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Extension for LiPo Charger


Extension for LiPo Charger
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 25m (e.g., Digikey # 2FR025-ND)
R2 = 100k
R3 = 10k
C1,C4,C8 = 100nF
C2,C3 = 47µF 25V radial
C5,C7 = 100µF 25V radial
C6 = 100pF
D1 = 31DQ05 (e.g., Digikey # 31DQ05-ND)
IC1 = MAX1771-CPA (e.g., Digikey # MAX1771EPA-ND)
T1 = IRFU3708 (e.g., Digikey # IRFU3708-ND)
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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