hne573 Posted July 14, 2009 Report Share Posted July 14, 2009 Hi,I want to make a battery charger LiIon with a micro controller.I study about Li-Ion battery, charging methods and ...LiIon should be charge with Constant Current/Constant Voltage method.So we should be able to control current and voltage of charger.So I use PWM for controlling these signals.PWM On/Off Fets for charging with determined current and voltageand with ADC we measured the voltage and current.After reading the current and voltage, the duty cycle must be changedif needed(change with PWM).Now I want know, Should be stop the PWM when I want to measure voltageand current?If yes, why? or if no, why?please help me. Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 14, 2009 Report Share Posted July 14, 2009 Why not just use a battery charger IC? Or copy the circuit of a battery charger IC? Quote Link to comment Share on other sites More sharing options...
hne573 Posted July 14, 2009 Author Report Share Posted July 14, 2009 I'm using ATMEGA406 from ATMEL.This micro controller is one of the battery management family withbattery charging and monitoring features.ADCCCADCBattery protectionFET controlCELL balancing and ...I just to know when measurement of voltage or current,the pwm should be stopped?Thanks Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 14, 2009 Report Share Posted July 14, 2009 Simply copy what a battery charger IC does. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted July 15, 2009 Report Share Posted July 15, 2009 It might depend on the the size of the battery. I'm not familiar with a microcontroller based battery charger, but it sounds complicated. I think the concept is very good. But even battery chargers you buy from a store I doubt use microcontrollers. Probably because the cost/benefit does't isn't good. Quote Link to comment Share on other sites More sharing options...
toochi Posted July 25, 2009 Report Share Posted July 25, 2009 my dear your idea of using microcontroller is a welcome one but it will seem so difficult but you can try that of ATMELcontroller that has battery capacity OR TRY THIS AT electronics-tele.blogspot.com Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted July 29, 2009 Report Share Posted July 29, 2009 I'm not good with battery technology, but small batteries that are contantly being used might benefit from an intelligent recharging system. Slow charging, I've always heard, is more desireable than fast charging. Quote Link to comment Share on other sites More sharing options...
FBD38 Posted August 12, 2009 Report Share Posted August 12, 2009 Beware is not properly done, there is serious risks of explosion (see what happen to apple these days).You need also to control the Battery temperature, above 50 Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 12, 2009 Report Share Posted August 12, 2009 I charge 2200mAh Lithium-Ion two-series-cells batteries with a 9V/500mA wall-wart to limit the current to about 500mA and an LM317 voltage regulator set to exactly 8.4V.The wall-wart and LM317 get pretty warm at first then get cold as the battery reaches full charge. The battery does not get warm during charging. It is fully charged in about 5 hours when its current has dropped to almost nothing. Quote Link to comment Share on other sites More sharing options...
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