System Description - AEG Protect C.3000 Operating Instructions Manual

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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. power outage), 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.