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2.2 SYSTEM DESCRIPTION
The UPS is connected between the public network and the power load segment
to be protected.
The rectifier is powered from the mains and converts the AC voltage into a
stabilized DC voltage to feed the inverter. The circuitry technology used (PFC),
enables sinusoidal current consumption, thus allowing a low circuit feedback
operation. A separate, second rectifier (charger) based on switching power supply
technology, recharges or maintains the charge of the battery in the intermediate
circuit. Due to the special circuitry technology used in this charger / rectifier, the
harmonics of the charging current are reduced significantly. Additionally, a sleep
mode considerably increases the service life of the battery. The inverter converts
the DC voltage into a sinusoidal AC voltage. In combination with digital signal
processor technology and extremely high pulse rate IGBT-power semiconductors
in the inverter, a microprocessor-controlled regulator on the basis of pulse-width
modulation (PWM) guarantees a voltage system of the highest quality and
availability on the secured busbar.
Fig. 1: Component diagram