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KTVR KNOWLEDGE PARK FORENGINEERING AND TECHNOLOGY

DESIGN AND FABRICATION OF VARIABLE POWER SUPPLY

&DESIGN AND FABRICATION OF DOMESTIC UPS

Work done by

Preetham kumar.R (110406138016)

Ragunath.R (110406138017)

Rajesh.J (110406138018)

Ramprakash.P (110406138019)

DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

ELECTRONICS DESIGN LABORATORY(080280078)

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CONTENTS

ABSTRACT

OBJECTIVE

INTRODUCTION

BLOCK DIAGRAM CIRCUIT DIAGRAM

DESCRIPTION

SIMULATION DIAGRAM

DESIGN ANALYSIS

CONCLUSION

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ABSTRACT

VARIABLE POWER SUPPLY:

A Variable DC Power Supply is a device that supplies electric supply to

an load and, allows the user to vary or change the DC output voltage

within the specified voltage ranges.

UNINTERRUPTIBLE POWER SUPPLY:

An uninterruptible power supply is also known as UPS or battery thatprovides emergency power to a load. when the input power source, fail

automatically connected to battery.

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OBJECTIVE

VARIABLE POWER SUPPLY:

To design and fabricate a 0-12 volt,1A variable power supply for various

domestic applications at low cost and high reliability

UNINTERRUPTIBLE POWER SUPPLY:

The main objective to design a UPS is to supply continuous undisturbed

and conditioned power to the critical load that energy for powering theload comes from the utility, or from the battery upon mains outage.

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INTRODUCTION

VARIABLE POWER SUPPLY:

This 0- to 12-Vdc variable power supply uses an IC voltage regulator and a heavy

duty transformer to provide a reliable dc power supply.

APPLICATIONS:

Domestic Appliances

Battery Charger

Electronic circuits Small Motor Speed Control

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BLOCK DIAGRAM FOR VARIABLE POWER SUPPLY:

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CIRCUIT DIAGRAM FOR VARIABLE POWER SUPPLY:

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DESCRIPTION

Circuit Description for variable power supplyTRANSFORMER :

Transformers are used in power supplies to isolate the power supply from

the AC voltage source.

RECTIFIER:

The rectifier circuit is the heart of the power supply. Its function is to

convert the incoming AC voltage to a DC voltage.

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Contd

REGULATOR :

A voltage regulator is an electrical regulator designed to automatically

maintain to a constant voltage level.

FILTER:

The smoothing capacitor convert the full-wave rippled Output of the

rectifier into a smooth DC output voltage.

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SIMULATION DIAGRAM OF VARIABLE POWER SUPPLY

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SIMULATION WAVEFORM OF VARIABLE POWER SUPPLY

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DESIGN ANALYSIS :

SL.

NOAPPARATUS

THEORETICAL VALUE

(VOLTS)

PRACTICAL

VALUE(VOLTS)

PEAKVOLTAGE

RMSVOLTAGE

PEAKVOLTAGE

RMSVOLTAGE

1 TRANSFORMER 16.97 12 12.1 8.5

2 RECTIFIER 15.57 11 10.2 7.2

3 CAPACITOR 14.013 9.9 14.2 10

4 REGULATOR 12 14

VARIABLE POWER SUPPLY

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INTRODUCTION

UNINTERRUPTIBLE POWER SUPPLY

To design and fabricate uninterruptible power supply(UPS)

for various domestic applications at low cost and high reliability.

APPLICATION

Frequency discriminators.

Timing circuits.

Time-delay applications. Envelope detection.

Frequency multiplication.

Frequency division.

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BLOCK DIAGRAM FOR UPS

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CIRCUIT DIAGRAM FOR UPS

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DESCRIPTION

Circuit Description for variable power supplyTRANSFORMER :

Transformers are used in power supplies to isolate the power supply from

the AC voltage source.

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REGULATOR :

A voltage regulator is an electrical regulator designed toautomatically maintain to a constant voltage level.

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RECTIFIER

The rectifier circuit is the heart of the power supply. Its function is to convert the

incoming AC voltage to a DC voltage.

In the rectification section, the bridge rectifies the input ac voltage into dc voltage

and the output voltage is given by the formulae:

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Contd

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SIMULATION DIAGRAM OF UPS

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SIMULATION WAVEFORM OF UPS

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DESIGN ANALYSIS

SL.

NO APPARATUS

THEORETICAL VALUE

(VOLTS)

PRACTICAL

VALUE(VOLTS)

PEAKVOLTAGE

RMSVOLTAGE

PEAKVOLTAGE

RMSVOLTAGE

1 Transformer 16.97 12 11 7.8

2 Rectifier 15.57 11 10.2 7.2

3 Regulator 230 158

UNI NTERRUPTI BLE POWER SUPPLY

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CONCLUSION

VARIABLE POWER SUPPLY:

A (0-12v) variable dc power supply is designed by assembling the

required components and thus it is used for varies application. By

making simple alteration and adding few components in this

circuit we attain various fixed voltage.

UNINTERRUPTIBLE POWER SUPPLY:

Now a days as the electronic appliances are so costly, any damage

to it due to the sudden failure in the power supply cannot be

permitted.

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REFERENCES

VARIABLE POWER SUPPLY:

www.circuitdiagram.org

www.next.gr/power-supplies

www.powersupply88.com

www.circuitsstream.blogspot.in

UNINTERRUPTIBLE POWER SUPPLY:

www.circuitsportal.blogspot.com ElectoSuite.com

www.eeweb.com

www.circuitstoday.com

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http://www.next/http://www.circuitsstream.blogspot.in/http://www.circuitsstream.blogspot.in/http://www.next/

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Thank You