(1-10kVA) UPS IST3
User Manual
20
2.3 Working Principles
When the mains is normal, the input of (1-10kVA)UPS converts 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 (1-10kVA) UPS is as follows. The DC/AC inverter adopts half bridge
structure and the DC/DC boost adopts the push-pull circuit or boost circuit. PFC is the
correction circuit for active power factor.
The working principle of (1-10kVA) UPS
2.3.1 Working Mode
Mains mode
When the mains works, UPS will work in the mains mode and charge battery.
Mains mode
Bypass mode
UPS works in the bypass mode and charges battery.