Charger for NiMH/NiCd and LiPo/Li-Ion packs and cells
Battery Charge-n-Check
Published in issue 364, April 2007
Originally developed for receiver batteries in radio-controlled (RC) models, the circuit discussed in this article is used to charge, discharge and evaluate the capacity of battery packs composed of one up to eight NiMH or NiCd cells, or LiPo (Lithium Polymer) or Li-Ion (Lithium-Ion) batteries composed of two elements (serial charge). Model hobbyists, other rechargeable battery users and generally all soldering iron fans will find in the present circuit a low cost, simple solution that’s also easily integrated.
The PCB (050073-1) is currently not available.
main board # 050073-1
Resistors
(SMA case shape 0805 except unless indicated differently)
R1 = 200Ω
R2 = 1kΩ
R3 = 2kΩ2
R4,R10,R21 = 4kΩ7
R5,R25 = 270Ω
R6,R7R12,R13 = 0Ω2 2W (not SMA)
R8 = 200kΩ
R9 = 2kΩ
R11 = 9kΩ1
R14= 8kΩ2
R16,R23 = 1kΩ
R18 = 6kΩ2
R19,R26,R28 = 10kΩ
R20 = 6kΩ8
R22,R27 = 470Ω
R24 = 82Ω
R15 = 2kΩ preset
R17 = 5kΩ preset
Capacitors
C1 = 220µF 16V radial (low profile)
C2,C10,C12 = 100nF
C3,C5 = 2200µF 16V radial (low profile)
C4 = 10nF
C6,C7 = 33pF
C8,C9,C11 = 330nF
C13 = 470nF
C14 à C17 = 22µF 16V
Inductor
L1 = 4µH 5A
Semiconductors
D1 = BAT54
D2 = B520C
D3 = 1N4001
T1 = IRF9Z24N
T2 = BC817-40
T3 = BC807-40
T4,T6,T7,T8,T10 = FDV301N
T5 = IRF640N
T9 = BD138
IC1 = ST7FMC2S4, programmed, order code 050073-41 (SMA device; STMicroelectronics)
IC2 = LM335 (National Semiconductor)
IC3 = M24C02 (SMA device)
IC4 = 78L05
Miscellaneous
X1 = 8MHz quartz crystal
K2 = 2-way SIL pinheader, lead pitch 0.1 inch
K3 = 3-way connector for PC CPU fan
K4 = 14-way boxheader or pinheader
Bz1 = piezo ceramic resonator (buzzer)
Heatsink and fan for T1 & T5
PCB, ref. 050073-1
Display board # 050073-2
Resistors
R1 = 10k Ω potentiometer
R2,R3 = 6kΩ8
Capacitors
C1,C2 = 100nF
Semiconductors
D1 = LED
Miscellaneous
S1-S4 = ‘Digitast’ pushbutton with make contact
K1 = 14-way boxheader or pinheader
K2 = double solder point
LCD1 = general purpose LCD, 2x16 characters
PCB, ref 050073-2
|
Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
|
Books
Password forgotten?
)
