AEC IST3-J, User Manual

Page: 19 / 37

User Manual UPS IST3-J 2 Overview
13
2.6 Working Principles
When the mains is normal, the input of the UPS is converted into the ±360V steady DC voltage
through PFC, which supplies power for DC/AC inverter to output steady 220V AC and charges
battery at the same time. When the mains is abnormal, the battery will boost into the ±360V
DC voltage for DC/AC inverter through DC/DC.
The working principles of the (1-10kVA) series UPS is as shown in Figure2-8, Figure2-9. The
DC/AC inverter adopts half-bridge structure and the DC/DC boost adopts the quasi push-pull
circuit or boost circuit. PFC is the active power factor correction circuit, CHARGER is
completely isolated charger.
Figure2-8
Work principle of 1-3kVA(L)
Figure2-9
Work principle of 6kVA(L), 10kVA(/B)