Specifications

Section-4 Theory
October 17, 2013
4‐12
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004
Figure 4-7 Battery Backup Option Block Diagram
4.3.11 LVPSBoard971‐0051‐011G(Future)
ThelowvoltagepowersupplyforthemodulatorismountedtotheleftinsidewalloftheLPU chassis.Thefollowing
itemsaremountedonthepowersupplyassembly:
• TheACInputconnector.
• A+12Vswitchingpowersupply,mountedtowardstherearofthepowersupplyassembly.
• Provisionforanoptionalbatterybackupboard,mountedatthefrontofthepowersupply
board.
• TheLVPSdistributionboardreceives+12Vdcfromtheswitchingsupply.Itusesitto
generatethe+24Vdc,+5Vdc,and‐12Vdcoutputsfromdctodcconverters.
• The+24V,+12V,+12Vosc,+5V,and‐12Varedcoutputssuppliedviaari bboncabletothe
signalprocessorboard.Powertotheotherboardsisdistributedviathesignalprocessing
boardtotheothersubsystems.
Thebl
ockdiagramofthelowvoltagepowersupplyisshowninFigure4‐8.
Thepa
rtnumberforthepowersupplyboard,includingtheswitchingsupply,is971‐0051‐01 1G.
Figure 4-8 Low Voltage Power Supply Block Diagram
Battery
Charger
Inverter
BT1
4x 1.2V 2.7AH
NI-MH
+12VBATT, J1 - 17,18
+12VBATT Fault, J1 - 13
High = Fault
+12VBATT Fault, J1 - 11
High = Fault
Ground, J1 - 3, 4, 7, 8, 9,
15, 16, 19, 20
PS Mounted, J1 - 10
J1 - 1, 2 +12 V
J1- 5, 6 +5 V
J1 - 12, UPS Off, High = On
J1 - 14, Battery
Charge Enable
16 hrs to Charge
4.8 VBATT
Cr
DC3
DC2
DC1
Ideal
Diode
Qc
+24VM
p
+12VIN
n
Qd
+12VOSC
+24V
+12V
+5V
12V
Qb
Vbat
Qa
DC
12V,0.25A
DC5V
DC612V
+12V,3.5A
DC
DC
+24V,1.2A
DC612V
DC612V
+5V,12A
Timers&
Driver
1Min
32Mins
n
n
DC
Vs
3CellsLiIon
+12V,12.5A
DC
GND
AC2
AC
ACLine
Filter
AC1
10.8Vnom.
1.2AHr
13WHr
20Apk
1.5A
610.8V
DataLine