Emerson GXT3-6000RT208 Rectifier/Power Factor Correction PFC Circuit, Inverter, Battery Charger

System Description

2.0SYSTEM DESCRIPTION

Input

L1

L2

N

TVSS &

EMI/RFI

Filters

	Static
	Bypass
Rectifier/PFC
DC-to-DC		Inverter
Converter

Output

L1

L2 N

G

Battery

Battery

Charger

G

2.1Transient 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 util- ity line and keep the sensitive equipment protected.

2.2Rectifier/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.

•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 Liebert® GXT3™.

2.3Inverter

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 oper- ation, the UPS inverter is on-line and continuously generating clean, precise, regulated AC output power.

2.4Battery Charger

The battery charger utilizes energy from the utility power and precisely regulates it to continuously float charge the batteries. The batteries are being charged whenever the Liebert GXT3 is connected to utility power.

2.5DC-to-DC Converter

The DC-to-DC converter utilizes energy from the battery system and raises the DC voltage to the opti- mum operating voltage for the inverter. This allows the inverter to operate continuously at its opti- mum efficiency and voltage, thus increasing reliability.

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