Schematic Description; Power Supply Unit; Figure 4.2 Power Supply System - Samsung OfficeServ 12 Service Manual

4.2 Schematic Description

This section provides schematic description on each part of the OfficeServ 12 system.

4.2.1 Power Supply Unit

The PSU(Power Supply Unit) consists of the three main blocks described below:
• Circuit supplying -55 VDC(Volts Direct Current), the system's main power
•
Circuit supplying +5 VDC used for system control and digital power
•
External battery control and interface required for operating the system during a power
failure.
The power supply system of OfficeServ 12 is illustrated below:
F-GND
HOT F1
NEUTRAL
* Input Condition
170 V -270 VAC.
47 -63 Hz
1.6 Arms Max
© SAMSUNG Electronics Co., Ltd.
Main DC
Switching
Line Filter
Power Circuitry
+5VDC
Switching
Power Circuitry
EXT Backup
Battery
Interface

Figure 4.2 Power Supply System

Smoothing
F22
-55 VDC/0.5 A
Circuit
Feedback
Circuitry
Smoothing
+5 VDC/2.2 A
Circuit
Feedback
Circuitry
F21
-54 VDC/0.3 A
BATT+
GND
BATT-
2