AEG PROTECT C. 1000 (S) Betriebsanleitung PDF herunterladen (Seite 8)

2.2 System Description

The UPS is connected to a shockproof socket between the

public utility's mains and the loads to be protected.

The power section of the rectifier converts the mains voltage

to DC voltage for supplying the inverter. The circuit

technology used (PFC) enables sinusoidal current

consumption and therefore operation with little system

disturbance. A separate, second rectifier (charging REC set

up using switch mode power supply technology) is

responsible for charging or trickle-charging the battery

connected in the intermediate circuit. The configuration of this

charging REC means the harmonic content of the charging

current for the battery is almost zero, so the service life of the

battery is increased even more. The inverter is responsible for

converting the DC voltage into a sinusoidal output voltage. A

microprocessor-controlled control system based on pulse-

width modulation (PWM) in conjunction with an extremely

quickly pulsating IGBT power semiconductors of the inverter

guarantee that the voltage system on the protected busbar is

of the highest quality and availability.

In the event of mains faults (e.g. current failures), the voltage

continues to be supplied from the inverter to the load without

any interruption. From this point onwards, the inverter draws

its power from the battery instead of the rectifier. No switching

operations are necessary; this means there is no interruption

in the supply to the load.

For safety reasons (as required by German standards, VDE),

the mains input in the unit will be disconnected by a two-pole

switch in the event of a mains failure. Energy backfeed to the

mains and voltage supply to the pins of the mains connector

are thus reliably avoided.

The automatic bypass serves to increase the reliability of the

supply further. It switches the public mains directly through to

the load if there is an inverter malfunction. As a result, the

automatic bypass represents an extra passive redundancy for

the load.

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AEG PROTECT C. 1000 (S) Betriebsanleitung Seite 8