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Uninterruptible Power Supply Overview
Home » Computer Hardware » Uninterruptible Power Supply (UPS) » Uninterruptible Power Supply OverviewThe fundamental purpose of a UPS is to provide an uninterruptible source of power for the equipment it protects. An electric device plugged into the wall or into a surge suppressor plugged into the wall, has only one source of power. If there is a blackout, the electricity is cut and the device obviously goes off immediately. A UPS changes this equation by providing its equipment two sources of power.
UPSs are designed so that there is one source of power that is normally used, called the primary power source, and another source that kicks in if the primary is disrupted, called the secondary power source. The power from the wall is always one of these sources, and the battery contained within the UPS is the other. A switch is used to control which of these sources powers the equipment at any given time. The switch changes from the primary source to the secondary when it detects that the primary power has gone out. It switches back from the secondary power source to the primary when it detects that the primary power source has returned.
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