Hi guys,
i am doing my 4th year..7th sem... garduate degree in Electronics and Communication and am looking to do a good project that will have some practical use. on of the peojects i studied the feasibilty was of a a multi chemistry charger. I read up on the chemistry of batter charging and here are some points. (*)Intended Chemistry (1) NiCd (2) NiMH (3) Li Ion The reason for excluding SLA sealed lead acid is the ratings that i am planning to build for is around 15v tops (+2 differential) and around
2-3 A.(*) Smartness some pretty straight forward chargeing and discharging sampling should allow for chemisty detection but this is currently a stumbling block since there are no experiment data available
(*) Efficieny...plan to get the constat current by PWM switching in a feedback control sytem with uC as intelligentce....should be enough
(*) Cost???... (*) Noise...Swithcing noise will be eliminated using a proper filter.. (*) Battery life...may implement pulse charging to increase life (*) Speed Fast charging with proper EOC...
currenlty the only charger that i could find that indentifies and charges properly is bq2000 Programmable Multi-Chemistry Fast-Charge Management IC a similar thread is "Battery Charger IC's" i plan to improve on any of its trade offs
cost for this is about 1.7 $ per KU but requires external switching supply
dicrete implementaion may not present a cost saving though
currenly i am trying to figure out chemistly identification part.
any suggetions are welcome in any area
any other good projects ideas are also welcome...i have some free time on my hands and dont want to waste it all up on football manager 2005 and Age of conqurors...lol
thank you cafm