8
EN
PREMIUS
1-10 kVA
2.1.20 Single Input System Block for 1-3 kVA
The above figure illustrates the True On-Line Double Conversion architecture of the UPS system.
The major modules consist of:
1) An AC-to-DC power converter (rectifier) with PFC control circuit
2) A DC-to-AC high frequency inverter
3) An intelligent battery charger
4) A bank of stationary, maintenance-free batteries (external)
5) A DC-to-DC push/pull converter control circuit
6) A static bypass loop
7) Input and output EMI filters
The table below provides a summary of the UPS operating modes under various utility AC power source
and battery conditions.
Utility Condition UPS Operating Mode LEDs
Normal
After the input power is switched on, the LEDs
on the panel will blink and fans will start in
approximately 5 seconds. Press the ON
button for 1-5 seconds. The UPS starts up
normally and Load LEDs remain lit.
Abnormal (under or over
voltage or absent)
Rectifier and charger will not work. Battery
discharges via DC-DC boost circuit and
supplies Inverter. Loads continue to receive
supply from Inverter. Alarm buzzer beeps. UPS
now in battery mode.
LED off, LED illuminated
Utility abnormal or
absent, or battery
voltage low
Rectifier and charger will not work. Battery
discharges via DC-DC boost circuit and
supplies Inverter. Alarm buzzer beeps quickly,
indicating low battery power and Inverter may
stop supplying soon.
LED off, and
LEDs illuminated
EMI FILTER EMI FILTER
AC OUTPUT
BATTERY
SAFETY
RELAY
AC/DC PFC
CONVERTER
DC/AC
INVERTER
BYPASS
RELAY
BATTERY
CHARGER
DC/DC
PUSH PULL
AC INPUT
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