UPS
In general , a UPS contains a rechargeable battery and DC to AC convert circuitry . The battery charging circuitry in the UPS will maintain the battery at a full charge during normal operation . If the AC power supply falls low or goes off for any reason , the inverter automatically turns on to maintain the 230 volt AC power supply instantly , no any change UPS output power . Its called UPS .You can continue to work on the computer , either until the UPS battery discharges ,or until the AC power comes back . At the very least ,this will give you enough time to save files and shut down your computer system normally .
HOW TO MAKE A UPS ...........Coming soon .
UPS BLOCK DIAGRAM
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