Xtreme Power Conversion Corporation
G90 Service Manual
Page 15
Uninterruptible Power Supply
Audible Alarm
Battery Mode
Sounding every 5 seconds
Low Battery
Sounding every 2 seconds
Overload
Sounding every second
Fault
Continuously sounding
Circuit principle
Functional diagram
Input
Input Relay(Safety Backfeed Relay)
Boost Relay
Buck Relay
AVR TX
TVSS
EMI/RFI
Input Filter
O/P RLY
com Relay
UPS
output
P1 Relay
Series resonant DC/DC
converter
HF
Battery charger
Battery
Power supply
D2D
controller
Full Bridge
Inverter
CNTL
Fr
on
t p
an
el
EPO
DB9
RS232 (Dry contact optional)
USB
Mini-Slot
USB
MCU
Main Control
MCU
+
-
External battery connector
+
-
HF
Cr
Line interactive UPS
EMI/EFI
Output
Filter
OP CT
INV CT
L
N
G
L
N
G
L
Subsystem instruction
This Otima series UPS system contains two major PCB assemblies. They are including:
1. Power board
Contains major parts of (1) Charger, (2) Auxiliary power supply, (3) DC-DC converter, (4)
Inverter, (5) Output filter.
2. Control board
Contains major parts of protection, signaling circuits, regulation and control circuits of
inverter
The functional diagram shows how the major circuits are connected and illustrates the overall system functions.
The block diagram shows the UPS at normal operation from left to right. this Line-interactive UPS system utilizes
AVR TX to achieve high efficient performance. This UPS can deliver a clean, regulated sine-wave output in case
the input voltage is loss and UPS transfer to battery mode at any load under full load. The sub-systems are
described as below:
800 / 1000 / 1500 / 2000 / 3000/ 5000 VA
