TS_600_00 PW1000 1-3kVA User Manual 6/4/17
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2: General Description
AC/DC Converter
As its name suggests, the AC/DC Converter converts the AC Input supply into a controlled DC supply that is suitable for
use by the inverter. The converter uses a leading-edge switched-mode technique which produces an input power factor of
almost unity over its full operating range (0.99 at full rated linear load) and thereby maximises the UPS efficiency.
The converter can satisfy the inverter DC power demands over an AC Input voltage range of between 110V~300V which
means that the battery is not called upon during power dips (brownouts), thereby maximising battery life and availability.
DC/AC Inverter
The inverter converts the DC voltage connected to its input, from the AC Input supply via the AC/DC converter or from the
battery via the DC/DC converter, and produces a regulated AC Output voltage that is suitable to power the connected load
equipment. The control logic associated with the Inverter power block is substantial, and in addition to the controlling the
output sine wave voltage it also provides various levels of overload protection, frequency regulation and synchronisation,
and output voltage error detection.
Static switch
The static switch provides a means of connecting the UPS AC Output (load) to the inverter output or the bypass line,
which is connected directly to the UPS AC Input. The control logic within this power block will transfer the load to the
bypass supply in the event of overload or UPS (inverter) malfunction. The load can also be transferred between the
inverter and bypass line manually if required. Note that a controlled transfer can take place only if the inverter and bypass
line are synchronised in frequency and phase.
2.2.2 System operating modes
ON-INVERTER operation
Figure 2.2 ON-INVERTER operation
• The battery is being permanently charged by the battery charger.
• The AC/DC converter is processing the AC Input supply and turning it into controlled DC.
• The inverter is converting the AC/DC converter output back into AC suitable for the load.
• The static switch is connecting the inverter output to the UPS AC Output terminals.
EMI
FILTER
EMI
FILTER
AC/DC (PFC)
CONVERTER
DC/AC
INVERTER
STATIC
SWITCH
BATTERY
CHARGER
DC/DC BOOST
CONVERTER
BATTERY
AC
Input
AC
Output
Bypass Line
Safety
Relay
Input
CB
