Article
Extension for LiPo Charger
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The ‘Simple LiPo Charger’ published in Elektor Electronics April 2005 is a small and handy circuit that allows you to quickly charge two or three LiPo cells. Especially in the model construction world are LiPo batteries used a lot these days, particularly model aeroplanes. It is usual to use a series connection of three cells with these models. Since working with these model aeroplanes usually happens in the field, it would be nice if the batteries could be charged from a car battery. We therefore designed a voltage converter for the LiPo charger concerned, which makes it possible to charge three cells in series.
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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PCB
Component list
Resistors:
R1 = 25m (e.g., Digikey # 2FR025-ND)
R2 = 100k
R3 = 10k
Capacitors:
C1,C4,C8 = 100nF
C2,C3 = 47µF 25V radial
C5,C7 = 100µF 25V radial
C6 = 100pF
Semiconductors:
D1 = 31DQ05 (e.g., Digikey # 31DQ05-ND)
IC1 = MAX1771-CPA (e.g., Digikey # MAX1771EPA-ND)
T1 = IRFU3708 (e.g., Digikey # IRFU3708-ND)
Miscellaneous:
K1,K2 = 2-way PCB terminal block, lead pitch 5mm
L1 = 47?H high current suppressor coil, (e.g, Digikey # M9889-ND)
PCB.,ref. 054012-1
R1 = 25m (e.g., Digikey # 2FR025-ND)
R2 = 100k
R3 = 10k
Capacitors:
C1,C4,C8 = 100nF
C2,C3 = 47µF 25V radial
C5,C7 = 100µF 25V radial
C6 = 100pF
Semiconductors:
D1 = 31DQ05 (e.g., Digikey # 31DQ05-ND)
IC1 = MAX1771-CPA (e.g., Digikey # MAX1771EPA-ND)
T1 = IRFU3708 (e.g., Digikey # IRFU3708-ND)
Miscellaneous:
K1,K2 = 2-way PCB terminal block, lead pitch 5mm
L1 = 47?H high current suppressor coil, (e.g, Digikey # M9889-ND)
PCB.,ref. 054012-1
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