Xtreme Power Conversion Corporation
M90S Service Manual
Page 10
Uninterruptible Power Supply
4.4 Charger
The Charger is to recharge and maintain the batteries at fully charged condition .The charger charges the
batteries with a constant current at initial stage, and as battery voltage keeps increasing, the charge current
decreases accordingly until the charge voltage reached the constant voltage level, and then the charger turns to
the floating charge mode.
The charger employed a double forward topology.
Figure 4.4 charger circuit topology
4.5 EMI Board
Input EMI board is connected between utility and the input of rectifier.
Output EMI board is connected between the output of inverter and output terminal block.
C
Y
C
X
Input
C
Y
Comm on
Choke
C
Y
C
X
Output
C
Y
Figure 4.5 Topology of the EMI
