LiPo Auto Balancer
Automatic balancing for LiPo battery packs
Materials
Gerber file
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Extra info / Update
• Two LED indicators per cell
• Voltage range 6 to 32 V (6 to 44 V using an LM348n)
• Selectable LiPo pack size from 2s to 5s using jumpers
• Lead-acid cells from 3s to 5s can be balanced
• Balance can be performed on two LiPo packs (up to 5s each)
• 200 mA balancing current (expandable)
• Balancing of cells with 2 Ah to 10 Ah capacity (expandable)
• 2.5 mA quiescent current with 5s and 1 mA with 2s packs
Component list
R1–R5 = 10kOhm 0.1%
R6–R9 = 1.5kOhm
R10–R13 = 1.2Ohm
R14–R17 = 1Ohm
R18 = 8.2kOhm
Capacitors
C1–C4 = 10nF, lead pitch 5mm
C5,C6 = 100nF lead pitch 5mm
Semiconductors
D1–D4 = LED, green, low current, 5mm
D5–D8 = LED, yellow, low current, 5mm
D9 = LED, read, low current, 5mm
D10–D17 = 1N4148
T1–T4 = TIP120
T5–T8 = TIP125
IC1 = LM324, LM348N (see text)
Miscellaneous
K1 = 6-pin SIL pinheader, lead pitch 0.1 in. (2.54mm)
JP2-1–JP4-2 = 4-pin double row pinheader, lead pitch 0.1 in. (2.54mm)
JP5 = 2-pin pinheader, lead pitch 0.1 in. (2.54mm)
14-way IC socket for IC1
10 pcs heatsink isolation set for TO220 style transistor
Aluminium bracket or heatsink
PCB # 090476
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