Now days in Urban and Rural areas we are facing problem of irregular power supply because of that Human beings are facing problem in communication systems.Wi-Fi Router are very popular now a days for internet conection purposes. But they have a major drawback, i.e. they cannot be operated during power failure.
This results in lack of secrecy. UPS is a permanent solution to this problem Or we can say that the main objective of this project to provide regular communication without any interruption in power supply of Wi-Fi Router.
                                                               CHAPTER – 1
Since the UPS is meant only for the cordless telephone, its output power is limited to around 100W. This is sufficient to operate most wi-fi Routers. The UPS presently designed is of on- line type. Here the inverter is ‘on’ through- out, irrespective of the presence of the AC mains. When the AC mains is present, the same is
converted into DC and fed to the inverter. A part of the mains rectified output is used to charge the battery. When the mains power fails, the DC supply to the inverter is from the battery and from this is obtained AC at the inverter output. The circuit wired around IC CD4047 is an astable multivibrator operating at a frequency of 50 Hz. The Q and Q outputs of this multivibrator directly drive power MOSFETS IRF540. The configuration used is push-pull type. The inverter output is filtered and the spikes are reduced using MOV (metal oxide varistor). The inverter transformer used is an ordinary 9V-0-9V, 1.5A mains transformer readily available in the market. Two LEDS (D6 and D7) indicate the presence of mains/battery. The mains supply (when present) is stepped down, rectified and filtered using diodes D1 through D4 and capacitor C1. A part of this supply is also used to charge the battery. In place of a single 12V, 4Ah battery, one may use two 6V, 4Ah batter- ies (SUNCA or any other suitable brand). The circuit can be easily assembled on a general-purpose PCB and placed inside a metal box. The two transformers may be mounted on the chassis of the box. Also, the two batteries can be mounted in the box using supporting clamps. The same circuit can deliver up to 100W, provided the inverter transformer and charging transformer are replaced with higher current rating transformers, so that the system can be used for some other applications as well.
                                                              CHAPTER – 9
                                   CONCLUSION AND FUTURE WORK
Thus we have completed this project successfully with gaining more knowledge of  logical concept in the era of UPS, and it will work as a life tool for households, communication system and societies. This innovative concept will bring revolution in the human daily life.
This project is now looking as finalized product. But still it have more demanding to customize it’s design, working and optimum use of peripheral components. In the future we can increase its power storage capacity and increment in speed of process. After that it can be converted into a final product.

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