Nimh Accumulator Charging Circuit; Fiscal Memory Power Supply Circuits; Power Supply Voltages Characteristics; Fig. 2.6 Nimh Accumulator Charging Circuit - ELCOM Euro-500 Handy Series Service Manual

Euro-500TX Handy

2.1.7 NiMH accumulator charging circuit

The accumulator charging is controlled by the BQ2000 integrated circuit that contains the complete service
and checking of the rapid charging process of the NiMH accumulator. All accumulators are charged using
the constant current of approx. 400 mA and the charging process is finished when the slight drop in accumu-
lator voltage has been detected (a property of the NiMH accumulators when they are fully charged to more
than 0.2 C). The BQ2000 contains also the accumulator temperature protection for safety reasons and the
timer that terminates the charging process if the previous measures should fail.
The connexion with the T4 transistor ensures the total disconnection of accumulators from the other power
source circuits during the charging process so the voltage drop of the fully charged accumulator could be
reliably detected.
Dc1
VIN
VIN
FMKA140
Cc4
1n
1
2
3
BAT 4
Rc6
1k
TEMP

2.1.8 Fiscal memory power supply circuits

Special voltages are needed to program and verify data in the fiscal memory. The circuits shown in the
figure 2.7 produce these voltages.
U15
VH
1
Vin NC
2
Vout Vout
3
R10 Vout Vout
4
Adj NC
220R/F
LM317L
R11
C10
2k/F
100n
R13
100R

2.1.9 Power supply voltages characteristics

VSS primary power supply for the VCC manufacture
values: 8.2 V ± 10 % while mains powered
0 V while accumulator powered
VCC power supply for the logical circuits (logical circuits that are powered all the time)
values: 5 V ± 5 %
12
Service manual
2
Tc
RFP15P05(SFP9Z34) + Cooler
Cc9 Rc13
47u/25V
2k2
Rc12
2k2
Tc1
BC817
Cc5
Rc7
220
4p7
Uc1
8
SNS MOD
7
VSS VCC
6 RC
LED RC
5 TSENS
BAT TS
Cc2
100n
BQ2000
Cc3
100u/10V
VCC2
Rc1
10k
Rc3
TSENS
100k
Rc2
Cc8
22k
1n

Fig. 2.6 NiMH accumulator charging circuit

VCC
D6
T8
SMKA140
BSS84 D18
PV
13,2V
8
7
6
FMKA140
R15
5
R17
100k
T9
RST
100k
C11
BC817
100n
R16
T10
VPP-GEN
100k
BC817

Fig. 2.7 FM power supply circuits

Lc1
Rc14
120uH 0.068
Dc2
Rc5
FMKA140
1k
Tc5
Tc4
BC857
BC857
VCC2
VIN
Rc15
Rc8
22k
4k7
Tc3
MMB3904LT1
VCC2
Dc3
Rc16 Rc17
5V1
6k8 10k
VCC2
Cc1
33n
RC
Rc4
270k
R18
220R/F
VFP
PV
1
2
3
C49
4
1u/35V
R14
22R
© Elcom, s. r. o.
BAT+
Cc7
10u/10V
Rc11
270k (100k)
Rc10
BAT
100k
Rc9
Cc6
47k (22k)
100n
BAT-
VCC
D7
U16
FMKA140
8
Vin NC
7 6,5V VFD
Vout Vout
6
Vout Vout
5
Adj NC
LM317L
C14
C15
R19
1u/35V
1k0/F
100n
D8
FMKA140