Liebert UPSTATION GXT 2U - Manual (Page 9)

5
MAJOR COMPONENTS
T RANSIENT V OLTAGE S URGE S UPPRESSION (TVSS) AND EMI/RFI
F ILTERS
These UPS components provide surge protection and filter both electro-
magnetic interference (EMI) and radio frequency interference (RFI). They
minimize any surges or interference present in the utility line and keep the
sensitive equipment protected.
R
ECTIFIER
/P
OWER
F
ACTOR
C
ORRECTION
(PFC) C
IRCUIT
In normal operation, the rectifier/power factor correction (PFC) circuit con-
verts utility AC power to regulated DC power for use by the inverter while
ensuring that the waveshape of the input current used by the UPS is near
ideal. Extracting this sinewave input current achieves two objectives:
• The utility power is used as efficiently as possible by the UPS
• The amount of distortion reflected on the utility is reduced
This results in cleaner power being available to other devices in the build-
ing not being protected by the UPStation GXT 2U.
I
NVERTER
In normal operation, the inverter utilizes the DC output of the power factor
correction circuit and inverts it into precise, regulated sinewave AC power.
Upon a utility power failure, the inverter receives its required energy from
the battery through the DC to DC converter. In both modes of operation,
the UPS inverter is on-line and continuously generating clean, precise,
regulated AC output power.
Input Output
Inverter
Battery
Battery
Charger
DC to DC
Converter
Rectifier
/PFC
TVSS &
EMI/RFI
Filters
L
N
G
L
N
G
Dynamic
Bypass