User's Manual

1.3.2.14 BCPS Block Diagram Theory
Refer to Figure 1-20. The Battery Charger Power Supply (BCPS) monitors various system power levels
and switches the sourced power between the commercial power and batteries to assure continued service.
There are three basic blocks used to illustrate the functions within the BCPS; the Analog Multiplexer, PIC
processor with A/D converter and the DC to DC converter.
48 VDC
Input
48 to 54.2V DC-DC
Converter
54.2 VDC
Battery Input /
Charge Output
Analog Mux
Battery Current
Battery Voltage
AC Volts
AC Current
OB Light Voltage
OB Light Current
+12
-12
VCC
PS Volts
PS Current
HP Volts
LP Volts
PIC
Processor
With A/D
REFERENCE
AC Fail Switch
Battery Backup
Enable
Batt Current Sense
PS Current Sense
RS232 In
~Charger Enable
Low Power (LP) Rack Voltage
Load
Resistor
Fuse
High Power (HP) Rack Voltage
Fuse
Fuse
Battery Test
J4 Connector
~Lamp Test
~Reset
Synch In
Synch Out
RS232 Out
J1 Connector
BCPS Display Outputs
Charger Reset
LEDs
Soft-Start Current-Limiting Resistor
Figure 1-20 BCPS Block Diagram