CONSTRUCTION OF POWER SUPPLY WITH POSITIVE AND NEGATIVE OUTPUT VOLTAGES AND VARIABLE CURRENT OUTPUT

CHAPTER ONE



1.0 INTRODUCTION


A power supply is an electronic device that converts A.C to a lower regulated D.C


output. The primary function of a power supply is to convert electric current form a


source to the correct current, voltage and frequency to power the load. The beauty


of this power supply is that it has various current and voltage outputs that can work


at the same time. Hence, it is known as a multiple power supply.



The project is a low cost power supply that has double positive and negative output


voltages with various values of current: 1A, 2A and 3A. The project uses a step down


transformer connected in parallel with each other in other to produce more current


values. The major part of the circuit that does the rectification is the bridge rectifier.


It  converts  the A.C  to  D.C form therefore  other  things  such  as  electrolytic  and


ceramic capacitors used to be connected to the circuit to make the D.C output pure.


The D.C power supply is a modular power supply used as power source to electronic


equipment and industrial instrumentation, it can also be used as a power pack. The


regulated power supply  provides  short  circuit  protection/over voltage potential in


addition to maintain load voltage regulation. The power supply is termed as fixed


voltage power supply because the voltage present does not vary.



 


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1.1 AIM OF THE PROJECT


The aim of the project is to construct a power supply that is able to charge various


electrical devices within 5 and 12volts with current value of 1-3amps.



 



1.2 OBJECTIVE OF THE PROJECT



The objective of this project is to develop a power conversion system suitable to


produce a multipurpose D.C. power supply.



 



1.3 SCOPE OF THE PROJECT



There are several scope that can be propose for the project:



This project is focus on A.C. to D.C. converter 



The  D.C. power supply circuit is able to convert the fix voltage of 220/240Vac to


desire D.C. volts within 0 to 24V.



1.4 RELEVANCE OF THE PROJECT


This project is to convert high voltage A.C. to low voltage D.C. in order to power


electrical devices of low current values, e.g. computers, phones1.5 




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1.5  LIMITATIONS OF THE PROJECT


It is not able to power above 12V electrical devices. 



It is not able to supply current above 3amps.

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