Rack mount Series UPS (1~3kVA) User ‘s Manual
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2.2 Basic Principles
When commercial power is normal, rack mount series UPS input, through PFC,
increases the voltage to ±360V stabilized DC voltage, which supplies DC/AC
inverter and transmits stable 220V AC, while at the same time completing the
charging of the battery. When commercial power is abnormal, the battery
increases the voltage through DC/DC to ± 360V DC voltage and supplies
DC/AC inverter.
UPS principle lock diagram is shown in Fig. 2-7. DC/AC inverter adopts
half-bridge structure, while DC/DC voltage increase adopts push-pull or
BOOST circuit. PFC is active power-factor correction circuit controlled by
UC3854, while CHARGER is complete isolation type charger.
CHARGE
PFC AC/DC
SW
BATTERY
DC/DC
DC/AC
LOAD
220Vac
Fig. 2-7 UPS Basic Principle Block Diagram
2.3 Communication interface
This series UPS has four communication interfaces for choice. Among which
RS232 & dry contact port instruction as below:
Corresponding relations of pins for the RS232 serial ports of this series UPS
and those of general PC as Table 2-1.
162738495
Fig. 2-8 RS232 pins definitions
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