INTRODUCTIONAt times, power from a wall socket is neither clean noruninterruptible. Many abnormalities such as blackouts,brownouts, spikes, surges, and noise can occur. Underthe best conditions, power interruptions can be aninconvenience. At their worst, they can cause loss ofdata in computer systems or damage to electronicequipment.It is the function of an Uninterruptible Power Supply(UPS) to act as a buffer and provide clean, reliablepower to vulnerable electronic equipment. The basicconcept of a UPS is to store energy during normal