Fluke 45 - Battery Pack Option Functional Block Diagram

45
Service Manual
7-4
TEMP.
COMP.
R15
SWITCHING POWER SUPPLY
CYCLE/FLOAT
CHARGE
RATE SWITCH
1
3
2
S1
LOW BATTERY
DISCONNECT
Q2
BT1
+
_
F1
CR3
TO S1-5 & C27 ON MAIN
CR5
CR4
R21
R22
R20
Feedback path for controlling switching supply output voltage in Float Charge mode.
Feedback path for controlling switching supply output voltage in Cycle Charge mode.
TRICKLE
CHARGER
_
+
J1-6
AC ON
CKT-
J1-5
J1-8
+30V
MAIN
POWER
SUPPLY
J1-10
TO
MICROPROCESSOR
LOW BATTERY
INDICATOR
LINE
RAW
SUPPLY
TO
J1-6
J1-7
5
6
4
OFF ON
S1
T0 MAIN SWITCHING SUPPLY
J1-2
J1-3
OFF
ON
J1-1
CR9
qb33f.eps
Figure 7-1. Battery Pack Option Functional Block Diagram