Full Project – Design and construction of a 18000 mAh power bank

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CHAPTER ONE

1  INTRODUCTION

This chapter gives the background study of the project topic. It also presents the statement of the problem, the objective of the study, its significance as well as the scope and limitation. Furthermore, the chapter presents the method used to achieve the set goal and has the project work organization.

1.1 Background of the Study

A power bank is a portable laptop computer battery charger, or recharger, which is used to put energy into a secondary cell or rechargeable battery of a cell phone by forcing an electric current through it. This device supplies power from its built-in battery through a charging port. Power banks are popular for charging devices when little adjustment is made on it. They can also be used as a power supply for various powered devices such as lights and small fans. They usually recharge with a  power supply. The power bank includes a control circuit that both regulates charging of the battery and converts the battery voltage for the device. Some chargers for cells like 18650s and 26650 can also serve as a power bank. Although it is generally more cumbersome to carry such a charger with cells rather than a conventional power bank, this type of setup has the advantage of being able to charge cells for other uses. It also has the advantage that, when the cells are dead, they can be swapped for fresh cells for immediate use rather than having to be recharged first.

1.2 Problem Statement

Sometimes there is nothing worse than losing all the charges on your cell phone especially when you are in the middle of something very important. Usually this happens at the most inconvenient time probably when you are using your cell phone to surf the web, in the middle of a browsing or when you are desperate to send an important email or text message. Nonetheless, in this dispensation of global village, there is never a good time! If you are always on the move and you never know whether there is power supply in the place you are moving to, the very last thing you would imagine is to have your cell phone low or even empty on battery.  For those who depend largely on their mobile devices, not having enough power for the battery can be a major catastrophe. How else will people reach you or how will you call/text people for business or personal reasons when your cell phone is basically useless as it has gone OFF on you? All these are problems to our present time. To bring this problem to an end, power bank was introduced which is a portable device that can supply power to devices using stored energy in its built-in batteries.

1.3 Aim of the Study

The aim of the project is to construct a 10,000mAh power bank that can be used to recharge small devices, such as cellphones when and where there is no power supply to charge the device from the mains supply.

1.3.1 Objective of the Project

The objective of the project is to design a 10000 mAh power bank device that is used to recharge small devices, such as cellphones when and where there is no power supply to charge the device from mains supply. A connector is added to complete the design. The type of connector will depend on the device to be charged. Cell phones from Samsung and many other companies require the Micro-USB “type B” receptacle connector.

1.4 Significance of the Project

Power bank serve as an ‘extra battery’ or external charger for your phone or other electronic devices. Power bank helps to ensure longer hours of texting, phone calls, or web browsing using your mobile phone.

1.5 Scope of the Project

Cell-phone batteries often die at very inconvenient times, with no ac power outlet nearby. This device uses a 5v regulator (Lm7805), which can be bought almost anywhere, to recharge cell phones and other portable devices like music players, e-book readers, and cameras.

The circuit chargers that typically come with cell phones and other portable devices charge the battery for a brief period of time. Then, they stop, check the voltage, and verify the temperature against an internal table before deciding to stop or continue the charging process. The charging regulation required by the battery is performed within the device getting charged, and this design takes advantage of that circuit.

1.6 Limitation of the Project

1. It can only be recharged with mains supply

The duration of the charge, when in used, depends on the number of cell used.

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Full Project – Design and construction of a 18000 mAh power bank