2 Overview
UPS IST7 Series (60K-200K)
User Manual
10
2.2 Work Principle
2.2.1 Work Principle Diagram
AC
DC
DC
AC
DC
DC
UPS
Maintenance bypass
Bypass input
Mains input
Battery input
Bypass unit
Power unit
Output
Figure2-2
Work principle diagram
2.2.2 Work Mode
There are 4 work modes of the UPS: normal mains mode, battery mode, bypass mode and maintenance
bypass mode.
Normal mains mode
When the mains normal, AC power is transformed to DC power by PFC, and supply power for inverter.
While rectifying the AC power into DC power, the rectifier eliminates the abnormal noise wave, noise
and unstable frequency, and make the inverter provide stable and clean power for load. The specific
work process is as follows.
When mains normal, the inverter inside the power unit rectify the mains into anode and cathode DC
voltage. the DC voltage output stable 220Vac voltage to load after it through inverter. When the system
control card detects the inverter normal, it will supply the inverting voltage to load.
Battery mode
When mains abnormal, system will switch to battery input, the Boost circuit promotes the battery
voltage to a certain value and then supply the DC power to the inverter, that makes the AC output
without interruption phenomenon and then protect the load. The specific work process is as follows.
When mains abnormal at any time, the rectifier will switch to battery input immediately to maintain
the voltage of DC electrolysis, which guarantee the inverter without power down. Before battery
discharge completely, if mains recovers, the rectifier will switch to mains input and charge battery at
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