Xtreme Power Conversion Corporation
M90S Service Manual
Page 12
Uninterruptible Power Supply
5.1 PFC board (Power Factor Correct Board)
The PFC board consists of Rectifier and PFC/Booster.
When UPS works in line mode, the Rectifier and PFC will work, It changes the AC power to DC power stored in
the BUS capacitor. When UPS works in Battery mode, the PFC will boost the battery voltage to higher DC BUS
voltage.
Figure 5.1.2 M90S PCF board
5.2 INV board (Inverter Board)
The INV Board includes STS and Inverter. It converts the DC power to a pure sine waveform, in the purpose of
less or no transfer time.
Figure 5.2.3 M90S Inverter Board
