WIRELESS BATTERY CHARGING SYSTEM USING RADIO FREQUENCY ENERGY HARVESTING




INTRODUCTION AND MOTIVATION

Cellular telephone technology became commercially available in the 1980’s. Since then, it has been like a snowball rolling downhill, ever increasing in the number of users and the speed at which the technology advances. When the cellular phone was first implemented, it was enormous in size by today’s standards. This reason is two-fold; the battery had ....etc

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Abstract
This seminar describes an approach to harvesting electrical energy from a mechanically excited piezoelectric element. A vibrating piezoelectric device differs from a typical electrical power source in that it has capacitive rather than inductive source impedance, and may be driven by mechanical vibrations of varying amplitude. The harvesting circuit consists of an AC-DC rectifier with an output capacitor, an electrochemical battery, and a switch-mode DC-DC converter that controls the energy flow into the battery. An analytical expre ....etc

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presented by:
Daniel W. Harrist


Abstract

It seems these days that everyone has a cellular phone. Whether yours is for business purposes or personal use, you need an efficient way of charging the battery in the phone. But, like most people, you probably don’t like being tethered to the wall. Imagine a system where your cellular phone battery is always charged. No more worrying about forgetting to charge the battery. Sound Impossible?
It is the focus of this thesis to discuss the first step toward ....etc

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This seminar describes an approach to harvesting electrical energy from a mechanically excited piezoelectric element. A vibrating piezoelectric device differs from a typical electrical power source in that it has a capacitive rather than inductive source impedance, and may be driven by mechanical vibrations of varying amplitude.

An analytical expression for the optimal power flow from a rectified piezoelectric device is derived, and an ?energy harvesting ? circuit is proposed which can achieve this optimal power flow.

The harvesting cir ....etc

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please send me the full information on Adaptive Piezoelectric energy harvesting circuit for seminar purpose. ....etc

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hi
i have downloaded this topic frm the following link

http://studentbank.in/report-Adaptive-Piezoelectric-energy-harvesting-circuit--5382

it is not being opened.
can you please mail me either pdf or ppt or doc of this topic to [email protected] ?

i have sem on monday22.02.10

please reply as soon as possible..

thanking in advance. ....etc

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I. INTRODUCTION
The need for a wireless electrical power supply has spurred an interest in piezoelectric energy harvesting, or the extraction of electrical energy using a vibrating piezoelectric device. Examples of applications that would benefit from such a supply are a capacitively tuned vibration absorber ,a foot-powered radio tag and a Pico Radio .A vibrating piezoelectric device differs from a typical electrical power source in that its internal impedance is capacitive rather than inductive in nature, and that it may ....etc

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ENERGY HARVESTING FROM RADIO WAVES



INTRODUCTION

NECESSITY IS MOTHER OF INVENTION

ENERGY CRISIS NECESSITATED THE INVENTION OF ALTERNATE ENERGY SOURCES


We are being bombarded with energy waves every second of the day.

What if there was a way we could harvest the energy that is being transmitted and use it as a source of power?

If it could be possible to gather the energy and store it, we could potentially use it to power other circuit ....etc

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Introduction
This seminar describes an approach to harvesting electrical energy from a mechanically excited piezoelectric element. A vibrating piezoelectric device differs from a typical electrical power source in that it has a capacitive rather than inductive source impedance, and may be driven by mechanical vibrations of varying amplitude.

An analytical expression for the optimal power flow from a rectified piezoelectric device is derived, and an energy harvesting circuit is proposed which can achieve this optimal power flow. The harves ....etc

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