POWER SUPPLY CIRCUIT
The power supply circuit consists of 4 blocks which are Primary circuit, 5 V circuit, 3 V circuit and 25 V
circuit as follows;
To Secondary Detector (V5MAIN)
5 V circuit5 V system
Fuse
AlkalinePrimaryTo Secondary Detector (V3MAIN)
circuit
3 V circuit3 V system
To Detector (RBATMAIN)
NiMH
AC Adaptor
25 V circuit25 V system
To Primary Detector (VBAT2)
To Detector (VSUB)
To Primary Detector (RBATCHG)
Lithium
Primary Circuit
The voltage from both batteries, alkaline and NiMH, supplies to V5 and V3 circuits through the fuse when
the battery is loaded.
The VBAT2 and RBATCHG are for the reference voltage for Primary detectors. VBAT2 is for alkaline
batteries detector. RBATCHG is for NiMH detector.
RBATMAIN is for AC adaptor detector. It detects whether AC adaptor is used or not.
VDETDRB is to prevent overdischarge of NiMH. When the unit turns off automatically caused by low bat-
tery of NiMH, VDETDRB from detector is H. Then Q54 turns off, it makes the GND line for NiMH cut.
VBAT2 (to Detector)
Fuse
To V3 and V5 circuits.
FS1
Q53
AlkalineNiMH
D15
(1.6 ~ 3.4 V)(1.9 ~ 2.8 V)
Q54
VDETDRB (Normally H)
ChargerRBATCHG (to Detector)
AC AdaptorRBATMAIN (to Detector)
N 34 N |
ACEC
