Specifications

14
Types of Uninterruptible Power Supply
(UPS)
On-Line Uninterruptible
Power Supply (VFI)
On this type of UPS, also known as
a double conversion UPS, the
inverter draws its power continuously
from the rectifier (converter). The
current is completely regenerated by
its transformation from AC to DC and
back to AC, guaranteeing a constant
level of quality, regardless of
disturbance on the mains power
source.
By carrying out continuous double
conversion, an On-Line UPS
significantly attenuates electrical
noise, which might otherwise
damage a computer. When the AC
input supply is not within the voltage
and frequency tolerances, the battery
is used to power the inverter. The
inverter continually supplies the
critical load with a true sinewave
current.
If a converter/inverter failure occurs,
the continuity of the load power can
be improved by activating the bypass
source using a transfer switch.
Bypass
A.C. input
Static switch
A.C. output
Battery
A.C. input
Rectifier
Inverter
normal mode battery mode by pass mode