|
An uninterruptible power
supply (UPS), also known as an uninterruptible power source or a battery
backup is a device which maintains a continuous supply of
electric power to connected equipment by supplying power from a separate
source when utility power is not available. There are two distinct types of
UPS: off-line and line-interactive (also called on-line).
An off-line UPS remains
idle until a power failure occurs, and then switches from utility power to
its own power source, almost instantaneously. An on-line UPS continuously
powers the protected load from its reserves (usually lead-acid batteries),
while simultaneously replenishing the reserves from the AC power.
The on-line type of
UPS, in addition to providing protection against complete failure of the
utility supply, provides protection against all common power problems, and
for this reason it is also known as a
power conditioner and a line conditioner.
While not limited to
safeguarding any particular type of equipment, a UPS is typically used to
protect
computers,
telecommunication equipment or other electrical equipment where an
unexpected power disruption could cause injuries.
|
