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3 System Description
i
PROTECT A. is an uninterruptible power supply
(UPS) for essential loads such as personal
computers (PCs) or ISDN telecommunication
equipment and similar devices. It consists of:
♦ Mains filter in the mains input incl. mains energy
backfeed protection
♦ A.V.R. control system
♦ (automatic voltage regulation with mains operation)
♦ Battery charger for charging the battery
♦ Battery as energy storage medium for bridging mains
failures (for supplying the inverter)
♦ Inverter for the supply of connected loads with AC
voltage during mains failures
♦ Static bypass switch for switching over the loads to the
inverter in the case of a mains failure
UPS Block diagram PROTECT A.
The UPS is connected to a shockproof socket between the
public utility's mains and the loads to be protected.
Under normal operating conditions, i.e. if PROTECT A. is
supplied with mains voltage, the battery charger will ensure
that the battery is always completely charged. During this
operating status, the loads connected to PROTECT A. are
supplied with voltage via double mains filters which provide
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