FSP Technology EP450 series Specifications page 7

2.6 CPU ( MOTOROLA/ MC68HC908JL8CSP)
The Central Process Unit
2.7 Electricity Sw itch
It controls the + 5Vdc and + 12Vdc supplies.
+ 5Vdc and + 12Vdc Control Power Generator.
Provide + 5Vdc (generated from 7805 regulator) and + 12Vdc power supply.
2.8 Charger:
The source for the Charger comes from the mains through the transformer and
full-bridge inverter. The charger is controlled with high frequency technology and
the acceptable charging voltage is 13.6~ 13.9V.
2.9 I nverter Circuit:
The inverter circuit is based on a full-bridge circuitry.
2.10 I nterface Circuit:
The UPS display device contains one LED (or three-LED as option) and one switch.
2.11 Batteries:
Acts as a power supply source while the UPS is on battery mode. Different types
of batteries are used for different models of UPS:
450VA: 12V4.5Ah * 1pc or equal capability
650VA: 12V7Ah * 1 pc or equal capability
850VA: 12V9Ah * 1 pc or equal capability
I/P-N
EMI
I/P-L
Filter
Line
Sense
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Main Relay
Buck Relay
Transformer
Inverter/Charger
Battery
CPU
Figure S-1 Block Diagram
O/P Relay
Boost Relay
O/P / Load
Sense
Rev. A
O/P-N
O/P-L