This document is a project report submitted by students Samarjeet and Sudheer for their Bachelor of Technology degree. It details the design and implementation of a mobile charger circuit and a power charger circuit. The mobile charger uses a 5VA transformer to generate 5V regulated DC power from 220V AC mains to charge mobile phones. The power charger uses a higher rating 12VA transformer to allow faster charging by providing more current. The students learned about electronic components and circuit fabrication through completing this project.

1. A Project Report On
MOBILE CHARGER
&
POWER CHARGER
submitted by
SAMARJEET (1774531003)
SUDHEER (1774531005)
Under the guidance of
Mr. Kartik Goyal
Asst. Professor, Department of Electronics & Communication Engineering
submitted as a partial fulfillment of
award of degree of Bachelor of Technology
in
the year 2018
SHRI RAM MURTI SMARAK COLLEGE OF ENGINEERING AND TECHNOLOGY ,UNNAO
34 Km on Lucknow Kanpur Road, Ashakhera, Lucknow, Uttar Pradesh 209859
Affiliated to Dr. A.P.J. Abdul Kalam Technical University
(Formerly A.K.T.U., Lucknow)

2. CERTIFICATE
Mr. Kartik Goyal,
Asst. Prof., ECE Dept.
SRMS CET, Unnao
This project titled “Mobile Charger” & “ Power Charger” have been carried
out under supervision. The work done was assigned in order to impart the
knowledge of component identification & fabrication. The whole work has been
carried out by the students themselves in the lab of PCB & Electronic
Workshop. This work does not bring any innovativeness but yes it gives an
ample of basic knowledge to the team of Samarjeet & Sudheer who put their all
efforts in completing this project.

3. ACKNOWLEDGMENT
This project was carried out for the purpose that we learn very minute level
basics of electronics. The purpose was served & we are humbly thankful to Mr.
Kartik Goyal, Asst. Professor who put his heart & soul in giving us all the
necessary inputs in carrying out this project. His kind & helping nature made
this project possible.
Further, we are very much thankful to Mr. Sanjay Jaiswal, Lab Staff, ECE Dept.
who was always ready with all extension of all lab resources to us for fulfilling
our requirements.
At last but not the least, we are grateful to Dr. A.K. Srivastava, Principal SRMS
CET who motivated us for carrying out this project.
Samarjeet (1774531003)
Sudheer (1774531005)

4. ABSTRACT
A mobile battery charger circuit is a device that can automatically recharge a mobile
phone’s battery when the power in it gets low. Nowadays mobile phones have become
an integral part of everyone’s life and hence require frequent charging of battery owing
to longer duration usage.
Battery chargers come as simple, trickle, timer based, intelligent, universal battery
charger-analyzers, fast, pulse, inductive, USB based, solar chargers and motion powered
chargers. These battery chargers also vary depending on the applications like mobile
phone charger, battery charger for vehicles, electric vehicle batteries chargers and
charge stations.
Charging methods are classified into two categories: fast charge method and slow
charge method. Fast charge is a system used to recharge a battery in about two hours or
less than this, and the slow charge is a system used to recharge a battery throughout the
night. Slow charging is advantageous as it does not require any charge detection circuit.
Moreover, it is cheap as well. The only drawback of this charging system is that it takes
maximum time to recharge a battery.
Auto-Turn off Battery Charger
The aim of this project is to automatically disconnect a battery from the mains when the
battery gets fully charged. This system can be used to charge partially discharged cells
as well. The circuit is simple and consists of AC-DC converter, relay drivers and charge
stations.

5. Contents
1. Aim of the Project
2. Introduction
3. Block Diagram
4. PCB design
5. Implementation
6. Task Distribution
7. Conclusion

6. OBJECTIVE
The aim of our project is to build a mobile charger that can generate
power from that energy which was previously used to get lost. Our
project is extremely simple but highly useful. This system when
applied on large scale can generate very high amount of power
which can be used for the charge battery.
Also, our objective is set to learn the basic concepts of components,
fabrication, etc. With this project, we want to enhance our skill set of
electronic industry.

7. INTRODUCTION
Mobile phones generally charge with 5V regulated DC supply, so
basically we are going to build a 5V regulated DC supply from 220
AC supply. This will generate a pulsating dc supply which has to be
regulated using IC7805 or IC7812 as per the need of the user.
Generally, mobile chargers are available in market but if we need a
power charger, then again we have to buy a new one. We have
implemented a project in which the same basic charger can work as
a power charger just with the replacement of a transformer.

8. BLOCK DIAGRAM
This shows the basic block diagram of our project. It is divided into three
main block:
1. Generation of power from the piezoelectric material.This is the starting
point of our project,here the power is generated by striking the piezoelectric
keys
2. Rectification of generated AC voltage.As the power generated from the
piezo material is AC is needed to be rectified.
3.Storage of rectified voltage.
Fig. 1 – Basic block diagram of mobile charger

9. CIRCUIT
Fig. 2- Circuit Diagram
Fig. 4- PCB LayoutFig. 3- Designed Transformer

10. IMPLEMENTATION
Circuit employing IC 7805
This circuit was our initial
approach. The rectifier used was
bridge rectifier and IC 7805 was
used to stabalize any ripple in
the left after the bridge rectifier.
Storage capacitor used was 1000
micro farad.
This circuit failed as we did
not considered the less current
generated by piezoelectric
material. Each component has its
own resistance which lead to
drop of current. Due to least
amount of current, it did not
drive into entire circuit.
Fig. 5- Circuit with IC7805
Fig. 6- Complete Circuit

11. POWER CHARGER
Power charger is an advanced charger which facilitates the user to
charge up his/her phone in a quick span of time. The most amused
thing is that all the circuitry of basic charger & power charger is same
except the transformer used to step down 220V supply to a much
lower level.
Power charger has a step down transformer with a rating of 12VA
while the basic charger has a transformer rating of 5VA.
This project initially employed a transformer of 5VA & was working
as a basic charger. After literature survey, we come to know that if we
replace the 5VA transformer with a 12VA transformer, then the same
project will act as a power charger.

12. TASK DISTRIBUTION
Member 1 – Samarjeet – He contributed in field work while
collecting all the required components for the circuit. Later on,
he worked very hard in designing the PCB in the lab.
Member 2 – Sudheer – His task was to do the literature survey
for the understanding the circuit conceptually. Also, he
contributed in designing of various modules of the project like
transformer. Later on, he worked for the report making as all the
content was available with him.

13. CONCLUSION
This project can be used to charge any gadget which supports
rechargable battery. It is not confined to only mobile phones.
Also, we want to conclude that this project helped us in learning the
concepts of basic electronics, component study & conventional
fabrication techniques.