Hi there,

I am working on a battery-charging algorithm driven by a dsPIC30F3011 16-bit controller. The algorithm is a constant current /constant voltage (CC/CV). Assuming the battery voltage is initially at 10.4 V, it has to be charged to 13.9 V since I am using a lead acid battery. The charging period is called the bulk stage where it charges to 13.9 V and remains there for 1 hour, which is the absorption stage. The battery charging is removed at the start of the absorption stage and at the end of 1 hour, the voltage on the battery dips to 13.7 V which is the float stage.

The current behaves as follows: During initial stag, when V=10.4 V, current is zero. then it rises and attains max. value during bulk stage. at the beginning of the absorption stage, the current starts dropping and attains a constant low during float stage.

How do I implement this as a program? Could you help me oout with an algorithm? How do I configure the timers and ADCs and how many such modules do I use?

Any suggestions from you would be appreciated.

Regards

kautilya

 

While not for a dspic, this should give you a good idea where to start.

http://ww1.microchip.com/downloads/en/AppNotes/30451c.pdf
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en010970