@B.Tech31005 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) CERTIFICATE 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. Mr. Kartik Goyal, Asst. Prof., ECE Dept. SRMS CET, Unnao 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) 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. Contents 1. 2. 3. 4. 5. 6. 7. Aim of the Project Introduction Block Diagram PCB design Implementation Task Distribution Conclusion 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. 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. BLOCK DIAGRAM Fig. 1 – Basic block diagram of mobile charger 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. CIRCUIT Fig. 2- Circuit Diagram Fig. 3- Designed Transformer Fig. 4- PCB Layout 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. Fig. 5- Circuit with IC7805 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. 6- Complete Circuit 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. 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. 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.
