Circuit - +5v Powered Charge Pump Battery Charger - Circuits designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 12, 2010 12:08 PM

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Charge Pump Circuits

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+5v Powered Charge Pump Battery Charger February 7, 2010
The circuit below will trickle charge a four cell pack of AA or AAA NiMH batteries. The circuit draws current from the +5v available a USB connection and pumps about 70ma of current into the battery. This should be enough current to fully charge a pack of 2500ma-hour cells in about 36 hours. The circuit uses a single 74HC14 hex Schmitt trigger inverter in conjunction with a voltage doubler charge pump circuit.

Click on Drawing Below to view PDF version of Schematic

Master Schematic Category List - David A. Johnson, P.E.
Charge Pump Circuits