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15 Jul 2015

IMG_2060

by Robert Gawron @ robertgawron.blogspot.com:

Li-ion cells become more and more popular due to their capacity and reasonable prices. In this entry I will present how to build a simple li-ion battery charger based on MCP73831 chip. It’s a quite useful device for DYI projects,in addition its cost is only around 1,5 euro.

The device uses USB port as a power supply (mini-USB connector). I use the standard gold-pins as an output socket. There’re three of them, but only two are used (looking on the image, counting from top: V+, V-). I will design my li-ion based devices in the same way (same socket, but female), then if I will connect it in the incorrect direction (rotated 180 degrees) they won’t be damaged (V- connected to V-, but V+ connected to n/c pin) – simple way to avoid plugging in an incorrect way.

How to make a USB Li-Ion charger – [Link]

One Response to “How to make a USB Li-Ion charger”

  1. RFgermany Says:

    The nice thing about this chip is that you can have two LEDs on the status pin. You then know how if it is charging and when it is done!
    Like the one I made for direct insertion to the USB:
    https://www.tindie.com/products/RFgermany/liponano-1/

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