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5.
UPS System Block Diagram
Figure 4.1 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
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
Normal
Abnormal (under or
over voltage or
absent)
Utility abnormal or
absent, or battery
voltage low
Figure 4.1
UPS Operating Mode
Working power starts after
approximately 5 seconds, LEDs on the
panel will blink and fans will start. Press
the ON button
UPS starts up normally.
Rectifier and charger stop operating.
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.
Rectifier and charger stop operating.
Battery discharges via DC-DC boost
circuit and supplies Inverter. Alarm
buzzer beeps quickly, indicating battery
power low and Inverter may stop
supplying soon.
for 1-5 seconds. The
33
LEDs
、
、
and
LEDs
remain lit
LED off,
illuminated
LED off,
LEDs illuminated
LED
and
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