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

[:=Read Full Message Here=:]

Variable Power Supp ly withDigital Control
The most frequently used device inelectronic workshops and laboratoriesis a universal power supply provides a variable, fluctuation-free output.Here we present a variable power supplywith digital control that is simple and easyto construct.The circuit is built around an adjustable3-terminal positive-voltage regulatorIC LM317, CMOS decade counter ICCD4017, timer IC NE555 and 3-terminalfixed negative-voltage regulator LM7912.The AC mains supply is stepped downby transformer X1 to deliver a secon..............etc

[:=Read Full Message Here=:]

what is the purpose of lm317 ic in the auto turn off mobile charger ..............etc

[:=Read Full Message Here=:]

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 U..............etc

[:=Read Full Message Here=:]

plz i need variable dc power supply using ic lm317 project report and seminar report on lm317ic..............etc

[:=Read Full Message Here=:]

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 cag..............etc

[:=Read Full Message Here=:]

PIN DIAGRAM OF IC LM317


..............etc

[:=Read Full Message Here=:]

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

[:=Read Full Message Here=:]

A Digital DC Power Supply (programmable bench power supply unit), hardware version 3.0
Abstract:
A good, reliable and easy to use bench power supply unit is probably the most important and most used device in every electronic lab.
A proper electronically stabilized bench power supply unit is an important but also expensive device. Using a microcontroller based design we can build a power supply which has a lot of extra features, is easy to build and very affordable.
The tuxgraphics digital DC power supply..............etc

[:=Read Full Message Here=:]

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

[:=Read Full Message Here=:]