Abstract “
Solid state control of ac power using diodes, thyristors and triacs injects the harmonics into the ac mains. These injected harmonics cause low efficiency in the supply system, poor power factor and EMI problems. Active filters have been considered a potential candidate to reduce these problems. This paper deals with an active power-filter (APF) based on simple control with optimum selection of energy storage capacitor. A voltage source inverter with hysteresis current control is employed to form the APF, which uses minimum ....etc

[:=Read Full Message Here=:]

Prepared by:
Debashish Mishra




BACKGROUND

The significance of power factor (PF) correction is reflected in the large number of documents addressing this subject, in the engineering design effort, and in the numerous industrial plants that manufacture equipment for the control of reactive power and filtering of current harmonics . Some of the benefits derived from correct PF adjustment are:
1. reduced energy loss;
2. released generation, transmission, distribution, and substation cap ....etc

[:=Read Full Message Here=:]

i need to present a seminar which basically consists of wat is a switched capacitor circuit ,wat it is ,how it works and applications etc ....etc

[:=Read Full Message Here=:]

The switched varactor for high power RF signals is described in this article. This varactor can perform tuneable capacitor operations up to 10 GHz frequencies. The RF micro-electro-mechanical systems (MEMS) has become an atractive area of research in the recent. Devices like tuners, antenna beam forming networks and reconfigurable filters all will benefit from this.

Design principles
In the case of RF MEMS which depend on the electrostatic actuation have a a small air gap in the micrometer range between their movable membrane and ....etc

[:=Read Full Message Here=:]

powerpoint presentation on varactor diode ....etc

[:=Read Full Message Here=:]

Abstract
MEMS varactors are one of the important passive MEMS devices. Their applica- tions include use in VCOs, tunable impedance matching networks, tunable ¯lters, phase shifters, and true time delay lines. The shunt capacitive structure has been employed in most of the conventional MEMS varactor designs because of its simplicity. However, the capacitance ratio of this conventional shunt capacitive MEMS varactor is limited to 1.5 because of the MEMS Pull- In e®ect, which happens when the de°ection between the MEMS top and bottom m ....etc

[:=Read Full Message Here=:]

jhtfjhgfjhgfjhgfjhgfjhgfj
kjhkgjhgkhjgkhj ....etc

[:=Read Full Message Here=:]

Electric Double Layer Capacitors (EDLC)


INTRODUCTION
Electric Double Layer Capacitors (EDLC) are also called super capacitors or ultra capacitors. They store energy in the form of static charges. EDLC resembles the ordinary capacitors but having high energy density. EDLC have very low working voltage ,and are used in hybrid vehicles. EDLC Ëœs are rated from Farads to Kilo Farad ranges
HISTORY & PRESENT
Electric double layer effect was first noticed by General Electric engineers in 1957. B ....etc

[:=Read Full Message Here=:]

I AM BHARGAVI. I AM ENGINEERING FINAL YEAR STUDENT .I NEED THE INFORMATION ABOUT POWER FACTOR CORRECTION USING MULTIPLE CAPACITOR BANKS ....etc

[:=Read Full Message Here=:]

please help me out for this topic ....etc

[:=Read Full Message Here=:]