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R&D ā USER MANUAL DT0430-E04
1.3 OPERATING PRINCIPLE
The UPS described here is an on-line dual conversion type UPS with automatic by-pass in compliance with
European standard EN62040-1-2. This UPS performs a dual conversion of the incoming voltage
continuously and without interruption.
The absence of direct connection between mains and the load provides blocking all voltage and frequency
disturbances. The dual conversion guarantees that the output energy is always well regulated and has
correct voltage and frequency values, ideal for the operation of professional applications.
When the input voltage exceeds the allowed range or - more frequently - is not present, the load is supplied
by converted energy from the batteries.
The system is supplied with an automatic by-pass. In the event of a UPS fault or overload, the by-pass
connects immediately the load directly to the mains through a reserve line, making possible normal load
operation without interruption. See fig. 1.3.1
1.3.1. UPS BLOCK DIAGRAM
1.3.2. INPUT STAGE, POWER MODULE AND OUTPUT STAGE
From the input bars the mains are connected via the MAINS INPUT l1 switch to the power module.
The rectifier regulates the DC voltage to a reference value, charging continuously the battery.
Then the DC voltage supplies the inverter, which feeds the load with regulated sinusoidal voltage (phase
and amplitude controlled).
In normal operating conditions, the static switch (providing energy to the load) selects the inverter as the
voltage source; in the case of fault or overload, the UPS output is redirected to the reserve line. This
operation allows providing the energy to the load. When the cause of the alarm disappears, the static
switch automatically selects the inverter to feed the load again.
BATTERIA
I4
I3
=
INGRESSO
RISERVA
RETE
PRINCIPALE
BY-
BY-PASS MANUALE
RETE DI RISERVA
PFC
MODULO
INVERTER
S.SWITCH
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