Xtreme Power Conversion Corporation
P91, TX91, TX91L, TXVR Service Manual
Page 7
Uninterruptible Power Supply
3. Functional Block
As a true online UPS, the product applies a double conversion topology, comprising functional blocks as shown in
Figure 3.1
Figure 3.1 Function block Diagram
The CNTL block controls the action of the UPS system. It also provides the communication interface for receiving
and executing command from users via the panel or other communication protocol. When the UPS becomes
abnormal, in most case, the CNTL can provide basic information indicating the status of the UPS.
