9V NiMH charger


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Thread: 9V NiMH charger

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    Join Date
    Jan 2009
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    Default 9V NiMH charger

    I have spare ports (CCP / ADC) on my pic16F913 and i was thinking to use them to charge the NiMH battery (Energizer NH22-175 "9V" / 175mAh) http://data.energizer.com/PDFs/nh22-175.pdf.

    Following the Microchip AN960 (http://ww1.microchip.com/downloads/e...tes/00960a.pdf) and Panasonic (http://http://www.panasonic.com/indu...rgemethods.pdf) i draw the charging flowchart:
    ...see the atachment

    ...so, the battery have to be charged in 3 modes :
    -transition charge current = 44mA
    -fast charge current = 175mA
    -trickle charge current = 8mA

    I found this circuit http://www.angelfire.com/electronic/...es/figure3.gif on the internet but i have hard time to understand it (change it)... please help.

    Thank you.
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