©2021 Lowell Manufacturing Co. UPS9A Series (X-Rev 8/13/20)
Pg. 7
2-2. Operating principle
The operating principle of the UPS is shown as below
The UPS is composed of mains input, EMI/RFI filters, rectifier/PFC, inverter, battery charger, DC-to-DC converter,
battery, dynamic bypass and UPS output.
EMI/RFI
Filters
Battery
Charger
Battery
DC-to-DC
Converter
Inverter
Rectifier
/PFC
nput
I
Output
Dynamic
Bypass