Xtreme Power Conversion Corporation
M90 & M90L Service Manual
Page 7
Uninterruptible Power Supply
Dimensions (WxHxD)
490 x 130 (3U) x 736.5 mm
Net Weight
34.5 kg
Functional Block
As a true online UPS, the product applies a double conversion topology, comprising functional blocks as shown in
the figure below.
Function Block Diagram
The CONTROL block in the module controls the action of the UPS system. The control board detects the voltage
and current to control PFC and inverter, also they supply the protection for the UPS, when the UPS becomes
abnormal. In most case, the CNTL can provide basic information indicating the status of the UPS.
The CONTROL block in the STS controls the action of Bypass SCR. It works with COMM
board and LCD panel to be user interface as well.
The COMM block provides the communication interface for receiving and executing command from users.
The IPOP and PFC blocks are the input stage of the UPS. The blocks convert AC input power into two stable DC
power stored in the BUS capacitor. In the mean time, PFC (Power Factor Correction) will be executed and allows
input current tracking the input voltage waveform. Therefore, the input power factor will be corrected to 1 to
achieve maximum efficiency and produce lowest power pollution to the utility.
The PFC block in battery mode, also called Booster, is used to convert the low voltage DC
power to higher voltage with stable DC power, stored in the BUS capacitor.
