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NAME:ASHUTOSH SRIVASTAVA

ROLL NO.-0806421013

MICROPOWER

ELECTROSTATIC GENERATOR(MEG)

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OUTLINE:

What is Micropower Electrostatic Generator

(MEG)

Basic principle of Operation Circuit Diagram

Comparison with conventional electro static

generator

Application

Research topics

References

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MICROPOWER ELECTROSTATIC

GENERATOR (MEG):

It is a micro machined, vibration-driven

generators employing electrostatic phenomena

to convert the kinetic energy of a mass intoelectrical energy at microwatt level.

They have required mechanical vibrations to

excite a resonant structure.

Micropower electrostatic generators are

capable of powering electronic circuits.

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BASIC PRINCIPLE:

The generator considered

here is of a capacitive type

.

The capacitor is formed by

one electrode which is

weighted and free to move

Second electrode which isstationary relative to the

chip.

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System overview of MEG:

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CIRCUIT DIAGRAM:

Simple circuit

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To initiate a generation cycle, the capacitor is

pre-charged to a low voltage V1.

Accelerating the device causes the weightedelectrode to move against the attractive force

between the electrodes, thereby increasing the

potential energy in the system.

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If the charge q is held constant, the capacitor

voltage increases, and the increase in potential

energy is given by

where V2 is the finishing voltage.

Substituting the standard relationships forparallel plate

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The basis of electrostatic energy conversion is

the variable capacitor. The variable capacitance

structure, is driven by mechanical vibrationsand oscillates between a maximum capacitance

(Cmax) and a minimum capacitance (Cmin).

If the charge on the capacitors constrained, the

voltage will increase as the capacitance

decreases.

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If the voltage across the capacitor is

constrained, charge will move from the

capacitor to a storage device or to the load asthe capacitance decreases.

In either case, mechanical kinetic energy is

converted to electrical energy. When Cv is at

Cmax, switch 1 (SW1) closes, and charge is

transferred from the input to the variable

capacitor.

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Putting the values according to diagram .

Energy obtained by MEG is given by the :

t t

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ompar son w t convent ona

Electrostatic generator

Micro power electrostaticgenerator

Conventional electrostaticgenerator

PRODUCES LOW POWER (

W)

PRODUCES HIGH POWER

(W,kW)

VERY SMALL IN SIZE SIZE IS BULKY

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APPLICATIONS:

As small source of voltage

Low power VLSI design CMOS fabrication

In pacemakers in medical field

In power electronics

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Research Topics:

Self powered signal processing.

Use of piezoelectric force instead of vibration.

Development of an electrostatic generator thatuses the motion of a living body.

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REFERENCE:

Internet

www.wikipedia.com

www.google.com C. B. Williams and R. B. Yates Analysis of a

micro-electric generator for microsystems

S. Meninger, J.O. Mur-Miranda,

R.Amirtharajah, A.P. Chandrakasan, J.H.

Lang, Vibration-to-electric energy conversion,

IEEE Trans.

http://www.wikipedia.com%2Cwww.google.com/http://www.wikipedia.com%2Cwww.google.com/http://www.wikipedia.com%2Cwww.google.com/http://www.wikipedia.com%2Cwww.google.com/http://www.wikipedia.com%2Cwww.google.com/http://www.wikipedia.com%2Cwww.google.com/