Homemade portable USB mobile charging circuit diagram || Homemade USB rechargeable power bank Circuit diagram
https://things-for-students.blogspot.com/2014/09/homemade-portable-usb-mobile-charging.html
USB chargers are very popular now a day. According to
national survey research with in 2015 year 80% of the mobile phone users will
be smart phone users. As you know most of the smart phone has the facility to
get charge from USB. Sometimes it is hard for us to carry phone charger to
anywhere or sometimes we had to go some place where power cut is the regular
incident or in some part of village there is no power supply. So get rid of
this problem one must have a rechargeable USB power bank. This tutorial will
guide you how to make an USB charger and USB power Bank.
Circuit Diagram of Rechargeable USB Power Bank
Parts required to build USB Power Bank
- 5 1N4007 Diodes
- LM7809 Voltage regulator IC
- LM7805 Voltage regulator IC
- Rechargeable 9V Battery
- USB Cord
- 100uf and 2200uf capacitors
How the USB Power Bank Charger wok?
The Power
Bank circuit can be divided in to three segments for better understanding.
First part of this circuit is AC to DC conversion circuit. Here a step down
transformer and bridge rectifier is used to convert AC 230 volt to DC 12 volt.
To filter the DC voltage a filter circuit has been used.
Second part of
this circuit is to stabilize the voltage and regulate to 9volt and then charge
the battery. Here a diode has been used to block current flow in reverse
direction.
In the last
segment another 5Volt regulator has been used so that it can charge your Smart
phone.
[N.B. Voltage and current are extremely hazardous for health. Familiarize yourself and take safety precautions before working with them]
