U-Frame Power Supply; Power Controller Board Overview - GE Datex-Ohmeda Aisys Carestation Reference Manual

2.2.1 U-Frame
Power Supply
2.2.2 Power
Controller board
overview
Isolation
Transformer
To
Outlets
5A Fuse
5A Fuse
24V
Figure 2-11 • Power subsystem
M1046983 04/08
The power supply provides a regulated voltage
of approximately 28 VDC input to the Power
Controller board.
The supply has three electrical connections:
• P1 is the 180 VAC inlet,
• P2 is the output to the Power Controller board
of approximately 28 VDC.
• P3 is a four conductor (white wires) that
provides feedback between the U-Frame
Power Supply and the Power Controller
board.
The system uses a distributed power bus. The Power Controller board contains:
• a DC/DC converter that converts the input from the universal power supply to the 12.5
VDC system bus voltage.
The Power Controller contains supervisory circuitry that performs:
• battery charge control (battery switch circuits provide a minimum of 30 minutes of
system power in the event of AC power failure);
• current, voltage, and temperature monitoring;
• AC sensing;
• fan control;
• monitor battery backup.
Two 12-volt batteries, wired in series, provide the back-up power.
The Power Controller communicates with the Display Unit through a RS-422, 9.6 kB
channel. It receives the On/Standby signal from the system switch through the
Anesthesia Control board.
Power Supply
(U-Frame)
AC/DC
SW
SW
Power Fail
Voltage Control
Power Controller Board
Monitor Battery Backup
Auxiliary
Connector Board
SW
Charge
Fan 1
Cntrl
DC/DC
U
A
Microcontroller
R
T
Battery Battery Battery
Temp Switch
2 Theory of Operation
P3
P2
P1
12.5 VDC
On/standby
Mains LED
Fan 2
12.5 VDC
RS-422
RS-422
9.6Kb
Communications
Monitor on/standby
AC
Sense
V/I
2-5