Phone won't charge
The Li-ion battery cahrging circuitary is some what complex.
For most chargers, the charging procedure is divided into three main phases:
? Pre-charging phase
? Constant-current-charging phase
? Constant-voltage-charging phase
In the Pre-charging phase, it utilizes low charging current to protect the battery. However,in most recharging situations, the charged batteries still have some voltage remaining, so the charger does not need to apply this action, and just passes it on to the next charging phase.
The constant current and voltage charging phases are the main charging phase for
recharging the batteries, where most of the charging energy is transformed into the
battery. The maximum charging current for a battery depends on the battery?s rated
capacity. For example, one battery rated 700 mAh usually can be charged at 350 mAh to
400mA, for faster charging effort.
When the charged battery is Li-Ion, in the last charging procedure, the microcontroller
normally maintains regular charging voltage while monitoring charging current to
determine when the charging procedure should be completed.
When the battery is fully charged, most of the electrical energy is converted to thermal
energy, which can result in high battery temperature. In this case, the temperature
monitoring function will be added for the solution. But since most Li-Ion batteries on the
market also have an over-charging protection function, the temperature detect function is
So it is better to get your phone charging circuitary checked at a local store rather than to make a charger,coz both may cost you almost same.
all the best my friend.
Jul 15, 2007 |
Sony Ericsson K610i Cellular Phone