INTRODUCTION
The
idea behind a UPS (Uninterruptible
Power Supply) is pretty obvious from the name, in addition to filtering,
enhancing or modifying the unity power, special circuit and batteries are used
to prevent electrical machines from losing power during a disruption (blackout
or voltage sag brownout). The units are all called different names depending on
the next design, but all fit into general category of backup power.
Before delving into details of how an
uninterruptible power supply works, let’s take a quick look of the basic of the
type of equipment. An electrical device plugged into the wall or into a surge
suppressor has only one source of power. If there is a blackout, the
electricity is out an the device obviously goes off immediately. A UPS changes this equation by providing its
equipment two source of power.
UPS
are designed so that there is one source of power 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 those sources and the battery contains within the UPS is the other. A switch is used to control each
of these powers and the equipment of any given time. The switch changes from
the primary of the secondary when it detects the primary has gone out. It
switches back from the secondary power the primary power, source has returned.
Contrary to what you might think, the
wall A.C power is not always the primary power source and the battery the
secondary source. Which source is primary and which is secondary depends on the
type of UPS. Therefore, circuit is
provided with this UPS to convert
AC power to DC to change the battery. A device called an invert is also
provided to change the battery stone DC electricity to AC to run your
equipment.
Furthermore, those components of the
uninterruptible power supply and other one discussed in details in the section
covering the various parts of the UPS.
The size of the UPS is primary
dictated by the size of the time your equipment can run on battery power
switching down, higher units not only can power equipment for more time they
can also handle a large total demand for power.
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