A

PRESENTATION

ON

“DESIGN OF INVERTER”

UNDER THE SUPERVISION OF: PRESENTED BY:

Miss. PUJA SRIVASTAVA PANKAJ CHAUDHARY (24823)

(LECTURER)

DEPARTMENT OF ELECTRICAL & ELECTRONICS ENGINEERING

SANJAY GANDHI INSTITUTE OF ENGINEERING & TECHNOLOGY

NEHRU GRAM BHARATI UNIVERSITY, ALLAHABAD 1

CONTENTS INTRODUCTION

OBJECT OF THE PROJECT

BLOCK DIAGRAM

CIRCUIT DIAGRAM

POWER RATING

INPUT AND OUTPUT VOLTAGES

COMPONENTS

APPLICATION

CLASSIFICATION OF INVERTER

CHARACTERISTICS OF A GOOD INVERTER

BILL OF ENGINEERING MEASUREMENT AND EVALUATION

CONCLUSION

PROJECT SETUP

REFERENCES

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INTRODUCTION

An inverter is a device that changes or inverts direct current (DC) input

to alternating current (AC) output.

It does not "create" or "make" electricity, just changes it from one form

to another. DC input is changed to AC output.

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OBJECT OF THE PROJECT

To adjust power according to load.

To adjust battery charging current according to battery.

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TRANSFORMER-

55

6

12 volts DC

battery Inverter 230 volts AC

BLOCK DIAGRAM

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Inverter

Inverter

DIRECT CURRENTALTERNATING CURRENT

CIRCUIT DIAGRAM

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POWER RATING

Amount of power (watts) an inverter can provide to the

loads-

Continuous Power Rating: Amount of power (watts) an inverter can

continually provide to the loads.

Surge Power Rating: Amount of power (watts) an inverter can

provide to loads for short periods of time.9

INPUT AND OUTPUT VOLTAGES

Input voltage the inverter is designed to accept-

Battery based inverter accept nominal voltage of 12 volts DC.

Output voltage-

Output voltage is usually 230 volts AC.

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COMPONENTS

TRANSFORMER-

A transformer is a device that changes the alternating potential

difference from one value to another value it may be smaller or

greater by using the principle of electromagnetic induction.

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On a step-up transformer there are more turns on the secondary coil

than the primary coil. The induced voltage across the secondary coil is

greater than the applied voltage across the primary coil or in other

words the voltage has been “stepped-up”.

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STEP-UP TRANSFORMER-

MOSFET-

A MOSFET is a voltage controlled majority carrier device. As the name

suggests, movement of majority carriers in a MOSFET is controlled by

the voltage applied on the control electrode (called gate) which is

insulated by a thin metal oxide layer from the bulk semiconductor

body. The electric field produced by the gate voltage modulate the

conductivity of the semiconductor material in the region between the

main current carrying terminals called the Drain (D) and the Source (S).

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RELAY-

A relay may also be called an “electromagnetic switch”.

Relays use a “low amperage circuit” to control a “high amperage

circuit”.

The low amperage circuit controls an electromagnetic device.

The electromagnetic device “closes/opens” the high amperage circuit.

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IC SG3524N-

The SG3524N incorporate all the functions required in the construction

of regulating power supply, inverter, or switching regulator on a single

chip. They also can be used as the control element for high-power-

output applications.

The SG3524N is a fixed-frequency Pulse-width-modulation voltage

regulator control circuit. The regulator operates at a fixed regulator

and frequency to control the circuit. It is programmed by one timing

resistor, RT, and one timing capacitor, CT. 15

APPLICATION

DC Power source utilization

Uninterruptible power supplies

Induction heating

Variable-frequency drives

Electric vehicle drive

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DC POWER SOURCE UTILIZATION-

DC power source utilization applications include use of DC in motor

vehicles and from batteries to power.

UNINTERRUPTIBLE POWER SUPPLY-

An uninterruptible power supply (UPS) uses batteries and an inverter to

supply AC power when main power is not available.

INDUCTION HEATING-

Inverters converts low frequency main AC power to a higher frequency

for used in induction heating.

To do this, AC power is first rectified to provide DC power to high

frequency AC power.

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CLASSIFICATION OF INVERTER

BASED ON CHARGING PROCESS-

Power Inverter- A power inverter converts DC power to stand AC

power.

Solar Inverter- A solar inverter is a type of electrical inverter that is

made to change the direct current electricity from a photovoltaic

array into alternating current.

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CHARACTERISTICS OF A GOOD INVERTER

Its output voltage wave form should be sinusoidal.

Its gain should be high.

Its output voltage and frequency should be controllable in the desired

voltage.

The power required by its controlling circuit should be minimum.

Its overall cost must be minimum.

Its working life must be long.

The semi conductor device used in the inverter should be minimum

switching and conduction losses. 20

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BILL OF ENGINEERING MEASUREMENT AND

EVALUATION

CONCLUSION

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Inverter is a simple but versatile circuit.

It is extensively used as buffer in the output stage to reduce the

loading effect of the previous stage.

The battery backup will improve, not harmful charging and adjusts

power according to its implementations in the inverter.

PROJECT SETUP

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REFERENCES

Ashfaq Husain “Electrical Machine” Second Edition,2012.

Bedford, B.D, Haft, R.G et al. (1964) “ Principle of inverter circuits”

Dr.Ulrich Nicolai, Dr. Tobias Riemann, Prof.Jurgen Petzoldt, Josef Lutz,

“Application manual IGBT and MOSFET power modules”.

Sunil S. Rao.“Switchgear Protection & Power Systems” Eleventh Edition,

2013

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