltage. In addition, the scheme has the desirable characteristics of high efficiency, simple circuit and low cost compared with a traditional standalone multiple stages UPS with power factor correction. The paper also presents the circuit operation, the analysis and, experimental results of the proposed UPS sch ....etc

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lm317 12v battery charger

Automatic Battery Charger Circuit Design:

This automatic battery charger circuit design mainly involves two sections power supply section and load comparison section.

The main supply voltage 230V, 50Hz is connected to the primary winding of the center tapped transformer to step down the voltage to 15-0-15V.

The output of the transformer is connected to the Diodes D1, D2. Here diodes D1, D2 are used to convert low AC voltage to pulsating DC voltage. This process is also called as rectification. The pulsating DC vol ....etc

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i need this pdf file can you please make it available for me. thanx ....etc

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....etc

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A New Low Power Test Pattern Generator Using a Variable-Length Ring Counter



1. Introduction
Built-in Self-Test (BIST) is a design-for-test (DFT)
technique in which testing is achieved through built-in
hardware features. The steps in a typical BIST approach are:
(1) on-chip test pattern generation; (2) application of
patterns to the circuit under test (CUT); (3) analysis of CUT
responses via on-chip output response analyzer (ORA) and
(4) making decision whether chip is faulty ....etc

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Variable DC power supply is one of the projects that each student of the electronics should build. Build your own power supply is fun and use it throughout your building projects is the reward of your success. This project uses a transformer to reduce the incoming AC voltage to 12.5V AC.

This circuit is designed for 240VAC input voltage. If 110VAC is necessary, a power transformer 110 / 12.5 should be used. Buck of AC voltage is then rectified by a diode bridge. The rectified DC voltage is smoothed by means of an electrolytic capacitor 2 200uF ....etc

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A variable-speed controller, for an existing 225 kW fixed-speed wind power generator, is presented in this paper. A sensorless direct torque control algorithm-based controller is proposed for the squirrel-cage induction generator. Generator torque reference is derived based on sensorless maximum power tracking mode algorithm, up to the base speed of the generator. A three-phase front-end converter is used here to deliver the generated power to the grid with unity-power-factor operation at all wind speeds. This algorithm is based on direct activ ....etc

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i have ppt of 15 step digital power supply ....etc

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