UPS as the name suggests means Uninterrupted Power Supply . The function of a UPS is to keep the supply voltage as it is even during power cuts. Let me explain how it works. In side a UPS ( which we use for personal computer) there is a storage cell or battery, an electronic switch, an inverter and a battery charger. Normally, when we start a UPS the main supply is present. The out put line is directly connected to the main supply and the battery is charged if necessary. During power failure, the main supply suddenly goes to zero then the electronic switch which is mainly a power transistor, changes over to the inverter. The inverter turns on immediately and the stored charge in the battery is inverted to get the required A.C. supply. This voltage obtained by the inverter is fed to the load. Circuit Diagram Component Required Parts List for Simple UPS B1- 6V lantern battery C1- 100µF, 16 V DC electrolytic capacitor D1, D2- S...
