2 Theory of Operation Integrated Monitor Theory of Operation
20
Power Supply
Figure 3 Power Supply Architecture
The AC/DC converter transforms the AC power coming from the power plug into 48 V/120W DC
source and isolates the monitoring system from the AC power mains.The 48V is distributed via power
bus and supplies power to all the components of the system: The 56 V DC power needed for the FMS,
MMS and measurement server extension is created by an isolating DC/DC converter. The power
needed for the backlights is converted to 12V DC by the backlight DC/DC converter. The CPU is
supplied with 3.3 V and 5 V DC power. The transformation is performed in two steps: The first DC/
DC converter is a power regulator which reduces the variations caused by load changes on the 48V
power bus. The second DC/DC converter converts the power to the needed voltage. Interface boards
require a power of 10V DC. The HIF board and the LEDs are supplied with 12V DC unregulated
power. The integrated module slot requires a 5 V supply for the modules slots and uses the 48V and
another DC/DC converter to create 60 V in order to supply power for the modules.
CPU Boards
The CPU boards have an MPC860 50 MHz processor that provides a number of on-chip,
configurable interfaces. An array of 12 fast UARTS with configurable protocol options are
implemented in an ASIC (along with other system functions such as independent watchdogs etc.),
providing interfacing capabilities to measurement modules and I/O boards. The serial interfaces can
easily be electrically isolated. The main board contains additional video hardware.
AC/DC
48V /120W
Isolating DC/DC
Converter
Backlight DC/DC Converter
DC/DC
DC/DC
DC/DC Converter
MMS, MMS-EXT
Backlight
CPU
Integrated Module Rack
DC/DC
HIF, LED’s,
wireless
DC Bus
56 V
12 V
12 V
unreg
5 V
3.3 V
I/F boards
5 V
60 V
DC/DC
DC/DC
10 V AC
Front End
Modules
)
FMS
5 V,
60V
Front End
Modules
)
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