System Overview
2-9
Power Output
The two channel AC voltages are generated from this board and then apply to the main transformer primary
side and mainframe accordingly.
Grounding Connection
In the PDU board there is an analog ground (AGND), digital ground (DGND) and a protective earth (PE).
Function Implement
The Power distribution Unit (PDU) board is mounted in the workstation and provides the controlled power for
main transformer and mainframe. It is responsible for several main functions as follows.
- Main transformer primary side Inrush Current Suppression
- Mainframe side Inrush Current Suppression
- Normal Mode Voltage Surge Suppression
- Common Mode Voltage Surge Suppression
- Gross over and under voltage lock-out
- Line RMS Voltage Conversion Circuit & Voltage Comparator
- State Detection and Signal Drive Circuit
- The Intelligent Power Control Unit
- UPS control logic
The power on board comes from the output of the start-up transformer and generates the necessary DC
power like +24V, +12V, +10V, +5V, +3.3V.
PJ2
Mainframe
Inrush
Current
Surge
suppression
PJ6
PJ1
Common
Mode
Voltage
Surge
suppression
Normal
Mode
Voltage
Surge
suppression
Primary
Inrush
Current
Surge
suppression
PJ7
PJ13
PJ3
PJ4
PJ5
Interlock
signal
detection
CMPTR
+12V signal
detection
Power
on/off
signal
detection
Intelligent
Power
Control
Unit
PJ8
RMS to DC
Convertion
Voltage
Comparator
Signal Drive
Circuit
PJ10
Mains power
Primary side of main
transformer
Secondary side of
main transformer
Mainframe side
Interlock signal
Computer
+12VDC signal
Power on/off button
WKS on/off ctrl
SIB board
Start up transformer
PJ12
Gross
over/under
voltage lock
J2
J3
200/220/230
/240V jumper
100/110
/120V jumper
24V/24V
+24V/+12V/+10V
/+5V/+3.3V
PJ14
UPS ctrl signal
UPS emergency
button
PE
PJ15
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