Cell phones good or PC USB charge plug-in direct charge?
-Charge mobile phones, mobile phone recharge, USB charging – IT news Cell phones good or PC USB charge plug-in direct charge?

Mobile phone charging: direct charge vs the computer USB, which is better?

Cell phone lithium battery charging is controlled by IC chips.

Below is a typical cell phone charging process:

To detect the voltage of the battery to be charged, if the voltage is lower than 3V to pre-charge. One-one hundred and first of charge current to set current at this time. Voltage up to 3V, enter the standard charging process. Standard charge process is as follows: to set the constant current charging current, battery voltage up to 4.2V instead of constant voltage charging, keep the charging voltage is 4.2V. At this point, the charging current decreases gradually when currents down to set the charging current of one-tenth, the end of charging (trickle charge after).

Computer USB connector output voltage of 5 v, voltage for charging IC is completely normal, you think USB charging discontent, because USB output current is small, and the final stage of charging, trickle charge State. Theoretically one-five hundredth level for the charge current trickle charge current, 500mA USB standard current (charging IC to determine if it is using the computer USB charger, will limit the charging current), Trickle up is very small, natural long charging time. But the characteristics of lithium-ion batteries for rechargeable, is most afraid of great current charge and cut-off voltage of more than 4.2V, is afraid.

All in all, in theory, use a direct charge or a computer USB charger, and are available to the normal mobile phone charging, only speed differences, does not exist using the computer USB charger discontent saying, if you really met, that can be a problem with the phone itself (for example, ROM and so on), which leads to speed faster than a computer USB charger standby power consumption.