CHAPTER ONE

1.0 INTRODUCTION

Power bank are portable device comprised of a special circuit that control power flow. They allow the storage of electrical energy (i.e. deposit it into the battery bank) and then later use it to charge any mobile device (i.e. withdrawn it from the battery bank).

Power bank is also called “plug in battery, external battery and charging battery” of the digital products. Its definition is convenient and easy to carry large-capacity portable power. Power bank can simple be define as a power storage/energy reservoir for a secondary cell or a rechargeable battery. It is a third party charger that offers power to your mobile phone when the need arises.

Power banks have become increasingly popular as the battery life of phones, tablets and portable media player is outstripped by the amount of time we spend using them each day. By keeping a battery backup close by, you top up your device(s) while far from a wall outlet. Power banks are good for almost any USB-charged devices. Cameras, MP3 player, mobile phones, tablets etc. as long the power bank is charged. Most commonly power bank will have a dedicated input sockets for receiving power. This power can come from a USB sockets on your computer, but may charge faster when using a wall socket adapter. In most rare occasions , power bank can use the same socket for input and output, but this is rare and should not be assumed of any power bank, as trying to force power into an output can damage the battery.

With the rapid development of global economy, people continued to carry more portable electronic products, as mentioned earlier, which are drained or discharged as a result of longtime uses.

Therefore power bank provides the means of recharging then without the needs of waiting for electric power supply be restored. Power bank are of different size and capacities e.g. 200mAh, 3300mAh, 4600mAh etc.

1.1 SIGNIFICANCE OF THE PROJECT

The power bank is an electronic device which produces electric energy for consumption when charge, it is an external charging battery for mobile phones.

The benefit of these design include;

• Charging of mobile phone when it runs out of battery.
• It is portable, is neither heavy nor inconvenient to carry.
• It has a multiple socket for all kinds of phone.
• It can charge all kinds of phone.
• It can run for several hours and keeps feeding mobile phones.
• The power bank is a very affordable tool.

1.2 AIMS AND OBJECTIVE

This design (Power bank) is an electronic device aimed at achieving the following;

• To construct a power bank that will be able to charge all types of mobile phone devices.
• A device that is capable of supplying 4600mAh current.
• A device with short circuit protection.
• A power bank that as over- charging protection.
• A device that the battery is rechargeable.

1.3 SCOPE AND LIMITATION

This project is the design and construction of 4600mAh power bank for use in residential homes, commercial homes, offices etc, to charge mobile phones.

The limitation of these design is that it can only be used for the charging of mobile phone device and it should not in any case used to charge other high current consumption device such as laptops, car batteries etc.