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View of the PROTECT C. components
2.2 System Description
The UPS is connected 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 digital signal
processor technology and extremely quickly pulsating IGBT
power semiconductors of the inverter guarantee that the