A large number of electronic devices, such as cordless telephones, desktop computers, monitors, video surveillance systems, and answering machines, which are found in the home and office do not possess a backup power supply. When power supply is interrupted, these electronic devices are inoperable. An uninterruptible power supply (UPS) is a type of power supply used to power and protect an electrical load that is sensitive to fluctuations in or the absence of electrical power.
An uninterruptible power supply is typically used as a buffer between commercially supplied power and an electrical load, such as a computer, that requires precise or uninterrupted power. A UPS serves to keep a computer operating by supplying power thereto when the power supply from the commercial power is stopped, for example, a power failure or breaker trip due to overload occurs. An uninterruptible power supply uses an inverter to convert a direct current (DC) from a battery into an alternating current (AC).The UPS uses the commercially supplied AC power to charge a DC battery. A UPS generally comprises a rectifier, inverter, battery charger, DC battery, and other components, all housed within a single case or package.
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