Liebert GXT User Manual download pdf (Page 4)

MAJOR COMPONENTS

TVSS

and

EMI/RFI

Filters

INPUT

Dynamic

Bypass

Rectifier/PFC

Inverter

OUTPUT

DC to DC

Converter

Battery

Charger

TRANSIENT VOLTAGE SURGE SUPPRESSION (TVSS) AND EMI/RFI

FILTERS

These UPS components provide surge protection, and filter both electromagnetic

interference (EMI) and radio frequency interference (RFI). They minimize any

surges or interference present in the utility line and keep the sensitive equipment

protected.

RECTIFIER/POWER FACTOR CORRECTION (PFC) CIRCUIT

In normal operation, the rectifier/power factor correction (PFC) circuit converts

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, and the amount of distortion reflected

on the utility is reduced. This results in cleaner power being available to other

devices in the building not being protected by the UPStation GXT™.

INVERTER

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-DC converter. In both modes of the operation, the UPS

inverter is on-line and continuously generating clean, precise, regulated AC

output power.

BATTERY CHARGER

The battery charger utilizes energy from the utility power and precisely regulates

it to continuously “float” charge the battery system. The battery system charges

whenever the UPStation GXT™ is plugged in.

DC TO DC CONVERTER

The DC-DC converter utilizes energy from the battery system and raises the DC

voltage to the optimum operating voltage for the inverter. This allows the inverter

to operate continuously at its optimum efficiency and voltage, thus increasing

reliability.

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Liebert GXT User Manual Page 4

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