I would like to know about the workings of mobile phone battery chargers. I know the basic principle, you take a transformer to bring it down to 9/6/3.7 volts then a bridge rectifier circuit and a capacitor input filter to rectify it into DC. Then you apply it to the battery. But I know this should not be enough, I need at least two things,
- Protection against back current flow
- Switch off power when the battery is fully charged.
Can someone point me to something simple (apart from this http://www.extremecircuits.net/2009/07/mobile-phone-battery-charger-circuit.html)